Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 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" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
96d7229d LM |
24 | #include "nat/linux-nat.h" |
25 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 26 | #include "gdb_wait.h" |
da6d8c04 | 27 | #include <sys/ptrace.h> |
125f8a3d GB |
28 | #include "nat/linux-ptrace.h" |
29 | #include "nat/linux-procfs.h" | |
8cc73a39 | 30 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
31 | #include <signal.h> |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
0a30fbc4 | 34 | #include <unistd.h> |
fd500816 | 35 | #include <sys/syscall.h> |
f9387fc3 | 36 | #include <sched.h> |
07e059b5 VP |
37 | #include <ctype.h> |
38 | #include <pwd.h> | |
39 | #include <sys/types.h> | |
40 | #include <dirent.h> | |
53ce3c39 | 41 | #include <sys/stat.h> |
efcbbd14 | 42 | #include <sys/vfs.h> |
1570b33e | 43 | #include <sys/uio.h> |
602e3198 | 44 | #include "filestuff.h" |
c144c7a0 | 45 | #include "tracepoint.h" |
533b0600 | 46 | #include "hostio.h" |
957f3f49 DE |
47 | #ifndef ELFMAG0 |
48 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
49 | then ELFMAG0 will have been defined. If it didn't get included by | |
50 | gdb_proc_service.h then including it will likely introduce a duplicate | |
51 | definition of elf_fpregset_t. */ | |
52 | #include <elf.h> | |
53 | #endif | |
efcbbd14 UW |
54 | |
55 | #ifndef SPUFS_MAGIC | |
56 | #define SPUFS_MAGIC 0x23c9b64e | |
57 | #endif | |
da6d8c04 | 58 | |
03583c20 UW |
59 | #ifdef HAVE_PERSONALITY |
60 | # include <sys/personality.h> | |
61 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
62 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
63 | # endif | |
64 | #endif | |
65 | ||
fd462a61 DJ |
66 | #ifndef O_LARGEFILE |
67 | #define O_LARGEFILE 0 | |
68 | #endif | |
69 | ||
ec8ebe72 DE |
70 | #ifndef W_STOPCODE |
71 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
72 | #endif | |
73 | ||
1a981360 PA |
74 | /* This is the kernel's hard limit. Not to be confused with |
75 | SIGRTMIN. */ | |
76 | #ifndef __SIGRTMIN | |
77 | #define __SIGRTMIN 32 | |
78 | #endif | |
79 | ||
db0dfaa0 LM |
80 | /* Some targets did not define these ptrace constants from the start, |
81 | so gdbserver defines them locally here. In the future, these may | |
82 | be removed after they are added to asm/ptrace.h. */ | |
83 | #if !(defined(PT_TEXT_ADDR) \ | |
84 | || defined(PT_DATA_ADDR) \ | |
85 | || defined(PT_TEXT_END_ADDR)) | |
86 | #if defined(__mcoldfire__) | |
87 | /* These are still undefined in 3.10 kernels. */ | |
88 | #define PT_TEXT_ADDR 49*4 | |
89 | #define PT_DATA_ADDR 50*4 | |
90 | #define PT_TEXT_END_ADDR 51*4 | |
91 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
92 | #elif defined(BFIN) | |
93 | #define PT_TEXT_ADDR 220 | |
94 | #define PT_TEXT_END_ADDR 224 | |
95 | #define PT_DATA_ADDR 228 | |
96 | /* These are still undefined in 3.10 kernels. */ | |
97 | #elif defined(__TMS320C6X__) | |
98 | #define PT_TEXT_ADDR (0x10000*4) | |
99 | #define PT_DATA_ADDR (0x10004*4) | |
100 | #define PT_TEXT_END_ADDR (0x10008*4) | |
101 | #endif | |
102 | #endif | |
103 | ||
9accd112 | 104 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 105 | # include "nat/linux-btrace.h" |
9accd112 MM |
106 | #endif |
107 | ||
8365dcf5 TJB |
108 | #ifndef HAVE_ELF32_AUXV_T |
109 | /* Copied from glibc's elf.h. */ | |
110 | typedef struct | |
111 | { | |
112 | uint32_t a_type; /* Entry type */ | |
113 | union | |
114 | { | |
115 | uint32_t a_val; /* Integer value */ | |
116 | /* We use to have pointer elements added here. We cannot do that, | |
117 | though, since it does not work when using 32-bit definitions | |
118 | on 64-bit platforms and vice versa. */ | |
119 | } a_un; | |
120 | } Elf32_auxv_t; | |
121 | #endif | |
122 | ||
123 | #ifndef HAVE_ELF64_AUXV_T | |
124 | /* Copied from glibc's elf.h. */ | |
125 | typedef struct | |
126 | { | |
127 | uint64_t a_type; /* Entry type */ | |
128 | union | |
129 | { | |
130 | uint64_t a_val; /* Integer value */ | |
131 | /* We use to have pointer elements added here. We cannot do that, | |
132 | though, since it does not work when using 32-bit definitions | |
133 | on 64-bit platforms and vice versa. */ | |
134 | } a_un; | |
135 | } Elf64_auxv_t; | |
136 | #endif | |
137 | ||
05044653 PA |
138 | /* A list of all unknown processes which receive stop signals. Some |
139 | other process will presumably claim each of these as forked | |
140 | children momentarily. */ | |
24a09b5f | 141 | |
05044653 PA |
142 | struct simple_pid_list |
143 | { | |
144 | /* The process ID. */ | |
145 | int pid; | |
146 | ||
147 | /* The status as reported by waitpid. */ | |
148 | int status; | |
149 | ||
150 | /* Next in chain. */ | |
151 | struct simple_pid_list *next; | |
152 | }; | |
153 | struct simple_pid_list *stopped_pids; | |
154 | ||
155 | /* Trivial list manipulation functions to keep track of a list of new | |
156 | stopped processes. */ | |
157 | ||
158 | static void | |
159 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
160 | { | |
161 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
162 | ||
163 | new_pid->pid = pid; | |
164 | new_pid->status = status; | |
165 | new_pid->next = *listp; | |
166 | *listp = new_pid; | |
167 | } | |
168 | ||
169 | static int | |
170 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
171 | { | |
172 | struct simple_pid_list **p; | |
173 | ||
174 | for (p = listp; *p != NULL; p = &(*p)->next) | |
175 | if ((*p)->pid == pid) | |
176 | { | |
177 | struct simple_pid_list *next = (*p)->next; | |
178 | ||
179 | *statusp = (*p)->status; | |
180 | xfree (*p); | |
181 | *p = next; | |
182 | return 1; | |
183 | } | |
184 | return 0; | |
185 | } | |
24a09b5f | 186 | |
bde24c0a PA |
187 | enum stopping_threads_kind |
188 | { | |
189 | /* Not stopping threads presently. */ | |
190 | NOT_STOPPING_THREADS, | |
191 | ||
192 | /* Stopping threads. */ | |
193 | STOPPING_THREADS, | |
194 | ||
195 | /* Stopping and suspending threads. */ | |
196 | STOPPING_AND_SUSPENDING_THREADS | |
197 | }; | |
198 | ||
199 | /* This is set while stop_all_lwps is in effect. */ | |
200 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
201 | |
202 | /* FIXME make into a target method? */ | |
24a09b5f | 203 | int using_threads = 1; |
24a09b5f | 204 | |
fa593d66 PA |
205 | /* True if we're presently stabilizing threads (moving them out of |
206 | jump pads). */ | |
207 | static int stabilizing_threads; | |
208 | ||
2acc282a | 209 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 210 | int step, int signal, siginfo_t *info); |
2bd7c093 | 211 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
212 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
213 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
214 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
215 | int *wstat, int options); | |
95954743 | 216 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 217 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 218 | static int linux_stopped_by_watchpoint (void); |
95954743 | 219 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 220 | static void proceed_all_lwps (void); |
d50171e4 | 221 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
222 | static int kill_lwp (unsigned long lwpid, int signo); |
223 | ||
582511be PA |
224 | /* When the event-loop is doing a step-over, this points at the thread |
225 | being stepped. */ | |
226 | ptid_t step_over_bkpt; | |
227 | ||
d50171e4 PA |
228 | /* True if the low target can hardware single-step. Such targets |
229 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
230 | ||
231 | static int | |
232 | can_hardware_single_step (void) | |
233 | { | |
234 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
235 | } | |
236 | ||
237 | /* True if the low target supports memory breakpoints. If so, we'll | |
238 | have a GET_PC implementation. */ | |
239 | ||
240 | static int | |
241 | supports_breakpoints (void) | |
242 | { | |
243 | return (the_low_target.get_pc != NULL); | |
244 | } | |
0d62e5e8 | 245 | |
fa593d66 PA |
246 | /* Returns true if this target can support fast tracepoints. This |
247 | does not mean that the in-process agent has been loaded in the | |
248 | inferior. */ | |
249 | ||
250 | static int | |
251 | supports_fast_tracepoints (void) | |
252 | { | |
253 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
254 | } | |
255 | ||
c2d6af84 PA |
256 | /* True if LWP is stopped in its stepping range. */ |
257 | ||
258 | static int | |
259 | lwp_in_step_range (struct lwp_info *lwp) | |
260 | { | |
261 | CORE_ADDR pc = lwp->stop_pc; | |
262 | ||
263 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
264 | } | |
265 | ||
0d62e5e8 DJ |
266 | struct pending_signals |
267 | { | |
268 | int signal; | |
32ca6d61 | 269 | siginfo_t info; |
0d62e5e8 DJ |
270 | struct pending_signals *prev; |
271 | }; | |
611cb4a5 | 272 | |
bd99dc85 PA |
273 | /* The read/write ends of the pipe registered as waitable file in the |
274 | event loop. */ | |
275 | static int linux_event_pipe[2] = { -1, -1 }; | |
276 | ||
277 | /* True if we're currently in async mode. */ | |
278 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
279 | ||
02fc4de7 | 280 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 281 | static void wait_for_sigstop (void); |
bd99dc85 | 282 | |
d0722149 DE |
283 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
284 | ||
285 | static int | |
214d508e | 286 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 287 | { |
214d508e L |
288 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
289 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
290 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
291 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
292 | { | |
293 | *machine = header->e_machine; | |
294 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
295 | ||
296 | } | |
297 | *machine = EM_NONE; | |
298 | return -1; | |
d0722149 DE |
299 | } |
300 | ||
301 | /* Return non-zero if FILE is a 64-bit ELF file, | |
302 | zero if the file is not a 64-bit ELF file, | |
303 | and -1 if the file is not accessible or doesn't exist. */ | |
304 | ||
be07f1a2 | 305 | static int |
214d508e | 306 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 307 | { |
957f3f49 | 308 | Elf64_Ehdr header; |
d0722149 DE |
309 | int fd; |
310 | ||
311 | fd = open (file, O_RDONLY); | |
312 | if (fd < 0) | |
313 | return -1; | |
314 | ||
315 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
316 | { | |
317 | close (fd); | |
318 | return 0; | |
319 | } | |
320 | close (fd); | |
321 | ||
214d508e | 322 | return elf_64_header_p (&header, machine); |
d0722149 DE |
323 | } |
324 | ||
be07f1a2 PA |
325 | /* Accepts an integer PID; Returns true if the executable PID is |
326 | running is a 64-bit ELF file.. */ | |
327 | ||
328 | int | |
214d508e | 329 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 330 | { |
d8d2a3ee | 331 | char file[PATH_MAX]; |
be07f1a2 PA |
332 | |
333 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 334 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
335 | } |
336 | ||
bd99dc85 PA |
337 | static void |
338 | delete_lwp (struct lwp_info *lwp) | |
339 | { | |
fa96cb38 PA |
340 | struct thread_info *thr = get_lwp_thread (lwp); |
341 | ||
342 | if (debug_threads) | |
343 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
344 | ||
345 | remove_thread (thr); | |
aa5ca48f | 346 | free (lwp->arch_private); |
bd99dc85 PA |
347 | free (lwp); |
348 | } | |
349 | ||
95954743 PA |
350 | /* Add a process to the common process list, and set its private |
351 | data. */ | |
352 | ||
353 | static struct process_info * | |
354 | linux_add_process (int pid, int attached) | |
355 | { | |
356 | struct process_info *proc; | |
357 | ||
95954743 PA |
358 | proc = add_process (pid, attached); |
359 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
360 | ||
3aee8918 PA |
361 | /* Set the arch when the first LWP stops. */ |
362 | proc->private->new_inferior = 1; | |
363 | ||
aa5ca48f DE |
364 | if (the_low_target.new_process != NULL) |
365 | proc->private->arch_private = the_low_target.new_process (); | |
366 | ||
95954743 PA |
367 | return proc; |
368 | } | |
369 | ||
582511be PA |
370 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
371 | ||
bd99dc85 PA |
372 | /* Handle a GNU/Linux extended wait response. If we see a clone |
373 | event, we need to add the new LWP to our list (and not report the | |
374 | trap to higher layers). */ | |
0d62e5e8 | 375 | |
24a09b5f | 376 | static void |
54a0b537 | 377 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f | 378 | { |
89a5711c | 379 | int event = linux_ptrace_get_extended_event (wstat); |
d86d4aaf | 380 | struct thread_info *event_thr = get_lwp_thread (event_child); |
54a0b537 | 381 | struct lwp_info *new_lwp; |
24a09b5f DJ |
382 | |
383 | if (event == PTRACE_EVENT_CLONE) | |
384 | { | |
95954743 | 385 | ptid_t ptid; |
24a09b5f | 386 | unsigned long new_pid; |
05044653 | 387 | int ret, status; |
24a09b5f | 388 | |
d86d4aaf | 389 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 390 | &new_pid); |
24a09b5f DJ |
391 | |
392 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 393 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
394 | { |
395 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
396 | hits the SIGSTOP, but we're already attached. */ | |
397 | ||
97438e3f | 398 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
399 | |
400 | if (ret == -1) | |
401 | perror_with_name ("waiting for new child"); | |
402 | else if (ret != new_pid) | |
403 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 404 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
405 | warning ("wait returned unexpected status 0x%x", status); |
406 | } | |
407 | ||
fa96cb38 PA |
408 | if (debug_threads) |
409 | debug_printf ("HEW: Got clone event " | |
410 | "from LWP %ld, new child is LWP %ld\n", | |
411 | lwpid_of (event_thr), new_pid); | |
412 | ||
d86d4aaf | 413 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 414 | new_lwp = add_lwp (ptid); |
24a09b5f | 415 | |
e27d73f6 DE |
416 | /* Either we're going to immediately resume the new thread |
417 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
418 | thinks the thread is currently running, so set this first | |
419 | before calling linux_resume_one_lwp. */ | |
420 | new_lwp->stopped = 1; | |
421 | ||
bde24c0a PA |
422 | /* If we're suspending all threads, leave this one suspended |
423 | too. */ | |
424 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
425 | new_lwp->suspended = 1; | |
426 | ||
da5898ce DJ |
427 | /* Normally we will get the pending SIGSTOP. But in some cases |
428 | we might get another signal delivered to the group first. | |
f21cc1a2 | 429 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
430 | if (WSTOPSIG (status) == SIGSTOP) |
431 | { | |
582511be | 432 | if (stopping_threads == NOT_STOPPING_THREADS) |
e27d73f6 | 433 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 434 | } |
24a09b5f | 435 | else |
da5898ce | 436 | { |
54a0b537 | 437 | new_lwp->stop_expected = 1; |
d50171e4 | 438 | |
bde24c0a | 439 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 440 | { |
54a0b537 PA |
441 | new_lwp->status_pending_p = 1; |
442 | new_lwp->status_pending = status; | |
da5898ce DJ |
443 | } |
444 | else | |
445 | /* Pass the signal on. This is what GDB does - except | |
446 | shouldn't we really report it instead? */ | |
e27d73f6 | 447 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 448 | } |
24a09b5f DJ |
449 | |
450 | /* Always resume the current thread. If we are stopping | |
451 | threads, it will have a pending SIGSTOP; we may as well | |
452 | collect it now. */ | |
2acc282a | 453 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
454 | } |
455 | } | |
456 | ||
d50171e4 PA |
457 | /* Return the PC as read from the regcache of LWP, without any |
458 | adjustment. */ | |
459 | ||
460 | static CORE_ADDR | |
461 | get_pc (struct lwp_info *lwp) | |
462 | { | |
0bfdf32f | 463 | struct thread_info *saved_thread; |
d50171e4 PA |
464 | struct regcache *regcache; |
465 | CORE_ADDR pc; | |
466 | ||
467 | if (the_low_target.get_pc == NULL) | |
468 | return 0; | |
469 | ||
0bfdf32f GB |
470 | saved_thread = current_thread; |
471 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 472 | |
0bfdf32f | 473 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
474 | pc = (*the_low_target.get_pc) (regcache); |
475 | ||
476 | if (debug_threads) | |
87ce2a04 | 477 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 478 | |
0bfdf32f | 479 | current_thread = saved_thread; |
d50171e4 PA |
480 | return pc; |
481 | } | |
482 | ||
483 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
484 | The SIGTRAP could mean several things. |
485 | ||
486 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
487 | |
488 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
489 | will get only the one SIGTRAP. The value of $eip will be the next | |
490 | instruction. If the instruction we stepped over was a breakpoint, | |
491 | we need to decrement the PC. | |
492 | ||
0d62e5e8 DJ |
493 | If we continue the process using PTRACE_CONT, we will get a |
494 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
495 | the instruction after the breakpoint (i.e. needs to be | |
496 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 497 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
498 | must resume at the decremented PC. |
499 | ||
582511be PA |
500 | On a non-decr_pc_after_break machine with hardware or kernel |
501 | single-step: | |
502 | ||
503 | If we either single-step a breakpoint instruction, or continue and | |
504 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
505 | instruction. */ |
506 | ||
582511be PA |
507 | static int |
508 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 509 | { |
582511be PA |
510 | CORE_ADDR pc; |
511 | CORE_ADDR sw_breakpoint_pc; | |
512 | struct thread_info *saved_thread; | |
d50171e4 PA |
513 | |
514 | if (the_low_target.get_pc == NULL) | |
515 | return 0; | |
0d62e5e8 | 516 | |
582511be PA |
517 | pc = get_pc (lwp); |
518 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 519 | |
582511be PA |
520 | /* breakpoint_at reads from the current thread. */ |
521 | saved_thread = current_thread; | |
522 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 523 | |
582511be PA |
524 | /* We may have just stepped a breakpoint instruction. E.g., in |
525 | non-stop mode, GDB first tells the thread A to step a range, and | |
526 | then the user inserts a breakpoint inside the range. In that | |
527 | case, we need to report the breakpoint PC. But, when we're | |
528 | trying to step past one of our own breakpoints, that happens to | |
529 | have been placed on top of a permanent breakpoint instruction, we | |
530 | shouldn't adjust the PC, otherwise the program would keep | |
531 | trapping the permanent breakpoint forever. */ | |
532 | if ((!lwp->stepping | |
533 | || (!ptid_equal (ptid_of (current_thread), step_over_bkpt) | |
534 | && lwp->stop_pc == sw_breakpoint_pc)) | |
535 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) | |
536 | { | |
537 | if (debug_threads) | |
538 | { | |
539 | struct thread_info *thr = get_lwp_thread (lwp); | |
540 | ||
541 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
542 | target_pid_to_str (ptid_of (thr))); | |
543 | } | |
544 | ||
545 | /* Back up the PC if necessary. */ | |
546 | if (pc != sw_breakpoint_pc) | |
547 | { | |
548 | struct regcache *regcache | |
549 | = get_thread_regcache (current_thread, 1); | |
550 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
551 | } | |
552 | ||
553 | lwp->stop_pc = sw_breakpoint_pc; | |
554 | lwp->stop_reason = LWP_STOPPED_BY_SW_BREAKPOINT; | |
555 | current_thread = saved_thread; | |
556 | return 1; | |
557 | } | |
558 | ||
559 | if (hardware_breakpoint_inserted_here (pc)) | |
560 | { | |
561 | if (debug_threads) | |
562 | { | |
563 | struct thread_info *thr = get_lwp_thread (lwp); | |
564 | ||
565 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
566 | target_pid_to_str (ptid_of (thr))); | |
567 | } | |
47c0c975 | 568 | |
582511be PA |
569 | lwp->stop_pc = pc; |
570 | lwp->stop_reason = LWP_STOPPED_BY_HW_BREAKPOINT; | |
571 | current_thread = saved_thread; | |
572 | return 1; | |
573 | } | |
574 | ||
575 | current_thread = saved_thread; | |
576 | return 0; | |
0d62e5e8 | 577 | } |
ce3a066d | 578 | |
b3312d80 | 579 | static struct lwp_info * |
95954743 | 580 | add_lwp (ptid_t ptid) |
611cb4a5 | 581 | { |
54a0b537 | 582 | struct lwp_info *lwp; |
0d62e5e8 | 583 | |
54a0b537 PA |
584 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
585 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 586 | |
aa5ca48f DE |
587 | if (the_low_target.new_thread != NULL) |
588 | lwp->arch_private = the_low_target.new_thread (); | |
589 | ||
f7667f0d | 590 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 591 | |
54a0b537 | 592 | return lwp; |
0d62e5e8 | 593 | } |
611cb4a5 | 594 | |
da6d8c04 DJ |
595 | /* Start an inferior process and returns its pid. |
596 | ALLARGS is a vector of program-name and args. */ | |
597 | ||
ce3a066d DJ |
598 | static int |
599 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 600 | { |
a6dbe5df | 601 | struct lwp_info *new_lwp; |
da6d8c04 | 602 | int pid; |
95954743 | 603 | ptid_t ptid; |
8cc73a39 SDJ |
604 | struct cleanup *restore_personality |
605 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 606 | |
42c81e2a | 607 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
608 | pid = vfork (); |
609 | #else | |
da6d8c04 | 610 | pid = fork (); |
52fb6437 | 611 | #endif |
da6d8c04 DJ |
612 | if (pid < 0) |
613 | perror_with_name ("fork"); | |
614 | ||
615 | if (pid == 0) | |
616 | { | |
602e3198 | 617 | close_most_fds (); |
b8e1b30e | 618 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 619 | |
1a981360 | 620 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 621 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 622 | #endif |
0d62e5e8 | 623 | |
a9fa9f7d DJ |
624 | setpgid (0, 0); |
625 | ||
e0f9f062 DE |
626 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
627 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
628 | Also, redirect stdin to /dev/null. */ | |
629 | if (remote_connection_is_stdio ()) | |
630 | { | |
631 | close (0); | |
632 | open ("/dev/null", O_RDONLY); | |
633 | dup2 (2, 1); | |
3e52c33d JK |
634 | if (write (2, "stdin/stdout redirected\n", |
635 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
636 | { |
637 | /* Errors ignored. */; | |
638 | } | |
e0f9f062 DE |
639 | } |
640 | ||
2b876972 DJ |
641 | execv (program, allargs); |
642 | if (errno == ENOENT) | |
643 | execvp (program, allargs); | |
da6d8c04 DJ |
644 | |
645 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 646 | strerror (errno)); |
da6d8c04 DJ |
647 | fflush (stderr); |
648 | _exit (0177); | |
649 | } | |
650 | ||
8cc73a39 | 651 | do_cleanups (restore_personality); |
03583c20 | 652 | |
95954743 PA |
653 | linux_add_process (pid, 0); |
654 | ||
655 | ptid = ptid_build (pid, pid, 0); | |
656 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 657 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 658 | |
a9fa9f7d | 659 | return pid; |
da6d8c04 DJ |
660 | } |
661 | ||
8784d563 PA |
662 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
663 | error. */ | |
da6d8c04 | 664 | |
7ae1a6a6 PA |
665 | int |
666 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 667 | { |
54a0b537 | 668 | struct lwp_info *new_lwp; |
7ae1a6a6 | 669 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 670 | |
b8e1b30e | 671 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 672 | != 0) |
7ae1a6a6 | 673 | return errno; |
24a09b5f | 674 | |
b3312d80 | 675 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 676 | |
a6dbe5df PA |
677 | /* We need to wait for SIGSTOP before being able to make the next |
678 | ptrace call on this LWP. */ | |
679 | new_lwp->must_set_ptrace_flags = 1; | |
680 | ||
644cebc9 | 681 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
682 | { |
683 | if (debug_threads) | |
87ce2a04 | 684 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
685 | |
686 | /* The process is definitely stopped. It is in a job control | |
687 | stop, unless the kernel predates the TASK_STOPPED / | |
688 | TASK_TRACED distinction, in which case it might be in a | |
689 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
690 | can kill it, signal it, et cetera. | |
691 | ||
692 | First make sure there is a pending SIGSTOP. Since we are | |
693 | already attached, the process can not transition from stopped | |
694 | to running without a PTRACE_CONT; so we know this signal will | |
695 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
696 | probably already in the queue (unless this kernel is old | |
697 | enough to use TASK_STOPPED for ptrace stops); but since | |
698 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
699 | kill_lwp (lwpid, SIGSTOP); | |
700 | ||
701 | /* Finally, resume the stopped process. This will deliver the | |
702 | SIGSTOP (or a higher priority signal, just like normal | |
703 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 704 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
705 | } |
706 | ||
0d62e5e8 | 707 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
708 | brings it to a halt. |
709 | ||
710 | There are several cases to consider here: | |
711 | ||
712 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 713 | of a new thread that is being created. |
d50171e4 PA |
714 | In this case we should ignore that SIGSTOP and resume the |
715 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 716 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 717 | resume_continue. |
0e21c1ec DE |
718 | |
719 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
720 | to it via attach_inferior. |
721 | In this case we want the process thread to stop. | |
d50171e4 PA |
722 | This is handled by having linux_attach set last_resume_kind == |
723 | resume_stop after we return. | |
e3deef73 LM |
724 | |
725 | If the pid we are attaching to is also the tgid, we attach to and | |
726 | stop all the existing threads. Otherwise, we attach to pid and | |
727 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
728 | |
729 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
730 | existing threads. |
731 | In this case we want the thread to stop. | |
732 | FIXME: This case is currently not properly handled. | |
733 | We should wait for the SIGSTOP but don't. Things work apparently | |
734 | because enough time passes between when we ptrace (ATTACH) and when | |
735 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
736 | |
737 | On the other hand, if we are currently trying to stop all threads, we | |
738 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 739 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
740 | end of the list, and so the new thread has not yet reached |
741 | wait_for_sigstop (but will). */ | |
d50171e4 | 742 | new_lwp->stop_expected = 1; |
0d62e5e8 | 743 | |
7ae1a6a6 | 744 | return 0; |
95954743 PA |
745 | } |
746 | ||
8784d563 PA |
747 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
748 | already attached. Returns true if a new LWP is found, false | |
749 | otherwise. */ | |
750 | ||
751 | static int | |
752 | attach_proc_task_lwp_callback (ptid_t ptid) | |
753 | { | |
754 | /* Is this a new thread? */ | |
755 | if (find_thread_ptid (ptid) == NULL) | |
756 | { | |
757 | int lwpid = ptid_get_lwp (ptid); | |
758 | int err; | |
759 | ||
760 | if (debug_threads) | |
761 | debug_printf ("Found new lwp %d\n", lwpid); | |
762 | ||
763 | err = linux_attach_lwp (ptid); | |
764 | ||
765 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
766 | is returned if the thread's task still exists, and is marked | |
767 | as exited or zombie, as well as other conditions, so in that | |
768 | case, confirm the status in /proc/PID/status. */ | |
769 | if (err == ESRCH | |
770 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
771 | { | |
772 | if (debug_threads) | |
773 | { | |
774 | debug_printf ("Cannot attach to lwp %d: " | |
