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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 | |
8090aef2 PA |
510 | case we need to report the breakpoint PC. */ |
511 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
512 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
513 | { | |
514 | if (debug_threads) | |
515 | { | |
516 | struct thread_info *thr = get_lwp_thread (lwp); | |
517 | ||
518 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
519 | target_pid_to_str (ptid_of (thr))); | |
520 | } | |
521 | ||
522 | /* Back up the PC if necessary. */ | |
523 | if (pc != sw_breakpoint_pc) | |
524 | { | |
525 | struct regcache *regcache | |
526 | = get_thread_regcache (current_thread, 1); | |
527 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
528 | } | |
529 | ||
530 | lwp->stop_pc = sw_breakpoint_pc; | |
531 | lwp->stop_reason = LWP_STOPPED_BY_SW_BREAKPOINT; | |
532 | current_thread = saved_thread; | |
533 | return 1; | |
534 | } | |
535 | ||
536 | if (hardware_breakpoint_inserted_here (pc)) | |
537 | { | |
538 | if (debug_threads) | |
539 | { | |
540 | struct thread_info *thr = get_lwp_thread (lwp); | |
541 | ||
542 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
543 | target_pid_to_str (ptid_of (thr))); | |
544 | } | |
47c0c975 | 545 | |
582511be PA |
546 | lwp->stop_pc = pc; |
547 | lwp->stop_reason = LWP_STOPPED_BY_HW_BREAKPOINT; | |
548 | current_thread = saved_thread; | |
549 | return 1; | |
550 | } | |
551 | ||
552 | current_thread = saved_thread; | |
553 | return 0; | |
0d62e5e8 | 554 | } |
ce3a066d | 555 | |
b3312d80 | 556 | static struct lwp_info * |
95954743 | 557 | add_lwp (ptid_t ptid) |
611cb4a5 | 558 | { |
54a0b537 | 559 | struct lwp_info *lwp; |
0d62e5e8 | 560 | |
54a0b537 PA |
561 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
562 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 563 | |
aa5ca48f DE |
564 | if (the_low_target.new_thread != NULL) |
565 | lwp->arch_private = the_low_target.new_thread (); | |
566 | ||
f7667f0d | 567 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 568 | |
54a0b537 | 569 | return lwp; |
0d62e5e8 | 570 | } |
611cb4a5 | 571 | |
da6d8c04 DJ |
572 | /* Start an inferior process and returns its pid. |
573 | ALLARGS is a vector of program-name and args. */ | |
574 | ||
ce3a066d DJ |
575 | static int |
576 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 577 | { |
a6dbe5df | 578 | struct lwp_info *new_lwp; |
da6d8c04 | 579 | int pid; |
95954743 | 580 | ptid_t ptid; |
8cc73a39 SDJ |
581 | struct cleanup *restore_personality |
582 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 583 | |
42c81e2a | 584 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
585 | pid = vfork (); |
586 | #else | |
da6d8c04 | 587 | pid = fork (); |
52fb6437 | 588 | #endif |
da6d8c04 DJ |
589 | if (pid < 0) |
590 | perror_with_name ("fork"); | |
591 | ||
592 | if (pid == 0) | |
593 | { | |
602e3198 | 594 | close_most_fds (); |
b8e1b30e | 595 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 596 | |
1a981360 | 597 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 598 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 599 | #endif |
0d62e5e8 | 600 | |
a9fa9f7d DJ |
601 | setpgid (0, 0); |
602 | ||
e0f9f062 DE |
603 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
604 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
605 | Also, redirect stdin to /dev/null. */ | |
606 | if (remote_connection_is_stdio ()) | |
607 | { | |
608 | close (0); | |
609 | open ("/dev/null", O_RDONLY); | |
610 | dup2 (2, 1); | |
3e52c33d JK |
611 | if (write (2, "stdin/stdout redirected\n", |
612 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
613 | { |
614 | /* Errors ignored. */; | |
615 | } | |
e0f9f062 DE |
616 | } |
617 | ||
2b876972 DJ |
618 | execv (program, allargs); |
619 | if (errno == ENOENT) | |
620 | execvp (program, allargs); | |
da6d8c04 DJ |
621 | |
622 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 623 | strerror (errno)); |
da6d8c04 DJ |
624 | fflush (stderr); |
625 | _exit (0177); | |
626 | } | |
627 | ||
8cc73a39 | 628 | do_cleanups (restore_personality); |
03583c20 | 629 | |
95954743 PA |
630 | linux_add_process (pid, 0); |
631 | ||
632 | ptid = ptid_build (pid, pid, 0); | |
633 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 634 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 635 | |
a9fa9f7d | 636 | return pid; |
da6d8c04 DJ |
637 | } |
638 | ||
8784d563 PA |
639 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
640 | error. */ | |
da6d8c04 | 641 | |
7ae1a6a6 PA |
642 | int |
643 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 644 | { |
54a0b537 | 645 | struct lwp_info *new_lwp; |
7ae1a6a6 | 646 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 647 | |
b8e1b30e | 648 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 649 | != 0) |
7ae1a6a6 | 650 | return errno; |
24a09b5f | 651 | |
b3312d80 | 652 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 653 | |
a6dbe5df PA |
654 | /* We need to wait for SIGSTOP before being able to make the next |
655 | ptrace call on this LWP. */ | |
656 | new_lwp->must_set_ptrace_flags = 1; | |
657 | ||
644cebc9 | 658 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
659 | { |
660 | if (debug_threads) | |
87ce2a04 | 661 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
662 | |
663 | /* The process is definitely stopped. It is in a job control | |
664 | stop, unless the kernel predates the TASK_STOPPED / | |
665 | TASK_TRACED distinction, in which case it might be in a | |
666 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
667 | can kill it, signal it, et cetera. | |
668 | ||
669 | First make sure there is a pending SIGSTOP. Since we are | |
670 | already attached, the process can not transition from stopped | |
671 | to running without a PTRACE_CONT; so we know this signal will | |
672 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
673 | probably already in the queue (unless this kernel is old | |
674 | enough to use TASK_STOPPED for ptrace stops); but since | |
675 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
676 | kill_lwp (lwpid, SIGSTOP); | |
677 | ||
678 | /* Finally, resume the stopped process. This will deliver the | |
679 | SIGSTOP (or a higher priority signal, just like normal | |
680 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 681 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
682 | } |
683 | ||
0d62e5e8 | 684 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
685 | brings it to a halt. |
686 | ||
687 | There are several cases to consider here: | |
688 | ||
689 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 690 | of a new thread that is being created. |
d50171e4 PA |
691 | In this case we should ignore that SIGSTOP and resume the |
692 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 693 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 694 | resume_continue. |
0e21c1ec DE |
695 | |
696 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
697 | to it via attach_inferior. |
698 | In this case we want the process thread to stop. | |
d50171e4 PA |
699 | This is handled by having linux_attach set last_resume_kind == |
700 | resume_stop after we return. | |
e3deef73 LM |
701 | |
702 | If the pid we are attaching to is also the tgid, we attach to and | |
703 | stop all the existing threads. Otherwise, we attach to pid and | |
704 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
705 | |
706 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
707 | existing threads. |
708 | In this case we want the thread to stop. | |
709 | FIXME: This case is currently not properly handled. | |
710 | We should wait for the SIGSTOP but don't. Things work apparently | |
711 | because enough time passes between when we ptrace (ATTACH) and when | |
712 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
713 | |
714 | On the other hand, if we are currently trying to stop all threads, we | |
715 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 716 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
717 | end of the list, and so the new thread has not yet reached |
718 | wait_for_sigstop (but will). */ | |
d50171e4 | 719 | new_lwp->stop_expected = 1; |
0d62e5e8 | 720 | |
7ae1a6a6 | 721 | return 0; |
95954743 PA |
722 | } |
723 | ||
8784d563 PA |
724 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
725 | already attached. Returns true if a new LWP is found, false | |
726 | otherwise. */ | |
727 | ||
728 | static int | |
729 | attach_proc_task_lwp_callback (ptid_t ptid) | |
730 | { | |
731 | /* Is this a new thread? */ | |
732 | if (find_thread_ptid (ptid) == NULL) | |
733 | { | |
734 | int lwpid = ptid_get_lwp (ptid); | |
735 | int err; | |
736 | ||
737 | if (debug_threads) | |
738 | debug_printf ("Found new lwp %d\n", lwpid); | |
739 | ||
740 | err = linux_attach_lwp (ptid); | |
741 | ||
742 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
743 | is returned if the thread's task still exists, and is marked | |
744 | as exited or zombie, as well as other conditions, so in that | |
745 | case, confirm the status in /proc/PID/status. */ | |
746 | if (err == ESRCH | |
747 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
748 | { | |
749 | if (debug_threads) | |
750 | { | |
751 | debug_printf ("Cannot attach to lwp %d: " | |
752 | "thread is gone (%d: %s)\n", | |
753 | lwpid, err, strerror (err)); | |
754 | } | |
755 | } | |
756 | else if (err != 0) | |
757 | { | |
758 | warning (_("Cannot attach to lwp %d: %s"), | |
759 | lwpid, | |
760 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
761 | } | |
762 | ||
763 | return 1; | |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
e3deef73 LM |
768 | /* Attach to PID. If PID is the tgid, attach to it and all |
769 | of its threads. */ | |
770 | ||
c52daf70 | 771 | static int |
a1928bad | 772 | linux_attach (unsigned long pid) |
0d62e5e8 | 773 | { |
7ae1a6a6 PA |
774 | ptid_t ptid = ptid_build (pid, pid, 0); |
775 | int err; | |
776 | ||
e3deef73 LM |
777 | /* Attach to PID. We will check for other threads |
778 | soon. */ | |
7ae1a6a6 PA |
779 | err = linux_attach_lwp (ptid); |
780 | if (err != 0) | |
781 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 782 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 783 | |
95954743 | 784 | linux_add_process (pid, 1); |
0d62e5e8 | 785 | |
bd99dc85 PA |
786 | if (!non_stop) |
787 | { | |
8336d594 PA |
788 | struct thread_info *thread; |
789 | ||
790 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
791 | process. It will be collected by wait shortly. */ | |
792 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
793 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 794 | } |
0d62e5e8 | 795 | |
8784d563 PA |
796 | /* We must attach to every LWP. If /proc is mounted, use that to |
797 | find them now. On the one hand, the inferior may be using raw | |
798 | clone instead of using pthreads. On the other hand, even if it | |
799 | is using pthreads, GDB may not be connected yet (thread_db needs | |
800 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
801 | structures in the inferior's address space to find the list of | |
802 | threads/LWPs, and those structures may well be corrupted. Note | |
803 | that once thread_db is loaded, we'll still use it to list threads | |
804 | and associate pthread info with each LWP. */ | |
805 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
806 | return 0; |
807 | } | |
808 | ||
809 | struct counter | |
810 | { | |
811 | int pid; | |
812 | int count; | |
813 | }; | |
814 | ||
815 | static int | |
816 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
817 | { | |
818 | struct counter *counter = args; | |
819 | ||
820 | if (ptid_get_pid (entry->id) == counter->pid) | |
821 | { | |
822 | if (++counter->count > 1) | |
823 | return 1; | |
824 | } | |
d61ddec4 | 825 | |
da6d8c04 DJ |
826 | return 0; |
827 | } | |
828 | ||
95954743 | 829 | static int |
fa96cb38 | 830 | last_thread_of_process_p (int pid) |
95954743 | 831 | { |
95954743 | 832 | struct counter counter = { pid , 0 }; |
da6d8c04 | 833 | |
95954743 PA |
834 | return (find_inferior (&all_threads, |
835 | second_thread_of_pid_p, &counter) == NULL); | |
836 | } | |
837 | ||
da84f473 PA |
838 | /* Kill LWP. */ |
839 | ||
840 | static void | |
841 | linux_kill_one_lwp (struct lwp_info *lwp) | |
842 | { | |
d86d4aaf DE |
843 | struct thread_info *thr = get_lwp_thread (lwp); |
844 | int pid = lwpid_of (thr); | |
da84f473 PA |
845 | |
846 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
847 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
848 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
849 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
850 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
851 | per process, not one for each thread. But since we still support | |
852 | linuxthreads, and we also support debugging programs using raw | |
853 | clone without CLONE_THREAD, we send one for each thread. For | |
854 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
855 | about some old kernels where PTRACE_KILL might work better | |
856 | (dubious if there are any such, but that's why it's paranoia), so | |
857 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
858 | everywhere. */ | |
859 | ||
860 | errno = 0; | |
69ff6be5 | 861 | kill_lwp (pid, SIGKILL); |
da84f473 | 862 | if (debug_threads) |
ce9e3fe7 PA |
863 | { |
864 | int save_errno = errno; | |
865 | ||
866 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
867 | target_pid_to_str (ptid_of (thr)), | |
868 | save_errno ? strerror (save_errno) : "OK"); | |
869 | } | |
da84f473 PA |
870 | |
871 | errno = 0; | |
b8e1b30e | 872 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 873 | if (debug_threads) |
ce9e3fe7 PA |
874 | { |
875 | int save_errno = errno; | |
876 | ||
877 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
878 | target_pid_to_str (ptid_of (thr)), | |
879 | save_errno ? strerror (save_errno) : "OK"); | |
880 | } | |
da84f473 PA |
881 | } |
882 | ||
e76126e8 PA |
883 | /* Kill LWP and wait for it to die. */ |
884 | ||
885 | static void | |
886 | kill_wait_lwp (struct lwp_info *lwp) | |
887 | { | |
888 | struct thread_info *thr = get_lwp_thread (lwp); | |
889 | int pid = ptid_get_pid (ptid_of (thr)); | |
890 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
891 | int wstat; | |
892 | int res; | |
893 | ||
894 | if (debug_threads) | |
895 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
896 | ||
897 | do | |
898 | { | |
899 | linux_kill_one_lwp (lwp); | |
900 | ||
901 | /* Make sure it died. Notes: | |
902 | ||
903 | - The loop is most likely unnecessary. | |
904 | ||
905 | - We don't use linux_wait_for_event as that could delete lwps | |
906 | while we're iterating over them. We're not interested in | |
907 | any pending status at this point, only in making sure all | |
908 | wait status on the kernel side are collected until the | |
909 | process is reaped. | |
910 | ||
911 | - We don't use __WALL here as the __WALL emulation relies on | |
912 | SIGCHLD, and killing a stopped process doesn't generate | |
913 | one, nor an exit status. | |
914 | */ | |
915 | res = my_waitpid (lwpid, &wstat, 0); | |
916 | if (res == -1 && errno == ECHILD) | |
917 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
918 | } while (res > 0 && WIFSTOPPED (wstat)); | |
919 | ||
920 | gdb_assert (res > 0); | |
921 | } | |
922 | ||
da84f473 PA |
923 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
924 | except the leader. */ | |
95954743 PA |
925 | |
926 | static int | |
da84f473 | 927 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 928 | { |
0d62e5e8 | 929 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 930 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
931 | int pid = * (int *) args; |
932 | ||
933 | if (ptid_get_pid (entry->id) != pid) | |
934 | return 0; | |
0d62e5e8 | 935 | |
fd500816 DJ |
936 | /* We avoid killing the first thread here, because of a Linux kernel (at |
937 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
938 | the children get a chance to be reaped, it will remain a zombie | |
939 | forever. */ | |
95954743 | 940 | |
d86d4aaf | 941 | if (lwpid_of (thread) == pid) |
95954743 PA |
942 | { |
943 | if (debug_threads) | |
87ce2a04 DE |
944 | debug_printf ("lkop: is last of process %s\n", |
945 | target_pid_to_str (entry->id)); | |
95954743 PA |
946 | return 0; |
947 | } | |
fd500816 | 948 | |
e76126e8 | 949 | kill_wait_lwp (lwp); |
95954743 | 950 | return 0; |
da6d8c04 DJ |
951 | } |
952 | ||
95954743 PA |
953 | static int |
954 | linux_kill (int pid) | |
0d62e5e8 | 955 | { |
95954743 | 956 | struct process_info *process; |
54a0b537 | 957 | struct lwp_info *lwp; |
fd500816 | 958 | |
95954743 PA |
959 | process = find_process_pid (pid); |
960 | if (process == NULL) | |
961 | return -1; | |
9d606399 | 962 | |
f9e39928 PA |
963 | /* If we're killing a running inferior, make sure it is stopped |
964 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 965 | stop_all_lwps (0, NULL); |
f9e39928 | 966 | |
da84f473 | 967 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 968 | |
54a0b537 | 969 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 970 | thread in the list, so do so now. */ |
95954743 | 971 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 972 | |
784867a5 | 973 | if (lwp == NULL) |
fd500816 | 974 | { |
784867a5 | 975 | if (debug_threads) |
d86d4aaf DE |
976 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
977 | pid); | |
784867a5 JK |
978 | } |
979 | else | |
e76126e8 | 980 | kill_wait_lwp (lwp); |
2d717e4f | 981 | |
8336d594 | 982 | the_target->mourn (process); |
f9e39928 PA |
983 | |
984 | /* Since we presently can only stop all lwps of all processes, we | |
985 | need to unstop lwps of other processes. */ | |
7984d532 | 986 | unstop_all_lwps (0, NULL); |
95954743 | 987 | return 0; |
0d62e5e8 DJ |
988 | } |
989 | ||
9b224c5e PA |
990 | /* Get pending signal of THREAD, for detaching purposes. This is the |
991 | signal the thread last stopped for, which we need to deliver to the | |
992 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
993 | ||
994 | static int | |
995 | get_detach_signal (struct thread_info *thread) | |
996 | { | |
a493e3e2 | 997 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
998 | int status; |
999 | struct lwp_info *lp = get_thread_lwp (thread); | |
1000 | ||
1001 | if (lp->status_pending_p) | |
1002 | status = lp->status_pending; | |
1003 | else | |
1004 | { | |
1005 | /* If the thread had been suspended by gdbserver, and it stopped | |
1006 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1007 | want to deliver that SIGSTOP. */ | |
1008 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1009 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1010 | return 0; |
1011 | ||
1012 | /* Otherwise, we may need to deliver the signal we | |
1013 | intercepted. */ | |
1014 | status = lp->last_status; | |
1015 | } | |
1016 | ||
1017 | if (!WIFSTOPPED (status)) | |
1018 | { | |
1019 | if (debug_threads) | |
87ce2a04 | 1020 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1021 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1026 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1027 | { |
1028 | if (debug_threads) | |
87ce2a04 DE |
1029 | debug_printf ("GPS: lwp %s had stopped with extended " |
1030 | "status: no pending signal\n", | |
d86d4aaf | 1031 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1032 | return 0; |
1033 | } | |
1034 | ||
2ea28649 | 1035 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1036 | |
1037 | if (program_signals_p && !program_signals[signo]) | |
1038 | { | |
1039 | if (debug_threads) | |
87ce2a04 | 1040 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1041 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1042 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1043 | return 0; |
1044 | } | |
1045 | else if (!program_signals_p | |
1046 | /* If we have no way to know which signals GDB does not | |
1047 | want to have passed to the program, assume | |
1048 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1049 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1050 | { |
1051 | if (debug_threads) | |
87ce2a04 DE |
1052 | debug_printf ("GPS: lwp %s had signal %s, " |
1053 | "but we don't know if we should pass it. " | |
1054 | "Default to not.\n", | |
d86d4aaf | 1055 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1056 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1057 | return 0; |
1058 | } | |
1059 | else | |
1060 | { | |
1061 | if (debug_threads) | |
87ce2a04 | 1062 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1063 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1064 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1065 | |
1066 | return WSTOPSIG (status); | |
1067 | } | |
1068 | } | |
1069 | ||
95954743 PA |
1070 | static int |
1071 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1072 | { |
1073 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1074 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1075 | int pid = * (int *) args; |
9b224c5e | 1076 | int sig; |
95954743 PA |
1077 | |
1078 | if (ptid_get_pid (entry->id) != pid) | |
1079 | return 0; | |
6ad8ae5c | 1080 | |
9b224c5e | 1081 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1082 | if (lwp->stop_expected) |
ae13219e | 1083 | { |
9b224c5e | 1084 | if (debug_threads) |
87ce2a04 | 1085 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1086 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1087 | |
d86d4aaf | 1088 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1089 | lwp->stop_expected = 0; |
ae13219e DJ |
1090 | } |
1091 | ||
1092 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1093 | regcache_invalidate_thread (thread); |
ae13219e | 1094 | |
9b224c5e PA |
1095 | /* Pass on any pending signal for this thread. */ |
1096 | sig = get_detach_signal (thread); | |
1097 | ||
ae13219e | 1098 | /* Finally, let it resume. */ |
82bfbe7e PA |
1099 | if (the_low_target.prepare_to_resume != NULL) |
1100 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1101 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1102 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1103 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1104 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1105 | strerror (errno)); |
bd99dc85 PA |
1106 | |
1107 | delete_lwp (lwp); | |
95954743 | 1108 | return 0; |
6ad8ae5c DJ |
1109 | } |
1110 | ||
95954743 PA |
1111 | static int |
1112 | linux_detach (int pid) | |
1113 | { | |
1114 | struct process_info *process; | |
1115 | ||
1116 | process = find_process_pid (pid); | |
1117 | if (process == NULL) | |
1118 | return -1; | |
1119 | ||
f9e39928 PA |
1120 | /* Stop all threads before detaching. First, ptrace requires that |
1121 | the thread is stopped to sucessfully detach. Second, thread_db | |
1122 | may need to uninstall thread event breakpoints from memory, which | |
1123 | only works with a stopped process anyway. */ | |
7984d532 | 1124 | stop_all_lwps (0, NULL); |
f9e39928 | 1125 | |
ca5c370d | 1126 | #ifdef USE_THREAD_DB |
8336d594 | 1127 | thread_db_detach (process); |
ca5c370d PA |
1128 | #endif |
1129 | ||
fa593d66 PA |
1130 | /* Stabilize threads (move out of jump pads). */ |
1131 | stabilize_threads (); | |
1132 | ||
95954743 | 1133 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1134 | |
1135 | the_target->mourn (process); | |
f9e39928 PA |
1136 | |
1137 | /* Since we presently can only stop all lwps of all processes, we | |
1138 | need to unstop lwps of other processes. */ | |
7984d532 | 1139 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1140 | return 0; |
1141 | } | |
1142 | ||
1143 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1144 | ||
1145 | static int | |
1146 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1147 | { | |
d86d4aaf DE |
1148 | struct thread_info *thread = (struct thread_info *) entry; |
1149 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1150 | struct process_info *process = proc; |
1151 | ||
d86d4aaf | 1152 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1153 | delete_lwp (lwp); |
1154 | ||
dd6953e1 | 1155 | return 0; |
6ad8ae5c DJ |
1156 | } |
1157 | ||
8336d594 PA |
1158 | static void |
1159 | linux_mourn (struct process_info *process) | |
1160 | { | |
1161 | struct process_info_private *priv; | |
1162 | ||
1163 | #ifdef USE_THREAD_DB | |
1164 | thread_db_mourn (process); | |
1165 | #endif | |
1166 | ||
d86d4aaf | 1167 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1168 | |
8336d594 PA |
1169 | /* Freeing all private data. */ |
1170 | priv = process->private; | |
1171 | free (priv->arch_private); | |
1172 | free (priv); | |
1173 | process->private = NULL; | |
505106cd PA |
1174 | |
1175 | remove_process (process); | |
8336d594 PA |
1176 | } |
1177 | ||
444d6139 | 1178 | static void |
95954743 | 1179 | linux_join (int pid) |
444d6139 | 1180 | { |
444d6139 PA |
1181 | int status, ret; |
1182 | ||
1183 | do { | |
95954743 | 1184 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1185 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1186 | break; | |
1187 | } while (ret != -1 || errno != ECHILD); | |
1188 | } | |
1189 | ||
6ad8ae5c | 1190 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1191 | static int |
95954743 | 1192 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1193 | { |
95954743 PA |
1194 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1195 | ||
1196 | /* We assume we always know if a thread exits. If a whole process | |
1197 | exited but we still haven't been able to report it to GDB, we'll | |
1198 | hold on to the last lwp of the dead process. */ | |
1199 | if (lwp != NULL) | |
1200 | return !lwp->dead; | |
0d62e5e8 DJ |
1201 | else |
1202 | return 0; | |
1203 | } | |
1204 | ||
582511be PA |
1205 | /* Return 1 if this lwp still has an interesting status pending. If |
1206 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1207 | false. */ | |
1208 | ||
1209 | static int | |
1210 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1211 | { | |
1212 | struct lwp_info *lp = get_thread_lwp (thread); | |
1213 | ||
1214 | if (!lp->status_pending_p) | |
1215 | return 0; | |
1216 | ||
