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" |
734b0e4b | 106 | # include "btrace-common.h" |
9accd112 MM |
107 | #endif |
108 | ||
8365dcf5 TJB |
109 | #ifndef HAVE_ELF32_AUXV_T |
110 | /* Copied from glibc's elf.h. */ | |
111 | typedef struct | |
112 | { | |
113 | uint32_t a_type; /* Entry type */ | |
114 | union | |
115 | { | |
116 | uint32_t a_val; /* Integer value */ | |
117 | /* We use to have pointer elements added here. We cannot do that, | |
118 | though, since it does not work when using 32-bit definitions | |
119 | on 64-bit platforms and vice versa. */ | |
120 | } a_un; | |
121 | } Elf32_auxv_t; | |
122 | #endif | |
123 | ||
124 | #ifndef HAVE_ELF64_AUXV_T | |
125 | /* Copied from glibc's elf.h. */ | |
126 | typedef struct | |
127 | { | |
128 | uint64_t a_type; /* Entry type */ | |
129 | union | |
130 | { | |
131 | uint64_t a_val; /* Integer value */ | |
132 | /* We use to have pointer elements added here. We cannot do that, | |
133 | though, since it does not work when using 32-bit definitions | |
134 | on 64-bit platforms and vice versa. */ | |
135 | } a_un; | |
136 | } Elf64_auxv_t; | |
137 | #endif | |
138 | ||
05044653 PA |
139 | /* A list of all unknown processes which receive stop signals. Some |
140 | other process will presumably claim each of these as forked | |
141 | children momentarily. */ | |
24a09b5f | 142 | |
05044653 PA |
143 | struct simple_pid_list |
144 | { | |
145 | /* The process ID. */ | |
146 | int pid; | |
147 | ||
148 | /* The status as reported by waitpid. */ | |
149 | int status; | |
150 | ||
151 | /* Next in chain. */ | |
152 | struct simple_pid_list *next; | |
153 | }; | |
154 | struct simple_pid_list *stopped_pids; | |
155 | ||
156 | /* Trivial list manipulation functions to keep track of a list of new | |
157 | stopped processes. */ | |
158 | ||
159 | static void | |
160 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
161 | { | |
162 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
163 | ||
164 | new_pid->pid = pid; | |
165 | new_pid->status = status; | |
166 | new_pid->next = *listp; | |
167 | *listp = new_pid; | |
168 | } | |
169 | ||
170 | static int | |
171 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
172 | { | |
173 | struct simple_pid_list **p; | |
174 | ||
175 | for (p = listp; *p != NULL; p = &(*p)->next) | |
176 | if ((*p)->pid == pid) | |
177 | { | |
178 | struct simple_pid_list *next = (*p)->next; | |
179 | ||
180 | *statusp = (*p)->status; | |
181 | xfree (*p); | |
182 | *p = next; | |
183 | return 1; | |
184 | } | |
185 | return 0; | |
186 | } | |
24a09b5f | 187 | |
bde24c0a PA |
188 | enum stopping_threads_kind |
189 | { | |
190 | /* Not stopping threads presently. */ | |
191 | NOT_STOPPING_THREADS, | |
192 | ||
193 | /* Stopping threads. */ | |
194 | STOPPING_THREADS, | |
195 | ||
196 | /* Stopping and suspending threads. */ | |
197 | STOPPING_AND_SUSPENDING_THREADS | |
198 | }; | |
199 | ||
200 | /* This is set while stop_all_lwps is in effect. */ | |
201 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
202 | |
203 | /* FIXME make into a target method? */ | |
24a09b5f | 204 | int using_threads = 1; |
24a09b5f | 205 | |
fa593d66 PA |
206 | /* True if we're presently stabilizing threads (moving them out of |
207 | jump pads). */ | |
208 | static int stabilizing_threads; | |
209 | ||
2acc282a | 210 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 211 | int step, int signal, siginfo_t *info); |
2bd7c093 | 212 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
213 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
214 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
215 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
216 | int *wstat, int options); | |
95954743 | 217 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 218 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 219 | static int linux_stopped_by_watchpoint (void); |
95954743 | 220 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 221 | static void proceed_all_lwps (void); |
d50171e4 | 222 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
223 | static int kill_lwp (unsigned long lwpid, int signo); |
224 | ||
582511be PA |
225 | /* When the event-loop is doing a step-over, this points at the thread |
226 | being stepped. */ | |
227 | ptid_t step_over_bkpt; | |
228 | ||
d50171e4 PA |
229 | /* True if the low target can hardware single-step. Such targets |
230 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
231 | ||
232 | static int | |
233 | can_hardware_single_step (void) | |
234 | { | |
235 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
236 | } | |
237 | ||
238 | /* True if the low target supports memory breakpoints. If so, we'll | |
239 | have a GET_PC implementation. */ | |
240 | ||
241 | static int | |
242 | supports_breakpoints (void) | |
243 | { | |
244 | return (the_low_target.get_pc != NULL); | |
245 | } | |
0d62e5e8 | 246 | |
fa593d66 PA |
247 | /* Returns true if this target can support fast tracepoints. This |
248 | does not mean that the in-process agent has been loaded in the | |
249 | inferior. */ | |
250 | ||
251 | static int | |
252 | supports_fast_tracepoints (void) | |
253 | { | |
254 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
255 | } | |
256 | ||
c2d6af84 PA |
257 | /* True if LWP is stopped in its stepping range. */ |
258 | ||
259 | static int | |
260 | lwp_in_step_range (struct lwp_info *lwp) | |
261 | { | |
262 | CORE_ADDR pc = lwp->stop_pc; | |
263 | ||
264 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
265 | } | |
266 | ||
0d62e5e8 DJ |
267 | struct pending_signals |
268 | { | |
269 | int signal; | |
32ca6d61 | 270 | siginfo_t info; |
0d62e5e8 DJ |
271 | struct pending_signals *prev; |
272 | }; | |
611cb4a5 | 273 | |
bd99dc85 PA |
274 | /* The read/write ends of the pipe registered as waitable file in the |
275 | event loop. */ | |
276 | static int linux_event_pipe[2] = { -1, -1 }; | |
277 | ||
278 | /* True if we're currently in async mode. */ | |
279 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
280 | ||
02fc4de7 | 281 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 282 | static void wait_for_sigstop (void); |
bd99dc85 | 283 | |
d0722149 DE |
284 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
285 | ||
286 | static int | |
214d508e | 287 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 288 | { |
214d508e L |
289 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
290 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
291 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
292 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
293 | { | |
294 | *machine = header->e_machine; | |
295 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
296 | ||
297 | } | |
298 | *machine = EM_NONE; | |
299 | return -1; | |
d0722149 DE |
300 | } |
301 | ||
302 | /* Return non-zero if FILE is a 64-bit ELF file, | |
303 | zero if the file is not a 64-bit ELF file, | |
304 | and -1 if the file is not accessible or doesn't exist. */ | |
305 | ||
be07f1a2 | 306 | static int |
214d508e | 307 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 308 | { |
957f3f49 | 309 | Elf64_Ehdr header; |
d0722149 DE |
310 | int fd; |
311 | ||
312 | fd = open (file, O_RDONLY); | |
313 | if (fd < 0) | |
314 | return -1; | |
315 | ||
316 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
317 | { | |
318 | close (fd); | |
319 | return 0; | |
320 | } | |
321 | close (fd); | |
322 | ||
214d508e | 323 | return elf_64_header_p (&header, machine); |
d0722149 DE |
324 | } |
325 | ||
be07f1a2 PA |
326 | /* Accepts an integer PID; Returns true if the executable PID is |
327 | running is a 64-bit ELF file.. */ | |
328 | ||
329 | int | |
214d508e | 330 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 331 | { |
d8d2a3ee | 332 | char file[PATH_MAX]; |
be07f1a2 PA |
333 | |
334 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 335 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
336 | } |
337 | ||
bd99dc85 PA |
338 | static void |
339 | delete_lwp (struct lwp_info *lwp) | |
340 | { | |
fa96cb38 PA |
341 | struct thread_info *thr = get_lwp_thread (lwp); |
342 | ||
343 | if (debug_threads) | |
344 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
345 | ||
346 | remove_thread (thr); | |
aa5ca48f | 347 | free (lwp->arch_private); |
bd99dc85 PA |
348 | free (lwp); |
349 | } | |
350 | ||
95954743 PA |
351 | /* Add a process to the common process list, and set its private |
352 | data. */ | |
353 | ||
354 | static struct process_info * | |
355 | linux_add_process (int pid, int attached) | |
356 | { | |
357 | struct process_info *proc; | |
358 | ||
95954743 PA |
359 | proc = add_process (pid, attached); |
360 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
361 | ||
3aee8918 PA |
362 | /* Set the arch when the first LWP stops. */ |
363 | proc->private->new_inferior = 1; | |
364 | ||
aa5ca48f DE |
365 | if (the_low_target.new_process != NULL) |
366 | proc->private->arch_private = the_low_target.new_process (); | |
367 | ||
95954743 PA |
368 | return proc; |
369 | } | |
370 | ||
582511be PA |
371 | static CORE_ADDR get_pc (struct lwp_info *lwp); |
372 | ||
bd99dc85 PA |
373 | /* Handle a GNU/Linux extended wait response. If we see a clone |
374 | event, we need to add the new LWP to our list (and not report the | |
375 | trap to higher layers). */ | |
0d62e5e8 | 376 | |
24a09b5f | 377 | static void |
54a0b537 | 378 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f | 379 | { |
89a5711c | 380 | int event = linux_ptrace_get_extended_event (wstat); |
d86d4aaf | 381 | struct thread_info *event_thr = get_lwp_thread (event_child); |
54a0b537 | 382 | struct lwp_info *new_lwp; |
24a09b5f DJ |
383 | |
384 | if (event == PTRACE_EVENT_CLONE) | |
385 | { | |
95954743 | 386 | ptid_t ptid; |
24a09b5f | 387 | unsigned long new_pid; |
05044653 | 388 | int ret, status; |
24a09b5f | 389 | |
d86d4aaf | 390 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_thr), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 391 | &new_pid); |
24a09b5f DJ |
392 | |
393 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 394 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
395 | { |
396 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
397 | hits the SIGSTOP, but we're already attached. */ | |
398 | ||
97438e3f | 399 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
400 | |
401 | if (ret == -1) | |
402 | perror_with_name ("waiting for new child"); | |
403 | else if (ret != new_pid) | |
404 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 405 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
406 | warning ("wait returned unexpected status 0x%x", status); |
407 | } | |
408 | ||
fa96cb38 PA |
409 | if (debug_threads) |
410 | debug_printf ("HEW: Got clone event " | |
411 | "from LWP %ld, new child is LWP %ld\n", | |
412 | lwpid_of (event_thr), new_pid); | |
413 | ||
d86d4aaf | 414 | ptid = ptid_build (pid_of (event_thr), new_pid, 0); |
b3312d80 | 415 | new_lwp = add_lwp (ptid); |
24a09b5f | 416 | |
e27d73f6 DE |
417 | /* Either we're going to immediately resume the new thread |
418 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
419 | thinks the thread is currently running, so set this first | |
420 | before calling linux_resume_one_lwp. */ | |
421 | new_lwp->stopped = 1; | |
422 | ||
bde24c0a PA |
423 | /* If we're suspending all threads, leave this one suspended |
424 | too. */ | |
425 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
426 | new_lwp->suspended = 1; | |
427 | ||
da5898ce DJ |
428 | /* Normally we will get the pending SIGSTOP. But in some cases |
429 | we might get another signal delivered to the group first. | |
f21cc1a2 | 430 | If we do get another signal, be sure not to lose it. */ |
20ba1ce6 | 431 | if (WSTOPSIG (status) != SIGSTOP) |
da5898ce | 432 | { |
54a0b537 | 433 | new_lwp->stop_expected = 1; |
20ba1ce6 PA |
434 | new_lwp->status_pending_p = 1; |
435 | new_lwp->status_pending = status; | |
da5898ce | 436 | } |
24a09b5f DJ |
437 | } |
438 | } | |
439 | ||
d50171e4 PA |
440 | /* Return the PC as read from the regcache of LWP, without any |
441 | adjustment. */ | |
442 | ||
443 | static CORE_ADDR | |
444 | get_pc (struct lwp_info *lwp) | |
445 | { | |
0bfdf32f | 446 | struct thread_info *saved_thread; |
d50171e4 PA |
447 | struct regcache *regcache; |
448 | CORE_ADDR pc; | |
449 | ||
450 | if (the_low_target.get_pc == NULL) | |
451 | return 0; | |
452 | ||
0bfdf32f GB |
453 | saved_thread = current_thread; |
454 | current_thread = get_lwp_thread (lwp); | |
d50171e4 | 455 | |
0bfdf32f | 456 | regcache = get_thread_regcache (current_thread, 1); |
d50171e4 PA |
457 | pc = (*the_low_target.get_pc) (regcache); |
458 | ||
459 | if (debug_threads) | |
87ce2a04 | 460 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 | 461 | |
0bfdf32f | 462 | current_thread = saved_thread; |
d50171e4 PA |
463 | return pc; |
464 | } | |
465 | ||
466 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
467 | The SIGTRAP could mean several things. |
468 | ||
469 | On i386, where decr_pc_after_break is non-zero: | |
582511be PA |
470 | |
471 | If we were single-stepping this process using PTRACE_SINGLESTEP, we | |
472 | will get only the one SIGTRAP. The value of $eip will be the next | |
473 | instruction. If the instruction we stepped over was a breakpoint, | |
474 | we need to decrement the PC. | |
475 | ||
0d62e5e8 DJ |
476 | If we continue the process using PTRACE_CONT, we will get a |
477 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
478 | the instruction after the breakpoint (i.e. needs to be | |
479 | decremented). If we report the SIGTRAP to GDB, we must also | |
582511be | 480 | report the undecremented PC. If the breakpoint is removed, we |
0d62e5e8 DJ |
481 | must resume at the decremented PC. |
482 | ||
582511be PA |
483 | On a non-decr_pc_after_break machine with hardware or kernel |
484 | single-step: | |
485 | ||
486 | If we either single-step a breakpoint instruction, or continue and | |
487 | hit a breakpoint instruction, our PC will point at the breakpoint | |
0d62e5e8 DJ |
488 | instruction. */ |
489 | ||
582511be PA |
490 | static int |
491 | check_stopped_by_breakpoint (struct lwp_info *lwp) | |
0d62e5e8 | 492 | { |
582511be PA |
493 | CORE_ADDR pc; |
494 | CORE_ADDR sw_breakpoint_pc; | |
495 | struct thread_info *saved_thread; | |
d50171e4 PA |
496 | |
497 | if (the_low_target.get_pc == NULL) | |
498 | return 0; | |
0d62e5e8 | 499 | |
582511be PA |
500 | pc = get_pc (lwp); |
501 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 502 | |
582511be PA |
503 | /* breakpoint_at reads from the current thread. */ |
504 | saved_thread = current_thread; | |
505 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 506 | |
582511be PA |
507 | /* We may have just stepped a breakpoint instruction. E.g., in |
508 | non-stop mode, GDB first tells the thread A to step a range, and | |
509 | then the user inserts a breakpoint inside the range. In that | |
510 | case, we need to report the breakpoint PC. But, when we're | |
511 | trying to step past one of our own breakpoints, that happens to | |
512 | have been placed on top of a permanent breakpoint instruction, we | |
513 | shouldn't adjust the PC, otherwise the program would keep | |
514 | trapping the permanent breakpoint forever. */ | |
515 | if ((!lwp->stepping | |
516 | || (!ptid_equal (ptid_of (current_thread), step_over_bkpt) | |
517 | && lwp->stop_pc == sw_breakpoint_pc)) | |
518 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) | |
519 | { | |
520 | if (debug_threads) | |
521 | { | |
522 | struct thread_info *thr = get_lwp_thread (lwp); | |
523 | ||
524 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
525 | target_pid_to_str (ptid_of (thr))); | |
526 | } | |
527 | ||
528 | /* Back up the PC if necessary. */ | |
529 | if (pc != sw_breakpoint_pc) | |
530 | { | |
531 | struct regcache *regcache | |
532 | = get_thread_regcache (current_thread, 1); | |
533 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
534 | } | |
535 | ||
536 | lwp->stop_pc = sw_breakpoint_pc; | |
537 | lwp->stop_reason = LWP_STOPPED_BY_SW_BREAKPOINT; | |
538 | current_thread = saved_thread; | |
539 | return 1; | |
540 | } | |
541 | ||
542 | if (hardware_breakpoint_inserted_here (pc)) | |
543 | { | |
544 | if (debug_threads) | |
545 | { | |
546 | struct thread_info *thr = get_lwp_thread (lwp); | |
547 | ||
548 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
549 | target_pid_to_str (ptid_of (thr))); | |
550 | } | |
47c0c975 | 551 | |
582511be PA |
552 | lwp->stop_pc = pc; |
553 | lwp->stop_reason = LWP_STOPPED_BY_HW_BREAKPOINT; | |
554 | current_thread = saved_thread; | |
555 | return 1; | |
556 | } | |
557 | ||
558 | current_thread = saved_thread; | |
559 | return 0; | |
0d62e5e8 | 560 | } |
ce3a066d | 561 | |
b3312d80 | 562 | static struct lwp_info * |
95954743 | 563 | add_lwp (ptid_t ptid) |
611cb4a5 | 564 | { |
54a0b537 | 565 | struct lwp_info *lwp; |
0d62e5e8 | 566 | |
54a0b537 PA |
567 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
568 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 569 | |
aa5ca48f DE |
570 | if (the_low_target.new_thread != NULL) |
571 | lwp->arch_private = the_low_target.new_thread (); | |
572 | ||
f7667f0d | 573 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 574 | |
54a0b537 | 575 | return lwp; |
0d62e5e8 | 576 | } |
611cb4a5 | 577 | |
da6d8c04 DJ |
578 | /* Start an inferior process and returns its pid. |
579 | ALLARGS is a vector of program-name and args. */ | |
580 | ||
ce3a066d DJ |
581 | static int |
582 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 583 | { |
a6dbe5df | 584 | struct lwp_info *new_lwp; |
da6d8c04 | 585 | int pid; |
95954743 | 586 | ptid_t ptid; |
8cc73a39 SDJ |
587 | struct cleanup *restore_personality |
588 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 589 | |
42c81e2a | 590 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
591 | pid = vfork (); |
592 | #else | |
da6d8c04 | 593 | pid = fork (); |
52fb6437 | 594 | #endif |
da6d8c04 DJ |
595 | if (pid < 0) |
596 | perror_with_name ("fork"); | |
597 | ||
598 | if (pid == 0) | |
599 | { | |
602e3198 | 600 | close_most_fds (); |
b8e1b30e | 601 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 602 | |
1a981360 | 603 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 604 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 605 | #endif |
0d62e5e8 | 606 | |
a9fa9f7d DJ |
607 | setpgid (0, 0); |
608 | ||
e0f9f062 DE |
609 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
610 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
611 | Also, redirect stdin to /dev/null. */ | |
612 | if (remote_connection_is_stdio ()) | |
613 | { | |
614 | close (0); | |
615 | open ("/dev/null", O_RDONLY); | |
616 | dup2 (2, 1); | |
3e52c33d JK |
617 | if (write (2, "stdin/stdout redirected\n", |
618 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
619 | { |
620 | /* Errors ignored. */; | |
621 | } | |
e0f9f062 DE |
622 | } |
623 | ||
2b876972 DJ |
624 | execv (program, allargs); |
625 | if (errno == ENOENT) | |
626 | execvp (program, allargs); | |
da6d8c04 DJ |
627 | |
628 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 629 | strerror (errno)); |
da6d8c04 DJ |
630 | fflush (stderr); |
631 | _exit (0177); | |
632 | } | |
633 | ||
8cc73a39 | 634 | do_cleanups (restore_personality); |
03583c20 | 635 | |
95954743 PA |
636 | linux_add_process (pid, 0); |
637 | ||
638 | ptid = ptid_build (pid, pid, 0); | |
639 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 640 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 641 | |
a9fa9f7d | 642 | return pid; |
da6d8c04 DJ |
643 | } |
644 | ||
8784d563 PA |
645 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
646 | error. */ | |
da6d8c04 | 647 | |
7ae1a6a6 PA |
648 | int |
649 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 650 | { |
54a0b537 | 651 | struct lwp_info *new_lwp; |
7ae1a6a6 | 652 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 653 | |
b8e1b30e | 654 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 655 | != 0) |
7ae1a6a6 | 656 | return errno; |
24a09b5f | 657 | |
b3312d80 | 658 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 659 | |
a6dbe5df PA |
660 | /* We need to wait for SIGSTOP before being able to make the next |
661 | ptrace call on this LWP. */ | |
662 | new_lwp->must_set_ptrace_flags = 1; | |
663 | ||
644cebc9 | 664 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
665 | { |
666 | if (debug_threads) | |
87ce2a04 | 667 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
668 | |
669 | /* The process is definitely stopped. It is in a job control | |
670 | stop, unless the kernel predates the TASK_STOPPED / | |
671 | TASK_TRACED distinction, in which case it might be in a | |
672 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
673 | can kill it, signal it, et cetera. | |
674 | ||
675 | First make sure there is a pending SIGSTOP. Since we are | |
676 | already attached, the process can not transition from stopped | |
677 | to running without a PTRACE_CONT; so we know this signal will | |
678 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
679 | probably already in the queue (unless this kernel is old | |
680 | enough to use TASK_STOPPED for ptrace stops); but since | |
681 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
682 | kill_lwp (lwpid, SIGSTOP); | |
683 | ||
684 | /* Finally, resume the stopped process. This will deliver the | |
685 | SIGSTOP (or a higher priority signal, just like normal | |
686 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 687 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
688 | } |
689 | ||
0d62e5e8 | 690 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
691 | brings it to a halt. |
692 | ||
693 | There are several cases to consider here: | |
694 | ||
695 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 696 | of a new thread that is being created. |
d50171e4 PA |
697 | In this case we should ignore that SIGSTOP and resume the |
698 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 699 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 700 | resume_continue. |
0e21c1ec DE |
701 | |
702 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
703 | to it via attach_inferior. |
704 | In this case we want the process thread to stop. | |
d50171e4 PA |
705 | This is handled by having linux_attach set last_resume_kind == |
706 | resume_stop after we return. | |
e3deef73 LM |
707 | |
708 | If the pid we are attaching to is also the tgid, we attach to and | |
709 | stop all the existing threads. Otherwise, we attach to pid and | |
710 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
711 | |
712 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
713 | existing threads. |
714 | In this case we want the thread to stop. | |
715 | FIXME: This case is currently not properly handled. | |
716 | We should wait for the SIGSTOP but don't. Things work apparently | |
717 | because enough time passes between when we ptrace (ATTACH) and when | |
718 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
719 | |
720 | On the other hand, if we are currently trying to stop all threads, we | |
721 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 722 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
723 | end of the list, and so the new thread has not yet reached |
724 | wait_for_sigstop (but will). */ | |
d50171e4 | 725 | new_lwp->stop_expected = 1; |
0d62e5e8 | 726 | |
7ae1a6a6 | 727 | return 0; |
95954743 PA |
728 | } |
729 | ||
8784d563 PA |
730 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
731 | already attached. Returns true if a new LWP is found, false | |
732 | otherwise. */ | |
733 | ||
734 | static int | |
735 | attach_proc_task_lwp_callback (ptid_t ptid) | |
736 | { | |
737 | /* Is this a new thread? */ | |
738 | if (find_thread_ptid (ptid) == NULL) | |
739 | { | |
740 | int lwpid = ptid_get_lwp (ptid); | |
741 | int err; | |
742 | ||
743 | if (debug_threads) | |
744 | debug_printf ("Found new lwp %d\n", lwpid); | |
745 | ||
746 | err = linux_attach_lwp (ptid); | |
747 | ||
748 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
749 | is returned if the thread's task still exists, and is marked | |
750 | as exited or zombie, as well as other conditions, so in that | |
751 | case, confirm the status in /proc/PID/status. */ | |
752 | if (err == ESRCH | |
753 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
754 | { | |
755 | if (debug_threads) | |
756 | { | |
757 | debug_printf ("Cannot attach to lwp %d: " | |
758 | "thread is gone (%d: %s)\n", | |
759 | lwpid, err, strerror (err)); | |
760 | } | |
761 | } | |
762 | else if (err != 0) | |
763 | { | |
764 | warning (_("Cannot attach to lwp %d: %s"), | |
765 | lwpid, | |
766 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
767 | } | |
768 | ||
769 | return 1; | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
e3deef73 LM |
774 | /* Attach to PID. If PID is the tgid, attach to it and all |
775 | of its threads. */ | |
776 | ||
c52daf70 | 777 | static int |
a1928bad | 778 | linux_attach (unsigned long pid) |
0d62e5e8 | 779 | { |
7ae1a6a6 PA |
780 | ptid_t ptid = ptid_build (pid, pid, 0); |
781 | int err; | |
782 | ||
e3deef73 LM |
783 | /* Attach to PID. We will check for other threads |
784 | soon. */ | |
7ae1a6a6 PA |
785 | err = linux_attach_lwp (ptid); |
786 | if (err != 0) | |
787 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 788 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 789 | |
95954743 | 790 | linux_add_process (pid, 1); |
0d62e5e8 | 791 | |
bd99dc85 PA |
792 | if (!non_stop) |
793 | { | |
8336d594 PA |
794 | struct thread_info *thread; |
795 | ||
796 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
797 | process. It will be collected by wait shortly. */ | |
798 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
799 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 800 | } |
0d62e5e8 | 801 | |
8784d563 PA |
802 | /* We must attach to every LWP. If /proc is mounted, use that to |
803 | find them now. On the one hand, the inferior may be using raw | |
804 | clone instead of using pthreads. On the other hand, even if it | |
805 | is using pthreads, GDB may not be connected yet (thread_db needs | |
806 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
807 | structures in the inferior's address space to find the list of | |
808 | threads/LWPs, and those structures may well be corrupted. Note | |
809 | that once thread_db is loaded, we'll still use it to list threads | |
810 | and associate pthread info with each LWP. */ | |
811 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
812 | return 0; |
813 | } | |
814 | ||
815 | struct counter | |
816 | { | |
817 | int pid; | |
818 | int count; | |
819 | }; | |
820 | ||
821 | static int | |
822 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
823 | { | |
824 | struct counter *counter = args; | |
825 | ||
826 | if (ptid_get_pid (entry->id) == counter->pid) | |
827 | { | |
828 | if (++counter->count > 1) | |
829 | return 1; | |
830 | } | |
d61ddec4 | 831 | |
da6d8c04 DJ |
832 | return 0; |
833 | } | |
834 | ||
95954743 | 835 | static int |
fa96cb38 | 836 | last_thread_of_process_p (int pid) |
95954743 | 837 | { |
95954743 | 838 | struct counter counter = { pid , 0 }; |
da6d8c04 | 839 | |
95954743 PA |
840 | return (find_inferior (&all_threads, |
841 | second_thread_of_pid_p, &counter) == NULL); | |
842 | } | |
843 | ||
da84f473 PA |
844 | /* Kill LWP. */ |
845 | ||
846 | static void | |
847 | linux_kill_one_lwp (struct lwp_info *lwp) | |
848 | { | |
d86d4aaf DE |
849 | struct thread_info *thr = get_lwp_thread (lwp); |
850 | int pid = lwpid_of (thr); | |
da84f473 PA |
851 | |
852 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
853 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
854 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
855 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