775 | "thread is gone (%d: %s)\n", | |
776 | lwpid, err, strerror (err)); | |
777 | } | |
778 | } | |
779 | else if (err != 0) | |
780 | { | |
781 | warning (_("Cannot attach to lwp %d: %s"), | |
782 | lwpid, | |
783 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
784 | } | |
785 | ||
786 | return 1; | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
e3deef73 LM |
791 | /* Attach to PID. If PID is the tgid, attach to it and all |
792 | of its threads. */ | |
793 | ||
c52daf70 | 794 | static int |
a1928bad | 795 | linux_attach (unsigned long pid) |
0d62e5e8 | 796 | { |
7ae1a6a6 PA |
797 | ptid_t ptid = ptid_build (pid, pid, 0); |
798 | int err; | |
799 | ||
e3deef73 LM |
800 | /* Attach to PID. We will check for other threads |
801 | soon. */ | |
7ae1a6a6 PA |
802 | err = linux_attach_lwp (ptid); |
803 | if (err != 0) | |
804 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 805 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 806 | |
95954743 | 807 | linux_add_process (pid, 1); |
0d62e5e8 | 808 | |
bd99dc85 PA |
809 | if (!non_stop) |
810 | { | |
8336d594 PA |
811 | struct thread_info *thread; |
812 | ||
813 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
814 | process. It will be collected by wait shortly. */ | |
815 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
816 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 817 | } |
0d62e5e8 | 818 | |
8784d563 PA |
819 | /* We must attach to every LWP. If /proc is mounted, use that to |
820 | find them now. On the one hand, the inferior may be using raw | |
821 | clone instead of using pthreads. On the other hand, even if it | |
822 | is using pthreads, GDB may not be connected yet (thread_db needs | |
823 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
824 | structures in the inferior's address space to find the list of | |
825 | threads/LWPs, and those structures may well be corrupted. Note | |
826 | that once thread_db is loaded, we'll still use it to list threads | |
827 | and associate pthread info with each LWP. */ | |
828 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
829 | return 0; |
830 | } | |
831 | ||
832 | struct counter | |
833 | { | |
834 | int pid; | |
835 | int count; | |
836 | }; | |
837 | ||
838 | static int | |
839 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
840 | { | |
841 | struct counter *counter = args; | |
842 | ||
843 | if (ptid_get_pid (entry->id) == counter->pid) | |
844 | { | |
845 | if (++counter->count > 1) | |
846 | return 1; | |
847 | } | |
d61ddec4 | 848 | |
da6d8c04 DJ |
849 | return 0; |
850 | } | |
851 | ||
95954743 | 852 | static int |
fa96cb38 | 853 | last_thread_of_process_p (int pid) |
95954743 | 854 | { |
95954743 | 855 | struct counter counter = { pid , 0 }; |
da6d8c04 | 856 | |
95954743 PA |
857 | return (find_inferior (&all_threads, |
858 | second_thread_of_pid_p, &counter) == NULL); | |
859 | } | |
860 | ||
da84f473 PA |
861 | /* Kill LWP. */ |
862 | ||
863 | static void | |
864 | linux_kill_one_lwp (struct lwp_info *lwp) | |
865 | { | |
d86d4aaf DE |
866 | struct thread_info *thr = get_lwp_thread (lwp); |
867 | int pid = lwpid_of (thr); | |
da84f473 PA |
868 | |
869 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
870 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
871 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
872 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
873 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
874 | per process, not one for each thread. But since we still support | |
875 | linuxthreads, and we also support debugging programs using raw | |
876 | clone without CLONE_THREAD, we send one for each thread. For | |
877 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
878 | about some old kernels where PTRACE_KILL might work better | |
879 | (dubious if there are any such, but that's why it's paranoia), so | |
880 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
881 | everywhere. */ | |
882 | ||
883 | errno = 0; | |
69ff6be5 | 884 | kill_lwp (pid, SIGKILL); |
da84f473 | 885 | if (debug_threads) |
ce9e3fe7 PA |
886 | { |
887 | int save_errno = errno; | |
888 | ||
889 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
890 | target_pid_to_str (ptid_of (thr)), | |
891 | save_errno ? strerror (save_errno) : "OK"); | |
892 | } | |
da84f473 PA |
893 | |
894 | errno = 0; | |
b8e1b30e | 895 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 896 | if (debug_threads) |
ce9e3fe7 PA |
897 | { |
898 | int save_errno = errno; | |
899 | ||
900 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
901 | target_pid_to_str (ptid_of (thr)), | |
902 | save_errno ? strerror (save_errno) : "OK"); | |
903 | } | |
da84f473 PA |
904 | } |
905 | ||
e76126e8 PA |
906 | /* Kill LWP and wait for it to die. */ |
907 | ||
908 | static void | |
909 | kill_wait_lwp (struct lwp_info *lwp) | |
910 | { | |
911 | struct thread_info *thr = get_lwp_thread (lwp); | |
912 | int pid = ptid_get_pid (ptid_of (thr)); | |
913 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
914 | int wstat; | |
915 | int res; | |
916 | ||
917 | if (debug_threads) | |
918 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
919 | ||
920 | do | |
921 | { | |
922 | linux_kill_one_lwp (lwp); | |
923 | ||
924 | /* Make sure it died. Notes: | |
925 | ||
926 | - The loop is most likely unnecessary. | |
927 | ||
928 | - We don't use linux_wait_for_event as that could delete lwps | |
929 | while we're iterating over them. We're not interested in | |
930 | any pending status at this point, only in making sure all | |
931 | wait status on the kernel side are collected until the | |
932 | process is reaped. | |
933 | ||
934 | - We don't use __WALL here as the __WALL emulation relies on | |
935 | SIGCHLD, and killing a stopped process doesn't generate | |
936 | one, nor an exit status. | |
937 | */ | |
938 | res = my_waitpid (lwpid, &wstat, 0); | |
939 | if (res == -1 && errno == ECHILD) | |
940 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
941 | } while (res > 0 && WIFSTOPPED (wstat)); | |
942 | ||
943 | gdb_assert (res > 0); | |
944 | } | |
945 | ||
da84f473 PA |
946 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
947 | except the leader. */ | |
95954743 PA |
948 | |
949 | static int | |
da84f473 | 950 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 951 | { |
0d62e5e8 | 952 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 953 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
954 | int pid = * (int *) args; |
955 | ||
956 | if (ptid_get_pid (entry->id) != pid) | |
957 | return 0; | |
0d62e5e8 | 958 | |
fd500816 DJ |
959 | /* We avoid killing the first thread here, because of a Linux kernel (at |
960 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
961 | the children get a chance to be reaped, it will remain a zombie | |
962 | forever. */ | |
95954743 | 963 | |
d86d4aaf | 964 | if (lwpid_of (thread) == pid) |
95954743 PA |
965 | { |
966 | if (debug_threads) | |
87ce2a04 DE |
967 | debug_printf ("lkop: is last of process %s\n", |
968 | target_pid_to_str (entry->id)); | |
95954743 PA |
969 | return 0; |
970 | } | |
fd500816 | 971 | |
e76126e8 | 972 | kill_wait_lwp (lwp); |
95954743 | 973 | return 0; |
da6d8c04 DJ |
974 | } |
975 | ||
95954743 PA |
976 | static int |
977 | linux_kill (int pid) | |
0d62e5e8 | 978 | { |
95954743 | 979 | struct process_info *process; |
54a0b537 | 980 | struct lwp_info *lwp; |
fd500816 | 981 | |
95954743 PA |
982 | process = find_process_pid (pid); |
983 | if (process == NULL) | |
984 | return -1; | |
9d606399 | 985 | |
f9e39928 PA |
986 | /* If we're killing a running inferior, make sure it is stopped |
987 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 988 | stop_all_lwps (0, NULL); |
f9e39928 | 989 | |
da84f473 | 990 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 991 | |
54a0b537 | 992 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 993 | thread in the list, so do so now. */ |
95954743 | 994 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 995 | |
784867a5 | 996 | if (lwp == NULL) |
fd500816 | 997 | { |
784867a5 | 998 | if (debug_threads) |
d86d4aaf DE |
999 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1000 | pid); | |
784867a5 JK |
1001 | } |
1002 | else | |
e76126e8 | 1003 | kill_wait_lwp (lwp); |
2d717e4f | 1004 | |
8336d594 | 1005 | the_target->mourn (process); |
f9e39928 PA |
1006 | |
1007 | /* Since we presently can only stop all lwps of all processes, we | |
1008 | need to unstop lwps of other processes. */ | |
7984d532 | 1009 | unstop_all_lwps (0, NULL); |
95954743 | 1010 | return 0; |
0d62e5e8 DJ |
1011 | } |
1012 | ||
9b224c5e PA |
1013 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1014 | signal the thread last stopped for, which we need to deliver to the | |
1015 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1016 | ||
1017 | static int | |
1018 | get_detach_signal (struct thread_info *thread) | |
1019 | { | |
a493e3e2 | 1020 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1021 | int status; |
1022 | struct lwp_info *lp = get_thread_lwp (thread); | |
1023 | ||
1024 | if (lp->status_pending_p) | |
1025 | status = lp->status_pending; | |
1026 | else | |
1027 | { | |
1028 | /* If the thread had been suspended by gdbserver, and it stopped | |
1029 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1030 | want to deliver that SIGSTOP. */ | |
1031 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1032 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1033 | return 0; |
1034 | ||
1035 | /* Otherwise, we may need to deliver the signal we | |
1036 | intercepted. */ | |
1037 | status = lp->last_status; | |
1038 | } | |
1039 | ||
1040 | if (!WIFSTOPPED (status)) | |
1041 | { | |
1042 | if (debug_threads) | |
87ce2a04 | 1043 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1044 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1045 | return 0; |
1046 | } | |
1047 | ||
1048 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1049 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1050 | { |
1051 | if (debug_threads) | |
87ce2a04 DE |
1052 | debug_printf ("GPS: lwp %s had stopped with extended " |
1053 | "status: no pending signal\n", | |
d86d4aaf | 1054 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1055 | return 0; |
1056 | } | |
1057 | ||
2ea28649 | 1058 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1059 | |
1060 | if (program_signals_p && !program_signals[signo]) | |
1061 | { | |
1062 | if (debug_threads) | |
87ce2a04 | 1063 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1064 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1065 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1066 | return 0; |
1067 | } | |
1068 | else if (!program_signals_p | |
1069 | /* If we have no way to know which signals GDB does not | |
1070 | want to have passed to the program, assume | |
1071 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1072 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1073 | { |
1074 | if (debug_threads) | |
87ce2a04 DE |
1075 | debug_printf ("GPS: lwp %s had signal %s, " |
1076 | "but we don't know if we should pass it. " | |
1077 | "Default to not.\n", | |
d86d4aaf | 1078 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1079 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1080 | return 0; |
1081 | } | |
1082 | else | |
1083 | { | |
1084 | if (debug_threads) | |
87ce2a04 | 1085 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1086 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1087 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1088 | |
1089 | return WSTOPSIG (status); | |
1090 | } | |
1091 | } | |
1092 | ||
95954743 PA |
1093 | static int |
1094 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1095 | { |
1096 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1097 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1098 | int pid = * (int *) args; |
9b224c5e | 1099 | int sig; |
95954743 PA |
1100 | |
1101 | if (ptid_get_pid (entry->id) != pid) | |
1102 | return 0; | |
6ad8ae5c | 1103 | |
9b224c5e | 1104 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1105 | if (lwp->stop_expected) |
ae13219e | 1106 | { |
9b224c5e | 1107 | if (debug_threads) |
87ce2a04 | 1108 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1109 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1110 | |
d86d4aaf | 1111 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1112 | lwp->stop_expected = 0; |
ae13219e DJ |
1113 | } |
1114 | ||
1115 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1116 | regcache_invalidate_thread (thread); |
ae13219e | 1117 | |
9b224c5e PA |
1118 | /* Pass on any pending signal for this thread. */ |
1119 | sig = get_detach_signal (thread); | |
1120 | ||
ae13219e | 1121 | /* Finally, let it resume. */ |
82bfbe7e PA |
1122 | if (the_low_target.prepare_to_resume != NULL) |
1123 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1124 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1125 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1126 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1127 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1128 | strerror (errno)); |
bd99dc85 PA |
1129 | |
1130 | delete_lwp (lwp); | |
95954743 | 1131 | return 0; |
6ad8ae5c DJ |
1132 | } |
1133 | ||
95954743 PA |
1134 | static int |
1135 | linux_detach (int pid) | |
1136 | { | |
1137 | struct process_info *process; | |
1138 | ||
1139 | process = find_process_pid (pid); | |
1140 | if (process == NULL) | |
1141 | return -1; | |
1142 | ||
f9e39928 PA |
1143 | /* Stop all threads before detaching. First, ptrace requires that |
1144 | the thread is stopped to sucessfully detach. Second, thread_db | |
1145 | may need to uninstall thread event breakpoints from memory, which | |
1146 | only works with a stopped process anyway. */ | |
7984d532 | 1147 | stop_all_lwps (0, NULL); |
f9e39928 | 1148 | |
ca5c370d | 1149 | #ifdef USE_THREAD_DB |
8336d594 | 1150 | thread_db_detach (process); |
ca5c370d PA |
1151 | #endif |
1152 | ||
fa593d66 PA |
1153 | /* Stabilize threads (move out of jump pads). */ |
1154 | stabilize_threads (); | |
1155 | ||
95954743 | 1156 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1157 | |
1158 | the_target->mourn (process); | |
f9e39928 PA |
1159 | |
1160 | /* Since we presently can only stop all lwps of all processes, we | |
1161 | need to unstop lwps of other processes. */ | |
7984d532 | 1162 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1163 | return 0; |
1164 | } | |
1165 | ||
1166 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1167 | ||
1168 | static int | |
1169 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1170 | { | |
d86d4aaf DE |
1171 | struct thread_info *thread = (struct thread_info *) entry; |
1172 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1173 | struct process_info *process = proc; |
1174 | ||
d86d4aaf | 1175 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1176 | delete_lwp (lwp); |
1177 | ||
dd6953e1 | 1178 | return 0; |
6ad8ae5c DJ |
1179 | } |
1180 | ||
8336d594 PA |
1181 | static void |
1182 | linux_mourn (struct process_info *process) | |
1183 | { | |
1184 | struct process_info_private *priv; | |
1185 | ||
1186 | #ifdef USE_THREAD_DB | |
1187 | thread_db_mourn (process); | |
1188 | #endif | |
1189 | ||
d86d4aaf | 1190 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1191 | |
8336d594 PA |
1192 | /* Freeing all private data. */ |
1193 | priv = process->private; | |
1194 | free (priv->arch_private); | |
1195 | free (priv); | |
1196 | process->private = NULL; | |
505106cd PA |
1197 | |
1198 | remove_process (process); | |
8336d594 PA |
1199 | } |
1200 | ||
444d6139 | 1201 | static void |
95954743 | 1202 | linux_join (int pid) |
444d6139 | 1203 | { |
444d6139 PA |
1204 | int status, ret; |
1205 | ||
1206 | do { | |
95954743 | 1207 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1208 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1209 | break; | |
1210 | } while (ret != -1 || errno != ECHILD); | |
1211 | } | |
1212 | ||
6ad8ae5c | 1213 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1214 | static int |
95954743 | 1215 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1216 | { |
95954743 PA |
1217 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1218 | ||
1219 | /* We assume we always know if a thread exits. If a whole process | |
1220 | exited but we still haven't been able to report it to GDB, we'll | |
1221 | hold on to the last lwp of the dead process. */ | |
1222 | if (lwp != NULL) | |
1223 | return !lwp->dead; | |
0d62e5e8 DJ |
1224 | else |
1225 | return 0; | |
1226 | } | |
1227 | ||
582511be PA |
1228 | /* Return 1 if this lwp still has an interesting status pending. If |
1229 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1230 | false. */ | |
1231 | ||
1232 | static int | |
1233 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1234 | { | |
1235 | struct lwp_info *lp = get_thread_lwp (thread); | |
1236 | ||
1237 | if (!lp->status_pending_p) | |
1238 | return 0; | |
1239 | ||
1240 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1241 | report any status pending the LWP may have. */ | |
1242 | if (thread->last_resume_kind == resume_stop | |
1243 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1244 | return 0; | |
1245 | ||
1246 | if (thread->last_resume_kind != resume_stop | |
1247 | && (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1248 | || lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT)) | |
1249 | { | |
1250 | struct thread_info *saved_thread; | |
1251 | CORE_ADDR pc; | |
1252 | int discard = 0; | |
1253 | ||
1254 | gdb_assert (lp->last_status != 0); | |
1255 | ||
1256 | pc = get_pc (lp); | |
1257 | ||
1258 | saved_thread = current_thread; | |
1259 | current_thread = thread; | |
1260 | ||
1261 | if (pc != lp->stop_pc) | |
1262 | { | |
1263 | if (debug_threads) | |
1264 | debug_printf ("PC of %ld changed\n", | |
1265 | lwpid_of (thread)); | |
1266 | discard = 1; | |
1267 | } | |
1268 | else if (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1269 | && !(*the_low_target.breakpoint_at) (pc)) | |
1270 | { | |
1271 | if (debug_threads) | |
1272 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1273 | lwpid_of (thread)); | |
1274 | discard = 1; | |
1275 | } | |
1276 | else if (lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT | |
1277 | && !hardware_breakpoint_inserted_here (pc)) | |
1278 | { | |
1279 | if (debug_threads) | |
1280 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1281 | lwpid_of (thread)); | |
1282 | discard = 1; | |
1283 | } | |
1284 | ||
1285 | current_thread = saved_thread; | |
1286 | ||
1287 | if (discard) | |
1288 | { | |
1289 | if (debug_threads) | |
1290 | debug_printf ("discarding pending breakpoint status\n"); | |
1291 | lp->status_pending_p = 0; | |
1292 | return 0; | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | return 1; | |
1297 | } | |
1298 | ||
6bf5e0ba | 1299 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1300 | static int |
d50171e4 | 1301 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1302 | { |
d86d4aaf | 1303 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1304 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1305 | ptid_t ptid = * (ptid_t *) arg; |
1306 | ||
1307 | /* Check if we're only interested in events from a specific process | |
1308 | or its lwps. */ | |
1309 | if (!ptid_equal (minus_one_ptid, ptid) | |
d86d4aaf | 1310 | && ptid_get_pid (ptid) != ptid_get_pid (thread->entry.id)) |
95954743 | 1311 | return 0; |
0d62e5e8 | 1312 | |
582511be PA |
1313 | if (lp->status_pending_p |
1314 | && !thread_still_has_status_pending_p (thread)) | |
1315 | { | |
1316 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1317 | return 0; | |
1318 | } | |
0d62e5e8 | 1319 | |
582511be | 1320 | return lp->status_pending_p; |
0d62e5e8 DJ |
1321 | } |
1322 | ||
95954743 PA |
1323 | static int |
1324 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1325 | { | |
1326 | ptid_t ptid = *(ptid_t *) data; | |
1327 | int lwp; | |
1328 | ||
1329 | if (ptid_get_lwp (ptid) != 0) | |
1330 | lwp = ptid_get_lwp (ptid); | |
1331 | else | |
1332 | lwp = ptid_get_pid (ptid); | |
1333 | ||
1334 | if (ptid_get_lwp (entry->id) == lwp) | |
1335 | return 1; | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | struct lwp_info * | |
1341 | find_lwp_pid (ptid_t ptid) | |
1342 | { | |
d86d4aaf DE |
1343 | struct inferior_list_entry *thread |
1344 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1345 | ||
1346 | if (thread == NULL) | |
1347 | return NULL; | |
1348 | ||
1349 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1350 | } |
1351 | ||
fa96cb38 | 1352 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1353 | |
fa96cb38 PA |
1354 | static int |
1355 | num_lwps (int pid) | |
1356 | { | |
1357 | struct inferior_list_entry *inf, *tmp; | |
1358 | int count = 0; | |
0d62e5e8 | 1359 | |
fa96cb38 | 1360 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1361 | { |
fa96cb38 PA |
1362 | if (ptid_get_pid (inf->id) == pid) |
1363 | count++; | |
24a09b5f | 1364 | } |
3aee8918 | 1365 | |
fa96cb38 PA |
1366 | return count; |
1367 | } | |
d61ddec4 | 1368 | |
fa96cb38 PA |
1369 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1370 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1371 | |
fa96cb38 PA |
1372 | static void |
1373 | check_zombie_leaders (void) | |
1374 | { | |
1375 | struct process_info *proc, *tmp; | |
c3adc08c | 1376 | |
fa96cb38 | 1377 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1378 | { |
fa96cb38 PA |
1379 | pid_t leader_pid = pid_of (proc); |
1380 | struct lwp_info *leader_lp; | |
c3adc08c | 1381 | |
fa96cb38 | 1382 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1383 | |
fa96cb38 PA |
1384 | if (debug_threads) |
1385 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1386 | "num_lwps=%d, zombie=%d\n", | |
1387 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1388 | linux_proc_pid_is_zombie (leader_pid)); | |
1389 | ||
1390 | if (leader_lp != NULL | |
1391 | /* Check if there are other threads in the group, as we may | |
1392 | have raced with the inferior simply exiting. */ | |
1393 | && !last_thread_of_process_p (leader_pid) | |
1394 | && linux_proc_pid_is_zombie (leader_pid)) | |
1395 | { | |
1396 | /* A leader zombie can mean one of two things: | |
1397 | ||
1398 | - It exited, and there's an exit status pending | |
1399 | available, or only the leader exited (not the whole | |
1400 | program). In the latter case, we can't waitpid the | |
1401 | leader's exit status until all other threads are gone. | |
1402 | ||
1403 | - There are 3 or more threads in the group, and a thread | |
1404 | other than the leader exec'd. On an exec, the Linux | |
1405 | kernel destroys all other threads (except the execing | |
1406 | one) in the thread group, and resets the execing thread's | |
1407 | tid to the tgid. No exit notification is sent for the | |
1408 | execing thread -- from the ptracer's perspective, it | |
1409 | appears as though the execing thread just vanishes. | |
1410 | Until we reap all other threads except the leader and the | |
1411 | execing thread, the leader will be zombie, and the | |
1412 | execing thread will be in `D (disc sleep)'. As soon as | |
1413 | all other threads are reaped, the execing thread changes | |
1414 | it's tid to the tgid, and the previous (zombie) leader | |
1415 | vanishes, giving place to the "new" leader. We could try | |
1416 | distinguishing the exit and exec cases, by waiting once | |
1417 | more, and seeing if something comes out, but it doesn't | |
1418 | sound useful. The previous leader _does_ go away, and | |
1419 | we'll re-add the new one once we see the exec event | |
1420 | (which is just the same as what would happen if the | |
1421 | previous leader did exit voluntarily before some other | |
1422 | thread execs). */ | |
c3adc08c | 1423 | |
fa96cb38 PA |
1424 | if (debug_threads) |
1425 | fprintf (stderr, | |
1426 | "CZL: Thread group leader %d zombie " | |
1427 | "(it exited, or another thread execd).\n", | |
1428 | leader_pid); | |
c3adc08c | 1429 | |
fa96cb38 | 1430 | delete_lwp (leader_lp); |
c3adc08c PA |
1431 | } |
1432 | } | |
fa96cb38 | 1433 | } |
c3adc08c | 1434 | |
fa96cb38 PA |
1435 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1436 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1437 | |
fa96cb38 PA |
1438 | static int |
1439 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1440 | { | |
1441 | struct thread_info *thr = (struct thread_info *) entry; | |
1442 | struct lwp_info *lwp; | |
1443 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1444 | |
fa96cb38 PA |
1445 | if (!ptid_match (ptid_of (thr), filter)) |
1446 | return 0; | |
bd99dc85 | 1447 | |
fa96cb38 PA |
1448 | lwp = get_thread_lwp (thr); |
1449 | if (!lwp->stopped) | |
1450 | return 1; | |
1451 | ||
1452 | return 0; | |
0d62e5e8 | 1453 | } |
611cb4a5 | 1454 | |
219f2f23 PA |
1455 | /* This function should only be called if the LWP got a SIGTRAP. |
1456 | ||
1457 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1458 | event was handled, 0 otherwise. */ | |
1459 | ||
1460 | static int | |
1461 | handle_tracepoints (struct lwp_info *lwp) | |
1462 | { | |
1463 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1464 | int tpoint_related_event = 0; | |
1465 | ||
582511be PA |
1466 | gdb_assert (lwp->suspended == 0); |
1467 | ||
7984d532 PA |
1468 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1469 | uninsert tracepoints. To do this, we temporarily pause all | |
1470 | threads, unpatch away, and then unpause threads. We need to make | |
1471 | sure the unpausing doesn't resume LWP too. */ | |
1472 | lwp->suspended++; | |
1473 | ||
219f2f23 PA |
1474 | /* And we need to be sure that any all-threads-stopping doesn't try |
1475 | to move threads out of the jump pads, as it could deadlock the | |
1476 | inferior (LWP could be in the jump pad, maybe even holding the | |
1477 | lock.) */ | |
1478 | ||
1479 | /* Do any necessary step collect actions. */ | |
1480 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1481 | ||
fa593d66 PA |
1482 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1483 | ||
219f2f23 PA |
1484 | /* See if we just hit a tracepoint and do its main collect |
1485 | actions. */ | |
1486 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1487 | ||
7984d532 PA |
1488 | lwp->suspended--; |
1489 | ||
1490 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1491 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1492 | |
219f2f23 PA |
1493 | if (tpoint_related_event) |
1494 | { | |
1495 | if (debug_threads) | |
87ce2a04 | 1496 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1497 | return 1; |
1498 | } | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
fa593d66 PA |
1503 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1504 | fast tracepoint. */ | |
1505 | ||
1506 | static int | |
1507 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1508 | struct fast_tpoint_collect_status *status) | |
1509 | { | |
1510 | CORE_ADDR thread_area; | |
d86d4aaf | 1511 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1512 | |
1513 | if (the_low_target.get_thread_area == NULL) | |
1514 | return 0; | |
1515 | ||
1516 | /* Get the thread area address. This is used to recognize which | |
1517 | thread is which when tracing with the in-process agent library. | |
1518 | We don't read anything from the address, and treat it as opaque; | |
1519 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1520 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1521 | return 0; |
1522 | ||
1523 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1524 | } | |
1525 | ||
1526 | /* The reason we resume in the caller, is because we want to be able | |
1527 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1528 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1529 | refuses to resume. */ | |
1530 | ||
1531 | static int | |
1532 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1533 | { | |
0bfdf32f | 1534 | struct thread_info *saved_thread; |
fa593d66 | 1535 | |
0bfdf32f GB |
1536 | saved_thread = current_thread; |
1537 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1538 | |