1217 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1218 | report any status pending the LWP may have. */ | |
1219 | if (thread->last_resume_kind == resume_stop | |
1220 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1221 | return 0; | |
1222 | ||
1223 | if (thread->last_resume_kind != resume_stop | |
1224 | && (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1225 | || lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT)) | |
1226 | { | |
1227 | struct thread_info *saved_thread; | |
1228 | CORE_ADDR pc; | |
1229 | int discard = 0; | |
1230 | ||
1231 | gdb_assert (lp->last_status != 0); | |
1232 | ||
1233 | pc = get_pc (lp); | |
1234 | ||
1235 | saved_thread = current_thread; | |
1236 | current_thread = thread; | |
1237 | ||
1238 | if (pc != lp->stop_pc) | |
1239 | { | |
1240 | if (debug_threads) | |
1241 | debug_printf ("PC of %ld changed\n", | |
1242 | lwpid_of (thread)); | |
1243 | discard = 1; | |
1244 | } | |
1245 | else if (lp->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT | |
1246 | && !(*the_low_target.breakpoint_at) (pc)) | |
1247 | { | |
1248 | if (debug_threads) | |
1249 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1250 | lwpid_of (thread)); | |
1251 | discard = 1; | |
1252 | } | |
1253 | else if (lp->stop_reason == LWP_STOPPED_BY_HW_BREAKPOINT | |
1254 | && !hardware_breakpoint_inserted_here (pc)) | |
1255 | { | |
1256 | if (debug_threads) | |
1257 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1258 | lwpid_of (thread)); | |
1259 | discard = 1; | |
1260 | } | |
1261 | ||
1262 | current_thread = saved_thread; | |
1263 | ||
1264 | if (discard) | |
1265 | { | |
1266 | if (debug_threads) | |
1267 | debug_printf ("discarding pending breakpoint status\n"); | |
1268 | lp->status_pending_p = 0; | |
1269 | return 0; | |
1270 | } | |
1271 | } | |
1272 | ||
1273 | return 1; | |
1274 | } | |
1275 | ||
6bf5e0ba | 1276 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1277 | static int |
d50171e4 | 1278 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1279 | { |
d86d4aaf | 1280 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1281 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1282 | ptid_t ptid = * (ptid_t *) arg; |
1283 | ||
1284 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1285 | or a specific LWP. */ |
1286 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1287 | return 0; |
0d62e5e8 | 1288 | |
582511be PA |
1289 | if (lp->status_pending_p |
1290 | && !thread_still_has_status_pending_p (thread)) | |
1291 | { | |
1292 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1293 | return 0; | |
1294 | } | |
0d62e5e8 | 1295 | |
582511be | 1296 | return lp->status_pending_p; |
0d62e5e8 DJ |
1297 | } |
1298 | ||
95954743 PA |
1299 | static int |
1300 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1301 | { | |
1302 | ptid_t ptid = *(ptid_t *) data; | |
1303 | int lwp; | |
1304 | ||
1305 | if (ptid_get_lwp (ptid) != 0) | |
1306 | lwp = ptid_get_lwp (ptid); | |
1307 | else | |
1308 | lwp = ptid_get_pid (ptid); | |
1309 | ||
1310 | if (ptid_get_lwp (entry->id) == lwp) | |
1311 | return 1; | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | struct lwp_info * | |
1317 | find_lwp_pid (ptid_t ptid) | |
1318 | { | |
d86d4aaf DE |
1319 | struct inferior_list_entry *thread |
1320 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1321 | ||
1322 | if (thread == NULL) | |
1323 | return NULL; | |
1324 | ||
1325 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1326 | } |
1327 | ||
fa96cb38 | 1328 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1329 | |
fa96cb38 PA |
1330 | static int |
1331 | num_lwps (int pid) | |
1332 | { | |
1333 | struct inferior_list_entry *inf, *tmp; | |
1334 | int count = 0; | |
0d62e5e8 | 1335 | |
fa96cb38 | 1336 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1337 | { |
fa96cb38 PA |
1338 | if (ptid_get_pid (inf->id) == pid) |
1339 | count++; | |
24a09b5f | 1340 | } |
3aee8918 | 1341 | |
fa96cb38 PA |
1342 | return count; |
1343 | } | |
d61ddec4 | 1344 | |
fa96cb38 PA |
1345 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1346 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1347 | |
fa96cb38 PA |
1348 | static void |
1349 | check_zombie_leaders (void) | |
1350 | { | |
1351 | struct process_info *proc, *tmp; | |
c3adc08c | 1352 | |
fa96cb38 | 1353 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1354 | { |
fa96cb38 PA |
1355 | pid_t leader_pid = pid_of (proc); |
1356 | struct lwp_info *leader_lp; | |
c3adc08c | 1357 | |
fa96cb38 | 1358 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1359 | |
fa96cb38 PA |
1360 | if (debug_threads) |
1361 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1362 | "num_lwps=%d, zombie=%d\n", | |
1363 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1364 | linux_proc_pid_is_zombie (leader_pid)); | |
1365 | ||
1366 | if (leader_lp != NULL | |
1367 | /* Check if there are other threads in the group, as we may | |
1368 | have raced with the inferior simply exiting. */ | |
1369 | && !last_thread_of_process_p (leader_pid) | |
1370 | && linux_proc_pid_is_zombie (leader_pid)) | |
1371 | { | |
1372 | /* A leader zombie can mean one of two things: | |
1373 | ||
1374 | - It exited, and there's an exit status pending | |
1375 | available, or only the leader exited (not the whole | |
1376 | program). In the latter case, we can't waitpid the | |
1377 | leader's exit status until all other threads are gone. | |
1378 | ||
1379 | - There are 3 or more threads in the group, and a thread | |
1380 | other than the leader exec'd. On an exec, the Linux | |
1381 | kernel destroys all other threads (except the execing | |
1382 | one) in the thread group, and resets the execing thread's | |
1383 | tid to the tgid. No exit notification is sent for the | |
1384 | execing thread -- from the ptracer's perspective, it | |
1385 | appears as though the execing thread just vanishes. | |
1386 | Until we reap all other threads except the leader and the | |
1387 | execing thread, the leader will be zombie, and the | |
1388 | execing thread will be in `D (disc sleep)'. As soon as | |
1389 | all other threads are reaped, the execing thread changes | |
1390 | it's tid to the tgid, and the previous (zombie) leader | |
1391 | vanishes, giving place to the "new" leader. We could try | |
1392 | distinguishing the exit and exec cases, by waiting once | |
1393 | more, and seeing if something comes out, but it doesn't | |
1394 | sound useful. The previous leader _does_ go away, and | |
1395 | we'll re-add the new one once we see the exec event | |
1396 | (which is just the same as what would happen if the | |
1397 | previous leader did exit voluntarily before some other | |
1398 | thread execs). */ | |
c3adc08c | 1399 | |
fa96cb38 PA |
1400 | if (debug_threads) |
1401 | fprintf (stderr, | |
1402 | "CZL: Thread group leader %d zombie " | |
1403 | "(it exited, or another thread execd).\n", | |
1404 | leader_pid); | |
c3adc08c | 1405 | |
fa96cb38 | 1406 | delete_lwp (leader_lp); |
c3adc08c PA |
1407 | } |
1408 | } | |
fa96cb38 | 1409 | } |
c3adc08c | 1410 | |
fa96cb38 PA |
1411 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1412 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1413 | |
fa96cb38 PA |
1414 | static int |
1415 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1416 | { | |
1417 | struct thread_info *thr = (struct thread_info *) entry; | |
1418 | struct lwp_info *lwp; | |
1419 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1420 | |
fa96cb38 PA |
1421 | if (!ptid_match (ptid_of (thr), filter)) |
1422 | return 0; | |
bd99dc85 | 1423 | |
fa96cb38 PA |
1424 | lwp = get_thread_lwp (thr); |
1425 | if (!lwp->stopped) | |
1426 | return 1; | |
1427 | ||
1428 | return 0; | |
0d62e5e8 | 1429 | } |
611cb4a5 | 1430 | |
219f2f23 PA |
1431 | /* This function should only be called if the LWP got a SIGTRAP. |
1432 | ||
1433 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1434 | event was handled, 0 otherwise. */ | |
1435 | ||
1436 | static int | |
1437 | handle_tracepoints (struct lwp_info *lwp) | |
1438 | { | |
1439 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1440 | int tpoint_related_event = 0; | |
1441 | ||
582511be PA |
1442 | gdb_assert (lwp->suspended == 0); |
1443 | ||
7984d532 PA |
1444 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1445 | uninsert tracepoints. To do this, we temporarily pause all | |
1446 | threads, unpatch away, and then unpause threads. We need to make | |
1447 | sure the unpausing doesn't resume LWP too. */ | |
1448 | lwp->suspended++; | |
1449 | ||
219f2f23 PA |
1450 | /* And we need to be sure that any all-threads-stopping doesn't try |
1451 | to move threads out of the jump pads, as it could deadlock the | |
1452 | inferior (LWP could be in the jump pad, maybe even holding the | |
1453 | lock.) */ | |
1454 | ||
1455 | /* Do any necessary step collect actions. */ | |
1456 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1457 | ||
fa593d66 PA |
1458 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1459 | ||
219f2f23 PA |
1460 | /* See if we just hit a tracepoint and do its main collect |
1461 | actions. */ | |
1462 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1463 | ||
7984d532 PA |
1464 | lwp->suspended--; |
1465 | ||
1466 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1467 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1468 | |
219f2f23 PA |
1469 | if (tpoint_related_event) |
1470 | { | |
1471 | if (debug_threads) | |
87ce2a04 | 1472 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1473 | return 1; |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | } | |
1478 | ||
fa593d66 PA |
1479 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1480 | fast tracepoint. */ | |
1481 | ||
1482 | static int | |
1483 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1484 | struct fast_tpoint_collect_status *status) | |
1485 | { | |
1486 | CORE_ADDR thread_area; | |
d86d4aaf | 1487 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1488 | |
1489 | if (the_low_target.get_thread_area == NULL) | |
1490 | return 0; | |
1491 | ||
1492 | /* Get the thread area address. This is used to recognize which | |
1493 | thread is which when tracing with the in-process agent library. | |
1494 | We don't read anything from the address, and treat it as opaque; | |
1495 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1496 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1497 | return 0; |
1498 | ||
1499 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1500 | } | |
1501 | ||
1502 | /* The reason we resume in the caller, is because we want to be able | |
1503 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1504 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1505 | refuses to resume. */ | |
1506 | ||
1507 | static int | |
1508 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1509 | { | |
0bfdf32f | 1510 | struct thread_info *saved_thread; |
fa593d66 | 1511 | |
0bfdf32f GB |
1512 | saved_thread = current_thread; |
1513 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1514 | |
1515 | if ((wstat == NULL | |
1516 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1517 | && supports_fast_tracepoints () | |
58b4daa5 | 1518 | && agent_loaded_p ()) |
fa593d66 PA |
1519 | { |
1520 | struct fast_tpoint_collect_status status; | |
1521 | int r; | |
1522 | ||
1523 | if (debug_threads) | |
87ce2a04 DE |
1524 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1525 | "jump pad.\n", | |
0bfdf32f | 1526 | lwpid_of (current_thread)); |
fa593d66 PA |
1527 | |
1528 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1529 | ||
1530 | if (wstat == NULL | |
1531 | || (WSTOPSIG (*wstat) != SIGILL | |
1532 | && WSTOPSIG (*wstat) != SIGFPE | |
1533 | && WSTOPSIG (*wstat) != SIGSEGV | |
1534 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1535 | { | |
1536 | lwp->collecting_fast_tracepoint = r; | |
1537 | ||
1538 | if (r != 0) | |
1539 | { | |
1540 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1541 | { | |
1542 | /* Haven't executed the original instruction yet. | |
1543 | Set breakpoint there, and wait till it's hit, | |
1544 | then single-step until exiting the jump pad. */ | |
1545 | lwp->exit_jump_pad_bkpt | |
1546 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1547 | } | |
1548 | ||
1549 | if (debug_threads) | |
87ce2a04 DE |
1550 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1551 | "the jump pad...it does\n", | |
0bfdf32f GB |
1552 | lwpid_of (current_thread)); |
1553 | current_thread = saved_thread; | |
fa593d66 PA |
1554 | |
1555 | return 1; | |
1556 | } | |
1557 | } | |
1558 | else | |
1559 | { | |
1560 | /* If we get a synchronous signal while collecting, *and* | |
1561 | while executing the (relocated) original instruction, | |
1562 | reset the PC to point at the tpoint address, before | |
1563 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1564 | report the signal to GDB, and pray for the best. */ | |
1565 | ||
1566 | lwp->collecting_fast_tracepoint = 0; | |
1567 | ||
1568 | if (r != 0 | |
1569 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1570 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1571 | { | |
1572 | siginfo_t info; | |
1573 | struct regcache *regcache; | |
1574 | ||
1575 | /* The si_addr on a few signals references the address | |
1576 | of the faulting instruction. Adjust that as | |
1577 | well. */ | |
1578 | if ((WSTOPSIG (*wstat) == SIGILL | |
1579 | || WSTOPSIG (*wstat) == SIGFPE | |
1580 | || WSTOPSIG (*wstat) == SIGBUS | |
1581 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1582 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1583 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1584 | /* Final check just to make sure we don't clobber |
1585 | the siginfo of non-kernel-sent signals. */ | |
1586 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1587 | { | |
1588 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1589 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1590 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1591 | } |
1592 | ||
0bfdf32f | 1593 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1594 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1595 | lwp->stop_pc = status.tpoint_addr; | |
1596 | ||
1597 | /* Cancel any fast tracepoint lock this thread was | |
1598 | holding. */ | |
1599 | force_unlock_trace_buffer (); | |
1600 | } | |
1601 | ||
1602 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1603 | { | |
1604 | if (debug_threads) | |
87ce2a04 DE |
1605 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1606 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1607 | |
1608 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1609 | |
1610 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1611 | lwp->exit_jump_pad_bkpt = NULL; | |
1612 | ||
1613 | unstop_all_lwps (1, lwp); | |
1614 | ||
1615 | gdb_assert (lwp->suspended >= 0); | |
1616 | } | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | if (debug_threads) | |
87ce2a04 DE |
1621 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1622 | "jump pad...no\n", | |
0bfdf32f | 1623 | lwpid_of (current_thread)); |
0cccb683 | 1624 | |
0bfdf32f | 1625 | current_thread = saved_thread; |
fa593d66 PA |
1626 | return 0; |
1627 | } | |
1628 | ||
1629 | /* Enqueue one signal in the "signals to report later when out of the | |
1630 | jump pad" list. */ | |
1631 | ||
1632 | static void | |
1633 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1634 | { | |
1635 | struct pending_signals *p_sig; | |
d86d4aaf | 1636 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1637 | |
1638 | if (debug_threads) | |
87ce2a04 | 1639 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1640 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1641 | |
1642 | if (debug_threads) | |
1643 | { | |
1644 | struct pending_signals *sig; | |
1645 | ||
1646 | for (sig = lwp->pending_signals_to_report; | |
1647 | sig != NULL; | |
1648 | sig = sig->prev) | |
87ce2a04 DE |
1649 | debug_printf (" Already queued %d\n", |
1650 | sig->signal); | |
fa593d66 | 1651 | |
87ce2a04 | 1652 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1653 | } |
1654 | ||
1a981360 PA |
1655 | /* Don't enqueue non-RT signals if they are already in the deferred |
1656 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1657 | twice) */ | |
1658 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1659 | { | |
1660 | struct pending_signals *sig; | |
1661 | ||
1662 | for (sig = lwp->pending_signals_to_report; | |
1663 | sig != NULL; | |
1664 | sig = sig->prev) | |
1665 | { | |
1666 | if (sig->signal == WSTOPSIG (*wstat)) | |
1667 | { | |
1668 | if (debug_threads) | |
87ce2a04 DE |
1669 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1670 | " for LWP %ld\n", | |
1671 | sig->signal, | |
d86d4aaf | 1672 | lwpid_of (thread)); |
1a981360 PA |
1673 | return; |
1674 | } | |
1675 | } | |
1676 | } | |
1677 | ||
fa593d66 PA |
1678 | p_sig = xmalloc (sizeof (*p_sig)); |
1679 | p_sig->prev = lwp->pending_signals_to_report; | |
1680 | p_sig->signal = WSTOPSIG (*wstat); | |
1681 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1682 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1683 | &p_sig->info); |
fa593d66 PA |
1684 | |
1685 | lwp->pending_signals_to_report = p_sig; | |
1686 | } | |
1687 | ||
1688 | /* Dequeue one signal from the "signals to report later when out of | |
1689 | the jump pad" list. */ | |
1690 | ||
1691 | static int | |
1692 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1693 | { | |
d86d4aaf DE |
1694 | struct thread_info *thread = get_lwp_thread (lwp); |
1695 | ||
fa593d66 PA |
1696 | if (lwp->pending_signals_to_report != NULL) |
1697 | { | |
1698 | struct pending_signals **p_sig; | |
1699 | ||
1700 | p_sig = &lwp->pending_signals_to_report; | |
1701 | while ((*p_sig)->prev != NULL) | |
1702 | p_sig = &(*p_sig)->prev; | |
1703 | ||
1704 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1705 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1706 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1707 | &(*p_sig)->info); |
fa593d66 PA |
1708 | free (*p_sig); |
1709 | *p_sig = NULL; | |
1710 | ||
1711 | if (debug_threads) | |
87ce2a04 | 1712 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1713 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1714 | |
1715 | if (debug_threads) | |
1716 | { | |
1717 | struct pending_signals *sig; | |
1718 | ||
1719 | for (sig = lwp->pending_signals_to_report; | |
1720 | sig != NULL; | |
1721 | sig = sig->prev) | |
87ce2a04 DE |
1722 | debug_printf (" Still queued %d\n", |
1723 | sig->signal); | |
fa593d66 | 1724 | |
87ce2a04 | 1725 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1726 | } |
1727 | ||
1728 | return 1; | |
1729 | } | |
1730 | ||
1731 | return 0; | |
1732 | } | |
1733 | ||
582511be PA |
1734 | /* Fetch the possibly triggered data watchpoint info and store it in |
1735 | CHILD. | |
d50171e4 | 1736 | |
582511be PA |
1737 | On some archs, like x86, that use debug registers to set |
1738 | watchpoints, it's possible that the way to know which watched | |
1739 | address trapped, is to check the register that is used to select | |
1740 | which address to watch. Problem is, between setting the watchpoint | |
1741 | and reading back which data address trapped, the user may change | |
1742 | the set of watchpoints, and, as a consequence, GDB changes the | |
1743 | debug registers in the inferior. To avoid reading back a stale | |
1744 | stopped-data-address when that happens, we cache in LP the fact | |
1745 | that a watchpoint trapped, and the corresponding data address, as | |
1746 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
1747 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 1748 | |
582511be PA |
1749 | static int |
1750 | check_stopped_by_watchpoint (struct lwp_info *child) | |
1751 | { | |
1752 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 1753 | { |
582511be | 1754 | struct thread_info *saved_thread; |
d50171e4 | 1755 | |
582511be PA |
1756 | saved_thread = current_thread; |
1757 | current_thread = get_lwp_thread (child); | |
1758 | ||
1759 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 1760 | { |
582511be PA |
1761 | child->stop_reason = LWP_STOPPED_BY_WATCHPOINT; |
1762 | ||
1763 | if (the_low_target.stopped_data_address != NULL) | |
1764 | child->stopped_data_address | |
1765 | = the_low_target.stopped_data_address (); | |
1766 | else | |
1767 | child->stopped_data_address = 0; | |
d50171e4 PA |
1768 | } |
1769 | ||
0bfdf32f | 1770 | current_thread = saved_thread; |
d50171e4 PA |
1771 | } |
1772 | ||
582511be | 1773 | return child->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
1774 | } |
1775 | ||
fa96cb38 PA |
1776 | /* Do low-level handling of the event, and check if we should go on |
1777 | and pass it to caller code. Return the affected lwp if we are, or | |
1778 | NULL otherwise. */ | |
1779 | ||
1780 | static struct lwp_info * | |
582511be | 1781 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
1782 | { |
1783 | struct lwp_info *child; | |
1784 | struct thread_info *thread; | |
582511be | 1785 | int have_stop_pc = 0; |
fa96cb38 PA |
1786 | |
1787 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1788 | ||
1789 | /* If we didn't find a process, one of two things presumably happened: | |
1790 | - A process we started and then detached from has exited. Ignore it. | |
1791 | - A process we are controlling has forked and the new child's stop | |
1792 | was reported to us by the kernel. Save its PID. */ | |
1793 | if (child == NULL && WIFSTOPPED (wstat)) | |
1794 | { | |
1795 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1796 | return NULL; | |
1797 | } | |
1798 | else if (child == NULL) | |
1799 | return NULL; | |
1800 | ||
1801 | thread = get_lwp_thread (child); | |
1802 | ||
1803 | child->stopped = 1; | |
1804 | ||
1805 | child->last_status = wstat; | |
1806 | ||
582511be PA |
1807 | /* Check if the thread has exited. */ |
1808 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
1809 | { | |
1810 | if (debug_threads) | |
1811 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
1812 | if (num_lwps (pid_of (thread)) > 1) | |
1813 | { | |
1814 | ||
1815 | /* If there is at least one more LWP, then the exit signal was | |
1816 | not the end of the debugged application and should be | |
1817 | ignored. */ | |
1818 | delete_lwp (child); | |
1819 | return NULL; | |
1820 | } | |
1821 | else | |
1822 | { | |
1823 | /* This was the last lwp in the process. Since events are | |
1824 | serialized to GDB core, and we can't report this one | |
1825 | right now, but GDB core and the other target layers will | |
1826 | want to be notified about the exit code/signal, leave the | |
1827 | status pending for the next time we're able to report | |
1828 | it. */ | |
1829 | mark_lwp_dead (child, wstat); | |
1830 | return child; | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | gdb_assert (WIFSTOPPED (wstat)); | |
1835 | ||
fa96cb38 PA |
1836 | if (WIFSTOPPED (wstat)) |
1837 | { | |
1838 | struct process_info *proc; | |
1839 | ||
1840 | /* Architecture-specific setup after inferior is running. This | |
1841 | needs to happen after we have attached to the inferior and it | |
1842 | is stopped for the first time, but before we access any | |
1843 | inferior registers. */ | |
1844 | proc = find_process_pid (pid_of (thread)); | |
1845 | if (proc->private->new_inferior) | |
1846 | { | |
0bfdf32f | 1847 | struct thread_info *saved_thread; |
fa96cb38 | 1848 | |
0bfdf32f GB |
1849 | saved_thread = current_thread; |
1850 | current_thread = thread; | |
fa96cb38 PA |
1851 | |
1852 | the_low_target.arch_setup (); | |
1853 | ||
0bfdf32f | 1854 | current_thread = saved_thread; |
fa96cb38 PA |
1855 | |
1856 | proc->private->new_inferior = 0; | |
1857 | } | |
1858 | } | |
1859 | ||
fa96cb38 PA |
1860 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
1861 | { | |
beed38b8 JB |
1862 | struct process_info *proc = find_process_pid (pid_of (thread)); |
1863 | ||
1864 | linux_enable_event_reporting (lwpid, proc->attached); | |
fa96cb38 PA |
1865 | child->must_set_ptrace_flags = 0; |
1866 | } | |
1867 | ||
582511be PA |
1868 | /* Be careful to not overwrite stop_pc until |
1869 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 1870 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 1871 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 1872 | { |
582511be | 1873 | child->stop_pc = get_pc (child); |
fa96cb38 PA |
1874 | handle_extended_wait (child, wstat); |
1875 | return NULL; | |
1876 | } | |
1877 | ||
582511be PA |
1878 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
1879 | && check_stopped_by_watchpoint (child)) | |
1880 | ; | |
c9587f88 | 1881 | else if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) |
582511be PA |
1882 | { |
1883 | if (check_stopped_by_breakpoint (child)) | |
1884 | have_stop_pc = 1; | |
1885 | } | |
1886 | ||
1887 | if (!have_stop_pc) | |
1888 | child->stop_pc = get_pc (child); | |
1889 | ||
fa96cb38 PA |
1890 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
1891 | && child->stop_expected) | |
1892 | { | |
1893 | if (debug_threads) | |
1894 | debug_printf ("Expected stop.\n"); | |
1895 | child->stop_expected = 0; | |
1896 | ||
1897 | if (thread->last_resume_kind == resume_stop) | |
1898 | { | |
1899 | /* We want to report the stop to the core. Treat the | |
1900 | SIGSTOP as a normal event. */ | |
1901 | } | |
1902 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1903 | { | |
1904 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 1905 | pending. */ |
fa96cb38 PA |
1906 | return NULL; |
1907 | } | |
1908 | else | |
1909 | { | |
1910 | /* Filter out the event. */ | |
1911 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1912 | return NULL; | |
1913 | } | |
1914 | } | |
1915 | ||
582511be PA |
1916 | child->status_pending_p = 1; |
1917 | child->status_pending = wstat; | |
fa96cb38 PA |
1918 | return child; |
1919 | } | |
1920 | ||
20ba1ce6 PA |
1921 | /* Resume LWPs that are currently stopped without any pending status |
1922 | to report, but are resumed from the core's perspective. */ | |
1923 | ||
1924 | static void | |
1925 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
1926 | { | |
1927 | struct thread_info *thread = (struct thread_info *) entry; | |
1928 | struct lwp_info *lp = get_thread_lwp (thread); | |