856 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
857 | per process, not one for each thread. But since we still support | |
858 | linuxthreads, and we also support debugging programs using raw | |
859 | clone without CLONE_THREAD, we send one for each thread. For | |
860 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
861 | about some old kernels where PTRACE_KILL might work better | |
862 | (dubious if there are any such, but that's why it's paranoia), so | |
863 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
864 | everywhere. */ | |
865 | ||
866 | errno = 0; | |
69ff6be5 | 867 | kill_lwp (pid, SIGKILL); |
da84f473 | 868 | if (debug_threads) |
ce9e3fe7 PA |
869 | { |
870 | int save_errno = errno; | |
871 | ||
872 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
873 | target_pid_to_str (ptid_of (thr)), | |
874 | save_errno ? strerror (save_errno) : "OK"); | |
875 | } | |
da84f473 PA |
876 | |
877 | errno = 0; | |
b8e1b30e | 878 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 879 | if (debug_threads) |
ce9e3fe7 PA |
880 | { |
881 | int save_errno = errno; | |
882 | ||
883 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
884 | target_pid_to_str (ptid_of (thr)), | |
885 | save_errno ? strerror (save_errno) : "OK"); | |
886 | } | |
da84f473 PA |
887 | } |
888 | ||
e76126e8 PA |
889 | /* Kill LWP and wait for it to die. */ |
890 | ||
891 | static void | |
892 | kill_wait_lwp (struct lwp_info *lwp) | |
893 | { | |
894 | struct thread_info *thr = get_lwp_thread (lwp); | |
895 | int pid = ptid_get_pid (ptid_of (thr)); | |
896 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
897 | int wstat; | |
898 | int res; | |
899 | ||
900 | if (debug_threads) | |
901 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
902 | ||
903 | do | |
904 | { | |
905 | linux_kill_one_lwp (lwp); | |
906 | ||
907 | /* Make sure it died. Notes: | |
908 | ||
909 | - The loop is most likely unnecessary. | |
910 | ||
911 | - We don't use linux_wait_for_event as that could delete lwps | |
912 | while we're iterating over them. We're not interested in | |
913 | any pending status at this point, only in making sure all | |
914 | wait status on the kernel side are collected until the | |
915 | process is reaped. | |
916 | ||
917 | - We don't use __WALL here as the __WALL emulation relies on | |
918 | SIGCHLD, and killing a stopped process doesn't generate | |
919 | one, nor an exit status. | |
920 | */ | |
921 | res = my_waitpid (lwpid, &wstat, 0); | |
922 | if (res == -1 && errno == ECHILD) | |
923 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
924 | } while (res > 0 && WIFSTOPPED (wstat)); | |
925 | ||
926 | gdb_assert (res > 0); | |
927 | } | |
928 | ||
da84f473 PA |
929 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
930 | except the leader. */ | |
95954743 PA |
931 | |
932 | static int | |
da84f473 | 933 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 934 | { |
0d62e5e8 | 935 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 936 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
937 | int pid = * (int *) args; |
938 | ||
939 | if (ptid_get_pid (entry->id) != pid) | |
940 | return 0; | |
0d62e5e8 | 941 | |
fd500816 DJ |
942 | /* We avoid killing the first thread here, because of a Linux kernel (at |
943 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
944 | the children get a chance to be reaped, it will remain a zombie | |
945 | forever. */ | |
95954743 | 946 | |
d86d4aaf | 947 | if (lwpid_of (thread) == pid) |
95954743 PA |
948 | { |
949 | if (debug_threads) | |
87ce2a04 DE |
950 | debug_printf ("lkop: is last of process %s\n", |
951 | target_pid_to_str (entry->id)); | |
95954743 PA |
952 | return 0; |
953 | } | |
fd500816 | 954 | |
e76126e8 | 955 | kill_wait_lwp (lwp); |
95954743 | 956 | return 0; |
da6d8c04 DJ |
957 | } |
958 | ||
95954743 PA |
959 | static int |
960 | linux_kill (int pid) | |
0d62e5e8 | 961 | { |
95954743 | 962 | struct process_info *process; |
54a0b537 | 963 | struct lwp_info *lwp; |
fd500816 | 964 | |
95954743 PA |
965 | process = find_process_pid (pid); |
966 | if (process == NULL) | |
967 | return -1; | |
9d606399 | 968 | |
f9e39928 PA |
969 | /* If we're killing a running inferior, make sure it is stopped |
970 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 971 | stop_all_lwps (0, NULL); |
f9e39928 | 972 | |
da84f473 | 973 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 974 | |
54a0b537 | 975 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 976 | thread in the list, so do so now. */ |
95954743 | 977 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 978 | |
784867a5 | 979 | if (lwp == NULL) |
fd500816 | 980 | { |
784867a5 | 981 | if (debug_threads) |
d86d4aaf DE |
982 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
983 | pid); | |
784867a5 JK |
984 | } |
985 | else | |
e76126e8 | 986 | kill_wait_lwp (lwp); |
2d717e4f | 987 | |
8336d594 | 988 | the_target->mourn (process); |
f9e39928 PA |
989 | |
990 | /* Since we presently can only stop all lwps of all processes, we | |
991 | need to unstop lwps of other processes. */ | |
7984d532 | 992 | unstop_all_lwps (0, NULL); |
95954743 | 993 | return 0; |
0d62e5e8 DJ |
994 | } |
995 | ||
9b224c5e PA |
996 | /* Get pending signal of THREAD, for detaching purposes. This is the |
997 | signal the thread last stopped for, which we need to deliver to the | |
998 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
999 | ||
1000 | static int | |
1001 | get_detach_signal (struct thread_info *thread) | |
1002 | { | |
a493e3e2 | 1003 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1004 | int status; |
1005 | struct lwp_info *lp = get_thread_lwp (thread); | |
1006 | ||
1007 | if (lp->status_pending_p) | |
1008 | status = lp->status_pending; | |
1009 | else | |
1010 | { | |
1011 | /* If the thread had been suspended by gdbserver, and it stopped | |
1012 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1013 | want to deliver that SIGSTOP. */ | |
1014 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1015 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1016 | return 0; |
1017 | ||
1018 | /* Otherwise, we may need to deliver the signal we | |
1019 | intercepted. */ | |
1020 | status = lp->last_status; | |
1021 | } | |
1022 | ||
1023 | if (!WIFSTOPPED (status)) | |
1024 | { | |
1025 | if (debug_threads) | |
87ce2a04 | 1026 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1027 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1032 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1033 | { |
1034 | if (debug_threads) | |
87ce2a04 DE |
1035 | debug_printf ("GPS: lwp %s had stopped with extended " |
1036 | "status: no pending signal\n", | |
d86d4aaf | 1037 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1038 | return 0; |
1039 | } | |
1040 | ||
2ea28649 | 1041 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1042 | |
1043 | if (program_signals_p && !program_signals[signo]) | |
1044 | { | |
1045 | if (debug_threads) | |
87ce2a04 | 1046 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1047 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1048 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1049 | return 0; |
1050 | } | |
1051 | else if (!program_signals_p | |
1052 | /* If we have no way to know which signals GDB does not | |
1053 | want to have passed to the program, assume | |
1054 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1055 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1056 | { |
1057 | if (debug_threads) | |
87ce2a04 DE |
1058 | debug_printf ("GPS: lwp %s had signal %s, " |
1059 | "but we don't know if we should pass it. " | |
1060 | "Default to not.\n", | |
d86d4aaf | 1061 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1062 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1063 | return 0; |
1064 | } | |
1065 | else | |
1066 | { | |
1067 | if (debug_threads) | |
87ce2a04 | 1068 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1069 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1070 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1071 | |
1072 | return WSTOPSIG (status); | |
1073 | } | |
1074 | } | |
1075 | ||
95954743 PA |
1076 | static int |
1077 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1078 | { |
1079 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1080 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1081 | int pid = * (int *) args; |
9b224c5e | 1082 | int sig; |
95954743 PA |
1083 | |
1084 | if (ptid_get_pid (entry->id) != pid) | |
1085 | return 0; | |
6ad8ae5c | 1086 | |
9b224c5e | 1087 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1088 | if (lwp->stop_expected) |
ae13219e | 1089 | { |
9b224c5e | 1090 | if (debug_threads) |
87ce2a04 | 1091 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1092 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1093 | |
d86d4aaf | 1094 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1095 | lwp->stop_expected = 0; |
ae13219e DJ |
1096 | } |
1097 | ||
1098 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1099 | regcache_invalidate_thread (thread); |
ae13219e | 1100 | |
9b224c5e PA |
1101 | /* Pass on any pending signal for this thread. */ |
1102 | sig = get_detach_signal (thread); | |
1103 | ||
ae13219e | 1104 | /* Finally, let it resume. */ |
82bfbe7e PA |
1105 | if (the_low_target.prepare_to_resume != NULL) |
1106 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1107 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1108 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1109 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1110 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1111 | strerror (errno)); |
bd99dc85 PA |
1112 | |
1113 | delete_lwp (lwp); | |
95954743 | 1114 | return 0; |
6ad8ae5c DJ |
1115 | } |
1116 | ||
95954743 PA |
1117 | static int |
1118 | linux_detach (int pid) | |
1119 | { | |
1120 | struct process_info *process; | |
1121 | ||
1122 | process = find_process_pid (pid); | |
1123 | if (process == NULL) | |
1124 | return -1; | |
1125 | ||
f9e39928 PA |
1126 | /* Stop all threads before detaching. First, ptrace requires that |
1127 | the thread is stopped to sucessfully detach. Second, thread_db | |
1128 | may need to uninstall thread event breakpoints from memory, which | |
1129 | only works with a stopped process anyway. */ | |
7984d532 | 1130 | stop_all_lwps (0, NULL); |
f9e39928 | 1131 | |
ca5c370d | 1132 | #ifdef USE_THREAD_DB |
8336d594 | 1133 | thread_db_detach (process); |
ca5c370d PA |
1134 | #endif |
1135 | ||
fa593d66 PA |
1136 | /* Stabilize threads (move out of jump pads). */ |
1137 | stabilize_threads (); | |
1138 | ||
95954743 | 1139 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1140 | |
1141 | the_target->mourn (process); | |
f9e39928 PA |
1142 | |
1143 | /* Since we presently can only stop all lwps of all processes, we | |
1144 | need to unstop lwps of other processes. */ | |
7984d532 | 1145 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1146 | return 0; |
1147 | } | |
1148 | ||
1149 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1150 | ||
1151 | static int | |
1152 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1153 | { | |
d86d4aaf DE |
1154 | struct thread_info *thread = (struct thread_info *) entry; |
1155 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1156 | struct process_info *process = proc; |
1157 | ||
d86d4aaf | 1158 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1159 | delete_lwp (lwp); |
1160 | ||
dd6953e1 | 1161 | return 0; |
6ad8ae5c DJ |
1162 | } |
1163 | ||
8336d594 PA |
1164 | static void |
1165 | linux_mourn (struct process_info *process) | |
1166 | { | |
1167 | struct process_info_private *priv; | |
1168 | ||
1169 | #ifdef USE_THREAD_DB | |
1170 | thread_db_mourn (process); | |
1171 | #endif | |
1172 | ||
d86d4aaf | 1173 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1174 | |
8336d594 PA |
1175 | /* Freeing all private data. */ |
1176 | priv = process->private; | |
1177 | free (priv->arch_private); | |
1178 | free (priv); | |
1179 | process->private = NULL; | |
505106cd PA |
1180 | |
1181 | remove_process (process); | |
8336d594 PA |
1182 | } |
1183 | ||
444d6139 | 1184 | static void |
95954743 | 1185 | linux_join (int pid) |
444d6139 | 1186 | { |
444d6139 PA |
1187 | int status, ret; |
1188 | ||
1189 | do { | |
95954743 | 1190 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1191 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1192 | break; | |
1193 | } while (ret != -1 || errno != ECHILD); | |
1194 | } | |
1195 | ||
6ad8ae5c | 1196 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1197 | static int |
95954743 | 1198 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1199 | { |
95954743 PA |
1200 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1201 | ||
1202 | /* We assume we always know if a thread exits. If a whole process | |
1203 | exited but we still haven't been able to report it to GDB, we'll | |
1204 | hold on to the last lwp of the dead process. */ | |
1205 | if (lwp != NULL) | |
1206 | return !lwp->dead; | |
0d62e5e8 DJ |
1207 | else |
1208 | return 0; | |
1209 | } | |
1210 | ||
582511be PA |
1211 | /* Return 1 if this lwp still has an interesting status pending. If |
1212 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1213 | false. */ | |
1214 | ||
1215 | static int | |
1216 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1217 | { | |
1218 | struct lwp_info *lp = get_thread_lwp (thread); | |
1219 | ||
1220 | if (!lp->status_pending_p) | |
1221 | return 0; | |
1222 | ||
1223 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1224 | report any status pending the LWP may have. */ | |
1225 | if (thread->last_resume_kind == resume_stop | |
1226 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1227 | return 0; | |
1228 | ||
1229 | if (thread->last_resume_kind != resume_stop | |
1230 | && (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1231 | || lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT)) | |
1232 | { | |
1233 | struct thread_info *saved_thread; | |
1234 | CORE_ADDR pc; | |
1235 | int discard = 0; | |
1236 | ||
1237 | gdb_assert (lp->last_status != 0); | |
1238 | ||
1239 | pc = get_pc (lp); | |
1240 | ||
1241 | saved_thread = current_thread; | |
1242 | current_thread = thread; | |
1243 | ||
1244 | if (pc != lp->stop_pc) | |
1245 | { | |
1246 | if (debug_threads) | |
1247 | debug_printf ("PC of %ld changed\n", | |
1248 | lwpid_of (thread)); | |
1249 | discard = 1; | |
1250 | } | |
1251 | else if (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1252 | && !(*the_low_target.breakpoint_at) (pc)) | |
1253 | { | |
1254 | if (debug_threads) | |
1255 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1256 | lwpid_of (thread)); | |
1257 | discard = 1; | |
1258 | } | |
1259 | else if (lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT | |
1260 | && !hardware_breakpoint_inserted_here (pc)) | |
1261 | { | |
1262 | if (debug_threads) | |
1263 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1264 | lwpid_of (thread)); | |
1265 | discard = 1; | |
1266 | } | |
1267 | ||
1268 | current_thread = saved_thread; | |
1269 | ||
1270 | if (discard) | |
1271 | { | |
1272 | if (debug_threads) | |
1273 | debug_printf ("discarding pending breakpoint status\n"); | |
1274 | lp->status_pending_p = 0; | |
1275 | return 0; | |
1276 | } | |
1277 | } | |
1278 | ||
1279 | return 1; | |
1280 | } | |
1281 | ||
6bf5e0ba | 1282 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1283 | static int |
d50171e4 | 1284 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1285 | { |
d86d4aaf | 1286 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1287 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1288 | ptid_t ptid = * (ptid_t *) arg; |
1289 | ||
1290 | /* Check if we're only interested in events from a specific process | |
1291 | or its lwps. */ | |
1292 | if (!ptid_equal (minus_one_ptid, ptid) | |
d86d4aaf | 1293 | && ptid_get_pid (ptid) != ptid_get_pid (thread->entry.id)) |
95954743 | 1294 | return 0; |
0d62e5e8 | 1295 | |
582511be PA |
1296 | if (lp->status_pending_p |
1297 | && !thread_still_has_status_pending_p (thread)) | |
1298 | { | |
1299 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1300 | return 0; | |
1301 | } | |
0d62e5e8 | 1302 | |
582511be | 1303 | return lp->status_pending_p; |
0d62e5e8 DJ |
1304 | } |
1305 | ||
95954743 PA |
1306 | static int |
1307 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1308 | { | |
1309 | ptid_t ptid = *(ptid_t *) data; | |
1310 | int lwp; | |
1311 | ||
1312 | if (ptid_get_lwp (ptid) != 0) | |
1313 | lwp = ptid_get_lwp (ptid); | |
1314 | else | |
1315 | lwp = ptid_get_pid (ptid); | |
1316 | ||
1317 | if (ptid_get_lwp (entry->id) == lwp) | |
1318 | return 1; | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | struct lwp_info * | |
1324 | find_lwp_pid (ptid_t ptid) | |
1325 | { | |
d86d4aaf DE |
1326 | struct inferior_list_entry *thread |
1327 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1328 | ||
1329 | if (thread == NULL) | |
1330 | return NULL; | |
1331 | ||
1332 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1333 | } |
1334 | ||
fa96cb38 | 1335 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1336 | |
fa96cb38 PA |
1337 | static int |
1338 | num_lwps (int pid) | |
1339 | { | |
1340 | struct inferior_list_entry *inf, *tmp; | |
1341 | int count = 0; | |
0d62e5e8 | 1342 | |
fa96cb38 | 1343 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1344 | { |
fa96cb38 PA |
1345 | if (ptid_get_pid (inf->id) == pid) |
1346 | count++; | |
24a09b5f | 1347 | } |
3aee8918 | 1348 | |
fa96cb38 PA |
1349 | return count; |
1350 | } | |
d61ddec4 | 1351 | |
fa96cb38 PA |
1352 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1353 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1354 | |
fa96cb38 PA |
1355 | static void |
1356 | check_zombie_leaders (void) | |
1357 | { | |
1358 | struct process_info *proc, *tmp; | |
c3adc08c | 1359 | |
fa96cb38 | 1360 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1361 | { |
fa96cb38 PA |
1362 | pid_t leader_pid = pid_of (proc); |
1363 | struct lwp_info *leader_lp; | |
c3adc08c | 1364 | |
fa96cb38 | 1365 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1366 | |
fa96cb38 PA |
1367 | if (debug_threads) |
1368 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1369 | "num_lwps=%d, zombie=%d\n", | |
1370 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1371 | linux_proc_pid_is_zombie (leader_pid)); | |
1372 | ||
1373 | if (leader_lp != NULL | |
1374 | /* Check if there are other threads in the group, as we may | |
1375 | have raced with the inferior simply exiting. */ | |
1376 | && !last_thread_of_process_p (leader_pid) | |
1377 | && linux_proc_pid_is_zombie (leader_pid)) | |
1378 | { | |
1379 | /* A leader zombie can mean one of two things: | |
1380 | ||
1381 | - It exited, and there's an exit status pending | |
1382 | available, or only the leader exited (not the whole | |
1383 | program). In the latter case, we can't waitpid the | |
1384 | leader's exit status until all other threads are gone. | |
1385 | ||
1386 | - There are 3 or more threads in the group, and a thread | |
1387 | other than the leader exec'd. On an exec, the Linux | |
1388 | kernel destroys all other threads (except the execing | |
1389 | one) in the thread group, and resets the execing thread's | |
1390 | tid to the tgid. No exit notification is sent for the | |
1391 | execing thread -- from the ptracer's perspective, it | |
1392 | appears as though the execing thread just vanishes. | |
1393 | Until we reap all other threads except the leader and the | |
1394 | execing thread, the leader will be zombie, and the | |
1395 | execing thread will be in `D (disc sleep)'. As soon as | |
1396 | all other threads are reaped, the execing thread changes | |
1397 | it's tid to the tgid, and the previous (zombie) leader | |
1398 | vanishes, giving place to the "new" leader. We could try | |
1399 | distinguishing the exit and exec cases, by waiting once | |
1400 | more, and seeing if something comes out, but it doesn't | |
1401 | sound useful. The previous leader _does_ go away, and | |
1402 | we'll re-add the new one once we see the exec event | |
1403 | (which is just the same as what would happen if the | |
1404 | previous leader did exit voluntarily before some other | |
1405 | thread execs). */ | |
c3adc08c | 1406 | |
fa96cb38 PA |
1407 | if (debug_threads) |
1408 | fprintf (stderr, | |
1409 | "CZL: Thread group leader %d zombie " | |
1410 | "(it exited, or another thread execd).\n", | |
1411 | leader_pid); | |
c3adc08c | 1412 | |
fa96cb38 | 1413 | delete_lwp (leader_lp); |
c3adc08c PA |
1414 | } |
1415 | } | |
fa96cb38 | 1416 | } |
c3adc08c | 1417 | |
fa96cb38 PA |
1418 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1419 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1420 | |
fa96cb38 PA |
1421 | static int |
1422 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1423 | { | |
1424 | struct thread_info *thr = (struct thread_info *) entry; | |
1425 | struct lwp_info *lwp; | |
1426 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1427 | |
fa96cb38 PA |
1428 | if (!ptid_match (ptid_of (thr), filter)) |
1429 | return 0; | |
bd99dc85 | 1430 | |
fa96cb38 PA |
1431 | lwp = get_thread_lwp (thr); |
1432 | if (!lwp->stopped) | |
1433 | return 1; | |
1434 | ||
1435 | return 0; | |
0d62e5e8 | 1436 | } |
611cb4a5 | 1437 | |
219f2f23 PA |
1438 | /* This function should only be called if the LWP got a SIGTRAP. |
1439 | ||
1440 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1441 | event was handled, 0 otherwise. */ | |
1442 | ||
1443 | static int | |
1444 | handle_tracepoints (struct lwp_info *lwp) | |
1445 | { | |
1446 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1447 | int tpoint_related_event = 0; | |
1448 | ||
582511be PA |
1449 | gdb_assert (lwp->suspended == 0); |
1450 | ||
7984d532 PA |
1451 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1452 | uninsert tracepoints. To do this, we temporarily pause all | |
1453 | threads, unpatch away, and then unpause threads. We need to make | |
1454 | sure the unpausing doesn't resume LWP too. */ | |
1455 | lwp->suspended++; | |
1456 | ||
219f2f23 PA |
1457 | /* And we need to be sure that any all-threads-stopping doesn't try |
1458 | to move threads out of the jump pads, as it could deadlock the | |
1459 | inferior (LWP could be in the jump pad, maybe even holding the | |
1460 | lock.) */ | |
1461 | ||
1462 | /* Do any necessary step collect actions. */ | |
1463 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1464 | ||
fa593d66 PA |
1465 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1466 | ||
219f2f23 PA |
1467 | /* See if we just hit a tracepoint and do its main collect |
1468 | actions. */ | |
1469 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1470 | ||
7984d532 PA |
1471 | lwp->suspended--; |
1472 | ||
1473 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1474 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1475 | |
219f2f23 PA |
1476 | if (tpoint_related_event) |
1477 | { | |
1478 | if (debug_threads) | |
87ce2a04 | 1479 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1480 | return 1; |
1481 | } | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
fa593d66 PA |
1486 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1487 | fast tracepoint. */ | |
1488 | ||
1489 | static int | |
1490 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1491 | struct fast_tpoint_collect_status *status) | |
1492 | { | |
1493 | CORE_ADDR thread_area; | |
d86d4aaf | 1494 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1495 | |
1496 | if (the_low_target.get_thread_area == NULL) | |
1497 | return 0; | |
1498 | ||
1499 | /* Get the thread area address. This is used to recognize which | |
1500 | thread is which when tracing with the in-process agent library. | |
1501 | We don't read anything from the address, and treat it as opaque; | |
1502 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1503 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1504 | return 0; |
1505 | ||
1506 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1507 | } | |
1508 | ||
1509 | /* The reason we resume in the caller, is because we want to be able | |
1510 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1511 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1512 | refuses to resume. */ | |
1513 | ||
1514 | static int | |
1515 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1516 | { | |
0bfdf32f | 1517 | struct thread_info *saved_thread; |
fa593d66 | 1518 | |
0bfdf32f GB |
1519 | saved_thread = current_thread; |
1520 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1521 | |
1522 | if ((wstat == NULL | |
1523 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1524 | && supports_fast_tracepoints () | |
58b4daa5 | 1525 | && agent_loaded_p ()) |
fa593d66 PA |
1526 | { |
1527 | struct fast_tpoint_collect_status status; | |
1528 | int r; | |
1529 | ||
1530 | if (debug_threads) | |
87ce2a04 DE |
1531 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1532 | "jump pad.\n", | |
0bfdf32f | 1533 | lwpid_of (current_thread)); |
fa593d66 PA |
1534 | |
1535 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1536 | ||
1537 | if (wstat == NULL | |
1538 | || (WSTOPSIG (*wstat) != SIGILL | |
1539 | && WSTOPSIG (*wstat) != SIGFPE | |
1540 | && WSTOPSIG (*wstat) != SIGSEGV | |
1541 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1542 | { | |
1543 | lwp->collecting_fast_tracepoint = r; | |
1544 | ||
1545 | if (r != 0) | |
1546 | { | |
1547 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1548 | { | |
1549 | /* Haven't executed the original instruction yet. | |
1550 | Set breakpoint there, and wait till it's hit, | |
1551 | then single-step until exiting the jump pad. */ | |
1552 | lwp->exit_jump_pad_bkpt | |
1553 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1554 | } | |
1555 | ||
1556 | if (debug_threads) | |
87ce2a04 DE |
1557 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1558 | "the jump pad...it does\n", | |
0bfdf32f GB |
1559 | lwpid_of (current_thread)); |
1560 | current_thread = saved_thread; | |
fa593d66 PA |
1561 | |
1562 | return 1; | |
1563 | } | |
1564 | } | |
1565 | else | |
1566 | { | |
1567 | /* If we get a synchronous signal while collecting, *and* | |
1568 | while executing the (relocated) original instruction, | |
1569 | reset the PC to point at the tpoint address, before | |
1570 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1571 | report the signal to GDB, and pray for the best. */ | |
1572 | ||
1573 | lwp->collecting_fast_tracepoint = 0; | |
1574 | ||
1575 | if (r != 0 | |
1576 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1577 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1578 | { | |
1579 | siginfo_t info; | |
1580 | struct regcache *regcache; | |
1581 | ||
1582 | /* The si_addr on a few signals references the address | |
1583 | of the faulting instruction. Adjust that as | |
1584 | well. */ | |
1585 | if ((WSTOPSIG (*wstat) == SIGILL | |
1586 | || WSTOPSIG (*wstat) == SIGFPE | |
1587 | || WSTOPSIG (*wstat) == SIGBUS | |
1588 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1589 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1590 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1591 | /* Final check just to make sure we don't clobber |
1592 | the siginfo of non-kernel-sent signals. */ | |
1593 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1594 | { | |
1595 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1596 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1597 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1598 | } |
1599 | ||
0bfdf32f | 1600 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1601 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1602 | lwp->stop_pc = status.tpoint_addr; | |
1603 | ||