1539 | if ((wstat == NULL | |
1540 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1541 | && supports_fast_tracepoints () | |
58b4daa5 | 1542 | && agent_loaded_p ()) |
fa593d66 PA |
1543 | { |
1544 | struct fast_tpoint_collect_status status; | |
1545 | int r; | |
1546 | ||
1547 | if (debug_threads) | |
87ce2a04 DE |
1548 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1549 | "jump pad.\n", | |
0bfdf32f | 1550 | lwpid_of (current_thread)); |
fa593d66 PA |
1551 | |
1552 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1553 | ||
1554 | if (wstat == NULL | |
1555 | || (WSTOPSIG (*wstat) != SIGILL | |
1556 | && WSTOPSIG (*wstat) != SIGFPE | |
1557 | && WSTOPSIG (*wstat) != SIGSEGV | |
1558 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1559 | { | |
1560 | lwp->collecting_fast_tracepoint = r; | |
1561 | ||
1562 | if (r != 0) | |
1563 | { | |
1564 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1565 | { | |
1566 | /* Haven't executed the original instruction yet. | |
1567 | Set breakpoint there, and wait till it's hit, | |
1568 | then single-step until exiting the jump pad. */ | |
1569 | lwp->exit_jump_pad_bkpt | |
1570 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1571 | } | |
1572 | ||
1573 | if (debug_threads) | |
87ce2a04 DE |
1574 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1575 | "the jump pad...it does\n", | |
0bfdf32f GB |
1576 | lwpid_of (current_thread)); |
1577 | current_thread = saved_thread; | |
fa593d66 PA |
1578 | |
1579 | return 1; | |
1580 | } | |
1581 | } | |
1582 | else | |
1583 | { | |
1584 | /* If we get a synchronous signal while collecting, *and* | |
1585 | while executing the (relocated) original instruction, | |
1586 | reset the PC to point at the tpoint address, before | |
1587 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1588 | report the signal to GDB, and pray for the best. */ | |
1589 | ||
1590 | lwp->collecting_fast_tracepoint = 0; | |
1591 | ||
1592 | if (r != 0 | |
1593 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1594 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1595 | { | |
1596 | siginfo_t info; | |
1597 | struct regcache *regcache; | |
1598 | ||
1599 | /* The si_addr on a few signals references the address | |
1600 | of the faulting instruction. Adjust that as | |
1601 | well. */ | |
1602 | if ((WSTOPSIG (*wstat) == SIGILL | |
1603 | || WSTOPSIG (*wstat) == SIGFPE | |
1604 | || WSTOPSIG (*wstat) == SIGBUS | |
1605 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1606 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1607 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1608 | /* Final check just to make sure we don't clobber |
1609 | the siginfo of non-kernel-sent signals. */ | |
1610 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1611 | { | |
1612 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1613 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1614 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1615 | } |
1616 | ||
0bfdf32f | 1617 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1618 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1619 | lwp->stop_pc = status.tpoint_addr; | |
1620 | ||
1621 | /* Cancel any fast tracepoint lock this thread was | |
1622 | holding. */ | |
1623 | force_unlock_trace_buffer (); | |
1624 | } | |
1625 | ||
1626 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1627 | { | |
1628 | if (debug_threads) | |
87ce2a04 DE |
1629 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1630 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1631 | |
1632 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1633 | |
1634 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1635 | lwp->exit_jump_pad_bkpt = NULL; | |
1636 | ||
1637 | unstop_all_lwps (1, lwp); | |
1638 | ||
1639 | gdb_assert (lwp->suspended >= 0); | |
1640 | } | |
1641 | } | |
1642 | } | |
1643 | ||
1644 | if (debug_threads) | |
87ce2a04 DE |
1645 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1646 | "jump pad...no\n", | |
0bfdf32f | 1647 | lwpid_of (current_thread)); |
0cccb683 | 1648 | |
0bfdf32f | 1649 | current_thread = saved_thread; |
fa593d66 PA |
1650 | return 0; |
1651 | } | |
1652 | ||
1653 | /* Enqueue one signal in the "signals to report later when out of the | |
1654 | jump pad" list. */ | |
1655 | ||
1656 | static void | |
1657 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1658 | { | |
1659 | struct pending_signals *p_sig; | |
d86d4aaf | 1660 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1661 | |
1662 | if (debug_threads) | |
87ce2a04 | 1663 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1664 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1665 | |
1666 | if (debug_threads) | |
1667 | { | |
1668 | struct pending_signals *sig; | |
1669 | ||
1670 | for (sig = lwp->pending_signals_to_report; | |
1671 | sig != NULL; | |
1672 | sig = sig->prev) | |
87ce2a04 DE |
1673 | debug_printf (" Already queued %d\n", |
1674 | sig->signal); | |
fa593d66 | 1675 | |
87ce2a04 | 1676 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1677 | } |
1678 | ||
1a981360 PA |
1679 | /* Don't enqueue non-RT signals if they are already in the deferred |
1680 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1681 | twice) */ | |
1682 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1683 | { | |
1684 | struct pending_signals *sig; | |
1685 | ||
1686 | for (sig = lwp->pending_signals_to_report; | |
1687 | sig != NULL; | |
1688 | sig = sig->prev) | |
1689 | { | |
1690 | if (sig->signal == WSTOPSIG (*wstat)) | |
1691 | { | |
1692 | if (debug_threads) | |
87ce2a04 DE |
1693 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1694 | " for LWP %ld\n", | |
1695 | sig->signal, | |
d86d4aaf | 1696 | lwpid_of (thread)); |
1a981360 PA |
1697 | return; |
1698 | } | |
1699 | } | |
1700 | } | |
1701 | ||
fa593d66 PA |
1702 | p_sig = xmalloc (sizeof (*p_sig)); |
1703 | p_sig->prev = lwp->pending_signals_to_report; | |
1704 | p_sig->signal = WSTOPSIG (*wstat); | |
1705 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1706 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1707 | &p_sig->info); |
fa593d66 PA |
1708 | |
1709 | lwp->pending_signals_to_report = p_sig; | |
1710 | } | |
1711 | ||
1712 | /* Dequeue one signal from the "signals to report later when out of | |
1713 | the jump pad" list. */ | |
1714 | ||
1715 | static int | |
1716 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1717 | { | |
d86d4aaf DE |
1718 | struct thread_info *thread = get_lwp_thread (lwp); |
1719 | ||
fa593d66 PA |
1720 | if (lwp->pending_signals_to_report != NULL) |
1721 | { | |
1722 | struct pending_signals **p_sig; | |
1723 | ||
1724 | p_sig = &lwp->pending_signals_to_report; | |
1725 | while ((*p_sig)->prev != NULL) | |
1726 | p_sig = &(*p_sig)->prev; | |
1727 | ||
1728 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1729 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1730 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1731 | &(*p_sig)->info); |
fa593d66 PA |
1732 | free (*p_sig); |
1733 | *p_sig = NULL; | |
1734 | ||
1735 | if (debug_threads) | |
87ce2a04 | 1736 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1737 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1738 | |
1739 | if (debug_threads) | |
1740 | { | |
1741 | struct pending_signals *sig; | |
1742 | ||
1743 | for (sig = lwp->pending_signals_to_report; | |
1744 | sig != NULL; | |
1745 | sig = sig->prev) | |
87ce2a04 DE |
1746 | debug_printf (" Still queued %d\n", |
1747 | sig->signal); | |
fa593d66 | 1748 | |
87ce2a04 | 1749 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1750 | } |
1751 | ||
1752 | return 1; | |
1753 | } | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
582511be | 1758 | /* Return true if the event in LP may be caused by breakpoint. */ |
d50171e4 PA |
1759 | |
1760 | static int | |
582511be | 1761 | wstatus_maybe_breakpoint (int wstatus) |
d50171e4 | 1762 | { |
582511be PA |
1763 | return (WIFSTOPPED (wstatus) |
1764 | && (WSTOPSIG (wstatus) == SIGTRAP | |
1765 | /* SIGILL and SIGSEGV are also treated as traps in case a | |
1766 | breakpoint is inserted at the current PC. */ | |
1767 | || WSTOPSIG (wstatus) == SIGILL | |
1768 | || WSTOPSIG (wstatus) == SIGSEGV)); | |
1769 | } | |
d50171e4 | 1770 | |
582511be PA |
1771 | /* Fetch the possibly triggered data watchpoint info and store it in |
1772 | CHILD. | |
d50171e4 | 1773 | |
582511be PA |
1774 | On some archs, like x86, that use debug registers to set |
1775 | watchpoints, it's possible that the way to know which watched | |
1776 | address trapped, is to check the register that is used to select | |
1777 | which address to watch. Problem is, between setting the watchpoint | |
1778 | and reading back which data address trapped, the user may change | |
1779 | the set of watchpoints, and, as a consequence, GDB changes the | |
1780 | debug registers in the inferior. To avoid reading back a stale | |
1781 | stopped-data-address when that happens, we cache in LP the fact | |
1782 | that a watchpoint trapped, and the corresponding data address, as | |
1783 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
1784 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 1785 | |
582511be PA |
1786 | static int |
1787 | check_stopped_by_watchpoint (struct lwp_info *child) | |
1788 | { | |
1789 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 1790 | { |
582511be | 1791 | struct thread_info *saved_thread; |
d50171e4 | 1792 | |
582511be PA |
1793 | saved_thread = current_thread; |
1794 | current_thread = get_lwp_thread (child); | |
1795 | ||
1796 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 1797 | { |
582511be PA |
1798 | child->stop_reason = LWP_STOPPED_BY_WATCHPOINT; |
1799 | ||
1800 | if (the_low_target.stopped_data_address != NULL) | |
1801 | child->stopped_data_address | |
1802 | = the_low_target.stopped_data_address (); | |
1803 | else | |
1804 | child->stopped_data_address = 0; | |
d50171e4 PA |
1805 | } |
1806 | ||
0bfdf32f | 1807 | current_thread = saved_thread; |
d50171e4 PA |
1808 | } |
1809 | ||
582511be | 1810 | return child->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
1811 | } |
1812 | ||
fa96cb38 PA |
1813 | /* Do low-level handling of the event, and check if we should go on |
1814 | and pass it to caller code. Return the affected lwp if we are, or | |
1815 | NULL otherwise. */ | |
1816 | ||
1817 | static struct lwp_info * | |
582511be | 1818 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
1819 | { |
1820 | struct lwp_info *child; | |
1821 | struct thread_info *thread; | |
582511be | 1822 | int have_stop_pc = 0; |
fa96cb38 PA |
1823 | |
1824 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1825 | ||
1826 | /* If we didn't find a process, one of two things presumably happened: | |
1827 | - A process we started and then detached from has exited. Ignore it. | |
1828 | - A process we are controlling has forked and the new child's stop | |
1829 | was reported to us by the kernel. Save its PID. */ | |
1830 | if (child == NULL && WIFSTOPPED (wstat)) | |
1831 | { | |
1832 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1833 | return NULL; | |
1834 | } | |
1835 | else if (child == NULL) | |
1836 | return NULL; | |
1837 | ||
1838 | thread = get_lwp_thread (child); | |
1839 | ||
1840 | child->stopped = 1; | |
1841 | ||
1842 | child->last_status = wstat; | |
1843 | ||
582511be PA |
1844 | /* Check if the thread has exited. */ |
1845 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
1846 | { | |
1847 | if (debug_threads) | |
1848 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
1849 | if (num_lwps (pid_of (thread)) > 1) | |
1850 | { | |
1851 | ||
1852 | /* If there is at least one more LWP, then the exit signal was | |
1853 | not the end of the debugged application and should be | |
1854 | ignored. */ | |
1855 | delete_lwp (child); | |
1856 | return NULL; | |
1857 | } | |
1858 | else | |
1859 | { | |
1860 | /* This was the last lwp in the process. Since events are | |
1861 | serialized to GDB core, and we can't report this one | |
1862 | right now, but GDB core and the other target layers will | |
1863 | want to be notified about the exit code/signal, leave the | |
1864 | status pending for the next time we're able to report | |
1865 | it. */ | |
1866 | mark_lwp_dead (child, wstat); | |
1867 | return child; | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | gdb_assert (WIFSTOPPED (wstat)); | |
1872 | ||
fa96cb38 PA |
1873 | if (WIFSTOPPED (wstat)) |
1874 | { | |
1875 | struct process_info *proc; | |
1876 | ||
1877 | /* Architecture-specific setup after inferior is running. This | |
1878 | needs to happen after we have attached to the inferior and it | |
1879 | is stopped for the first time, but before we access any | |
1880 | inferior registers. */ | |
1881 | proc = find_process_pid (pid_of (thread)); | |
1882 | if (proc->private->new_inferior) | |
1883 | { | |
0bfdf32f | 1884 | struct thread_info *saved_thread; |
fa96cb38 | 1885 | |
0bfdf32f GB |
1886 | saved_thread = current_thread; |
1887 | current_thread = thread; | |
fa96cb38 PA |
1888 | |
1889 | the_low_target.arch_setup (); | |
1890 | ||
0bfdf32f | 1891 | current_thread = saved_thread; |
fa96cb38 PA |
1892 | |
1893 | proc->private->new_inferior = 0; | |
1894 | } | |
1895 | } | |
1896 | ||
fa96cb38 PA |
1897 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
1898 | { | |
beed38b8 JB |
1899 | struct process_info *proc = find_process_pid (pid_of (thread)); |
1900 | ||
1901 | linux_enable_event_reporting (lwpid, proc->attached); | |
fa96cb38 PA |
1902 | child->must_set_ptrace_flags = 0; |
1903 | } | |
1904 | ||
582511be PA |
1905 | /* Be careful to not overwrite stop_pc until |
1906 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 1907 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 1908 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 1909 | { |
582511be | 1910 | child->stop_pc = get_pc (child); |
fa96cb38 PA |
1911 | handle_extended_wait (child, wstat); |
1912 | return NULL; | |
1913 | } | |
1914 | ||
582511be PA |
1915 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
1916 | && check_stopped_by_watchpoint (child)) | |
1917 | ; | |
1918 | else if (WIFSTOPPED (wstat) && wstatus_maybe_breakpoint (wstat)) | |
1919 | { | |
1920 | if (check_stopped_by_breakpoint (child)) | |
1921 | have_stop_pc = 1; | |
1922 | } | |
1923 | ||
1924 | if (!have_stop_pc) | |
1925 | child->stop_pc = get_pc (child); | |
1926 | ||
fa96cb38 PA |
1927 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
1928 | && child->stop_expected) | |
1929 | { | |
1930 | if (debug_threads) | |
1931 | debug_printf ("Expected stop.\n"); | |
1932 | child->stop_expected = 0; | |
1933 | ||
1934 | if (thread->last_resume_kind == resume_stop) | |
1935 | { | |
1936 | /* We want to report the stop to the core. Treat the | |
1937 | SIGSTOP as a normal event. */ | |
1938 | } | |
1939 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1940 | { | |
1941 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 1942 | pending. */ |
fa96cb38 PA |
1943 | return NULL; |
1944 | } | |
1945 | else | |
1946 | { | |
1947 | /* Filter out the event. */ | |
1948 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1949 | return NULL; | |
1950 | } | |
1951 | } | |
1952 | ||
582511be PA |
1953 | child->status_pending_p = 1; |
1954 | child->status_pending = wstat; | |
fa96cb38 PA |
1955 | return child; |
1956 | } | |
1957 | ||
fa96cb38 PA |
1958 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1959 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1960 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1961 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1962 | the stop status through the status pointer WSTAT. OPTIONS is | |
1963 | passed to the waitpid call. Return 0 if no event was found and | |
1964 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1965 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1966 | |
0d62e5e8 | 1967 | static int |
fa96cb38 PA |
1968 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1969 | int *wstatp, int options) | |
0d62e5e8 | 1970 | { |
d86d4aaf | 1971 | struct thread_info *event_thread; |
d50171e4 | 1972 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1973 | sigset_t block_mask, prev_mask; |
d50171e4 | 1974 | |
fa96cb38 | 1975 | retry: |
d86d4aaf DE |
1976 | /* N.B. event_thread points to the thread_info struct that contains |
1977 | event_child. Keep them in sync. */ | |
1978 | event_thread = NULL; | |
d50171e4 PA |
1979 | event_child = NULL; |
1980 | requested_child = NULL; | |
0d62e5e8 | 1981 | |
95954743 | 1982 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1983 | |
fa96cb38 | 1984 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 1985 | { |
d86d4aaf | 1986 | event_thread = (struct thread_info *) |
fa96cb38 | 1987 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
1988 | if (event_thread != NULL) |
1989 | event_child = get_thread_lwp (event_thread); | |
1990 | if (debug_threads && event_thread) | |
1991 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 1992 | } |
fa96cb38 | 1993 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 1994 | { |
fa96cb38 | 1995 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 1996 | |
bde24c0a | 1997 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1998 | && requested_child->status_pending_p |
1999 | && requested_child->collecting_fast_tracepoint) | |
2000 | { | |
2001 | enqueue_one_deferred_signal (requested_child, | |
2002 | &requested_child->status_pending); | |
2003 | requested_child->status_pending_p = 0; | |
2004 | requested_child->status_pending = 0; | |
2005 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2006 | } | |
2007 | ||
2008 | if (requested_child->suspended | |
2009 | && requested_child->status_pending_p) | |
38e08fca GB |
2010 | { |
2011 | internal_error (__FILE__, __LINE__, | |
2012 | "requesting an event out of a" | |
2013 | " suspended child?"); | |
2014 | } | |
fa593d66 | 2015 | |
d50171e4 | 2016 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2017 | { |
2018 | event_child = requested_child; | |
2019 | event_thread = get_lwp_thread (event_child); | |
2020 | } | |
0d62e5e8 | 2021 | } |
611cb4a5 | 2022 | |
0d62e5e8 DJ |
2023 | if (event_child != NULL) |
2024 | { | |
bd99dc85 | 2025 | if (debug_threads) |
87ce2a04 | 2026 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2027 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2028 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2029 | event_child->status_pending_p = 0; |
2030 | event_child->status_pending = 0; | |
0bfdf32f | 2031 | current_thread = event_thread; |
d86d4aaf | 2032 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2033 | } |
2034 | ||
fa96cb38 PA |
2035 | /* But if we don't find a pending event, we'll have to wait. |
2036 | ||
2037 | We only enter this loop if no process has a pending wait status. | |
2038 | Thus any action taken in response to a wait status inside this | |
2039 | loop is responding as soon as we detect the status, not after any | |
2040 | pending events. */ | |
d8301ad1 | 2041 | |
fa96cb38 PA |
2042 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2043 | all signals while here. */ | |
2044 | sigfillset (&block_mask); | |
2045 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2046 | ||
582511be PA |
2047 | /* Always pull all events out of the kernel. We'll randomly select |
2048 | an event LWP out of all that have events, to prevent | |
2049 | starvation. */ | |
fa96cb38 | 2050 | while (event_child == NULL) |
0d62e5e8 | 2051 | { |
fa96cb38 | 2052 | pid_t ret = 0; |
0d62e5e8 | 2053 | |
fa96cb38 PA |
2054 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2055 | quirks: | |
0d62e5e8 | 2056 | |
fa96cb38 PA |
2057 | - If the thread group leader exits while other threads in the |
2058 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2059 | waitpid won't return an exit status until the other threads | |
2060 | in the group are reaped. | |
611cb4a5 | 2061 | |
fa96cb38 PA |
2062 | - When a non-leader thread execs, that thread just vanishes |
2063 | without reporting an exit (so we'd hang if we waited for it | |
2064 | explicitly in that case). The exec event is reported to | |
2065 | the TGID pid (although we don't currently enable exec | |
2066 | events). */ | |
2067 | errno = 0; | |
2068 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2069 | |
fa96cb38 PA |
2070 | if (debug_threads) |
2071 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2072 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2073 | |
fa96cb38 | 2074 | if (ret > 0) |
0d62e5e8 | 2075 | { |
89be2091 | 2076 | if (debug_threads) |
bd99dc85 | 2077 | { |
fa96cb38 PA |
2078 | debug_printf ("LLW: waitpid %ld received %s\n", |
2079 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2080 | } |
89be2091 | 2081 | |
582511be PA |
2082 | /* Filter all events. IOW, leave all events pending. We'll |
2083 | randomly select an event LWP out of all that have events | |
2084 | below. */ | |
2085 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2086 | /* Retry until nothing comes out of waitpid. A single |
2087 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2088 | continue; |
2089 | } | |
2090 | ||
582511be PA |
2091 | /* Now that we've pulled all events out of the kernel, check if |
2092 | there's any LWP with a status to report to the core. */ | |
2093 | event_thread = (struct thread_info *) | |
2094 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2095 | if (event_thread != NULL) | |
2096 | { | |
2097 | event_child = get_thread_lwp (event_thread); | |
2098 | *wstatp = event_child->status_pending; | |
2099 | event_child->status_pending_p = 0; | |
2100 | event_child->status_pending = 0; | |
2101 | break; | |
2102 | } | |
2103 | ||
fa96cb38 PA |
2104 | /* Check for zombie thread group leaders. Those can't be reaped |
2105 | until all other threads in the thread group are. */ | |
2106 | check_zombie_leaders (); | |
2107 | ||
2108 | /* If there are no resumed children left in the set of LWPs we | |
2109 | want to wait for, bail. We can't just block in | |
2110 | waitpid/sigsuspend, because lwps might have been left stopped | |
2111 | in trace-stop state, and we'd be stuck forever waiting for | |
2112 | their status to change (which would only happen if we resumed | |
2113 | them). Even if WNOHANG is set, this return code is preferred | |
2114 | over 0 (below), as it is more detailed. */ | |
2115 | if ((find_inferior (&all_threads, | |
2116 | not_stopped_callback, | |
2117 | &wait_ptid) == NULL)) | |
a6dbe5df | 2118 | { |
fa96cb38 PA |
2119 | if (debug_threads) |
2120 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2121 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2122 | return -1; | |
a6dbe5df PA |
2123 | } |
2124 | ||
fa96cb38 PA |
2125 | /* No interesting event to report to the caller. */ |
2126 | if ((options & WNOHANG)) | |
24a09b5f | 2127 | { |
fa96cb38 PA |
2128 | if (debug_threads) |
2129 | debug_printf ("WNOHANG set, no event found\n"); | |
2130 | ||
2131 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2132 | return 0; | |
24a09b5f DJ |
2133 | } |
2134 | ||
fa96cb38 PA |
2135 | /* Block until we get an event reported with SIGCHLD. */ |
2136 | if (debug_threads) | |
2137 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2138 | |
fa96cb38 PA |
2139 | sigsuspend (&prev_mask); |
2140 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2141 | goto retry; | |
2142 | } | |
d50171e4 | 2143 | |
fa96cb38 | 2144 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2145 | |
0bfdf32f | 2146 | current_thread = event_thread; |
d50171e4 | 2147 | |
fa96cb38 PA |
2148 | /* Check for thread exit. */ |
2149 | if (! WIFSTOPPED (*wstatp)) | |
2150 | { | |
2151 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2152 | ||
2153 | if (debug_threads) | |
2154 | debug_printf ("LWP %d is the last lwp of process. " | |
2155 | "Process %ld exiting.\n", | |
2156 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2157 | return lwpid_of (event_thread); |
611cb4a5 | 2158 | } |
0d62e5e8 | 2159 | |
fa96cb38 PA |
2160 | return lwpid_of (event_thread); |
2161 | } | |
2162 | ||
2163 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2164 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2165 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2166 | the stop status through the status pointer WSTAT. OPTIONS is | |
2167 | passed to the waitpid call. Return 0 if no event was found and | |
2168 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2169 | was found. Return the PID of the stopped child otherwise. */ | |
2170 | ||
2171 | static int | |
2172 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2173 | { | |
2174 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2175 | } |
2176 | ||
6bf5e0ba PA |
2177 | /* Count the LWP's that have had events. */ |
2178 | ||
2179 | static int | |
2180 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2181 | { | |
d86d4aaf | 2182 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2183 | int *count = data; |
2184 | ||
2185 | gdb_assert (count != NULL); | |
2186 | ||
582511be | 2187 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 PA |
2188 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2189 | && thread->last_resume_kind != resume_stop | |
582511be | 2190 | && thread->status_pending_p) |
6bf5e0ba PA |
2191 | (*count)++; |
2192 | ||
2193 | return 0; | |
2194 | } | |
2195 | ||
2196 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2197 | ||
2198 | static int | |
2199 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2200 | { | |
d86d4aaf DE |
2201 | struct thread_info *thread = (struct thread_info *) entry; |
2202 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2203 | |
8336d594 PA |
2204 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2205 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2206 | && lp->status_pending_p) |
2207 | return 1; | |
2208 | else | |
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2213 | reported to GDB. */ | |
2214 | ||
2215 | static int | |
2216 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2217 | { | |
d86d4aaf | 2218 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2219 | int *selector = data; |
2220 | ||
2221 | gdb_assert (selector != NULL); | |
2222 | ||
582511be | 2223 | /* Select only resumed LWPs that have an event pending. */ |
8336d594 PA |
2224 | if (thread->last_resume_kind != resume_stop |
2225 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
582511be | 2226 | && thread->status_pending_p) |
6bf5e0ba PA |
2227 | if ((*selector)-- == 0) |
2228 | return 1; | |
2229 | ||
2230 | return 0; | |
2231 | } | |
2232 | ||
6bf5e0ba PA |
2233 | /* Select one LWP out of those that have events pending. */ |
2234 | ||
2235 | static void | |
2236 | select_event_lwp (struct lwp_info **orig_lp) | |
2237 | { | |
2238 | int num_events = 0; | |
2239 | int random_selector; | |
582511be PA |
2240 | struct thread_info *event_thread = NULL; |
2241 | ||
2242 | /* In all-stop, give preference to the LWP that is being | |
2243 | single-stepped. There will be at most one, and it's the LWP that | |
2244 | the core is most interested in. If we didn't do this, then we'd | |
2245 | have to handle pending step SIGTRAPs somehow in case the core | |
2246 | later continues the previously-stepped thread, otherwise we'd | |
2247 | report the pending SIGTRAP, and the core, not having stepped the | |
2248 | thread, wouldn't understand what the trap was for, and therefore | |
2249 | would report it to the user as a random signal. */ | |
2250 | if (!non_stop) | |
6bf5e0ba | 2251 | { |
582511be PA |
2252 | event_thread |
2253 | = (struct thread_info *) find_inferior (&all_threads, | |
2254 | select_singlestep_lwp_callback, | |
2255 | NULL); | |
2256 | if (event_thread != NULL) | |
2257 | { | |
2258 | if (debug_threads) | |
2259 | debug_printf ("SEL: Select single-step %s\n", | |
2260 | target_pid_to_str (ptid_of (event_thread))); | |
2261 | } | |
6bf5e0ba | 2262 | } |
582511be | 2263 | if (event_thread == NULL) |
6bf5e0ba PA |
2264 | { |
2265 | /* No single-stepping LWP. Select one at random, out of those | |
2266 | which have had SIGTRAP events. */ | |