1929 | ||
1930 | if (lp->stopped | |
1931 | && !lp->status_pending_p | |
1932 | && thread->last_resume_kind != resume_stop | |
1933 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1934 | { | |
1935 | int step = thread->last_resume_kind == resume_step; | |
1936 | ||
1937 | if (debug_threads) | |
1938 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
1939 | target_pid_to_str (ptid_of (thread)), | |
1940 | paddress (lp->stop_pc), | |
1941 | step); | |
1942 | ||
1943 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
1944 | } | |
1945 | } | |
1946 | ||
fa96cb38 PA |
1947 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
1948 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
1949 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
1950 | lwps of a thread group; or a PTID representing a single lwp. Store | |
1951 | the stop status through the status pointer WSTAT. OPTIONS is | |
1952 | passed to the waitpid call. Return 0 if no event was found and | |
1953 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
1954 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 1955 | |
0d62e5e8 | 1956 | static int |
fa96cb38 PA |
1957 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
1958 | int *wstatp, int options) | |
0d62e5e8 | 1959 | { |
d86d4aaf | 1960 | struct thread_info *event_thread; |
d50171e4 | 1961 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 1962 | sigset_t block_mask, prev_mask; |
d50171e4 | 1963 | |
fa96cb38 | 1964 | retry: |
d86d4aaf DE |
1965 | /* N.B. event_thread points to the thread_info struct that contains |
1966 | event_child. Keep them in sync. */ | |
1967 | event_thread = NULL; | |
d50171e4 PA |
1968 | event_child = NULL; |
1969 | requested_child = NULL; | |
0d62e5e8 | 1970 | |
95954743 | 1971 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1972 | |
fa96cb38 | 1973 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 1974 | { |
d86d4aaf | 1975 | event_thread = (struct thread_info *) |
fa96cb38 | 1976 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
1977 | if (event_thread != NULL) |
1978 | event_child = get_thread_lwp (event_thread); | |
1979 | if (debug_threads && event_thread) | |
1980 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 1981 | } |
fa96cb38 | 1982 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 1983 | { |
fa96cb38 | 1984 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 1985 | |
bde24c0a | 1986 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1987 | && requested_child->status_pending_p |
1988 | && requested_child->collecting_fast_tracepoint) | |
1989 | { | |
1990 | enqueue_one_deferred_signal (requested_child, | |
1991 | &requested_child->status_pending); | |
1992 | requested_child->status_pending_p = 0; | |
1993 | requested_child->status_pending = 0; | |
1994 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1995 | } | |
1996 | ||
1997 | if (requested_child->suspended | |
1998 | && requested_child->status_pending_p) | |
38e08fca GB |
1999 | { |
2000 | internal_error (__FILE__, __LINE__, | |
2001 | "requesting an event out of a" | |
2002 | " suspended child?"); | |
2003 | } | |
fa593d66 | 2004 | |
d50171e4 | 2005 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2006 | { |
2007 | event_child = requested_child; | |
2008 | event_thread = get_lwp_thread (event_child); | |
2009 | } | |
0d62e5e8 | 2010 | } |
611cb4a5 | 2011 | |
0d62e5e8 DJ |
2012 | if (event_child != NULL) |
2013 | { | |
bd99dc85 | 2014 | if (debug_threads) |
87ce2a04 | 2015 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2016 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2017 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2018 | event_child->status_pending_p = 0; |
2019 | event_child->status_pending = 0; | |
0bfdf32f | 2020 | current_thread = event_thread; |
d86d4aaf | 2021 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2022 | } |
2023 | ||
fa96cb38 PA |
2024 | /* But if we don't find a pending event, we'll have to wait. |
2025 | ||
2026 | We only enter this loop if no process has a pending wait status. | |
2027 | Thus any action taken in response to a wait status inside this | |
2028 | loop is responding as soon as we detect the status, not after any | |
2029 | pending events. */ | |
d8301ad1 | 2030 | |
fa96cb38 PA |
2031 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2032 | all signals while here. */ | |
2033 | sigfillset (&block_mask); | |
2034 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2035 | ||
582511be PA |
2036 | /* Always pull all events out of the kernel. We'll randomly select |
2037 | an event LWP out of all that have events, to prevent | |
2038 | starvation. */ | |
fa96cb38 | 2039 | while (event_child == NULL) |
0d62e5e8 | 2040 | { |
fa96cb38 | 2041 | pid_t ret = 0; |
0d62e5e8 | 2042 | |
fa96cb38 PA |
2043 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2044 | quirks: | |
0d62e5e8 | 2045 | |
fa96cb38 PA |
2046 | - If the thread group leader exits while other threads in the |
2047 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2048 | waitpid won't return an exit status until the other threads | |
2049 | in the group are reaped. | |
611cb4a5 | 2050 | |
fa96cb38 PA |
2051 | - When a non-leader thread execs, that thread just vanishes |
2052 | without reporting an exit (so we'd hang if we waited for it | |
2053 | explicitly in that case). The exec event is reported to | |
2054 | the TGID pid (although we don't currently enable exec | |
2055 | events). */ | |
2056 | errno = 0; | |
2057 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2058 | |
fa96cb38 PA |
2059 | if (debug_threads) |
2060 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2061 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2062 | |
fa96cb38 | 2063 | if (ret > 0) |
0d62e5e8 | 2064 | { |
89be2091 | 2065 | if (debug_threads) |
bd99dc85 | 2066 | { |
fa96cb38 PA |
2067 | debug_printf ("LLW: waitpid %ld received %s\n", |
2068 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2069 | } |
89be2091 | 2070 | |
582511be PA |
2071 | /* Filter all events. IOW, leave all events pending. We'll |
2072 | randomly select an event LWP out of all that have events | |
2073 | below. */ | |
2074 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2075 | /* Retry until nothing comes out of waitpid. A single |
2076 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2077 | continue; |
2078 | } | |
2079 | ||
20ba1ce6 PA |
2080 | /* Now that we've pulled all events out of the kernel, resume |
2081 | LWPs that don't have an interesting event to report. */ | |
2082 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2083 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2084 | ||
2085 | /* ... and find an LWP with a status to report to the core, if | |
2086 | any. */ | |
582511be PA |
2087 | event_thread = (struct thread_info *) |
2088 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2089 | if (event_thread != NULL) | |
2090 | { | |
2091 | event_child = get_thread_lwp (event_thread); | |
2092 | *wstatp = event_child->status_pending; | |
2093 | event_child->status_pending_p = 0; | |
2094 | event_child->status_pending = 0; | |
2095 | break; | |
2096 | } | |
2097 | ||
fa96cb38 PA |
2098 | /* Check for zombie thread group leaders. Those can't be reaped |
2099 | until all other threads in the thread group are. */ | |
2100 | check_zombie_leaders (); | |
2101 | ||
2102 | /* If there are no resumed children left in the set of LWPs we | |
2103 | want to wait for, bail. We can't just block in | |
2104 | waitpid/sigsuspend, because lwps might have been left stopped | |
2105 | in trace-stop state, and we'd be stuck forever waiting for | |
2106 | their status to change (which would only happen if we resumed | |
2107 | them). Even if WNOHANG is set, this return code is preferred | |
2108 | over 0 (below), as it is more detailed. */ | |
2109 | if ((find_inferior (&all_threads, | |
2110 | not_stopped_callback, | |
2111 | &wait_ptid) == NULL)) | |
a6dbe5df | 2112 | { |
fa96cb38 PA |
2113 | if (debug_threads) |
2114 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2115 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2116 | return -1; | |
a6dbe5df PA |
2117 | } |
2118 | ||
fa96cb38 PA |
2119 | /* No interesting event to report to the caller. */ |
2120 | if ((options & WNOHANG)) | |
24a09b5f | 2121 | { |
fa96cb38 PA |
2122 | if (debug_threads) |
2123 | debug_printf ("WNOHANG set, no event found\n"); | |
2124 | ||
2125 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2126 | return 0; | |
24a09b5f DJ |
2127 | } |
2128 | ||
fa96cb38 PA |
2129 | /* Block until we get an event reported with SIGCHLD. */ |
2130 | if (debug_threads) | |
2131 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2132 | |
fa96cb38 PA |
2133 | sigsuspend (&prev_mask); |
2134 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2135 | goto retry; | |
2136 | } | |
d50171e4 | 2137 | |
fa96cb38 | 2138 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2139 | |
0bfdf32f | 2140 | current_thread = event_thread; |
d50171e4 | 2141 | |
fa96cb38 PA |
2142 | /* Check for thread exit. */ |
2143 | if (! WIFSTOPPED (*wstatp)) | |
2144 | { | |
2145 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2146 | ||
2147 | if (debug_threads) | |
2148 | debug_printf ("LWP %d is the last lwp of process. " | |
2149 | "Process %ld exiting.\n", | |
2150 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2151 | return lwpid_of (event_thread); |
611cb4a5 | 2152 | } |
0d62e5e8 | 2153 | |
fa96cb38 PA |
2154 | return lwpid_of (event_thread); |
2155 | } | |
2156 | ||
2157 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2158 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2159 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2160 | the stop status through the status pointer WSTAT. OPTIONS is | |
2161 | passed to the waitpid call. Return 0 if no event was found and | |
2162 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2163 | was found. Return the PID of the stopped child otherwise. */ | |
2164 | ||
2165 | static int | |
2166 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2167 | { | |
2168 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2169 | } |
2170 | ||
6bf5e0ba PA |
2171 | /* Count the LWP's that have had events. */ |
2172 | ||
2173 | static int | |
2174 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2175 | { | |
d86d4aaf | 2176 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2177 | int *count = data; |
2178 | ||
2179 | gdb_assert (count != NULL); | |
2180 | ||
582511be | 2181 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 PA |
2182 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2183 | && thread->last_resume_kind != resume_stop | |
582511be | 2184 | && thread->status_pending_p) |
6bf5e0ba PA |
2185 | (*count)++; |
2186 | ||
2187 | return 0; | |
2188 | } | |
2189 | ||
2190 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2191 | ||
2192 | static int | |
2193 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2194 | { | |
d86d4aaf DE |
2195 | struct thread_info *thread = (struct thread_info *) entry; |
2196 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2197 | |
8336d594 PA |
2198 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2199 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2200 | && lp->status_pending_p) |
2201 | return 1; | |
2202 | else | |
2203 | return 0; | |
2204 | } | |
2205 | ||
2206 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
2207 | reported to GDB. */ | |
2208 | ||
2209 | static int | |
2210 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2211 | { | |
d86d4aaf | 2212 | struct thread_info *thread = (struct thread_info *) entry; |
6bf5e0ba PA |
2213 | int *selector = data; |
2214 | ||
2215 | gdb_assert (selector != NULL); | |
2216 | ||
582511be | 2217 | /* Select only resumed LWPs that have an event pending. */ |
8336d594 PA |
2218 | if (thread->last_resume_kind != resume_stop |
2219 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
582511be | 2220 | && thread->status_pending_p) |
6bf5e0ba PA |
2221 | if ((*selector)-- == 0) |
2222 | return 1; | |
2223 | ||
2224 | return 0; | |
2225 | } | |
2226 | ||
6bf5e0ba PA |
2227 | /* Select one LWP out of those that have events pending. */ |
2228 | ||
2229 | static void | |
2230 | select_event_lwp (struct lwp_info **orig_lp) | |
2231 | { | |
2232 | int num_events = 0; | |
2233 | int random_selector; | |
582511be PA |
2234 | struct thread_info *event_thread = NULL; |
2235 | ||
2236 | /* In all-stop, give preference to the LWP that is being | |
2237 | single-stepped. There will be at most one, and it's the LWP that | |
2238 | the core is most interested in. If we didn't do this, then we'd | |
2239 | have to handle pending step SIGTRAPs somehow in case the core | |
2240 | later continues the previously-stepped thread, otherwise we'd | |
2241 | report the pending SIGTRAP, and the core, not having stepped the | |
2242 | thread, wouldn't understand what the trap was for, and therefore | |
2243 | would report it to the user as a random signal. */ | |
2244 | if (!non_stop) | |
6bf5e0ba | 2245 | { |
582511be PA |
2246 | event_thread |
2247 | = (struct thread_info *) find_inferior (&all_threads, | |
2248 | select_singlestep_lwp_callback, | |
2249 | NULL); | |
2250 | if (event_thread != NULL) | |
2251 | { | |
2252 | if (debug_threads) | |
2253 | debug_printf ("SEL: Select single-step %s\n", | |
2254 | target_pid_to_str (ptid_of (event_thread))); | |
2255 | } | |
6bf5e0ba | 2256 | } |
582511be | 2257 | if (event_thread == NULL) |
6bf5e0ba PA |
2258 | { |
2259 | /* No single-stepping LWP. Select one at random, out of those | |
2260 | which have had SIGTRAP events. */ | |
2261 | ||
2262 | /* First see how many SIGTRAP events we have. */ | |
d86d4aaf | 2263 | find_inferior (&all_threads, count_events_callback, &num_events); |
6bf5e0ba PA |
2264 | |
2265 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2266 | random_selector = (int) | |
2267 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2268 | ||
2269 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2270 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2271 | num_events, random_selector); | |
6bf5e0ba | 2272 | |
d86d4aaf DE |
2273 | event_thread |
2274 | = (struct thread_info *) find_inferior (&all_threads, | |
2275 | select_event_lwp_callback, | |
2276 | &random_selector); | |
6bf5e0ba PA |
2277 | } |
2278 | ||
d86d4aaf | 2279 | if (event_thread != NULL) |
6bf5e0ba | 2280 | { |
d86d4aaf DE |
2281 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2282 | ||
6bf5e0ba PA |
2283 | /* Switch the event LWP. */ |
2284 | *orig_lp = event_lp; | |
2285 | } | |
2286 | } | |
2287 | ||
7984d532 PA |
2288 | /* Decrement the suspend count of an LWP. */ |
2289 | ||
2290 | static int | |
2291 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2292 | { | |
d86d4aaf DE |
2293 | struct thread_info *thread = (struct thread_info *) entry; |
2294 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2295 | |
2296 | /* Ignore EXCEPT. */ | |
2297 | if (lwp == except) | |
2298 | return 0; | |
2299 | ||
2300 | lwp->suspended--; | |
2301 | ||
2302 | gdb_assert (lwp->suspended >= 0); | |
2303 | return 0; | |
2304 | } | |
2305 | ||
2306 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2307 | NULL. */ | |
2308 | ||
2309 | static void | |
2310 | unsuspend_all_lwps (struct lwp_info *except) | |
2311 | { | |
d86d4aaf | 2312 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2313 | } |
2314 | ||
fa593d66 PA |
2315 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2316 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2317 | void *data); | |
2318 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2319 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2320 | struct target_waitstatus *ourstatus, | |
2321 | int target_options); | |
2322 | ||
2323 | /* Stabilize threads (move out of jump pads). | |
2324 | ||
2325 | If a thread is midway collecting a fast tracepoint, we need to | |
2326 | finish the collection and move it out of the jump pad before | |
2327 | reporting the signal. | |
2328 | ||
2329 | This avoids recursion while collecting (when a signal arrives | |
2330 | midway, and the signal handler itself collects), which would trash | |
2331 | the trace buffer. In case the user set a breakpoint in a signal | |
2332 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2333 | Most importantly, there are certain things we can't do safely if | |
2334 | threads are stopped in a jump pad (or in its callee's). For | |
2335 | example: | |
2336 | ||
2337 | - starting a new trace run. A thread still collecting the | |
2338 | previous run, could trash the trace buffer when resumed. The trace | |
2339 | buffer control structures would have been reset but the thread had | |
2340 | no way to tell. The thread could even midway memcpy'ing to the | |
2341 | buffer, which would mean that when resumed, it would clobber the | |
2342 | trace buffer that had been set for a new run. | |
2343 | ||
2344 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2345 | safely. Say you do tstart while a thread is stopped midway while | |
2346 | collecting. When the thread is later resumed, it finishes the | |
2347 | collection, and returns to the jump pad, to execute the original | |
2348 | instruction that was under the tracepoint jump at the time the | |
2349 | older run had been started. If the jump pad had been rewritten | |
2350 | since for something else in the new run, the thread would now | |
2351 | execute the wrong / random instructions. */ | |
2352 | ||
2353 | static void | |
2354 | linux_stabilize_threads (void) | |
2355 | { | |
0bfdf32f | 2356 | struct thread_info *saved_thread; |
d86d4aaf | 2357 | struct thread_info *thread_stuck; |
fa593d66 | 2358 | |
d86d4aaf DE |
2359 | thread_stuck |
2360 | = (struct thread_info *) find_inferior (&all_threads, | |
2361 | stuck_in_jump_pad_callback, | |
2362 | NULL); | |
2363 | if (thread_stuck != NULL) | |
fa593d66 | 2364 | { |
b4d51a55 | 2365 | if (debug_threads) |
87ce2a04 | 2366 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2367 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2368 | return; |
2369 | } | |
2370 | ||
0bfdf32f | 2371 | saved_thread = current_thread; |
fa593d66 PA |
2372 | |
2373 | stabilizing_threads = 1; | |
2374 | ||
2375 | /* Kick 'em all. */ | |
d86d4aaf | 2376 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2377 | |
2378 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2379 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2380 | { |
2381 | struct target_waitstatus ourstatus; | |
2382 | struct lwp_info *lwp; | |
fa593d66 PA |
2383 | int wstat; |
2384 | ||
2385 | /* Note that we go through the full wait even loop. While | |
2386 | moving threads out of jump pad, we need to be able to step | |
2387 | over internal breakpoints and such. */ | |
32fcada3 | 2388 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2389 | |
2390 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2391 | { | |
0bfdf32f | 2392 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2393 | |
2394 | /* Lock it. */ | |
2395 | lwp->suspended++; | |
2396 | ||
a493e3e2 | 2397 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2398 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2399 | { |
2ea28649 | 2400 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2401 | enqueue_one_deferred_signal (lwp, &wstat); |
2402 | } | |
2403 | } | |
2404 | } | |
2405 | ||
d86d4aaf | 2406 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2407 | |
2408 | stabilizing_threads = 0; | |
2409 | ||
0bfdf32f | 2410 | current_thread = saved_thread; |
fa593d66 | 2411 | |
b4d51a55 | 2412 | if (debug_threads) |
fa593d66 | 2413 | { |
d86d4aaf DE |
2414 | thread_stuck |
2415 | = (struct thread_info *) find_inferior (&all_threads, | |
2416 | stuck_in_jump_pad_callback, | |
2417 | NULL); | |
2418 | if (thread_stuck != NULL) | |
87ce2a04 | 2419 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2420 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2421 | } |
2422 | } | |
2423 | ||
582511be PA |
2424 | static void async_file_mark (void); |
2425 | ||
2426 | /* Convenience function that is called when the kernel reports an | |
2427 | event that is not passed out to GDB. */ | |
2428 | ||
2429 | static ptid_t | |
2430 | ignore_event (struct target_waitstatus *ourstatus) | |
2431 | { | |
2432 | /* If we got an event, there may still be others, as a single | |
2433 | SIGCHLD can indicate more than one child stopped. This forces | |
2434 | another target_wait call. */ | |
2435 | async_file_mark (); | |
2436 | ||
2437 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2438 | return null_ptid; | |
2439 | } | |
2440 | ||
0d62e5e8 | 2441 | /* Wait for process, returns status. */ |
da6d8c04 | 2442 | |
95954743 PA |
2443 | static ptid_t |
2444 | linux_wait_1 (ptid_t ptid, | |
2445 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2446 | { |
e5f1222d | 2447 | int w; |
fc7238bb | 2448 | struct lwp_info *event_child; |
bd99dc85 | 2449 | int options; |
bd99dc85 | 2450 | int pid; |
6bf5e0ba PA |
2451 | int step_over_finished; |
2452 | int bp_explains_trap; | |
2453 | int maybe_internal_trap; | |
2454 | int report_to_gdb; | |
219f2f23 | 2455 | int trace_event; |
c2d6af84 | 2456 | int in_step_range; |
bd99dc85 | 2457 | |
87ce2a04 DE |
2458 | if (debug_threads) |
2459 | { | |
2460 | debug_enter (); | |
2461 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2462 | } | |
2463 | ||
bd99dc85 PA |
2464 | /* Translate generic target options into linux options. */ |
2465 | options = __WALL; | |
2466 | if (target_options & TARGET_WNOHANG) | |
2467 | options |= WNOHANG; | |
0d62e5e8 | 2468 | |
fa593d66 PA |
2469 | bp_explains_trap = 0; |
2470 | trace_event = 0; | |
c2d6af84 | 2471 | in_step_range = 0; |
bd99dc85 PA |
2472 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2473 | ||
6bf5e0ba PA |
2474 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2475 | pid = linux_wait_for_event (ptid, &w, options); | |
2476 | else | |
2477 | { | |
2478 | if (debug_threads) | |
87ce2a04 DE |
2479 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2480 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2481 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2482 | } | |
2483 | ||
fa96cb38 | 2484 | if (pid == 0) |
87ce2a04 | 2485 | { |
fa96cb38 PA |
2486 | gdb_assert (target_options & TARGET_WNOHANG); |
2487 | ||
87ce2a04 DE |
2488 | if (debug_threads) |
2489 | { | |
fa96cb38 PA |
2490 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2491 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2492 | debug_exit (); |
2493 | } | |
fa96cb38 PA |
2494 | |
2495 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2496 | return null_ptid; |
2497 | } | |
fa96cb38 PA |
2498 | else if (pid == -1) |
2499 | { | |
2500 | if (debug_threads) | |
2501 | { | |
2502 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2503 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2504 | debug_exit (); | |
2505 | } | |
bd99dc85 | 2506 | |
fa96cb38 PA |
2507 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2508 | return null_ptid; | |
2509 | } | |
0d62e5e8 | 2510 | |
0bfdf32f | 2511 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2512 | |
fa96cb38 PA |
2513 | /* linux_wait_for_event only returns an exit status for the last |
2514 | child of a process. Report it. */ | |
2515 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2516 | { |
fa96cb38 | 2517 | if (WIFEXITED (w)) |
0d62e5e8 | 2518 | { |
fa96cb38 PA |
2519 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2520 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2521 | |
fa96cb38 | 2522 | if (debug_threads) |
bd99dc85 | 2523 | { |
fa96cb38 PA |
2524 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2525 | "retcode %d\n", | |
0bfdf32f | 2526 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2527 | WEXITSTATUS (w)); |
2528 | debug_exit (); | |
bd99dc85 | 2529 | } |
fa96cb38 PA |
2530 | } |
2531 | else | |
2532 | { | |
2533 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2534 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2535 | |
fa96cb38 PA |
2536 | if (debug_threads) |
2537 | { | |
2538 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2539 | "signal %d\n", | |
0bfdf32f | 2540 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2541 | WTERMSIG (w)); |
2542 | debug_exit (); | |
2543 | } | |
0d62e5e8 | 2544 | } |
fa96cb38 | 2545 | |
0bfdf32f | 2546 | return ptid_of (current_thread); |
da6d8c04 DJ |
2547 | } |
2548 | ||
8090aef2 PA |
2549 | /* If step-over executes a breakpoint instruction, it means a |
2550 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2551 | breakpoint. The PC has been adjusted by | |
2552 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2553 | Advance the PC manually past the breakpoint, otherwise the | |
2554 | program would keep trapping the permanent breakpoint forever. */ | |
2555 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
2556 | && event_child->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT) | |
2557 | { | |
9beb7c4e | 2558 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2559 | |
2560 | if (debug_threads) | |
2561 | { | |
2562 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2563 | target_pid_to_str (ptid_of (current_thread))); | |
2564 | } | |
2565 | ||
2566 | if (increment_pc != 0) | |
2567 | { | |
2568 | struct regcache *regcache | |
2569 | = get_thread_regcache (current_thread, 1); | |
2570 | ||
2571 | event_child->stop_pc += increment_pc; | |
2572 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2573 | ||
2574 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
2575 | event_child->stop_reason = LWP_STOPPED_BY_NO_REASON; | |
2576 | } | |
2577 | } | |
2578 | ||
6bf5e0ba PA |
2579 | /* If this event was not handled before, and is not a SIGTRAP, we |
2580 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2581 | a breakpoint is inserted at the current PC. If this target does | |
2582 | not support internal breakpoints at all, we also report the | |
2583 | SIGTRAP without further processing; it's of no concern to us. */ | |
2584 | maybe_internal_trap | |
2585 | = (supports_breakpoints () | |
2586 | && (WSTOPSIG (w) == SIGTRAP | |
2587 | || ((WSTOPSIG (w) == SIGILL | |
2588 | || WSTOPSIG (w) == SIGSEGV) | |
