Commit | Line | Data |
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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 1995-2015 Free Software Foundation, Inc. |
da6d8c04 DJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
da6d8c04 DJ |
9 | (at your option) any later version. |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
da6d8c04 DJ |
18 | |
19 | #include "server.h" | |
58caa3dc | 20 | #include "linux-low.h" |
125f8a3d | 21 | #include "nat/linux-osdata.h" |
58b4daa5 | 22 | #include "agent.h" |
da6d8c04 | 23 | |
96d7229d LM |
24 | #include "nat/linux-nat.h" |
25 | #include "nat/linux-waitpid.h" | |
8bdce1ff | 26 | #include "gdb_wait.h" |
da6d8c04 | 27 | #include <sys/ptrace.h> |
125f8a3d GB |
28 | #include "nat/linux-ptrace.h" |
29 | #include "nat/linux-procfs.h" | |
8cc73a39 | 30 | #include "nat/linux-personality.h" |
da6d8c04 DJ |
31 | #include <signal.h> |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
0a30fbc4 | 34 | #include <unistd.h> |
fd500816 | 35 | #include <sys/syscall.h> |
f9387fc3 | 36 | #include <sched.h> |
07e059b5 VP |
37 | #include <ctype.h> |
38 | #include <pwd.h> | |
39 | #include <sys/types.h> | |
40 | #include <dirent.h> | |
53ce3c39 | 41 | #include <sys/stat.h> |
efcbbd14 | 42 | #include <sys/vfs.h> |
1570b33e | 43 | #include <sys/uio.h> |
602e3198 | 44 | #include "filestuff.h" |
c144c7a0 | 45 | #include "tracepoint.h" |
533b0600 | 46 | #include "hostio.h" |
957f3f49 DE |
47 | #ifndef ELFMAG0 |
48 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
49 | then ELFMAG0 will have been defined. If it didn't get included by | |
50 | gdb_proc_service.h then including it will likely introduce a duplicate | |
51 | definition of elf_fpregset_t. */ | |
52 | #include <elf.h> | |
53 | #endif | |
efcbbd14 UW |
54 | |
55 | #ifndef SPUFS_MAGIC | |
56 | #define SPUFS_MAGIC 0x23c9b64e | |
57 | #endif | |
da6d8c04 | 58 | |
03583c20 UW |
59 | #ifdef HAVE_PERSONALITY |
60 | # include <sys/personality.h> | |
61 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
62 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
63 | # endif | |
64 | #endif | |
65 | ||
fd462a61 DJ |
66 | #ifndef O_LARGEFILE |
67 | #define O_LARGEFILE 0 | |
68 | #endif | |
69 | ||
ec8ebe72 DE |
70 | #ifndef W_STOPCODE |
71 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
72 | #endif | |
73 | ||
1a981360 PA |
74 | /* This is the kernel's hard limit. Not to be confused with |
75 | SIGRTMIN. */ | |
76 | #ifndef __SIGRTMIN | |
77 | #define __SIGRTMIN 32 | |
78 | #endif | |
79 | ||
db0dfaa0 LM |
80 | /* Some targets did not define these ptrace constants from the start, |
81 | so gdbserver defines them locally here. In the future, these may | |
82 | be removed after they are added to asm/ptrace.h. */ | |
83 | #if !(defined(PT_TEXT_ADDR) \ | |
84 | || defined(PT_DATA_ADDR) \ | |
85 | || defined(PT_TEXT_END_ADDR)) | |
86 | #if defined(__mcoldfire__) | |
87 | /* These are still undefined in 3.10 kernels. */ | |
88 | #define PT_TEXT_ADDR 49*4 | |
89 | #define PT_DATA_ADDR 50*4 | |
90 | #define PT_TEXT_END_ADDR 51*4 | |
91 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
92 | #elif defined(BFIN) | |
93 | #define PT_TEXT_ADDR 220 | |
94 | #define PT_TEXT_END_ADDR 224 | |
95 | #define PT_DATA_ADDR 228 | |
96 | /* These are still undefined in 3.10 kernels. */ | |
97 | #elif defined(__TMS320C6X__) | |
98 | #define PT_TEXT_ADDR (0x10000*4) | |
99 | #define PT_DATA_ADDR (0x10004*4) | |
100 | #define PT_TEXT_END_ADDR (0x10008*4) | |
101 | #endif | |
102 | #endif | |
103 | ||
9accd112 | 104 | #ifdef HAVE_LINUX_BTRACE |
125f8a3d | 105 | # include "nat/linux-btrace.h" |
734b0e4b | 106 | # include "btrace-common.h" |
9accd112 MM |
107 | #endif |
108 | ||
8365dcf5 TJB |
109 | #ifndef HAVE_ELF32_AUXV_T |
110 | /* Copied from glibc's elf.h. */ | |
111 | typedef struct | |
112 | { | |
113 | uint32_t a_type; /* Entry type */ | |
114 | union | |
115 | { | |
116 | uint32_t a_val; /* Integer value */ | |
117 | /* We use to have pointer elements added here. We cannot do that, | |
118 | though, since it does not work when using 32-bit definitions | |
119 | on 64-bit platforms and vice versa. */ | |
120 | } a_un; | |
121 | } Elf32_auxv_t; | |
122 | #endif | |
123 | ||
124 | #ifndef HAVE_ELF64_AUXV_T | |
125 | /* Copied from glibc's elf.h. */ | |
126 | typedef struct | |
127 | { | |
128 | uint64_t a_type; /* Entry type */ | |
129 | union | |
130 | { | |
131 | uint64_t a_val; /* Integer value */ | |
132 | /* We use to have pointer elements added here. We cannot do that, | |
133 | though, since it does not work when using 32-bit definitions | |
134 | on 64-bit platforms and vice versa. */ | |
135 | } a_un; | |