2267 | ||
2268 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2269 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2270 | |
2271 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2272 | random_selector = (int) | |
2273 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2274 | ||
2275 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2276 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2277 | num_events, random_selector); | |
6bf5e0ba | 2278 | |
d86d4aaf DE |
2279 | event_thread |
2280 | = (struct thread_info *) find_inferior (&all_threads, | |
2281 | select_event_lwp_callback, | |
2282 | &random_selector); | |
6bf5e0ba PA |
2283 | } |
2284 | ||
d86d4aaf | 2285 | if (event_thread != NULL) |
6bf5e0ba | 2286 | { |
d86d4aaf DE |
2287 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2288 | ||
6bf5e0ba PA |
2289 | /* Switch the event LWP. */ |
2290 | *orig_lp = event_lp; | |
2291 | } | |
2292 | } | |
2293 | ||
7984d532 PA |
2294 | /* Decrement the suspend count of an LWP. */ |
2295 | ||
2296 | static int | |
2297 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2298 | { | |
d86d4aaf DE |
2299 | struct thread_info *thread = (struct thread_info *) entry; |
2300 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2301 | |
2302 | /* Ignore EXCEPT. */ | |
2303 | if (lwp == except) | |
2304 | return 0; | |
2305 | ||
2306 | lwp->suspended--; | |
2307 | ||
2308 | gdb_assert (lwp->suspended >= 0); | |
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2313 | NULL. */ | |
2314 | ||
2315 | static void | |
2316 | unsuspend_all_lwps (struct lwp_info *except) | |
2317 | { | |
d86d4aaf | 2318 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2319 | } |
2320 | ||
fa593d66 PA |
2321 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2322 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2323 | void *data); | |
2324 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2325 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2326 | struct target_waitstatus *ourstatus, | |
2327 | int target_options); | |
2328 | ||
2329 | /* Stabilize threads (move out of jump pads). | |
2330 | ||
2331 | If a thread is midway collecting a fast tracepoint, we need to | |
2332 | finish the collection and move it out of the jump pad before | |
2333 | reporting the signal. | |
2334 | ||
2335 | This avoids recursion while collecting (when a signal arrives | |
2336 | midway, and the signal handler itself collects), which would trash | |
2337 | the trace buffer. In case the user set a breakpoint in a signal | |
2338 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2339 | Most importantly, there are certain things we can't do safely if | |
2340 | threads are stopped in a jump pad (or in its callee's). For | |
2341 | example: | |
2342 | ||
2343 | - starting a new trace run. A thread still collecting the | |
2344 | previous run, could trash the trace buffer when resumed. The trace | |
2345 | buffer control structures would have been reset but the thread had | |
2346 | no way to tell. The thread could even midway memcpy'ing to the | |
2347 | buffer, which would mean that when resumed, it would clobber the | |
2348 | trace buffer that had been set for a new run. | |
2349 | ||
2350 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2351 | safely. Say you do tstart while a thread is stopped midway while | |
2352 | collecting. When the thread is later resumed, it finishes the | |
2353 | collection, and returns to the jump pad, to execute the original | |
2354 | instruction that was under the tracepoint jump at the time the | |
2355 | older run had been started. If the jump pad had been rewritten | |
2356 | since for something else in the new run, the thread would now | |
2357 | execute the wrong / random instructions. */ | |
2358 | ||
2359 | static void | |
2360 | linux_stabilize_threads (void) | |
2361 | { | |
0bfdf32f | 2362 | struct thread_info *saved_thread; |
d86d4aaf | 2363 | struct thread_info *thread_stuck; |
fa593d66 | 2364 | |
d86d4aaf DE |
2365 | thread_stuck |
2366 | = (struct thread_info *) find_inferior (&all_threads, | |
2367 | stuck_in_jump_pad_callback, | |
2368 | NULL); | |
2369 | if (thread_stuck != NULL) | |
fa593d66 | 2370 | { |
b4d51a55 | 2371 | if (debug_threads) |
87ce2a04 | 2372 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2373 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2374 | return; |
2375 | } | |
2376 | ||
0bfdf32f | 2377 | saved_thread = current_thread; |
fa593d66 PA |
2378 | |
2379 | stabilizing_threads = 1; | |
2380 | ||
2381 | /* Kick 'em all. */ | |
d86d4aaf | 2382 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2383 | |
2384 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2385 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2386 | { |
2387 | struct target_waitstatus ourstatus; | |
2388 | struct lwp_info *lwp; | |
fa593d66 PA |
2389 | int wstat; |
2390 | ||
2391 | /* Note that we go through the full wait even loop. While | |
2392 | moving threads out of jump pad, we need to be able to step | |
2393 | over internal breakpoints and such. */ | |
32fcada3 | 2394 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2395 | |
2396 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2397 | { | |
0bfdf32f | 2398 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2399 | |
2400 | /* Lock it. */ | |
2401 | lwp->suspended++; | |
2402 | ||
a493e3e2 | 2403 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2404 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2405 | { |
2ea28649 | 2406 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2407 | enqueue_one_deferred_signal (lwp, &wstat); |
2408 | } | |
2409 | } | |
2410 | } | |
2411 | ||
d86d4aaf | 2412 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2413 | |
2414 | stabilizing_threads = 0; | |
2415 | ||
0bfdf32f | 2416 | current_thread = saved_thread; |
fa593d66 | 2417 | |
b4d51a55 | 2418 | if (debug_threads) |
fa593d66 | 2419 | { |
d86d4aaf DE |
2420 | thread_stuck |
2421 | = (struct thread_info *) find_inferior (&all_threads, | |
2422 | stuck_in_jump_pad_callback, | |
2423 | NULL); | |
2424 | if (thread_stuck != NULL) | |
87ce2a04 | 2425 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2426 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2427 | } |
2428 | } | |
2429 | ||
582511be PA |
2430 | static void async_file_mark (void); |
2431 | ||
2432 | /* Convenience function that is called when the kernel reports an | |
2433 | event that is not passed out to GDB. */ | |
2434 | ||
2435 | static ptid_t | |
2436 | ignore_event (struct target_waitstatus *ourstatus) | |
2437 | { | |
2438 | /* If we got an event, there may still be others, as a single | |
2439 | SIGCHLD can indicate more than one child stopped. This forces | |
2440 | another target_wait call. */ | |
2441 | async_file_mark (); | |
2442 | ||
2443 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2444 | return null_ptid; | |
2445 | } | |
2446 | ||
0d62e5e8 | 2447 | /* Wait for process, returns status. */ |
da6d8c04 | 2448 | |
95954743 PA |
2449 | static ptid_t |
2450 | linux_wait_1 (ptid_t ptid, | |
2451 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2452 | { |
e5f1222d | 2453 | int w; |
fc7238bb | 2454 | struct lwp_info *event_child; |
bd99dc85 | 2455 | int options; |
bd99dc85 | 2456 | int pid; |
6bf5e0ba PA |
2457 | int step_over_finished; |
2458 | int bp_explains_trap; | |
2459 | int maybe_internal_trap; | |
2460 | int report_to_gdb; | |
219f2f23 | 2461 | int trace_event; |
c2d6af84 | 2462 | int in_step_range; |
bd99dc85 | 2463 | |
87ce2a04 DE |
2464 | if (debug_threads) |
2465 | { | |
2466 | debug_enter (); | |
2467 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2468 | } | |
2469 | ||
bd99dc85 PA |
2470 | /* Translate generic target options into linux options. */ |
2471 | options = __WALL; | |
2472 | if (target_options & TARGET_WNOHANG) | |
2473 | options |= WNOHANG; | |
0d62e5e8 | 2474 | |
fa593d66 PA |
2475 | bp_explains_trap = 0; |
2476 | trace_event = 0; | |
c2d6af84 | 2477 | in_step_range = 0; |
bd99dc85 PA |
2478 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2479 | ||
6bf5e0ba PA |
2480 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2481 | pid = linux_wait_for_event (ptid, &w, options); | |
2482 | else | |
2483 | { | |
2484 | if (debug_threads) | |
87ce2a04 DE |
2485 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2486 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2487 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2488 | } | |
2489 | ||
fa96cb38 | 2490 | if (pid == 0) |
87ce2a04 | 2491 | { |
fa96cb38 PA |
2492 | gdb_assert (target_options & TARGET_WNOHANG); |
2493 | ||
87ce2a04 DE |
2494 | if (debug_threads) |
2495 | { | |
fa96cb38 PA |
2496 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2497 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2498 | debug_exit (); |
2499 | } | |
fa96cb38 PA |
2500 | |
2501 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2502 | return null_ptid; |
2503 | } | |
fa96cb38 PA |
2504 | else if (pid == -1) |
2505 | { | |
2506 | if (debug_threads) | |
2507 | { | |
2508 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2509 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2510 | debug_exit (); | |
2511 | } | |
bd99dc85 | 2512 | |
fa96cb38 PA |
2513 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2514 | return null_ptid; | |
2515 | } | |
0d62e5e8 | 2516 | |
0bfdf32f | 2517 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2518 | |
fa96cb38 PA |
2519 | /* linux_wait_for_event only returns an exit status for the last |
2520 | child of a process. Report it. */ | |
2521 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2522 | { |
fa96cb38 | 2523 | if (WIFEXITED (w)) |
0d62e5e8 | 2524 | { |
fa96cb38 PA |
2525 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2526 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2527 | |
fa96cb38 | 2528 | if (debug_threads) |
bd99dc85 | 2529 | { |
fa96cb38 PA |
2530 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2531 | "retcode %d\n", | |
0bfdf32f | 2532 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2533 | WEXITSTATUS (w)); |
2534 | debug_exit (); | |
bd99dc85 | 2535 | } |
fa96cb38 PA |
2536 | } |
2537 | else | |
2538 | { | |
2539 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2540 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2541 | |
fa96cb38 PA |
2542 | if (debug_threads) |
2543 | { | |
2544 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2545 | "signal %d\n", | |
0bfdf32f | 2546 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2547 | WTERMSIG (w)); |
2548 | debug_exit (); | |
2549 | } | |
0d62e5e8 | 2550 | } |
fa96cb38 | 2551 | |
0bfdf32f | 2552 | return ptid_of (current_thread); |
da6d8c04 DJ |
2553 | } |
2554 | ||
6bf5e0ba PA |
2555 | /* If this event was not handled before, and is not a SIGTRAP, we |
2556 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2557 | a breakpoint is inserted at the current PC. If this target does | |
2558 | not support internal breakpoints at all, we also report the | |
2559 | SIGTRAP without further processing; it's of no concern to us. */ | |
2560 | maybe_internal_trap | |
2561 | = (supports_breakpoints () | |
2562 | && (WSTOPSIG (w) == SIGTRAP | |
2563 | || ((WSTOPSIG (w) == SIGILL | |
2564 | || WSTOPSIG (w) == SIGSEGV) | |
2565 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2566 | ||
2567 | if (maybe_internal_trap) | |
2568 | { | |
2569 | /* Handle anything that requires bookkeeping before deciding to | |
2570 | report the event or continue waiting. */ | |
2571 | ||
2572 | /* First check if we can explain the SIGTRAP with an internal | |
2573 | breakpoint, or if we should possibly report the event to GDB. | |
2574 | Do this before anything that may remove or insert a | |
2575 | breakpoint. */ | |
2576 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2577 | ||
2578 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2579 | finished. If so, tweak the state machine accordingly, | |
2580 | reinsert breakpoints and delete any reinsert (software | |
2581 | single-step) breakpoints. */ | |
2582 | step_over_finished = finish_step_over (event_child); | |
2583 | ||
2584 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2585 | check_breakpoints (event_child->stop_pc); | |
2586 | ||
219f2f23 PA |
2587 | /* Handle tracepoint data collecting. This may overflow the |
2588 | trace buffer, and cause a tracing stop, removing | |
2589 | breakpoints. */ | |
2590 | trace_event = handle_tracepoints (event_child); | |
2591 | ||
6bf5e0ba PA |
2592 | if (bp_explains_trap) |
2593 | { | |
2594 | /* If we stepped or ran into an internal breakpoint, we've | |
2595 | already handled it. So next time we resume (from this | |
2596 | PC), we should step over it. */ | |
2597 | if (debug_threads) | |
87ce2a04 | 2598 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2599 | |
8b07ae33 PA |
2600 | if (breakpoint_here (event_child->stop_pc)) |
2601 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2602 | } |
2603 | } | |
2604 | else | |
2605 | { | |
2606 | /* We have some other signal, possibly a step-over dance was in | |
2607 | progress, and it should be cancelled too. */ | |
2608 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2609 | } |
2610 | ||
2611 | /* We have all the data we need. Either report the event to GDB, or | |
2612 | resume threads and keep waiting for more. */ | |
2613 | ||
2614 | /* If we're collecting a fast tracepoint, finish the collection and | |
2615 | move out of the jump pad before delivering a signal. See | |
2616 | linux_stabilize_threads. */ | |
2617 | ||
2618 | if (WIFSTOPPED (w) | |
2619 | && WSTOPSIG (w) != SIGTRAP | |
2620 | && supports_fast_tracepoints () | |
58b4daa5 | 2621 | && agent_loaded_p ()) |
fa593d66 PA |
2622 | { |
2623 | if (debug_threads) | |
87ce2a04 DE |
2624 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2625 | "to defer or adjust it.\n", | |
0bfdf32f | 2626 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2627 | |
2628 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2629 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2630 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2631 | { | |
2632 | enqueue_one_deferred_signal (event_child, &w); | |
2633 | ||
2634 | if (debug_threads) | |
87ce2a04 | 2635 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2636 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2637 | |
2638 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2639 | |
2640 | return ignore_event (ourstatus); | |
fa593d66 PA |
2641 | } |
2642 | } | |
219f2f23 | 2643 | |
fa593d66 PA |
2644 | if (event_child->collecting_fast_tracepoint) |
2645 | { | |
2646 | if (debug_threads) | |
87ce2a04 DE |
2647 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2648 | "Check if we're already there.\n", | |
0bfdf32f | 2649 | lwpid_of (current_thread), |
87ce2a04 | 2650 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2651 | |
2652 | trace_event = 1; | |
2653 | ||
2654 | event_child->collecting_fast_tracepoint | |
2655 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2656 | ||
2657 | if (event_child->collecting_fast_tracepoint != 1) | |
2658 | { | |
2659 | /* No longer need this breakpoint. */ | |
2660 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2661 | { | |
2662 | if (debug_threads) | |
87ce2a04 DE |
2663 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2664 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2665 | |
2666 | /* Other running threads could hit this breakpoint. | |
2667 | We don't handle moribund locations like GDB does, | |
2668 | instead we always pause all threads when removing | |
2669 | breakpoints, so that any step-over or | |
2670 | decr_pc_after_break adjustment is always taken | |
2671 | care of while the breakpoint is still | |
2672 | inserted. */ | |
2673 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
2674 | |
2675 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2676 | event_child->exit_jump_pad_bkpt = NULL; | |
2677 | ||
2678 | unstop_all_lwps (1, event_child); | |
2679 | ||
2680 | gdb_assert (event_child->suspended >= 0); | |
2681 | } | |
2682 | } | |
2683 | ||
2684 | if (event_child->collecting_fast_tracepoint == 0) | |
2685 | { | |
2686 | if (debug_threads) | |
87ce2a04 DE |
2687 | debug_printf ("fast tracepoint finished " |
2688 | "collecting successfully.\n"); | |
fa593d66 PA |
2689 | |
2690 | /* We may have a deferred signal to report. */ | |
2691 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2692 | { | |
2693 | if (debug_threads) | |
87ce2a04 | 2694 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2695 | } |
3c11dd79 | 2696 | else |
fa593d66 | 2697 | { |
3c11dd79 | 2698 | if (debug_threads) |
87ce2a04 | 2699 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2700 | |
2701 | if (stabilizing_threads) | |
2702 | { | |
2703 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2704 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2705 | |
2706 | if (debug_threads) | |
2707 | { | |
2708 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2709 | "while stabilizing threads\n", | |
0bfdf32f | 2710 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
2711 | debug_exit (); |
2712 | } | |
2713 | ||
0bfdf32f | 2714 | return ptid_of (current_thread); |
fa593d66 PA |
2715 | } |
2716 | } | |
2717 | } | |
6bf5e0ba PA |
2718 | } |
2719 | ||
e471f25b PA |
2720 | /* Check whether GDB would be interested in this event. */ |
2721 | ||
2722 | /* If GDB is not interested in this signal, don't stop other | |
2723 | threads, and don't report it to GDB. Just resume the inferior | |
2724 | right away. We do this for threading-related signals as well as | |
2725 | any that GDB specifically requested we ignore. But never ignore | |
2726 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2727 | stepping - they may require special handling to skip the signal | |
2728 | handler. */ | |
2729 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2730 | thread library? */ | |
2731 | if (WIFSTOPPED (w) | |
0bfdf32f | 2732 | && current_thread->last_resume_kind != resume_step |
e471f25b | 2733 | && ( |
1a981360 | 2734 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2735 | (current_process ()->private->thread_db != NULL |
2736 | && (WSTOPSIG (w) == __SIGRTMIN | |
2737 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2738 | || | |
2739 | #endif | |
2ea28649 | 2740 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 2741 | && !(WSTOPSIG (w) == SIGSTOP |
0bfdf32f | 2742 | && current_thread->last_resume_kind == resume_stop)))) |
e471f25b PA |
2743 | { |
2744 | siginfo_t info, *info_p; | |
2745 | ||
2746 | if (debug_threads) | |
87ce2a04 | 2747 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 2748 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 2749 | |
0bfdf32f | 2750 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2751 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2752 | info_p = &info; |
2753 | else | |
2754 | info_p = NULL; | |
2755 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2756 | WSTOPSIG (w), info_p); | |
582511be | 2757 | return ignore_event (ourstatus); |
e471f25b PA |
2758 | } |
2759 | ||
c2d6af84 PA |
2760 | /* Note that all addresses are always "out of the step range" when |
2761 | there's no range to begin with. */ | |
2762 | in_step_range = lwp_in_step_range (event_child); | |
2763 | ||
2764 | /* If GDB wanted this thread to single step, and the thread is out | |
2765 | of the step range, we always want to report the SIGTRAP, and let | |
2766 | GDB handle it. Watchpoints should always be reported. So should | |
2767 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2768 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2769 | do, we're be able to handle GDB breakpoints on top of internal | |
2770 | breakpoints, by handling the internal breakpoint and still | |
2771 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2772 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2773 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 2774 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 2775 | && !in_step_range) |
582511be | 2776 | || event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
c2d6af84 | 2777 | || (!step_over_finished && !in_step_range |
493e2a69 | 2778 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2779 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2780 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2781 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2782 | ||
2783 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2784 | |
2785 | /* We found no reason GDB would want us to stop. We either hit one | |
2786 | of our own breakpoints, or finished an internal step GDB | |
2787 | shouldn't know about. */ | |
2788 | if (!report_to_gdb) | |
2789 | { | |
2790 | if (debug_threads) | |
2791 | { | |
2792 | if (bp_explains_trap) | |
87ce2a04 | 2793 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2794 | if (step_over_finished) |
87ce2a04 | 2795 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2796 | if (trace_event) |
87ce2a04 | 2797 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2798 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2799 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2800 | paddress (event_child->stop_pc), | |
2801 | paddress (event_child->step_range_start), | |
2802 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2803 | } |
2804 | ||
2805 | /* We're not reporting this breakpoint to GDB, so apply the | |
2806 | decr_pc_after_break adjustment to the inferior's regcache | |
2807 | ourselves. */ | |
2808 | ||
2809 | if (the_low_target.set_pc != NULL) | |
2810 | { | |
2811 | struct regcache *regcache | |
0bfdf32f | 2812 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
2813 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2814 | } | |
2815 | ||
7984d532 PA |
2816 | /* We may have finished stepping over a breakpoint. If so, |
2817 | we've stopped and suspended all LWPs momentarily except the | |
2818 | stepping one. This is where we resume them all again. We're | |
2819 | going to keep waiting, so use proceed, which handles stepping | |
2820 | over the next breakpoint. */ | |
6bf5e0ba | 2821 | if (debug_threads) |
87ce2a04 | 2822 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2823 | |
2824 | if (step_over_finished) | |
2825 | unsuspend_all_lwps (event_child); | |
2826 | ||
6bf5e0ba | 2827 | proceed_all_lwps (); |
582511be | 2828 | return ignore_event (ourstatus); |
6bf5e0ba PA |
2829 | } |
2830 | ||
2831 | if (debug_threads) | |
2832 | { | |
0bfdf32f | 2833 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
2834 | { |
2835 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2836 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2837 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2838 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2839 | } |
582511be | 2840 | if (event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 2841 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 2842 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2843 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2844 | if (debug_threads) |
87ce2a04 | 2845 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2846 | } |
2847 | ||
2848 | /* Alright, we're going to report a stop. */ | |
2849 | ||
582511be | 2850 | if (!stabilizing_threads) |
6bf5e0ba PA |
2851 | { |
2852 | /* In all-stop, stop all threads. */ | |
582511be PA |
2853 | if (!non_stop) |
2854 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
2855 | |
2856 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2857 | from among those that have had events. Giving equal priority | |
2858 | to all LWPs that have had events helps prevent | |
2859 | starvation. */ | |
2860 | if (ptid_equal (ptid, minus_one_ptid)) | |
2861 | { | |
2862 | event_child->status_pending_p = 1; | |
2863 | event_child->status_pending = w; | |
2864 | ||
2865 | select_event_lwp (&event_child); | |
2866 | ||
0bfdf32f GB |
2867 | /* current_thread and event_child must stay in sync. */ |
2868 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 2869 | |
6bf5e0ba PA |
2870 | event_child->status_pending_p = 0; |
2871 | w = event_child->status_pending; | |
2872 | } | |
2873 | ||
c03e6ccc | 2874 | if (step_over_finished) |
582511be PA |
2875 | { |
2876 | if (!non_stop) | |
2877 | { | |
2878 | /* If we were doing a step-over, all other threads but | |
2879 | the stepping one had been paused in start_step_over, | |
2880 | with their suspend counts incremented. We don't want | |
2881 | to do a full unstop/unpause, because we're in | |
2882 | all-stop mode (so we want threads stopped), but we | |
2883 | still need to unsuspend the other threads, to | |
2884 | decrement their `suspended' count back. */ | |
2885 | unsuspend_all_lwps (event_child); | |
2886 | } | |
2887 | else | |
2888 | { | |
2889 | /* If we just finished a step-over, then all threads had | |
2890 | been momentarily paused. In all-stop, that's fine, | |
2891 | we want threads stopped by now anyway. In non-stop, | |
2892 | we need to re-resume threads that GDB wanted to be | |
2893 | running. */ | |
2894 | unstop_all_lwps (1, event_child); | |
2895 | } | |
2896 | } | |
c03e6ccc | 2897 | |
fa593d66 | 2898 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
2899 | if (!non_stop) |
2900 | stabilize_threads (); | |
6bf5e0ba PA |
2901 | } |
2902 | else | |
2903 | { | |
2904 | /* If we just finished a step-over, then all threads had been | |
2905 | momentarily paused. In all-stop, that's fine, we want | |
2906 | threads stopped by now anyway. In non-stop, we need to | |
2907 | re-resume threads that GDB wanted to be running. */ | |
2908 | if (step_over_finished) | |
7984d532 | 2909 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2910 | } |
2911 | ||
5b1c542e | 2912 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2913 | |
582511be PA |
2914 | /* Now that we've selected our final event LWP, un-adjust its PC if |
2915 | it was a software breakpoint. */ | |
2916 | if (event_child->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT) | |
2917 | { | |
2918 | int decr_pc = the_low_target.decr_pc_after_break; | |
2919 | ||
2920 | if (decr_pc != 0) | |
2921 | { | |
2922 | struct regcache *regcache | |
2923 | = get_thread_regcache (current_thread, 1); | |
2924 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
2925 | } | |
2926 | } | |
2927 | ||
0bfdf32f | 2928 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2929 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
2930 | { |
2931 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2932 | and it stopped cleanly, so report as SIG0. The use of | |
2933 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2934 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2935 | } |
0bfdf32f | 2936 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2937 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
2938 | { |
2939 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2940 | but, it stopped for other reasons. */ |
2ea28649 | 2941 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2942 | } |
2943 | else | |
2944 | { | |
2ea28649 | 2945 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2946 | } |
2947 | ||
d50171e4 PA |
2948 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2949 | ||
bd99dc85 | 2950 | if (debug_threads) |
87ce2a04 DE |
2951 | { |
2952 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 2953 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
2954 | ourstatus->kind, ourstatus->value.sig); |
2955 | debug_exit (); | |
2956 | } | |
bd99dc85 | 2957 | |
0bfdf32f | 2958 | return ptid_of (current_thread); |
bd99dc85 PA |
2959 | } |
2960 | ||
2961 | /* Get rid of any pending event in the pipe. */ | |
2962 | static void | |
2963 | async_file_flush (void) | |
2964 | { | |
2965 | int ret; | |
2966 | char buf; | |
2967 | ||
2968 | do | |
2969 | ret = read (linux_event_pipe[0], &buf, 1); | |
2970 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2971 | } | |
2972 | ||
2973 | /* Put something in the pipe, so the event loop wakes up. */ | |
2974 | static void | |
2975 | async_file_mark (void) | |