2589 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2590 | ||
2591 | if (maybe_internal_trap) | |
2592 | { | |
2593 | /* Handle anything that requires bookkeeping before deciding to | |
2594 | report the event or continue waiting. */ | |
2595 | ||
2596 | /* First check if we can explain the SIGTRAP with an internal | |
2597 | breakpoint, or if we should possibly report the event to GDB. | |
2598 | Do this before anything that may remove or insert a | |
2599 | breakpoint. */ | |
2600 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2601 | ||
2602 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2603 | finished. If so, tweak the state machine accordingly, | |
2604 | reinsert breakpoints and delete any reinsert (software | |
2605 | single-step) breakpoints. */ | |
2606 | step_over_finished = finish_step_over (event_child); | |
2607 | ||
2608 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2609 | check_breakpoints (event_child->stop_pc); | |
2610 | ||
219f2f23 PA |
2611 | /* Handle tracepoint data collecting. This may overflow the |
2612 | trace buffer, and cause a tracing stop, removing | |
2613 | breakpoints. */ | |
2614 | trace_event = handle_tracepoints (event_child); | |
2615 | ||
6bf5e0ba PA |
2616 | if (bp_explains_trap) |
2617 | { | |
2618 | /* If we stepped or ran into an internal breakpoint, we've | |
2619 | already handled it. So next time we resume (from this | |
2620 | PC), we should step over it. */ | |
2621 | if (debug_threads) | |
87ce2a04 | 2622 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2623 | |
8b07ae33 PA |
2624 | if (breakpoint_here (event_child->stop_pc)) |
2625 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2626 | } |
2627 | } | |
2628 | else | |
2629 | { | |
2630 | /* We have some other signal, possibly a step-over dance was in | |
2631 | progress, and it should be cancelled too. */ | |
2632 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2633 | } |
2634 | ||
2635 | /* We have all the data we need. Either report the event to GDB, or | |
2636 | resume threads and keep waiting for more. */ | |
2637 | ||
2638 | /* If we're collecting a fast tracepoint, finish the collection and | |
2639 | move out of the jump pad before delivering a signal. See | |
2640 | linux_stabilize_threads. */ | |
2641 | ||
2642 | if (WIFSTOPPED (w) | |
2643 | && WSTOPSIG (w) != SIGTRAP | |
2644 | && supports_fast_tracepoints () | |
58b4daa5 | 2645 | && agent_loaded_p ()) |
fa593d66 PA |
2646 | { |
2647 | if (debug_threads) | |
87ce2a04 DE |
2648 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2649 | "to defer or adjust it.\n", | |
0bfdf32f | 2650 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2651 | |
2652 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2653 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2654 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2655 | { | |
2656 | enqueue_one_deferred_signal (event_child, &w); | |
2657 | ||
2658 | if (debug_threads) | |
87ce2a04 | 2659 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2660 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2661 | |
2662 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2663 | |
2664 | return ignore_event (ourstatus); | |
fa593d66 PA |
2665 | } |
2666 | } | |
219f2f23 | 2667 | |
fa593d66 PA |
2668 | if (event_child->collecting_fast_tracepoint) |
2669 | { | |
2670 | if (debug_threads) | |
87ce2a04 DE |
2671 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2672 | "Check if we're already there.\n", | |
0bfdf32f | 2673 | lwpid_of (current_thread), |
87ce2a04 | 2674 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2675 | |
2676 | trace_event = 1; | |
2677 | ||
2678 | event_child->collecting_fast_tracepoint | |
2679 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2680 | ||
2681 | if (event_child->collecting_fast_tracepoint != 1) | |
2682 | { | |
2683 | /* No longer need this breakpoint. */ | |
2684 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2685 | { | |
2686 | if (debug_threads) | |
87ce2a04 DE |
2687 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2688 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2689 | |
2690 | /* Other running threads could hit this breakpoint. | |
2691 | We don't handle moribund locations like GDB does, | |
2692 | instead we always pause all threads when removing | |
2693 | breakpoints, so that any step-over or | |
2694 | decr_pc_after_break adjustment is always taken | |
2695 | care of while the breakpoint is still | |
2696 | inserted. */ | |
2697 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
2698 | |
2699 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2700 | event_child->exit_jump_pad_bkpt = NULL; | |
2701 | ||
2702 | unstop_all_lwps (1, event_child); | |
2703 | ||
2704 | gdb_assert (event_child->suspended >= 0); | |
2705 | } | |
2706 | } | |
2707 | ||
2708 | if (event_child->collecting_fast_tracepoint == 0) | |
2709 | { | |
2710 | if (debug_threads) | |
87ce2a04 DE |
2711 | debug_printf ("fast tracepoint finished " |
2712 | "collecting successfully.\n"); | |
fa593d66 PA |
2713 | |
2714 | /* We may have a deferred signal to report. */ | |
2715 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2716 | { | |
2717 | if (debug_threads) | |
87ce2a04 | 2718 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2719 | } |
3c11dd79 | 2720 | else |
fa593d66 | 2721 | { |
3c11dd79 | 2722 | if (debug_threads) |
87ce2a04 | 2723 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2724 | |
2725 | if (stabilizing_threads) | |
2726 | { | |
2727 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2728 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2729 | |
2730 | if (debug_threads) | |
2731 | { | |
2732 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2733 | "while stabilizing threads\n", | |
0bfdf32f | 2734 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
2735 | debug_exit (); |
2736 | } | |
2737 | ||
0bfdf32f | 2738 | return ptid_of (current_thread); |
fa593d66 PA |
2739 | } |
2740 | } | |
2741 | } | |
6bf5e0ba PA |
2742 | } |
2743 | ||
e471f25b PA |
2744 | /* Check whether GDB would be interested in this event. */ |
2745 | ||
2746 | /* If GDB is not interested in this signal, don't stop other | |
2747 | threads, and don't report it to GDB. Just resume the inferior | |
2748 | right away. We do this for threading-related signals as well as | |
2749 | any that GDB specifically requested we ignore. But never ignore | |
2750 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2751 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
2752 | handler. Also never ignore signals that could be caused by a |
2753 | breakpoint. */ | |
e471f25b PA |
2754 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
2755 | thread library? */ | |
2756 | if (WIFSTOPPED (w) | |
0bfdf32f | 2757 | && current_thread->last_resume_kind != resume_step |
e471f25b | 2758 | && ( |
1a981360 | 2759 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2760 | (current_process ()->private->thread_db != NULL |
2761 | && (WSTOPSIG (w) == __SIGRTMIN | |
2762 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2763 | || | |
2764 | #endif | |
2ea28649 | 2765 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 2766 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
2767 | && current_thread->last_resume_kind == resume_stop) |
2768 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
2769 | { |
2770 | siginfo_t info, *info_p; | |
2771 | ||
2772 | if (debug_threads) | |
87ce2a04 | 2773 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 2774 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 2775 | |
0bfdf32f | 2776 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2777 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2778 | info_p = &info; |
2779 | else | |
2780 | info_p = NULL; | |
2781 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2782 | WSTOPSIG (w), info_p); | |
582511be | 2783 | return ignore_event (ourstatus); |
e471f25b PA |
2784 | } |
2785 | ||
c2d6af84 PA |
2786 | /* Note that all addresses are always "out of the step range" when |
2787 | there's no range to begin with. */ | |
2788 | in_step_range = lwp_in_step_range (event_child); | |
2789 | ||
2790 | /* If GDB wanted this thread to single step, and the thread is out | |
2791 | of the step range, we always want to report the SIGTRAP, and let | |
2792 | GDB handle it. Watchpoints should always be reported. So should | |
2793 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2794 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2795 | do, we're be able to handle GDB breakpoints on top of internal | |
2796 | breakpoints, by handling the internal breakpoint and still | |
2797 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2798 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2799 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 2800 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 2801 | && !in_step_range) |
582511be | 2802 | || event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
c2d6af84 | 2803 | || (!step_over_finished && !in_step_range |
493e2a69 | 2804 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2805 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2806 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2807 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2808 | ||
2809 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2810 | |
2811 | /* We found no reason GDB would want us to stop. We either hit one | |
2812 | of our own breakpoints, or finished an internal step GDB | |
2813 | shouldn't know about. */ | |
2814 | if (!report_to_gdb) | |
2815 | { | |
2816 | if (debug_threads) | |
2817 | { | |
2818 | if (bp_explains_trap) | |
87ce2a04 | 2819 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2820 | if (step_over_finished) |
87ce2a04 | 2821 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2822 | if (trace_event) |
87ce2a04 | 2823 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2824 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2825 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2826 | paddress (event_child->stop_pc), | |
2827 | paddress (event_child->step_range_start), | |
2828 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2829 | } |
2830 | ||
2831 | /* We're not reporting this breakpoint to GDB, so apply the | |
2832 | decr_pc_after_break adjustment to the inferior's regcache | |
2833 | ourselves. */ | |
2834 | ||
2835 | if (the_low_target.set_pc != NULL) | |
2836 | { | |
2837 | struct regcache *regcache | |
0bfdf32f | 2838 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
2839 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2840 | } | |
2841 | ||
7984d532 PA |
2842 | /* We may have finished stepping over a breakpoint. If so, |
2843 | we've stopped and suspended all LWPs momentarily except the | |
2844 | stepping one. This is where we resume them all again. We're | |
2845 | going to keep waiting, so use proceed, which handles stepping | |
2846 | over the next breakpoint. */ | |
6bf5e0ba | 2847 | if (debug_threads) |
87ce2a04 | 2848 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2849 | |
2850 | if (step_over_finished) | |
2851 | unsuspend_all_lwps (event_child); | |
2852 | ||
6bf5e0ba | 2853 | proceed_all_lwps (); |
582511be | 2854 | return ignore_event (ourstatus); |
6bf5e0ba PA |
2855 | } |
2856 | ||
2857 | if (debug_threads) | |
2858 | { | |
0bfdf32f | 2859 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
2860 | { |
2861 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2862 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2863 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2864 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2865 | } |
582511be | 2866 | if (event_child->stop_reason == LWP_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 2867 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 2868 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2869 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2870 | if (debug_threads) |
87ce2a04 | 2871 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2872 | } |
2873 | ||
2874 | /* Alright, we're going to report a stop. */ | |
2875 | ||
582511be | 2876 | if (!stabilizing_threads) |
6bf5e0ba PA |
2877 | { |
2878 | /* In all-stop, stop all threads. */ | |
582511be PA |
2879 | if (!non_stop) |
2880 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
2881 | |
2882 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2883 | from among those that have had events. Giving equal priority | |
2884 | to all LWPs that have had events helps prevent | |
2885 | starvation. */ | |
2886 | if (ptid_equal (ptid, minus_one_ptid)) | |
2887 | { | |
2888 | event_child->status_pending_p = 1; | |
2889 | event_child->status_pending = w; | |
2890 | ||
2891 | select_event_lwp (&event_child); | |
2892 | ||
0bfdf32f GB |
2893 | /* current_thread and event_child must stay in sync. */ |
2894 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 2895 | |
6bf5e0ba PA |
2896 | event_child->status_pending_p = 0; |
2897 | w = event_child->status_pending; | |
2898 | } | |
2899 | ||
c03e6ccc | 2900 | if (step_over_finished) |
582511be PA |
2901 | { |
2902 | if (!non_stop) | |
2903 | { | |
2904 | /* If we were doing a step-over, all other threads but | |
2905 | the stepping one had been paused in start_step_over, | |
2906 | with their suspend counts incremented. We don't want | |
2907 | to do a full unstop/unpause, because we're in | |
2908 | all-stop mode (so we want threads stopped), but we | |
2909 | still need to unsuspend the other threads, to | |
2910 | decrement their `suspended' count back. */ | |
2911 | unsuspend_all_lwps (event_child); | |
2912 | } | |
2913 | else | |
2914 | { | |
2915 | /* If we just finished a step-over, then all threads had | |
2916 | been momentarily paused. In all-stop, that's fine, | |
2917 | we want threads stopped by now anyway. In non-stop, | |
2918 | we need to re-resume threads that GDB wanted to be | |
2919 | running. */ | |
2920 | unstop_all_lwps (1, event_child); | |
2921 | } | |
2922 | } | |
c03e6ccc | 2923 | |
fa593d66 | 2924 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
2925 | if (!non_stop) |
2926 | stabilize_threads (); | |
6bf5e0ba PA |
2927 | } |
2928 | else | |
2929 | { | |
2930 | /* If we just finished a step-over, then all threads had been | |
2931 | momentarily paused. In all-stop, that's fine, we want | |
2932 | threads stopped by now anyway. In non-stop, we need to | |
2933 | re-resume threads that GDB wanted to be running. */ | |
2934 | if (step_over_finished) | |
7984d532 | 2935 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2936 | } |
2937 | ||
5b1c542e | 2938 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2939 | |
582511be PA |
2940 | /* Now that we've selected our final event LWP, un-adjust its PC if |
2941 | it was a software breakpoint. */ | |
2942 | if (event_child->stop_reason == LWP_STOPPED_BY_SW_BREAKPOINT) | |
2943 | { | |
2944 | int decr_pc = the_low_target.decr_pc_after_break; | |
2945 | ||
2946 | if (decr_pc != 0) | |
2947 | { | |
2948 | struct regcache *regcache | |
2949 | = get_thread_regcache (current_thread, 1); | |
2950 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
2951 | } | |
2952 | } | |
2953 | ||
0bfdf32f | 2954 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2955 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
2956 | { |
2957 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2958 | and it stopped cleanly, so report as SIG0. The use of | |
2959 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2960 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2961 | } |
0bfdf32f | 2962 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 2963 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
2964 | { |
2965 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2966 | but, it stopped for other reasons. */ |
2ea28649 | 2967 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2968 | } |
2969 | else | |
2970 | { | |
2ea28649 | 2971 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2972 | } |
2973 | ||
d50171e4 PA |
2974 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2975 | ||
bd99dc85 | 2976 | if (debug_threads) |
87ce2a04 DE |
2977 | { |
2978 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 2979 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
2980 | ourstatus->kind, ourstatus->value.sig); |
2981 | debug_exit (); | |
2982 | } | |
bd99dc85 | 2983 | |
0bfdf32f | 2984 | return ptid_of (current_thread); |
bd99dc85 PA |
2985 | } |
2986 | ||
2987 | /* Get rid of any pending event in the pipe. */ | |
2988 | static void | |
2989 | async_file_flush (void) | |
2990 | { | |
2991 | int ret; | |
2992 | char buf; | |
2993 | ||
2994 | do | |
2995 | ret = read (linux_event_pipe[0], &buf, 1); | |
2996 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2997 | } | |
2998 | ||
2999 | /* Put something in the pipe, so the event loop wakes up. */ | |
3000 | static void | |
3001 | async_file_mark (void) | |
3002 | { | |
3003 | int ret; | |
3004 | ||
3005 | async_file_flush (); | |
3006 | ||
3007 | do | |
3008 | ret = write (linux_event_pipe[1], "+", 1); | |
3009 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3010 | ||
3011 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3012 | be awakened anyway. */ | |
3013 | } | |
3014 | ||
95954743 PA |
3015 | static ptid_t |
3016 | linux_wait (ptid_t ptid, | |
3017 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3018 | { |
95954743 | 3019 | ptid_t event_ptid; |
bd99dc85 | 3020 | |
bd99dc85 PA |
3021 | /* Flush the async file first. */ |
3022 | if (target_is_async_p ()) | |
3023 | async_file_flush (); | |
3024 | ||
582511be PA |
3025 | do |
3026 | { | |
3027 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3028 | } | |
3029 | while ((target_options & TARGET_WNOHANG) == 0 | |
3030 | && ptid_equal (event_ptid, null_ptid) | |
3031 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3032 | |
3033 | /* If at least one stop was reported, there may be more. A single | |
3034 | SIGCHLD can signal more than one child stop. */ | |
3035 | if (target_is_async_p () | |
3036 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3037 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3038 | async_file_mark (); |
3039 | ||
3040 | return event_ptid; | |
da6d8c04 DJ |
3041 | } |
3042 | ||
c5f62d5f | 3043 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3044 | |
3045 | static int | |
a1928bad | 3046 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3047 | { |
c5f62d5f DE |
3048 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3049 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3050 | |
c5f62d5f DE |
3051 | #ifdef __NR_tkill |
3052 | { | |
3053 | static int tkill_failed; | |
fd500816 | 3054 | |
c5f62d5f DE |
3055 | if (!tkill_failed) |
3056 | { | |
3057 | int ret; | |
3058 | ||
3059 | errno = 0; | |
3060 | ret = syscall (__NR_tkill, lwpid, signo); | |
3061 | if (errno != ENOSYS) | |
3062 | return ret; | |
3063 | tkill_failed = 1; | |
3064 | } | |
3065 | } | |
fd500816 DJ |
3066 | #endif |
3067 | ||
3068 | return kill (lwpid, signo); | |
3069 | } | |
3070 | ||
964e4306 PA |
3071 | void |
3072 | linux_stop_lwp (struct lwp_info *lwp) | |
3073 | { | |
3074 | send_sigstop (lwp); | |
3075 | } | |
3076 | ||
0d62e5e8 | 3077 | static void |
02fc4de7 | 3078 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3079 | { |
bd99dc85 | 3080 | int pid; |
0d62e5e8 | 3081 | |
d86d4aaf | 3082 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3083 | |
0d62e5e8 DJ |
3084 | /* If we already have a pending stop signal for this process, don't |
3085 | send another. */ | |
54a0b537 | 3086 | if (lwp->stop_expected) |
0d62e5e8 | 3087 | { |
ae13219e | 3088 | if (debug_threads) |
87ce2a04 | 3089 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3090 | |
0d62e5e8 DJ |
3091 | return; |
3092 | } | |
3093 | ||
3094 | if (debug_threads) | |
87ce2a04 | 3095 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3096 | |
d50171e4 | 3097 | lwp->stop_expected = 1; |
bd99dc85 | 3098 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3099 | } |
3100 | ||
7984d532 PA |
3101 | static int |
3102 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3103 | { |
d86d4aaf DE |
3104 | struct thread_info *thread = (struct thread_info *) entry; |
3105 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3106 | |
7984d532 PA |
3107 | /* Ignore EXCEPT. */ |
3108 | if (lwp == except) | |
3109 | return 0; | |
3110 | ||
02fc4de7 | 3111 | if (lwp->stopped) |
7984d532 | 3112 | return 0; |
02fc4de7 PA |
3113 | |
3114 | send_sigstop (lwp); | |
7984d532 PA |
3115 | return 0; |
3116 | } | |
3117 | ||
3118 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3119 | yet. */ | |
3120 | static int | |
3121 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3122 | void *except) | |
3123 | { | |
d86d4aaf DE |
3124 | struct thread_info *thread = (struct thread_info *) entry; |
3125 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3126 | |
3127 | /* Ignore EXCEPT. */ | |
3128 | if (lwp == except) | |
3129 | return 0; | |
3130 | ||
3131 | lwp->suspended++; | |
3132 | ||
3133 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3134 | } |
3135 | ||
95954743 PA |
3136 | static void |
3137 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3138 | { | |
3139 | /* It's dead, really. */ | |
3140 | lwp->dead = 1; | |
3141 | ||
3142 | /* Store the exit status for later. */ | |
3143 | lwp->status_pending_p = 1; | |
3144 | lwp->status_pending = wstat; | |
3145 | ||
95954743 PA |
3146 | /* Prevent trying to stop it. */ |
3147 | lwp->stopped = 1; | |
3148 | ||
3149 | /* No further stops are expected from a dead lwp. */ | |
3150 | lwp->stop_expected = 0; | |
3151 | } | |
3152 | ||
fa96cb38 PA |
3153 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3154 | ||
0d62e5e8 | 3155 | static void |
fa96cb38 | 3156 | wait_for_sigstop (void) |
0d62e5e8 | 3157 | { |
0bfdf32f | 3158 | struct thread_info *saved_thread; |
95954743 | 3159 | ptid_t saved_tid; |
fa96cb38 PA |
3160 | int wstat; |
3161 | int ret; | |
0d62e5e8 | 3162 | |
0bfdf32f GB |
3163 | saved_thread = current_thread; |
3164 | if (saved_thread != NULL) | |
3165 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3166 | else |
95954743 | 3167 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3168 | |
d50171e4 | 3169 | if (debug_threads) |
fa96cb38 | 3170 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3171 | |
fa96cb38 PA |
3172 | /* Passing NULL_PTID as filter indicates we want all events to be |
3173 | left pending. Eventually this returns when there are no | |
3174 | unwaited-for children left. */ | |
3175 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3176 | &wstat, __WALL); | |
3177 | gdb_assert (ret == -1); | |
0d62e5e8 | 3178 | |
0bfdf32f GB |
3179 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3180 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3181 | else |
3182 | { | |
3183 | if (debug_threads) | |
87ce2a04 | 3184 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3185 | |
bd99dc85 PA |
3186 | if (non_stop) |
3187 | { | |
3188 | /* We can't change the current inferior behind GDB's back, | |
3189 | otherwise, a subsequent command may apply to the wrong | |
3190 | process. */ | |
0bfdf32f | 3191 | current_thread = NULL; |
bd99dc85 PA |
3192 | } |
3193 | else | |
3194 | { | |
3195 | /* Set a valid thread as current. */ | |
0bfdf32f | 3196 | set_desired_thread (0); |
bd99dc85 | 3197 | } |
0d62e5e8 DJ |
3198 | } |
3199 | } | |
3200 | ||
fa593d66 PA |
3201 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3202 | move it out, because we need to report the stop event to GDB. For | |
3203 | example, if the user puts a breakpoint in the jump pad, it's | |
3204 | because she wants to debug it. */ | |
3205 | ||
3206 | static int | |
3207 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3208 | { | |
d86d4aaf DE |
3209 | struct thread_info *thread = (struct thread_info *) entry; |
3210 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3211 | |
3212 | gdb_assert (lwp->suspended == 0); | |
3213 | gdb_assert (lwp->stopped); | |
3214 | ||
3215 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3216 | return (supports_fast_tracepoints () | |
58b4daa5 | 3217 | && agent_loaded_p () |
fa593d66 | 3218 | && (gdb_breakpoint_here (lwp->stop_pc) |
582511be | 3219 | || lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3220 | || thread->last_resume_kind == resume_step) |
3221 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3222 | } | |
3223 | ||
3224 | static void | |
3225 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3226 | { | |
d86d4aaf DE |
3227 | struct thread_info *thread = (struct thread_info *) entry; |
3228 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3229 | int *wstat; |
3230 | ||
3231 | gdb_assert (lwp->suspended == 0); | |
3232 | gdb_assert (lwp->stopped); | |
3233 | ||
3234 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3235 | ||
3236 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3237 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
582511be | 3238 | && lwp->stop_reason != LWP_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3239 | && thread->last_resume_kind != resume_step |
3240 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3241 | { | |
3242 | if (debug_threads) | |
87ce2a04 | 3243 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3244 | lwpid_of (thread)); |
fa593d66 PA |
3245 | |
3246 | if (wstat) | |
3247 | { | |
3248 | lwp->status_pending_p = 0; | |
3249 | enqueue_one_deferred_signal (lwp, wstat); | |
3250 | ||
3251 | if (debug_threads) | |
87ce2a04 DE |
3252 | debug_printf ("Signal %d for LWP %ld deferred " |
3253 | "(in jump pad)\n", | |
d86d4aaf | 3254 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3255 | } |
3256 | ||
3257 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3258 | } | |
3259 | else | |
3260 | lwp->suspended++; | |
3261 | } | |
3262 | ||
3263 | static int | |
3264 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3265 | { | |
d86d4aaf DE |
3266 | struct thread_info *thread = (struct thread_info *) entry; |
3267 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3268 | |
3269 | if (lwp->dead) | |
3270 | return 0; | |
3271 | if (lwp->stopped) | |