1604 | /* Cancel any fast tracepoint lock this thread was | |
1605 | holding. */ | |
1606 | force_unlock_trace_buffer (); | |
1607 | } | |
1608 | ||
1609 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1610 | { | |
1611 | if (debug_threads) | |
87ce2a04 DE |
1612 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1613 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1614 | |
1615 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1616 | |
1617 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1618 | lwp->exit_jump_pad_bkpt = NULL; | |
1619 | ||
1620 | unstop_all_lwps (1, lwp); | |
1621 | ||
1622 | gdb_assert (lwp->suspended >= 0); | |
1623 | } | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | if (debug_threads) | |
87ce2a04 DE |
1628 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1629 | "jump pad...no\n", | |
0bfdf32f | 1630 | lwpid_of (current_thread)); |
0cccb683 | 1631 | |
0bfdf32f | 1632 | current_thread = saved_thread; |
fa593d66 PA |
1633 | return 0; |
1634 | } | |
1635 | ||
1636 | /* Enqueue one signal in the "signals to report later when out of the | |
1637 | jump pad" list. */ | |
1638 | ||
1639 | static void | |
1640 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1641 | { | |
1642 | struct pending_signals *p_sig; | |
d86d4aaf | 1643 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1644 | |
1645 | if (debug_threads) | |
87ce2a04 | 1646 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1647 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1648 | |
1649 | if (debug_threads) | |
1650 | { | |
1651 | struct pending_signals *sig; | |
1652 | ||
1653 | for (sig = lwp->pending_signals_to_report; | |
1654 | sig != NULL; | |
1655 | sig = sig->prev) | |
87ce2a04 DE |
1656 | debug_printf (" Already queued %d\n", |
1657 | sig->signal); | |
fa593d66 | 1658 | |
87ce2a04 | 1659 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1660 | } |
1661 | ||
1a981360 PA |
1662 | /* Don't enqueue non-RT signals if they are already in the deferred |
1663 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1664 | twice) */ | |
1665 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1666 | { | |
1667 | struct pending_signals *sig; | |
1668 | ||
1669 | for (sig = lwp->pending_signals_to_report; | |
1670 | sig != NULL; | |
1671 | sig = sig->prev) | |
1672 | { | |
1673 | if (sig->signal == WSTOPSIG (*wstat)) | |
1674 | { | |
1675 | if (debug_threads) | |
87ce2a04 DE |
1676 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1677 | " for LWP %ld\n", | |
1678 | sig->signal, | |
d86d4aaf | 1679 | lwpid_of (thread)); |
1a981360 PA |
1680 | return; |
1681 | } | |
1682 | } | |
1683 | } | |
1684 | ||
fa593d66 PA |
1685 | p_sig = xmalloc (sizeof (*p_sig)); |
1686 | p_sig->prev = lwp->pending_signals_to_report; | |
1687 | p_sig->signal = WSTOPSIG (*wstat); | |
1688 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1689 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1690 | &p_sig->info); |
fa593d66 PA |
1691 | |
1692 | lwp->pending_signals_to_report = p_sig; | |
1693 | } | |
1694 | ||
1695 | /* Dequeue one signal from the "signals to report later when out of | |
1696 | the jump pad" list. */ | |
1697 | ||
1698 | static int | |
1699 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1700 | { | |
d86d4aaf DE |
1701 | struct thread_info *thread = get_lwp_thread (lwp); |
1702 | ||
fa593d66 PA |
1703 | if (lwp->pending_signals_to_report != NULL) |
1704 | { | |
1705 | struct pending_signals **p_sig; | |
1706 | ||
1707 | p_sig = &lwp->pending_signals_to_report; | |
1708 | while ((*p_sig)->prev != NULL) | |
1709 | p_sig = &(*p_sig)->prev; | |
1710 | ||
1711 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1712 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1713 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1714 | &(*p_sig)->info); |
fa593d66 PA |
1715 | free (*p_sig); |
1716 | *p_sig = NULL; | |
1717 | ||
1718 | if (debug_threads) | |
87ce2a04 | 1719 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1720 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1721 | |
1722 | if (debug_threads) | |
1723 | { | |
1724 | struct pending_signals *sig; | |
1725 | ||
1726 | for (sig = lwp->pending_signals_to_report; | |
1727 | sig != NULL; | |
1728 | sig = sig->prev) | |
87ce2a04 DE |
1729 | debug_printf (" Still queued %d\n", |
1730 | sig->signal); | |
fa593d66 | 1731 | |
87ce2a04 | 1732 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1733 | } |
1734 | ||
1735 | return 1; | |
1736 | } | |
1737 | ||
1738 | return 0; | |
1739 | } | |
1740 | ||
582511be | 1741 | /* Return true if the event in LP may be caused by breakpoint. */ |
d50171e4 PA |
1742 | |
1743 | static int | |
582511be | 1744 | wstatus_maybe_breakpoint (int wstatus) |
d50171e4 | 1745 | { |
582511be PA |
1746 | return (WIFSTOPPED (wstatus) |
1747 | && (WSTOPSIG (wstatus) == SIGTRAP | |
1748 | /* SIGILL and SIGSEGV are also treated as traps in case a | |
1749 | breakpoint is inserted at the current PC. */ | |
1750 | || WSTOPSIG (wstatus) == SIGILL | |
1751 | || WSTOPSIG (wstatus) == SIGSEGV)); | |
1752 | } | |
d50171e4 | 1753 | |
582511be PA |
1754 | /* Fetch the possibly triggered data watchpoint info and store it in |
1755 | CHILD. | |
d50171e4 | 1756 | |
582511be PA |
1757 | On some archs, like x86, that use debug registers to set |
1758 | watchpoints, it's possible that the way to know which watched | |
1759 | address trapped, is to check the register that is used to select | |
1760 | which address to watch. Problem is, between setting the watchpoint | |
1761 | and reading back which data address trapped, the user may change | |
1762 | the set of watchpoints, and, as a consequence, GDB changes the | |
1763 | debug registers in the inferior. To avoid reading back a stale | |
1764 | stopped-data-address when that happens, we cache in LP the fact | |
1765 | that a watchpoint trapped, and the corresponding data address, as | |
1766 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
1767 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 1768 | |
582511be PA |
1769 | static int |
1770 | check_stopped_by_watchpoint (struct lwp_info *child) | |
1771 | { | |
1772 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 1773 | { |
582511be | 1774 | struct thread_info *saved_thread; |
d50171e4 | 1775 | |
582511be PA |
1776 | saved_thread = current_thread; |
1777 | current_thread = get_lwp_thread (child); | |
1778 | ||
1779 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 1780 | { |
582511be PA |
1781 | child->stop_reason = LWP_STOPPED_BY_WATCHPOINT; |
1782 | ||
1783 | if (the_low_target.stopped_data_address != NULL) | |
1784 | child->stopped_data_address | |
1785 | = the_low_target.stopped_data_address (); | |
1786 | else | |
1787 | child->stopped_data_address = 0; | |
d50171e4 PA |
1788 | } |
1789 | ||
0bfdf32f | 1790 | current_thread = saved_thread; |
d50171e4 PA |
1791 | } |
1792 | ||
582511be | 1793 | return child->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
1794 | } |
1795 | ||
fa96cb38 PA |
1796 | /* Do low-level handling of the event, and check if we should go on |
1797 | and pass it to caller code. Return the affected lwp if we are, or | |
1798 | NULL otherwise. */ | |
1799 | ||
1800 | static struct lwp_info * | |
582511be | 1801 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
1802 | { |
1803 | struct lwp_info *child; | |
1804 | struct thread_info *thread; | |
582511be | 1805 | int have_stop_pc = 0; |
fa96cb38 PA |
1806 | |
1807 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1808 | ||
1809 | /* If we didn't find a process, one of two things presumably happened: | |
1810 | - A process we started and then detached from has exited. Ignore it. | |
1811 | - A process we are controlling has forked and the new child's stop | |
1812 | was reported to us by the kernel. Save its PID. */ | |
1813 | if (child == NULL && WIFSTOPPED (wstat)) | |
1814 | { | |
1815 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1816 | return NULL; | |
1817 | } | |
1818 | else if (child == NULL) | |
1819 | return NULL; | |
1820 | ||
1821 | thread = get_lwp_thread (child); | |
1822 | ||
1823 | child->stopped = 1; | |
1824 | ||
1825 | child->last_status = wstat; | |
1826 | ||
582511be PA |
1827 | /* Check if the thread has exited. */ |
1828 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
1829 | { | |
1830 | if (debug_threads) | |
1831 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
1832 | if (num_lwps (pid_of (thread)) > 1) | |
1833 | { | |
1834 | ||
1835 | /* If there is at least one more LWP, then the exit signal was | |
1836 | not the end of the debugged application and should be | |
1837 | ignored. */ | |
1838 | delete_lwp (child); | |
1839 | return NULL; | |
1840 | } | |
1841 | else | |
1842 | { | |
1843 | /* This was the last lwp in the process. Since events are | |
1844 | serialized to GDB core, and we can't report this one | |
1845 | right now, but GDB core and the other target layers will | |
1846 | want to be notified about the exit code/signal, leave the | |
1847 | status pending for the next time we're able to report | |
1848 | it. */ | |
1849 | mark_lwp_dead (child, wstat); | |
1850 | return child; | |
1851 | } | |
1852 | } | |
1853 | ||
1854 | gdb_assert (WIFSTOPPED (wstat)); | |
1855 | ||
fa96cb38 PA |
1856 | if (WIFSTOPPED (wstat)) |
1857 | { | |
1858 | struct process_info *proc; | |
1859 | ||
1860 | /* Architecture-specific setup after inferior is running. This | |
1861 | needs to happen after we have attached to the inferior and it | |
1862 | is stopped for the first time, but before we access any | |
1863 | inferior registers. */ | |
1864 | proc = find_process_pid (pid_of (thread)); | |
1865 | if (proc->private->new_inferior) | |
1866 | { | |
0bfdf32f | 1867 | struct thread_info *saved_thread; |
fa96cb38 | 1868 | |
0bfdf32f GB |
1869 | saved_thread = current_thread; |
1870 | current_thread = thread; | |
fa96cb38 PA |
1871 | |
1872 | the_low_target.arch_setup (); | |
1873 | ||
0bfdf32f | 1874 | current_thread = saved_thread; |
fa96cb38 PA |
1875 | |
1876 | proc->private->new_inferior = 0; | |
1877 | } | |
1878 | } | |
1879 | ||
fa96cb38 PA |
1880 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
1881 | { | |
beed38b8 JB |
1882 | struct process_info *proc = find_process_pid (pid_of (thread)); |
1883 | ||
1884 | linux_enable_event_reporting (lwpid, proc->attached); | |
fa96cb38 PA |
1885 | child->must_set_ptrace_flags = 0; |
1886 | } | |
1887 | ||
582511be PA |
1888 | /* Be careful to not overwrite stop_pc until |
1889 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 1890 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 1891 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 1892 | { |
582511be | 1893 | child->stop_pc = get_pc (child); |
fa96cb38 PA |
1894 | handle_extended_wait (child, wstat); |
1895 | return NULL; | |
1896 | } | |
1897 | ||
582511be PA |
1898 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
1899 | && check_stopped_by_watchpoint (child)) | |
1900 | ; | |
1901 | else if (WIFSTOPPED (wstat) && wstatus_maybe_breakpoint (wstat)) | |
1902 | { | |
1903 | if (check_stopped_by_breakpoint (child)) | |
1904 | have_stop_pc = 1; | |
1905 | } | |
1906 | ||
1907 | if (!have_stop_pc) | |
1908 | child->stop_pc = get_pc (child); | |
1909 | ||
fa96cb38 PA |
1910 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
1911 | && child->stop_expected) | |
1912 | { | |
1913 | if (debug_threads) | |
1914 | debug_printf ("Expected stop.\n"); | |
1915 | child->stop_expected = 0; | |
1916 | ||
1917 | if (thread->last_resume_kind == resume_stop) | |
1918 | { | |
1919 | /* We want to report the stop to the core. Treat the | |
1920 | SIGSTOP as a normal event. */ | |
1921 | } | |
1922 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1923 | { | |
1924 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 1925 | pending. */ |
fa96cb38 PA |
1926 | return NULL; |
1927 | } | |
1928 | else | |
1929 | { | |
1930 | /* Filter out the event. */ | |
1931 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1932 | return NULL; | |
1933 | } | |
1934 | } | |
1935 | ||
582511be PA |
1936 | child->status_pending_p = 1; |
1937 | child->status_pending = wstat; | |
fa96cb38 PA |
1938 | return child; |
1939 | } | |
1940 | ||
20ba1ce6 PA |
1941 | /* Resume LWPs that are currently stopped without any pending status |
1942 | to report, but are resumed from the core's perspective. */ | |
1943 | ||
1944 | static void | |
1945 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
1946 | { | |
1947 | struct thread_info *thread = (struct thread_info *) entry; | |
1948 | struct lwp_info *lp = get_thread_lwp (thread); | |
1949 | ||
1950 | if (lp->stopped | |
1951 | && !lp->status_pending_p | |
1952 | && thread->last_resume_kind != resume_stop | |
1953 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1954 | { | |
1955 | int step = thread->last_resume_kind == resume_step; | |
1956 | ||
1957 | if (debug_threads) | |
1958 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
1959 | target_pid_to_str (ptid_of (thread)), | |
1960 | paddress (lp->stop_pc), | |
1961 | step); | |
1962 | ||
1963 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
1964 | } | |
1965 | } | |
1966 | ||
fa96cb38 PA |
1967 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1968 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1969 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1970 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1971 | the stop status through the status pointer WSTAT. OPTIONS is | |
1972 | passed to the waitpid call. Return 0 if no event was found and | |
1973 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1974 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1975 | |
0d62e5e8 | 1976 | static int |
fa96cb38 PA |
1977 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1978 | int *wstatp, int options) | |
0d62e5e8 | 1979 | { |
d86d4aaf | 1980 | struct thread_info *event_thread; |
d50171e4 | 1981 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1982 | sigset_t block_mask, prev_mask; |
d50171e4 | 1983 | |
fa96cb38 | 1984 | retry: |
d86d4aaf DE |
1985 | /* N.B. event_thread points to the thread_info struct that contains |
1986 | event_child. Keep them in sync. */ | |
1987 | event_thread = NULL; | |
d50171e4 PA |
1988 | event_child = NULL; |
1989 | requested_child = NULL; | |
0d62e5e8 | 1990 | |
95954743 | 1991 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1992 | |
fa96cb38 | 1993 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 1994 | { |
d86d4aaf | 1995 | event_thread = (struct thread_info *) |
fa96cb38 | 1996 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
1997 | if (event_thread != NULL) |
1998 | event_child = get_thread_lwp (event_thread); | |
1999 | if (debug_threads && event_thread) | |
2000 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2001 | } |
fa96cb38 | 2002 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2003 | { |
fa96cb38 | 2004 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2005 | |
bde24c0a | 2006 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2007 | && requested_child->status_pending_p |
2008 | && requested_child->collecting_fast_tracepoint) | |
2009 | { | |
2010 | enqueue_one_deferred_signal (requested_child, | |
2011 | &requested_child->status_pending); | |
2012 | requested_child->status_pending_p = 0; | |
2013 | requested_child->status_pending = 0; | |
2014 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2015 | } | |
2016 | ||
2017 | if (requested_child->suspended | |
2018 | && requested_child->status_pending_p) | |
38e08fca GB |
2019 | { |
2020 | internal_error (__FILE__, __LINE__, | |
2021 | "requesting an event out of a" | |
2022 | " suspended child?"); | |
2023 | } | |
fa593d66 | 2024 | |
d50171e4 | 2025 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2026 | { |
2027 | event_child = requested_child; | |
2028 | event_thread = get_lwp_thread (event_child); | |
2029 | } | |
0d62e5e8 | 2030 | } |
611cb4a5 | 2031 | |
0d62e5e8 DJ |
2032 | if (event_child != NULL) |
2033 | { | |
bd99dc85 | 2034 | if (debug_threads) |
87ce2a04 | 2035 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2036 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2037 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2038 | event_child->status_pending_p = 0; |
2039 | event_child->status_pending = 0; | |
0bfdf32f | 2040 | current_thread = event_thread; |
d86d4aaf | 2041 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2042 | } |
2043 | ||
fa96cb38 PA |
2044 | /* But if we don't find a pending event, we'll have to wait. |
2045 | ||
2046 | We only enter this loop if no process has a pending wait status. | |
2047 | Thus any action taken in response to a wait status inside this | |
2048 | loop is responding as soon as we detect the status, not after any | |
2049 | pending events. */ | |
d8301ad1 | 2050 | |
fa96cb38 PA |
2051 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2052 | all signals while here. */ | |
2053 | sigfillset (&block_mask); | |
2054 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2055 | ||
582511be PA |
2056 | /* Always pull all events out of the kernel. We'll randomly select |
2057 | an event LWP out of all that have events, to prevent | |
2058 | starvation. */ | |
fa96cb38 | 2059 | while (event_child == NULL) |
0d62e5e8 | 2060 | { |
fa96cb38 | 2061 | pid_t ret = 0; |
0d62e5e8 | 2062 | |
fa96cb38 PA |
2063 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2064 | quirks: | |
0d62e5e8 | 2065 | |
fa96cb38 PA |
2066 | - If the thread group leader exits while other threads in the |
2067 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2068 | waitpid won't return an exit status until the other threads | |
2069 | in the group are reaped. | |
611cb4a5 | 2070 | |
fa96cb38 PA |
2071 | - When a non-leader thread execs, that thread just vanishes |
2072 | without reporting an exit (so we'd hang if we waited for it | |
2073 | explicitly in that case). The exec event is reported to | |
2074 | the TGID pid (although we don't currently enable exec | |
2075 | events). */ | |
2076 | errno = 0; | |
2077 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2078 | |
fa96cb38 PA |
2079 | if (debug_threads) |
2080 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2081 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2082 | |
fa96cb38 | 2083 | if (ret > 0) |
0d62e5e8 | 2084 | { |
89be2091 | 2085 | if (debug_threads) |
bd99dc85 | 2086 | { |
fa96cb38 PA |
2087 | debug_printf ("LLW: waitpid %ld received %s\n", |
2088 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2089 | } |
89be2091 | 2090 | |
582511be PA |
2091 | /* Filter all events. IOW, leave all events pending. We'll |
2092 | randomly select an event LWP out of all that have events | |
2093 | below. */ | |
2094 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2095 | /* Retry until nothing comes out of waitpid. A single |
2096 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2097 | continue; |
2098 | } | |
2099 | ||
20ba1ce6 PA |
2100 | /* Now that we've pulled all events out of the kernel, resume |
2101 | LWPs that don't have an interesting event to report. */ | |
2102 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2103 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2104 | ||
2105 | /* ... and find an LWP with a status to report to the core, if | |
2106 | any. */ | |
582511be PA |
2107 | event_thread = (struct thread_info *) |
2108 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2109 | if (event_thread != NULL) | |
2110 | { | |
2111 | event_child = get_thread_lwp (event_thread); | |
2112 | *wstatp = event_child->status_pending; | |
2113 | event_child->status_pending_p = 0; | |
2114 | event_child->status_pending = 0; | |
2115 | break; | |
2116 | } | |
2117 | ||
fa96cb38 PA |
2118 | /* Check for zombie thread group leaders. Those can't be reaped |
2119 | until all other threads in the thread group are. */ | |
2120 | check_zombie_leaders (); | |
2121 | ||
2122 | /* If there are no resumed children left in the set of LWPs we | |
2123 | want to wait for, bail. We can't just block in | |
2124 | waitpid/sigsuspend, because lwps might have been left stopped | |
2125 | in trace-stop state, and we'd be stuck forever waiting for | |
2126 | their status to change (which would only happen if we resumed | |
2127 | them). Even if WNOHANG is set, this return code is preferred | |
2128 | over 0 (below), as it is more detailed. */ | |
2129 | if ((find_inferior (&all_threads, | |
2130 | not_stopped_callback, | |
2131 | &wait_ptid) == NULL)) | |
a6dbe5df | 2132 | { |
fa96cb38 PA |
2133 | if (debug_threads) |
2134 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2135 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2136 | return -1; | |
a6dbe5df PA |
2137 | } |
2138 | ||
fa96cb38 PA |
2139 | /* No interesting event to report to the caller. */ |
2140 | if ((options & WNOHANG)) | |
24a09b5f | 2141 | { |
fa96cb38 PA |
2142 | if (debug_threads) |
2143 | debug_printf ("WNOHANG set, no event found\n"); | |
2144 | ||
2145 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2146 | return 0; | |
24a09b5f DJ |
2147 | } |
2148 | ||
fa96cb38 PA |
2149 | /* Block until we get an event reported with SIGCHLD. */ |
2150 | if (debug_threads) | |
2151 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2152 | |
fa96cb38 PA |
2153 | sigsuspend (&prev_mask); |
2154 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2155 | goto retry; | |
2156 | } | |
d50171e4 | 2157 | |
fa96cb38 | 2158 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2159 | |
0bfdf32f | 2160 | current_thread = event_thread; |
d50171e4 | 2161 | |
fa96cb38 PA |
2162 | /* Check for thread exit. */ |
2163 | if (! WIFSTOPPED (*wstatp)) | |
2164 | { | |
2165 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2166 | ||
2167 | if (debug_threads) | |
2168 | debug_printf ("LWP %d is the last lwp of process. " | |
2169 | "Process %ld exiting.\n", | |
2170 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2171 | return lwpid_of (event_thread); |
611cb4a5 | 2172 | } |
0d62e5e8 | 2173 | |
fa96cb38 PA |
2174 | return lwpid_of (event_thread); |
2175 | } | |
2176 | ||
2177 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2178 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2179 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2180 | the stop status through the status pointer WSTAT. OPTIONS is | |
2181 | passed to the waitpid call. Return 0 if no event was found and | |
2182 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2183 | was found. Return the PID of the stopped child otherwise. */ | |
2184 | ||
2185 | static int | |
2186 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2187 | { | |
2188 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2189 | } |
2190 | ||
6bf5e0ba PA |
2191 | /* Count the LWP's that have had events. */ |
2192 | ||
2193 | static int | |
2194 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2195 | { | |
d86d4aaf | 2196 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2197 | int *count = data; |
2198 | ||
2199 | gdb_assert (count != NULL); | |
2200 | ||
582511be | 2201 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 PA |
2202 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2203 | && thread->last_resume_kind != resume_stop | |
582511be | 2204 | && thread->status_pending_p) |
6bf5e0ba PA |
2205 | (*count)++; |
2206 | ||
2207 | return 0; | |
2208 | } | |
2209 | ||
2210 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2211 | ||
2212 | static int | |
2213 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2214 | { | |
d86d4aaf DE |
2215 | struct thread_info *thread = (struct thread_info *) entry; |
2216 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2217 | |
8336d594 PA |
2218 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2219 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2220 | && lp->status_pending_p) |
2221 | return 1; | |
2222 | else | |
2223 | return 0; | |
2224 | } | |
2225 | ||
2226 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2227 | reported to GDB. */ | |
2228 | ||
2229 | static int | |
2230 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2231 | { | |
d86d4aaf | 2232 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2233 | int *selector = data; |
2234 | ||
2235 | gdb_assert (selector != NULL); | |
2236 | ||
582511be | 2237 | /* Select only resumed LWPs that have an event pending. */ |
8336d594 PA |
2238 | if (thread->last_resume_kind != resume_stop |
2239 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
582511be | 2240 | && thread->status_pending_p) |
6bf5e0ba PA |
2241 | if ((*selector)-- == 0) |
2242 | return 1; | |
2243 | ||
2244 | return 0; | |
2245 | } | |
2246 | ||
6bf5e0ba PA |
2247 | /* Select one LWP out of those that have events pending. */ |
2248 | ||
2249 | static void | |
2250 | select_event_lwp (struct lwp_info **orig_lp) | |
2251 | { | |
2252 | int num_events = 0; | |
2253 | int random_selector; | |
582511be PA |
2254 | struct thread_info *event_thread = NULL; |
2255 | ||
2256 | /* In all-stop, give preference to the LWP that is being | |
2257 | single-stepped. There will be at most one, and it's the LWP that | |
2258 | the core is most interested in. If we didn't do this, then we'd | |
2259 | have to handle pending step SIGTRAPs somehow in case the core | |
2260 | later continues the previously-stepped thread, otherwise we'd | |
2261 | report the pending SIGTRAP, and the core, not having stepped the | |
2262 | thread, wouldn't understand what the trap was for, and therefore | |
2263 | would report it to the user as a random signal. */ | |
2264 | if (!non_stop) | |
6bf5e0ba | 2265 | { |
582511be PA |
2266 | event_thread |
2267 | = (struct thread_info *) find_inferior (&all_threads, | |
2268 | select_singlestep_lwp_callback, | |
2269 | NULL); | |
2270 | if (event_thread != NULL) | |
2271 | { | |
2272 | if (debug_threads) | |
2273 | debug_printf ("SEL: Select single-step %s\n", | |
2274 | target_pid_to_str (ptid_of (event_thread))); | |
2275 | } | |
6bf5e0ba | 2276 | } |
582511be | 2277 | if (event_thread == NULL) |
6bf5e0ba PA |
2278 | { |
2279 | /* No single-stepping LWP. Select one at random, out of those | |
2280 | which have had SIGTRAP events. */ | |
2281 | ||
2282 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2283 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2284 | |
2285 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2286 | random_selector = (int) | |
2287 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2288 | ||
2289 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2290 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2291 | num_events, random_selector); | |
6bf5e0ba | 2292 | |
d86d4aaf DE |
2293 | event_thread |
2294 | = (struct thread_info *) find_inferior (&all_threads, | |
2295 | select_event_lwp_callback, | |
2296 | &random_selector); | |
6bf5e0ba PA |
2297 | } |
2298 | ||
d86d4aaf | 2299 | if (event_thread != NULL) |
6bf5e0ba | 2300 | { |
d86d4aaf DE |
2301 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2302 | ||
6bf5e0ba PA |
2303 | /* Switch the event LWP. */ |
2304 | *orig_lp = event_lp; | |
2305 | } | |
2306 | } | |
2307 | ||
7984d532 PA |
2308 | /* Decrement the suspend count of an LWP. */ |
2309 | ||
2310 | static int | |
2311 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2312 | { | |
d86d4aaf DE |
2313 | struct thread_info *thread = (struct thread_info *) entry; |
2314 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2315 | |
2316 | /* Ignore EXCEPT. */ | |
2317 | if (lwp == except) | |
2318 | return 0; | |
2319 | ||
2320 | lwp->suspended--; | |
2321 | ||
2322 | gdb_assert (lwp->suspended >= 0); | |
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2327 | NULL. */ | |
2328 | ||
2329 | static void | |
2330 | unsuspend_all_lwps (struct lwp_info *except) | |
2331 | { | |
d86d4aaf | 2332 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2333 | } |