2976 | { | |
2977 | int ret; | |
2978 | ||
2979 | async_file_flush (); | |
2980 | ||
2981 | do | |
2982 | ret = write (linux_event_pipe[1], "+", 1); | |
2983 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2984 | ||
2985 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2986 | be awakened anyway. */ | |
2987 | } | |
2988 | ||
95954743 PA |
2989 | static ptid_t |
2990 | linux_wait (ptid_t ptid, | |
2991 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2992 | { |
95954743 | 2993 | ptid_t event_ptid; |
bd99dc85 | 2994 | |
bd99dc85 PA |
2995 | /* Flush the async file first. */ |
2996 | if (target_is_async_p ()) | |
2997 | async_file_flush (); | |
2998 | ||
582511be PA |
2999 | do |
3000 | { | |
3001 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3002 | } | |
3003 | while ((target_options & TARGET_WNOHANG) == 0 | |
3004 | && ptid_equal (event_ptid, null_ptid) | |
3005 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3006 | |
3007 | /* If at least one stop was reported, there may be more. A single | |
3008 | SIGCHLD can signal more than one child stop. */ | |
3009 | if (target_is_async_p () | |
3010 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3011 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3012 | async_file_mark (); |
3013 | ||
3014 | return event_ptid; | |
da6d8c04 DJ |
3015 | } |
3016 | ||
c5f62d5f | 3017 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3018 | |
3019 | static int | |
a1928bad | 3020 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3021 | { |
c5f62d5f DE |
3022 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3023 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3024 | |
c5f62d5f DE |
3025 | #ifdef __NR_tkill |
3026 | { | |
3027 | static int tkill_failed; | |
fd500816 | 3028 | |
c5f62d5f DE |
3029 | if (!tkill_failed) |
3030 | { | |
3031 | int ret; | |
3032 | ||
3033 | errno = 0; | |
3034 | ret = syscall (__NR_tkill, lwpid, signo); | |
3035 | if (errno != ENOSYS) | |
3036 | return ret; | |
3037 | tkill_failed = 1; | |
3038 | } | |
3039 | } | |
fd500816 DJ |
3040 | #endif |
3041 | ||
3042 | return kill (lwpid, signo); | |
3043 | } | |
3044 | ||
964e4306 PA |
3045 | void |
3046 | linux_stop_lwp (struct lwp_info *lwp) | |
3047 | { | |
3048 | send_sigstop (lwp); | |
3049 | } | |
3050 | ||
0d62e5e8 | 3051 | static void |
02fc4de7 | 3052 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3053 | { |
bd99dc85 | 3054 | int pid; |
0d62e5e8 | 3055 | |
d86d4aaf | 3056 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3057 | |
0d62e5e8 DJ |
3058 | /* If we already have a pending stop signal for this process, don't |
3059 | send another. */ | |
54a0b537 | 3060 | if (lwp->stop_expected) |
0d62e5e8 | 3061 | { |
ae13219e | 3062 | if (debug_threads) |
87ce2a04 | 3063 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3064 | |
0d62e5e8 DJ |
3065 | return; |
3066 | } | |
3067 | ||
3068 | if (debug_threads) | |
87ce2a04 | 3069 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3070 | |
d50171e4 | 3071 | lwp->stop_expected = 1; |
bd99dc85 | 3072 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3073 | } |
3074 | ||
7984d532 PA |
3075 | static int |
3076 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3077 | { |
d86d4aaf DE |
3078 | struct thread_info *thread = (struct thread_info *) entry; |
3079 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3080 | |
7984d532 PA |
3081 | /* Ignore EXCEPT. */ |
3082 | if (lwp == except) | |
3083 | return 0; | |
3084 | ||
02fc4de7 | 3085 | if (lwp->stopped) |
7984d532 | 3086 | return 0; |
02fc4de7 PA |
3087 | |
3088 | send_sigstop (lwp); | |
7984d532 PA |
3089 | return 0; |
3090 | } | |
3091 | ||
3092 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3093 | yet. */ | |
3094 | static int | |
3095 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3096 | void *except) | |
3097 | { | |
d86d4aaf DE |
3098 | struct thread_info *thread = (struct thread_info *) entry; |
3099 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3100 | |
3101 | /* Ignore EXCEPT. */ | |
3102 | if (lwp == except) | |
3103 | return 0; | |
3104 | ||
3105 | lwp->suspended++; | |
3106 | ||
3107 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3108 | } |
3109 | ||
95954743 PA |
3110 | static void |
3111 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3112 | { | |
3113 | /* It's dead, really. */ | |
3114 | lwp->dead = 1; | |
3115 | ||
3116 | /* Store the exit status for later. */ | |
3117 | lwp->status_pending_p = 1; | |
3118 | lwp->status_pending = wstat; | |
3119 | ||
95954743 PA |
3120 | /* Prevent trying to stop it. */ |
3121 | lwp->stopped = 1; | |
3122 | ||
3123 | /* No further stops are expected from a dead lwp. */ | |
3124 | lwp->stop_expected = 0; | |
3125 | } | |
3126 | ||
fa96cb38 PA |
3127 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3128 | ||
0d62e5e8 | 3129 | static void |
fa96cb38 | 3130 | wait_for_sigstop (void) |
0d62e5e8 | 3131 | { |
0bfdf32f | 3132 | struct thread_info *saved_thread; |
95954743 | 3133 | ptid_t saved_tid; |
fa96cb38 PA |
3134 | int wstat; |
3135 | int ret; | |
0d62e5e8 | 3136 | |
0bfdf32f GB |
3137 | saved_thread = current_thread; |
3138 | if (saved_thread != NULL) | |
3139 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3140 | else |
95954743 | 3141 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3142 | |
d50171e4 | 3143 | if (debug_threads) |
fa96cb38 | 3144 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3145 | |
fa96cb38 PA |
3146 | /* Passing NULL_PTID as filter indicates we want all events to be |
3147 | left pending. Eventually this returns when there are no | |
3148 | unwaited-for children left. */ | |
3149 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3150 | &wstat, __WALL); | |
3151 | gdb_assert (ret == -1); | |
0d62e5e8 | 3152 | |
0bfdf32f GB |
3153 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3154 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3155 | else |
3156 | { | |
3157 | if (debug_threads) | |
87ce2a04 | 3158 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3159 | |
bd99dc85 PA |
3160 | if (non_stop) |
3161 | { | |
3162 | /* We can't change the current inferior behind GDB's back, | |
3163 | otherwise, a subsequent command may apply to the wrong | |
3164 | process. */ | |
0bfdf32f | 3165 | current_thread = NULL; |
bd99dc85 PA |
3166 | } |
3167 | else | |
3168 | { | |
3169 | /* Set a valid thread as current. */ | |
0bfdf32f | 3170 | set_desired_thread (0); |
bd99dc85 | 3171 | } |
0d62e5e8 DJ |
3172 | } |
3173 | } | |
3174 | ||
fa593d66 PA |
3175 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3176 | move it out, because we need to report the stop event to GDB. For | |
3177 | example, if the user puts a breakpoint in the jump pad, it's | |
3178 | because she wants to debug it. */ | |
3179 | ||
3180 | static int | |
3181 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3182 | { | |
d86d4aaf DE |
3183 | struct thread_info *thread = (struct thread_info *) entry; |
3184 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3185 | |
3186 | gdb_assert (lwp->suspended == 0); | |
3187 | gdb_assert (lwp->stopped); | |
3188 | ||
3189 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3190 | return (supports_fast_tracepoints () | |
58b4daa5 | 3191 | && agent_loaded_p () |
fa593d66 | 3192 | && (gdb_breakpoint_here (lwp->stop_pc) |
582511be | 3193 | || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3194 | || thread->last_resume_kind == resume_step) |
3195 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3196 | } | |
3197 | ||
3198 | static void | |
3199 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3200 | { | |
d86d4aaf DE |
3201 | struct thread_info *thread = (struct thread_info *) entry; |
3202 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3203 | int *wstat; |
3204 | ||
3205 | gdb_assert (lwp->suspended == 0); | |
3206 | gdb_assert (lwp->stopped); | |
3207 | ||
3208 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3209 | ||
3210 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3211 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
582511be | 3212 | && lwp->stop_reason != LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3213 | && thread->last_resume_kind != resume_step |
3214 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3215 | { | |
3216 | if (debug_threads) | |
87ce2a04 | 3217 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3218 | lwpid_of (thread)); |
fa593d66 PA |
3219 | |
3220 | if (wstat) | |
3221 | { | |
3222 | lwp->status_pending_p = 0; | |
3223 | enqueue_one_deferred_signal (lwp, wstat); | |
3224 | ||
3225 | if (debug_threads) | |
87ce2a04 DE |
3226 | debug_printf ("Signal %d for LWP %ld deferred " |
3227 | "(in jump pad)\n", | |
d86d4aaf | 3228 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3229 | } |
3230 | ||
3231 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3232 | } | |
3233 | else | |
3234 | lwp->suspended++; | |
3235 | } | |
3236 | ||
3237 | static int | |
3238 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3239 | { | |
d86d4aaf DE |
3240 | struct thread_info *thread = (struct thread_info *) entry; |
3241 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3242 | |
3243 | if (lwp->dead) | |
3244 | return 0; | |
3245 | if (lwp->stopped) | |
3246 | return 0; | |
3247 | return 1; | |
3248 | } | |
3249 | ||
7984d532 PA |
3250 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3251 | If SUSPEND, then also increase the suspend count of every LWP, | |
3252 | except EXCEPT. */ | |
3253 | ||
0d62e5e8 | 3254 | static void |
7984d532 | 3255 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3256 | { |
bde24c0a PA |
3257 | /* Should not be called recursively. */ |
3258 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3259 | ||
87ce2a04 DE |
3260 | if (debug_threads) |
3261 | { | |
3262 | debug_enter (); | |
3263 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3264 | suspend ? "stop-and-suspend" : "stop", | |
3265 | except != NULL | |
d86d4aaf | 3266 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3267 | : "none"); |
3268 | } | |
3269 | ||
bde24c0a PA |
3270 | stopping_threads = (suspend |
3271 | ? STOPPING_AND_SUSPENDING_THREADS | |
3272 | : STOPPING_THREADS); | |
7984d532 PA |
3273 | |
3274 | if (suspend) | |
d86d4aaf | 3275 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3276 | else |
d86d4aaf | 3277 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3278 | wait_for_sigstop (); |
bde24c0a | 3279 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3280 | |
3281 | if (debug_threads) | |
3282 | { | |
3283 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3284 | "back to !stopping\n"); | |
3285 | debug_exit (); | |
3286 | } | |
0d62e5e8 DJ |
3287 | } |
3288 | ||
da6d8c04 DJ |
3289 | /* Resume execution of the inferior process. |
3290 | If STEP is nonzero, single-step it. | |
3291 | If SIGNAL is nonzero, give it that signal. */ | |
3292 | ||
ce3a066d | 3293 | static void |
2acc282a | 3294 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3295 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3296 | { |
d86d4aaf | 3297 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3298 | struct thread_info *saved_thread; |
fa593d66 | 3299 | int fast_tp_collecting; |
0d62e5e8 | 3300 | |
54a0b537 | 3301 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3302 | return; |
3303 | ||
fa593d66 PA |
3304 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3305 | ||
3306 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3307 | ||
219f2f23 PA |
3308 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3309 | user used the "jump" command, or "set $pc = foo"). */ | |
3310 | if (lwp->stop_pc != get_pc (lwp)) | |
3311 | { | |
3312 | /* Collecting 'while-stepping' actions doesn't make sense | |
3313 | anymore. */ | |
d86d4aaf | 3314 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3315 | } |
3316 | ||
0d62e5e8 DJ |
3317 | /* If we have pending signals or status, and a new signal, enqueue the |
3318 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3319 | breakpoint; it will be picked up again below. */ | |
3320 | if (signal != 0 | |
fa593d66 PA |
3321 | && (lwp->status_pending_p |
3322 | || lwp->pending_signals != NULL | |
3323 | || lwp->bp_reinsert != 0 | |
3324 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3325 | { |
3326 | struct pending_signals *p_sig; | |
bca929d3 | 3327 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3328 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3329 | p_sig->signal = signal; |
32ca6d61 DJ |
3330 | if (info == NULL) |
3331 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3332 | else | |
3333 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3334 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3335 | } |
3336 | ||
d50171e4 PA |
3337 | if (lwp->status_pending_p) |
3338 | { | |
3339 | if (debug_threads) | |
87ce2a04 DE |
3340 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3341 | " has pending status\n", | |
d86d4aaf | 3342 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3343 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3344 | return; |
3345 | } | |
0d62e5e8 | 3346 | |
0bfdf32f GB |
3347 | saved_thread = current_thread; |
3348 | current_thread = thread; | |
0d62e5e8 DJ |
3349 | |
3350 | if (debug_threads) | |
87ce2a04 | 3351 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3352 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3353 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3354 | |
3355 | /* This bit needs some thinking about. If we get a signal that | |
3356 | we must report while a single-step reinsert is still pending, | |
3357 | we often end up resuming the thread. It might be better to | |
3358 | (ew) allow a stack of pending events; then we could be sure that | |
3359 | the reinsert happened right away and not lose any signals. | |
3360 | ||
3361 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3362 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3363 | complete correctness, so it won't solve that problem. It may be |
3364 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3365 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3366 | { |
3367 | if (debug_threads) | |
87ce2a04 DE |
3368 | debug_printf (" pending reinsert at 0x%s\n", |
3369 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3370 | |
85e00e85 | 3371 | if (can_hardware_single_step ()) |
d50171e4 | 3372 | { |
fa593d66 PA |
3373 | if (fast_tp_collecting == 0) |
3374 | { | |
3375 | if (step == 0) | |
3376 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3377 | if (lwp->suspended) | |
3378 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3379 | lwp->suspended); | |
3380 | } | |
d50171e4 PA |
3381 | |
3382 | step = 1; | |
3383 | } | |
0d62e5e8 DJ |
3384 | |
3385 | /* Postpone any pending signal. It was enqueued above. */ | |
3386 | signal = 0; | |
3387 | } | |
3388 | ||
fa593d66 PA |
3389 | if (fast_tp_collecting == 1) |
3390 | { | |
3391 | if (debug_threads) | |
87ce2a04 DE |
3392 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3393 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3394 | lwpid_of (thread)); |
fa593d66 PA |
3395 | |
3396 | /* Postpone any pending signal. It was enqueued above. */ | |
3397 | signal = 0; | |
3398 | } | |
3399 | else if (fast_tp_collecting == 2) | |
3400 | { | |
3401 | if (debug_threads) | |
87ce2a04 DE |
3402 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3403 | " single-stepping\n", | |
d86d4aaf | 3404 | lwpid_of (thread)); |
fa593d66 PA |
3405 | |
3406 | if (can_hardware_single_step ()) | |
3407 | step = 1; | |
3408 | else | |
38e08fca GB |
3409 | { |
3410 | internal_error (__FILE__, __LINE__, | |
3411 | "moving out of jump pad single-stepping" | |
3412 | " not implemented on this target"); | |
3413 | } | |
fa593d66 PA |
3414 | |
3415 | /* Postpone any pending signal. It was enqueued above. */ | |
3416 | signal = 0; | |
3417 | } | |
3418 | ||
219f2f23 PA |
3419 | /* If we have while-stepping actions in this thread set it stepping. |
3420 | If we have a signal to deliver, it may or may not be set to | |
3421 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3422 | while-stepping into a signal handler. A possible smart thing to | |
3423 | do would be to set an internal breakpoint at the signal return | |
3424 | address, continue, and carry on catching this while-stepping | |
3425 | action only when that breakpoint is hit. A future | |
3426 | enhancement. */ | |
d86d4aaf | 3427 | if (thread->while_stepping != NULL |
219f2f23 PA |
3428 | && can_hardware_single_step ()) |
3429 | { | |
3430 | if (debug_threads) | |
87ce2a04 | 3431 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3432 | lwpid_of (thread)); |
219f2f23 PA |
3433 | step = 1; |
3434 | } | |
3435 | ||
582511be | 3436 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3437 | { |
0bfdf32f | 3438 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3439 | |
3440 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3441 | ||
3442 | if (debug_threads) | |
3443 | { | |
3444 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3445 | (long) lwp->stop_pc); | |
3446 | } | |
0d62e5e8 DJ |
3447 | } |
3448 | ||
fa593d66 PA |
3449 | /* If we have pending signals, consume one unless we are trying to |
3450 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3451 | collect. */ | |
3452 | if (lwp->pending_signals != NULL | |
3453 | && lwp->bp_reinsert == 0 | |
3454 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3455 | { |
3456 | struct pending_signals **p_sig; | |
3457 | ||
54a0b537 | 3458 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3459 | while ((*p_sig)->prev != NULL) |
3460 | p_sig = &(*p_sig)->prev; | |
3461 | ||
3462 | signal = (*p_sig)->signal; | |
32ca6d61 | 3463 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3464 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3465 | &(*p_sig)->info); |
32ca6d61 | 3466 | |
0d62e5e8 DJ |
3467 | free (*p_sig); |
3468 | *p_sig = NULL; | |
3469 | } | |
3470 | ||
aa5ca48f DE |
3471 | if (the_low_target.prepare_to_resume != NULL) |
3472 | the_low_target.prepare_to_resume (lwp); | |
3473 | ||
d86d4aaf | 3474 | regcache_invalidate_thread (thread); |
da6d8c04 | 3475 | errno = 0; |
54a0b537 | 3476 | lwp->stopped = 0; |
582511be | 3477 | lwp->stop_reason = LWP_STOPPED_BY_NO_REASON; |
54a0b537 | 3478 | lwp->stepping = step; |
d86d4aaf | 3479 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3480 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3481 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3482 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3483 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3484 | |
0bfdf32f | 3485 | current_thread = saved_thread; |
da6d8c04 | 3486 | if (errno) |
3221518c UW |
3487 | { |
3488 | /* ESRCH from ptrace either means that the thread was already | |
3489 | running (an error) or that it is gone (a race condition). If | |
3490 | it's gone, we will get a notification the next time we wait, | |
3491 | so we can ignore the error. We could differentiate these | |
3492 | two, but it's tricky without waiting; the thread still exists | |
3493 | as a zombie, so sending it signal 0 would succeed. So just | |
3494 | ignore ESRCH. */ | |
3495 | if (errno == ESRCH) | |
3496 | return; | |
3497 | ||
3498 | perror_with_name ("ptrace"); | |
3499 | } | |
da6d8c04 DJ |
3500 | } |
3501 | ||
2bd7c093 PA |
3502 | struct thread_resume_array |
3503 | { | |
3504 | struct thread_resume *resume; | |
3505 | size_t n; | |
3506 | }; | |
64386c31 | 3507 | |
ebcf782c DE |
3508 | /* This function is called once per thread via find_inferior. |
3509 | ARG is a pointer to a thread_resume_array struct. | |
3510 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3511 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3512 | |
3513 | This algorithm is O(threads * resume elements), but resume elements | |
3514 | is small (and will remain small at least until GDB supports thread | |
3515 | suspension). */ | |
ebcf782c | 3516 | |
2bd7c093 PA |
3517 | static int |
3518 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3519 | { |
d86d4aaf DE |
3520 | struct thread_info *thread = (struct thread_info *) entry; |
3521 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3522 | int ndx; |
2bd7c093 | 3523 | struct thread_resume_array *r; |
64386c31 | 3524 | |
2bd7c093 | 3525 | r = arg; |
64386c31 | 3526 | |
2bd7c093 | 3527 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3528 | { |
3529 | ptid_t ptid = r->resume[ndx].thread; | |
3530 | if (ptid_equal (ptid, minus_one_ptid) | |
3531 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3532 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3533 | of PID'. */ | |
d86d4aaf | 3534 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3535 | && (ptid_is_pid (ptid) |
3536 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3537 | { |
d50171e4 | 3538 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3539 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3540 | { |
3541 | if (debug_threads) | |
87ce2a04 DE |
3542 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3543 | (thread->last_status.kind | |
3544 | == TARGET_WAITKIND_STOPPED) | |
3545 | ? "stopped" | |
3546 | : "stopping", | |
d86d4aaf | 3547 | lwpid_of (thread)); |
d50171e4 PA |
3548 | |
3549 | continue; | |
3550 | } | |
3551 | ||
95954743 | 3552 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3553 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3554 | |
c2d6af84 PA |
3555 | lwp->step_range_start = lwp->resume->step_range_start; |
3556 | lwp->step_range_end = lwp->resume->step_range_end; | |
3557 | ||
fa593d66 PA |
3558 | /* If we had a deferred signal to report, dequeue one now. |
3559 | This can happen if LWP gets more than one signal while | |
3560 | trying to get out of a jump pad. */ | |
3561 | if (lwp->stopped | |
3562 | && !lwp->status_pending_p | |
3563 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3564 | { | |
3565 | lwp->status_pending_p = 1; | |
3566 | ||
3567 | if (debug_threads) | |
87ce2a04 DE |
3568 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3569 | "leaving status pending.\n", | |
d86d4aaf DE |
3570 | WSTOPSIG (lwp->status_pending), |
3571 | lwpid_of (thread)); | |
fa593d66 PA |
3572 | } |
3573 | ||
95954743 PA |
3574 | return 0; |
3575 | } | |
3576 | } | |
2bd7c093 PA |
3577 | |
3578 | /* No resume action for this thread. */ | |
3579 | lwp->resume = NULL; | |
64386c31 | 3580 | |
2bd7c093 | 3581 | return 0; |
5544ad89 DJ |
3582 | } |
3583 | ||
20ad9378 DE |
3584 | /* find_inferior callback for linux_resume. |
3585 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3586 | |
bd99dc85 PA |
3587 | static int |
3588 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3589 | { |
d86d4aaf DE |
3590 | struct thread_info *thread = (struct thread_info *) entry; |
3591 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3592 | |
bd99dc85 PA |
3593 | /* LWPs which will not be resumed are not interesting, because |
3594 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3595 | if (lwp->resume == NULL) |
bd99dc85 | 3596 | return 0; |
64386c31 | 3597 | |
582511be | 3598 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
3599 | * (int *) flag_p = 1; |
3600 | ||
3601 | return 0; | |
3602 | } | |
3603 | ||
3604 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3605 | internal breakpoint that we need to step over. It assumes that any | |
3606 | required STOP_PC adjustment has already been propagated to the | |
3607 | inferior's regcache. */ | |
3608 | ||
3609 | static int | |
3610 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3611 | { | |
d86d4aaf DE |
3612 | struct thread_info *thread = (struct thread_info *) entry; |
3613 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 3614 | struct thread_info *saved_thread; |
d50171e4 PA |
3615 | CORE_ADDR pc; |
3616 | ||
3617 | /* LWPs which will not be resumed are not interesting, because we | |
3618 | might not wait for them next time through linux_wait. */ | |
3619 | ||
3620 | if (!lwp->stopped) | |
3621 | { | |
3622 | if (debug_threads) | |
87ce2a04 | 3623 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3624 | lwpid_of (thread)); |
d50171e4 PA |
3625 | return 0; |
3626 | } | |
3627 | ||
8336d594 | 3628 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3629 | { |
3630 | if (debug_threads) | |
87ce2a04 DE |
3631 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3632 | " stopped\n", | |
d86d4aaf | 3633 | lwpid_of (thread)); |
d50171e4 PA |
3634 | return 0; |
3635 | } | |
3636 | ||
7984d532 PA |
3637 | gdb_assert (lwp->suspended >= 0); |
3638 | ||
3639 | if (lwp->suspended) | |
3640 | { | |
3641 | if (debug_threads) | |
87ce2a04 | 3642 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3643 | lwpid_of (thread)); |
7984d532 PA |
3644 | return 0; |
3645 | } | |
3646 | ||
d50171e4 PA |
3647 | if (!lwp->need_step_over) |
3648 | { | |
3649 | if (debug_threads) | |
d86d4aaf | 3650 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3651 | } |
5544ad89 | 3652 | |
bd99dc85 | 3653 | if (lwp->status_pending_p) |
d50171e4 PA |
3654 | { |
3655 | if (debug_threads) | |
87ce2a04 DE |
3656 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3657 | " status.\n", | |
d86d4aaf | 3658 | lwpid_of (thread)); |
d50171e4 PA |
3659 | return 0; |
3660 | } | |
3661 | ||
3662 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3663 | or we have. */ | |
3664 | pc = get_pc (lwp); | |
3665 | ||
3666 | /* If the PC has changed since we stopped, then don't do anything, | |
3667 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3668 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3669 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3670 | command, or poked thread's registers herself. */ | |
3671 | if (pc != lwp->stop_pc) | |
3672 | { | |
3673 | if (debug_threads) | |
87ce2a04 DE |
3674 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3675 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3676 | lwpid_of (thread), |
3677 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3678 | |
3679 | lwp->need_step_over = 0; | |
3680 | return 0; | |
3681 | } | |
3682 | ||
0bfdf32f GB |
3683 | saved_thread = current_thread; |
3684 | current_thread = thread; | |
d50171e4 | 3685 | |
8b07ae33 | 3686 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3687 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3688 | { |
8b07ae33 | 3689 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3690 | though. If the condition is being evaluated on the target's side |
3691 | and it evaluate to false, step over this breakpoint as well. */ | |
3692 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3693 | && gdb_condition_true_at_breakpoint (pc) |
3694 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3695 | { |
3696 | if (debug_threads) | |
87ce2a04 DE |
3697 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3698 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3699 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3700 | |
0bfdf32f | 3701 | current_thread = saved_thread; |
8b07ae33 PA |
3702 | return 0; |
3703 | } | |
3704 | else | |
3705 | { | |
3706 | if (debug_threads) | |
87ce2a04 DE |
3707 | debug_printf ("Need step over [LWP %ld]? yes, " |
3708 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3709 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3710 | |
8b07ae33 PA |
3711 | /* We've found an lwp that needs stepping over --- return 1 so |
3712 | that find_inferior stops looking. */ | |
0bfdf32f | 3713 | current_thread = saved_thread; |
8b07ae33 PA |
3714 | |
3715 | /* If the step over is cancelled, this is set again. */ | |
3716 | lwp->need_step_over = 0; | |
3717 | return 1; | |
3718 | } | |
d50171e4 PA |
3719 | } |
3720 | ||
0bfdf32f | 3721 | current_thread = saved_thread; |
d50171e4 PA |
3722 | |
3723 | if (debug_threads) | |
87ce2a04 DE |
3724 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3725 | " at 0x%s\n", | |
d86d4aaf | 3726 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3727 | |
bd99dc85 | 3728 | return 0; |
5544ad89 DJ |
3729 | } |
3730 | ||
d50171e4 PA |
3731 | /* Start a step-over operation on LWP. When LWP stopped at a |