3272 | return 0; | |
3273 | return 1; | |
3274 | } | |
3275 | ||
7984d532 PA |
3276 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3277 | If SUSPEND, then also increase the suspend count of every LWP, | |
3278 | except EXCEPT. */ | |
3279 | ||
0d62e5e8 | 3280 | static void |
7984d532 | 3281 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3282 | { |
bde24c0a PA |
3283 | /* Should not be called recursively. */ |
3284 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3285 | ||
87ce2a04 DE |
3286 | if (debug_threads) |
3287 | { | |
3288 | debug_enter (); | |
3289 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3290 | suspend ? "stop-and-suspend" : "stop", | |
3291 | except != NULL | |
d86d4aaf | 3292 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3293 | : "none"); |
3294 | } | |
3295 | ||
bde24c0a PA |
3296 | stopping_threads = (suspend |
3297 | ? STOPPING_AND_SUSPENDING_THREADS | |
3298 | : STOPPING_THREADS); | |
7984d532 PA |
3299 | |
3300 | if (suspend) | |
d86d4aaf | 3301 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3302 | else |
d86d4aaf | 3303 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3304 | wait_for_sigstop (); |
bde24c0a | 3305 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3306 | |
3307 | if (debug_threads) | |
3308 | { | |
3309 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3310 | "back to !stopping\n"); | |
3311 | debug_exit (); | |
3312 | } | |
0d62e5e8 DJ |
3313 | } |
3314 | ||
da6d8c04 DJ |
3315 | /* Resume execution of the inferior process. |
3316 | If STEP is nonzero, single-step it. | |
3317 | If SIGNAL is nonzero, give it that signal. */ | |
3318 | ||
ce3a066d | 3319 | static void |
2acc282a | 3320 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3321 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3322 | { |
d86d4aaf | 3323 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3324 | struct thread_info *saved_thread; |
fa593d66 | 3325 | int fast_tp_collecting; |
0d62e5e8 | 3326 | |
54a0b537 | 3327 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3328 | return; |
3329 | ||
fa593d66 PA |
3330 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3331 | ||
3332 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3333 | ||
219f2f23 PA |
3334 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3335 | user used the "jump" command, or "set $pc = foo"). */ | |
3336 | if (lwp->stop_pc != get_pc (lwp)) | |
3337 | { | |
3338 | /* Collecting 'while-stepping' actions doesn't make sense | |
3339 | anymore. */ | |
d86d4aaf | 3340 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3341 | } |
3342 | ||
0d62e5e8 DJ |
3343 | /* If we have pending signals or status, and a new signal, enqueue the |
3344 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3345 | breakpoint; it will be picked up again below. */ | |
3346 | if (signal != 0 | |
fa593d66 PA |
3347 | && (lwp->status_pending_p |
3348 | || lwp->pending_signals != NULL | |
3349 | || lwp->bp_reinsert != 0 | |
3350 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3351 | { |
3352 | struct pending_signals *p_sig; | |
bca929d3 | 3353 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3354 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3355 | p_sig->signal = signal; |
32ca6d61 DJ |
3356 | if (info == NULL) |
3357 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3358 | else | |
3359 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3360 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3361 | } |
3362 | ||
d50171e4 PA |
3363 | if (lwp->status_pending_p) |
3364 | { | |
3365 | if (debug_threads) | |
87ce2a04 DE |
3366 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3367 | " has pending status\n", | |
d86d4aaf | 3368 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3369 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3370 | return; |
3371 | } | |
0d62e5e8 | 3372 | |
0bfdf32f GB |
3373 | saved_thread = current_thread; |
3374 | current_thread = thread; | |
0d62e5e8 DJ |
3375 | |
3376 | if (debug_threads) | |
87ce2a04 | 3377 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3378 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3379 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3380 | |
3381 | /* This bit needs some thinking about. If we get a signal that | |
3382 | we must report while a single-step reinsert is still pending, | |
3383 | we often end up resuming the thread. It might be better to | |
3384 | (ew) allow a stack of pending events; then we could be sure that | |
3385 | the reinsert happened right away and not lose any signals. | |
3386 | ||
3387 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3388 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3389 | complete correctness, so it won't solve that problem. It may be |
3390 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3391 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3392 | { |
3393 | if (debug_threads) | |
87ce2a04 DE |
3394 | debug_printf (" pending reinsert at 0x%s\n", |
3395 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3396 | |
85e00e85 | 3397 | if (can_hardware_single_step ()) |
d50171e4 | 3398 | { |
fa593d66 PA |
3399 | if (fast_tp_collecting == 0) |
3400 | { | |
3401 | if (step == 0) | |
3402 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3403 | if (lwp->suspended) | |
3404 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3405 | lwp->suspended); | |
3406 | } | |
d50171e4 PA |
3407 | |
3408 | step = 1; | |
3409 | } | |
0d62e5e8 DJ |
3410 | |
3411 | /* Postpone any pending signal. It was enqueued above. */ | |
3412 | signal = 0; | |
3413 | } | |
3414 | ||
fa593d66 PA |
3415 | if (fast_tp_collecting == 1) |
3416 | { | |
3417 | if (debug_threads) | |
87ce2a04 DE |
3418 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3419 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3420 | lwpid_of (thread)); |
fa593d66 PA |
3421 | |
3422 | /* Postpone any pending signal. It was enqueued above. */ | |
3423 | signal = 0; | |
3424 | } | |
3425 | else if (fast_tp_collecting == 2) | |
3426 | { | |
3427 | if (debug_threads) | |
87ce2a04 DE |
3428 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3429 | " single-stepping\n", | |
d86d4aaf | 3430 | lwpid_of (thread)); |
fa593d66 PA |
3431 | |
3432 | if (can_hardware_single_step ()) | |
3433 | step = 1; | |
3434 | else | |
38e08fca GB |
3435 | { |
3436 | internal_error (__FILE__, __LINE__, | |
3437 | "moving out of jump pad single-stepping" | |
3438 | " not implemented on this target"); | |
3439 | } | |
fa593d66 PA |
3440 | |
3441 | /* Postpone any pending signal. It was enqueued above. */ | |
3442 | signal = 0; | |
3443 | } | |
3444 | ||
219f2f23 PA |
3445 | /* If we have while-stepping actions in this thread set it stepping. |
3446 | If we have a signal to deliver, it may or may not be set to | |
3447 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3448 | while-stepping into a signal handler. A possible smart thing to | |
3449 | do would be to set an internal breakpoint at the signal return | |
3450 | address, continue, and carry on catching this while-stepping | |
3451 | action only when that breakpoint is hit. A future | |
3452 | enhancement. */ | |
d86d4aaf | 3453 | if (thread->while_stepping != NULL |
219f2f23 PA |
3454 | && can_hardware_single_step ()) |
3455 | { | |
3456 | if (debug_threads) | |
87ce2a04 | 3457 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3458 | lwpid_of (thread)); |
219f2f23 PA |
3459 | step = 1; |
3460 | } | |
3461 | ||
582511be | 3462 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3463 | { |
0bfdf32f | 3464 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3465 | |
3466 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3467 | ||
3468 | if (debug_threads) | |
3469 | { | |
3470 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3471 | (long) lwp->stop_pc); | |
3472 | } | |
0d62e5e8 DJ |
3473 | } |
3474 | ||
fa593d66 PA |
3475 | /* If we have pending signals, consume one unless we are trying to |
3476 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3477 | collect. */ | |
3478 | if (lwp->pending_signals != NULL | |
3479 | && lwp->bp_reinsert == 0 | |
3480 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3481 | { |
3482 | struct pending_signals **p_sig; | |
3483 | ||
54a0b537 | 3484 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3485 | while ((*p_sig)->prev != NULL) |
3486 | p_sig = &(*p_sig)->prev; | |
3487 | ||
3488 | signal = (*p_sig)->signal; | |
32ca6d61 | 3489 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3490 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3491 | &(*p_sig)->info); |
32ca6d61 | 3492 | |
0d62e5e8 DJ |
3493 | free (*p_sig); |
3494 | *p_sig = NULL; | |
3495 | } | |
3496 | ||
aa5ca48f DE |
3497 | if (the_low_target.prepare_to_resume != NULL) |
3498 | the_low_target.prepare_to_resume (lwp); | |
3499 | ||
d86d4aaf | 3500 | regcache_invalidate_thread (thread); |
da6d8c04 | 3501 | errno = 0; |
54a0b537 | 3502 | lwp->stopped = 0; |
582511be | 3503 | lwp->stop_reason = LWP_STOPPED_BY_NO_REASON; |
54a0b537 | 3504 | lwp->stepping = step; |
d86d4aaf | 3505 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3506 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3507 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3508 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3509 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3510 | |
0bfdf32f | 3511 | current_thread = saved_thread; |
da6d8c04 | 3512 | if (errno) |
3221518c UW |
3513 | { |
3514 | /* ESRCH from ptrace either means that the thread was already | |
3515 | running (an error) or that it is gone (a race condition). If | |
3516 | it's gone, we will get a notification the next time we wait, | |
3517 | so we can ignore the error. We could differentiate these | |
3518 | two, but it's tricky without waiting; the thread still exists | |
3519 | as a zombie, so sending it signal 0 would succeed. So just | |
3520 | ignore ESRCH. */ | |
3521 | if (errno == ESRCH) | |
3522 | return; | |
3523 | ||
3524 | perror_with_name ("ptrace"); | |
3525 | } | |
da6d8c04 DJ |
3526 | } |
3527 | ||
2bd7c093 PA |
3528 | struct thread_resume_array |
3529 | { | |
3530 | struct thread_resume *resume; | |
3531 | size_t n; | |
3532 | }; | |
64386c31 | 3533 | |
ebcf782c DE |
3534 | /* This function is called once per thread via find_inferior. |
3535 | ARG is a pointer to a thread_resume_array struct. | |
3536 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3537 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3538 | |
3539 | This algorithm is O(threads * resume elements), but resume elements | |
3540 | is small (and will remain small at least until GDB supports thread | |
3541 | suspension). */ | |
ebcf782c | 3542 | |
2bd7c093 PA |
3543 | static int |
3544 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3545 | { |
d86d4aaf DE |
3546 | struct thread_info *thread = (struct thread_info *) entry; |
3547 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3548 | int ndx; |
2bd7c093 | 3549 | struct thread_resume_array *r; |
64386c31 | 3550 | |
2bd7c093 | 3551 | r = arg; |
64386c31 | 3552 | |
2bd7c093 | 3553 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3554 | { |
3555 | ptid_t ptid = r->resume[ndx].thread; | |
3556 | if (ptid_equal (ptid, minus_one_ptid) | |
3557 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3558 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3559 | of PID'. */ | |
d86d4aaf | 3560 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3561 | && (ptid_is_pid (ptid) |
3562 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3563 | { |
d50171e4 | 3564 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3565 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3566 | { |
3567 | if (debug_threads) | |
87ce2a04 DE |
3568 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3569 | (thread->last_status.kind | |
3570 | == TARGET_WAITKIND_STOPPED) | |
3571 | ? "stopped" | |
3572 | : "stopping", | |
d86d4aaf | 3573 | lwpid_of (thread)); |
d50171e4 PA |
3574 | |
3575 | continue; | |
3576 | } | |
3577 | ||
95954743 | 3578 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3579 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3580 | |
c2d6af84 PA |
3581 | lwp->step_range_start = lwp->resume->step_range_start; |
3582 | lwp->step_range_end = lwp->resume->step_range_end; | |
3583 | ||
fa593d66 PA |
3584 | /* If we had a deferred signal to report, dequeue one now. |
3585 | This can happen if LWP gets more than one signal while | |
3586 | trying to get out of a jump pad. */ | |
3587 | if (lwp->stopped | |
3588 | && !lwp->status_pending_p | |
3589 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3590 | { | |
3591 | lwp->status_pending_p = 1; | |
3592 | ||
3593 | if (debug_threads) | |
87ce2a04 DE |
3594 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3595 | "leaving status pending.\n", | |
d86d4aaf DE |
3596 | WSTOPSIG (lwp->status_pending), |
3597 | lwpid_of (thread)); | |
fa593d66 PA |
3598 | } |
3599 | ||
95954743 PA |
3600 | return 0; |
3601 | } | |
3602 | } | |
2bd7c093 PA |
3603 | |
3604 | /* No resume action for this thread. */ | |
3605 | lwp->resume = NULL; | |
64386c31 | 3606 | |
2bd7c093 | 3607 | return 0; |
5544ad89 DJ |
3608 | } |
3609 | ||
20ad9378 DE |
3610 | /* find_inferior callback for linux_resume. |
3611 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3612 | |
bd99dc85 PA |
3613 | static int |
3614 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3615 | { |
d86d4aaf DE |
3616 | struct thread_info *thread = (struct thread_info *) entry; |
3617 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3618 | |
bd99dc85 PA |
3619 | /* LWPs which will not be resumed are not interesting, because |
3620 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3621 | if (lwp->resume == NULL) |
bd99dc85 | 3622 | return 0; |
64386c31 | 3623 | |
582511be | 3624 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
3625 | * (int *) flag_p = 1; |
3626 | ||
3627 | return 0; | |
3628 | } | |
3629 | ||
3630 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3631 | internal breakpoint that we need to step over. It assumes that any | |
3632 | required STOP_PC adjustment has already been propagated to the | |
3633 | inferior's regcache. */ | |
3634 | ||
3635 | static int | |
3636 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3637 | { | |
d86d4aaf DE |
3638 | struct thread_info *thread = (struct thread_info *) entry; |
3639 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 3640 | struct thread_info *saved_thread; |
d50171e4 PA |
3641 | CORE_ADDR pc; |
3642 | ||
3643 | /* LWPs which will not be resumed are not interesting, because we | |
3644 | might not wait for them next time through linux_wait. */ | |
3645 | ||
3646 | if (!lwp->stopped) | |
3647 | { | |
3648 | if (debug_threads) | |
87ce2a04 | 3649 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3650 | lwpid_of (thread)); |
d50171e4 PA |
3651 | return 0; |
3652 | } | |
3653 | ||
8336d594 | 3654 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3655 | { |
3656 | if (debug_threads) | |
87ce2a04 DE |
3657 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3658 | " stopped\n", | |
d86d4aaf | 3659 | lwpid_of (thread)); |
d50171e4 PA |
3660 | return 0; |
3661 | } | |
3662 | ||
7984d532 PA |
3663 | gdb_assert (lwp->suspended >= 0); |
3664 | ||
3665 | if (lwp->suspended) | |
3666 | { | |
3667 | if (debug_threads) | |
87ce2a04 | 3668 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3669 | lwpid_of (thread)); |
7984d532 PA |
3670 | return 0; |
3671 | } | |
3672 | ||
d50171e4 PA |
3673 | if (!lwp->need_step_over) |
3674 | { | |
3675 | if (debug_threads) | |
d86d4aaf | 3676 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3677 | } |
5544ad89 | 3678 | |
bd99dc85 | 3679 | if (lwp->status_pending_p) |
d50171e4 PA |
3680 | { |
3681 | if (debug_threads) | |
87ce2a04 DE |
3682 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3683 | " status.\n", | |
d86d4aaf | 3684 | lwpid_of (thread)); |
d50171e4 PA |
3685 | return 0; |
3686 | } | |
3687 | ||
3688 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3689 | or we have. */ | |
3690 | pc = get_pc (lwp); | |
3691 | ||
3692 | /* If the PC has changed since we stopped, then don't do anything, | |
3693 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3694 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3695 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3696 | command, or poked thread's registers herself. */ | |
3697 | if (pc != lwp->stop_pc) | |
3698 | { | |
3699 | if (debug_threads) | |
87ce2a04 DE |
3700 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3701 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3702 | lwpid_of (thread), |
3703 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3704 | |
3705 | lwp->need_step_over = 0; | |
3706 | return 0; | |
3707 | } | |
3708 | ||
0bfdf32f GB |
3709 | saved_thread = current_thread; |
3710 | current_thread = thread; | |
d50171e4 | 3711 | |
8b07ae33 | 3712 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3713 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3714 | { |
8b07ae33 | 3715 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3716 | though. If the condition is being evaluated on the target's side |
3717 | and it evaluate to false, step over this breakpoint as well. */ | |
3718 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3719 | && gdb_condition_true_at_breakpoint (pc) |
3720 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3721 | { |
3722 | if (debug_threads) | |
87ce2a04 DE |
3723 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3724 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3725 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3726 | |
0bfdf32f | 3727 | current_thread = saved_thread; |
8b07ae33 PA |
3728 | return 0; |
3729 | } | |
3730 | else | |
3731 | { | |
3732 | if (debug_threads) | |
87ce2a04 DE |
3733 | debug_printf ("Need step over [LWP %ld]? yes, " |
3734 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3735 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3736 | |
8b07ae33 PA |
3737 | /* We've found an lwp that needs stepping over --- return 1 so |
3738 | that find_inferior stops looking. */ | |
0bfdf32f | 3739 | current_thread = saved_thread; |
8b07ae33 PA |
3740 | |
3741 | /* If the step over is cancelled, this is set again. */ | |
3742 | lwp->need_step_over = 0; | |
3743 | return 1; | |
3744 | } | |
d50171e4 PA |
3745 | } |
3746 | ||
0bfdf32f | 3747 | current_thread = saved_thread; |
d50171e4 PA |
3748 | |
3749 | if (debug_threads) | |
87ce2a04 DE |
3750 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3751 | " at 0x%s\n", | |
d86d4aaf | 3752 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3753 | |
bd99dc85 | 3754 | return 0; |
5544ad89 DJ |
3755 | } |
3756 | ||
d50171e4 PA |
3757 | /* Start a step-over operation on LWP. When LWP stopped at a |
3758 | breakpoint, to make progress, we need to remove the breakpoint out | |
3759 | of the way. If we let other threads run while we do that, they may | |
3760 | pass by the breakpoint location and miss hitting it. To avoid | |
3761 | that, a step-over momentarily stops all threads while LWP is | |
3762 | single-stepped while the breakpoint is temporarily uninserted from | |
3763 | the inferior. When the single-step finishes, we reinsert the | |
3764 | breakpoint, and let all threads that are supposed to be running, | |
3765 | run again. | |
3766 | ||
3767 | On targets that don't support hardware single-step, we don't | |
3768 | currently support full software single-stepping. Instead, we only | |
3769 | support stepping over the thread event breakpoint, by asking the | |
3770 | low target where to place a reinsert breakpoint. Since this | |
3771 | routine assumes the breakpoint being stepped over is a thread event | |
3772 | breakpoint, it usually assumes the return address of the current | |
3773 | function is a good enough place to set the reinsert breakpoint. */ | |
3774 | ||
3775 | static int | |
3776 | start_step_over (struct lwp_info *lwp) | |
3777 | { | |
d86d4aaf | 3778 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3779 | struct thread_info *saved_thread; |
d50171e4 PA |
3780 | CORE_ADDR pc; |
3781 | int step; | |
3782 | ||
3783 | if (debug_threads) | |
87ce2a04 | 3784 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3785 | lwpid_of (thread)); |
d50171e4 | 3786 | |
7984d532 PA |
3787 | stop_all_lwps (1, lwp); |
3788 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3789 | |
3790 | if (debug_threads) | |
87ce2a04 | 3791 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3792 | |
3793 | /* Note, we should always reach here with an already adjusted PC, | |
3794 | either by GDB (if we're resuming due to GDB's request), or by our | |
3795 | caller, if we just finished handling an internal breakpoint GDB | |
3796 | shouldn't care about. */ | |
3797 | pc = get_pc (lwp); | |
3798 | ||
0bfdf32f GB |
3799 | saved_thread = current_thread; |
3800 | current_thread = thread; | |
d50171e4 PA |
3801 | |
3802 | lwp->bp_reinsert = pc; | |
3803 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3804 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3805 | |
3806 | if (can_hardware_single_step ()) | |
3807 | { | |
3808 | step = 1; | |
3809 | } | |
3810 | else | |
3811 | { | |
3812 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3813 | set_reinsert_breakpoint (raddr); | |
3814 | step = 0; | |
3815 | } | |
3816 | ||
0bfdf32f | 3817 | current_thread = saved_thread; |
d50171e4 PA |
3818 | |
3819 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3820 | ||
3821 | /* Require next event from this LWP. */ | |
d86d4aaf | 3822 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3823 | return 1; |
3824 | } | |
3825 | ||
3826 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3827 | start_step_over, if still there, and delete any reinsert | |
3828 | breakpoints we've set, on non hardware single-step targets. */ | |
3829 | ||
3830 | static int | |
3831 | finish_step_over (struct lwp_info *lwp) | |
3832 | { | |
3833 | if (lwp->bp_reinsert != 0) | |
3834 | { | |
3835 | if (debug_threads) | |
87ce2a04 | 3836 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3837 | |
3838 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3839 | may be no breakpoint to reinsert there by now. */ | |
3840 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3841 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3842 | |
3843 | lwp->bp_reinsert = 0; | |
3844 | ||
3845 | /* Delete any software-single-step reinsert breakpoints. No | |
3846 | longer needed. We don't have to worry about other threads | |
3847 | hitting this trap, and later not being able to explain it, | |
3848 | because we were stepping over a breakpoint, and we hold all | |
3849 | threads but LWP stopped while doing that. */ | |
3850 | if (!can_hardware_single_step ()) | |
3851 | delete_reinsert_breakpoints (); | |
3852 | ||
3853 | step_over_bkpt = null_ptid; | |
3854 | return 1; | |
3855 | } | |
3856 | else | |
3857 | return 0; | |
3858 | } | |
3859 | ||
5544ad89 DJ |
3860 | /* This function is called once per thread. We check the thread's resume |
3861 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3862 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3863 | |
bd99dc85 PA |
3864 | For threads which we aren't explicitly told otherwise, we preserve |
3865 | the stepping flag; this is used for stepping over gdbserver-placed | |
3866 | breakpoints. | |
3867 | ||
3868 | If pending_flags was set in any thread, we queue any needed | |
3869 | signals, since we won't actually resume. We already have a pending | |
3870 | event to report, so we don't need to preserve any step requests; | |
3871 | they should be re-issued if necessary. */ | |
3872 | ||
3873 | static int | |
3874 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3875 | { |
d86d4aaf DE |
3876 | struct thread_info *thread = (struct thread_info *) entry; |
3877 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3878 | int step; |
d50171e4 PA |
3879 | int leave_all_stopped = * (int *) arg; |
3880 | int leave_pending; | |
5544ad89 | 3881 | |
2bd7c093 | 3882 | if (lwp->resume == NULL) |
bd99dc85 | 3883 | return 0; |
5544ad89 | 3884 | |
bd99dc85 | 3885 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3886 | { |
bd99dc85 | 3887 | if (debug_threads) |
d86d4aaf | 3888 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
3889 | |
3890 | if (!lwp->stopped) | |
3891 | { | |
3892 | if (debug_threads) | |
d86d4aaf | 3893 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 3894 | |
d50171e4 PA |
3895 | /* Stop the thread, and wait for the event asynchronously, |
3896 | through the event loop. */ | |
02fc4de7 | 3897 | send_sigstop (lwp); |
bd99dc85 PA |
3898 | } |
3899 | else | |
3900 | { | |
3901 | if (debug_threads) | |
87ce2a04 | 3902 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 3903 | lwpid_of (thread)); |
d50171e4 PA |
3904 | |
3905 | /* The LWP may have been stopped in an internal event that | |
3906 | was not meant to be notified back to GDB (e.g., gdbserver | |
3907 | breakpoint), so we should be reporting a stop event in | |
3908 | this case too. */ | |
3909 | ||
3910 | /* If the thread already has a pending SIGSTOP, this is a | |
3911 | no-op. Otherwise, something later will presumably resume | |
3912 | the thread and this will cause it to cancel any pending | |
3913 | operation, due to last_resume_kind == resume_stop. If | |
3914 | the thread already has a pending status to report, we | |
3915 | will still report it the next time we wait - see | |
3916 | status_pending_p_callback. */ | |
1a981360 PA |
3917 | |
3918 | /* If we already have a pending signal to report, then | |
3919 | there's no need to queue a SIGSTOP, as this means we're | |
3920 | midway through moving the LWP out of the jumppad, and we | |
3921 | will report the pending signal as soon as that is | |
3922 | finished. */ | |
3923 | if (lwp->pending_signals_to_report == NULL) | |
3924 | send_sigstop (lwp); | |
bd99dc85 | 3925 | } |
32ca6d61 | 3926 | |
bd99dc85 PA |
3927 | /* For stop requests, we're done. */ |
3928 | lwp->resume = NULL; | |
fc7238bb | 3929 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3930 | return 0; |
5544ad89 DJ |
3931 | } |
3932 | ||