136 | } Elf64_auxv_t; | |
137 | #endif | |
138 | ||
05044653 PA |
139 | /* A list of all unknown processes which receive stop signals. Some |
140 | other process will presumably claim each of these as forked | |
141 | children momentarily. */ | |
24a09b5f | 142 | |
05044653 PA |
143 | struct simple_pid_list |
144 | { | |
145 | /* The process ID. */ | |
146 | int pid; | |
147 | ||
148 | /* The status as reported by waitpid. */ | |
149 | int status; | |
150 | ||
151 | /* Next in chain. */ | |
152 | struct simple_pid_list *next; | |
153 | }; | |
154 | struct simple_pid_list *stopped_pids; | |
155 | ||
156 | /* Trivial list manipulation functions to keep track of a list of new | |
157 | stopped processes. */ | |
158 | ||
159 | static void | |
160 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
161 | { | |
162 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
163 | ||
164 | new_pid->pid = pid; | |
165 | new_pid->status = status; | |
166 | new_pid->next = *listp; | |
167 | *listp = new_pid; | |
168 | } | |
169 | ||
170 | static int | |
171 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
172 | { | |
173 | struct simple_pid_list **p; | |
174 | ||
175 | for (p = listp; *p != NULL; p = &(*p)->next) | |
176 | if ((*p)->pid == pid) | |
177 | { | |
178 | struct simple_pid_list *next = (*p)->next; | |
179 | ||
180 | *statusp = (*p)->status; | |
181 | xfree (*p); | |
182 | *p = next; | |
183 | return 1; | |
184 | } | |
185 | return 0; | |
186 | } | |
24a09b5f | 187 | |
bde24c0a PA |
188 | enum stopping_threads_kind |
189 | { | |
190 | /* Not stopping threads presently. */ | |
191 | NOT_STOPPING_THREADS, | |
192 | ||
193 | /* Stopping threads. */ | |
194 | STOPPING_THREADS, | |
195 | ||
196 | /* Stopping and suspending threads. */ | |
197 | STOPPING_AND_SUSPENDING_THREADS | |
198 | }; | |
199 | ||
200 | /* This is set while stop_all_lwps is in effect. */ | |
201 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
202 | |
203 | /* FIXME make into a target method? */ | |
24a09b5f | 204 | int using_threads = 1; |
24a09b5f | 205 | |
fa593d66 PA |
206 | /* True if we're presently stabilizing threads (moving them out of |
207 | jump pads). */ | |
208 | static int stabilizing_threads; | |
209 | ||
2acc282a | 210 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 211 | int step, int signal, siginfo_t *info); |
2bd7c093 | 212 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
213 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
214 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
fa96cb38 PA |
215 | static int linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
216 | int *wstat, int options); | |
95954743 | 217 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
b3312d80 | 218 | static struct lwp_info *add_lwp (ptid_t ptid); |
c35fafde | 219 | static int linux_stopped_by_watchpoint (void); |
95954743 | 220 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 221 | static void proceed_all_lwps (void); |
d50171e4 | 222 | static int finish_step_over (struct lwp_info *lwp); |
d50171e4 PA |
223 | static int kill_lwp (unsigned long lwpid, int signo); |
224 | ||
582511be PA |
225 | /* When the event-loop is doing a step-over, this points at the thread |
226 | being stepped. */ | |
227 | ptid_t step_over_bkpt; | |
228 | ||
d50171e4 PA |
229 | /* True if the low target can hardware single-step. Such targets |
230 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
231 | ||
232 | static int | |
233 | can_hardware_single_step (void) | |
234 | { | |
235 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
236 | } | |
237 | ||
238 | /* True if the low target supports memory breakpoints. If so, we'll | |
239 | have a GET_PC implementation. */ | |
240 | ||
241 | static int | |
242 | supports_breakpoints (void) | |
243 | { | |
244 | return (the_low_target.get_pc != NULL); | |
245 | } | |
0d62e5e8 | 246 | |
fa593d66 PA |
247 | /* Returns true if this target can support fast tracepoints. This |
248 | does not mean that the in-process agent has been loaded in the | |
249 | inferior. */ | |
250 | ||
251 | static int | |
252 | supports_fast_tracepoints (void) | |
253 | { | |
254 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
255 | } | |
256 | ||
c2d6af84 PA |
257 | /* True if LWP is stopped in its stepping range. */ |
258 | ||
259 | static int | |
260 | lwp_in_step_range (struct lwp_info *lwp) | |
261 | { | |
262 | CORE_ADDR pc = lwp->stop_pc; | |
263 | ||
264 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
265 | } | |
266 | ||
0d62e5e8 DJ |
267 | struct pending_signals |
268 | { | |
269 | int signal; | |
32ca6d61 | 270 | siginfo_t info; |
0d62e5e8 DJ |
271 | struct pending_signals *prev; |