2334 | ||
fa593d66 PA |
2335 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2336 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2337 | void *data); | |
2338 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2339 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2340 | struct target_waitstatus *ourstatus, | |
2341 | int target_options); | |
2342 | ||
2343 | /* Stabilize threads (move out of jump pads). | |
2344 | ||
2345 | If a thread is midway collecting a fast tracepoint, we need to | |
2346 | finish the collection and move it out of the jump pad before | |
2347 | reporting the signal. | |
2348 | ||
2349 | This avoids recursion while collecting (when a signal arrives | |
2350 | midway, and the signal handler itself collects), which would trash | |
2351 | the trace buffer. In case the user set a breakpoint in a signal | |
2352 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2353 | Most importantly, there are certain things we can't do safely if | |
2354 | threads are stopped in a jump pad (or in its callee's). For | |
2355 | example: | |
2356 | ||
2357 | - starting a new trace run. A thread still collecting the | |
2358 | previous run, could trash the trace buffer when resumed. The trace | |
2359 | buffer control structures would have been reset but the thread had | |
2360 | no way to tell. The thread could even midway memcpy'ing to the | |
2361 | buffer, which would mean that when resumed, it would clobber the | |
2362 | trace buffer that had been set for a new run. | |
2363 | ||
2364 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2365 | safely. Say you do tstart while a thread is stopped midway while | |
2366 | collecting. When the thread is later resumed, it finishes the | |
2367 | collection, and returns to the jump pad, to execute the original | |
2368 | instruction that was under the tracepoint jump at the time the | |
2369 | older run had been started. If the jump pad had been rewritten | |
2370 | since for something else in the new run, the thread would now | |
2371 | execute the wrong / random instructions. */ | |
2372 | ||
2373 | static void | |
2374 | linux_stabilize_threads (void) | |
2375 | { | |
0bfdf32f | 2376 | struct thread_info *saved_thread; |
d86d4aaf | 2377 | struct thread_info *thread_stuck; |
fa593d66 | 2378 | |
d86d4aaf DE |
2379 | thread_stuck |
2380 | = (struct thread_info *) find_inferior (&all_threads, | |
2381 | stuck_in_jump_pad_callback, | |
2382 | NULL); | |
2383 | if (thread_stuck != NULL) | |
fa593d66 | 2384 | { |
b4d51a55 | 2385 | if (debug_threads) |
87ce2a04 | 2386 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2387 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2388 | return; |
2389 | } | |
2390 | ||
0bfdf32f | 2391 | saved_thread = current_thread; |
fa593d66 PA |
2392 | |
2393 | stabilizing_threads = 1; | |
2394 | ||
2395 | /* Kick 'em all. */ | |
d86d4aaf | 2396 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2397 | |
2398 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2399 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2400 | { |
2401 | struct target_waitstatus ourstatus; | |
2402 | struct lwp_info *lwp; | |
fa593d66 PA |
2403 | int wstat; |
2404 | ||
2405 | /* Note that we go through the full wait even loop. While | |
2406 | moving threads out of jump pad, we need to be able to step | |
2407 | over internal breakpoints and such. */ | |
32fcada3 | 2408 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2409 | |
2410 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2411 | { | |
0bfdf32f | 2412 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2413 | |
2414 | /* Lock it. */ | |
2415 | lwp->suspended++; | |
2416 | ||
a493e3e2 | 2417 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2418 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2419 | { |
2ea28649 | 2420 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2421 | enqueue_one_deferred_signal (lwp, &wstat); |
2422 | } | |
2423 | } | |
2424 | } | |
2425 | ||
d86d4aaf | 2426 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2427 | |
2428 | stabilizing_threads = 0; | |
2429 | ||
0bfdf32f | 2430 | current_thread = saved_thread; |
fa593d66 | 2431 | |
b4d51a55 | 2432 | if (debug_threads) |
fa593d66 | 2433 | { |
d86d4aaf DE |
2434 | thread_stuck |
2435 | = (struct thread_info *) find_inferior (&all_threads, | |
2436 | stuck_in_jump_pad_callback, | |
2437 | NULL); | |
2438 | if (thread_stuck != NULL) | |
87ce2a04 | 2439 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2440 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2441 | } |
2442 | } | |
2443 | ||
582511be PA |
2444 | static void async_file_mark (void); |
2445 | ||
2446 | /* Convenience function that is called when the kernel reports an | |
2447 | event that is not passed out to GDB. */ | |
2448 | ||
2449 | static ptid_t | |
2450 | ignore_event (struct target_waitstatus *ourstatus) | |
2451 | { | |
2452 | /* If we got an event, there may still be others, as a single | |
2453 | SIGCHLD can indicate more than one child stopped. This forces | |
2454 | another target_wait call. */ | |
2455 | async_file_mark (); | |
2456 | ||
2457 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2458 | return null_ptid; | |
2459 | } | |
2460 | ||
0d62e5e8 | 2461 | /* Wait for process, returns status. */ |
da6d8c04 | 2462 | |
95954743 PA |
2463 | static ptid_t |
2464 | linux_wait_1 (ptid_t ptid, | |
2465 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2466 | { |
e5f1222d | 2467 | int w; |
fc7238bb | 2468 | struct lwp_info *event_child; |
bd99dc85 | 2469 | int options; |
bd99dc85 | 2470 | int pid; |
6bf5e0ba PA |
2471 | int step_over_finished; |
2472 | int bp_explains_trap; | |
2473 | int maybe_internal_trap; | |
2474 | int report_to_gdb; | |
219f2f23 | 2475 | int trace_event; |
c2d6af84 | 2476 | int in_step_range; |
bd99dc85 | 2477 | |
87ce2a04 DE |
2478 | if (debug_threads) |
2479 | { | |
2480 | debug_enter (); | |
2481 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2482 | } | |
2483 | ||
bd99dc85 PA |
2484 | /* Translate generic target options into linux options. */ |
2485 | options = __WALL; | |
2486 | if (target_options & TARGET_WNOHANG) | |
2487 | options |= WNOHANG; | |
0d62e5e8 | 2488 | |
fa593d66 PA |
2489 | bp_explains_trap = 0; |
2490 | trace_event = 0; | |
c2d6af84 | 2491 | in_step_range = 0; |
bd99dc85 PA |
2492 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2493 | ||
6bf5e0ba PA |
2494 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2495 | pid = linux_wait_for_event (ptid, &w, options); | |
2496 | else | |
2497 | { | |
2498 | if (debug_threads) | |
87ce2a04 DE |
2499 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2500 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2501 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2502 | } | |
2503 | ||
fa96cb38 | 2504 | if (pid == 0) |
87ce2a04 | 2505 | { |
fa96cb38 PA |
2506 | gdb_assert (target_options & TARGET_WNOHANG); |
2507 | ||
87ce2a04 DE |
2508 | if (debug_threads) |
2509 | { | |
fa96cb38 PA |
2510 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2511 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2512 | debug_exit (); |
2513 | } | |
fa96cb38 PA |
2514 | |
2515 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2516 | return null_ptid; |
2517 | } | |
fa96cb38 PA |
2518 | else if (pid == -1) |
2519 | { | |
2520 | if (debug_threads) | |
2521 | { | |
2522 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2523 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2524 | debug_exit (); | |
2525 | } | |
bd99dc85 | 2526 | |
fa96cb38 PA |
2527 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2528 | return null_ptid; | |
2529 | } | |
0d62e5e8 | 2530 | |
0bfdf32f | 2531 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2532 | |
fa96cb38 PA |
2533 | /* linux_wait_for_event only returns an exit status for the last |
2534 | child of a process. Report it. */ | |
2535 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2536 | { |
fa96cb38 | 2537 | if (WIFEXITED (w)) |
0d62e5e8 | 2538 | { |
fa96cb38 PA |
2539 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2540 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2541 | |
fa96cb38 | 2542 | if (debug_threads) |
bd99dc85 | 2543 | { |
fa96cb38 PA |
2544 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2545 | "retcode %d\n", | |
0bfdf32f | 2546 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2547 | WEXITSTATUS (w)); |
2548 | debug_exit (); | |
bd99dc85 | 2549 | } |
fa96cb38 PA |
2550 | } |
2551 | else | |
2552 | { | |
2553 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2554 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2555 | |
fa96cb38 PA |
2556 | if (debug_threads) |
2557 | { | |
2558 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2559 | "signal %d\n", | |
0bfdf32f | 2560 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2561 | WTERMSIG (w)); |
2562 | debug_exit (); | |
2563 | } | |
0d62e5e8 | 2564 | } |
fa96cb38 | 2565 | |
0bfdf32f | 2566 | return ptid_of (current_thread); |
da6d8c04 DJ |
2567 | } |
2568 | ||
6bf5e0ba PA |
2569 | /* If this event was not handled before, and is not a SIGTRAP, we |
2570 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2571 | a breakpoint is inserted at the current PC. If this target does | |
2572 | not support internal breakpoints at all, we also report the | |
2573 | SIGTRAP without further processing; it's of no concern to us. */ | |
2574 | maybe_internal_trap | |
2575 | = (supports_breakpoints () | |
2576 | && (WSTOPSIG (w) == SIGTRAP | |
2577 | || ((WSTOPSIG (w) == SIGILL | |
2578 | || WSTOPSIG (w) == SIGSEGV) | |
2579 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2580 | ||
2581 | if (maybe_internal_trap) | |
2582 | { | |
2583 | /* Handle anything that requires bookkeeping before deciding to | |
2584 | report the event or continue waiting. */ | |
2585 | ||
2586 | /* First check if we can explain the SIGTRAP with an internal | |
2587 | breakpoint, or if we should possibly report the event to GDB. | |
2588 | Do this before anything that may remove or insert a | |
2589 | breakpoint. */ | |
2590 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2591 | ||
2592 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2593 | finished. If so, tweak the state machine accordingly, | |
2594 | reinsert breakpoints and delete any reinsert (software | |
2595 | single-step) breakpoints. */ | |
2596 | step_over_finished = finish_step_over (event_child); | |
2597 | ||
2598 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2599 | check_breakpoints (event_child->stop_pc); | |
2600 | ||
219f2f23 PA |
2601 | /* Handle tracepoint data collecting. This may overflow the |
2602 | trace buffer, and cause a tracing stop, removing | |
2603 | breakpoints. */ | |
2604 | trace_event = handle_tracepoints (event_child); | |
2605 | ||
6bf5e0ba PA |
2606 | if (bp_explains_trap) |
2607 | { | |
2608 | /* If we stepped or ran into an internal breakpoint, we've | |
2609 | already handled it. So next time we resume (from this | |
2610 | PC), we should step over it. */ | |
2611 | if (debug_threads) | |
87ce2a04 | 2612 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2613 | |
8b07ae33 PA |
2614 | if (breakpoint_here (event_child->stop_pc)) |
2615 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2616 | } |
2617 | } | |
2618 | else | |
2619 | { | |
2620 | /* We have some other signal, possibly a step-over dance was in | |
2621 | progress, and it should be cancelled too. */ | |
2622 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2623 | } |
2624 | ||
2625 | /* We have all the data we need. Either report the event to GDB, or | |
2626 | resume threads and keep waiting for more. */ | |
2627 | ||
2628 | /* If we're collecting a fast tracepoint, finish the collection and | |
2629 | move out of the jump pad before delivering a signal. See | |
2630 | linux_stabilize_threads. */ | |
2631 | ||
2632 | if (WIFSTOPPED (w) | |
2633 | && WSTOPSIG (w) != SIGTRAP | |
2634 | && supports_fast_tracepoints () | |
58b4daa5 | 2635 | && agent_loaded_p ()) |
fa593d66 PA |
2636 | { |
2637 | if (debug_threads) | |
87ce2a04 DE |
2638 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2639 | "to defer or adjust it.\n", | |
0bfdf32f | 2640 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2641 | |
2642 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2643 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2644 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2645 | { | |
2646 | enqueue_one_deferred_signal (event_child, &w); | |
2647 | ||
2648 | if (debug_threads) | |
87ce2a04 | 2649 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2650 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2651 | |
2652 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2653 | |
2654 | return ignore_event (ourstatus); | |
fa593d66 PA |
2655 | } |
2656 | } | |
219f2f23 | 2657 | |
fa593d66 PA |
2658 | if (event_child->collecting_fast_tracepoint) |
2659 | { | |
2660 | if (debug_threads) | |
87ce2a04 DE |
2661 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2662 | "Check if we're already there.\n", | |
0bfdf32f | 2663 | lwpid_of (current_thread), |
87ce2a04 | 2664 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2665 | |
2666 | trace_event = 1; | |
2667 | ||
2668 | event_child->collecting_fast_tracepoint | |
2669 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2670 | ||
2671 | if (event_child->collecting_fast_tracepoint != 1) | |
2672 | { | |
2673 | /* No longer need this breakpoint. */ | |
2674 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2675 | { | |
2676 | if (debug_threads) | |
87ce2a04 DE |
2677 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2678 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2679 | |
2680 | /* Other running threads could hit this breakpoint. | |
2681 | We don't handle moribund locations like GDB does, | |
2682 | instead we always pause all threads when removing | |
2683 | breakpoints, so that any step-over or | |
2684 | decr_pc_after_break adjustment is always taken | |
2685 | care of while the breakpoint is still | |
2686 | inserted. */ | |
2687 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
2688 | |
2689 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2690 | event_child->exit_jump_pad_bkpt = NULL; | |
2691 | ||
2692 | unstop_all_lwps (1, event_child); | |
2693 | ||
2694 | gdb_assert (event_child->suspended >= 0); | |
2695 | } | |
2696 | } | |
2697 | ||
2698 | if (event_child->collecting_fast_tracepoint == 0) | |
2699 | { | |
2700 | if (debug_threads) | |
87ce2a04 DE |
2701 | debug_printf ("fast tracepoint finished " |
2702 | "collecting successfully.\n"); | |
fa593d66 PA |
2703 | |
2704 | /* We may have a deferred signal to report. */ | |
2705 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2706 | { | |
2707 | if (debug_threads) | |
87ce2a04 | 2708 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2709 | } |
3c11dd79 | 2710 | else |
fa593d66 | 2711 | { |
3c11dd79 | 2712 | if (debug_threads) |
87ce2a04 | 2713 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2714 | |
2715 | if (stabilizing_threads) | |
2716 | { | |
2717 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2718 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2719 | |
2720 | if (debug_threads) | |
2721 | { | |
2722 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2723 | "while stabilizing threads\n", | |
0bfdf32f | 2724 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
2725 | debug_exit (); |
2726 | } | |
2727 | ||
0bfdf32f | 2728 | return ptid_of (current_thread); |
fa593d66 PA |
2729 | } |
2730 | } | |
2731 | } | |
6bf5e0ba PA |
2732 | } |
2733 | ||
e471f25b PA |
2734 | /* Check whether GDB would be interested in this event. */ |
2735 | ||
2736 | /* If GDB is not interested in this signal, don't stop other | |
2737 | threads, and don't report it to GDB. Just resume the inferior | |
2738 | right away. We do this for threading-related signals as well as | |
2739 | any that GDB specifically requested we ignore. But never ignore | |
2740 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2741 | stepping - they may require special handling to skip the signal | |
2742 | handler. */ | |
2743 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2744 | thread library? */ | |
2745 | if (WIFSTOPPED (w) | |
0bfdf32f | 2746 | && current_thread->last_resume_kind != resume_step |
e471f25b | 2747 | && ( |
1a981360 | 2748 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2749 | (current_process ()->private->thread_db != NULL |
2750 | && (WSTOPSIG (w) == __SIGRTMIN | |
2751 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2752 | || | |
2753 | #endif | |
2ea28649 | 2754 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 2755 | && !(WSTOPSIG (w) == SIGSTOP |
0bfdf32f | 2756 | && current_thread->last_resume_kind == resume_stop)))) |
e471f25b PA |
2757 | { |
2758 | siginfo_t info, *info_p; | |
2759 | ||
2760 | if (debug_threads) | |
87ce2a04 | 2761 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 2762 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 2763 | |
0bfdf32f | 2764 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2765 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2766 | info_p = &info; |
2767 | else | |
2768 | info_p = NULL; | |
2769 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2770 | WSTOPSIG (w), info_p); | |
582511be | 2771 | return ignore_event (ourstatus); |
e471f25b PA |
2772 | } |
2773 | ||
c2d6af84 PA |
2774 | /* Note that all addresses are always "out of the step range" when |
2775 | there's no range to begin with. */ | |
2776 | in_step_range = lwp_in_step_range (event_child); | |
2777 | ||
2778 | /* If GDB wanted this thread to single step, and the thread is out | |
2779 | of the step range, we always want to report the SIGTRAP, and let | |
2780 | GDB handle it. Watchpoints should always be reported. So should | |
2781 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2782 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2783 | do, we're be able to handle GDB breakpoints on top of internal | |
2784 | breakpoints, by handling the internal breakpoint and still | |
2785 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2786 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2787 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 2788 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 2789 | && !in_step_range) |
582511be | 2790 | || event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
c2d6af84 | 2791 | || (!step_over_finished && !in_step_range |
493e2a69 | 2792 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2793 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2794 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2795 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2796 | ||
2797 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2798 | |
2799 | /* We found no reason GDB would want us to stop. We either hit one | |
2800 | of our own breakpoints, or finished an internal step GDB | |
2801 | shouldn't know about. */ | |
2802 | if (!report_to_gdb) | |
2803 | { | |
2804 | if (debug_threads) | |
2805 | { | |
2806 | if (bp_explains_trap) | |
87ce2a04 | 2807 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2808 | if (step_over_finished) |
87ce2a04 | 2809 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2810 | if (trace_event) |
87ce2a04 | 2811 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2812 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2813 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2814 | paddress (event_child->stop_pc), | |
2815 | paddress (event_child->step_range_start), | |
2816 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2817 | } |
2818 | ||
2819 | /* We're not reporting this breakpoint to GDB, so apply the | |
2820 | decr_pc_after_break adjustment to the inferior's regcache | |
2821 | ourselves. */ | |
2822 | ||
2823 | if (the_low_target.set_pc != NULL) | |
2824 | { | |
2825 | struct regcache *regcache | |
0bfdf32f | 2826 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
2827 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2828 | } | |
2829 | ||
7984d532 PA |
2830 | /* We may have finished stepping over a breakpoint. If so, |
2831 | we've stopped and suspended all LWPs momentarily except the | |
2832 | stepping one. This is where we resume them all again. We're | |
2833 | going to keep waiting, so use proceed, which handles stepping | |
2834 | over the next breakpoint. */ | |
6bf5e0ba | 2835 | if (debug_threads) |
87ce2a04 | 2836 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2837 | |
2838 | if (step_over_finished) | |
2839 | unsuspend_all_lwps (event_child); | |
2840 | ||
6bf5e0ba | 2841 | proceed_all_lwps (); |
582511be | 2842 | return ignore_event (ourstatus); |
6bf5e0ba PA |
2843 | } |
2844 | ||
2845 | if (debug_threads) | |
2846 | { | |
0bfdf32f | 2847 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
2848 | { |
2849 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2850 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2851 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2852 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2853 | } |
582511be | 2854 | if (event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 2855 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 2856 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2857 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2858 | if (debug_threads) |
87ce2a04 | 2859 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2860 | } |
2861 | ||
2862 | /* Alright, we're going to report a stop. */ | |
2863 | ||
582511be | 2864 | if (!stabilizing_threads) |
6bf5e0ba PA |
2865 | { |
2866 | /* In all-stop, stop all threads. */ | |
582511be PA |
2867 | if (!non_stop) |
2868 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
2869 | |
2870 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2871 | from among those that have had events. Giving equal priority | |
2872 | to all LWPs that have had events helps prevent | |
2873 | starvation. */ | |
2874 | if (ptid_equal (ptid, minus_one_ptid)) | |
2875 | { | |
2876 | event_child->status_pending_p = 1; | |
2877 | event_child->status_pending = w; | |
2878 | ||
2879 | select_event_lwp (&event_child); | |
2880 | ||
0bfdf32f GB |
2881 | /* current_thread and event_child must stay in sync. */ |
2882 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 2883 | |
6bf5e0ba PA |
2884 | event_child->status_pending_p = 0; |
2885 | w = event_child->status_pending; | |
2886 | } | |
2887 | ||
c03e6ccc | 2888 | if (step_over_finished) |
582511be PA |
2889 | { |
2890 | if (!non_stop) | |
2891 | { | |
2892 | /* If we were doing a step-over, all other threads but | |
2893 | the stepping one had been paused in start_step_over, | |
2894 | with their suspend counts incremented. We don't want | |
2895 | to do a full unstop/unpause, because we're in | |
2896 | all-stop mode (so we want threads stopped), but we | |
2897 | still need to unsuspend the other threads, to | |
2898 | decrement their `suspended' count back. */ | |
2899 | unsuspend_all_lwps (event_child); | |
2900 | } | |
2901 | else | |
2902 | { | |
2903 | /* If we just finished a step-over, then all threads had | |
2904 | been momentarily paused. In all-stop, that's fine, | |
2905 | we want threads stopped by now anyway. In non-stop, | |
2906 | we need to re-resume threads that GDB wanted to be | |
2907 | running. */ | |
2908 | unstop_all_lwps (1, event_child); | |
2909 | } | |
2910 | } | |
c03e6ccc | 2911 | |
fa593d66 | 2912 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
2913 | if (!non_stop) |
2914 | stabilize_threads (); | |
6bf5e0ba PA |
2915 | } |
2916 | else | |
2917 | { | |
2918 | /* If we just finished a step-over, then all threads had been | |
2919 | momentarily paused. In all-stop, that's fine, we want | |
2920 | threads stopped by now anyway. In non-stop, we need to | |
2921 | re-resume threads that GDB wanted to be running. */ | |
2922 | if (step_over_finished) | |
7984d532 | 2923 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2924 | } |
2925 | ||
5b1c542e | 2926 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2927 | |
582511be PA |
2928 | /* Now that we've selected our final event LWP, un-adjust its PC if |
2929 | it was a software breakpoint. */ | |
2930 | if (event_child->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT) | |
2931 | { | |
2932 | int decr_pc = the_low_target.decr_pc_after_break; | |
2933 | ||
2934 | if (decr_pc != 0) | |
2935 | { | |
2936 | struct regcache *regcache | |
2937 | = get_thread_regcache (current_thread, 1); | |
2938 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
2939 | } | |
2940 | } | |
2941 | ||
0bfdf32f | 2942 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2943 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
2944 | { |
2945 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2946 | and it stopped cleanly, so report as SIG0. The use of | |
2947 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2948 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2949 | } |
0bfdf32f | 2950 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2951 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
2952 | { |
2953 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2954 | but, it stopped for other reasons. */ |
2ea28649 | 2955 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2956 | } |
2957 | else | |
2958 | { | |
2ea28649 | 2959 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2960 | } |
2961 | ||
d50171e4 PA |
2962 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2963 | ||
bd99dc85 | 2964 | if (debug_threads) |
87ce2a04 DE |
2965 | { |
2966 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 2967 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
2968 | ourstatus->kind, ourstatus->value.sig); |
2969 | debug_exit (); | |
2970 | } | |
bd99dc85 | 2971 | |
0bfdf32f | 2972 | return ptid_of (current_thread); |
bd99dc85 PA |
2973 | } |
2974 | ||
2975 | /* Get rid of any pending event in the pipe. */ | |
2976 | static void | |
2977 | async_file_flush (void) | |
2978 | { | |
2979 | int ret; | |
2980 | char buf; | |
2981 | ||
2982 | do | |
2983 | ret = read (linux_event_pipe[0], &buf, 1); | |
2984 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2985 | } | |
2986 | ||
2987 | /* Put something in the pipe, so the event loop wakes up. */ | |
2988 | static void | |
2989 | async_file_mark (void) | |
2990 | { | |
2991 | int ret; | |
2992 | ||
2993 | async_file_flush (); | |
2994 | ||
2995 | do | |
2996 | ret = write (linux_event_pipe[1], "+", 1); | |
2997 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2998 | ||
2999 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3000 | be awakened anyway. */ | |
3001 | } | |
3002 | ||
95954743 PA |
3003 | static ptid_t |
3004 | linux_wait (ptid_t ptid, | |
3005 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3006 | { |
95954743 | 3007 | ptid_t event_ptid; |
bd99dc85 | 3008 | |
bd99dc85 PA |
3009 | /* Flush the async file first. */ |
3010 | if (target_is_async_p ()) | |
3011 | async_file_flush (); | |
3012 | ||
582511be PA |
3013 | do |
3014 | { | |
3015 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3016 | } | |
3017 | while ((target_options & TARGET_WNOHANG) == 0 | |
3018 | && ptid_equal (event_ptid, null_ptid) | |
3019 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3020 | |
3021 | /* If at least one stop was reported, there may be more. A single | |
3022 | SIGCHLD can signal more than one child stop. */ | |
3023 | if (target_is_async_p () | |
3024 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3025 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3026 | async_file_mark (); |
3027 | ||
3028 | return event_ptid; | |
da6d8c04 DJ |
3029 | } |
3030 | ||
c5f62d5f | 3031 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3032 | |
3033 | static int | |