bd99dc85 PA |
3933 | /* If this thread which is about to be resumed has a pending status, |
3934 | then don't resume any threads - we can just report the pending | |
3935 | status. Make sure to queue any signals that would otherwise be | |
3936 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3937 | thread has a pending status. If there's a thread that needs the |
3938 | step-over-breakpoint dance, then don't resume any other thread | |
3939 | but that particular one. */ | |
3940 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3941 | |
d50171e4 | 3942 | if (!leave_pending) |
bd99dc85 PA |
3943 | { |
3944 | if (debug_threads) | |
d86d4aaf | 3945 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 3946 | |
d50171e4 | 3947 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3948 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3949 | } |
3950 | else | |
3951 | { | |
3952 | if (debug_threads) | |
d86d4aaf | 3953 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 3954 | |
bd99dc85 PA |
3955 | /* If we have a new signal, enqueue the signal. */ |
3956 | if (lwp->resume->sig != 0) | |
3957 | { | |
3958 | struct pending_signals *p_sig; | |
3959 | p_sig = xmalloc (sizeof (*p_sig)); | |
3960 | p_sig->prev = lwp->pending_signals; | |
3961 | p_sig->signal = lwp->resume->sig; | |
3962 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3963 | ||
3964 | /* If this is the same signal we were previously stopped by, | |
3965 | make sure to queue its siginfo. We can ignore the return | |
3966 | value of ptrace; if it fails, we'll skip | |
3967 | PTRACE_SETSIGINFO. */ | |
3968 | if (WIFSTOPPED (lwp->last_status) | |
3969 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 3970 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3971 | &p_sig->info); |
bd99dc85 PA |
3972 | |
3973 | lwp->pending_signals = p_sig; | |
3974 | } | |
3975 | } | |
5544ad89 | 3976 | |
fc7238bb | 3977 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3978 | lwp->resume = NULL; |
5544ad89 | 3979 | return 0; |
0d62e5e8 DJ |
3980 | } |
3981 | ||
3982 | static void | |
2bd7c093 | 3983 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3984 | { |
2bd7c093 | 3985 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 3986 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
3987 | int any_pending; |
3988 | int leave_all_stopped; | |
c6ecbae5 | 3989 | |
87ce2a04 DE |
3990 | if (debug_threads) |
3991 | { | |
3992 | debug_enter (); | |
3993 | debug_printf ("linux_resume:\n"); | |
3994 | } | |
3995 | ||
2bd7c093 | 3996 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3997 | |
d50171e4 PA |
3998 | /* If there is a thread which would otherwise be resumed, which has |
3999 | a pending status, then don't resume any threads - we can just | |
4000 | report the pending status. Make sure to queue any signals that | |
4001 | would otherwise be sent. In non-stop mode, we'll apply this | |
4002 | logic to each thread individually. We consume all pending events | |
4003 | before considering to start a step-over (in all-stop). */ | |
4004 | any_pending = 0; | |
bd99dc85 | 4005 | if (!non_stop) |
d86d4aaf | 4006 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4007 | |
4008 | /* If there is a thread which would otherwise be resumed, which is | |
4009 | stopped at a breakpoint that needs stepping over, then don't | |
4010 | resume any threads - have it step over the breakpoint with all | |
4011 | other threads stopped, then resume all threads again. Make sure | |
4012 | to queue any signals that would otherwise be delivered or | |
4013 | queued. */ | |
4014 | if (!any_pending && supports_breakpoints ()) | |
4015 | need_step_over | |
d86d4aaf DE |
4016 | = (struct thread_info *) find_inferior (&all_threads, |
4017 | need_step_over_p, NULL); | |
d50171e4 PA |
4018 | |
4019 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4020 | ||
4021 | if (debug_threads) | |
4022 | { | |
4023 | if (need_step_over != NULL) | |
87ce2a04 | 4024 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4025 | else if (any_pending) |
87ce2a04 DE |
4026 | debug_printf ("Not resuming, all-stop and found " |
4027 | "an LWP with pending status\n"); | |
d50171e4 | 4028 | else |
87ce2a04 | 4029 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4030 | } |
4031 | ||
4032 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4033 | otherwise deliver. */ | |
4034 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4035 | ||
4036 | if (need_step_over) | |
d86d4aaf | 4037 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4038 | |
4039 | if (debug_threads) | |
4040 | { | |
4041 | debug_printf ("linux_resume done\n"); | |
4042 | debug_exit (); | |
4043 | } | |
d50171e4 PA |
4044 | } |
4045 | ||
4046 | /* This function is called once per thread. We check the thread's | |
4047 | last resume request, which will tell us whether to resume, step, or | |
4048 | leave the thread stopped. Any signal the client requested to be | |
4049 | delivered has already been enqueued at this point. | |
4050 | ||
4051 | If any thread that GDB wants running is stopped at an internal | |
4052 | breakpoint that needs stepping over, we start a step-over operation | |
4053 | on that particular thread, and leave all others stopped. */ | |
4054 | ||
7984d532 PA |
4055 | static int |
4056 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4057 | { |
d86d4aaf DE |
4058 | struct thread_info *thread = (struct thread_info *) entry; |
4059 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4060 | int step; |
4061 | ||
7984d532 PA |
4062 | if (lwp == except) |
4063 | return 0; | |
d50171e4 PA |
4064 | |
4065 | if (debug_threads) | |
d86d4aaf | 4066 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4067 | |
4068 | if (!lwp->stopped) | |
4069 | { | |
4070 | if (debug_threads) | |
d86d4aaf | 4071 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4072 | return 0; |
d50171e4 PA |
4073 | } |
4074 | ||
02fc4de7 PA |
4075 | if (thread->last_resume_kind == resume_stop |
4076 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4077 | { |
4078 | if (debug_threads) | |
87ce2a04 | 4079 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4080 | lwpid_of (thread)); |
7984d532 | 4081 | return 0; |
d50171e4 PA |
4082 | } |
4083 | ||
4084 | if (lwp->status_pending_p) | |
4085 | { | |
4086 | if (debug_threads) | |
87ce2a04 | 4087 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4088 | lwpid_of (thread)); |
7984d532 | 4089 | return 0; |
d50171e4 PA |
4090 | } |
4091 | ||
7984d532 PA |
4092 | gdb_assert (lwp->suspended >= 0); |
4093 | ||
d50171e4 PA |
4094 | if (lwp->suspended) |
4095 | { | |
4096 | if (debug_threads) | |
d86d4aaf | 4097 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4098 | return 0; |
d50171e4 PA |
4099 | } |
4100 | ||
1a981360 PA |
4101 | if (thread->last_resume_kind == resume_stop |
4102 | && lwp->pending_signals_to_report == NULL | |
4103 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4104 | { |
4105 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4106 | last_status.kind check above would catch it, and we wouldn't | |
4107 | reach here. This LWP may have been momentarily paused by a | |
4108 | stop_all_lwps call while handling for example, another LWP's | |
4109 | step-over. In that case, the pending expected SIGSTOP signal | |
4110 | that was queued at vCont;t handling time will have already | |
4111 | been consumed by wait_for_sigstop, and so we need to requeue | |
4112 | another one here. Note that if the LWP already has a SIGSTOP | |
4113 | pending, this is a no-op. */ | |
4114 | ||
4115 | if (debug_threads) | |
87ce2a04 DE |
4116 | debug_printf ("Client wants LWP %ld to stop. " |
4117 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4118 | lwpid_of (thread)); |
02fc4de7 PA |
4119 | |
4120 | send_sigstop (lwp); | |
4121 | } | |
4122 | ||
8336d594 | 4123 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4124 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4125 | return 0; |
4126 | } | |
4127 | ||
4128 | static int | |
4129 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4130 | { | |
d86d4aaf DE |
4131 | struct thread_info *thread = (struct thread_info *) entry; |
4132 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4133 | |
4134 | if (lwp == except) | |
4135 | return 0; | |
4136 | ||
4137 | lwp->suspended--; | |
4138 | gdb_assert (lwp->suspended >= 0); | |
4139 | ||
4140 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4141 | } |
4142 | ||
4143 | /* When we finish a step-over, set threads running again. If there's | |
4144 | another thread that may need a step-over, now's the time to start | |
4145 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4146 | ||
4147 | static void | |
4148 | proceed_all_lwps (void) | |
4149 | { | |
d86d4aaf | 4150 | struct thread_info *need_step_over; |
d50171e4 PA |
4151 | |
4152 | /* If there is a thread which would otherwise be resumed, which is | |
4153 | stopped at a breakpoint that needs stepping over, then don't | |
4154 | resume any threads - have it step over the breakpoint with all | |
4155 | other threads stopped, then resume all threads again. */ | |
4156 | ||
4157 | if (supports_breakpoints ()) | |
4158 | { | |
4159 | need_step_over | |
d86d4aaf DE |
4160 | = (struct thread_info *) find_inferior (&all_threads, |
4161 | need_step_over_p, NULL); | |
d50171e4 PA |
4162 | |
4163 | if (need_step_over != NULL) | |
4164 | { | |
4165 | if (debug_threads) | |
87ce2a04 DE |
4166 | debug_printf ("proceed_all_lwps: found " |
4167 | "thread %ld needing a step-over\n", | |
4168 | lwpid_of (need_step_over)); | |
d50171e4 | 4169 | |
d86d4aaf | 4170 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4171 | return; |
4172 | } | |
4173 | } | |
5544ad89 | 4174 | |
d50171e4 | 4175 | if (debug_threads) |
87ce2a04 | 4176 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4177 | |
d86d4aaf | 4178 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4179 | } |
4180 | ||
4181 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4182 | pending statuses, are set to run again, except for EXCEPT, if not | |
4183 | NULL. This undoes a stop_all_lwps call. */ | |
4184 | ||
4185 | static void | |
7984d532 | 4186 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4187 | { |
5544ad89 DJ |
4188 | if (debug_threads) |
4189 | { | |
87ce2a04 | 4190 | debug_enter (); |
d50171e4 | 4191 | if (except) |
87ce2a04 | 4192 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4193 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4194 | else |
87ce2a04 | 4195 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4196 | } |
4197 | ||
7984d532 | 4198 | if (unsuspend) |
d86d4aaf | 4199 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4200 | else |
d86d4aaf | 4201 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4202 | |
4203 | if (debug_threads) | |
4204 | { | |
4205 | debug_printf ("unstop_all_lwps done\n"); | |
4206 | debug_exit (); | |
4207 | } | |
0d62e5e8 DJ |
4208 | } |
4209 | ||
58caa3dc DJ |
4210 | |
4211 | #ifdef HAVE_LINUX_REGSETS | |
4212 | ||
1faeff08 MR |
4213 | #define use_linux_regsets 1 |
4214 | ||
030031ee PA |
4215 | /* Returns true if REGSET has been disabled. */ |
4216 | ||
4217 | static int | |
4218 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4219 | { | |
4220 | return (info->disabled_regsets != NULL | |
4221 | && info->disabled_regsets[regset - info->regsets]); | |
4222 | } | |
4223 | ||
4224 | /* Disable REGSET. */ | |
4225 | ||
4226 | static void | |
4227 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4228 | { | |
4229 | int dr_offset; | |
4230 | ||
4231 | dr_offset = regset - info->regsets; | |
4232 | if (info->disabled_regsets == NULL) | |
4233 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4234 | info->disabled_regsets[dr_offset] = 1; | |
4235 | } | |
4236 | ||
58caa3dc | 4237 | static int |
3aee8918 PA |
4238 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4239 | struct regcache *regcache) | |
58caa3dc DJ |
4240 | { |
4241 | struct regset_info *regset; | |
e9d25b98 | 4242 | int saw_general_regs = 0; |
95954743 | 4243 | int pid; |
1570b33e | 4244 | struct iovec iov; |
58caa3dc | 4245 | |
0bfdf32f | 4246 | pid = lwpid_of (current_thread); |
28eef672 | 4247 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4248 | { |
1570b33e L |
4249 | void *buf, *data; |
4250 | int nt_type, res; | |
58caa3dc | 4251 | |
030031ee | 4252 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4253 | continue; |
58caa3dc | 4254 | |
bca929d3 | 4255 | buf = xmalloc (regset->size); |
1570b33e L |
4256 | |
4257 | nt_type = regset->nt_type; | |
4258 | if (nt_type) | |
4259 | { | |
4260 | iov.iov_base = buf; | |
4261 | iov.iov_len = regset->size; | |
4262 | data = (void *) &iov; | |
4263 | } | |
4264 | else | |
4265 | data = buf; | |
4266 | ||
dfb64f85 | 4267 | #ifndef __sparc__ |
f15f9948 | 4268 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4269 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4270 | #else |
1570b33e | 4271 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4272 | #endif |
58caa3dc DJ |
4273 | if (res < 0) |
4274 | { | |
4275 | if (errno == EIO) | |
4276 | { | |
52fa2412 | 4277 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4278 | this process mode. */ |
030031ee | 4279 | disable_regset (regsets_info, regset); |
58caa3dc | 4280 | } |
e5a9158d AA |
4281 | else if (errno == ENODATA) |
4282 | { | |
4283 | /* ENODATA may be returned if the regset is currently | |
4284 | not "active". This can happen in normal operation, | |
4285 | so suppress the warning in this case. */ | |
4286 | } | |
58caa3dc DJ |
4287 | else |
4288 | { | |
0d62e5e8 | 4289 | char s[256]; |
95954743 PA |
4290 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4291 | pid); | |
0d62e5e8 | 4292 | perror (s); |
58caa3dc DJ |
4293 | } |
4294 | } | |
098dbe61 AA |
4295 | else |
4296 | { | |
4297 | if (regset->type == GENERAL_REGS) | |
4298 | saw_general_regs = 1; | |
4299 | regset->store_function (regcache, buf); | |
4300 | } | |
fdeb2a12 | 4301 | free (buf); |
58caa3dc | 4302 | } |
e9d25b98 DJ |
4303 | if (saw_general_regs) |
4304 | return 0; | |
4305 | else | |
4306 | return 1; | |
58caa3dc DJ |
4307 | } |
4308 | ||
4309 | static int | |
3aee8918 PA |
4310 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4311 | struct regcache *regcache) | |
58caa3dc DJ |
4312 | { |
4313 | struct regset_info *regset; | |
e9d25b98 | 4314 | int saw_general_regs = 0; |
95954743 | 4315 | int pid; |
1570b33e | 4316 | struct iovec iov; |
58caa3dc | 4317 | |
0bfdf32f | 4318 | pid = lwpid_of (current_thread); |
28eef672 | 4319 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4320 | { |
1570b33e L |
4321 | void *buf, *data; |
4322 | int nt_type, res; | |
58caa3dc | 4323 | |
feea5f36 AA |
4324 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4325 | || regset->fill_function == NULL) | |
28eef672 | 4326 | continue; |
58caa3dc | 4327 | |
bca929d3 | 4328 | buf = xmalloc (regset->size); |
545587ee DJ |
4329 | |
4330 | /* First fill the buffer with the current register set contents, | |
4331 | in case there are any items in the kernel's regset that are | |
4332 | not in gdbserver's regcache. */ | |
1570b33e L |
4333 | |
4334 | nt_type = regset->nt_type; | |
4335 | if (nt_type) | |
4336 | { | |
4337 | iov.iov_base = buf; | |
4338 | iov.iov_len = regset->size; | |
4339 | data = (void *) &iov; | |
4340 | } | |
4341 | else | |
4342 | data = buf; | |
4343 | ||
dfb64f85 | 4344 | #ifndef __sparc__ |
f15f9948 | 4345 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4346 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4347 | #else |
689cc2ae | 4348 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4349 | #endif |
545587ee DJ |
4350 | |
4351 | if (res == 0) | |
4352 | { | |
4353 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4354 | regset->fill_function (regcache, buf); |
545587ee DJ |
4355 | |
4356 | /* Only now do we write the register set. */ | |
dfb64f85 | 4357 | #ifndef __sparc__ |
f15f9948 | 4358 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4359 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4360 | #else |
1570b33e | 4361 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4362 | #endif |
545587ee DJ |
4363 | } |
4364 | ||
58caa3dc DJ |
4365 | if (res < 0) |
4366 | { | |
4367 | if (errno == EIO) | |
4368 | { | |
52fa2412 | 4369 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4370 | this process mode. */ |
030031ee | 4371 | disable_regset (regsets_info, regset); |
58caa3dc | 4372 | } |
3221518c UW |
4373 | else if (errno == ESRCH) |
4374 | { | |
1b3f6016 PA |
4375 | /* At this point, ESRCH should mean the process is |
4376 | already gone, in which case we simply ignore attempts | |
4377 | to change its registers. See also the related | |
4378 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4379 | free (buf); |
3221518c UW |
4380 | return 0; |
4381 | } | |
58caa3dc DJ |
4382 | else |
4383 | { | |
ce3a066d | 4384 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4385 | } |
4386 | } | |
e9d25b98 DJ |
4387 | else if (regset->type == GENERAL_REGS) |
4388 | saw_general_regs = 1; | |
09ec9b38 | 4389 | free (buf); |
58caa3dc | 4390 | } |
e9d25b98 DJ |
4391 | if (saw_general_regs) |
4392 | return 0; | |
4393 | else | |
4394 | return 1; | |
58caa3dc DJ |
4395 | } |
4396 | ||
1faeff08 | 4397 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4398 | |
1faeff08 | 4399 | #define use_linux_regsets 0 |
3aee8918 PA |
4400 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4401 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4402 | |
58caa3dc | 4403 | #endif |
1faeff08 MR |
4404 | |
4405 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4406 | calls or 0 if it has to be transferred individually. */ | |
4407 | ||
4408 | static int | |
3aee8918 | 4409 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4410 | { |
4411 | unsigned char mask = 1 << (regno % 8); | |
4412 | size_t index = regno / 8; | |
4413 | ||
4414 | return (use_linux_regsets | |
3aee8918 PA |
4415 | && (regs_info->regset_bitmap == NULL |
4416 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4417 | } |
4418 | ||
58caa3dc | 4419 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4420 | |
4421 | int | |
3aee8918 | 4422 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4423 | { |
4424 | int addr; | |
4425 | ||
3aee8918 | 4426 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4427 | error ("Invalid register number %d.", regnum); |
4428 | ||
3aee8918 | 4429 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4430 | |
4431 | return addr; | |
4432 | } | |
4433 | ||
4434 | /* Fetch one register. */ | |
4435 | static void | |
3aee8918 PA |
4436 | fetch_register (const struct usrregs_info *usrregs, |
4437 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4438 | { |
4439 | CORE_ADDR regaddr; | |
4440 | int i, size; | |
4441 | char *buf; | |
4442 | int pid; | |
4443 | ||
3aee8918 | 4444 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4445 | return; |
4446 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4447 | return; | |
4448 | ||
3aee8918 | 4449 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4450 | if (regaddr == -1) |
4451 | return; | |
4452 | ||
3aee8918 PA |
4453 | size = ((register_size (regcache->tdesc, regno) |
4454 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4455 | & -sizeof (PTRACE_XFER_TYPE)); |
4456 | buf = alloca (size); | |
4457 | ||
0bfdf32f | 4458 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4459 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4460 | { | |
4461 | errno = 0; | |
4462 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4463 | ptrace (PTRACE_PEEKUSER, pid, | |
4464 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4465 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4466 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4467 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4468 | if (errno != 0) | |
4469 | error ("reading register %d: %s", regno, strerror (errno)); | |
4470 | } | |
4471 | ||
4472 | if (the_low_target.supply_ptrace_register) | |
4473 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4474 | else | |
4475 | supply_register (regcache, regno, buf); | |
4476 | } | |
4477 | ||
4478 | /* Store one register. */ | |
4479 | static void | |
3aee8918 PA |
4480 | store_register (const struct usrregs_info *usrregs, |
4481 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4482 | { |
4483 | CORE_ADDR regaddr; | |
4484 | int i, size; | |
4485 | char *buf; | |
4486 | int pid; | |
4487 | ||
3aee8918 | 4488 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4489 | return; |
4490 | if ((*the_low_target.cannot_store_register) (regno)) | |
4491 | return; | |
4492 | ||
3aee8918 | 4493 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4494 | if (regaddr == -1) |
4495 | return; | |
4496 | ||
3aee8918 PA |
4497 | size = ((register_size (regcache->tdesc, regno) |
4498 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4499 | & -sizeof (PTRACE_XFER_TYPE)); |
4500 | buf = alloca (size); | |
4501 | memset (buf, 0, size); | |
4502 | ||
4503 | if (the_low_target.collect_ptrace_register) | |
4504 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4505 | else | |
4506 | collect_register (regcache, regno, buf); | |
4507 | ||
0bfdf32f | 4508 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4509 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4510 | { | |
4511 | errno = 0; | |
4512 | ptrace (PTRACE_POKEUSER, pid, | |
4513 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4514 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4515 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4516 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4517 | if (errno != 0) |
4518 | { | |
4519 | /* At this point, ESRCH should mean the process is | |
4520 | already gone, in which case we simply ignore attempts | |
4521 | to change its registers. See also the related | |
4522 | comment in linux_resume_one_lwp. */ | |
4523 | if (errno == ESRCH) | |
4524 | return; | |
4525 | ||
4526 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4527 | error ("writing register %d: %s", regno, strerror (errno)); | |
4528 | } | |
4529 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4530 | } | |
4531 | } | |
4532 | ||
4533 | /* Fetch all registers, or just one, from the child process. | |
4534 | If REGNO is -1, do this for all registers, skipping any that are | |
4535 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4536 | unless ALL is non-zero. | |
4537 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4538 | static void | |
3aee8918 PA |
4539 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4540 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4541 | { |
3aee8918 PA |
4542 | struct usrregs_info *usr = regs_info->usrregs; |
4543 | ||
1faeff08 MR |
4544 | if (regno == -1) |
4545 | { | |
3aee8918 PA |
4546 | for (regno = 0; regno < usr->num_regs; regno++) |
4547 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4548 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4549 | } |
4550 | else | |
3aee8918 | 4551 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4552 | } |
4553 | ||
4554 | /* Store our register values back into the inferior. | |
4555 | If REGNO is -1, do this for all registers, skipping any that are | |
4556 | assumed to have been saved by regsets_store_inferior_registers, | |
4557 | unless ALL is non-zero. | |
4558 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4559 | static void | |
3aee8918 PA |
4560 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4561 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4562 | { |
3aee8918 PA |
4563 | struct usrregs_info *usr = regs_info->usrregs; |
4564 | ||
1faeff08 MR |
4565 | if (regno == -1) |
4566 | { | |
3aee8918 PA |
4567 | for (regno = 0; regno < usr->num_regs; regno++) |
4568 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4569 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4570 | } |
4571 | else | |
3aee8918 | 4572 | store_register (usr, regcache, regno); |
1faeff08 MR |
4573 | } |
4574 | ||
4575 | #else /* !HAVE_LINUX_USRREGS */ | |
4576 | ||
3aee8918 PA |
4577 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4578 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4579 | |
58caa3dc | 4580 | #endif |
1faeff08 MR |
4581 | |
4582 | ||
4583 | void | |
4584 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4585 | { | |
4586 | int use_regsets; | |
4587 | int all = 0; | |
3aee8918 | 4588 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4589 | |
4590 | if (regno == -1) | |
4591 | { | |
3aee8918 PA |
4592 | if (the_low_target.fetch_register != NULL |
4593 | && regs_info->usrregs != NULL) | |
4594 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4595 | (*the_low_target.fetch_register) (regcache, regno); |
4596 | ||
3aee8918 PA |
4597 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4598 | if (regs_info->usrregs != NULL) | |
4599 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4600 | } |
4601 | else | |
4602 | { | |
c14dfd32 PA |
4603 | if (the_low_target.fetch_register != NULL |
4604 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4605 | return; | |
4606 | ||
3aee8918 | 4607 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4608 | if (use_regsets) |
3aee8918 PA |
4609 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4610 | regcache); | |
4611 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4612 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4613 | } |
58caa3dc DJ |
4614 | } |
4615 | ||
4616 | void | |
442ea881 | 4617 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4618 | { |
1faeff08 MR |
4619 | int use_regsets; |
4620 | int all = 0; | |
3aee8918 | 4621 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4622 | |
4623 | if (regno == -1) | |
4624 | { | |
3aee8918 PA |
4625 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4626 | regcache); | |
4627 | if (regs_info->usrregs != NULL) | |
4628 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4629 | } |
4630 | else | |
4631 | { | |
3aee8918 | 4632 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4633 | if (use_regsets) |
3aee8918 PA |
4634 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4635 | regcache); | |
4636 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4637 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4638 | } |