3732 | breakpoint, to make progress, we need to remove the breakpoint out | |
3733 | of the way. If we let other threads run while we do that, they may | |
3734 | pass by the breakpoint location and miss hitting it. To avoid | |
3735 | that, a step-over momentarily stops all threads while LWP is | |
3736 | single-stepped while the breakpoint is temporarily uninserted from | |
3737 | the inferior. When the single-step finishes, we reinsert the | |
3738 | breakpoint, and let all threads that are supposed to be running, | |
3739 | run again. | |
3740 | ||
3741 | On targets that don't support hardware single-step, we don't | |
3742 | currently support full software single-stepping. Instead, we only | |
3743 | support stepping over the thread event breakpoint, by asking the | |
3744 | low target where to place a reinsert breakpoint. Since this | |
3745 | routine assumes the breakpoint being stepped over is a thread event | |
3746 | breakpoint, it usually assumes the return address of the current | |
3747 | function is a good enough place to set the reinsert breakpoint. */ | |
3748 | ||
3749 | static int | |
3750 | start_step_over (struct lwp_info *lwp) | |
3751 | { | |
d86d4aaf | 3752 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3753 | struct thread_info *saved_thread; |
d50171e4 PA |
3754 | CORE_ADDR pc; |
3755 | int step; | |
3756 | ||
3757 | if (debug_threads) | |
87ce2a04 | 3758 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3759 | lwpid_of (thread)); |
d50171e4 | 3760 | |
7984d532 PA |
3761 | stop_all_lwps (1, lwp); |
3762 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3763 | |
3764 | if (debug_threads) | |
87ce2a04 | 3765 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3766 | |
3767 | /* Note, we should always reach here with an already adjusted PC, | |
3768 | either by GDB (if we're resuming due to GDB's request), or by our | |
3769 | caller, if we just finished handling an internal breakpoint GDB | |
3770 | shouldn't care about. */ | |
3771 | pc = get_pc (lwp); | |
3772 | ||
0bfdf32f GB |
3773 | saved_thread = current_thread; |
3774 | current_thread = thread; | |
d50171e4 PA |
3775 | |
3776 | lwp->bp_reinsert = pc; | |
3777 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3778 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3779 | |
3780 | if (can_hardware_single_step ()) | |
3781 | { | |
3782 | step = 1; | |
3783 | } | |
3784 | else | |
3785 | { | |
3786 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3787 | set_reinsert_breakpoint (raddr); | |
3788 | step = 0; | |
3789 | } | |
3790 | ||
0bfdf32f | 3791 | current_thread = saved_thread; |
d50171e4 PA |
3792 | |
3793 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3794 | ||
3795 | /* Require next event from this LWP. */ | |
d86d4aaf | 3796 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3797 | return 1; |
3798 | } | |
3799 | ||
3800 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3801 | start_step_over, if still there, and delete any reinsert | |
3802 | breakpoints we've set, on non hardware single-step targets. */ | |
3803 | ||
3804 | static int | |
3805 | finish_step_over (struct lwp_info *lwp) | |
3806 | { | |
3807 | if (lwp->bp_reinsert != 0) | |
3808 | { | |
3809 | if (debug_threads) | |
87ce2a04 | 3810 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3811 | |
3812 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3813 | may be no breakpoint to reinsert there by now. */ | |
3814 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3815 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3816 | |
3817 | lwp->bp_reinsert = 0; | |
3818 | ||
3819 | /* Delete any software-single-step reinsert breakpoints. No | |
3820 | longer needed. We don't have to worry about other threads | |
3821 | hitting this trap, and later not being able to explain it, | |
3822 | because we were stepping over a breakpoint, and we hold all | |
3823 | threads but LWP stopped while doing that. */ | |
3824 | if (!can_hardware_single_step ()) | |
3825 | delete_reinsert_breakpoints (); | |
3826 | ||
3827 | step_over_bkpt = null_ptid; | |
3828 | return 1; | |
3829 | } | |
3830 | else | |
3831 | return 0; | |
3832 | } | |
3833 | ||
5544ad89 DJ |
3834 | /* This function is called once per thread. We check the thread's resume |
3835 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3836 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3837 | |
bd99dc85 PA |
3838 | For threads which we aren't explicitly told otherwise, we preserve |
3839 | the stepping flag; this is used for stepping over gdbserver-placed | |
3840 | breakpoints. | |
3841 | ||
3842 | If pending_flags was set in any thread, we queue any needed | |
3843 | signals, since we won't actually resume. We already have a pending | |
3844 | event to report, so we don't need to preserve any step requests; | |
3845 | they should be re-issued if necessary. */ | |
3846 | ||
3847 | static int | |
3848 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3849 | { |
d86d4aaf DE |
3850 | struct thread_info *thread = (struct thread_info *) entry; |
3851 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3852 | int step; |
d50171e4 PA |
3853 | int leave_all_stopped = * (int *) arg; |
3854 | int leave_pending; | |
5544ad89 | 3855 | |
2bd7c093 | 3856 | if (lwp->resume == NULL) |
bd99dc85 | 3857 | return 0; |
5544ad89 | 3858 | |
bd99dc85 | 3859 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3860 | { |
bd99dc85 | 3861 | if (debug_threads) |
d86d4aaf | 3862 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3863 | |
3864 | if (!lwp->stopped) | |
3865 | { | |
3866 | if (debug_threads) | |
d86d4aaf | 3867 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3868 | |
d50171e4 PA |
3869 | /* Stop the thread, and wait for the event asynchronously, |
3870 | through the event loop. */ | |
02fc4de7 | 3871 | send_sigstop (lwp); |
bd99dc85 PA |
3872 | } |
3873 | else | |
3874 | { | |
3875 | if (debug_threads) | |
87ce2a04 | 3876 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3877 | lwpid_of (thread)); |
d50171e4 PA |
3878 | |
3879 | /* The LWP may have been stopped in an internal event that | |
3880 | was not meant to be notified back to GDB (e.g., gdbserver | |
3881 | breakpoint), so we should be reporting a stop event in | |
3882 | this case too. */ | |
3883 | ||
3884 | /* If the thread already has a pending SIGSTOP, this is a | |
3885 | no-op. Otherwise, something later will presumably resume | |
3886 | the thread and this will cause it to cancel any pending | |
3887 | operation, due to last_resume_kind == resume_stop. If | |
3888 | the thread already has a pending status to report, we | |
3889 | will still report it the next time we wait - see | |
3890 | status_pending_p_callback. */ | |
1a981360 PA |
3891 | |
3892 | /* If we already have a pending signal to report, then | |
3893 | there's no need to queue a SIGSTOP, as this means we're | |
3894 | midway through moving the LWP out of the jumppad, and we | |
3895 | will report the pending signal as soon as that is | |
3896 | finished. */ | |
3897 | if (lwp->pending_signals_to_report == NULL) | |
3898 | send_sigstop (lwp); | |
bd99dc85 | 3899 | } |
32ca6d61 | 3900 | |
bd99dc85 PA |
3901 | /* For stop requests, we're done. */ |
3902 | lwp->resume = NULL; | |
fc7238bb | 3903 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3904 | return 0; |
5544ad89 DJ |
3905 | } |
3906 | ||
bd99dc85 PA |
3907 | /* If this thread which is about to be resumed has a pending status, |
3908 | then don't resume any threads - we can just report the pending | |
3909 | status. Make sure to queue any signals that would otherwise be | |
3910 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3911 | thread has a pending status. If there's a thread that needs the |
3912 | step-over-breakpoint dance, then don't resume any other thread | |
3913 | but that particular one. */ | |
3914 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3915 | |
d50171e4 | 3916 | if (!leave_pending) |
bd99dc85 PA |
3917 | { |
3918 | if (debug_threads) | |
d86d4aaf | 3919 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3920 | |
d50171e4 | 3921 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3922 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3923 | } |
3924 | else | |
3925 | { | |
3926 | if (debug_threads) | |
d86d4aaf | 3927 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3928 | |
bd99dc85 PA |
3929 | /* If we have a new signal, enqueue the signal. */ |
3930 | if (lwp->resume->sig != 0) | |
3931 | { | |
3932 | struct pending_signals *p_sig; | |
3933 | p_sig = xmalloc (sizeof (*p_sig)); | |
3934 | p_sig->prev = lwp->pending_signals; | |
3935 | p_sig->signal = lwp->resume->sig; | |
3936 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3937 | ||
3938 | /* If this is the same signal we were previously stopped by, | |
3939 | make sure to queue its siginfo. We can ignore the return | |
3940 | value of ptrace; if it fails, we'll skip | |
3941 | PTRACE_SETSIGINFO. */ | |
3942 | if (WIFSTOPPED (lwp->last_status) | |
3943 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3944 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3945 | &p_sig->info); |
bd99dc85 PA |
3946 | |
3947 | lwp->pending_signals = p_sig; | |
3948 | } | |
3949 | } | |
5544ad89 | 3950 | |
fc7238bb | 3951 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3952 | lwp->resume = NULL; |
5544ad89 | 3953 | return 0; |
0d62e5e8 DJ |
3954 | } |
3955 | ||
3956 | static void | |
2bd7c093 | 3957 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3958 | { |
2bd7c093 | 3959 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3960 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3961 | int any_pending; |
3962 | int leave_all_stopped; | |
c6ecbae5 | 3963 | |
87ce2a04 DE |
3964 | if (debug_threads) |
3965 | { | |
3966 | debug_enter (); | |
3967 | debug_printf ("linux_resume:\n"); | |
3968 | } | |
3969 | ||
2bd7c093 | 3970 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3971 | |
d50171e4 PA |
3972 | /* If there is a thread which would otherwise be resumed, which has |
3973 | a pending status, then don't resume any threads - we can just | |
3974 | report the pending status. Make sure to queue any signals that | |
3975 | would otherwise be sent. In non-stop mode, we'll apply this | |
3976 | logic to each thread individually. We consume all pending events | |
3977 | before considering to start a step-over (in all-stop). */ | |
3978 | any_pending = 0; | |
bd99dc85 | 3979 | if (!non_stop) |
d86d4aaf | 3980 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
3981 | |
3982 | /* If there is a thread which would otherwise be resumed, which is | |
3983 | stopped at a breakpoint that needs stepping over, then don't | |
3984 | resume any threads - have it step over the breakpoint with all | |
3985 | other threads stopped, then resume all threads again. Make sure | |
3986 | to queue any signals that would otherwise be delivered or | |
3987 | queued. */ | |
3988 | if (!any_pending && supports_breakpoints ()) | |
3989 | need_step_over | |
d86d4aaf DE |
3990 | = (struct thread_info *) find_inferior (&all_threads, |
3991 | need_step_over_p, NULL); | |
d50171e4 PA |
3992 | |
3993 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3994 | ||
3995 | if (debug_threads) | |
3996 | { | |
3997 | if (need_step_over != NULL) | |
87ce2a04 | 3998 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 3999 | else if (any_pending) |
87ce2a04 DE |
4000 | debug_printf ("Not resuming, all-stop and found " |
4001 | "an LWP with pending status\n"); | |
d50171e4 | 4002 | else |
87ce2a04 | 4003 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4004 | } |
4005 | ||
4006 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4007 | otherwise deliver. */ | |
4008 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4009 | ||
4010 | if (need_step_over) | |
d86d4aaf | 4011 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4012 | |
4013 | if (debug_threads) | |
4014 | { | |
4015 | debug_printf ("linux_resume done\n"); | |
4016 | debug_exit (); | |
4017 | } | |
d50171e4 PA |
4018 | } |
4019 | ||
4020 | /* This function is called once per thread. We check the thread's | |
4021 | last resume request, which will tell us whether to resume, step, or | |
4022 | leave the thread stopped. Any signal the client requested to be | |
4023 | delivered has already been enqueued at this point. | |
4024 | ||
4025 | If any thread that GDB wants running is stopped at an internal | |
4026 | breakpoint that needs stepping over, we start a step-over operation | |
4027 | on that particular thread, and leave all others stopped. */ | |
4028 | ||
7984d532 PA |
4029 | static int |
4030 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4031 | { |
d86d4aaf DE |
4032 | struct thread_info *thread = (struct thread_info *) entry; |
4033 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4034 | int step; |
4035 | ||
7984d532 PA |
4036 | if (lwp == except) |
4037 | return 0; | |
d50171e4 PA |
4038 | |
4039 | if (debug_threads) | |
d86d4aaf | 4040 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4041 | |
4042 | if (!lwp->stopped) | |
4043 | { | |
4044 | if (debug_threads) | |
d86d4aaf | 4045 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4046 | return 0; |
d50171e4 PA |
4047 | } |
4048 | ||
02fc4de7 PA |
4049 | if (thread->last_resume_kind == resume_stop |
4050 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4051 | { |
4052 | if (debug_threads) | |
87ce2a04 | 4053 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4054 | lwpid_of (thread)); |
7984d532 | 4055 | return 0; |
d50171e4 PA |
4056 | } |
4057 | ||
4058 | if (lwp->status_pending_p) | |
4059 | { | |
4060 | if (debug_threads) | |
87ce2a04 | 4061 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4062 | lwpid_of (thread)); |
7984d532 | 4063 | return 0; |
d50171e4 PA |
4064 | } |
4065 | ||
7984d532 PA |
4066 | gdb_assert (lwp->suspended >= 0); |
4067 | ||
d50171e4 PA |
4068 | if (lwp->suspended) |
4069 | { | |
4070 | if (debug_threads) | |
d86d4aaf | 4071 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4072 | return 0; |
d50171e4 PA |
4073 | } |
4074 | ||
1a981360 PA |
4075 | if (thread->last_resume_kind == resume_stop |
4076 | && lwp->pending_signals_to_report == NULL | |
4077 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4078 | { |
4079 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4080 | last_status.kind check above would catch it, and we wouldn't | |
4081 | reach here. This LWP may have been momentarily paused by a | |
4082 | stop_all_lwps call while handling for example, another LWP's | |
4083 | step-over. In that case, the pending expected SIGSTOP signal | |
4084 | that was queued at vCont;t handling time will have already | |
4085 | been consumed by wait_for_sigstop, and so we need to requeue | |
4086 | another one here. Note that if the LWP already has a SIGSTOP | |
4087 | pending, this is a no-op. */ | |
4088 | ||
4089 | if (debug_threads) | |
87ce2a04 DE |
4090 | debug_printf ("Client wants LWP %ld to stop. " |
4091 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4092 | lwpid_of (thread)); |
02fc4de7 PA |
4093 | |
4094 | send_sigstop (lwp); | |
4095 | } | |
4096 | ||
8336d594 | 4097 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4098 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4099 | return 0; |
4100 | } | |
4101 | ||
4102 | static int | |
4103 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4104 | { | |
d86d4aaf DE |
4105 | struct thread_info *thread = (struct thread_info *) entry; |
4106 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4107 | |
4108 | if (lwp == except) | |
4109 | return 0; | |
4110 | ||
4111 | lwp->suspended--; | |
4112 | gdb_assert (lwp->suspended >= 0); | |
4113 | ||
4114 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4115 | } |
4116 | ||
4117 | /* When we finish a step-over, set threads running again. If there's | |
4118 | another thread that may need a step-over, now's the time to start | |
4119 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4120 | ||
4121 | static void | |
4122 | proceed_all_lwps (void) | |
4123 | { | |
d86d4aaf | 4124 | struct thread_info *need_step_over; |
d50171e4 PA |
4125 | |
4126 | /* If there is a thread which would otherwise be resumed, which is | |
4127 | stopped at a breakpoint that needs stepping over, then don't | |
4128 | resume any threads - have it step over the breakpoint with all | |
4129 | other threads stopped, then resume all threads again. */ | |
4130 | ||
4131 | if (supports_breakpoints ()) | |
4132 | { | |
4133 | need_step_over | |
d86d4aaf DE |
4134 | = (struct thread_info *) find_inferior (&all_threads, |
4135 | need_step_over_p, NULL); | |
d50171e4 PA |
4136 | |
4137 | if (need_step_over != NULL) | |
4138 | { | |
4139 | if (debug_threads) | |
87ce2a04 DE |
4140 | debug_printf ("proceed_all_lwps: found " |
4141 | "thread %ld needing a step-over\n", | |
4142 | lwpid_of (need_step_over)); | |
d50171e4 | 4143 | |
d86d4aaf | 4144 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4145 | return; |
4146 | } | |
4147 | } | |
5544ad89 | 4148 | |
d50171e4 | 4149 | if (debug_threads) |
87ce2a04 | 4150 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4151 | |
d86d4aaf | 4152 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4153 | } |
4154 | ||
4155 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4156 | pending statuses, are set to run again, except for EXCEPT, if not | |
4157 | NULL. This undoes a stop_all_lwps call. */ | |
4158 | ||
4159 | static void | |
7984d532 | 4160 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4161 | { |
5544ad89 DJ |
4162 | if (debug_threads) |
4163 | { | |
87ce2a04 | 4164 | debug_enter (); |
d50171e4 | 4165 | if (except) |
87ce2a04 | 4166 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4167 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4168 | else |
87ce2a04 | 4169 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4170 | } |
4171 | ||
7984d532 | 4172 | if (unsuspend) |
d86d4aaf | 4173 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4174 | else |
d86d4aaf | 4175 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4176 | |
4177 | if (debug_threads) | |
4178 | { | |
4179 | debug_printf ("unstop_all_lwps done\n"); | |
4180 | debug_exit (); | |
4181 | } | |
0d62e5e8 DJ |
4182 | } |
4183 | ||
58caa3dc DJ |
4184 | |
4185 | #ifdef HAVE_LINUX_REGSETS | |
4186 | ||
1faeff08 MR |
4187 | #define use_linux_regsets 1 |
4188 | ||
030031ee PA |
4189 | /* Returns true if REGSET has been disabled. */ |
4190 | ||
4191 | static int | |
4192 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4193 | { | |
4194 | return (info->disabled_regsets != NULL | |
4195 | && info->disabled_regsets[regset - info->regsets]); | |
4196 | } | |
4197 | ||
4198 | /* Disable REGSET. */ | |
4199 | ||
4200 | static void | |
4201 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4202 | { | |
4203 | int dr_offset; | |
4204 | ||
4205 | dr_offset = regset - info->regsets; | |
4206 | if (info->disabled_regsets == NULL) | |
4207 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4208 | info->disabled_regsets[dr_offset] = 1; | |
4209 | } | |
4210 | ||
58caa3dc | 4211 | static int |
3aee8918 PA |
4212 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4213 | struct regcache *regcache) | |
58caa3dc DJ |
4214 | { |
4215 | struct regset_info *regset; | |
e9d25b98 | 4216 | int saw_general_regs = 0; |
95954743 | 4217 | int pid; |
1570b33e | 4218 | struct iovec iov; |
58caa3dc | 4219 | |
0bfdf32f | 4220 | pid = lwpid_of (current_thread); |
28eef672 | 4221 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4222 | { |
1570b33e L |
4223 | void *buf, *data; |
4224 | int nt_type, res; | |
58caa3dc | 4225 | |
030031ee | 4226 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4227 | continue; |
58caa3dc | 4228 | |
bca929d3 | 4229 | buf = xmalloc (regset->size); |
1570b33e L |
4230 | |
4231 | nt_type = regset->nt_type; | |
4232 | if (nt_type) | |
4233 | { | |
4234 | iov.iov_base = buf; | |
4235 | iov.iov_len = regset->size; | |
4236 | data = (void *) &iov; | |
4237 | } | |
4238 | else | |
4239 | data = buf; | |
4240 | ||
dfb64f85 | 4241 | #ifndef __sparc__ |
f15f9948 | 4242 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4243 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4244 | #else |
1570b33e | 4245 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4246 | #endif |
58caa3dc DJ |
4247 | if (res < 0) |
4248 | { | |
4249 | if (errno == EIO) | |
4250 | { | |
52fa2412 | 4251 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4252 | this process mode. */ |
030031ee | 4253 | disable_regset (regsets_info, regset); |
58caa3dc | 4254 | } |
e5a9158d AA |
4255 | else if (errno == ENODATA) |
4256 | { | |
4257 | /* ENODATA may be returned if the regset is currently | |
4258 | not "active". This can happen in normal operation, | |
4259 | so suppress the warning in this case. */ | |
4260 | } | |
58caa3dc DJ |
4261 | else |
4262 | { | |
0d62e5e8 | 4263 | char s[256]; |
95954743 PA |
4264 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4265 | pid); | |
0d62e5e8 | 4266 | perror (s); |
58caa3dc DJ |
4267 | } |
4268 | } | |
098dbe61 AA |
4269 | else |
4270 | { | |
4271 | if (regset->type == GENERAL_REGS) | |
4272 | saw_general_regs = 1; | |
4273 | regset->store_function (regcache, buf); | |
4274 | } | |
fdeb2a12 | 4275 | free (buf); |
58caa3dc | 4276 | } |
e9d25b98 DJ |
4277 | if (saw_general_regs) |
4278 | return 0; | |
4279 | else | |
4280 | return 1; | |
58caa3dc DJ |
4281 | } |
4282 | ||
4283 | static int | |
3aee8918 PA |
4284 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4285 | struct regcache *regcache) | |
58caa3dc DJ |
4286 | { |
4287 | struct regset_info *regset; | |
e9d25b98 | 4288 | int saw_general_regs = 0; |
95954743 | 4289 | int pid; |
1570b33e | 4290 | struct iovec iov; |
58caa3dc | 4291 | |
0bfdf32f | 4292 | pid = lwpid_of (current_thread); |
28eef672 | 4293 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4294 | { |
1570b33e L |
4295 | void *buf, *data; |
4296 | int nt_type, res; | |
58caa3dc | 4297 | |
feea5f36 AA |
4298 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4299 | || regset->fill_function == NULL) | |
28eef672 | 4300 | continue; |
58caa3dc | 4301 | |
bca929d3 | 4302 | buf = xmalloc (regset->size); |
545587ee DJ |
4303 | |
4304 | /* First fill the buffer with the current register set contents, | |
4305 | in case there are any items in the kernel's regset that are | |
4306 | not in gdbserver's regcache. */ | |
1570b33e L |
4307 | |
4308 | nt_type = regset->nt_type; | |
4309 | if (nt_type) | |
4310 | { | |
4311 | iov.iov_base = buf; | |
4312 | iov.iov_len = regset->size; | |
4313 | data = (void *) &iov; | |
4314 | } | |
4315 | else | |
4316 | data = buf; | |
4317 | ||
dfb64f85 | 4318 | #ifndef __sparc__ |
f15f9948 | 4319 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4320 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4321 | #else |
689cc2ae | 4322 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4323 | #endif |
545587ee DJ |
4324 | |
4325 | if (res == 0) | |
4326 | { | |
4327 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4328 | regset->fill_function (regcache, buf); |
545587ee DJ |
4329 | |
4330 | /* Only now do we write the register set. */ | |
dfb64f85 | 4331 | #ifndef __sparc__ |
f15f9948 | 4332 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4333 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4334 | #else |
1570b33e | 4335 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4336 | #endif |
545587ee DJ |
4337 | } |
4338 | ||
58caa3dc DJ |
4339 | if (res < 0) |
4340 | { | |
4341 | if (errno == EIO) | |
4342 | { | |
52fa2412 | 4343 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4344 | this process mode. */ |
030031ee | 4345 | disable_regset (regsets_info, regset); |
58caa3dc | 4346 | } |
3221518c UW |
4347 | else if (errno == ESRCH) |
4348 | { | |
1b3f6016 PA |
4349 | /* At this point, ESRCH should mean the process is |
4350 | already gone, in which case we simply ignore attempts | |
4351 | to change its registers. See also the related | |
4352 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4353 | free (buf); |
3221518c UW |
4354 | return 0; |
4355 | } | |
58caa3dc DJ |
4356 | else |
4357 | { | |
ce3a066d | 4358 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4359 | } |
4360 | } | |
e9d25b98 DJ |
4361 | else if (regset->type == GENERAL_REGS) |
4362 | saw_general_regs = 1; | |
09ec9b38 | 4363 | free (buf); |
58caa3dc | 4364 | } |
e9d25b98 DJ |
4365 | if (saw_general_regs) |
4366 | return 0; | |
4367 | else | |
4368 | return 1; | |
58caa3dc DJ |
4369 | } |
4370 | ||
1faeff08 | 4371 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4372 | |
1faeff08 | 4373 | #define use_linux_regsets 0 |
3aee8918 PA |
4374 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4375 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4376 | |
58caa3dc | 4377 | #endif |
1faeff08 MR |
4378 | |
4379 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4380 | calls or 0 if it has to be transferred individually. */ | |
4381 | ||
4382 | static int | |
3aee8918 | 4383 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4384 | { |
4385 | unsigned char mask = 1 << (regno % 8); | |
4386 | size_t index = regno / 8; | |
4387 | ||
4388 | return (use_linux_regsets | |
3aee8918 PA |
4389 | && (regs_info->regset_bitmap == NULL |
4390 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4391 | } |
4392 | ||
58caa3dc | 4393 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4394 | |
4395 | int | |
3aee8918 | 4396 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4397 | { |
4398 | int addr; | |
4399 | ||
3aee8918 | 4400 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4401 | error ("Invalid register number %d.", regnum); |
4402 | ||
3aee8918 | 4403 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4404 | |
4405 | return addr; | |
4406 | } | |
4407 | ||
4408 | /* Fetch one register. */ | |
4409 | static void | |
3aee8918 PA |
4410 | fetch_register (const struct usrregs_info *usrregs, |
4411 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4412 | { |
4413 | CORE_ADDR regaddr; | |
4414 | int i, size; | |
4415 | char *buf; | |
4416 | int pid; | |
4417 | ||
3aee8918 | 4418 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4419 | return; |
4420 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4421 | return; | |
4422 | ||
3aee8918 | 4423 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4424 | if (regaddr == -1) |
4425 | return; | |
4426 | ||
3aee8918 PA |
4427 | size = ((register_size (regcache->tdesc, regno) |
4428 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4429 | & -sizeof (PTRACE_XFER_TYPE)); |
4430 | buf = alloca (size); | |
4431 | ||
0bfdf32f | 4432 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4433 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4434 | { | |
4435 | errno = 0; | |
4436 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4437 | ptrace (PTRACE_PEEKUSER, pid, | |
4438 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4439 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4440 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4441 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4442 | if (errno != 0) | |
4443 | error ("reading register %d: %s", regno, strerror (errno)); | |
4444 | } | |
4445 | ||
4446 | if (the_low_target.supply_ptrace_register) | |
4447 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4448 | else | |
4449 | supply_register (regcache, regno, buf); | |
4450 | } | |
4451 | ||
4452 | /* Store one register. */ | |
4453 | static void | |
3aee8918 PA |
4454 | store_register (const struct usrregs_info *usrregs, |
4455 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4456 | { |
4457 | CORE_ADDR regaddr; | |
4458 | int i, size; | |
4459 | char *buf; | |
4460 | int pid; | |
4461 | ||
3aee8918 | 4462 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4463 | return; |
4464 | if ((*the_low_target.cannot_store_register) (regno)) | |
4465 | return; | |
4466 | ||
3aee8918 | 4467 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4468 | if (regaddr == -1) |
4469 | return; | |
4470 | ||
3aee8918 PA |