272 | }; | |
611cb4a5 | 273 | |
bd99dc85 PA |
274 | /* The read/write ends of the pipe registered as waitable file in the |
275 | event loop. */ | |
276 | static int linux_event_pipe[2] = { -1, -1 }; | |
277 | ||
278 | /* True if we're currently in async mode. */ | |
279 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
280 | ||
02fc4de7 | 281 | static void send_sigstop (struct lwp_info *lwp); |
fa96cb38 | 282 | static void wait_for_sigstop (void); |
bd99dc85 | 283 | |
d0722149 DE |
284 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
285 | ||
286 | static int | |
214d508e | 287 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 288 | { |
214d508e L |
289 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
290 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
291 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
292 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
293 | { | |
294 | *machine = header->e_machine; | |
295 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
296 | ||
297 | } | |
298 | *machine = EM_NONE; | |
299 | return -1; | |
d0722149 DE |
300 | } |
301 | ||
302 | /* Return non-zero if FILE is a 64-bit ELF file, | |
303 | zero if the file is not a 64-bit ELF file, | |
304 | and -1 if the file is not accessible or doesn't exist. */ | |
305 | ||
be07f1a2 | 306 | static int |
214d508e | 307 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 308 | { |
957f3f49 | 309 | Elf64_Ehdr header; |
d0722149 DE |
310 | int fd; |
311 | ||
312 | fd = open (file, O_RDONLY); | |
313 | if (fd < 0) | |
314 | return -1; | |
315 | ||
316 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
317 | { | |
318 | close (fd); | |
319 | return 0; | |
320 | } | |
321 | close (fd); | |
322 | ||
214d508e | 323 | return elf_64_header_p (&header, machine); |
d0722149 DE |
324 | } |
325 | ||
be07f1a2 PA |
326 | /* Accepts an integer PID; Returns true if the executable PID is |
327 | running is a 64-bit ELF file.. */ | |
328 | ||
329 | int | |
214d508e | 330 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 331 | { |
d8d2a3ee | 332 | char file[PATH_MAX]; |
be07f1a2 PA |
333 | |
334 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 335 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
336 | } |
337 | ||
bd99dc85 PA |
338 | static void |
339 | delete_lwp (struct lwp_info *lwp) | |
340 | { | |
fa96cb38 PA |
341 | struct thread_info *thr = get_lwp_thread (lwp); |
342 | ||
343 | if (debug_threads) | |
344 | debug_printf ("deleting %ld\n", lwpid_of (thr)); | |
345 | ||
346 | remove_thread (thr); | |
aa5ca48f | 347 | free (lwp->arch_private); |
bd99dc85 PA |
348 | free (lwp); |
349 | } | |
350 | ||
95954743 PA |
351 | /* Add a process to the common process list, and set its private |
352 | data. */ | |
353 | ||
354 | static struct process_info * | |
355 | linux_add_process (int pid, int attached) | |
356 | { | |
357 | struct process_info *proc; | |
358 | ||
95954743 | 359 | proc = add_process (pid, attached); |
fe978cb0 | 360 | proc->priv = xcalloc (1, sizeof (*proc->priv)); |
95954743 | 361 | |
3aee8918 | 362 | /* Set the arch when the first LWP stops. */ |
fe978cb0 | 363 | proc->priv->new_inferior = 1; |
3aee8918 | 364 | |
aa5ca48f | 365 | if (the_low_target.new_process != NULL) |
fe978cb0 | 366 | proc->priv->arch_private = the_low_target.new_process (); |
aa5ca48f | 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; | |
3e572f71 PA |
496 | #if USE_SIGTRAP_SIGINFO |
497 | siginfo_t siginfo; | |
498 | #endif | |
d50171e4 PA |
499 | |
500 | if (the_low_target.get_pc == NULL) | |
501 | return 0; | |
0d62e5e8 | 502 | |
582511be PA |
503 | pc = get_pc (lwp); |
504 | sw_breakpoint_pc = pc - the_low_target.decr_pc_after_break; | |
d50171e4 | 505 | |
582511be PA |
506 | /* breakpoint_at reads from the current thread. */ |
507 | saved_thread = current_thread; | |
508 | current_thread = get_lwp_thread (lwp); | |
47c0c975 | 509 | |
3e572f71 PA |
510 | #if USE_SIGTRAP_SIGINFO |
511 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), | |
512 | (PTRACE_TYPE_ARG3) 0, &siginfo) == 0) | |
513 | { | |
514 | if (siginfo.si_signo == SIGTRAP) | |
515 | { | |
516 | if (siginfo.si_code == GDB_ARCH_TRAP_BRKPT) | |
517 | { | |
518 | if (debug_threads) | |
519 | { | |
520 | struct thread_info *thr = get_lwp_thread (lwp); | |
521 | ||
522 | debug_printf ("CSBB: Push back software breakpoint for %s\n", | |
523 | target_pid_to_str (ptid_of (thr))); | |
524 | } | |
525 | ||
526 | /* Back up the PC if necessary. */ | |
527 | if (pc != sw_breakpoint_pc) | |
528 | { | |
529 | struct regcache *regcache | |
530 | = get_thread_regcache (current_thread, 1); | |
531 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