a1928bad | 3034 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3035 | { |
c5f62d5f DE |
3036 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3037 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3038 | |
c5f62d5f DE |
3039 | #ifdef __NR_tkill |
3040 | { | |
3041 | static int tkill_failed; | |
fd500816 | 3042 | |
c5f62d5f DE |
3043 | if (!tkill_failed) |
3044 | { | |
3045 | int ret; | |
3046 | ||
3047 | errno = 0; | |
3048 | ret = syscall (__NR_tkill, lwpid, signo); | |
3049 | if (errno != ENOSYS) | |
3050 | return ret; | |
3051 | tkill_failed = 1; | |
3052 | } | |
3053 | } | |
fd500816 DJ |
3054 | #endif |
3055 | ||
3056 | return kill (lwpid, signo); | |
3057 | } | |
3058 | ||
964e4306 PA |
3059 | void |
3060 | linux_stop_lwp (struct lwp_info *lwp) | |
3061 | { | |
3062 | send_sigstop (lwp); | |
3063 | } | |
3064 | ||
0d62e5e8 | 3065 | static void |
02fc4de7 | 3066 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3067 | { |
bd99dc85 | 3068 | int pid; |
0d62e5e8 | 3069 | |
d86d4aaf | 3070 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3071 | |
0d62e5e8 DJ |
3072 | /* If we already have a pending stop signal for this process, don't |
3073 | send another. */ | |
54a0b537 | 3074 | if (lwp->stop_expected) |
0d62e5e8 | 3075 | { |
ae13219e | 3076 | if (debug_threads) |
87ce2a04 | 3077 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3078 | |
0d62e5e8 DJ |
3079 | return; |
3080 | } | |
3081 | ||
3082 | if (debug_threads) | |
87ce2a04 | 3083 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3084 | |
d50171e4 | 3085 | lwp->stop_expected = 1; |
bd99dc85 | 3086 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3087 | } |
3088 | ||
7984d532 PA |
3089 | static int |
3090 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3091 | { |
d86d4aaf DE |
3092 | struct thread_info *thread = (struct thread_info *) entry; |
3093 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3094 | |
7984d532 PA |
3095 | /* Ignore EXCEPT. */ |
3096 | if (lwp == except) | |
3097 | return 0; | |
3098 | ||
02fc4de7 | 3099 | if (lwp->stopped) |
7984d532 | 3100 | return 0; |
02fc4de7 PA |
3101 | |
3102 | send_sigstop (lwp); | |
7984d532 PA |
3103 | return 0; |
3104 | } | |
3105 | ||
3106 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3107 | yet. */ | |
3108 | static int | |
3109 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3110 | void *except) | |
3111 | { | |
d86d4aaf DE |
3112 | struct thread_info *thread = (struct thread_info *) entry; |
3113 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3114 | |
3115 | /* Ignore EXCEPT. */ | |
3116 | if (lwp == except) | |
3117 | return 0; | |
3118 | ||
3119 | lwp->suspended++; | |
3120 | ||
3121 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3122 | } |
3123 | ||
95954743 PA |
3124 | static void |
3125 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3126 | { | |
3127 | /* It's dead, really. */ | |
3128 | lwp->dead = 1; | |
3129 | ||
3130 | /* Store the exit status for later. */ | |
3131 | lwp->status_pending_p = 1; | |
3132 | lwp->status_pending = wstat; | |
3133 | ||
95954743 PA |
3134 | /* Prevent trying to stop it. */ |
3135 | lwp->stopped = 1; | |
3136 | ||
3137 | /* No further stops are expected from a dead lwp. */ | |
3138 | lwp->stop_expected = 0; | |
3139 | } | |
3140 | ||
fa96cb38 PA |
3141 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3142 | ||
0d62e5e8 | 3143 | static void |
fa96cb38 | 3144 | wait_for_sigstop (void) |
0d62e5e8 | 3145 | { |
0bfdf32f | 3146 | struct thread_info *saved_thread; |
95954743 | 3147 | ptid_t saved_tid; |
fa96cb38 PA |
3148 | int wstat; |
3149 | int ret; | |
0d62e5e8 | 3150 | |
0bfdf32f GB |
3151 | saved_thread = current_thread; |
3152 | if (saved_thread != NULL) | |
3153 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3154 | else |
95954743 | 3155 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3156 | |
d50171e4 | 3157 | if (debug_threads) |
fa96cb38 | 3158 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3159 | |
fa96cb38 PA |
3160 | /* Passing NULL_PTID as filter indicates we want all events to be |
3161 | left pending. Eventually this returns when there are no | |
3162 | unwaited-for children left. */ | |
3163 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3164 | &wstat, __WALL); | |
3165 | gdb_assert (ret == -1); | |
0d62e5e8 | 3166 | |
0bfdf32f GB |
3167 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3168 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3169 | else |
3170 | { | |
3171 | if (debug_threads) | |
87ce2a04 | 3172 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3173 | |
bd99dc85 PA |
3174 | if (non_stop) |
3175 | { | |
3176 | /* We can't change the current inferior behind GDB's back, | |
3177 | otherwise, a subsequent command may apply to the wrong | |
3178 | process. */ | |
0bfdf32f | 3179 | current_thread = NULL; |
bd99dc85 PA |
3180 | } |
3181 | else | |
3182 | { | |
3183 | /* Set a valid thread as current. */ | |
0bfdf32f | 3184 | set_desired_thread (0); |
bd99dc85 | 3185 | } |
0d62e5e8 DJ |
3186 | } |
3187 | } | |
3188 | ||
fa593d66 PA |
3189 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3190 | move it out, because we need to report the stop event to GDB. For | |
3191 | example, if the user puts a breakpoint in the jump pad, it's | |
3192 | because she wants to debug it. */ | |
3193 | ||
3194 | static int | |
3195 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3196 | { | |
d86d4aaf DE |
3197 | struct thread_info *thread = (struct thread_info *) entry; |
3198 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3199 | |
3200 | gdb_assert (lwp->suspended == 0); | |
3201 | gdb_assert (lwp->stopped); | |
3202 | ||
3203 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3204 | return (supports_fast_tracepoints () | |
58b4daa5 | 3205 | && agent_loaded_p () |
fa593d66 | 3206 | && (gdb_breakpoint_here (lwp->stop_pc) |
582511be | 3207 | || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3208 | || thread->last_resume_kind == resume_step) |
3209 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3210 | } | |
3211 | ||
3212 | static void | |
3213 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3214 | { | |
d86d4aaf DE |
3215 | struct thread_info *thread = (struct thread_info *) entry; |
3216 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3217 | int *wstat; |
3218 | ||
3219 | gdb_assert (lwp->suspended == 0); | |
3220 | gdb_assert (lwp->stopped); | |
3221 | ||
3222 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3223 | ||
3224 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3225 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
582511be | 3226 | && lwp->stop_reason != LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3227 | && thread->last_resume_kind != resume_step |
3228 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3229 | { | |
3230 | if (debug_threads) | |
87ce2a04 | 3231 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3232 | lwpid_of (thread)); |
fa593d66 PA |
3233 | |
3234 | if (wstat) | |
3235 | { | |
3236 | lwp->status_pending_p = 0; | |
3237 | enqueue_one_deferred_signal (lwp, wstat); | |
3238 | ||
3239 | if (debug_threads) | |
87ce2a04 DE |
3240 | debug_printf ("Signal %d for LWP %ld deferred " |
3241 | "(in jump pad)\n", | |
d86d4aaf | 3242 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3243 | } |
3244 | ||
3245 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3246 | } | |
3247 | else | |
3248 | lwp->suspended++; | |
3249 | } | |
3250 | ||
3251 | static int | |
3252 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3253 | { | |
d86d4aaf DE |
3254 | struct thread_info *thread = (struct thread_info *) entry; |
3255 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3256 | |
3257 | if (lwp->dead) | |
3258 | return 0; | |
3259 | if (lwp->stopped) | |
3260 | return 0; | |
3261 | return 1; | |
3262 | } | |
3263 | ||
7984d532 PA |
3264 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3265 | If SUSPEND, then also increase the suspend count of every LWP, | |
3266 | except EXCEPT. */ | |
3267 | ||
0d62e5e8 | 3268 | static void |
7984d532 | 3269 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3270 | { |
bde24c0a PA |
3271 | /* Should not be called recursively. */ |
3272 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3273 | ||
87ce2a04 DE |
3274 | if (debug_threads) |
3275 | { | |
3276 | debug_enter (); | |
3277 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3278 | suspend ? "stop-and-suspend" : "stop", | |
3279 | except != NULL | |
d86d4aaf | 3280 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3281 | : "none"); |
3282 | } | |
3283 | ||
bde24c0a PA |
3284 | stopping_threads = (suspend |
3285 | ? STOPPING_AND_SUSPENDING_THREADS | |
3286 | : STOPPING_THREADS); | |
7984d532 PA |
3287 | |
3288 | if (suspend) | |
d86d4aaf | 3289 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3290 | else |
d86d4aaf | 3291 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3292 | wait_for_sigstop (); |
bde24c0a | 3293 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3294 | |
3295 | if (debug_threads) | |
3296 | { | |
3297 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3298 | "back to !stopping\n"); | |
3299 | debug_exit (); | |
3300 | } | |
0d62e5e8 DJ |
3301 | } |
3302 | ||
da6d8c04 DJ |
3303 | /* Resume execution of the inferior process. |
3304 | If STEP is nonzero, single-step it. | |
3305 | If SIGNAL is nonzero, give it that signal. */ | |
3306 | ||
ce3a066d | 3307 | static void |
2acc282a | 3308 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3309 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3310 | { |
d86d4aaf | 3311 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3312 | struct thread_info *saved_thread; |
fa593d66 | 3313 | int fast_tp_collecting; |
0d62e5e8 | 3314 | |
54a0b537 | 3315 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3316 | return; |
3317 | ||
fa593d66 PA |
3318 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3319 | ||
3320 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3321 | ||
219f2f23 PA |
3322 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3323 | user used the "jump" command, or "set $pc = foo"). */ | |
3324 | if (lwp->stop_pc != get_pc (lwp)) | |
3325 | { | |
3326 | /* Collecting 'while-stepping' actions doesn't make sense | |
3327 | anymore. */ | |
d86d4aaf | 3328 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3329 | } |
3330 | ||
0d62e5e8 DJ |
3331 | /* If we have pending signals or status, and a new signal, enqueue the |
3332 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3333 | breakpoint; it will be picked up again below. */ | |
3334 | if (signal != 0 | |
fa593d66 PA |
3335 | && (lwp->status_pending_p |
3336 | || lwp->pending_signals != NULL | |
3337 | || lwp->bp_reinsert != 0 | |
3338 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3339 | { |
3340 | struct pending_signals *p_sig; | |
bca929d3 | 3341 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3342 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3343 | p_sig->signal = signal; |
32ca6d61 DJ |
3344 | if (info == NULL) |
3345 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3346 | else | |
3347 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3348 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3349 | } |
3350 | ||
d50171e4 PA |
3351 | if (lwp->status_pending_p) |
3352 | { | |
3353 | if (debug_threads) | |
87ce2a04 DE |
3354 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3355 | " has pending status\n", | |
d86d4aaf | 3356 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3357 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3358 | return; |
3359 | } | |
0d62e5e8 | 3360 | |
0bfdf32f GB |
3361 | saved_thread = current_thread; |
3362 | current_thread = thread; | |
0d62e5e8 DJ |
3363 | |
3364 | if (debug_threads) | |
87ce2a04 | 3365 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3366 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3367 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3368 | |
3369 | /* This bit needs some thinking about. If we get a signal that | |
3370 | we must report while a single-step reinsert is still pending, | |
3371 | we often end up resuming the thread. It might be better to | |
3372 | (ew) allow a stack of pending events; then we could be sure that | |
3373 | the reinsert happened right away and not lose any signals. | |
3374 | ||
3375 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3376 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3377 | complete correctness, so it won't solve that problem. It may be |
3378 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3379 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3380 | { |
3381 | if (debug_threads) | |
87ce2a04 DE |
3382 | debug_printf (" pending reinsert at 0x%s\n", |
3383 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3384 | |
85e00e85 | 3385 | if (can_hardware_single_step ()) |
d50171e4 | 3386 | { |
fa593d66 PA |
3387 | if (fast_tp_collecting == 0) |
3388 | { | |
3389 | if (step == 0) | |
3390 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3391 | if (lwp->suspended) | |
3392 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3393 | lwp->suspended); | |
3394 | } | |
d50171e4 PA |
3395 | |
3396 | step = 1; | |
3397 | } | |
0d62e5e8 DJ |
3398 | |
3399 | /* Postpone any pending signal. It was enqueued above. */ | |
3400 | signal = 0; | |
3401 | } | |
3402 | ||
fa593d66 PA |
3403 | if (fast_tp_collecting == 1) |
3404 | { | |
3405 | if (debug_threads) | |
87ce2a04 DE |
3406 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3407 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3408 | lwpid_of (thread)); |
fa593d66 PA |
3409 | |
3410 | /* Postpone any pending signal. It was enqueued above. */ | |
3411 | signal = 0; | |
3412 | } | |
3413 | else if (fast_tp_collecting == 2) | |
3414 | { | |
3415 | if (debug_threads) | |
87ce2a04 DE |
3416 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3417 | " single-stepping\n", | |
d86d4aaf | 3418 | lwpid_of (thread)); |
fa593d66 PA |
3419 | |
3420 | if (can_hardware_single_step ()) | |
3421 | step = 1; | |
3422 | else | |
38e08fca GB |
3423 | { |
3424 | internal_error (__FILE__, __LINE__, | |
3425 | "moving out of jump pad single-stepping" | |
3426 | " not implemented on this target"); | |
3427 | } | |
fa593d66 PA |
3428 | |
3429 | /* Postpone any pending signal. It was enqueued above. */ | |
3430 | signal = 0; | |
3431 | } | |
3432 | ||
219f2f23 PA |
3433 | /* If we have while-stepping actions in this thread set it stepping. |
3434 | If we have a signal to deliver, it may or may not be set to | |
3435 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3436 | while-stepping into a signal handler. A possible smart thing to | |
3437 | do would be to set an internal breakpoint at the signal return | |
3438 | address, continue, and carry on catching this while-stepping | |
3439 | action only when that breakpoint is hit. A future | |
3440 | enhancement. */ | |
d86d4aaf | 3441 | if (thread->while_stepping != NULL |
219f2f23 PA |
3442 | && can_hardware_single_step ()) |
3443 | { | |
3444 | if (debug_threads) | |
87ce2a04 | 3445 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3446 | lwpid_of (thread)); |
219f2f23 PA |
3447 | step = 1; |
3448 | } | |
3449 | ||
582511be | 3450 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3451 | { |
0bfdf32f | 3452 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3453 | |
3454 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3455 | ||
3456 | if (debug_threads) | |
3457 | { | |
3458 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3459 | (long) lwp->stop_pc); | |
3460 | } | |
0d62e5e8 DJ |
3461 | } |
3462 | ||
fa593d66 PA |
3463 | /* If we have pending signals, consume one unless we are trying to |
3464 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3465 | collect. */ | |
3466 | if (lwp->pending_signals != NULL | |
3467 | && lwp->bp_reinsert == 0 | |
3468 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3469 | { |
3470 | struct pending_signals **p_sig; | |
3471 | ||
54a0b537 | 3472 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3473 | while ((*p_sig)->prev != NULL) |
3474 | p_sig = &(*p_sig)->prev; | |
3475 | ||
3476 | signal = (*p_sig)->signal; | |
32ca6d61 | 3477 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3478 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3479 | &(*p_sig)->info); |
32ca6d61 | 3480 | |
0d62e5e8 DJ |
3481 | free (*p_sig); |
3482 | *p_sig = NULL; | |
3483 | } | |
3484 | ||
aa5ca48f DE |
3485 | if (the_low_target.prepare_to_resume != NULL) |
3486 | the_low_target.prepare_to_resume (lwp); | |
3487 | ||
d86d4aaf | 3488 | regcache_invalidate_thread (thread); |
da6d8c04 | 3489 | errno = 0; |
54a0b537 | 3490 | lwp->stopped = 0; |
582511be | 3491 | lwp->stop_reason = LWP_STOPPED_BY_NO_REASON; |
54a0b537 | 3492 | lwp->stepping = step; |
d86d4aaf | 3493 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3494 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3495 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3496 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3497 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3498 | |
0bfdf32f | 3499 | current_thread = saved_thread; |
da6d8c04 | 3500 | if (errno) |
3221518c UW |
3501 | { |
3502 | /* ESRCH from ptrace either means that the thread was already | |
3503 | running (an error) or that it is gone (a race condition). If | |
3504 | it's gone, we will get a notification the next time we wait, | |
3505 | so we can ignore the error. We could differentiate these | |
3506 | two, but it's tricky without waiting; the thread still exists | |
3507 | as a zombie, so sending it signal 0 would succeed. So just | |
3508 | ignore ESRCH. */ | |
3509 | if (errno == ESRCH) | |
3510 | return; | |
3511 | ||
3512 | perror_with_name ("ptrace"); | |
3513 | } | |
da6d8c04 DJ |
3514 | } |
3515 | ||
2bd7c093 PA |
3516 | struct thread_resume_array |
3517 | { | |
3518 | struct thread_resume *resume; | |
3519 | size_t n; | |
3520 | }; | |
64386c31 | 3521 | |
ebcf782c DE |
3522 | /* This function is called once per thread via find_inferior. |
3523 | ARG is a pointer to a thread_resume_array struct. | |
3524 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3525 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3526 | |
3527 | This algorithm is O(threads * resume elements), but resume elements | |
3528 | is small (and will remain small at least until GDB supports thread | |
3529 | suspension). */ | |
ebcf782c | 3530 | |
2bd7c093 PA |
3531 | static int |
3532 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3533 | { |
d86d4aaf DE |
3534 | struct thread_info *thread = (struct thread_info *) entry; |
3535 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3536 | int ndx; |
2bd7c093 | 3537 | struct thread_resume_array *r; |
64386c31 | 3538 | |
2bd7c093 | 3539 | r = arg; |
64386c31 | 3540 | |
2bd7c093 | 3541 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3542 | { |
3543 | ptid_t ptid = r->resume[ndx].thread; | |
3544 | if (ptid_equal (ptid, minus_one_ptid) | |
3545 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3546 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3547 | of PID'. */ | |
d86d4aaf | 3548 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3549 | && (ptid_is_pid (ptid) |
3550 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3551 | { |
d50171e4 | 3552 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3553 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3554 | { |
3555 | if (debug_threads) | |
87ce2a04 DE |
3556 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3557 | (thread->last_status.kind | |
3558 | == TARGET_WAITKIND_STOPPED) | |
3559 | ? "stopped" | |
3560 | : "stopping", | |
d86d4aaf | 3561 | lwpid_of (thread)); |
d50171e4 PA |
3562 | |
3563 | continue; | |
3564 | } | |
3565 | ||
95954743 | 3566 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3567 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3568 | |
c2d6af84 PA |
3569 | lwp->step_range_start = lwp->resume->step_range_start; |
3570 | lwp->step_range_end = lwp->resume->step_range_end; | |
3571 | ||
fa593d66 PA |
3572 | /* If we had a deferred signal to report, dequeue one now. |
3573 | This can happen if LWP gets more than one signal while | |
3574 | trying to get out of a jump pad. */ | |
3575 | if (lwp->stopped | |
3576 | && !lwp->status_pending_p | |
3577 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3578 | { | |
3579 | lwp->status_pending_p = 1; | |
3580 | ||
3581 | if (debug_threads) | |
87ce2a04 DE |
3582 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3583 | "leaving status pending.\n", | |
d86d4aaf DE |
3584 | WSTOPSIG (lwp->status_pending), |
3585 | lwpid_of (thread)); | |
fa593d66 PA |
3586 | } |
3587 | ||
95954743 PA |
3588 | return 0; |
3589 | } | |
3590 | } | |
2bd7c093 PA |
3591 | |
3592 | /* No resume action for this thread. */ | |
3593 | lwp->resume = NULL; | |
64386c31 | 3594 | |
2bd7c093 | 3595 | return 0; |
5544ad89 DJ |
3596 | } |
3597 | ||
20ad9378 DE |
3598 | /* find_inferior callback for linux_resume. |
3599 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3600 | |
bd99dc85 PA |
3601 | static int |
3602 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3603 | { |
d86d4aaf DE |
3604 | struct thread_info *thread = (struct thread_info *) entry; |
3605 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3606 | |
bd99dc85 PA |
3607 | /* LWPs which will not be resumed are not interesting, because |
3608 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3609 | if (lwp->resume == NULL) |
bd99dc85 | 3610 | return 0; |
64386c31 | 3611 | |
582511be | 3612 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
3613 | * (int *) flag_p = 1; |
3614 | ||
3615 | return 0; | |
3616 | } | |
3617 | ||
3618 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3619 | internal breakpoint that we need to step over. It assumes that any | |
3620 | required STOP_PC adjustment has already been propagated to the | |
3621 | inferior's regcache. */ | |
3622 | ||
3623 | static int | |
3624 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3625 | { | |
d86d4aaf DE |
3626 | struct thread_info *thread = (struct thread_info *) entry; |
3627 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 3628 | struct thread_info *saved_thread; |
d50171e4 PA |
3629 | CORE_ADDR pc; |
3630 | ||
3631 | /* LWPs which will not be resumed are not interesting, because we | |
3632 | might not wait for them next time through linux_wait. */ | |
3633 | ||
3634 | if (!lwp->stopped) | |
3635 | { | |
3636 | if (debug_threads) | |
87ce2a04 | 3637 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3638 | lwpid_of (thread)); |
d50171e4 PA |
3639 | return 0; |
3640 | } | |
3641 | ||
8336d594 | 3642 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3643 | { |
3644 | if (debug_threads) | |
87ce2a04 DE |
3645 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3646 | " stopped\n", | |
d86d4aaf | 3647 | lwpid_of (thread)); |
d50171e4 PA |
3648 | return 0; |
3649 | } | |
3650 | ||
7984d532 PA |
3651 | gdb_assert (lwp->suspended >= 0); |
3652 | ||
3653 | if (lwp->suspended) | |
3654 | { | |
3655 | if (debug_threads) | |
87ce2a04 | 3656 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3657 | lwpid_of (thread)); |
7984d532 PA |
3658 | return 0; |
3659 | } | |
3660 | ||
d50171e4 PA |
3661 | if (!lwp->need_step_over) |
3662 | { | |
3663 | if (debug_threads) | |
d86d4aaf | 3664 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3665 | } |
5544ad89 | 3666 | |
bd99dc85 | 3667 | if (lwp->status_pending_p) |
d50171e4 PA |
3668 | { |
3669 | if (debug_threads) | |
87ce2a04 DE |
3670 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3671 | " status.\n", | |
d86d4aaf | 3672 | lwpid_of (thread)); |
d50171e4 PA |
3673 | return 0; |
3674 | } | |
3675 | ||
3676 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3677 | or we have. */ | |
3678 | pc = get_pc (lwp); | |
3679 | ||
3680 | /* If the PC has changed since we stopped, then don't do anything, | |
3681 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3682 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3683 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3684 | command, or poked thread's registers herself. */ | |
3685 | if (pc != lwp->stop_pc) | |
3686 | { | |
3687 | if (debug_threads) | |
87ce2a04 DE |
3688 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3689 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3690 | lwpid_of (thread), |
3691 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3692 | |
3693 | lwp->need_step_over = 0; | |
3694 | return 0; | |
3695 | } | |
3696 | ||
0bfdf32f GB |
3697 | saved_thread = current_thread; |
3698 | current_thread = thread; | |
d50171e4 | 3699 | |
8b07ae33 | 3700 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3701 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3702 | { |
8b07ae33 | 3703 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3704 | though. If the condition is being evaluated on the target's side |
3705 | and it evaluate to false, step over this breakpoint as well. */ | |
3706 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3707 | && gdb_condition_true_at_breakpoint (pc) |
3708 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3709 | { |
3710 | if (debug_threads) | |
87ce2a04 DE |
3711 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3712 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3713 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3714 | |
0bfdf32f | 3715 | current_thread = saved_thread; |
8b07ae33 PA |
3716 | return 0; |
3717 | } | |
3718 | else | |
3719 | { | |
3720 | if (debug_threads) | |
87ce2a04 DE |
3721 | debug_printf ("Need step over [LWP %ld]? yes, " |
3722 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3723 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3724 | |
8b07ae33 PA |
3725 | /* We've found an lwp that needs stepping over --- return 1 so |
3726 | that find_inferior stops looking. */ | |
0bfdf32f | 3727 | current_thread = saved_thread; |
8b07ae33 PA |
3728 | |
3729 | /* If the step over is cancelled, this is set again. */ | |
3730 | lwp->need_step_over = 0; | |
3731 | return 1; | |
3732 | } | |
d50171e4 PA |
3733 | } |
3734 | ||
0bfdf32f | 3735 | current_thread = saved_thread; |
d50171e4 PA |
3736 | |
3737 | if (debug_threads) | |
87ce2a04 DE |
3738 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3739 | " at 0x%s\n", | |
d86d4aaf | 3740 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3741 | |
bd99dc85 | 3742 | return 0; |
5544ad89 DJ |
3743 | } |
3744 | ||
d50171e4 PA |
3745 | /* Start a step-over operation on LWP. When LWP stopped at a |
3746 | breakpoint, to make progress, we need to remove the breakpoint out | |
3747 | of the way. If we let other threads run while we do that, they may | |
3748 | pass by the breakpoint location and miss hitting it. To avoid | |
3749 | that, a step-over momentarily stops all threads while LWP is | |
3750 | single-stepped while the breakpoint is temporarily uninserted from | |
3751 | the inferior. When the single-step finishes, we reinsert the | |
3752 | breakpoint, and let all threads that are supposed to be running, | |
3753 | run again. | |
3754 | ||
3755 | On targets that don't support hardware single-step, we don't | |
3756 | currently support full software single-stepping. Instead, we only | |
3757 | support stepping over the thread event breakpoint, by asking the | |
3758 | low target where to place a reinsert breakpoint. Since this | |
3759 | routine assumes the breakpoint being stepped over is a thread event | |
3760 | breakpoint, it usually assumes the return address of the current | |
3761 | function is a good enough place to set the reinsert breakpoint. */ | |
3762 | ||
3763 | static int | |
3764 | start_step_over (struct lwp_info *lwp) | |
3765 | { | |