58caa3dc DJ |
4639 | } |
4640 | ||
da6d8c04 | 4641 | |
da6d8c04 DJ |
4642 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4643 | to debugger memory starting at MYADDR. */ | |
4644 | ||
c3e735a6 | 4645 | static int |
f450004a | 4646 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4647 | { |
0bfdf32f | 4648 | int pid = lwpid_of (current_thread); |
4934b29e MR |
4649 | register PTRACE_XFER_TYPE *buffer; |
4650 | register CORE_ADDR addr; | |
4651 | register int count; | |
4652 | char filename[64]; | |
da6d8c04 | 4653 | register int i; |
4934b29e | 4654 | int ret; |
fd462a61 | 4655 | int fd; |
fd462a61 DJ |
4656 | |
4657 | /* Try using /proc. Don't bother for one word. */ | |
4658 | if (len >= 3 * sizeof (long)) | |
4659 | { | |
4934b29e MR |
4660 | int bytes; |
4661 | ||
fd462a61 DJ |
4662 | /* We could keep this file open and cache it - possibly one per |
4663 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4664 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4665 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4666 | if (fd == -1) | |
4667 | goto no_proc; | |
4668 | ||
4669 | /* If pread64 is available, use it. It's faster if the kernel | |
4670 | supports it (only one syscall), and it's 64-bit safe even on | |
4671 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4672 | application). */ | |
4673 | #ifdef HAVE_PREAD64 | |
4934b29e | 4674 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4675 | #else |
4934b29e MR |
4676 | bytes = -1; |
4677 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4678 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4679 | #endif |
fd462a61 DJ |
4680 | |
4681 | close (fd); | |
4934b29e MR |
4682 | if (bytes == len) |
4683 | return 0; | |
4684 | ||
4685 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4686 | if (bytes > 0) | |
4687 | { | |
4688 | memaddr += bytes; | |
4689 | myaddr += bytes; | |
4690 | len -= bytes; | |
4691 | } | |
fd462a61 | 4692 | } |
da6d8c04 | 4693 | |
fd462a61 | 4694 | no_proc: |
4934b29e MR |
4695 | /* Round starting address down to longword boundary. */ |
4696 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4697 | /* Round ending address up; get number of longwords that makes. */ | |
4698 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4699 | / sizeof (PTRACE_XFER_TYPE)); | |
4700 | /* Allocate buffer of that many longwords. */ | |
4701 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4702 | ||
da6d8c04 | 4703 | /* Read all the longwords */ |
4934b29e | 4704 | errno = 0; |
da6d8c04 DJ |
4705 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4706 | { | |
14ce3065 DE |
4707 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4708 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4709 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4710 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4711 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4712 | if (errno) |
4934b29e | 4713 | break; |
da6d8c04 | 4714 | } |
4934b29e | 4715 | ret = errno; |
da6d8c04 DJ |
4716 | |
4717 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4718 | if (i > 0) |
4719 | { | |
4720 | i *= sizeof (PTRACE_XFER_TYPE); | |
4721 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4722 | memcpy (myaddr, | |
4723 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4724 | i < len ? i : len); | |
4725 | } | |
c3e735a6 | 4726 | |
4934b29e | 4727 | return ret; |
da6d8c04 DJ |
4728 | } |
4729 | ||
93ae6fdc PA |
4730 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4731 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4732 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4733 | |
ce3a066d | 4734 | static int |
f450004a | 4735 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4736 | { |
4737 | register int i; | |
4738 | /* Round starting address down to longword boundary. */ | |
4739 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4740 | /* Round ending address up; get number of longwords that makes. */ | |
4741 | register int count | |
493e2a69 MS |
4742 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4743 | / sizeof (PTRACE_XFER_TYPE); | |
4744 | ||
da6d8c04 | 4745 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4746 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4747 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4748 | ||
0bfdf32f | 4749 | int pid = lwpid_of (current_thread); |
da6d8c04 | 4750 | |
f0ae6fc3 PA |
4751 | if (len == 0) |
4752 | { | |
4753 | /* Zero length write always succeeds. */ | |
4754 | return 0; | |
4755 | } | |
4756 | ||
0d62e5e8 DJ |
4757 | if (debug_threads) |
4758 | { | |
58d6951d DJ |
4759 | /* Dump up to four bytes. */ |
4760 | unsigned int val = * (unsigned int *) myaddr; | |
4761 | if (len == 1) | |
4762 | val = val & 0xff; | |
4763 | else if (len == 2) | |
4764 | val = val & 0xffff; | |
4765 | else if (len == 3) | |
4766 | val = val & 0xffffff; | |
87ce2a04 DE |
4767 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4768 | val, (long)memaddr); | |
0d62e5e8 DJ |
4769 | } |
4770 | ||
da6d8c04 DJ |
4771 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4772 | ||
93ae6fdc | 4773 | errno = 0; |
14ce3065 DE |
4774 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4775 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4776 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4777 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4778 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4779 | if (errno) |
4780 | return errno; | |
da6d8c04 DJ |
4781 | |
4782 | if (count > 1) | |
4783 | { | |
93ae6fdc | 4784 | errno = 0; |
da6d8c04 | 4785 | buffer[count - 1] |
95954743 | 4786 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4787 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4788 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4789 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4790 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4791 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4792 | if (errno) |
4793 | return errno; | |
da6d8c04 DJ |
4794 | } |
4795 | ||
93ae6fdc | 4796 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4797 | |
493e2a69 MS |
4798 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4799 | myaddr, len); | |
da6d8c04 DJ |
4800 | |
4801 | /* Write the entire buffer. */ | |
4802 | ||
4803 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4804 | { | |
4805 | errno = 0; | |
14ce3065 DE |
4806 | ptrace (PTRACE_POKETEXT, pid, |
4807 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4808 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4809 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4810 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4811 | if (errno) |
4812 | return errno; | |
4813 | } | |
4814 | ||
4815 | return 0; | |
4816 | } | |
2f2893d9 DJ |
4817 | |
4818 | static void | |
4819 | linux_look_up_symbols (void) | |
4820 | { | |
0d62e5e8 | 4821 | #ifdef USE_THREAD_DB |
95954743 PA |
4822 | struct process_info *proc = current_process (); |
4823 | ||
cdbfd419 | 4824 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4825 | return; |
4826 | ||
96d7229d LM |
4827 | /* If the kernel supports tracing clones, then we don't need to |
4828 | use the magic thread event breakpoint to learn about | |
4829 | threads. */ | |
4830 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4831 | #endif |
4832 | } | |
4833 | ||
e5379b03 | 4834 | static void |
ef57601b | 4835 | linux_request_interrupt (void) |
e5379b03 | 4836 | { |
a1928bad | 4837 | extern unsigned long signal_pid; |
e5379b03 | 4838 | |
78708b7c PA |
4839 | /* Send a SIGINT to the process group. This acts just like the user |
4840 | typed a ^C on the controlling terminal. */ | |
4841 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
4842 | } |
4843 | ||
aa691b87 RM |
4844 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4845 | to debugger memory starting at MYADDR. */ | |
4846 | ||
4847 | static int | |
f450004a | 4848 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4849 | { |
4850 | char filename[PATH_MAX]; | |
4851 | int fd, n; | |
0bfdf32f | 4852 | int pid = lwpid_of (current_thread); |
aa691b87 | 4853 | |
6cebaf6e | 4854 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4855 | |
4856 | fd = open (filename, O_RDONLY); | |
4857 | if (fd < 0) | |
4858 | return -1; | |
4859 | ||
4860 | if (offset != (CORE_ADDR) 0 | |
4861 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4862 | n = -1; | |
4863 | else | |
4864 | n = read (fd, myaddr, len); | |
4865 | ||
4866 | close (fd); | |
4867 | ||
4868 | return n; | |
4869 | } | |
4870 | ||
d993e290 PA |
4871 | /* These breakpoint and watchpoint related wrapper functions simply |
4872 | pass on the function call if the target has registered a | |
4873 | corresponding function. */ | |
e013ee27 OF |
4874 | |
4875 | static int | |
802e8e6d PA |
4876 | linux_supports_z_point_type (char z_type) |
4877 | { | |
4878 | return (the_low_target.supports_z_point_type != NULL | |
4879 | && the_low_target.supports_z_point_type (z_type)); | |
4880 | } | |
4881 | ||
4882 | static int | |
4883 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4884 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4885 | { |
d993e290 | 4886 | if (the_low_target.insert_point != NULL) |
802e8e6d | 4887 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
4888 | else |
4889 | /* Unsupported (see target.h). */ | |
4890 | return 1; | |
4891 | } | |
4892 | ||
4893 | static int | |
802e8e6d PA |
4894 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
4895 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4896 | { |
d993e290 | 4897 | if (the_low_target.remove_point != NULL) |
802e8e6d | 4898 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
4899 | else |
4900 | /* Unsupported (see target.h). */ | |
4901 | return 1; | |
4902 | } | |
4903 | ||
4904 | static int | |
4905 | linux_stopped_by_watchpoint (void) | |
4906 | { | |
0bfdf32f | 4907 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 4908 | |
582511be | 4909 | return lwp->stop_reason == LWP_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
4910 | } |
4911 | ||
4912 | static CORE_ADDR | |
4913 | linux_stopped_data_address (void) | |
4914 | { | |
0bfdf32f | 4915 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
4916 | |
4917 | return lwp->stopped_data_address; | |
e013ee27 OF |
4918 | } |
4919 | ||
db0dfaa0 LM |
4920 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4921 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4922 | && defined(PT_TEXT_END_ADDR) | |
4923 | ||
4924 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4925 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4926 | the target has different ways of acquiring this information, like | |
4927 | loadmaps. */ | |
52fb6437 NS |
4928 | |
4929 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4930 | to tell gdb about. */ | |
4931 | ||
4932 | static int | |
4933 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4934 | { | |
52fb6437 | 4935 | unsigned long text, text_end, data; |
0bfdf32f | 4936 | int pid = lwpid_of (get_thread_lwp (current_thread)); |
52fb6437 NS |
4937 | |
4938 | errno = 0; | |
4939 | ||
b8e1b30e LM |
4940 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4941 | (PTRACE_TYPE_ARG4) 0); | |
4942 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4943 | (PTRACE_TYPE_ARG4) 0); | |
4944 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4945 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4946 | |
4947 | if (errno == 0) | |
4948 | { | |
4949 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4950 | used by gdb) are relative to the beginning of the program, |
4951 | with the data segment immediately following the text segment. | |
4952 | However, the actual runtime layout in memory may put the data | |
4953 | somewhere else, so when we send gdb a data base-address, we | |
4954 | use the real data base address and subtract the compile-time | |
4955 | data base-address from it (which is just the length of the | |
4956 | text segment). BSS immediately follows data in both | |
4957 | cases. */ | |
52fb6437 NS |
4958 | *text_p = text; |
4959 | *data_p = data - (text_end - text); | |
1b3f6016 | 4960 | |
52fb6437 NS |
4961 | return 1; |
4962 | } | |
52fb6437 NS |
4963 | return 0; |
4964 | } | |
4965 | #endif | |
4966 | ||
07e059b5 VP |
4967 | static int |
4968 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4969 | unsigned char *readbuf, unsigned const char *writebuf, |
4970 | CORE_ADDR offset, int len) | |
07e059b5 | 4971 | { |
d26e3629 | 4972 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4973 | } |
4974 | ||
d0722149 DE |
4975 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4976 | layout of the inferiors' architecture. */ | |
4977 | ||
4978 | static void | |
a5362b9a | 4979 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4980 | { |
4981 | int done = 0; | |
4982 | ||
4983 | if (the_low_target.siginfo_fixup != NULL) | |
4984 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4985 | ||
4986 | /* If there was no callback, or the callback didn't do anything, | |
4987 | then just do a straight memcpy. */ | |
4988 | if (!done) | |
4989 | { | |
4990 | if (direction == 1) | |
a5362b9a | 4991 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4992 | else |
a5362b9a | 4993 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4994 | } |
4995 | } | |
4996 | ||
4aa995e1 PA |
4997 | static int |
4998 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4999 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5000 | { | |
d0722149 | 5001 | int pid; |
a5362b9a TS |
5002 | siginfo_t siginfo; |
5003 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5004 | |
0bfdf32f | 5005 | if (current_thread == NULL) |
4aa995e1 PA |
5006 | return -1; |
5007 | ||
0bfdf32f | 5008 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5009 | |
5010 | if (debug_threads) | |
87ce2a04 DE |
5011 | debug_printf ("%s siginfo for lwp %d.\n", |
5012 | readbuf != NULL ? "Reading" : "Writing", | |
5013 | pid); | |
4aa995e1 | 5014 | |
0adea5f7 | 5015 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5016 | return -1; |
5017 | ||
b8e1b30e | 5018 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5019 | return -1; |
5020 | ||
d0722149 DE |
5021 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5022 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5023 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5024 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5025 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5026 | ||
4aa995e1 PA |
5027 | if (offset + len > sizeof (siginfo)) |
5028 | len = sizeof (siginfo) - offset; | |
5029 | ||
5030 | if (readbuf != NULL) | |
d0722149 | 5031 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5032 | else |
5033 | { | |
d0722149 DE |
5034 | memcpy (inf_siginfo + offset, writebuf, len); |
5035 | ||
5036 | /* Convert back to ptrace layout before flushing it out. */ | |
5037 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5038 | ||
b8e1b30e | 5039 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5040 | return -1; |
5041 | } | |
5042 | ||
5043 | return len; | |
5044 | } | |
5045 | ||
bd99dc85 PA |
5046 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5047 | so we notice when children change state; as the handler for the | |
5048 | sigsuspend in my_waitpid. */ | |
5049 | ||
5050 | static void | |
5051 | sigchld_handler (int signo) | |
5052 | { | |
5053 | int old_errno = errno; | |
5054 | ||
5055 | if (debug_threads) | |
e581f2b4 PA |
5056 | { |
5057 | do | |
5058 | { | |
5059 | /* fprintf is not async-signal-safe, so call write | |
5060 | directly. */ | |
5061 | if (write (2, "sigchld_handler\n", | |
5062 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5063 | break; /* just ignore */ | |
5064 | } while (0); | |
5065 | } | |
bd99dc85 PA |
5066 | |
5067 | if (target_is_async_p ()) | |
5068 | async_file_mark (); /* trigger a linux_wait */ | |
5069 | ||
5070 | errno = old_errno; | |
5071 | } | |
5072 | ||
5073 | static int | |
5074 | linux_supports_non_stop (void) | |
5075 | { | |
5076 | return 1; | |
5077 | } | |
5078 | ||
5079 | static int | |
5080 | linux_async (int enable) | |
5081 | { | |
7089dca4 | 5082 | int previous = target_is_async_p (); |
bd99dc85 | 5083 | |
8336d594 | 5084 | if (debug_threads) |
87ce2a04 DE |
5085 | debug_printf ("linux_async (%d), previous=%d\n", |
5086 | enable, previous); | |
8336d594 | 5087 | |
bd99dc85 PA |
5088 | if (previous != enable) |
5089 | { | |
5090 | sigset_t mask; | |
5091 | sigemptyset (&mask); | |
5092 | sigaddset (&mask, SIGCHLD); | |
5093 | ||
5094 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5095 | ||
5096 | if (enable) | |
5097 | { | |
5098 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5099 | { |
5100 | linux_event_pipe[0] = -1; | |
5101 | linux_event_pipe[1] = -1; | |
5102 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5103 | ||
5104 | warning ("creating event pipe failed."); | |
5105 | return previous; | |
5106 | } | |
bd99dc85 PA |
5107 | |
5108 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5109 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5110 | ||
5111 | /* Register the event loop handler. */ | |
5112 | add_file_handler (linux_event_pipe[0], | |
5113 | handle_target_event, NULL); | |
5114 | ||
5115 | /* Always trigger a linux_wait. */ | |
5116 | async_file_mark (); | |
5117 | } | |
5118 | else | |
5119 | { | |
5120 | delete_file_handler (linux_event_pipe[0]); | |
5121 | ||
5122 | close (linux_event_pipe[0]); | |
5123 | close (linux_event_pipe[1]); | |
5124 | linux_event_pipe[0] = -1; | |
5125 | linux_event_pipe[1] = -1; | |
5126 | } | |
5127 | ||
5128 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5129 | } | |
5130 | ||
5131 | return previous; | |
5132 | } | |
5133 | ||
5134 | static int | |
5135 | linux_start_non_stop (int nonstop) | |
5136 | { | |
5137 | /* Register or unregister from event-loop accordingly. */ | |
5138 | linux_async (nonstop); | |
aa96c426 GB |
5139 | |
5140 | if (target_is_async_p () != (nonstop != 0)) | |
5141 | return -1; | |
5142 | ||
bd99dc85 PA |
5143 | return 0; |
5144 | } | |
5145 | ||
cf8fd78b PA |
5146 | static int |
5147 | linux_supports_multi_process (void) | |
5148 | { | |
5149 | return 1; | |
5150 | } | |
5151 | ||
03583c20 UW |
5152 | static int |
5153 | linux_supports_disable_randomization (void) | |
5154 | { | |
5155 | #ifdef HAVE_PERSONALITY | |
5156 | return 1; | |
5157 | #else | |
5158 | return 0; | |
5159 | #endif | |
5160 | } | |
efcbbd14 | 5161 | |
d1feda86 YQ |
5162 | static int |
5163 | linux_supports_agent (void) | |
5164 | { | |
5165 | return 1; | |
5166 | } | |
5167 | ||
c2d6af84 PA |
5168 | static int |
5169 | linux_supports_range_stepping (void) | |
5170 | { | |
5171 | if (*the_low_target.supports_range_stepping == NULL) | |
5172 | return 0; | |
5173 | ||
5174 | return (*the_low_target.supports_range_stepping) (); | |
5175 | } | |
5176 | ||
efcbbd14 UW |
5177 | /* Enumerate spufs IDs for process PID. */ |
5178 | static int | |
5179 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5180 | { | |
5181 | int pos = 0; | |
5182 | int written = 0; | |
5183 | char path[128]; | |
5184 | DIR *dir; | |
5185 | struct dirent *entry; | |
5186 | ||
5187 | sprintf (path, "/proc/%ld/fd", pid); | |
5188 | dir = opendir (path); | |
5189 | if (!dir) | |
5190 | return -1; | |
5191 | ||
5192 | rewinddir (dir); | |
5193 | while ((entry = readdir (dir)) != NULL) | |
5194 | { | |
5195 | struct stat st; | |
5196 | struct statfs stfs; | |
5197 | int fd; | |
5198 | ||
5199 | fd = atoi (entry->d_name); | |
5200 | if (!fd) | |
5201 | continue; | |
5202 | ||
5203 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5204 | if (stat (path, &st) != 0) | |
5205 | continue; | |
5206 | if (!S_ISDIR (st.st_mode)) | |
5207 | continue; | |
5208 | ||
5209 | if (statfs (path, &stfs) != 0) | |
5210 | continue; | |
5211 | if (stfs.f_type != SPUFS_MAGIC) | |
5212 | continue; | |
5213 | ||
5214 | if (pos >= offset && pos + 4 <= offset + len) | |
5215 | { | |
5216 | *(unsigned int *)(buf + pos - offset) = fd; | |
5217 | written += 4; | |
5218 | } | |
5219 | pos += 4; | |
5220 | } | |
5221 | ||
5222 | closedir (dir); | |
5223 | return written; | |
5224 | } | |
5225 | ||
5226 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5227 | object type, using the /proc file system. */ | |
5228 | static int | |
5229 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5230 | unsigned const char *writebuf, | |
5231 | CORE_ADDR offset, int len) | |
5232 | { | |
0bfdf32f | 5233 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5234 | char buf[128]; |
5235 | int fd = 0; | |
5236 | int ret = 0; | |
5237 | ||
5238 | if (!writebuf && !readbuf) | |
5239 | return -1; | |
5240 | ||
5241 | if (!*annex) | |
5242 | { | |
5243 | if (!readbuf) | |
5244 | return -1; | |
5245 | else | |
5246 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5247 | } | |
5248 | ||
5249 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5250 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5251 | if (fd <= 0) | |
5252 | return -1; | |
5253 | ||
5254 | if (offset != 0 | |
5255 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5256 | { | |
5257 | close (fd); | |
5258 | return 0; | |
5259 | } | |
5260 | ||
5261 | if (writebuf) | |
5262 | ret = write (fd, writebuf, (size_t) len); | |
5263 | else | |
5264 | ret = read (fd, readbuf, (size_t) len); | |
5265 | ||
5266 | close (fd); | |
5267 | return ret; | |
5268 | } | |
5269 | ||
723b724b | 5270 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5271 | struct target_loadseg |
5272 | { | |
5273 | /* Core address to which the segment is mapped. */ | |
5274 | Elf32_Addr addr; | |
5275 | /* VMA recorded in the program header. */ | |
5276 | Elf32_Addr p_vaddr; | |
5277 | /* Size of this segment in memory. */ | |
5278 | Elf32_Word p_memsz; | |
5279 | }; | |
5280 | ||
723b724b | 5281 | # if defined PT_GETDSBT |
78d85199 YQ |
5282 | struct target_loadmap |
5283 | { | |
5284 | /* Protocol version number, must be zero. */ | |
5285 | Elf32_Word version; | |
5286 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5287 | unsigned *dsbt_table; | |
5288 | unsigned dsbt_size, dsbt_index; | |
5289 | /* Number of segments in this map. */ | |
5290 | Elf32_Word nsegs; | |
5291 | /* The actual memory map. */ | |
5292 | struct target_loadseg segs[/*nsegs*/]; | |
5293 | }; | |
723b724b MF |
5294 | # define LINUX_LOADMAP PT_GETDSBT |
5295 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5296 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5297 | # else | |
5298 | struct target_loadmap | |
5299 | { | |
5300 | /* Protocol version number, must be zero. */ | |
5301 | Elf32_Half version; | |
5302 | /* Number of segments in this map. */ | |
5303 | Elf32_Half nsegs; | |
5304 | /* The actual memory map. */ | |
5305 | struct target_loadseg segs[/*nsegs*/]; | |
5306 | }; | |
5307 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5308 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5309 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5310 | # endif | |
78d85199 | 5311 | |
78d85199 YQ |
5312 | static int |
5313 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5314 | unsigned char *myaddr, unsigned int len) | |
5315 | { | |
0bfdf32f | 5316 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5317 | int addr = -1; |
5318 | struct target_loadmap *data = NULL; | |
5319 | unsigned int actual_length, copy_length; | |
5320 | ||
5321 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5322 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5323 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5324 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5325 | else |
5326 | return -1; | |
5327 | ||
723b724b | 5328 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5329 | return -1; |
5330 | ||
5331 | if (data == NULL) | |
5332 | return -1; | |
5333 | ||
5334 | actual_length = sizeof (struct target_loadmap) | |
5335 | + sizeof (struct target_loadseg) * data->nsegs; | |
5336 | ||
5337 | if (offset < 0 || offset > actual_length) | |
5338 | return -1; | |
5339 | ||
5340 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5341 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5342 | return copy_length; | |
5343 | } | |
723b724b MF |
5344 | #else |
5345 | # define linux_read_loadmap NULL | |
5346 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5347 | |
1570b33e L |
5348 | static void |
5349 | linux_process_qsupported (const char *query) | |
5350 | { | |
5351 | if (the_low_target.process_qsupported != NULL) | |
5352 | the_low_target.process_qsupported (query); | |
5353 | } | |
5354 | ||
219f2f23 PA |
5355 | static int |
5356 | linux_supports_tracepoints (void) | |
5357 | { | |
5358 | if (*the_low_target.supports_tracepoints == NULL) | |
5359 | return 0; | |
5360 | ||
5361 | return (*the_low_target.supports_tracepoints) (); | |
5362 | } | |
5363 | ||
5364 | static CORE_ADDR | |
5365 | linux_read_pc (struct regcache *regcache) | |
5366 | { | |
5367 | if (the_low_target.get_pc == NULL) | |
5368 | return 0; | |
5369 | ||
5370 | return (*the_low_target.get_pc) (regcache); | |
5371 | } | |
5372 | ||
5373 | static void | |
5374 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5375 | { | |
5376 | gdb_assert (the_low_target.set_pc != NULL); | |
5377 | ||
5378 | (*the_low_target.set_pc) (regcache, pc); | |
5379 | } | |
5380 | ||
8336d594 PA |
5381 | static int |
5382 | linux_thread_stopped (struct thread_info *thread) | |
5383 | { | |
5384 | return get_thread_lwp (thread)->stopped; | |
5385 | } | |
5386 | ||
5387 | /* This exposes stop-all-threads functionality to other modules. */ | |
5388 | ||
5389 | static void | |
7984d532 | 5390 | linux_pause_all (int freeze) |
8336d594 | 5391 | { |
7984d532 PA |
5392 | stop_all_lwps (freeze, NULL); |
5393 | } | |
5394 | ||
5395 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5396 | modules. */ | |
5397 | ||
5398 | static void | |
5399 | linux_unpause_all (int unfreeze) | |
5400 | { | |
5401 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5402 | } |
5403 | ||
90d74c30 PA |
5404 | static int |
5405 | linux_prepare_to_access_memory (void) | |
5406 | { | |
5407 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5408 | running LWP. */ | |