532 | } | |
533 | ||
534 | lwp->stop_pc = sw_breakpoint_pc; | |
535 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
536 | current_thread = saved_thread; | |
537 | return 1; | |
538 | } | |
539 | else if (siginfo.si_code == TRAP_HWBKPT) | |
540 | { | |
541 | if (debug_threads) | |
542 | { | |
543 | struct thread_info *thr = get_lwp_thread (lwp); | |
544 | ||
545 | debug_printf ("CSBB: Push back hardware " | |
546 | "breakpoint/watchpoint for %s\n", | |
547 | target_pid_to_str (ptid_of (thr))); | |
548 | } | |
549 | ||
550 | lwp->stop_pc = pc; | |
551 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
552 | current_thread = saved_thread; | |
553 | return 1; | |
554 | } | |
555 | } | |
556 | } | |
557 | #else | |
582511be PA |
558 | /* We may have just stepped a breakpoint instruction. E.g., in |
559 | non-stop mode, GDB first tells the thread A to step a range, and | |
560 | then the user inserts a breakpoint inside the range. In that | |
8090aef2 PA |
561 | case we need to report the breakpoint PC. */ |
562 | if ((!lwp->stepping || lwp->stop_pc == sw_breakpoint_pc) | |
582511be PA |
563 | && (*the_low_target.breakpoint_at) (sw_breakpoint_pc)) |
564 | { | |
565 | if (debug_threads) | |
566 | { | |
567 | struct thread_info *thr = get_lwp_thread (lwp); | |
568 | ||
569 | debug_printf ("CSBB: %s stopped by software breakpoint\n", | |
570 | target_pid_to_str (ptid_of (thr))); | |
571 | } | |
572 | ||
573 | /* Back up the PC if necessary. */ | |
574 | if (pc != sw_breakpoint_pc) | |
575 | { | |
576 | struct regcache *regcache | |
577 | = get_thread_regcache (current_thread, 1); | |
578 | (*the_low_target.set_pc) (regcache, sw_breakpoint_pc); | |
579 | } | |
580 | ||
581 | lwp->stop_pc = sw_breakpoint_pc; | |
15c66dd6 | 582 | lwp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT; |
582511be PA |
583 | current_thread = saved_thread; |
584 | return 1; | |
585 | } | |
586 | ||
587 | if (hardware_breakpoint_inserted_here (pc)) | |
588 | { | |
589 | if (debug_threads) | |
590 | { | |
591 | struct thread_info *thr = get_lwp_thread (lwp); | |
592 | ||
593 | debug_printf ("CSBB: %s stopped by hardware breakpoint\n", | |
594 | target_pid_to_str (ptid_of (thr))); | |
595 | } | |
47c0c975 | 596 | |
582511be | 597 | lwp->stop_pc = pc; |
15c66dd6 | 598 | lwp->stop_reason = TARGET_STOPPED_BY_HW_BREAKPOINT; |
582511be PA |
599 | current_thread = saved_thread; |
600 | return 1; | |
601 | } | |
3e572f71 | 602 | #endif |
582511be PA |
603 | |
604 | current_thread = saved_thread; | |
605 | return 0; | |
0d62e5e8 | 606 | } |
ce3a066d | 607 | |
b3312d80 | 608 | static struct lwp_info * |
95954743 | 609 | add_lwp (ptid_t ptid) |
611cb4a5 | 610 | { |
54a0b537 | 611 | struct lwp_info *lwp; |
0d62e5e8 | 612 | |
54a0b537 PA |
613 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
614 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 615 | |
aa5ca48f DE |
616 | if (the_low_target.new_thread != NULL) |
617 | lwp->arch_private = the_low_target.new_thread (); | |
618 | ||
f7667f0d | 619 | lwp->thread = add_thread (ptid, lwp); |
0d62e5e8 | 620 | |
54a0b537 | 621 | return lwp; |
0d62e5e8 | 622 | } |
611cb4a5 | 623 | |
da6d8c04 DJ |
624 | /* Start an inferior process and returns its pid. |
625 | ALLARGS is a vector of program-name and args. */ | |
626 | ||
ce3a066d DJ |
627 | static int |
628 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 629 | { |
a6dbe5df | 630 | struct lwp_info *new_lwp; |
da6d8c04 | 631 | int pid; |
95954743 | 632 | ptid_t ptid; |
8cc73a39 SDJ |
633 | struct cleanup *restore_personality |
634 | = maybe_disable_address_space_randomization (disable_randomization); | |
03583c20 | 635 | |
42c81e2a | 636 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
637 | pid = vfork (); |
638 | #else | |
da6d8c04 | 639 | pid = fork (); |
52fb6437 | 640 | #endif |
da6d8c04 DJ |
641 | if (pid < 0) |
642 | perror_with_name ("fork"); | |
643 | ||
644 | if (pid == 0) | |
645 | { | |
602e3198 | 646 | close_most_fds (); |
b8e1b30e | 647 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 648 | |
1a981360 | 649 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 650 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 651 | #endif |
0d62e5e8 | 652 | |
a9fa9f7d DJ |
653 | setpgid (0, 0); |
654 | ||
e0f9f062 DE |
655 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
656 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
657 | Also, redirect stdin to /dev/null. */ | |
658 | if (remote_connection_is_stdio ()) | |
659 | { | |
660 | close (0); | |
661 | open ("/dev/null", O_RDONLY); | |
662 | dup2 (2, 1); | |
3e52c33d JK |
663 | if (write (2, "stdin/stdout redirected\n", |