4471 | size = ((register_size (regcache->tdesc, regno) |
4472 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4473 | & -sizeof (PTRACE_XFER_TYPE)); |
4474 | buf = alloca (size); | |
4475 | memset (buf, 0, size); | |
4476 | ||
4477 | if (the_low_target.collect_ptrace_register) | |
4478 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4479 | else | |
4480 | collect_register (regcache, regno, buf); | |
4481 | ||
0bfdf32f | 4482 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4483 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4484 | { | |
4485 | errno = 0; | |
4486 | ptrace (PTRACE_POKEUSER, pid, | |
4487 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4488 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4489 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4490 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4491 | if (errno != 0) |
4492 | { | |
4493 | /* At this point, ESRCH should mean the process is | |
4494 | already gone, in which case we simply ignore attempts | |
4495 | to change its registers. See also the related | |
4496 | comment in linux_resume_one_lwp. */ | |
4497 | if (errno == ESRCH) | |
4498 | return; | |
4499 | ||
4500 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4501 | error ("writing register %d: %s", regno, strerror (errno)); | |
4502 | } | |
4503 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4504 | } | |
4505 | } | |
4506 | ||
4507 | /* Fetch all registers, or just one, from the child process. | |
4508 | If REGNO is -1, do this for all registers, skipping any that are | |
4509 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4510 | unless ALL is non-zero. | |
4511 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4512 | static void | |
3aee8918 PA |
4513 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4514 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4515 | { |
3aee8918 PA |
4516 | struct usrregs_info *usr = regs_info->usrregs; |
4517 | ||
1faeff08 MR |
4518 | if (regno == -1) |
4519 | { | |
3aee8918 PA |
4520 | for (regno = 0; regno < usr->num_regs; regno++) |
4521 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4522 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4523 | } |
4524 | else | |
3aee8918 | 4525 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4526 | } |
4527 | ||
4528 | /* Store our register values back into the inferior. | |
4529 | If REGNO is -1, do this for all registers, skipping any that are | |
4530 | assumed to have been saved by regsets_store_inferior_registers, | |
4531 | unless ALL is non-zero. | |
4532 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4533 | static void | |
3aee8918 PA |
4534 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4535 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4536 | { |
3aee8918 PA |
4537 | struct usrregs_info *usr = regs_info->usrregs; |
4538 | ||
1faeff08 MR |
4539 | if (regno == -1) |
4540 | { | |
3aee8918 PA |
4541 | for (regno = 0; regno < usr->num_regs; regno++) |
4542 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4543 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4544 | } |
4545 | else | |
3aee8918 | 4546 | store_register (usr, regcache, regno); |
1faeff08 MR |
4547 | } |
4548 | ||
4549 | #else /* !HAVE_LINUX_USRREGS */ | |
4550 | ||
3aee8918 PA |
4551 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4552 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4553 | |
58caa3dc | 4554 | #endif |
1faeff08 MR |
4555 | |
4556 | ||
4557 | void | |
4558 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4559 | { | |
4560 | int use_regsets; | |
4561 | int all = 0; | |
3aee8918 | 4562 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4563 | |
4564 | if (regno == -1) | |
4565 | { | |
3aee8918 PA |
4566 | if (the_low_target.fetch_register != NULL |
4567 | && regs_info->usrregs != NULL) | |
4568 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4569 | (*the_low_target.fetch_register) (regcache, regno); |
4570 | ||
3aee8918 PA |
4571 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4572 | if (regs_info->usrregs != NULL) | |
4573 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4574 | } |
4575 | else | |
4576 | { | |
c14dfd32 PA |
4577 | if (the_low_target.fetch_register != NULL |
4578 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4579 | return; | |
4580 | ||
3aee8918 | 4581 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4582 | if (use_regsets) |
3aee8918 PA |
4583 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4584 | regcache); | |
4585 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4586 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4587 | } |
58caa3dc DJ |
4588 | } |
4589 | ||
4590 | void | |
442ea881 | 4591 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4592 | { |
1faeff08 MR |
4593 | int use_regsets; |
4594 | int all = 0; | |
3aee8918 | 4595 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4596 | |
4597 | if (regno == -1) | |
4598 | { | |
3aee8918 PA |
4599 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4600 | regcache); | |
4601 | if (regs_info->usrregs != NULL) | |
4602 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4603 | } |
4604 | else | |
4605 | { | |
3aee8918 | 4606 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4607 | if (use_regsets) |
3aee8918 PA |
4608 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4609 | regcache); | |
4610 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4611 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4612 | } |
58caa3dc DJ |
4613 | } |
4614 | ||
da6d8c04 | 4615 | |
da6d8c04 DJ |
4616 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4617 | to debugger memory starting at MYADDR. */ | |
4618 | ||
c3e735a6 | 4619 | static int |
f450004a | 4620 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4621 | { |
0bfdf32f | 4622 | int pid = lwpid_of (current_thread); |
4934b29e MR |
4623 | register PTRACE_XFER_TYPE *buffer; |
4624 | register CORE_ADDR addr; | |
4625 | register int count; | |
4626 | char filename[64]; | |
da6d8c04 | 4627 | register int i; |
4934b29e | 4628 | int ret; |
fd462a61 | 4629 | int fd; |
fd462a61 DJ |
4630 | |
4631 | /* Try using /proc. Don't bother for one word. */ | |
4632 | if (len >= 3 * sizeof (long)) | |
4633 | { | |
4934b29e MR |
4634 | int bytes; |
4635 | ||
fd462a61 DJ |
4636 | /* We could keep this file open and cache it - possibly one per |
4637 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4638 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4639 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4640 | if (fd == -1) | |
4641 | goto no_proc; | |
4642 | ||
4643 | /* If pread64 is available, use it. It's faster if the kernel | |
4644 | supports it (only one syscall), and it's 64-bit safe even on | |
4645 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4646 | application). */ | |
4647 | #ifdef HAVE_PREAD64 | |
4934b29e | 4648 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4649 | #else |
4934b29e MR |
4650 | bytes = -1; |
4651 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4652 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4653 | #endif |
fd462a61 DJ |
4654 | |
4655 | close (fd); | |
4934b29e MR |
4656 | if (bytes == len) |
4657 | return 0; | |
4658 | ||
4659 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4660 | if (bytes > 0) | |
4661 | { | |
4662 | memaddr += bytes; | |
4663 | myaddr += bytes; | |
4664 | len -= bytes; | |
4665 | } | |
fd462a61 | 4666 | } |
da6d8c04 | 4667 | |
fd462a61 | 4668 | no_proc: |
4934b29e MR |
4669 | /* Round starting address down to longword boundary. */ |
4670 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4671 | /* Round ending address up; get number of longwords that makes. */ | |
4672 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4673 | / sizeof (PTRACE_XFER_TYPE)); | |
4674 | /* Allocate buffer of that many longwords. */ | |
4675 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4676 | ||
da6d8c04 | 4677 | /* Read all the longwords */ |
4934b29e | 4678 | errno = 0; |
da6d8c04 DJ |
4679 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4680 | { | |
14ce3065 DE |
4681 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4682 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4683 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4684 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4685 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4686 | if (errno) |
4934b29e | 4687 | break; |
da6d8c04 | 4688 | } |
4934b29e | 4689 | ret = errno; |
da6d8c04 DJ |
4690 | |
4691 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4692 | if (i > 0) |
4693 | { | |
4694 | i *= sizeof (PTRACE_XFER_TYPE); | |
4695 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4696 | memcpy (myaddr, | |
4697 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4698 | i < len ? i : len); | |
4699 | } | |
c3e735a6 | 4700 | |
4934b29e | 4701 | return ret; |
da6d8c04 DJ |
4702 | } |
4703 | ||
93ae6fdc PA |
4704 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4705 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4706 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4707 | |
ce3a066d | 4708 | static int |
f450004a | 4709 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4710 | { |
4711 | register int i; | |
4712 | /* Round starting address down to longword boundary. */ | |
4713 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4714 | /* Round ending address up; get number of longwords that makes. */ | |
4715 | register int count | |
493e2a69 MS |
4716 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4717 | / sizeof (PTRACE_XFER_TYPE); | |
4718 | ||
da6d8c04 | 4719 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4720 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4721 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4722 | ||
0bfdf32f | 4723 | int pid = lwpid_of (current_thread); |
da6d8c04 | 4724 | |
f0ae6fc3 PA |
4725 | if (len == 0) |
4726 | { | |
4727 | /* Zero length write always succeeds. */ | |
4728 | return 0; | |
4729 | } | |
4730 | ||
0d62e5e8 DJ |
4731 | if (debug_threads) |
4732 | { | |
58d6951d DJ |
4733 | /* Dump up to four bytes. */ |
4734 | unsigned int val = * (unsigned int *) myaddr; | |
4735 | if (len == 1) | |
4736 | val = val & 0xff; | |
4737 | else if (len == 2) | |
4738 | val = val & 0xffff; | |
4739 | else if (len == 3) | |
4740 | val = val & 0xffffff; | |
87ce2a04 DE |
4741 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4742 | val, (long)memaddr); | |
0d62e5e8 DJ |
4743 | } |
4744 | ||
da6d8c04 DJ |
4745 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4746 | ||
93ae6fdc | 4747 | errno = 0; |
14ce3065 DE |
4748 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4749 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4750 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4751 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4752 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4753 | if (errno) |
4754 | return errno; | |
da6d8c04 DJ |
4755 | |
4756 | if (count > 1) | |
4757 | { | |
93ae6fdc | 4758 | errno = 0; |
da6d8c04 | 4759 | buffer[count - 1] |
95954743 | 4760 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4761 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4762 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4763 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4764 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4765 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4766 | if (errno) |
4767 | return errno; | |
da6d8c04 DJ |
4768 | } |
4769 | ||
93ae6fdc | 4770 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4771 | |
493e2a69 MS |
4772 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4773 | myaddr, len); | |
da6d8c04 DJ |
4774 | |
4775 | /* Write the entire buffer. */ | |
4776 | ||
4777 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4778 | { | |
4779 | errno = 0; | |
14ce3065 DE |
4780 | ptrace (PTRACE_POKETEXT, pid, |
4781 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4782 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4783 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4784 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4785 | if (errno) |
4786 | return errno; | |
4787 | } | |
4788 | ||
4789 | return 0; | |
4790 | } | |
2f2893d9 DJ |
4791 | |
4792 | static void | |
4793 | linux_look_up_symbols (void) | |
4794 | { | |
0d62e5e8 | 4795 | #ifdef USE_THREAD_DB |
95954743 PA |
4796 | struct process_info *proc = current_process (); |
4797 | ||
cdbfd419 | 4798 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4799 | return; |
4800 | ||
96d7229d LM |
4801 | /* If the kernel supports tracing clones, then we don't need to |
4802 | use the magic thread event breakpoint to learn about | |
4803 | threads. */ | |
4804 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4805 | #endif |
4806 | } | |
4807 | ||
e5379b03 | 4808 | static void |
ef57601b | 4809 | linux_request_interrupt (void) |
e5379b03 | 4810 | { |
a1928bad | 4811 | extern unsigned long signal_pid; |
e5379b03 | 4812 | |
78708b7c PA |
4813 | /* Send a SIGINT to the process group. This acts just like the user |
4814 | typed a ^C on the controlling terminal. */ | |
4815 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
4816 | } |
4817 | ||
aa691b87 RM |
4818 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4819 | to debugger memory starting at MYADDR. */ | |
4820 | ||
4821 | static int | |
f450004a | 4822 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4823 | { |
4824 | char filename[PATH_MAX]; | |
4825 | int fd, n; | |
0bfdf32f | 4826 | int pid = lwpid_of (current_thread); |
aa691b87 | 4827 | |
6cebaf6e | 4828 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4829 | |
4830 | fd = open (filename, O_RDONLY); | |
4831 | if (fd < 0) | |
4832 | return -1; | |
4833 | ||
4834 | if (offset != (CORE_ADDR) 0 | |
4835 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4836 | n = -1; | |
4837 | else | |
4838 | n = read (fd, myaddr, len); | |
4839 | ||
4840 | close (fd); | |
4841 | ||
4842 | return n; | |
4843 | } | |
4844 | ||
d993e290 PA |
4845 | /* These breakpoint and watchpoint related wrapper functions simply |
4846 | pass on the function call if the target has registered a | |
4847 | corresponding function. */ | |
e013ee27 OF |
4848 | |
4849 | static int | |
802e8e6d PA |
4850 | linux_supports_z_point_type (char z_type) |
4851 | { | |
4852 | return (the_low_target.supports_z_point_type != NULL | |
4853 | && the_low_target.supports_z_point_type (z_type)); | |
4854 | } | |
4855 | ||
4856 | static int | |
4857 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4858 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4859 | { |
d993e290 | 4860 | if (the_low_target.insert_point != NULL) |
802e8e6d | 4861 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
4862 | else |
4863 | /* Unsupported (see target.h). */ | |
4864 | return 1; | |
4865 | } | |
4866 | ||
4867 | static int | |
802e8e6d PA |
4868 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
4869 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4870 | { |
d993e290 | 4871 | if (the_low_target.remove_point != NULL) |
802e8e6d | 4872 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
4873 | else |
4874 | /* Unsupported (see target.h). */ | |
4875 | return 1; | |
4876 | } | |
4877 | ||
4878 | static int | |
4879 | linux_stopped_by_watchpoint (void) | |
4880 | { | |
0bfdf32f | 4881 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 4882 | |
582511be | 4883 | return lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
4884 | } |
4885 | ||
4886 | static CORE_ADDR | |
4887 | linux_stopped_data_address (void) | |
4888 | { | |
0bfdf32f | 4889 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
4890 | |
4891 | return lwp->stopped_data_address; | |
e013ee27 OF |
4892 | } |
4893 | ||
db0dfaa0 LM |
4894 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4895 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4896 | && defined(PT_TEXT_END_ADDR) | |
4897 | ||
4898 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4899 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4900 | the target has different ways of acquiring this information, like | |
4901 | loadmaps. */ | |
52fb6437 NS |
4902 | |
4903 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4904 | to tell gdb about. */ | |
4905 | ||
4906 | static int | |
4907 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4908 | { | |
52fb6437 | 4909 | unsigned long text, text_end, data; |
0bfdf32f | 4910 | int pid = lwpid_of (get_thread_lwp (current_thread)); |
52fb6437 NS |
4911 | |
4912 | errno = 0; | |
4913 | ||
b8e1b30e LM |
4914 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4915 | (PTRACE_TYPE_ARG4) 0); | |
4916 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4917 | (PTRACE_TYPE_ARG4) 0); | |
4918 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4919 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4920 | |
4921 | if (errno == 0) | |
4922 | { | |
4923 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4924 | used by gdb) are relative to the beginning of the program, |
4925 | with the data segment immediately following the text segment. | |
4926 | However, the actual runtime layout in memory may put the data | |
4927 | somewhere else, so when we send gdb a data base-address, we | |
4928 | use the real data base address and subtract the compile-time | |
4929 | data base-address from it (which is just the length of the | |
4930 | text segment). BSS immediately follows data in both | |
4931 | cases. */ | |
52fb6437 NS |
4932 | *text_p = text; |
4933 | *data_p = data - (text_end - text); | |
1b3f6016 | 4934 | |
52fb6437 NS |
4935 | return 1; |
4936 | } | |
52fb6437 NS |
4937 | return 0; |
4938 | } | |
4939 | #endif | |
4940 | ||
07e059b5 VP |
4941 | static int |
4942 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4943 | unsigned char *readbuf, unsigned const char *writebuf, |
4944 | CORE_ADDR offset, int len) | |
07e059b5 | 4945 | { |
d26e3629 | 4946 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4947 | } |
4948 | ||
d0722149 DE |
4949 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4950 | layout of the inferiors' architecture. */ | |
4951 | ||
4952 | static void | |
a5362b9a | 4953 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4954 | { |
4955 | int done = 0; | |
4956 | ||
4957 | if (the_low_target.siginfo_fixup != NULL) | |
4958 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4959 | ||
4960 | /* If there was no callback, or the callback didn't do anything, | |
4961 | then just do a straight memcpy. */ | |
4962 | if (!done) | |
4963 | { | |
4964 | if (direction == 1) | |
a5362b9a | 4965 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4966 | else |
a5362b9a | 4967 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4968 | } |
4969 | } | |
4970 | ||
4aa995e1 PA |
4971 | static int |
4972 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4973 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4974 | { | |
d0722149 | 4975 | int pid; |
a5362b9a TS |
4976 | siginfo_t siginfo; |
4977 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 4978 | |
0bfdf32f | 4979 | if (current_thread == NULL) |
4aa995e1 PA |
4980 | return -1; |
4981 | ||
0bfdf32f | 4982 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
4983 | |
4984 | if (debug_threads) | |
87ce2a04 DE |
4985 | debug_printf ("%s siginfo for lwp %d.\n", |
4986 | readbuf != NULL ? "Reading" : "Writing", | |
4987 | pid); | |
4aa995e1 | 4988 | |
0adea5f7 | 4989 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4990 | return -1; |
4991 | ||
b8e1b30e | 4992 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4993 | return -1; |
4994 | ||
d0722149 DE |
4995 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4996 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4997 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4998 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4999 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5000 | ||
4aa995e1 PA |
5001 | if (offset + len > sizeof (siginfo)) |
5002 | len = sizeof (siginfo) - offset; | |
5003 | ||
5004 | if (readbuf != NULL) | |
d0722149 | 5005 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5006 | else |
5007 | { | |
d0722149 DE |
5008 | memcpy (inf_siginfo + offset, writebuf, len); |
5009 | ||
5010 | /* Convert back to ptrace layout before flushing it out. */ | |
5011 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5012 | ||
b8e1b30e | 5013 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5014 | return -1; |
5015 | } | |
5016 | ||
5017 | return len; | |
5018 | } | |
5019 | ||
bd99dc85 PA |
5020 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5021 | so we notice when children change state; as the handler for the | |
5022 | sigsuspend in my_waitpid. */ | |
5023 | ||
5024 | static void | |
5025 | sigchld_handler (int signo) | |
5026 | { | |
5027 | int old_errno = errno; | |
5028 | ||
5029 | if (debug_threads) | |
e581f2b4 PA |
5030 | { |
5031 | do | |
5032 | { | |
5033 | /* fprintf is not async-signal-safe, so call write | |
5034 | directly. */ | |
5035 | if (write (2, "sigchld_handler\n", | |
5036 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5037 | break; /* just ignore */ | |
5038 | } while (0); | |
5039 | } | |
bd99dc85 PA |
5040 | |
5041 | if (target_is_async_p ()) | |
5042 | async_file_mark (); /* trigger a linux_wait */ | |
5043 | ||
5044 | errno = old_errno; | |
5045 | } | |
5046 | ||
5047 | static int | |
5048 | linux_supports_non_stop (void) | |
5049 | { | |
5050 | return 1; | |
5051 | } | |
5052 | ||
5053 | static int | |
5054 | linux_async (int enable) | |
5055 | { | |
7089dca4 | 5056 | int previous = target_is_async_p (); |
bd99dc85 | 5057 | |
8336d594 | 5058 | if (debug_threads) |
87ce2a04 DE |
5059 | debug_printf ("linux_async (%d), previous=%d\n", |
5060 | enable, previous); | |
8336d594 | 5061 | |
bd99dc85 PA |
5062 | if (previous != enable) |
5063 | { | |
5064 | sigset_t mask; | |
5065 | sigemptyset (&mask); | |
5066 | sigaddset (&mask, SIGCHLD); | |
5067 | ||
5068 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5069 | ||
5070 | if (enable) | |
5071 | { | |
5072 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5073 | { |
5074 | linux_event_pipe[0] = -1; | |
5075 | linux_event_pipe[1] = -1; | |
5076 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5077 | ||
5078 | warning ("creating event pipe failed."); | |
5079 | return previous; | |
5080 | } | |
bd99dc85 PA |
5081 | |
5082 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5083 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5084 | ||
5085 | /* Register the event loop handler. */ | |
5086 | add_file_handler (linux_event_pipe[0], | |
5087 | handle_target_event, NULL); | |
5088 | ||
5089 | /* Always trigger a linux_wait. */ | |
5090 | async_file_mark (); | |
5091 | } | |
5092 | else | |
5093 | { | |
5094 | delete_file_handler (linux_event_pipe[0]); | |
5095 | ||
5096 | close (linux_event_pipe[0]); | |
5097 | close (linux_event_pipe[1]); | |
5098 | linux_event_pipe[0] = -1; | |
5099 | linux_event_pipe[1] = -1; | |
5100 | } | |
5101 | ||
5102 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5103 | } | |
5104 | ||
5105 | return previous; | |
5106 | } | |
5107 | ||
5108 | static int | |
5109 | linux_start_non_stop (int nonstop) | |
5110 | { | |
5111 | /* Register or unregister from event-loop accordingly. */ | |
5112 | linux_async (nonstop); | |
aa96c426 GB |
5113 | |
5114 | if (target_is_async_p () != (nonstop != 0)) | |
5115 | return -1; | |
5116 | ||
bd99dc85 PA |
5117 | return 0; |
5118 | } | |
5119 | ||
cf8fd78b PA |
5120 | static int |
5121 | linux_supports_multi_process (void) | |
5122 | { | |
5123 | return 1; | |
5124 | } | |
5125 | ||
03583c20 UW |
5126 | static int |
5127 | linux_supports_disable_randomization (void) | |
5128 | { | |
5129 | #ifdef HAVE_PERSONALITY | |
5130 | return 1; | |
5131 | #else | |
5132 | return 0; | |
5133 | #endif | |
5134 | } | |
efcbbd14 | 5135 | |
d1feda86 YQ |
5136 | static int |
5137 | linux_supports_agent (void) | |
5138 | { | |
5139 | return 1; | |
5140 | } | |
5141 | ||
c2d6af84 PA |
5142 | static int |
5143 | linux_supports_range_stepping (void) | |
5144 | { | |
5145 | if (*the_low_target.supports_range_stepping == NULL) | |
5146 | return 0; | |
5147 | ||
5148 | return (*the_low_target.supports_range_stepping) (); | |
5149 | } | |
5150 | ||
efcbbd14 UW |
5151 | /* Enumerate spufs IDs for process PID. */ |
5152 | static int | |
5153 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5154 | { | |
5155 | int pos = 0; | |
5156 | int written = 0; | |
5157 | char path[128]; | |
5158 | DIR *dir; | |
5159 | struct dirent *entry; | |
5160 | ||
5161 | sprintf (path, "/proc/%ld/fd", pid); | |
5162 | dir = opendir (path); | |
5163 | if (!dir) | |
5164 | return -1; | |
5165 | ||
5166 | rewinddir (dir); | |
5167 | while ((entry = readdir (dir)) != NULL) | |
5168 | { | |
5169 | struct stat st; | |
5170 | struct statfs stfs; | |
5171 | int fd; | |
5172 | ||
5173 | fd = atoi (entry->d_name); | |
5174 | if (!fd) | |
5175 | continue; | |
5176 | ||
5177 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5178 | if (stat (path, &st) != 0) | |
5179 | continue; | |
5180 | if (!S_ISDIR (st.st_mode)) | |
5181 | continue; | |
5182 | ||
5183 | if (statfs (path, &stfs) != 0) | |
5184 | continue; | |
5185 | if (stfs.f_type != SPUFS_MAGIC) | |
5186 | continue; | |
5187 | ||
5188 | if (pos >= offset && pos + 4 <= offset + len) | |
5189 | { | |
5190 | *(unsigned int *)(buf + pos - offset) = fd; | |
5191 | written += 4; | |
5192 | } | |
5193 | pos += 4; | |
5194 | } | |
5195 | ||
5196 | closedir (dir); | |
5197 | return written; | |
5198 | } | |
5199 | ||
5200 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5201 | object type, using the /proc file system. */ | |
5202 | static int | |
5203 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5204 | unsigned const char *writebuf, | |
5205 | CORE_ADDR offset, int len) | |
5206 | { | |
0bfdf32f | 5207 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5208 | char buf[128]; |
5209 | int fd = 0; | |
5210 | int ret = 0; | |
5211 | ||
5212 | if (!writebuf && !readbuf) | |
5213 | return -1; | |
5214 | ||
5215 | if (!*annex) | |
5216 | { | |
5217 | if (!readbuf) | |
5218 | return -1; | |
5219 | else | |
5220 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5221 | } | |
5222 | ||
5223 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5224 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5225 | if (fd <= 0) | |
5226 | return -1; | |
5227 | ||
5228 | if (offset != 0 | |
5229 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5230 | { | |
5231 | close (fd); | |
5232 | return 0; | |
5233 | } | |
5234 | ||
5235 | if (writebuf) | |
5236 | ret = write (fd, writebuf, (size_t) len); | |
5237 | else | |
5238 | ret = read (fd, readbuf, (size_t) len); | |
5239 | ||
5240 | close (fd); | |
5241 | return ret; | |
5242 | } | |
5243 | ||
723b724b | 5244 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5245 | struct target_loadseg |
5246 | { | |
5247 | /* Core address to which the segment is mapped. */ | |
5248 | Elf32_Addr addr; | |
5249 | /* VMA recorded in the program header. */ | |
5250 | Elf32_Addr p_vaddr; | |
5251 | /* Size of this segment in memory. */ | |
5252 | Elf32_Word p_memsz; | |
5253 | }; | |
5254 | ||
723b724b | 5255 | # if defined PT_GETDSBT |
78d85199 YQ |
5256 | struct target_loadmap |
5257 | { | |
5258 | /* Protocol version number, must be zero. */ | |
5259 | Elf32_Word version; | |
5260 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5261 | unsigned *dsbt_table; | |
5262 | unsigned dsbt_size, dsbt_index; | |
5263 | /* Number of segments in this map. */ | |
5264 | Elf32_Word nsegs; | |
5265 | /* The actual memory map. */ | |
5266 | struct target_loadseg segs[/*nsegs*/]; | |
5267 | }; | |
723b724b MF |
5268 | # define LINUX_LOADMAP PT_GETDSBT |
5269 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5270 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5271 | # else | |
5272 | struct target_loadmap | |
5273 | { | |
5274 | /* Protocol version number, must be zero. */ | |
5275 | Elf32_Half version; | |