5409 | if (non_stop) | |
5410 | linux_pause_all (1); | |
5411 | return 0; | |
5412 | } | |
5413 | ||
5414 | static void | |
0146f85b | 5415 | linux_done_accessing_memory (void) |
90d74c30 PA |
5416 | { |
5417 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5418 | running LWP. */ | |
5419 | if (non_stop) | |
5420 | linux_unpause_all (1); | |
5421 | } | |
5422 | ||
fa593d66 PA |
5423 | static int |
5424 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5425 | CORE_ADDR collector, | |
5426 | CORE_ADDR lockaddr, | |
5427 | ULONGEST orig_size, | |
5428 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5429 | CORE_ADDR *trampoline, |
5430 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5431 | unsigned char *jjump_pad_insn, |
5432 | ULONGEST *jjump_pad_insn_size, | |
5433 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5434 | CORE_ADDR *adjusted_insn_addr_end, |
5435 | char *err) | |
fa593d66 PA |
5436 | { |
5437 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5438 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5439 | jump_entry, trampoline, trampoline_size, |
5440 | jjump_pad_insn, jjump_pad_insn_size, | |
5441 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5442 | err); | |
fa593d66 PA |
5443 | } |
5444 | ||
6a271cae PA |
5445 | static struct emit_ops * |
5446 | linux_emit_ops (void) | |
5447 | { | |
5448 | if (the_low_target.emit_ops != NULL) | |
5449 | return (*the_low_target.emit_ops) (); | |
5450 | else | |
5451 | return NULL; | |
5452 | } | |
5453 | ||
405f8e94 SS |
5454 | static int |
5455 | linux_get_min_fast_tracepoint_insn_len (void) | |
5456 | { | |
5457 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5458 | } | |
5459 | ||
2268b414 JK |
5460 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5461 | ||
5462 | static int | |
5463 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5464 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5465 | { | |
5466 | char filename[PATH_MAX]; | |
5467 | int fd; | |
5468 | const int auxv_size = is_elf64 | |
5469 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5470 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5471 | ||
5472 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5473 | ||
5474 | fd = open (filename, O_RDONLY); | |
5475 | if (fd < 0) | |
5476 | return 1; | |
5477 | ||
5478 | *phdr_memaddr = 0; | |
5479 | *num_phdr = 0; | |
5480 | while (read (fd, buf, auxv_size) == auxv_size | |
5481 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5482 | { | |
5483 | if (is_elf64) | |
5484 | { | |
5485 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5486 | ||
5487 | switch (aux->a_type) | |
5488 | { | |
5489 | case AT_PHDR: | |
5490 | *phdr_memaddr = aux->a_un.a_val; | |
5491 | break; | |
5492 | case AT_PHNUM: | |
5493 | *num_phdr = aux->a_un.a_val; | |
5494 | break; | |
5495 | } | |
5496 | } | |
5497 | else | |
5498 | { | |
5499 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5500 | ||
5501 | switch (aux->a_type) | |
5502 | { | |
5503 | case AT_PHDR: | |
5504 | *phdr_memaddr = aux->a_un.a_val; | |
5505 | break; | |
5506 | case AT_PHNUM: | |
5507 | *num_phdr = aux->a_un.a_val; | |
5508 | break; | |
5509 | } | |
5510 | } | |
5511 | } | |
5512 | ||
5513 | close (fd); | |
5514 | ||
5515 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5516 | { | |
5517 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5518 | "phdr_memaddr = %ld, phdr_num = %d", | |
5519 | (long) *phdr_memaddr, *num_phdr); | |
5520 | return 2; | |
5521 | } | |
5522 | ||
5523 | return 0; | |
5524 | } | |
5525 | ||
5526 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5527 | ||
5528 | static CORE_ADDR | |
5529 | get_dynamic (const int pid, const int is_elf64) | |
5530 | { | |
5531 | CORE_ADDR phdr_memaddr, relocation; | |
5532 | int num_phdr, i; | |
5533 | unsigned char *phdr_buf; | |
5534 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5535 | ||
5536 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5537 | return 0; | |
5538 | ||
5539 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5540 | phdr_buf = alloca (num_phdr * phdr_size); | |
5541 | ||
5542 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5543 | return 0; | |
5544 | ||
5545 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5546 | non-zero for PIE ones. */ | |
5547 | relocation = -1; | |
5548 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5549 | if (is_elf64) | |
5550 | { | |
5551 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5552 | ||
5553 | if (p->p_type == PT_PHDR) | |
5554 | relocation = phdr_memaddr - p->p_vaddr; | |
5555 | } | |
5556 | else | |
5557 | { | |
5558 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5559 | ||
5560 | if (p->p_type == PT_PHDR) | |
5561 | relocation = phdr_memaddr - p->p_vaddr; | |
5562 | } | |
5563 | ||
5564 | if (relocation == -1) | |
5565 | { | |
e237a7e2 JK |
5566 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5567 | any real world executables, including PIE executables, have always | |
5568 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5569 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5570 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5571 | ||
5572 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5573 | ||
5574 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5575 | ||
2268b414 JK |
5576 | return 0; |
5577 | } | |
5578 | ||
5579 | for (i = 0; i < num_phdr; i++) | |
5580 | { | |
5581 | if (is_elf64) | |
5582 | { | |
5583 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5584 | ||
5585 | if (p->p_type == PT_DYNAMIC) | |
5586 | return p->p_vaddr + relocation; | |
5587 | } | |
5588 | else | |
5589 | { | |
5590 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5591 | ||
5592 | if (p->p_type == PT_DYNAMIC) | |
5593 | return p->p_vaddr + relocation; | |
5594 | } | |
5595 | } | |
5596 | ||
5597 | return 0; | |
5598 | } | |
5599 | ||
5600 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5601 | can be 0 if the inferior does not yet have the library list initialized. |
5602 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5603 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5604 | |
5605 | static CORE_ADDR | |
5606 | get_r_debug (const int pid, const int is_elf64) | |
5607 | { | |
5608 | CORE_ADDR dynamic_memaddr; | |
5609 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5610 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5611 | CORE_ADDR map = -1; |
2268b414 JK |
5612 | |
5613 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5614 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5615 | return map; |
2268b414 JK |
5616 | |
5617 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5618 | { | |
5619 | if (is_elf64) | |
5620 | { | |
5621 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5622 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5623 | union |
5624 | { | |
5625 | Elf64_Xword map; | |
5626 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5627 | } | |
5628 | rld_map; | |
5629 | ||
5630 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5631 | { | |
5632 | if (linux_read_memory (dyn->d_un.d_val, | |
5633 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5634 | return rld_map.map; | |
5635 | else | |
5636 | break; | |
5637 | } | |
75f62ce7 | 5638 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5639 | |
367ba2c2 MR |
5640 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5641 | map = dyn->d_un.d_val; | |
2268b414 JK |
5642 | |
5643 | if (dyn->d_tag == DT_NULL) | |
5644 | break; | |
5645 | } | |
5646 | else | |
5647 | { | |
5648 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5649 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5650 | union |
5651 | { | |
5652 | Elf32_Word map; | |
5653 | unsigned char buf[sizeof (Elf32_Word)]; | |
5654 | } | |
5655 | rld_map; | |
5656 | ||
5657 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5658 | { | |
5659 | if (linux_read_memory (dyn->d_un.d_val, | |
5660 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5661 | return rld_map.map; | |
5662 | else | |
5663 | break; | |
5664 | } | |
75f62ce7 | 5665 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5666 | |
367ba2c2 MR |
5667 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5668 | map = dyn->d_un.d_val; | |
2268b414 JK |
5669 | |
5670 | if (dyn->d_tag == DT_NULL) | |
5671 | break; | |
5672 | } | |
5673 | ||
5674 | dynamic_memaddr += dyn_size; | |
5675 | } | |
5676 | ||
367ba2c2 | 5677 | return map; |
2268b414 JK |
5678 | } |
5679 | ||
5680 | /* Read one pointer from MEMADDR in the inferior. */ | |
5681 | ||
5682 | static int | |
5683 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5684 | { | |
485f1ee4 PA |
5685 | int ret; |
5686 | ||
5687 | /* Go through a union so this works on either big or little endian | |
5688 | hosts, when the inferior's pointer size is smaller than the size | |
5689 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5690 | same of the superior's. */ | |
5691 | union | |
5692 | { | |
5693 | CORE_ADDR core_addr; | |
5694 | unsigned int ui; | |
5695 | unsigned char uc; | |
5696 | } addr; | |
5697 | ||
5698 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5699 | if (ret == 0) | |
5700 | { | |
5701 | if (ptr_size == sizeof (CORE_ADDR)) | |
5702 | *ptr = addr.core_addr; | |
5703 | else if (ptr_size == sizeof (unsigned int)) | |
5704 | *ptr = addr.ui; | |
5705 | else | |
5706 | gdb_assert_not_reached ("unhandled pointer size"); | |
5707 | } | |
5708 | return ret; | |
2268b414 JK |
5709 | } |
5710 | ||
5711 | struct link_map_offsets | |
5712 | { | |
5713 | /* Offset and size of r_debug.r_version. */ | |
5714 | int r_version_offset; | |
5715 | ||
5716 | /* Offset and size of r_debug.r_map. */ | |
5717 | int r_map_offset; | |
5718 | ||
5719 | /* Offset to l_addr field in struct link_map. */ | |
5720 | int l_addr_offset; | |
5721 | ||
5722 | /* Offset to l_name field in struct link_map. */ | |
5723 | int l_name_offset; | |
5724 | ||
5725 | /* Offset to l_ld field in struct link_map. */ | |
5726 | int l_ld_offset; | |
5727 | ||
5728 | /* Offset to l_next field in struct link_map. */ | |
5729 | int l_next_offset; | |
5730 | ||
5731 | /* Offset to l_prev field in struct link_map. */ | |
5732 | int l_prev_offset; | |
5733 | }; | |
5734 | ||
fb723180 | 5735 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5736 | |
5737 | static int | |
5738 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5739 | unsigned const char *writebuf, | |
5740 | CORE_ADDR offset, int len) | |
5741 | { | |
5742 | char *document; | |
5743 | unsigned document_len; | |
5744 | struct process_info_private *const priv = current_process ()->private; | |
5745 | char filename[PATH_MAX]; | |
5746 | int pid, is_elf64; | |
5747 | ||
5748 | static const struct link_map_offsets lmo_32bit_offsets = | |
5749 | { | |
5750 | 0, /* r_version offset. */ | |
5751 | 4, /* r_debug.r_map offset. */ | |
5752 | 0, /* l_addr offset in link_map. */ | |
5753 | 4, /* l_name offset in link_map. */ | |
5754 | 8, /* l_ld offset in link_map. */ | |
5755 | 12, /* l_next offset in link_map. */ | |
5756 | 16 /* l_prev offset in link_map. */ | |
5757 | }; | |
5758 | ||
5759 | static const struct link_map_offsets lmo_64bit_offsets = | |
5760 | { | |
5761 | 0, /* r_version offset. */ | |
5762 | 8, /* r_debug.r_map offset. */ | |
5763 | 0, /* l_addr offset in link_map. */ | |
5764 | 8, /* l_name offset in link_map. */ | |
5765 | 16, /* l_ld offset in link_map. */ | |
5766 | 24, /* l_next offset in link_map. */ | |
5767 | 32 /* l_prev offset in link_map. */ | |
5768 | }; | |
5769 | const struct link_map_offsets *lmo; | |
214d508e | 5770 | unsigned int machine; |
b1fbec62 GB |
5771 | int ptr_size; |
5772 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5773 | int allocated = 1024; | |
5774 | char *p; | |
5775 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5776 | int header_done = 0; | |
2268b414 JK |
5777 | |
5778 | if (writebuf != NULL) | |
5779 | return -2; | |
5780 | if (readbuf == NULL) | |
5781 | return -1; | |
5782 | ||
0bfdf32f | 5783 | pid = lwpid_of (current_thread); |
2268b414 | 5784 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5785 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5786 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5787 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5788 | |
b1fbec62 GB |
5789 | while (annex[0] != '\0') |
5790 | { | |
5791 | const char *sep; | |
5792 | CORE_ADDR *addrp; | |
5793 | int len; | |
2268b414 | 5794 | |
b1fbec62 GB |
5795 | sep = strchr (annex, '='); |
5796 | if (sep == NULL) | |
5797 | break; | |
0c5bf5a9 | 5798 | |
b1fbec62 GB |
5799 | len = sep - annex; |
5800 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5801 | addrp = &lm_addr; | |
5802 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5803 | addrp = &lm_prev; | |
5804 | else | |
5805 | { | |
5806 | annex = strchr (sep, ';'); | |
5807 | if (annex == NULL) | |
5808 | break; | |
5809 | annex++; | |
5810 | continue; | |
5811 | } | |
5812 | ||
5813 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5814 | } |
b1fbec62 GB |
5815 | |
5816 | if (lm_addr == 0) | |
2268b414 | 5817 | { |
b1fbec62 GB |
5818 | int r_version = 0; |
5819 | ||
5820 | if (priv->r_debug == 0) | |
5821 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5822 | ||
5823 | /* We failed to find DT_DEBUG. Such situation will not change | |
5824 | for this inferior - do not retry it. Report it to GDB as | |
5825 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5826 | if (priv->r_debug == (CORE_ADDR) -1) | |
5827 | return -1; | |
5828 | ||
5829 | if (priv->r_debug != 0) | |
2268b414 | 5830 | { |
b1fbec62 GB |
5831 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5832 | (unsigned char *) &r_version, | |
5833 | sizeof (r_version)) != 0 | |
5834 | || r_version != 1) | |
5835 | { | |
5836 | warning ("unexpected r_debug version %d", r_version); | |
5837 | } | |
5838 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5839 | &lm_addr, ptr_size) != 0) | |
5840 | { | |
5841 | warning ("unable to read r_map from 0x%lx", | |
5842 | (long) priv->r_debug + lmo->r_map_offset); | |
5843 | } | |
2268b414 | 5844 | } |
b1fbec62 | 5845 | } |
2268b414 | 5846 | |
b1fbec62 GB |
5847 | document = xmalloc (allocated); |
5848 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5849 | p = document + strlen (document); | |
5850 | ||
5851 | while (lm_addr | |
5852 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5853 | &l_name, ptr_size) == 0 | |
5854 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5855 | &l_addr, ptr_size) == 0 | |
5856 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5857 | &l_ld, ptr_size) == 0 | |
5858 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5859 | &l_prev, ptr_size) == 0 | |
5860 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5861 | &l_next, ptr_size) == 0) | |
5862 | { | |
5863 | unsigned char libname[PATH_MAX]; | |
5864 | ||
5865 | if (lm_prev != l_prev) | |
2268b414 | 5866 | { |
b1fbec62 GB |
5867 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5868 | (long) lm_prev, (long) l_prev); | |
5869 | break; | |
2268b414 JK |
5870 | } |
5871 | ||
d878444c JK |
5872 | /* Ignore the first entry even if it has valid name as the first entry |
5873 | corresponds to the main executable. The first entry should not be | |
5874 | skipped if the dynamic loader was loaded late by a static executable | |
5875 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5876 | executable does not have PT_DYNAMIC present and this function already | |
5877 | exited above due to failed get_r_debug. */ | |
5878 | if (lm_prev == 0) | |
2268b414 | 5879 | { |
d878444c JK |
5880 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5881 | p = p + strlen (p); | |
5882 | } | |
5883 | else | |
5884 | { | |
5885 | /* Not checking for error because reading may stop before | |
5886 | we've got PATH_MAX worth of characters. */ | |
5887 | libname[0] = '\0'; | |
5888 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5889 | libname[sizeof (libname) - 1] = '\0'; | |
5890 | if (libname[0] != '\0') | |
2268b414 | 5891 | { |
d878444c JK |
5892 | /* 6x the size for xml_escape_text below. */ |
5893 | size_t len = 6 * strlen ((char *) libname); | |
5894 | char *name; | |
2268b414 | 5895 | |
d878444c JK |
5896 | if (!header_done) |
5897 | { | |
5898 | /* Terminate `<library-list-svr4'. */ | |
5899 | *p++ = '>'; | |
5900 | header_done = 1; | |
5901 | } | |
2268b414 | 5902 | |
d878444c JK |
5903 | while (allocated < p - document + len + 200) |
5904 | { | |
5905 | /* Expand to guarantee sufficient storage. */ | |
5906 | uintptr_t document_len = p - document; | |
2268b414 | 5907 | |
d878444c JK |
5908 | document = xrealloc (document, 2 * allocated); |
5909 | allocated *= 2; | |
5910 | p = document + document_len; | |
5911 | } | |
5912 | ||
5913 | name = xml_escape_text ((char *) libname); | |
5914 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5915 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5916 | name, (unsigned long) lm_addr, | |
5917 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5918 | free (name); | |
5919 | } | |
0afae3cf | 5920 | } |
b1fbec62 GB |
5921 | |
5922 | lm_prev = lm_addr; | |
5923 | lm_addr = l_next; | |
2268b414 JK |
5924 | } |
5925 | ||
b1fbec62 GB |
5926 | if (!header_done) |
5927 | { | |
5928 | /* Empty list; terminate `<library-list-svr4'. */ | |
5929 | strcpy (p, "/>"); | |
5930 | } | |
5931 | else | |
5932 | strcpy (p, "</library-list-svr4>"); | |
5933 | ||
2268b414 JK |
5934 | document_len = strlen (document); |
5935 | if (offset < document_len) | |
5936 | document_len -= offset; | |
5937 | else | |
5938 | document_len = 0; | |
5939 | if (len > document_len) | |
5940 | len = document_len; | |
5941 | ||
5942 | memcpy (readbuf, document + offset, len); | |
5943 | xfree (document); | |
5944 | ||
5945 | return len; | |
5946 | } | |
5947 | ||
9accd112 MM |
5948 | #ifdef HAVE_LINUX_BTRACE |
5949 | ||
969c39fb | 5950 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5951 | |
5952 | static struct btrace_target_info * | |
f4abbc16 | 5953 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
5954 | { |
5955 | struct btrace_target_info *tinfo; | |
5956 | ||
f4abbc16 | 5957 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 5958 | |
9accd112 | 5959 | if (tinfo != NULL) |
3aee8918 PA |
5960 | { |
5961 | struct thread_info *thread = find_thread_ptid (ptid); | |
5962 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5963 | ||
5964 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5965 | } | |
9accd112 MM |
5966 | |
5967 | return tinfo; | |
5968 | } | |
5969 | ||
969c39fb | 5970 | /* See to_disable_btrace target method. */ |
9accd112 | 5971 | |
969c39fb MM |
5972 | static int |
5973 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5974 | { | |
5975 | enum btrace_error err; | |
5976 | ||
5977 | err = linux_disable_btrace (tinfo); | |
5978 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5979 | } | |
5980 | ||
5981 | /* See to_read_btrace target method. */ | |
5982 | ||
5983 | static int | |
9accd112 MM |
5984 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5985 | int type) | |
5986 | { | |
734b0e4b | 5987 | struct btrace_data btrace; |
9accd112 | 5988 | struct btrace_block *block; |
969c39fb | 5989 | enum btrace_error err; |
9accd112 MM |
5990 | int i; |
5991 | ||
734b0e4b MM |
5992 | btrace_data_init (&btrace); |
5993 | ||
969c39fb MM |
5994 | err = linux_read_btrace (&btrace, tinfo, type); |
5995 | if (err != BTRACE_ERR_NONE) | |
5996 | { | |
5997 | if (err == BTRACE_ERR_OVERFLOW) | |
5998 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5999 | else | |
6000 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6001 | ||
734b0e4b | 6002 | btrace_data_fini (&btrace); |
969c39fb MM |
6003 | return -1; |
6004 | } | |
9accd112 | 6005 | |
734b0e4b MM |
6006 | switch (btrace.format) |
6007 | { | |
6008 | case BTRACE_FORMAT_NONE: | |
6009 | buffer_grow_str0 (buffer, "E.No Trace."); | |
6010 | break; | |
6011 | ||
6012 | case BTRACE_FORMAT_BTS: | |
6013 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6014 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6015 | |
734b0e4b MM |
6016 | for (i = 0; |
6017 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6018 | i++) | |
6019 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6020 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6021 | |
734b0e4b MM |
6022 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6023 | break; | |
6024 | ||
6025 | default: | |
6026 | buffer_grow_str0 (buffer, "E.Unknown Trace Format."); | |
9accd112 | 6027 | |
734b0e4b MM |
6028 | btrace_data_fini (&btrace); |
6029 | return -1; | |
6030 | } | |
969c39fb | 6031 | |
734b0e4b | 6032 | btrace_data_fini (&btrace); |
969c39fb | 6033 | return 0; |
9accd112 | 6034 | } |
f4abbc16 MM |
6035 | |
6036 | /* See to_btrace_conf target method. */ | |
6037 | ||
6038 | static int | |
6039 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6040 | struct buffer *buffer) | |
6041 | { | |
6042 | const struct btrace_config *conf; | |
6043 | ||
6044 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6045 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6046 | ||
6047 | conf = linux_btrace_conf (tinfo); | |
6048 | if (conf != NULL) | |
6049 | { | |
6050 | switch (conf->format) | |
6051 | { | |
6052 | case BTRACE_FORMAT_NONE: | |
6053 | break; | |
6054 | ||
6055 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6056 | buffer_xml_printf (buffer, "<bts"); |
6057 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6058 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 MM |
6059 | break; |
6060 | } | |
6061 | } | |
6062 | ||
6063 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6064 | return 0; | |
6065 | } | |
9accd112 MM |
6066 | #endif /* HAVE_LINUX_BTRACE */ |
6067 | ||
ce3a066d DJ |
6068 | static struct target_ops linux_target_ops = { |
6069 | linux_create_inferior, | |
6070 | linux_attach, | |
6071 | linux_kill, | |
6ad8ae5c | 6072 | linux_detach, |
8336d594 | 6073 | linux_mourn, |
444d6139 | 6074 | linux_join, |
ce3a066d DJ |
6075 | linux_thread_alive, |
6076 | linux_resume, | |
6077 | linux_wait, | |
6078 | linux_fetch_registers, | |
6079 | linux_store_registers, | |
90d74c30 | 6080 | linux_prepare_to_access_memory, |
0146f85b | 6081 | linux_done_accessing_memory, |
ce3a066d DJ |
6082 | linux_read_memory, |
6083 | linux_write_memory, | |
2f2893d9 | 6084 | linux_look_up_symbols, |
ef57601b | 6085 | linux_request_interrupt, |
aa691b87 | 6086 | linux_read_auxv, |
802e8e6d | 6087 | linux_supports_z_point_type, |
d993e290 PA |
6088 | linux_insert_point, |
6089 | linux_remove_point, | |
e013ee27 OF |
6090 | linux_stopped_by_watchpoint, |
6091 | linux_stopped_data_address, | |
db0dfaa0 LM |
6092 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6093 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6094 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6095 | linux_read_offsets, |
dae5f5cf DJ |
6096 | #else |
6097 | NULL, | |
6098 | #endif | |
6099 | #ifdef USE_THREAD_DB | |
6100 | thread_db_get_tls_address, | |
6101 | #else | |
6102 | NULL, | |
52fb6437 | 6103 | #endif |
efcbbd14 | 6104 | linux_qxfer_spu, |
59a016f0 | 6105 | hostio_last_error_from_errno, |
07e059b5 | 6106 | linux_qxfer_osdata, |
4aa995e1 | 6107 | linux_xfer_siginfo, |
bd99dc85 PA |
6108 | linux_supports_non_stop, |
6109 | linux_async, | |
6110 | linux_start_non_stop, | |
cdbfd419 PP |
6111 | linux_supports_multi_process, |
6112 | #ifdef USE_THREAD_DB | |
dc146f7c | 6113 | thread_db_handle_monitor_command, |
cdbfd419 | 6114 | #else |
dc146f7c | 6115 | NULL, |
cdbfd419 | 6116 | #endif |
d26e3629 | 6117 | linux_common_core_of_thread, |
78d85199 | 6118 | linux_read_loadmap, |
219f2f23 PA |
6119 | linux_process_qsupported, |
6120 | linux_supports_tracepoints, | |
6121 | linux_read_pc, | |
8336d594 PA |
6122 | linux_write_pc, |
6123 | linux_thread_stopped, | |
7984d532 | 6124 | NULL, |
711e434b | 6125 | linux_pause_all, |
7984d532 | 6126 | linux_unpause_all, |
fa593d66 | 6127 | linux_stabilize_threads, |
6a271cae | 6128 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6129 | linux_emit_ops, |
6130 | linux_supports_disable_randomization, | |
405f8e94 | 6131 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6132 | linux_qxfer_libraries_svr4, |
d1feda86 | 6133 | linux_supports_agent, |
9accd112 MM |
6134 | #ifdef HAVE_LINUX_BTRACE |
6135 | linux_supports_btrace, | |
6136 | linux_low_enable_btrace, | |
969c39fb | 6137 | linux_low_disable_btrace, |
9accd112 | 6138 | linux_low_read_btrace, |
f4abbc16 | 6139 | linux_low_btrace_conf, |
9accd112 MM |
6140 | #else |
6141 | NULL, | |
6142 | NULL, | |
6143 | NULL, | |
6144 | NULL, | |
f4abbc16 | 6145 | NULL, |
9accd112 | 6146 | #endif |
c2d6af84 | 6147 | linux_supports_range_stepping, |
ce3a066d DJ |
6148 | }; |
6149 | ||
0d62e5e8 DJ |
6150 | static void |
6151 | linux_init_signals () | |
6152 | { | |
6153 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6154 | to find what the cancel signal actually is. */ | |
1a981360 | 6155 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6156 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6157 | #endif |
0d62e5e8 DJ |
6158 | } |
6159 | ||
3aee8918 PA |
6160 | #ifdef HAVE_LINUX_REGSETS |
6161 | void | |
6162 | initialize_regsets_info (struct regsets_info *info) | |
6163 | { | |
6164 | for (info->num_regsets = 0; | |
6165 | info->regsets[info->num_regsets].size >= 0; | |
6166 | info->num_regsets++) | |
6167 | ; | |
3aee8918 PA |
6168 | } |
6169 | #endif | |
6170 | ||
da6d8c04 DJ |
6171 | void |
6172 | initialize_low (void) | |
6173 | { | |
bd99dc85 PA |
6174 | struct sigaction sigchld_action; |
6175 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6176 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6177 | set_breakpoint_data (the_low_target.breakpoint, |
6178 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6179 | linux_init_signals (); |
aa7c7447 | 6180 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6181 | |
6182 | sigchld_action.sa_handler = sigchld_handler; | |
6183 | sigemptyset (&sigchld_action.sa_mask); | |
6184 | sigchld_action.sa_flags = SA_RESTART; | |
6185 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6186 | |
6187 | initialize_low_arch (); | |
da6d8c04 | 6188 | } |