664 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
665 | { |
666 | /* Errors ignored. */; | |
667 | } | |
e0f9f062 DE |
668 | } |
669 | ||
2b876972 DJ |
670 | execv (program, allargs); |
671 | if (errno == ENOENT) | |
672 | execvp (program, allargs); | |
da6d8c04 DJ |
673 | |
674 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 675 | strerror (errno)); |
da6d8c04 DJ |
676 | fflush (stderr); |
677 | _exit (0177); | |
678 | } | |
679 | ||
8cc73a39 | 680 | do_cleanups (restore_personality); |
03583c20 | 681 | |
95954743 PA |
682 | linux_add_process (pid, 0); |
683 | ||
684 | ptid = ptid_build (pid, pid, 0); | |
685 | new_lwp = add_lwp (ptid); | |
a6dbe5df | 686 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 687 | |
a9fa9f7d | 688 | return pid; |
da6d8c04 DJ |
689 | } |
690 | ||
8784d563 PA |
691 | /* Attach to an inferior process. Returns 0 on success, ERRNO on |
692 | error. */ | |
da6d8c04 | 693 | |
7ae1a6a6 PA |
694 | int |
695 | linux_attach_lwp (ptid_t ptid) | |
da6d8c04 | 696 | { |
54a0b537 | 697 | struct lwp_info *new_lwp; |
7ae1a6a6 | 698 | int lwpid = ptid_get_lwp (ptid); |
611cb4a5 | 699 | |
b8e1b30e | 700 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 701 | != 0) |
7ae1a6a6 | 702 | return errno; |
24a09b5f | 703 | |
b3312d80 | 704 | new_lwp = add_lwp (ptid); |
0d62e5e8 | 705 | |
a6dbe5df PA |
706 | /* We need to wait for SIGSTOP before being able to make the next |
707 | ptrace call on this LWP. */ | |
708 | new_lwp->must_set_ptrace_flags = 1; | |
709 | ||
644cebc9 | 710 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
711 | { |
712 | if (debug_threads) | |
87ce2a04 | 713 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
714 | |
715 | /* The process is definitely stopped. It is in a job control | |
716 | stop, unless the kernel predates the TASK_STOPPED / | |
717 | TASK_TRACED distinction, in which case it might be in a | |
718 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
719 | can kill it, signal it, et cetera. | |
720 | ||
721 | First make sure there is a pending SIGSTOP. Since we are | |
722 | already attached, the process can not transition from stopped | |
723 | to running without a PTRACE_CONT; so we know this signal will | |
724 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
725 | probably already in the queue (unless this kernel is old | |
726 | enough to use TASK_STOPPED for ptrace stops); but since | |
727 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
728 | kill_lwp (lwpid, SIGSTOP); | |
729 | ||
730 | /* Finally, resume the stopped process. This will deliver the | |
731 | SIGSTOP (or a higher priority signal, just like normal | |
732 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 733 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
734 | } |
735 | ||
0d62e5e8 | 736 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
737 | brings it to a halt. |
738 | ||
739 | There are several cases to consider here: | |
740 | ||
741 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 742 | of a new thread that is being created. |
d50171e4 PA |
743 | In this case we should ignore that SIGSTOP and resume the |
744 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 745 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 746 | resume_continue. |
0e21c1ec DE |
747 | |
748 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
749 | to it via attach_inferior. |
750 | In this case we want the process thread to stop. | |
d50171e4 PA |
751 | This is handled by having linux_attach set last_resume_kind == |
752 | resume_stop after we return. | |
e3deef73 LM |
753 | |
754 | If the pid we are attaching to is also the tgid, we attach to and | |
755 | stop all the existing threads. Otherwise, we attach to pid and | |
756 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
757 | |
758 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
759 | existing threads. |
760 | In this case we want the thread to stop. | |
761 | FIXME: This case is currently not properly handled. | |
762 | We should wait for the SIGSTOP but don't. Things work apparently | |
763 | because enough time passes between when we ptrace (ATTACH) and when | |
764 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
765 | |
766 | On the other hand, if we are currently trying to stop all threads, we | |
767 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 768 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
769 | end of the list, and so the new thread has not yet reached |
770 | wait_for_sigstop (but will). */ | |
d50171e4 | 771 | new_lwp->stop_expected = 1; |
0d62e5e8 | 772 | |
7ae1a6a6 | 773 | return 0; |
95954743 PA |
774 | } |
775 | ||
8784d563 PA |