d86d4aaf | 3766 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3767 | struct thread_info *saved_thread; |
d50171e4 PA |
3768 | CORE_ADDR pc; |
3769 | int step; | |
3770 | ||
3771 | if (debug_threads) | |
87ce2a04 | 3772 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3773 | lwpid_of (thread)); |
d50171e4 | 3774 | |
7984d532 PA |
3775 | stop_all_lwps (1, lwp); |
3776 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3777 | |
3778 | if (debug_threads) | |
87ce2a04 | 3779 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3780 | |
3781 | /* Note, we should always reach here with an already adjusted PC, | |
3782 | either by GDB (if we're resuming due to GDB's request), or by our | |
3783 | caller, if we just finished handling an internal breakpoint GDB | |
3784 | shouldn't care about. */ | |
3785 | pc = get_pc (lwp); | |
3786 | ||
0bfdf32f GB |
3787 | saved_thread = current_thread; |
3788 | current_thread = thread; | |
d50171e4 PA |
3789 | |
3790 | lwp->bp_reinsert = pc; | |
3791 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3792 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3793 | |
3794 | if (can_hardware_single_step ()) | |
3795 | { | |
3796 | step = 1; | |
3797 | } | |
3798 | else | |
3799 | { | |
3800 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3801 | set_reinsert_breakpoint (raddr); | |
3802 | step = 0; | |
3803 | } | |
3804 | ||
0bfdf32f | 3805 | current_thread = saved_thread; |
d50171e4 PA |
3806 | |
3807 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3808 | ||
3809 | /* Require next event from this LWP. */ | |
d86d4aaf | 3810 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3811 | return 1; |
3812 | } | |
3813 | ||
3814 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3815 | start_step_over, if still there, and delete any reinsert | |
3816 | breakpoints we've set, on non hardware single-step targets. */ | |
3817 | ||
3818 | static int | |
3819 | finish_step_over (struct lwp_info *lwp) | |
3820 | { | |
3821 | if (lwp->bp_reinsert != 0) | |
3822 | { | |
3823 | if (debug_threads) | |
87ce2a04 | 3824 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3825 | |
3826 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3827 | may be no breakpoint to reinsert there by now. */ | |
3828 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3829 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3830 | |
3831 | lwp->bp_reinsert = 0; | |
3832 | ||
3833 | /* Delete any software-single-step reinsert breakpoints. No | |
3834 | longer needed. We don't have to worry about other threads | |
3835 | hitting this trap, and later not being able to explain it, | |
3836 | because we were stepping over a breakpoint, and we hold all | |
3837 | threads but LWP stopped while doing that. */ | |
3838 | if (!can_hardware_single_step ()) | |
3839 | delete_reinsert_breakpoints (); | |
3840 | ||
3841 | step_over_bkpt = null_ptid; | |
3842 | return 1; | |
3843 | } | |
3844 | else | |
3845 | return 0; | |
3846 | } | |
3847 | ||
5544ad89 DJ |
3848 | /* This function is called once per thread. We check the thread's resume |
3849 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3850 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3851 | |
bd99dc85 PA |
3852 | For threads which we aren't explicitly told otherwise, we preserve |
3853 | the stepping flag; this is used for stepping over gdbserver-placed | |
3854 | breakpoints. | |
3855 | ||
3856 | If pending_flags was set in any thread, we queue any needed | |
3857 | signals, since we won't actually resume. We already have a pending | |
3858 | event to report, so we don't need to preserve any step requests; | |
3859 | they should be re-issued if necessary. */ | |
3860 | ||
3861 | static int | |
3862 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3863 | { |
d86d4aaf DE |
3864 | struct thread_info *thread = (struct thread_info *) entry; |
3865 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3866 | int step; |
d50171e4 PA |
3867 | int leave_all_stopped = * (int *) arg; |
3868 | int leave_pending; | |
5544ad89 | 3869 | |
2bd7c093 | 3870 | if (lwp->resume == NULL) |
bd99dc85 | 3871 | return 0; |
5544ad89 | 3872 | |
bd99dc85 | 3873 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3874 | { |
bd99dc85 | 3875 | if (debug_threads) |
d86d4aaf | 3876 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3877 | |
3878 | if (!lwp->stopped) | |
3879 | { | |
3880 | if (debug_threads) | |
d86d4aaf | 3881 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3882 | |
d50171e4 PA |
3883 | /* Stop the thread, and wait for the event asynchronously, |
3884 | through the event loop. */ | |
02fc4de7 | 3885 | send_sigstop (lwp); |
bd99dc85 PA |
3886 | } |
3887 | else | |
3888 | { | |
3889 | if (debug_threads) | |
87ce2a04 | 3890 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3891 | lwpid_of (thread)); |
d50171e4 PA |
3892 | |
3893 | /* The LWP may have been stopped in an internal event that | |
3894 | was not meant to be notified back to GDB (e.g., gdbserver | |
3895 | breakpoint), so we should be reporting a stop event in | |
3896 | this case too. */ | |
3897 | ||
3898 | /* If the thread already has a pending SIGSTOP, this is a | |
3899 | no-op. Otherwise, something later will presumably resume | |
3900 | the thread and this will cause it to cancel any pending | |
3901 | operation, due to last_resume_kind == resume_stop. If | |
3902 | the thread already has a pending status to report, we | |
3903 | will still report it the next time we wait - see | |
3904 | status_pending_p_callback. */ | |
1a981360 PA |
3905 | |
3906 | /* If we already have a pending signal to report, then | |
3907 | there's no need to queue a SIGSTOP, as this means we're | |
3908 | midway through moving the LWP out of the jumppad, and we | |
3909 | will report the pending signal as soon as that is | |
3910 | finished. */ | |
3911 | if (lwp->pending_signals_to_report == NULL) | |
3912 | send_sigstop (lwp); | |
bd99dc85 | 3913 | } |
32ca6d61 | 3914 | |
bd99dc85 PA |
3915 | /* For stop requests, we're done. */ |
3916 | lwp->resume = NULL; | |
fc7238bb | 3917 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3918 | return 0; |
5544ad89 DJ |
3919 | } |
3920 | ||
bd99dc85 PA |
3921 | /* If this thread which is about to be resumed has a pending status, |
3922 | then don't resume any threads - we can just report the pending | |
3923 | status. Make sure to queue any signals that would otherwise be | |
3924 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3925 | thread has a pending status. If there's a thread that needs the |
3926 | step-over-breakpoint dance, then don't resume any other thread | |
3927 | but that particular one. */ | |
3928 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3929 | |
d50171e4 | 3930 | if (!leave_pending) |
bd99dc85 PA |
3931 | { |
3932 | if (debug_threads) | |
d86d4aaf | 3933 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3934 | |
d50171e4 | 3935 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3936 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3937 | } |
3938 | else | |
3939 | { | |
3940 | if (debug_threads) | |
d86d4aaf | 3941 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3942 | |
bd99dc85 PA |
3943 | /* If we have a new signal, enqueue the signal. */ |
3944 | if (lwp->resume->sig != 0) | |
3945 | { | |
3946 | struct pending_signals *p_sig; | |
3947 | p_sig = xmalloc (sizeof (*p_sig)); | |
3948 | p_sig->prev = lwp->pending_signals; | |
3949 | p_sig->signal = lwp->resume->sig; | |
3950 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3951 | ||
3952 | /* If this is the same signal we were previously stopped by, | |
3953 | make sure to queue its siginfo. We can ignore the return | |
3954 | value of ptrace; if it fails, we'll skip | |
3955 | PTRACE_SETSIGINFO. */ | |
3956 | if (WIFSTOPPED (lwp->last_status) | |
3957 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3958 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3959 | &p_sig->info); |
bd99dc85 PA |
3960 | |
3961 | lwp->pending_signals = p_sig; | |
3962 | } | |
3963 | } | |
5544ad89 | 3964 | |
fc7238bb | 3965 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3966 | lwp->resume = NULL; |
5544ad89 | 3967 | return 0; |
0d62e5e8 DJ |
3968 | } |
3969 | ||
3970 | static void | |
2bd7c093 | 3971 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3972 | { |
2bd7c093 | 3973 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3974 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3975 | int any_pending; |
3976 | int leave_all_stopped; | |
c6ecbae5 | 3977 | |
87ce2a04 DE |
3978 | if (debug_threads) |
3979 | { | |
3980 | debug_enter (); | |
3981 | debug_printf ("linux_resume:\n"); | |
3982 | } | |
3983 | ||
2bd7c093 | 3984 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3985 | |
d50171e4 PA |
3986 | /* If there is a thread which would otherwise be resumed, which has |
3987 | a pending status, then don't resume any threads - we can just | |
3988 | report the pending status. Make sure to queue any signals that | |
3989 | would otherwise be sent. In non-stop mode, we'll apply this | |
3990 | logic to each thread individually. We consume all pending events | |
3991 | before considering to start a step-over (in all-stop). */ | |
3992 | any_pending = 0; | |
bd99dc85 | 3993 | if (!non_stop) |
d86d4aaf | 3994 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
3995 | |
3996 | /* If there is a thread which would otherwise be resumed, which is | |
3997 | stopped at a breakpoint that needs stepping over, then don't | |
3998 | resume any threads - have it step over the breakpoint with all | |
3999 | other threads stopped, then resume all threads again. Make sure | |
4000 | to queue any signals that would otherwise be delivered or | |
4001 | queued. */ | |
4002 | if (!any_pending && supports_breakpoints ()) | |
4003 | need_step_over | |
d86d4aaf DE |
4004 | = (struct thread_info *) find_inferior (&all_threads, |
4005 | need_step_over_p, NULL); | |
d50171e4 PA |
4006 | |
4007 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4008 | ||
4009 | if (debug_threads) | |
4010 | { | |
4011 | if (need_step_over != NULL) | |
87ce2a04 | 4012 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4013 | else if (any_pending) |
87ce2a04 DE |
4014 | debug_printf ("Not resuming, all-stop and found " |
4015 | "an LWP with pending status\n"); | |
d50171e4 | 4016 | else |
87ce2a04 | 4017 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4018 | } |
4019 | ||
4020 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4021 | otherwise deliver. */ | |
4022 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4023 | ||
4024 | if (need_step_over) | |
d86d4aaf | 4025 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4026 | |
4027 | if (debug_threads) | |
4028 | { | |
4029 | debug_printf ("linux_resume done\n"); | |
4030 | debug_exit (); | |
4031 | } | |
d50171e4 PA |
4032 | } |
4033 | ||
4034 | /* This function is called once per thread. We check the thread's | |
4035 | last resume request, which will tell us whether to resume, step, or | |
4036 | leave the thread stopped. Any signal the client requested to be | |
4037 | delivered has already been enqueued at this point. | |
4038 | ||
4039 | If any thread that GDB wants running is stopped at an internal | |
4040 | breakpoint that needs stepping over, we start a step-over operation | |
4041 | on that particular thread, and leave all others stopped. */ | |
4042 | ||
7984d532 PA |
4043 | static int |
4044 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4045 | { |
d86d4aaf DE |
4046 | struct thread_info *thread = (struct thread_info *) entry; |
4047 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4048 | int step; |
4049 | ||
7984d532 PA |
4050 | if (lwp == except) |
4051 | return 0; | |
d50171e4 PA |
4052 | |
4053 | if (debug_threads) | |
d86d4aaf | 4054 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4055 | |
4056 | if (!lwp->stopped) | |
4057 | { | |
4058 | if (debug_threads) | |
d86d4aaf | 4059 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4060 | return 0; |
d50171e4 PA |
4061 | } |
4062 | ||
02fc4de7 PA |
4063 | if (thread->last_resume_kind == resume_stop |
4064 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4065 | { |
4066 | if (debug_threads) | |
87ce2a04 | 4067 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4068 | lwpid_of (thread)); |
7984d532 | 4069 | return 0; |
d50171e4 PA |
4070 | } |
4071 | ||
4072 | if (lwp->status_pending_p) | |
4073 | { | |
4074 | if (debug_threads) | |
87ce2a04 | 4075 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4076 | lwpid_of (thread)); |
7984d532 | 4077 | return 0; |
d50171e4 PA |
4078 | } |
4079 | ||
7984d532 PA |
4080 | gdb_assert (lwp->suspended >= 0); |
4081 | ||
d50171e4 PA |
4082 | if (lwp->suspended) |
4083 | { | |
4084 | if (debug_threads) | |
d86d4aaf | 4085 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4086 | return 0; |
d50171e4 PA |
4087 | } |
4088 | ||
1a981360 PA |
4089 | if (thread->last_resume_kind == resume_stop |
4090 | && lwp->pending_signals_to_report == NULL | |
4091 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4092 | { |
4093 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4094 | last_status.kind check above would catch it, and we wouldn't | |
4095 | reach here. This LWP may have been momentarily paused by a | |
4096 | stop_all_lwps call while handling for example, another LWP's | |
4097 | step-over. In that case, the pending expected SIGSTOP signal | |
4098 | that was queued at vCont;t handling time will have already | |
4099 | been consumed by wait_for_sigstop, and so we need to requeue | |
4100 | another one here. Note that if the LWP already has a SIGSTOP | |
4101 | pending, this is a no-op. */ | |
4102 | ||
4103 | if (debug_threads) | |
87ce2a04 DE |
4104 | debug_printf ("Client wants LWP %ld to stop. " |
4105 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4106 | lwpid_of (thread)); |
02fc4de7 PA |
4107 | |
4108 | send_sigstop (lwp); | |
4109 | } | |
4110 | ||
8336d594 | 4111 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4112 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4113 | return 0; |
4114 | } | |
4115 | ||
4116 | static int | |
4117 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4118 | { | |
d86d4aaf DE |
4119 | struct thread_info *thread = (struct thread_info *) entry; |
4120 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4121 | |
4122 | if (lwp == except) | |
4123 | return 0; | |
4124 | ||
4125 | lwp->suspended--; | |
4126 | gdb_assert (lwp->suspended >= 0); | |
4127 | ||
4128 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4129 | } |
4130 | ||
4131 | /* When we finish a step-over, set threads running again. If there's | |
4132 | another thread that may need a step-over, now's the time to start | |
4133 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4134 | ||
4135 | static void | |
4136 | proceed_all_lwps (void) | |
4137 | { | |
d86d4aaf | 4138 | struct thread_info *need_step_over; |
d50171e4 PA |
4139 | |
4140 | /* If there is a thread which would otherwise be resumed, which is | |
4141 | stopped at a breakpoint that needs stepping over, then don't | |
4142 | resume any threads - have it step over the breakpoint with all | |
4143 | other threads stopped, then resume all threads again. */ | |
4144 | ||
4145 | if (supports_breakpoints ()) | |
4146 | { | |
4147 | need_step_over | |
d86d4aaf DE |
4148 | = (struct thread_info *) find_inferior (&all_threads, |
4149 | need_step_over_p, NULL); | |
d50171e4 PA |
4150 | |
4151 | if (need_step_over != NULL) | |
4152 | { | |
4153 | if (debug_threads) | |
87ce2a04 DE |
4154 | debug_printf ("proceed_all_lwps: found " |
4155 | "thread %ld needing a step-over\n", | |
4156 | lwpid_of (need_step_over)); | |
d50171e4 | 4157 | |
d86d4aaf | 4158 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4159 | return; |
4160 | } | |
4161 | } | |
5544ad89 | 4162 | |
d50171e4 | 4163 | if (debug_threads) |
87ce2a04 | 4164 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4165 | |
d86d4aaf | 4166 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4167 | } |
4168 | ||
4169 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4170 | pending statuses, are set to run again, except for EXCEPT, if not | |
4171 | NULL. This undoes a stop_all_lwps call. */ | |
4172 | ||
4173 | static void | |
7984d532 | 4174 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4175 | { |
5544ad89 DJ |
4176 | if (debug_threads) |
4177 | { | |
87ce2a04 | 4178 | debug_enter (); |
d50171e4 | 4179 | if (except) |
87ce2a04 | 4180 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4181 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4182 | else |
87ce2a04 | 4183 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4184 | } |
4185 | ||
7984d532 | 4186 | if (unsuspend) |
d86d4aaf | 4187 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4188 | else |
d86d4aaf | 4189 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4190 | |
4191 | if (debug_threads) | |
4192 | { | |
4193 | debug_printf ("unstop_all_lwps done\n"); | |
4194 | debug_exit (); | |
4195 | } | |
0d62e5e8 DJ |
4196 | } |
4197 | ||
58caa3dc DJ |
4198 | |
4199 | #ifdef HAVE_LINUX_REGSETS | |
4200 | ||
1faeff08 MR |
4201 | #define use_linux_regsets 1 |
4202 | ||
030031ee PA |
4203 | /* Returns true if REGSET has been disabled. */ |
4204 | ||
4205 | static int | |
4206 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4207 | { | |
4208 | return (info->disabled_regsets != NULL | |
4209 | && info->disabled_regsets[regset - info->regsets]); | |
4210 | } | |
4211 | ||
4212 | /* Disable REGSET. */ | |
4213 | ||
4214 | static void | |
4215 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4216 | { | |
4217 | int dr_offset; | |
4218 | ||
4219 | dr_offset = regset - info->regsets; | |
4220 | if (info->disabled_regsets == NULL) | |
4221 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4222 | info->disabled_regsets[dr_offset] = 1; | |
4223 | } | |
4224 | ||
58caa3dc | 4225 | static int |
3aee8918 PA |
4226 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4227 | struct regcache *regcache) | |
58caa3dc DJ |
4228 | { |
4229 | struct regset_info *regset; | |
e9d25b98 | 4230 | int saw_general_regs = 0; |
95954743 | 4231 | int pid; |
1570b33e | 4232 | struct iovec iov; |
58caa3dc | 4233 | |
0bfdf32f | 4234 | pid = lwpid_of (current_thread); |
28eef672 | 4235 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4236 | { |
1570b33e L |
4237 | void *buf, *data; |
4238 | int nt_type, res; | |
58caa3dc | 4239 | |
030031ee | 4240 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4241 | continue; |
58caa3dc | 4242 | |
bca929d3 | 4243 | buf = xmalloc (regset->size); |
1570b33e L |
4244 | |
4245 | nt_type = regset->nt_type; | |
4246 | if (nt_type) | |
4247 | { | |
4248 | iov.iov_base = buf; | |
4249 | iov.iov_len = regset->size; | |
4250 | data = (void *) &iov; | |
4251 | } | |
4252 | else | |
4253 | data = buf; | |
4254 | ||
dfb64f85 | 4255 | #ifndef __sparc__ |
f15f9948 | 4256 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4257 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4258 | #else |
1570b33e | 4259 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4260 | #endif |
58caa3dc DJ |
4261 | if (res < 0) |
4262 | { | |
4263 | if (errno == EIO) | |
4264 | { | |
52fa2412 | 4265 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4266 | this process mode. */ |
030031ee | 4267 | disable_regset (regsets_info, regset); |
58caa3dc | 4268 | } |
e5a9158d AA |
4269 | else if (errno == ENODATA) |
4270 | { | |
4271 | /* ENODATA may be returned if the regset is currently | |
4272 | not "active". This can happen in normal operation, | |
4273 | so suppress the warning in this case. */ | |
4274 | } | |
58caa3dc DJ |
4275 | else |
4276 | { | |
0d62e5e8 | 4277 | char s[256]; |
95954743 PA |
4278 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4279 | pid); | |
0d62e5e8 | 4280 | perror (s); |
58caa3dc DJ |
4281 | } |
4282 | } | |
098dbe61 AA |
4283 | else |
4284 | { | |
4285 | if (regset->type == GENERAL_REGS) | |
4286 | saw_general_regs = 1; | |
4287 | regset->store_function (regcache, buf); | |
4288 | } | |
fdeb2a12 | 4289 | free (buf); |
58caa3dc | 4290 | } |
e9d25b98 DJ |
4291 | if (saw_general_regs) |
4292 | return 0; | |
4293 | else | |
4294 | return 1; | |
58caa3dc DJ |
4295 | } |
4296 | ||
4297 | static int | |
3aee8918 PA |
4298 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4299 | struct regcache *regcache) | |
58caa3dc DJ |
4300 | { |
4301 | struct regset_info *regset; | |
e9d25b98 | 4302 | int saw_general_regs = 0; |
95954743 | 4303 | int pid; |
1570b33e | 4304 | struct iovec iov; |
58caa3dc | 4305 | |
0bfdf32f | 4306 | pid = lwpid_of (current_thread); |
28eef672 | 4307 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4308 | { |
1570b33e L |
4309 | void *buf, *data; |
4310 | int nt_type, res; | |
58caa3dc | 4311 | |
feea5f36 AA |
4312 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4313 | || regset->fill_function == NULL) | |
28eef672 | 4314 | continue; |
58caa3dc | 4315 | |
bca929d3 | 4316 | buf = xmalloc (regset->size); |
545587ee DJ |
4317 | |
4318 | /* First fill the buffer with the current register set contents, | |
4319 | in case there are any items in the kernel's regset that are | |
4320 | not in gdbserver's regcache. */ | |
1570b33e L |
4321 | |
4322 | nt_type = regset->nt_type; | |
4323 | if (nt_type) | |
4324 | { | |
4325 | iov.iov_base = buf; | |
4326 | iov.iov_len = regset->size; | |
4327 | data = (void *) &iov; | |
4328 | } | |
4329 | else | |
4330 | data = buf; | |
4331 | ||
dfb64f85 | 4332 | #ifndef __sparc__ |
f15f9948 | 4333 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4334 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4335 | #else |
689cc2ae | 4336 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4337 | #endif |
545587ee DJ |
4338 | |
4339 | if (res == 0) | |
4340 | { | |
4341 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4342 | regset->fill_function (regcache, buf); |
545587ee DJ |
4343 | |
4344 | /* Only now do we write the register set. */ | |
dfb64f85 | 4345 | #ifndef __sparc__ |
f15f9948 | 4346 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4347 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4348 | #else |
1570b33e | 4349 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4350 | #endif |
545587ee DJ |
4351 | } |
4352 | ||
58caa3dc DJ |
4353 | if (res < 0) |
4354 | { | |
4355 | if (errno == EIO) | |
4356 | { | |
52fa2412 | 4357 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4358 | this process mode. */ |
030031ee | 4359 | disable_regset (regsets_info, regset); |
58caa3dc | 4360 | } |
3221518c UW |
4361 | else if (errno == ESRCH) |
4362 | { | |
1b3f6016 PA |
4363 | /* At this point, ESRCH should mean the process is |
4364 | already gone, in which case we simply ignore attempts | |
4365 | to change its registers. See also the related | |
4366 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4367 | free (buf); |
3221518c UW |
4368 | return 0; |
4369 | } | |
58caa3dc DJ |
4370 | else |
4371 | { | |
ce3a066d | 4372 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4373 | } |
4374 | } | |
e9d25b98 DJ |
4375 | else if (regset->type == GENERAL_REGS) |
4376 | saw_general_regs = 1; | |
09ec9b38 | 4377 | free (buf); |
58caa3dc | 4378 | } |
e9d25b98 DJ |
4379 | if (saw_general_regs) |
4380 | return 0; | |
4381 | else | |
4382 | return 1; | |
58caa3dc DJ |
4383 | } |
4384 | ||
1faeff08 | 4385 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4386 | |
1faeff08 | 4387 | #define use_linux_regsets 0 |
3aee8918 PA |
4388 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4389 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4390 | |
58caa3dc | 4391 | #endif |
1faeff08 MR |
4392 | |
4393 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4394 | calls or 0 if it has to be transferred individually. */ | |
4395 | ||
4396 | static int | |
3aee8918 | 4397 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4398 | { |
4399 | unsigned char mask = 1 << (regno % 8); | |
4400 | size_t index = regno / 8; | |
4401 | ||
4402 | return (use_linux_regsets | |
3aee8918 PA |
4403 | && (regs_info->regset_bitmap == NULL |
4404 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4405 | } |
4406 | ||
58caa3dc | 4407 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4408 | |
4409 | int | |
3aee8918 | 4410 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4411 | { |
4412 | int addr; | |
4413 | ||
3aee8918 | 4414 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4415 | error ("Invalid register number %d.", regnum); |
4416 | ||
3aee8918 | 4417 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4418 | |
4419 | return addr; | |
4420 | } | |
4421 | ||
4422 | /* Fetch one register. */ | |
4423 | static void | |
3aee8918 PA |
4424 | fetch_register (const struct usrregs_info *usrregs, |
4425 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4426 | { |
4427 | CORE_ADDR regaddr; | |
4428 | int i, size; | |
4429 | char *buf; | |
4430 | int pid; | |
4431 | ||
3aee8918 | 4432 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4433 | return; |
4434 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4435 | return; | |
4436 | ||
3aee8918 | 4437 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4438 | if (regaddr == -1) |
4439 | return; | |
4440 | ||
3aee8918 PA |
4441 | size = ((register_size (regcache->tdesc, regno) |
4442 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4443 | & -sizeof (PTRACE_XFER_TYPE)); |
4444 | buf = alloca (size); | |
4445 | ||
0bfdf32f | 4446 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4447 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4448 | { | |
4449 | errno = 0; | |
4450 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4451 | ptrace (PTRACE_PEEKUSER, pid, | |
4452 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4453 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4454 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4455 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4456 | if (errno != 0) | |
4457 | error ("reading register %d: %s", regno, strerror (errno)); | |
4458 | } | |
4459 | ||
4460 | if (the_low_target.supply_ptrace_register) | |
4461 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4462 | else | |
4463 | supply_register (regcache, regno, buf); | |
4464 | } | |
4465 | ||
4466 | /* Store one register. */ | |
4467 | static void | |
3aee8918 PA |
4468 | store_register (const struct usrregs_info *usrregs, |
4469 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4470 | { |
4471 | CORE_ADDR regaddr; | |
4472 | int i, size; | |
4473 | char *buf; | |
4474 | int pid; | |
4475 | ||
3aee8918 | 4476 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4477 | return; |
4478 | if ((*the_low_target.cannot_store_register) (regno)) | |
4479 | return; | |
4480 | ||
3aee8918 | 4481 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4482 | if (regaddr == -1) |
4483 | return; | |
4484 | ||
3aee8918 PA |
4485 | size = ((register_size (regcache->tdesc, regno) |
4486 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4487 | & -sizeof (PTRACE_XFER_TYPE)); |
4488 | buf = alloca (size); | |
4489 | memset (buf, 0, size); | |
4490 | ||
4491 | if (the_low_target.collect_ptrace_register) | |
4492 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4493 | else | |
4494 | collect_register (regcache, regno, buf); | |
4495 | ||
0bfdf32f | 4496 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4497 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4498 | { | |
4499 | errno = 0; | |
4500 | ptrace (PTRACE_POKEUSER, pid, | |
4501 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4502 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4503 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4504 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4505 | if (errno != 0) |
4506 | { | |