5276 | /* Number of segments in this map. */ | |
5277 | Elf32_Half nsegs; | |
5278 | /* The actual memory map. */ | |
5279 | struct target_loadseg segs[/*nsegs*/]; | |
5280 | }; | |
5281 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5282 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5283 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5284 | # endif | |
78d85199 | 5285 | |
78d85199 YQ |
5286 | static int |
5287 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5288 | unsigned char *myaddr, unsigned int len) | |
5289 | { | |
0bfdf32f | 5290 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5291 | int addr = -1; |
5292 | struct target_loadmap *data = NULL; | |
5293 | unsigned int actual_length, copy_length; | |
5294 | ||
5295 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5296 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5297 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5298 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5299 | else |
5300 | return -1; | |
5301 | ||
723b724b | 5302 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5303 | return -1; |
5304 | ||
5305 | if (data == NULL) | |
5306 | return -1; | |
5307 | ||
5308 | actual_length = sizeof (struct target_loadmap) | |
5309 | + sizeof (struct target_loadseg) * data->nsegs; | |
5310 | ||
5311 | if (offset < 0 || offset > actual_length) | |
5312 | return -1; | |
5313 | ||
5314 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5315 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5316 | return copy_length; | |
5317 | } | |
723b724b MF |
5318 | #else |
5319 | # define linux_read_loadmap NULL | |
5320 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5321 | |
1570b33e L |
5322 | static void |
5323 | linux_process_qsupported (const char *query) | |
5324 | { | |
5325 | if (the_low_target.process_qsupported != NULL) | |
5326 | the_low_target.process_qsupported (query); | |
5327 | } | |
5328 | ||
219f2f23 PA |
5329 | static int |
5330 | linux_supports_tracepoints (void) | |
5331 | { | |
5332 | if (*the_low_target.supports_tracepoints == NULL) | |
5333 | return 0; | |
5334 | ||
5335 | return (*the_low_target.supports_tracepoints) (); | |
5336 | } | |
5337 | ||
5338 | static CORE_ADDR | |
5339 | linux_read_pc (struct regcache *regcache) | |
5340 | { | |
5341 | if (the_low_target.get_pc == NULL) | |
5342 | return 0; | |
5343 | ||
5344 | return (*the_low_target.get_pc) (regcache); | |
5345 | } | |
5346 | ||
5347 | static void | |
5348 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5349 | { | |
5350 | gdb_assert (the_low_target.set_pc != NULL); | |
5351 | ||
5352 | (*the_low_target.set_pc) (regcache, pc); | |
5353 | } | |
5354 | ||
8336d594 PA |
5355 | static int |
5356 | linux_thread_stopped (struct thread_info *thread) | |
5357 | { | |
5358 | return get_thread_lwp (thread)->stopped; | |
5359 | } | |
5360 | ||
5361 | /* This exposes stop-all-threads functionality to other modules. */ | |
5362 | ||
5363 | static void | |
7984d532 | 5364 | linux_pause_all (int freeze) |
8336d594 | 5365 | { |
7984d532 PA |
5366 | stop_all_lwps (freeze, NULL); |
5367 | } | |
5368 | ||
5369 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5370 | modules. */ | |
5371 | ||
5372 | static void | |
5373 | linux_unpause_all (int unfreeze) | |
5374 | { | |
5375 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5376 | } |
5377 | ||
90d74c30 PA |
5378 | static int |
5379 | linux_prepare_to_access_memory (void) | |
5380 | { | |
5381 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5382 | running LWP. */ | |
5383 | if (non_stop) | |
5384 | linux_pause_all (1); | |
5385 | return 0; | |
5386 | } | |
5387 | ||
5388 | static void | |
0146f85b | 5389 | linux_done_accessing_memory (void) |
90d74c30 PA |
5390 | { |
5391 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5392 | running LWP. */ | |
5393 | if (non_stop) | |
5394 | linux_unpause_all (1); | |
5395 | } | |
5396 | ||
fa593d66 PA |
5397 | static int |
5398 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5399 | CORE_ADDR collector, | |
5400 | CORE_ADDR lockaddr, | |
5401 | ULONGEST orig_size, | |
5402 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5403 | CORE_ADDR *trampoline, |
5404 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5405 | unsigned char *jjump_pad_insn, |
5406 | ULONGEST *jjump_pad_insn_size, | |
5407 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5408 | CORE_ADDR *adjusted_insn_addr_end, |
5409 | char *err) | |
fa593d66 PA |
5410 | { |
5411 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5412 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5413 | jump_entry, trampoline, trampoline_size, |
5414 | jjump_pad_insn, jjump_pad_insn_size, | |
5415 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5416 | err); | |
fa593d66 PA |
5417 | } |
5418 | ||
6a271cae PA |
5419 | static struct emit_ops * |
5420 | linux_emit_ops (void) | |
5421 | { | |
5422 | if (the_low_target.emit_ops != NULL) | |
5423 | return (*the_low_target.emit_ops) (); | |
5424 | else | |
5425 | return NULL; | |
5426 | } | |
5427 | ||
405f8e94 SS |
5428 | static int |
5429 | linux_get_min_fast_tracepoint_insn_len (void) | |
5430 | { | |
5431 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5432 | } | |
5433 | ||
2268b414 JK |
5434 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5435 | ||
5436 | static int | |
5437 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5438 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5439 | { | |
5440 | char filename[PATH_MAX]; | |
5441 | int fd; | |
5442 | const int auxv_size = is_elf64 | |
5443 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5444 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5445 | ||
5446 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5447 | ||
5448 | fd = open (filename, O_RDONLY); | |
5449 | if (fd < 0) | |
5450 | return 1; | |
5451 | ||
5452 | *phdr_memaddr = 0; | |
5453 | *num_phdr = 0; | |
5454 | while (read (fd, buf, auxv_size) == auxv_size | |
5455 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5456 | { | |
5457 | if (is_elf64) | |
5458 | { | |
5459 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5460 | ||
5461 | switch (aux->a_type) | |
5462 | { | |
5463 | case AT_PHDR: | |
5464 | *phdr_memaddr = aux->a_un.a_val; | |
5465 | break; | |
5466 | case AT_PHNUM: | |
5467 | *num_phdr = aux->a_un.a_val; | |
5468 | break; | |
5469 | } | |
5470 | } | |
5471 | else | |
5472 | { | |
5473 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5474 | ||
5475 | switch (aux->a_type) | |
5476 | { | |
5477 | case AT_PHDR: | |
5478 | *phdr_memaddr = aux->a_un.a_val; | |
5479 | break; | |
5480 | case AT_PHNUM: | |
5481 | *num_phdr = aux->a_un.a_val; | |
5482 | break; | |
5483 | } | |
5484 | } | |
5485 | } | |
5486 | ||
5487 | close (fd); | |
5488 | ||
5489 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5490 | { | |
5491 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5492 | "phdr_memaddr = %ld, phdr_num = %d", | |
5493 | (long) *phdr_memaddr, *num_phdr); | |
5494 | return 2; | |
5495 | } | |
5496 | ||
5497 | return 0; | |
5498 | } | |
5499 | ||
5500 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5501 | ||
5502 | static CORE_ADDR | |
5503 | get_dynamic (const int pid, const int is_elf64) | |
5504 | { | |
5505 | CORE_ADDR phdr_memaddr, relocation; | |
5506 | int num_phdr, i; | |
5507 | unsigned char *phdr_buf; | |
5508 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5509 | ||
5510 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5511 | return 0; | |
5512 | ||
5513 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5514 | phdr_buf = alloca (num_phdr * phdr_size); | |
5515 | ||
5516 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5517 | return 0; | |
5518 | ||
5519 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5520 | non-zero for PIE ones. */ | |
5521 | relocation = -1; | |
5522 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5523 | if (is_elf64) | |
5524 | { | |
5525 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5526 | ||
5527 | if (p->p_type == PT_PHDR) | |
5528 | relocation = phdr_memaddr - p->p_vaddr; | |
5529 | } | |
5530 | else | |
5531 | { | |
5532 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5533 | ||
5534 | if (p->p_type == PT_PHDR) | |
5535 | relocation = phdr_memaddr - p->p_vaddr; | |
5536 | } | |
5537 | ||
5538 | if (relocation == -1) | |
5539 | { | |
e237a7e2 JK |
5540 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5541 | any real world executables, including PIE executables, have always | |
5542 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5543 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5544 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5545 | ||
5546 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5547 | ||
5548 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5549 | ||
2268b414 JK |
5550 | return 0; |
5551 | } | |
5552 | ||
5553 | for (i = 0; i < num_phdr; i++) | |
5554 | { | |
5555 | if (is_elf64) | |
5556 | { | |
5557 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5558 | ||
5559 | if (p->p_type == PT_DYNAMIC) | |
5560 | return p->p_vaddr + relocation; | |
5561 | } | |
5562 | else | |
5563 | { | |
5564 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5565 | ||
5566 | if (p->p_type == PT_DYNAMIC) | |
5567 | return p->p_vaddr + relocation; | |
5568 | } | |
5569 | } | |
5570 | ||
5571 | return 0; | |
5572 | } | |
5573 | ||
5574 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5575 | can be 0 if the inferior does not yet have the library list initialized. |
5576 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5577 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5578 | |
5579 | static CORE_ADDR | |
5580 | get_r_debug (const int pid, const int is_elf64) | |
5581 | { | |
5582 | CORE_ADDR dynamic_memaddr; | |
5583 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5584 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5585 | CORE_ADDR map = -1; |
2268b414 JK |
5586 | |
5587 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5588 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5589 | return map; |
2268b414 JK |
5590 | |
5591 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5592 | { | |
5593 | if (is_elf64) | |
5594 | { | |
5595 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5596 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5597 | union |
5598 | { | |
5599 | Elf64_Xword map; | |
5600 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5601 | } | |
5602 | rld_map; | |
5603 | ||
5604 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5605 | { | |
5606 | if (linux_read_memory (dyn->d_un.d_val, | |
5607 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5608 | return rld_map.map; | |
5609 | else | |
5610 | break; | |
5611 | } | |
75f62ce7 | 5612 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5613 | |
367ba2c2 MR |
5614 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5615 | map = dyn->d_un.d_val; | |
2268b414 JK |
5616 | |
5617 | if (dyn->d_tag == DT_NULL) | |
5618 | break; | |
5619 | } | |
5620 | else | |
5621 | { | |
5622 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5623 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5624 | union |
5625 | { | |
5626 | Elf32_Word map; | |
5627 | unsigned char buf[sizeof (Elf32_Word)]; | |
5628 | } | |
5629 | rld_map; | |
5630 | ||
5631 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5632 | { | |
5633 | if (linux_read_memory (dyn->d_un.d_val, | |
5634 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5635 | return rld_map.map; | |
5636 | else | |
5637 | break; | |
5638 | } | |
75f62ce7 | 5639 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5640 | |
367ba2c2 MR |
5641 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5642 | map = dyn->d_un.d_val; | |
2268b414 JK |
5643 | |
5644 | if (dyn->d_tag == DT_NULL) | |
5645 | break; | |
5646 | } | |
5647 | ||
5648 | dynamic_memaddr += dyn_size; | |
5649 | } | |
5650 | ||
367ba2c2 | 5651 | return map; |
2268b414 JK |
5652 | } |
5653 | ||
5654 | /* Read one pointer from MEMADDR in the inferior. */ | |
5655 | ||
5656 | static int | |
5657 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5658 | { | |
485f1ee4 PA |
5659 | int ret; |
5660 | ||
5661 | /* Go through a union so this works on either big or little endian | |
5662 | hosts, when the inferior's pointer size is smaller than the size | |
5663 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5664 | same of the superior's. */ | |
5665 | union | |
5666 | { | |
5667 | CORE_ADDR core_addr; | |
5668 | unsigned int ui; | |
5669 | unsigned char uc; | |
5670 | } addr; | |
5671 | ||
5672 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5673 | if (ret == 0) | |
5674 | { | |
5675 | if (ptr_size == sizeof (CORE_ADDR)) | |
5676 | *ptr = addr.core_addr; | |
5677 | else if (ptr_size == sizeof (unsigned int)) | |
5678 | *ptr = addr.ui; | |
5679 | else | |
5680 | gdb_assert_not_reached ("unhandled pointer size"); | |
5681 | } | |
5682 | return ret; | |
2268b414 JK |
5683 | } |
5684 | ||
5685 | struct link_map_offsets | |
5686 | { | |
5687 | /* Offset and size of r_debug.r_version. */ | |
5688 | int r_version_offset; | |
5689 | ||
5690 | /* Offset and size of r_debug.r_map. */ | |
5691 | int r_map_offset; | |
5692 | ||
5693 | /* Offset to l_addr field in struct link_map. */ | |
5694 | int l_addr_offset; | |
5695 | ||
5696 | /* Offset to l_name field in struct link_map. */ | |
5697 | int l_name_offset; | |
5698 | ||
5699 | /* Offset to l_ld field in struct link_map. */ | |
5700 | int l_ld_offset; | |
5701 | ||
5702 | /* Offset to l_next field in struct link_map. */ | |
5703 | int l_next_offset; | |
5704 | ||
5705 | /* Offset to l_prev field in struct link_map. */ | |
5706 | int l_prev_offset; | |
5707 | }; | |
5708 | ||
fb723180 | 5709 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5710 | |
5711 | static int | |
5712 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5713 | unsigned const char *writebuf, | |
5714 | CORE_ADDR offset, int len) | |
5715 | { | |
5716 | char *document; | |
5717 | unsigned document_len; | |
5718 | struct process_info_private *const priv = current_process ()->private; | |
5719 | char filename[PATH_MAX]; | |
5720 | int pid, is_elf64; | |
5721 | ||
5722 | static const struct link_map_offsets lmo_32bit_offsets = | |
5723 | { | |
5724 | 0, /* r_version offset. */ | |
5725 | 4, /* r_debug.r_map offset. */ | |
5726 | 0, /* l_addr offset in link_map. */ | |
5727 | 4, /* l_name offset in link_map. */ | |
5728 | 8, /* l_ld offset in link_map. */ | |
5729 | 12, /* l_next offset in link_map. */ | |
5730 | 16 /* l_prev offset in link_map. */ | |
5731 | }; | |
5732 | ||
5733 | static const struct link_map_offsets lmo_64bit_offsets = | |
5734 | { | |
5735 | 0, /* r_version offset. */ | |
5736 | 8, /* r_debug.r_map offset. */ | |
5737 | 0, /* l_addr offset in link_map. */ | |
5738 | 8, /* l_name offset in link_map. */ | |
5739 | 16, /* l_ld offset in link_map. */ | |
5740 | 24, /* l_next offset in link_map. */ | |
5741 | 32 /* l_prev offset in link_map. */ | |
5742 | }; | |
5743 | const struct link_map_offsets *lmo; | |
214d508e | 5744 | unsigned int machine; |
b1fbec62 GB |
5745 | int ptr_size; |
5746 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5747 | int allocated = 1024; | |
5748 | char *p; | |
5749 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5750 | int header_done = 0; | |
2268b414 JK |
5751 | |
5752 | if (writebuf != NULL) | |
5753 | return -2; | |
5754 | if (readbuf == NULL) | |
5755 | return -1; | |
5756 | ||
0bfdf32f | 5757 | pid = lwpid_of (current_thread); |
2268b414 | 5758 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5759 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5760 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5761 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5762 | |
b1fbec62 GB |
5763 | while (annex[0] != '\0') |
5764 | { | |
5765 | const char *sep; | |
5766 | CORE_ADDR *addrp; | |
5767 | int len; | |
2268b414 | 5768 | |
b1fbec62 GB |
5769 | sep = strchr (annex, '='); |
5770 | if (sep == NULL) | |
5771 | break; | |
0c5bf5a9 | 5772 | |
b1fbec62 GB |
5773 | len = sep - annex; |
5774 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5775 | addrp = &lm_addr; | |
5776 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5777 | addrp = &lm_prev; | |
5778 | else | |
5779 | { | |
5780 | annex = strchr (sep, ';'); | |
5781 | if (annex == NULL) | |
5782 | break; | |
5783 | annex++; | |
5784 | continue; | |
5785 | } | |
5786 | ||
5787 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5788 | } |
b1fbec62 GB |
5789 | |
5790 | if (lm_addr == 0) | |
2268b414 | 5791 | { |
b1fbec62 GB |
5792 | int r_version = 0; |
5793 | ||
5794 | if (priv->r_debug == 0) | |
5795 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5796 | ||
5797 | /* We failed to find DT_DEBUG. Such situation will not change | |
5798 | for this inferior - do not retry it. Report it to GDB as | |
5799 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5800 | if (priv->r_debug == (CORE_ADDR) -1) | |
5801 | return -1; | |
5802 | ||
5803 | if (priv->r_debug != 0) | |
2268b414 | 5804 | { |
b1fbec62 GB |
5805 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5806 | (unsigned char *) &r_version, | |
5807 | sizeof (r_version)) != 0 | |
5808 | || r_version != 1) | |
5809 | { | |
5810 | warning ("unexpected r_debug version %d", r_version); | |
5811 | } | |
5812 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5813 | &lm_addr, ptr_size) != 0) | |
5814 | { | |
5815 | warning ("unable to read r_map from 0x%lx", | |
5816 | (long) priv->r_debug + lmo->r_map_offset); | |
5817 | } | |
2268b414 | 5818 | } |
b1fbec62 | 5819 | } |
2268b414 | 5820 | |
b1fbec62 GB |
5821 | document = xmalloc (allocated); |
5822 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5823 | p = document + strlen (document); | |
5824 | ||
5825 | while (lm_addr | |
5826 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5827 | &l_name, ptr_size) == 0 | |
5828 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5829 | &l_addr, ptr_size) == 0 | |
5830 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5831 | &l_ld, ptr_size) == 0 | |
5832 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5833 | &l_prev, ptr_size) == 0 | |
5834 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5835 | &l_next, ptr_size) == 0) | |
5836 | { | |
5837 | unsigned char libname[PATH_MAX]; | |
5838 | ||
5839 | if (lm_prev != l_prev) | |
2268b414 | 5840 | { |
b1fbec62 GB |
5841 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5842 | (long) lm_prev, (long) l_prev); | |
5843 | break; | |
2268b414 JK |
5844 | } |
5845 | ||
d878444c JK |
5846 | /* Ignore the first entry even if it has valid name as the first entry |
5847 | corresponds to the main executable. The first entry should not be | |
5848 | skipped if the dynamic loader was loaded late by a static executable | |
5849 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5850 | executable does not have PT_DYNAMIC present and this function already | |
5851 | exited above due to failed get_r_debug. */ | |
5852 | if (lm_prev == 0) | |
2268b414 | 5853 | { |
d878444c JK |
5854 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5855 | p = p + strlen (p); | |
5856 | } | |
5857 | else | |
5858 | { | |
5859 | /* Not checking for error because reading may stop before | |
5860 | we've got PATH_MAX worth of characters. */ | |
5861 | libname[0] = '\0'; | |
5862 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5863 | libname[sizeof (libname) - 1] = '\0'; | |
5864 | if (libname[0] != '\0') | |
2268b414 | 5865 | { |
d878444c JK |
5866 | /* 6x the size for xml_escape_text below. */ |
5867 | size_t len = 6 * strlen ((char *) libname); | |
5868 | char *name; | |
2268b414 | 5869 | |
d878444c JK |
5870 | if (!header_done) |
5871 | { | |
5872 | /* Terminate `<library-list-svr4'. */ | |
5873 | *p++ = '>'; | |
5874 | header_done = 1; | |
5875 | } | |
2268b414 | 5876 | |
d878444c JK |
5877 | while (allocated < p - document + len + 200) |
5878 | { | |
5879 | /* Expand to guarantee sufficient storage. */ | |
5880 | uintptr_t document_len = p - document; | |
2268b414 | 5881 | |
d878444c JK |
5882 | document = xrealloc (document, 2 * allocated); |
5883 | allocated *= 2; | |
5884 | p = document + document_len; | |
5885 | } | |
5886 | ||
5887 | name = xml_escape_text ((char *) libname); | |
5888 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5889 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5890 | name, (unsigned long) lm_addr, | |
5891 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5892 | free (name); | |
5893 | } | |
0afae3cf | 5894 | } |
b1fbec62 GB |
5895 | |
5896 | lm_prev = lm_addr; | |
5897 | lm_addr = l_next; | |
2268b414 JK |
5898 | } |
5899 | ||
b1fbec62 GB |
5900 | if (!header_done) |
5901 | { | |
5902 | /* Empty list; terminate `<library-list-svr4'. */ | |
5903 | strcpy (p, "/>"); | |
5904 | } | |
5905 | else | |
5906 | strcpy (p, "</library-list-svr4>"); | |
5907 | ||
2268b414 JK |
5908 | document_len = strlen (document); |
5909 | if (offset < document_len) | |
5910 | document_len -= offset; | |
5911 | else | |
5912 | document_len = 0; | |
5913 | if (len > document_len) | |
5914 | len = document_len; | |
5915 | ||
5916 | memcpy (readbuf, document + offset, len); | |
5917 | xfree (document); | |
5918 | ||
5919 | return len; | |
5920 | } | |
5921 | ||
9accd112 MM |
5922 | #ifdef HAVE_LINUX_BTRACE |
5923 | ||
969c39fb | 5924 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5925 | |
5926 | static struct btrace_target_info * | |
5927 | linux_low_enable_btrace (ptid_t ptid) | |
5928 | { | |
5929 | struct btrace_target_info *tinfo; | |
5930 | ||
5931 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5932 | |
9accd112 | 5933 | if (tinfo != NULL) |
3aee8918 PA |
5934 | { |
5935 | struct thread_info *thread = find_thread_ptid (ptid); | |
5936 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5937 | ||
5938 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5939 | } | |
9accd112 MM |
5940 | |
5941 | return tinfo; | |
5942 | } | |
5943 | ||
969c39fb | 5944 | /* See to_disable_btrace target method. */ |
9accd112 | 5945 | |
969c39fb MM |
5946 | static int |
5947 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5948 | { | |
5949 | enum btrace_error err; | |
5950 | ||
5951 | err = linux_disable_btrace (tinfo); | |
5952 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5953 | } | |
5954 | ||
5955 | /* See to_read_btrace target method. */ | |
5956 | ||
5957 | static int | |
9accd112 MM |
5958 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5959 | int type) | |
5960 | { | |
5961 | VEC (btrace_block_s) *btrace; | |
5962 | struct btrace_block *block; | |
969c39fb | 5963 | enum btrace_error err; |
9accd112 MM |
5964 | int i; |
5965 | ||
969c39fb MM |
5966 | btrace = NULL; |
5967 | err = linux_read_btrace (&btrace, tinfo, type); | |
5968 | if (err != BTRACE_ERR_NONE) | |
5969 | { | |
5970 | if (err == BTRACE_ERR_OVERFLOW) | |
5971 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5972 | else | |
5973 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5974 | ||
5975 | return -1; | |
5976 | } | |
9accd112 MM |
5977 | |
5978 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5979 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5980 | ||
5981 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5982 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5983 | paddress (block->begin), paddress (block->end)); | |
5984 | ||
969c39fb | 5985 | buffer_grow_str0 (buffer, "</btrace>\n"); |
9accd112 MM |
5986 | |
5987 | VEC_free (btrace_block_s, btrace); | |
969c39fb MM |
5988 | |
5989 | return 0; | |
9accd112 MM |
5990 | } |
5991 | #endif /* HAVE_LINUX_BTRACE */ | |
5992 | ||
ce3a066d DJ |
5993 | static struct target_ops linux_target_ops = { |
5994 | linux_create_inferior, | |
5995 | linux_attach, | |
5996 | linux_kill, | |
6ad8ae5c | 5997 | linux_detach, |
8336d594 | 5998 | linux_mourn, |
444d6139 | 5999 | linux_join, |
ce3a066d DJ |
6000 | linux_thread_alive, |
6001 | linux_resume, | |
6002 | linux_wait, | |
6003 | linux_fetch_registers, | |
6004 | linux_store_registers, | |
90d74c30 | 6005 | linux_prepare_to_access_memory, |
0146f85b | 6006 | linux_done_accessing_memory, |
ce3a066d DJ |
6007 | linux_read_memory, |
6008 | linux_write_memory, | |
2f2893d9 | 6009 | linux_look_up_symbols, |
ef57601b | 6010 | linux_request_interrupt, |
aa691b87 | 6011 | linux_read_auxv, |
802e8e6d | 6012 | linux_supports_z_point_type, |
d993e290 PA |
6013 | linux_insert_point, |
6014 | linux_remove_point, | |
e013ee27 OF |
6015 | linux_stopped_by_watchpoint, |
6016 | linux_stopped_data_address, | |
db0dfaa0 LM |
6017 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6018 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6019 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6020 | linux_read_offsets, |
dae5f5cf DJ |
6021 | #else |
6022 | NULL, | |
6023 | #endif | |
6024 | #ifdef USE_THREAD_DB | |
6025 | thread_db_get_tls_address, | |
6026 | #else | |
6027 | NULL, | |
52fb6437 | 6028 | #endif |
efcbbd14 | 6029 | linux_qxfer_spu, |
59a016f0 | 6030 | hostio_last_error_from_errno, |
07e059b5 | 6031 | linux_qxfer_osdata, |
4aa995e1 | 6032 | linux_xfer_siginfo, |
bd99dc85 PA |
6033 | linux_supports_non_stop, |
6034 | linux_async, | |
6035 | linux_start_non_stop, | |
cdbfd419 PP |
6036 | linux_supports_multi_process, |
6037 | #ifdef USE_THREAD_DB | |
dc146f7c | 6038 | thread_db_handle_monitor_command, |
cdbfd419 | 6039 | #else |
dc146f7c | 6040 | NULL, |
cdbfd419 | 6041 | #endif |
d26e3629 | 6042 | linux_common_core_of_thread, |
78d85199 | 6043 | linux_read_loadmap, |
219f2f23 PA |
6044 | linux_process_qsupported, |
6045 | linux_supports_tracepoints, | |
6046 | linux_read_pc, | |
8336d594 PA |
6047 | linux_write_pc, |
6048 | linux_thread_stopped, | |
7984d532 | 6049 | NULL, |
711e434b | 6050 | linux_pause_all, |
7984d532 | 6051 | linux_unpause_all, |
fa593d66 | 6052 | linux_stabilize_threads, |
6a271cae | 6053 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6054 | linux_emit_ops, |
6055 | linux_supports_disable_randomization, | |
405f8e94 | 6056 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6057 | linux_qxfer_libraries_svr4, |
d1feda86 | 6058 | linux_supports_agent, |
9accd112 MM |
6059 | #ifdef HAVE_LINUX_BTRACE |
6060 | linux_supports_btrace, | |
6061 | linux_low_enable_btrace, | |
969c39fb | 6062 | linux_low_disable_btrace, |
9accd112 MM |
6063 | linux_low_read_btrace, |
6064 | #else | |
6065 | NULL, | |
6066 | NULL, | |
6067 | NULL, | |
6068 | NULL, | |
9accd112 | 6069 | #endif |
c2d6af84 | 6070 | linux_supports_range_stepping, |
ce3a066d DJ |
6071 | }; |
6072 | ||
0d62e5e8 DJ |
6073 | static void |
6074 | linux_init_signals () | |
6075 | { | |
6076 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6077 | to find what the cancel signal actually is. */ | |
1a981360 | 6078 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6079 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6080 | #endif |
0d62e5e8 DJ |
6081 | } |
6082 | ||
3aee8918 PA |
6083 | #ifdef HAVE_LINUX_REGSETS |
6084 | void | |
6085 | initialize_regsets_info (struct regsets_info *info) | |
6086 | { | |
6087 | for (info->num_regsets = 0; | |
6088 | info->regsets[info->num_regsets].size >= 0; | |
6089 | info->num_regsets++) | |
6090 | ; | |
3aee8918 PA |
6091 | } |
6092 | #endif | |
6093 | ||
da6d8c04 DJ |
6094 | void |
6095 | initialize_low (void) | |
6096 | { | |
bd99dc85 PA |
6097 | struct sigaction sigchld_action; |
6098 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6099 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6100 | set_breakpoint_data (the_low_target.breakpoint, |
6101 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6102 | linux_init_signals (); |
aa7c7447 | 6103 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6104 | |
6105 | sigchld_action.sa_handler = sigchld_handler; | |
6106 | sigemptyset (&sigchld_action.sa_mask); | |
6107 | sigchld_action.sa_flags = SA_RESTART; | |
6108 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6109 | |
6110 | initialize_low_arch (); | |
da6d8c04 | 6111 | } |