776 | /* Callback for linux_proc_attach_tgid_threads. Attach to PTID if not |
777 | already attached. Returns true if a new LWP is found, false | |
778 | otherwise. */ | |
779 | ||
780 | static int | |
781 | attach_proc_task_lwp_callback (ptid_t ptid) | |
782 | { | |
783 | /* Is this a new thread? */ | |
784 | if (find_thread_ptid (ptid) == NULL) | |
785 | { | |
786 | int lwpid = ptid_get_lwp (ptid); | |
787 | int err; | |
788 | ||
789 | if (debug_threads) | |
790 | debug_printf ("Found new lwp %d\n", lwpid); | |
791 | ||
792 | err = linux_attach_lwp (ptid); | |
793 | ||
794 | /* Be quiet if we simply raced with the thread exiting. EPERM | |
795 | is returned if the thread's task still exists, and is marked | |
796 | as exited or zombie, as well as other conditions, so in that | |
797 | case, confirm the status in /proc/PID/status. */ | |
798 | if (err == ESRCH | |
799 | || (err == EPERM && linux_proc_pid_is_gone (lwpid))) | |
800 | { | |
801 | if (debug_threads) | |
802 | { | |
803 | debug_printf ("Cannot attach to lwp %d: " | |
804 | "thread is gone (%d: %s)\n", | |
805 | lwpid, err, strerror (err)); | |
806 | } | |
807 | } | |
808 | else if (err != 0) | |
809 | { | |
810 | warning (_("Cannot attach to lwp %d: %s"), | |
811 | lwpid, | |
812 | linux_ptrace_attach_fail_reason_string (ptid, err)); | |
813 | } | |
814 | ||
815 | return 1; | |
816 | } | |
817 | return 0; | |
818 | } | |
819 | ||
e3deef73 LM |
820 | /* Attach to PID. If PID is the tgid, attach to it and all |
821 | of its threads. */ | |
822 | ||
c52daf70 | 823 | static int |
a1928bad | 824 | linux_attach (unsigned long pid) |
0d62e5e8 | 825 | { |
7ae1a6a6 PA |
826 | ptid_t ptid = ptid_build (pid, pid, 0); |
827 | int err; | |
828 | ||
e3deef73 LM |
829 | /* Attach to PID. We will check for other threads |
830 | soon. */ | |
7ae1a6a6 PA |
831 | err = linux_attach_lwp (ptid); |
832 | if (err != 0) | |
833 | error ("Cannot attach to process %ld: %s", | |
8784d563 | 834 | pid, linux_ptrace_attach_fail_reason_string (ptid, err)); |
7ae1a6a6 | 835 | |
95954743 | 836 | linux_add_process (pid, 1); |
0d62e5e8 | 837 | |
bd99dc85 PA |
838 | if (!non_stop) |
839 | { | |
8336d594 PA |
840 | struct thread_info *thread; |
841 | ||
842 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
843 | process. It will be collected by wait shortly. */ | |
844 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
845 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 846 | } |
0d62e5e8 | 847 | |
8784d563 PA |
848 | /* We must attach to every LWP. If /proc is mounted, use that to |
849 | find them now. On the one hand, the inferior may be using raw | |
850 | clone instead of using pthreads. On the other hand, even if it | |
851 | is using pthreads, GDB may not be connected yet (thread_db needs | |
852 | to do symbol lookups, through qSymbol). Also, thread_db walks | |
853 | structures in the inferior's address space to find the list of | |
854 | threads/LWPs, and those structures may well be corrupted. Note | |
855 | that once thread_db is loaded, we'll still use it to list threads | |
856 | and associate pthread info with each LWP. */ | |
857 | linux_proc_attach_tgid_threads (pid, attach_proc_task_lwp_callback); | |
95954743 PA |
858 | return 0; |
859 | } | |
860 | ||
861 | struct counter | |
862 | { | |
863 | int pid; | |
864 | int count; | |
865 | }; | |
866 | ||
867 | static int | |
868 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
869 | { | |
870 | struct counter *counter = args; | |
871 | ||
872 | if (ptid_get_pid (entry->id) == counter->pid) | |
873 | { | |
874 | if (++counter->count > 1) | |
875 | return 1; | |
876 | } | |
d61ddec4 | 877 | |
da6d8c04 DJ |
878 | return 0; |
879 | } | |
880 | ||
95954743 | 881 | static int |
fa96cb38 | 882 | last_thread_of_process_p (int pid) |
95954743 | 883 | { |
95954743 | 884 | struct counter counter = { pid , 0 }; |
da6d8c04 | 885 | |
95954743 PA |
886 | return (find_inferior (&all_threads, |
887 | second_thread_of_pid_p, &counter) == NULL); | |
888 | } | |
889 | ||
da84f473 PA |
890 | /* Kill LWP. */ |
891 | ||
892 | static void | |
893 | linux_kill_one_lwp (struct lwp_info *lwp) | |
894 | { | |
d86d4aaf DE |
895 | struct thread_info *thr = get_lwp_thread (lwp); |
896 | int pid = lwpid_of (thr); | |
da84f473 PA |
897 | |
898 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
899 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
900 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
901 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
902 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
903 | per process, not one for each thread. But since we still support | |