4507 | /* At this point, ESRCH should mean the process is | |
4508 | already gone, in which case we simply ignore attempts | |
4509 | to change its registers. See also the related | |
4510 | comment in linux_resume_one_lwp. */ | |
4511 | if (errno == ESRCH) | |
4512 | return; | |
4513 | ||
4514 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4515 | error ("writing register %d: %s", regno, strerror (errno)); | |
4516 | } | |
4517 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4518 | } | |
4519 | } | |
4520 | ||
4521 | /* Fetch all registers, or just one, from the child process. | |
4522 | If REGNO is -1, do this for all registers, skipping any that are | |
4523 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4524 | unless ALL is non-zero. | |
4525 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4526 | static void | |
3aee8918 PA |
4527 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4528 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4529 | { |
3aee8918 PA |
4530 | struct usrregs_info *usr = regs_info->usrregs; |
4531 | ||
1faeff08 MR |
4532 | if (regno == -1) |
4533 | { | |
3aee8918 PA |
4534 | for (regno = 0; regno < usr->num_regs; regno++) |
4535 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4536 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4537 | } |
4538 | else | |
3aee8918 | 4539 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4540 | } |
4541 | ||
4542 | /* Store our register values back into the inferior. | |
4543 | If REGNO is -1, do this for all registers, skipping any that are | |
4544 | assumed to have been saved by regsets_store_inferior_registers, | |
4545 | unless ALL is non-zero. | |
4546 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4547 | static void | |
3aee8918 PA |
4548 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4549 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4550 | { |
3aee8918 PA |
4551 | struct usrregs_info *usr = regs_info->usrregs; |
4552 | ||
1faeff08 MR |
4553 | if (regno == -1) |
4554 | { | |
3aee8918 PA |
4555 | for (regno = 0; regno < usr->num_regs; regno++) |
4556 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4557 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4558 | } |
4559 | else | |
3aee8918 | 4560 | store_register (usr, regcache, regno); |
1faeff08 MR |
4561 | } |
4562 | ||
4563 | #else /* !HAVE_LINUX_USRREGS */ | |
4564 | ||
3aee8918 PA |
4565 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4566 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4567 | |
58caa3dc | 4568 | #endif |
1faeff08 MR |
4569 | |
4570 | ||
4571 | void | |
4572 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4573 | { | |
4574 | int use_regsets; | |
4575 | int all = 0; | |
3aee8918 | 4576 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4577 | |
4578 | if (regno == -1) | |
4579 | { | |
3aee8918 PA |
4580 | if (the_low_target.fetch_register != NULL |
4581 | && regs_info->usrregs != NULL) | |
4582 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4583 | (*the_low_target.fetch_register) (regcache, regno); |
4584 | ||
3aee8918 PA |
4585 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4586 | if (regs_info->usrregs != NULL) | |
4587 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4588 | } |
4589 | else | |
4590 | { | |
c14dfd32 PA |
4591 | if (the_low_target.fetch_register != NULL |
4592 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4593 | return; | |
4594 | ||
3aee8918 | 4595 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4596 | if (use_regsets) |
3aee8918 PA |
4597 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4598 | regcache); | |
4599 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4600 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4601 | } |
58caa3dc DJ |
4602 | } |
4603 | ||
4604 | void | |
442ea881 | 4605 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4606 | { |
1faeff08 MR |
4607 | int use_regsets; |
4608 | int all = 0; | |
3aee8918 | 4609 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4610 | |
4611 | if (regno == -1) | |
4612 | { | |
3aee8918 PA |
4613 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4614 | regcache); | |
4615 | if (regs_info->usrregs != NULL) | |
4616 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4617 | } |
4618 | else | |
4619 | { | |
3aee8918 | 4620 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4621 | if (use_regsets) |
3aee8918 PA |
4622 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4623 | regcache); | |
4624 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4625 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4626 | } |
58caa3dc DJ |
4627 | } |
4628 | ||
da6d8c04 | 4629 | |
da6d8c04 DJ |
4630 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4631 | to debugger memory starting at MYADDR. */ | |
4632 | ||
c3e735a6 | 4633 | static int |
f450004a | 4634 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4635 | { |
0bfdf32f | 4636 | int pid = lwpid_of (current_thread); |
4934b29e MR |
4637 | register PTRACE_XFER_TYPE *buffer; |
4638 | register CORE_ADDR addr; | |
4639 | register int count; | |
4640 | char filename[64]; | |
da6d8c04 | 4641 | register int i; |
4934b29e | 4642 | int ret; |
fd462a61 | 4643 | int fd; |
fd462a61 DJ |
4644 | |
4645 | /* Try using /proc. Don't bother for one word. */ | |
4646 | if (len >= 3 * sizeof (long)) | |
4647 | { | |
4934b29e MR |
4648 | int bytes; |
4649 | ||
fd462a61 DJ |
4650 | /* We could keep this file open and cache it - possibly one per |
4651 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4652 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4653 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4654 | if (fd == -1) | |
4655 | goto no_proc; | |
4656 | ||
4657 | /* If pread64 is available, use it. It's faster if the kernel | |
4658 | supports it (only one syscall), and it's 64-bit safe even on | |
4659 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4660 | application). */ | |
4661 | #ifdef HAVE_PREAD64 | |
4934b29e | 4662 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4663 | #else |
4934b29e MR |
4664 | bytes = -1; |
4665 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4666 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4667 | #endif |
fd462a61 DJ |
4668 | |
4669 | close (fd); | |
4934b29e MR |
4670 | if (bytes == len) |
4671 | return 0; | |
4672 | ||
4673 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4674 | if (bytes > 0) | |
4675 | { | |
4676 | memaddr += bytes; | |
4677 | myaddr += bytes; | |
4678 | len -= bytes; | |
4679 | } | |
fd462a61 | 4680 | } |
da6d8c04 | 4681 | |
fd462a61 | 4682 | no_proc: |
4934b29e MR |
4683 | /* Round starting address down to longword boundary. */ |
4684 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4685 | /* Round ending address up; get number of longwords that makes. */ | |
4686 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4687 | / sizeof (PTRACE_XFER_TYPE)); | |
4688 | /* Allocate buffer of that many longwords. */ | |
4689 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4690 | ||
da6d8c04 | 4691 | /* Read all the longwords */ |
4934b29e | 4692 | errno = 0; |
da6d8c04 DJ |
4693 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4694 | { | |
14ce3065 DE |
4695 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4696 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4697 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4698 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4699 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4700 | if (errno) |
4934b29e | 4701 | break; |
da6d8c04 | 4702 | } |
4934b29e | 4703 | ret = errno; |
da6d8c04 DJ |
4704 | |
4705 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4706 | if (i > 0) |
4707 | { | |
4708 | i *= sizeof (PTRACE_XFER_TYPE); | |
4709 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4710 | memcpy (myaddr, | |
4711 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4712 | i < len ? i : len); | |
4713 | } | |
c3e735a6 | 4714 | |
4934b29e | 4715 | return ret; |
da6d8c04 DJ |
4716 | } |
4717 | ||
93ae6fdc PA |
4718 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4719 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4720 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4721 | |
ce3a066d | 4722 | static int |
f450004a | 4723 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4724 | { |
4725 | register int i; | |
4726 | /* Round starting address down to longword boundary. */ | |
4727 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4728 | /* Round ending address up; get number of longwords that makes. */ | |
4729 | register int count | |
493e2a69 MS |
4730 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4731 | / sizeof (PTRACE_XFER_TYPE); | |
4732 | ||
da6d8c04 | 4733 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4734 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4735 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4736 | ||
0bfdf32f | 4737 | int pid = lwpid_of (current_thread); |
da6d8c04 | 4738 | |
f0ae6fc3 PA |
4739 | if (len == 0) |
4740 | { | |
4741 | /* Zero length write always succeeds. */ | |
4742 | return 0; | |
4743 | } | |
4744 | ||
0d62e5e8 DJ |
4745 | if (debug_threads) |
4746 | { | |
58d6951d DJ |
4747 | /* Dump up to four bytes. */ |
4748 | unsigned int val = * (unsigned int *) myaddr; | |
4749 | if (len == 1) | |
4750 | val = val & 0xff; | |
4751 | else if (len == 2) | |
4752 | val = val & 0xffff; | |
4753 | else if (len == 3) | |
4754 | val = val & 0xffffff; | |
87ce2a04 DE |
4755 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4756 | val, (long)memaddr); | |
0d62e5e8 DJ |
4757 | } |
4758 | ||
da6d8c04 DJ |
4759 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4760 | ||
93ae6fdc | 4761 | errno = 0; |
14ce3065 DE |
4762 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4763 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4764 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4765 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4766 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4767 | if (errno) |
4768 | return errno; | |
da6d8c04 DJ |
4769 | |
4770 | if (count > 1) | |
4771 | { | |
93ae6fdc | 4772 | errno = 0; |
da6d8c04 | 4773 | buffer[count - 1] |
95954743 | 4774 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4775 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4776 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4777 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4778 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4779 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4780 | if (errno) |
4781 | return errno; | |
da6d8c04 DJ |
4782 | } |
4783 | ||
93ae6fdc | 4784 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4785 | |
493e2a69 MS |
4786 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4787 | myaddr, len); | |
da6d8c04 DJ |
4788 | |
4789 | /* Write the entire buffer. */ | |
4790 | ||
4791 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4792 | { | |
4793 | errno = 0; | |
14ce3065 DE |
4794 | ptrace (PTRACE_POKETEXT, pid, |
4795 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4796 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4797 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4798 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4799 | if (errno) |
4800 | return errno; | |
4801 | } | |
4802 | ||
4803 | return 0; | |
4804 | } | |
2f2893d9 DJ |
4805 | |
4806 | static void | |
4807 | linux_look_up_symbols (void) | |
4808 | { | |
0d62e5e8 | 4809 | #ifdef USE_THREAD_DB |
95954743 PA |
4810 | struct process_info *proc = current_process (); |
4811 | ||
cdbfd419 | 4812 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4813 | return; |
4814 | ||
96d7229d LM |
4815 | /* If the kernel supports tracing clones, then we don't need to |
4816 | use the magic thread event breakpoint to learn about | |
4817 | threads. */ | |
4818 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4819 | #endif |
4820 | } | |
4821 | ||
e5379b03 | 4822 | static void |
ef57601b | 4823 | linux_request_interrupt (void) |
e5379b03 | 4824 | { |
a1928bad | 4825 | extern unsigned long signal_pid; |
e5379b03 | 4826 | |
78708b7c PA |
4827 | /* Send a SIGINT to the process group. This acts just like the user |
4828 | typed a ^C on the controlling terminal. */ | |
4829 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
4830 | } |
4831 | ||
aa691b87 RM |
4832 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4833 | to debugger memory starting at MYADDR. */ | |
4834 | ||
4835 | static int | |
f450004a | 4836 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4837 | { |
4838 | char filename[PATH_MAX]; | |
4839 | int fd, n; | |
0bfdf32f | 4840 | int pid = lwpid_of (current_thread); |
aa691b87 | 4841 | |
6cebaf6e | 4842 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4843 | |
4844 | fd = open (filename, O_RDONLY); | |
4845 | if (fd < 0) | |
4846 | return -1; | |
4847 | ||
4848 | if (offset != (CORE_ADDR) 0 | |
4849 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4850 | n = -1; | |
4851 | else | |
4852 | n = read (fd, myaddr, len); | |
4853 | ||
4854 | close (fd); | |
4855 | ||
4856 | return n; | |
4857 | } | |
4858 | ||
d993e290 PA |
4859 | /* These breakpoint and watchpoint related wrapper functions simply |
4860 | pass on the function call if the target has registered a | |
4861 | corresponding function. */ | |
e013ee27 OF |
4862 | |
4863 | static int | |
802e8e6d PA |
4864 | linux_supports_z_point_type (char z_type) |
4865 | { | |
4866 | return (the_low_target.supports_z_point_type != NULL | |
4867 | && the_low_target.supports_z_point_type (z_type)); | |
4868 | } | |
4869 | ||
4870 | static int | |
4871 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4872 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4873 | { |
d993e290 | 4874 | if (the_low_target.insert_point != NULL) |
802e8e6d | 4875 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
4876 | else |
4877 | /* Unsupported (see target.h). */ | |
4878 | return 1; | |
4879 | } | |
4880 | ||
4881 | static int | |
802e8e6d PA |
4882 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
4883 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4884 | { |
d993e290 | 4885 | if (the_low_target.remove_point != NULL) |
802e8e6d | 4886 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
4887 | else |
4888 | /* Unsupported (see target.h). */ | |
4889 | return 1; | |
4890 | } | |
4891 | ||
4892 | static int | |
4893 | linux_stopped_by_watchpoint (void) | |
4894 | { | |
0bfdf32f | 4895 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 4896 | |
582511be | 4897 | return lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
4898 | } |
4899 | ||
4900 | static CORE_ADDR | |
4901 | linux_stopped_data_address (void) | |
4902 | { | |
0bfdf32f | 4903 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
4904 | |
4905 | return lwp->stopped_data_address; | |
e013ee27 OF |
4906 | } |
4907 | ||
db0dfaa0 LM |
4908 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4909 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4910 | && defined(PT_TEXT_END_ADDR) | |
4911 | ||
4912 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4913 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4914 | the target has different ways of acquiring this information, like | |
4915 | loadmaps. */ | |
52fb6437 NS |
4916 | |
4917 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4918 | to tell gdb about. */ | |
4919 | ||
4920 | static int | |
4921 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4922 | { | |
52fb6437 | 4923 | unsigned long text, text_end, data; |
0bfdf32f | 4924 | int pid = lwpid_of (get_thread_lwp (current_thread)); |
52fb6437 NS |
4925 | |
4926 | errno = 0; | |
4927 | ||
b8e1b30e LM |
4928 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4929 | (PTRACE_TYPE_ARG4) 0); | |
4930 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4931 | (PTRACE_TYPE_ARG4) 0); | |
4932 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4933 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4934 | |
4935 | if (errno == 0) | |
4936 | { | |
4937 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4938 | used by gdb) are relative to the beginning of the program, |
4939 | with the data segment immediately following the text segment. | |
4940 | However, the actual runtime layout in memory may put the data | |
4941 | somewhere else, so when we send gdb a data base-address, we | |
4942 | use the real data base address and subtract the compile-time | |
4943 | data base-address from it (which is just the length of the | |
4944 | text segment). BSS immediately follows data in both | |
4945 | cases. */ | |
52fb6437 NS |
4946 | *text_p = text; |
4947 | *data_p = data - (text_end - text); | |
1b3f6016 | 4948 | |
52fb6437 NS |
4949 | return 1; |
4950 | } | |
52fb6437 NS |
4951 | return 0; |
4952 | } | |
4953 | #endif | |
4954 | ||
07e059b5 VP |
4955 | static int |
4956 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4957 | unsigned char *readbuf, unsigned const char *writebuf, |
4958 | CORE_ADDR offset, int len) | |
07e059b5 | 4959 | { |
d26e3629 | 4960 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4961 | } |
4962 | ||
d0722149 DE |
4963 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4964 | layout of the inferiors' architecture. */ | |
4965 | ||
4966 | static void | |
a5362b9a | 4967 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4968 | { |
4969 | int done = 0; | |
4970 | ||
4971 | if (the_low_target.siginfo_fixup != NULL) | |
4972 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4973 | ||
4974 | /* If there was no callback, or the callback didn't do anything, | |
4975 | then just do a straight memcpy. */ | |
4976 | if (!done) | |
4977 | { | |
4978 | if (direction == 1) | |
a5362b9a | 4979 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4980 | else |
a5362b9a | 4981 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4982 | } |
4983 | } | |
4984 | ||
4aa995e1 PA |
4985 | static int |
4986 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4987 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4988 | { | |
d0722149 | 4989 | int pid; |
a5362b9a TS |
4990 | siginfo_t siginfo; |
4991 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 4992 | |
0bfdf32f | 4993 | if (current_thread == NULL) |
4aa995e1 PA |
4994 | return -1; |
4995 | ||
0bfdf32f | 4996 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
4997 | |
4998 | if (debug_threads) | |
87ce2a04 DE |
4999 | debug_printf ("%s siginfo for lwp %d.\n", |
5000 | readbuf != NULL ? "Reading" : "Writing", | |
5001 | pid); | |
4aa995e1 | 5002 | |
0adea5f7 | 5003 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5004 | return -1; |
5005 | ||
b8e1b30e | 5006 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5007 | return -1; |
5008 | ||
d0722149 DE |
5009 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5010 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5011 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5012 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5013 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5014 | ||
4aa995e1 PA |
5015 | if (offset + len > sizeof (siginfo)) |
5016 | len = sizeof (siginfo) - offset; | |
5017 | ||
5018 | if (readbuf != NULL) | |
d0722149 | 5019 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5020 | else |
5021 | { | |
d0722149 DE |
5022 | memcpy (inf_siginfo + offset, writebuf, len); |
5023 | ||
5024 | /* Convert back to ptrace layout before flushing it out. */ | |
5025 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5026 | ||
b8e1b30e | 5027 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5028 | return -1; |
5029 | } | |
5030 | ||
5031 | return len; | |
5032 | } | |
5033 | ||
bd99dc85 PA |
5034 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5035 | so we notice when children change state; as the handler for the | |
5036 | sigsuspend in my_waitpid. */ | |
5037 | ||
5038 | static void | |
5039 | sigchld_handler (int signo) | |
5040 | { | |
5041 | int old_errno = errno; | |
5042 | ||
5043 | if (debug_threads) | |
e581f2b4 PA |
5044 | { |
5045 | do | |
5046 | { | |
5047 | /* fprintf is not async-signal-safe, so call write | |
5048 | directly. */ | |
5049 | if (write (2, "sigchld_handler\n", | |
5050 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5051 | break; /* just ignore */ | |
5052 | } while (0); | |
5053 | } | |
bd99dc85 PA |
5054 | |
5055 | if (target_is_async_p ()) | |
5056 | async_file_mark (); /* trigger a linux_wait */ | |
5057 | ||
5058 | errno = old_errno; | |
5059 | } | |
5060 | ||
5061 | static int | |
5062 | linux_supports_non_stop (void) | |
5063 | { | |
5064 | return 1; | |
5065 | } | |
5066 | ||
5067 | static int | |
5068 | linux_async (int enable) | |
5069 | { | |
7089dca4 | 5070 | int previous = target_is_async_p (); |
bd99dc85 | 5071 | |
8336d594 | 5072 | if (debug_threads) |
87ce2a04 DE |
5073 | debug_printf ("linux_async (%d), previous=%d\n", |
5074 | enable, previous); | |
8336d594 | 5075 | |
bd99dc85 PA |
5076 | if (previous != enable) |
5077 | { | |
5078 | sigset_t mask; | |
5079 | sigemptyset (&mask); | |
5080 | sigaddset (&mask, SIGCHLD); | |
5081 | ||
5082 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5083 | ||
5084 | if (enable) | |
5085 | { | |
5086 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5087 | { |
5088 | linux_event_pipe[0] = -1; | |
5089 | linux_event_pipe[1] = -1; | |
5090 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5091 | ||
5092 | warning ("creating event pipe failed."); | |
5093 | return previous; | |
5094 | } | |
bd99dc85 PA |
5095 | |
5096 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5097 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5098 | ||
5099 | /* Register the event loop handler. */ | |
5100 | add_file_handler (linux_event_pipe[0], | |
5101 | handle_target_event, NULL); | |
5102 | ||
5103 | /* Always trigger a linux_wait. */ | |
5104 | async_file_mark (); | |
5105 | } | |
5106 | else | |
5107 | { | |
5108 | delete_file_handler (linux_event_pipe[0]); | |
5109 | ||
5110 | close (linux_event_pipe[0]); | |
5111 | close (linux_event_pipe[1]); | |
5112 | linux_event_pipe[0] = -1; | |
5113 | linux_event_pipe[1] = -1; | |
5114 | } | |
5115 | ||
5116 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5117 | } | |
5118 | ||
5119 | return previous; | |
5120 | } | |
5121 | ||
5122 | static int | |
5123 | linux_start_non_stop (int nonstop) | |
5124 | { | |
5125 | /* Register or unregister from event-loop accordingly. */ | |
5126 | linux_async (nonstop); | |
aa96c426 GB |
5127 | |
5128 | if (target_is_async_p () != (nonstop != 0)) | |
5129 | return -1; | |
5130 | ||
bd99dc85 PA |
5131 | return 0; |
5132 | } | |
5133 | ||
cf8fd78b PA |
5134 | static int |
5135 | linux_supports_multi_process (void) | |
5136 | { | |
5137 | return 1; | |
5138 | } | |
5139 | ||
03583c20 UW |
5140 | static int |
5141 | linux_supports_disable_randomization (void) | |
5142 | { | |
5143 | #ifdef HAVE_PERSONALITY | |
5144 | return 1; | |
5145 | #else | |
5146 | return 0; | |
5147 | #endif | |
5148 | } | |
efcbbd14 | 5149 | |
d1feda86 YQ |
5150 | static int |
5151 | linux_supports_agent (void) | |
5152 | { | |
5153 | return 1; | |
5154 | } | |
5155 | ||
c2d6af84 PA |
5156 | static int |
5157 | linux_supports_range_stepping (void) | |
5158 | { | |
5159 | if (*the_low_target.supports_range_stepping == NULL) | |
5160 | return 0; | |
5161 | ||
5162 | return (*the_low_target.supports_range_stepping) (); | |
5163 | } | |
5164 | ||
efcbbd14 UW |
5165 | /* Enumerate spufs IDs for process PID. */ |
5166 | static int | |
5167 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5168 | { | |
5169 | int pos = 0; | |
5170 | int written = 0; | |
5171 | char path[128]; | |
5172 | DIR *dir; | |
5173 | struct dirent *entry; | |
5174 | ||
5175 | sprintf (path, "/proc/%ld/fd", pid); | |
5176 | dir = opendir (path); | |
5177 | if (!dir) | |
5178 | return -1; | |
5179 | ||
5180 | rewinddir (dir); | |
5181 | while ((entry = readdir (dir)) != NULL) | |
5182 | { | |
5183 | struct stat st; | |
5184 | struct statfs stfs; | |
5185 | int fd; | |
5186 | ||
5187 | fd = atoi (entry->d_name); | |
5188 | if (!fd) | |
5189 | continue; | |
5190 | ||
5191 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5192 | if (stat (path, &st) != 0) | |
5193 | continue; | |
5194 | if (!S_ISDIR (st.st_mode)) | |
5195 | continue; | |
5196 | ||
5197 | if (statfs (path, &stfs) != 0) | |
5198 | continue; | |
5199 | if (stfs.f_type != SPUFS_MAGIC) | |
5200 | continue; | |
5201 | ||
5202 | if (pos >= offset && pos + 4 <= offset + len) | |
5203 | { | |
5204 | *(unsigned int *)(buf + pos - offset) = fd; | |
5205 | written += 4; | |
5206 | } | |
5207 | pos += 4; | |
5208 | } | |
5209 | ||
5210 | closedir (dir); | |
5211 | return written; | |
5212 | } | |
5213 | ||
5214 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5215 | object type, using the /proc file system. */ | |
5216 | static int | |
5217 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5218 | unsigned const char *writebuf, | |
5219 | CORE_ADDR offset, int len) | |
5220 | { | |
0bfdf32f | 5221 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5222 | char buf[128]; |
5223 | int fd = 0; | |
5224 | int ret = 0; | |
5225 | ||
5226 | if (!writebuf && !readbuf) | |
5227 | return -1; | |
5228 | ||
5229 | if (!*annex) | |
5230 | { | |
5231 | if (!readbuf) | |
5232 | return -1; | |
5233 | else | |
5234 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5235 | } | |
5236 | ||
5237 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5238 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5239 | if (fd <= 0) | |
5240 | return -1; | |
5241 | ||
5242 | if (offset != 0 | |
5243 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5244 | { | |
5245 | close (fd); | |
5246 | return 0; | |
5247 | } | |
5248 | ||
5249 | if (writebuf) | |
5250 | ret = write (fd, writebuf, (size_t) len); | |
5251 | else | |
5252 | ret = read (fd, readbuf, (size_t) len); | |
5253 | ||
5254 | close (fd); | |
5255 | return ret; | |
5256 | } | |
5257 | ||
723b724b | 5258 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5259 | struct target_loadseg |
5260 | { | |
5261 | /* Core address to which the segment is mapped. */ | |
5262 | Elf32_Addr addr; | |
5263 | /* VMA recorded in the program header. */ | |
5264 | Elf32_Addr p_vaddr; | |
5265 | /* Size of this segment in memory. */ | |
5266 | Elf32_Word p_memsz; | |
5267 | }; | |
5268 | ||
723b724b | 5269 | # if defined PT_GETDSBT |
78d85199 YQ |
5270 | struct target_loadmap |
5271 | { | |
5272 | /* Protocol version number, must be zero. */ | |
5273 | Elf32_Word version; | |
5274 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5275 | unsigned *dsbt_table; | |
5276 | unsigned dsbt_size, dsbt_index; | |
5277 | /* Number of segments in this map. */ | |
5278 | Elf32_Word nsegs; | |
5279 | /* The actual memory map. */ | |
5280 | struct target_loadseg segs[/*nsegs*/]; | |
5281 | }; | |
723b724b MF |
5282 | # define LINUX_LOADMAP PT_GETDSBT |
5283 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5284 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5285 | # else | |
5286 | struct target_loadmap | |
5287 | { | |
5288 | /* Protocol version number, must be zero. */ | |
5289 | Elf32_Half version; | |
5290 | /* Number of segments in this map. */ | |
5291 | Elf32_Half nsegs; | |
5292 | /* The actual memory map. */ | |
5293 | struct target_loadseg segs[/*nsegs*/]; | |
5294 | }; | |
5295 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5296 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5297 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5298 | # endif | |
78d85199 | 5299 | |
78d85199 YQ |
5300 | static int |
5301 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5302 | unsigned char *myaddr, unsigned int len) | |
5303 | { | |
0bfdf32f | 5304 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5305 | int addr = -1; |