904 | linuxthreads, and we also support debugging programs using raw | |
905 | clone without CLONE_THREAD, we send one for each thread. For | |
906 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
907 | about some old kernels where PTRACE_KILL might work better | |
908 | (dubious if there are any such, but that's why it's paranoia), so | |
909 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
910 | everywhere. */ | |
911 | ||
912 | errno = 0; | |
69ff6be5 | 913 | kill_lwp (pid, SIGKILL); |
da84f473 | 914 | if (debug_threads) |
ce9e3fe7 PA |
915 | { |
916 | int save_errno = errno; | |
917 | ||
918 | debug_printf ("LKL: kill_lwp (SIGKILL) %s, 0, 0 (%s)\n", | |
919 | target_pid_to_str (ptid_of (thr)), | |
920 | save_errno ? strerror (save_errno) : "OK"); | |
921 | } | |
da84f473 PA |
922 | |
923 | errno = 0; | |
b8e1b30e | 924 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 925 | if (debug_threads) |
ce9e3fe7 PA |
926 | { |
927 | int save_errno = errno; | |
928 | ||
929 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
930 | target_pid_to_str (ptid_of (thr)), | |
931 | save_errno ? strerror (save_errno) : "OK"); | |
932 | } | |
da84f473 PA |
933 | } |
934 | ||
e76126e8 PA |
935 | /* Kill LWP and wait for it to die. */ |
936 | ||
937 | static void | |
938 | kill_wait_lwp (struct lwp_info *lwp) | |
939 | { | |
940 | struct thread_info *thr = get_lwp_thread (lwp); | |
941 | int pid = ptid_get_pid (ptid_of (thr)); | |
942 | int lwpid = ptid_get_lwp (ptid_of (thr)); | |
943 | int wstat; | |
944 | int res; | |
945 | ||
946 | if (debug_threads) | |
947 | debug_printf ("kwl: killing lwp %d, for pid: %d\n", lwpid, pid); | |
948 | ||
949 | do | |
950 | { | |
951 | linux_kill_one_lwp (lwp); | |
952 | ||
953 | /* Make sure it died. Notes: | |
954 | ||
955 | - The loop is most likely unnecessary. | |
956 | ||
957 | - We don't use linux_wait_for_event as that could delete lwps | |
958 | while we're iterating over them. We're not interested in | |
959 | any pending status at this point, only in making sure all | |
960 | wait status on the kernel side are collected until the | |
961 | process is reaped. | |
962 | ||
963 | - We don't use __WALL here as the __WALL emulation relies on | |
964 | SIGCHLD, and killing a stopped process doesn't generate | |
965 | one, nor an exit status. | |
966 | */ | |
967 | res = my_waitpid (lwpid, &wstat, 0); | |
968 | if (res == -1 && errno == ECHILD) | |
969 | res = my_waitpid (lwpid, &wstat, __WCLONE); | |
970 | } while (res > 0 && WIFSTOPPED (wstat)); | |
971 | ||
972 | gdb_assert (res > 0); | |
973 | } | |
974 | ||
da84f473 PA |
975 | /* Callback for `find_inferior'. Kills an lwp of a given process, |
976 | except the leader. */ | |
95954743 PA |
977 | |
978 | static int | |
da84f473 | 979 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 980 | { |
0d62e5e8 | 981 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 982 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 PA |
983 | int pid = * (int *) args; |
984 | ||
985 | if (ptid_get_pid (entry->id) != pid) | |
986 | return 0; | |
0d62e5e8 | 987 | |
fd500816 DJ |
988 | /* We avoid killing the first thread here, because of a Linux kernel (at |
989 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
990 | the children get a chance to be reaped, it will remain a zombie | |
991 | forever. */ | |
95954743 | 992 | |
d86d4aaf | 993 | if (lwpid_of (thread) == pid) |
95954743 PA |
994 | { |
995 | if (debug_threads) | |
87ce2a04 DE |
996 | debug_printf ("lkop: is last of process %s\n", |
997 | target_pid_to_str (entry->id)); | |
95954743 PA |
998 | return 0; |
999 | } | |
fd500816 | 1000 | |
e76126e8 | 1001 | kill_wait_lwp (lwp); |
95954743 | 1002 | return 0; |
da6d8c04 DJ |
1003 | } |
1004 | ||
95954743 PA |
1005 | static int |
1006 | linux_kill (int pid) | |
0d62e5e8 | 1007 | { |
95954743 | 1008 | struct process_info *process; |
54a0b537 | 1009 | struct lwp_info *lwp; |
fd500816 | 1010 | |
95954743 PA |
1011 | process = find_process_pid (pid); |
1012 | if (process == NULL) | |
1013 | return -1; | |
9d606399 | 1014 | |
f9e39928 PA |
1015 | /* If we're killing a running inferior, make sure it is stopped |
1016 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 1017 | stop_all_lwps (0, NULL); |
f9e39928 | 1018 | |
da84f473 | 1019 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 1020 | |
54a0b537 | 1021 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 1022 | thread in the list, so do so now. */ |
95954743 | 1023 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 1024 | |
784867a5 | 1025 | if (lwp == NULL) |
fd500816 | 1026 | { |
784867a5 | 1027 | if (debug_threads) |
d86d4aaf DE |
1028 | debug_printf ("lk_1: cannot find lwp for pid: %d\n", |