5306 | struct target_loadmap *data = NULL; | |
5307 | unsigned int actual_length, copy_length; | |
5308 | ||
5309 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5310 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5311 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5312 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5313 | else |
5314 | return -1; | |
5315 | ||
723b724b | 5316 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5317 | return -1; |
5318 | ||
5319 | if (data == NULL) | |
5320 | return -1; | |
5321 | ||
5322 | actual_length = sizeof (struct target_loadmap) | |
5323 | + sizeof (struct target_loadseg) * data->nsegs; | |
5324 | ||
5325 | if (offset < 0 || offset > actual_length) | |
5326 | return -1; | |
5327 | ||
5328 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5329 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5330 | return copy_length; | |
5331 | } | |
723b724b MF |
5332 | #else |
5333 | # define linux_read_loadmap NULL | |
5334 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5335 | |
1570b33e L |
5336 | static void |
5337 | linux_process_qsupported (const char *query) | |
5338 | { | |
5339 | if (the_low_target.process_qsupported != NULL) | |
5340 | the_low_target.process_qsupported (query); | |
5341 | } | |
5342 | ||
219f2f23 PA |
5343 | static int |
5344 | linux_supports_tracepoints (void) | |
5345 | { | |
5346 | if (*the_low_target.supports_tracepoints == NULL) | |
5347 | return 0; | |
5348 | ||
5349 | return (*the_low_target.supports_tracepoints) (); | |
5350 | } | |
5351 | ||
5352 | static CORE_ADDR | |
5353 | linux_read_pc (struct regcache *regcache) | |
5354 | { | |
5355 | if (the_low_target.get_pc == NULL) | |
5356 | return 0; | |
5357 | ||
5358 | return (*the_low_target.get_pc) (regcache); | |
5359 | } | |
5360 | ||
5361 | static void | |
5362 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5363 | { | |
5364 | gdb_assert (the_low_target.set_pc != NULL); | |
5365 | ||
5366 | (*the_low_target.set_pc) (regcache, pc); | |
5367 | } | |
5368 | ||
8336d594 PA |
5369 | static int |
5370 | linux_thread_stopped (struct thread_info *thread) | |
5371 | { | |
5372 | return get_thread_lwp (thread)->stopped; | |
5373 | } | |
5374 | ||
5375 | /* This exposes stop-all-threads functionality to other modules. */ | |
5376 | ||
5377 | static void | |
7984d532 | 5378 | linux_pause_all (int freeze) |
8336d594 | 5379 | { |
7984d532 PA |
5380 | stop_all_lwps (freeze, NULL); |
5381 | } | |
5382 | ||
5383 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5384 | modules. */ | |
5385 | ||
5386 | static void | |
5387 | linux_unpause_all (int unfreeze) | |
5388 | { | |
5389 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5390 | } |
5391 | ||
90d74c30 PA |
5392 | static int |
5393 | linux_prepare_to_access_memory (void) | |
5394 | { | |
5395 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5396 | running LWP. */ | |
5397 | if (non_stop) | |
5398 | linux_pause_all (1); | |
5399 | return 0; | |
5400 | } | |
5401 | ||
5402 | static void | |
0146f85b | 5403 | linux_done_accessing_memory (void) |
90d74c30 PA |
5404 | { |
5405 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5406 | running LWP. */ | |
5407 | if (non_stop) | |
5408 | linux_unpause_all (1); | |
5409 | } | |
5410 | ||
fa593d66 PA |
5411 | static int |
5412 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5413 | CORE_ADDR collector, | |
5414 | CORE_ADDR lockaddr, | |
5415 | ULONGEST orig_size, | |
5416 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5417 | CORE_ADDR *trampoline, |
5418 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5419 | unsigned char *jjump_pad_insn, |
5420 | ULONGEST *jjump_pad_insn_size, | |
5421 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5422 | CORE_ADDR *adjusted_insn_addr_end, |
5423 | char *err) | |
fa593d66 PA |
5424 | { |
5425 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5426 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5427 | jump_entry, trampoline, trampoline_size, |
5428 | jjump_pad_insn, jjump_pad_insn_size, | |
5429 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5430 | err); | |
fa593d66 PA |
5431 | } |
5432 | ||
6a271cae PA |
5433 | static struct emit_ops * |
5434 | linux_emit_ops (void) | |
5435 | { | |
5436 | if (the_low_target.emit_ops != NULL) | |
5437 | return (*the_low_target.emit_ops) (); | |
5438 | else | |
5439 | return NULL; | |
5440 | } | |
5441 | ||
405f8e94 SS |
5442 | static int |
5443 | linux_get_min_fast_tracepoint_insn_len (void) | |
5444 | { | |
5445 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5446 | } | |
5447 | ||
2268b414 JK |
5448 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5449 | ||
5450 | static int | |
5451 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5452 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5453 | { | |
5454 | char filename[PATH_MAX]; | |
5455 | int fd; | |
5456 | const int auxv_size = is_elf64 | |
5457 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5458 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5459 | ||
5460 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5461 | ||
5462 | fd = open (filename, O_RDONLY); | |
5463 | if (fd < 0) | |
5464 | return 1; | |
5465 | ||
5466 | *phdr_memaddr = 0; | |
5467 | *num_phdr = 0; | |
5468 | while (read (fd, buf, auxv_size) == auxv_size | |
5469 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5470 | { | |
5471 | if (is_elf64) | |
5472 | { | |
5473 | Elf64_auxv_t *const aux = (Elf64_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 | else | |
5486 | { | |
5487 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5488 | ||
5489 | switch (aux->a_type) | |
5490 | { | |
5491 | case AT_PHDR: | |
5492 | *phdr_memaddr = aux->a_un.a_val; | |
5493 | break; | |
5494 | case AT_PHNUM: | |
5495 | *num_phdr = aux->a_un.a_val; | |
5496 | break; | |
5497 | } | |
5498 | } | |
5499 | } | |
5500 | ||
5501 | close (fd); | |
5502 | ||
5503 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5504 | { | |
5505 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5506 | "phdr_memaddr = %ld, phdr_num = %d", | |
5507 | (long) *phdr_memaddr, *num_phdr); | |
5508 | return 2; | |
5509 | } | |
5510 | ||
5511 | return 0; | |
5512 | } | |
5513 | ||
5514 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5515 | ||
5516 | static CORE_ADDR | |
5517 | get_dynamic (const int pid, const int is_elf64) | |
5518 | { | |
5519 | CORE_ADDR phdr_memaddr, relocation; | |
5520 | int num_phdr, i; | |
5521 | unsigned char *phdr_buf; | |
5522 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5523 | ||
5524 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5525 | return 0; | |
5526 | ||
5527 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5528 | phdr_buf = alloca (num_phdr * phdr_size); | |
5529 | ||
5530 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5531 | return 0; | |
5532 | ||
5533 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5534 | non-zero for PIE ones. */ | |
5535 | relocation = -1; | |
5536 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5537 | if (is_elf64) | |
5538 | { | |
5539 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5540 | ||
5541 | if (p->p_type == PT_PHDR) | |
5542 | relocation = phdr_memaddr - p->p_vaddr; | |
5543 | } | |
5544 | else | |
5545 | { | |
5546 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5547 | ||
5548 | if (p->p_type == PT_PHDR) | |
5549 | relocation = phdr_memaddr - p->p_vaddr; | |
5550 | } | |
5551 | ||
5552 | if (relocation == -1) | |
5553 | { | |
e237a7e2 JK |
5554 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5555 | any real world executables, including PIE executables, have always | |
5556 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5557 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5558 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5559 | ||
5560 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5561 | ||
5562 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5563 | ||
2268b414 JK |
5564 | return 0; |
5565 | } | |
5566 | ||
5567 | for (i = 0; i < num_phdr; i++) | |
5568 | { | |
5569 | if (is_elf64) | |
5570 | { | |
5571 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5572 | ||
5573 | if (p->p_type == PT_DYNAMIC) | |
5574 | return p->p_vaddr + relocation; | |
5575 | } | |
5576 | else | |
5577 | { | |
5578 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5579 | ||
5580 | if (p->p_type == PT_DYNAMIC) | |
5581 | return p->p_vaddr + relocation; | |
5582 | } | |
5583 | } | |
5584 | ||
5585 | return 0; | |
5586 | } | |
5587 | ||
5588 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5589 | can be 0 if the inferior does not yet have the library list initialized. |
5590 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5591 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5592 | |
5593 | static CORE_ADDR | |
5594 | get_r_debug (const int pid, const int is_elf64) | |
5595 | { | |
5596 | CORE_ADDR dynamic_memaddr; | |
5597 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5598 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5599 | CORE_ADDR map = -1; |
2268b414 JK |
5600 | |
5601 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5602 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5603 | return map; |
2268b414 JK |
5604 | |
5605 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5606 | { | |
5607 | if (is_elf64) | |
5608 | { | |
5609 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5610 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5611 | union |
5612 | { | |
5613 | Elf64_Xword map; | |
5614 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5615 | } | |
5616 | rld_map; | |
5617 | ||
5618 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5619 | { | |
5620 | if (linux_read_memory (dyn->d_un.d_val, | |
5621 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5622 | return rld_map.map; | |
5623 | else | |
5624 | break; | |
5625 | } | |
75f62ce7 | 5626 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5627 | |
367ba2c2 MR |
5628 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5629 | map = dyn->d_un.d_val; | |
2268b414 JK |
5630 | |
5631 | if (dyn->d_tag == DT_NULL) | |
5632 | break; | |
5633 | } | |
5634 | else | |
5635 | { | |
5636 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5637 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5638 | union |
5639 | { | |
5640 | Elf32_Word map; | |
5641 | unsigned char buf[sizeof (Elf32_Word)]; | |
5642 | } | |
5643 | rld_map; | |
5644 | ||
5645 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5646 | { | |
5647 | if (linux_read_memory (dyn->d_un.d_val, | |
5648 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5649 | return rld_map.map; | |
5650 | else | |
5651 | break; | |
5652 | } | |
75f62ce7 | 5653 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5654 | |
367ba2c2 MR |
5655 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5656 | map = dyn->d_un.d_val; | |
2268b414 JK |
5657 | |
5658 | if (dyn->d_tag == DT_NULL) | |
5659 | break; | |
5660 | } | |
5661 | ||
5662 | dynamic_memaddr += dyn_size; | |
5663 | } | |
5664 | ||
367ba2c2 | 5665 | return map; |
2268b414 JK |
5666 | } |
5667 | ||
5668 | /* Read one pointer from MEMADDR in the inferior. */ | |
5669 | ||
5670 | static int | |
5671 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5672 | { | |
485f1ee4 PA |
5673 | int ret; |
5674 | ||
5675 | /* Go through a union so this works on either big or little endian | |
5676 | hosts, when the inferior's pointer size is smaller than the size | |
5677 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5678 | same of the superior's. */ | |
5679 | union | |
5680 | { | |
5681 | CORE_ADDR core_addr; | |
5682 | unsigned int ui; | |
5683 | unsigned char uc; | |
5684 | } addr; | |
5685 | ||
5686 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5687 | if (ret == 0) | |
5688 | { | |
5689 | if (ptr_size == sizeof (CORE_ADDR)) | |
5690 | *ptr = addr.core_addr; | |
5691 | else if (ptr_size == sizeof (unsigned int)) | |
5692 | *ptr = addr.ui; | |
5693 | else | |
5694 | gdb_assert_not_reached ("unhandled pointer size"); | |
5695 | } | |
5696 | return ret; | |
2268b414 JK |
5697 | } |
5698 | ||
5699 | struct link_map_offsets | |
5700 | { | |
5701 | /* Offset and size of r_debug.r_version. */ | |
5702 | int r_version_offset; | |
5703 | ||
5704 | /* Offset and size of r_debug.r_map. */ | |
5705 | int r_map_offset; | |
5706 | ||
5707 | /* Offset to l_addr field in struct link_map. */ | |
5708 | int l_addr_offset; | |
5709 | ||
5710 | /* Offset to l_name field in struct link_map. */ | |
5711 | int l_name_offset; | |
5712 | ||
5713 | /* Offset to l_ld field in struct link_map. */ | |
5714 | int l_ld_offset; | |
5715 | ||
5716 | /* Offset to l_next field in struct link_map. */ | |
5717 | int l_next_offset; | |
5718 | ||
5719 | /* Offset to l_prev field in struct link_map. */ | |
5720 | int l_prev_offset; | |
5721 | }; | |
5722 | ||
fb723180 | 5723 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5724 | |
5725 | static int | |
5726 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5727 | unsigned const char *writebuf, | |
5728 | CORE_ADDR offset, int len) | |
5729 | { | |
5730 | char *document; | |
5731 | unsigned document_len; | |
5732 | struct process_info_private *const priv = current_process ()->private; | |
5733 | char filename[PATH_MAX]; | |
5734 | int pid, is_elf64; | |
5735 | ||
5736 | static const struct link_map_offsets lmo_32bit_offsets = | |
5737 | { | |
5738 | 0, /* r_version offset. */ | |
5739 | 4, /* r_debug.r_map offset. */ | |
5740 | 0, /* l_addr offset in link_map. */ | |
5741 | 4, /* l_name offset in link_map. */ | |
5742 | 8, /* l_ld offset in link_map. */ | |
5743 | 12, /* l_next offset in link_map. */ | |
5744 | 16 /* l_prev offset in link_map. */ | |
5745 | }; | |
5746 | ||
5747 | static const struct link_map_offsets lmo_64bit_offsets = | |
5748 | { | |
5749 | 0, /* r_version offset. */ | |
5750 | 8, /* r_debug.r_map offset. */ | |
5751 | 0, /* l_addr offset in link_map. */ | |
5752 | 8, /* l_name offset in link_map. */ | |
5753 | 16, /* l_ld offset in link_map. */ | |
5754 | 24, /* l_next offset in link_map. */ | |
5755 | 32 /* l_prev offset in link_map. */ | |
5756 | }; | |
5757 | const struct link_map_offsets *lmo; | |
214d508e | 5758 | unsigned int machine; |
b1fbec62 GB |
5759 | int ptr_size; |
5760 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5761 | int allocated = 1024; | |
5762 | char *p; | |
5763 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5764 | int header_done = 0; | |
2268b414 JK |
5765 | |
5766 | if (writebuf != NULL) | |
5767 | return -2; | |
5768 | if (readbuf == NULL) | |
5769 | return -1; | |
5770 | ||
0bfdf32f | 5771 | pid = lwpid_of (current_thread); |
2268b414 | 5772 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5773 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5774 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5775 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5776 | |
b1fbec62 GB |
5777 | while (annex[0] != '\0') |
5778 | { | |
5779 | const char *sep; | |
5780 | CORE_ADDR *addrp; | |
5781 | int len; | |
2268b414 | 5782 | |
b1fbec62 GB |
5783 | sep = strchr (annex, '='); |
5784 | if (sep == NULL) | |
5785 | break; | |
0c5bf5a9 | 5786 | |
b1fbec62 GB |
5787 | len = sep - annex; |
5788 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5789 | addrp = &lm_addr; | |
5790 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5791 | addrp = &lm_prev; | |
5792 | else | |
5793 | { | |
5794 | annex = strchr (sep, ';'); | |
5795 | if (annex == NULL) | |
5796 | break; | |
5797 | annex++; | |
5798 | continue; | |
5799 | } | |
5800 | ||
5801 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5802 | } |
b1fbec62 GB |
5803 | |
5804 | if (lm_addr == 0) | |
2268b414 | 5805 | { |
b1fbec62 GB |
5806 | int r_version = 0; |
5807 | ||
5808 | if (priv->r_debug == 0) | |
5809 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5810 | ||
5811 | /* We failed to find DT_DEBUG. Such situation will not change | |
5812 | for this inferior - do not retry it. Report it to GDB as | |
5813 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5814 | if (priv->r_debug == (CORE_ADDR) -1) | |
5815 | return -1; | |
5816 | ||
5817 | if (priv->r_debug != 0) | |
2268b414 | 5818 | { |
b1fbec62 GB |
5819 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5820 | (unsigned char *) &r_version, | |
5821 | sizeof (r_version)) != 0 | |
5822 | || r_version != 1) | |
5823 | { | |
5824 | warning ("unexpected r_debug version %d", r_version); | |
5825 | } | |
5826 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5827 | &lm_addr, ptr_size) != 0) | |
5828 | { | |
5829 | warning ("unable to read r_map from 0x%lx", | |
5830 | (long) priv->r_debug + lmo->r_map_offset); | |
5831 | } | |
2268b414 | 5832 | } |
b1fbec62 | 5833 | } |
2268b414 | 5834 | |
b1fbec62 GB |
5835 | document = xmalloc (allocated); |
5836 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5837 | p = document + strlen (document); | |
5838 | ||
5839 | while (lm_addr | |
5840 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5841 | &l_name, ptr_size) == 0 | |
5842 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5843 | &l_addr, ptr_size) == 0 | |
5844 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5845 | &l_ld, ptr_size) == 0 | |
5846 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5847 | &l_prev, ptr_size) == 0 | |
5848 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5849 | &l_next, ptr_size) == 0) | |
5850 | { | |
5851 | unsigned char libname[PATH_MAX]; | |
5852 | ||
5853 | if (lm_prev != l_prev) | |
2268b414 | 5854 | { |
b1fbec62 GB |
5855 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5856 | (long) lm_prev, (long) l_prev); | |
5857 | break; | |
2268b414 JK |
5858 | } |
5859 | ||
d878444c JK |
5860 | /* Ignore the first entry even if it has valid name as the first entry |
5861 | corresponds to the main executable. The first entry should not be | |
5862 | skipped if the dynamic loader was loaded late by a static executable | |
5863 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5864 | executable does not have PT_DYNAMIC present and this function already | |
5865 | exited above due to failed get_r_debug. */ | |
5866 | if (lm_prev == 0) | |
2268b414 | 5867 | { |
d878444c JK |
5868 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5869 | p = p + strlen (p); | |
5870 | } | |
5871 | else | |
5872 | { | |
5873 | /* Not checking for error because reading may stop before | |
5874 | we've got PATH_MAX worth of characters. */ | |
5875 | libname[0] = '\0'; | |
5876 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5877 | libname[sizeof (libname) - 1] = '\0'; | |
5878 | if (libname[0] != '\0') | |
2268b414 | 5879 | { |
d878444c JK |
5880 | /* 6x the size for xml_escape_text below. */ |
5881 | size_t len = 6 * strlen ((char *) libname); | |
5882 | char *name; | |
2268b414 | 5883 | |
d878444c JK |
5884 | if (!header_done) |
5885 | { | |
5886 | /* Terminate `<library-list-svr4'. */ | |
5887 | *p++ = '>'; | |
5888 | header_done = 1; | |
5889 | } | |
2268b414 | 5890 | |
d878444c JK |
5891 | while (allocated < p - document + len + 200) |
5892 | { | |
5893 | /* Expand to guarantee sufficient storage. */ | |
5894 | uintptr_t document_len = p - document; | |
2268b414 | 5895 | |
d878444c JK |
5896 | document = xrealloc (document, 2 * allocated); |
5897 | allocated *= 2; | |
5898 | p = document + document_len; | |
5899 | } | |
5900 | ||
5901 | name = xml_escape_text ((char *) libname); | |
5902 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5903 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5904 | name, (unsigned long) lm_addr, | |
5905 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5906 | free (name); | |
5907 | } | |
0afae3cf | 5908 | } |
b1fbec62 GB |
5909 | |
5910 | lm_prev = lm_addr; | |
5911 | lm_addr = l_next; | |
2268b414 JK |
5912 | } |
5913 | ||
b1fbec62 GB |
5914 | if (!header_done) |
5915 | { | |
5916 | /* Empty list; terminate `<library-list-svr4'. */ | |
5917 | strcpy (p, "/>"); | |
5918 | } | |
5919 | else | |
5920 | strcpy (p, "</library-list-svr4>"); | |
5921 | ||
2268b414 JK |
5922 | document_len = strlen (document); |
5923 | if (offset < document_len) | |
5924 | document_len -= offset; | |
5925 | else | |
5926 | document_len = 0; | |
5927 | if (len > document_len) | |
5928 | len = document_len; | |
5929 | ||
5930 | memcpy (readbuf, document + offset, len); | |
5931 | xfree (document); | |
5932 | ||
5933 | return len; | |
5934 | } | |
5935 | ||
9accd112 MM |
5936 | #ifdef HAVE_LINUX_BTRACE |
5937 | ||
969c39fb | 5938 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5939 | |
5940 | static struct btrace_target_info * | |
5941 | linux_low_enable_btrace (ptid_t ptid) | |
5942 | { | |
5943 | struct btrace_target_info *tinfo; | |
5944 | ||
5945 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5946 | |
9accd112 | 5947 | if (tinfo != NULL) |
3aee8918 PA |
5948 | { |
5949 | struct thread_info *thread = find_thread_ptid (ptid); | |
5950 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5951 | ||
5952 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5953 | } | |
9accd112 MM |
5954 | |
5955 | return tinfo; | |
5956 | } | |
5957 | ||
969c39fb | 5958 | /* See to_disable_btrace target method. */ |
9accd112 | 5959 | |
969c39fb MM |
5960 | static int |
5961 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5962 | { | |
5963 | enum btrace_error err; | |
5964 | ||
5965 | err = linux_disable_btrace (tinfo); | |
5966 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5967 | } | |
5968 | ||
5969 | /* See to_read_btrace target method. */ | |
5970 | ||
5971 | static int | |
9accd112 MM |
5972 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5973 | int type) | |
5974 | { | |
734b0e4b | 5975 | struct btrace_data btrace; |
9accd112 | 5976 | struct btrace_block *block; |
969c39fb | 5977 | enum btrace_error err; |
9accd112 MM |
5978 | int i; |
5979 | ||
734b0e4b MM |
5980 | btrace_data_init (&btrace); |
5981 | ||
969c39fb MM |
5982 | err = linux_read_btrace (&btrace, tinfo, type); |
5983 | if (err != BTRACE_ERR_NONE) | |
5984 | { | |
5985 | if (err == BTRACE_ERR_OVERFLOW) | |
5986 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5987 | else | |
5988 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5989 | ||
734b0e4b | 5990 | btrace_data_fini (&btrace); |
969c39fb MM |
5991 | return -1; |
5992 | } | |
9accd112 | 5993 | |
734b0e4b MM |
5994 | switch (btrace.format) |
5995 | { | |
5996 | case BTRACE_FORMAT_NONE: | |
5997 | buffer_grow_str0 (buffer, "E.No Trace."); | |
5998 | break; | |
5999 | ||
6000 | case BTRACE_FORMAT_BTS: | |
6001 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6002 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6003 | |
734b0e4b MM |
6004 | for (i = 0; |
6005 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6006 | i++) | |
6007 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6008 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6009 | |
734b0e4b MM |
6010 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6011 | break; | |
6012 | ||
6013 | default: | |
6014 | buffer_grow_str0 (buffer, "E.Unknown Trace Format."); | |
9accd112 | 6015 | |
734b0e4b MM |
6016 | btrace_data_fini (&btrace); |
6017 | return -1; | |
6018 | } | |
969c39fb | 6019 | |
734b0e4b | 6020 | btrace_data_fini (&btrace); |
969c39fb | 6021 | return 0; |
9accd112 MM |
6022 | } |
6023 | #endif /* HAVE_LINUX_BTRACE */ | |
6024 | ||
ce3a066d DJ |
6025 | static struct target_ops linux_target_ops = { |
6026 | linux_create_inferior, | |
6027 | linux_attach, | |
6028 | linux_kill, | |
6ad8ae5c | 6029 | linux_detach, |
8336d594 | 6030 | linux_mourn, |
444d6139 | 6031 | linux_join, |
ce3a066d DJ |
6032 | linux_thread_alive, |
6033 | linux_resume, | |
6034 | linux_wait, | |
6035 | linux_fetch_registers, | |
6036 | linux_store_registers, | |
90d74c30 | 6037 | linux_prepare_to_access_memory, |
0146f85b | 6038 | linux_done_accessing_memory, |
ce3a066d DJ |
6039 | linux_read_memory, |
6040 | linux_write_memory, | |
2f2893d9 | 6041 | linux_look_up_symbols, |
ef57601b | 6042 | linux_request_interrupt, |
aa691b87 | 6043 | linux_read_auxv, |
802e8e6d | 6044 | linux_supports_z_point_type, |
d993e290 PA |
6045 | linux_insert_point, |
6046 | linux_remove_point, | |
e013ee27 OF |
6047 | linux_stopped_by_watchpoint, |
6048 | linux_stopped_data_address, | |
db0dfaa0 LM |
6049 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6050 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6051 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6052 | linux_read_offsets, |
dae5f5cf DJ |
6053 | #else |
6054 | NULL, | |
6055 | #endif | |
6056 | #ifdef USE_THREAD_DB | |
6057 | thread_db_get_tls_address, | |
6058 | #else | |
6059 | NULL, | |
52fb6437 | 6060 | #endif |
efcbbd14 | 6061 | linux_qxfer_spu, |
59a016f0 | 6062 | hostio_last_error_from_errno, |
07e059b5 | 6063 | linux_qxfer_osdata, |
4aa995e1 | 6064 | linux_xfer_siginfo, |
bd99dc85 PA |
6065 | linux_supports_non_stop, |
6066 | linux_async, | |
6067 | linux_start_non_stop, | |
cdbfd419 PP |
6068 | linux_supports_multi_process, |
6069 | #ifdef USE_THREAD_DB | |
dc146f7c | 6070 | thread_db_handle_monitor_command, |
cdbfd419 | 6071 | #else |
dc146f7c | 6072 | NULL, |
cdbfd419 | 6073 | #endif |
d26e3629 | 6074 | linux_common_core_of_thread, |
78d85199 | 6075 | linux_read_loadmap, |
219f2f23 PA |
6076 | linux_process_qsupported, |
6077 | linux_supports_tracepoints, | |
6078 | linux_read_pc, | |
8336d594 PA |
6079 | linux_write_pc, |
6080 | linux_thread_stopped, | |
7984d532 | 6081 | NULL, |
711e434b | 6082 | linux_pause_all, |
7984d532 | 6083 | linux_unpause_all, |
fa593d66 | 6084 | linux_stabilize_threads, |
6a271cae | 6085 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6086 | linux_emit_ops, |
6087 | linux_supports_disable_randomization, | |
405f8e94 | 6088 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6089 | linux_qxfer_libraries_svr4, |
d1feda86 | 6090 | linux_supports_agent, |
9accd112 MM |
6091 | #ifdef HAVE_LINUX_BTRACE |
6092 | linux_supports_btrace, | |
6093 | linux_low_enable_btrace, | |
969c39fb | 6094 | linux_low_disable_btrace, |
9accd112 MM |
6095 | linux_low_read_btrace, |
6096 | #else | |
6097 | NULL, | |
6098 | NULL, | |
6099 | NULL, | |
6100 | NULL, | |
9accd112 | 6101 | #endif |
c2d6af84 | 6102 | linux_supports_range_stepping, |
ce3a066d DJ |
6103 | }; |
6104 | ||
0d62e5e8 DJ |
6105 | static void |
6106 | linux_init_signals () | |
6107 | { | |
6108 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6109 | to find what the cancel signal actually is. */ | |
1a981360 | 6110 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6111 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6112 | #endif |
0d62e5e8 DJ |
6113 | } |
6114 | ||
3aee8918 PA |
6115 | #ifdef HAVE_LINUX_REGSETS |
6116 | void | |
6117 | initialize_regsets_info (struct regsets_info *info) | |
6118 | { | |
6119 | for (info->num_regsets = 0; | |
6120 | info->regsets[info->num_regsets].size >= 0; | |
6121 | info->num_regsets++) | |
6122 | ; | |
3aee8918 PA |
6123 | } |
6124 | #endif | |
6125 | ||
da6d8c04 DJ |
6126 | void |
6127 | initialize_low (void) | |
6128 | { | |
bd99dc85 PA |
6129 | struct sigaction sigchld_action; |
6130 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6131 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6132 | set_breakpoint_data (the_low_target.breakpoint, |
6133 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6134 | linux_init_signals (); |
aa7c7447 | 6135 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6136 | |
6137 | sigchld_action.sa_handler = sigchld_handler; | |
6138 | sigemptyset (&sigchld_action.sa_mask); | |
6139 | sigchld_action.sa_flags = SA_RESTART; | |
6140 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6141 | |
6142 | initialize_low_arch (); | |
da6d8c04 | 6143 | } |