1029 | pid); | |
784867a5 JK |
1030 | } |
1031 | else | |
e76126e8 | 1032 | kill_wait_lwp (lwp); |
2d717e4f | 1033 | |
8336d594 | 1034 | the_target->mourn (process); |
f9e39928 PA |
1035 | |
1036 | /* Since we presently can only stop all lwps of all processes, we | |
1037 | need to unstop lwps of other processes. */ | |
7984d532 | 1038 | unstop_all_lwps (0, NULL); |
95954743 | 1039 | return 0; |
0d62e5e8 DJ |
1040 | } |
1041 | ||
9b224c5e PA |
1042 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1043 | signal the thread last stopped for, which we need to deliver to the | |
1044 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1045 | ||
1046 | static int | |
1047 | get_detach_signal (struct thread_info *thread) | |
1048 | { | |
a493e3e2 | 1049 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1050 | int status; |
1051 | struct lwp_info *lp = get_thread_lwp (thread); | |
1052 | ||
1053 | if (lp->status_pending_p) | |
1054 | status = lp->status_pending; | |
1055 | else | |
1056 | { | |
1057 | /* If the thread had been suspended by gdbserver, and it stopped | |
1058 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1059 | want to deliver that SIGSTOP. */ | |
1060 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1061 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1062 | return 0; |
1063 | ||
1064 | /* Otherwise, we may need to deliver the signal we | |
1065 | intercepted. */ | |
1066 | status = lp->last_status; | |
1067 | } | |
1068 | ||
1069 | if (!WIFSTOPPED (status)) | |
1070 | { | |
1071 | if (debug_threads) | |
87ce2a04 | 1072 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
d86d4aaf | 1073 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1074 | return 0; |
1075 | } | |
1076 | ||
1077 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
89a5711c | 1078 | if (WSTOPSIG (status) == SIGTRAP && linux_is_extended_waitstatus (status)) |
9b224c5e PA |
1079 | { |
1080 | if (debug_threads) | |
87ce2a04 DE |
1081 | debug_printf ("GPS: lwp %s had stopped with extended " |
1082 | "status: no pending signal\n", | |
d86d4aaf | 1083 | target_pid_to_str (ptid_of (thread))); |
9b224c5e PA |
1084 | return 0; |
1085 | } | |
1086 | ||
2ea28649 | 1087 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1088 | |
1089 | if (program_signals_p && !program_signals[signo]) | |
1090 | { | |
1091 | if (debug_threads) | |
87ce2a04 | 1092 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
d86d4aaf | 1093 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1094 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1095 | return 0; |
1096 | } | |
1097 | else if (!program_signals_p | |
1098 | /* If we have no way to know which signals GDB does not | |
1099 | want to have passed to the program, assume | |
1100 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1101 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1102 | { |
1103 | if (debug_threads) | |
87ce2a04 DE |
1104 | debug_printf ("GPS: lwp %s had signal %s, " |
1105 | "but we don't know if we should pass it. " | |
1106 | "Default to not.\n", | |
d86d4aaf | 1107 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1108 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1109 | return 0; |
1110 | } | |
1111 | else | |
1112 | { | |
1113 | if (debug_threads) | |
87ce2a04 | 1114 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
d86d4aaf | 1115 | target_pid_to_str (ptid_of (thread)), |
87ce2a04 | 1116 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1117 | |
1118 | return WSTOPSIG (status); | |
1119 | } | |
1120 | } | |
1121 | ||
95954743 PA |
1122 | static int |
1123 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1124 | { |
1125 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1126 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1127 | int pid = * (int *) args; |
9b224c5e | 1128 | int sig; |
95954743 PA |
1129 | |
1130 | if (ptid_get_pid (entry->id) != pid) | |
1131 | return 0; | |
6ad8ae5c | 1132 | |
9b224c5e | 1133 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1134 | if (lwp->stop_expected) |
ae13219e | 1135 | { |
9b224c5e | 1136 | if (debug_threads) |
87ce2a04 | 1137 | debug_printf ("Sending SIGCONT to %s\n", |
d86d4aaf | 1138 | target_pid_to_str (ptid_of (thread))); |
9b224c5e | 1139 | |
d86d4aaf | 1140 | kill_lwp (lwpid_of (thread), SIGCONT); |
54a0b537 | 1141 | lwp->stop_expected = 0; |
ae13219e DJ |
1142 | } |
1143 | ||
1144 | /* Flush any pending changes to the process's registers. */ | |
d86d4aaf | 1145 | regcache_invalidate_thread (thread); |
ae13219e | 1146 | |
9b224c5e PA |
1147 | /* Pass on any pending signal for this thread. */ |
1148 | sig = get_detach_signal (thread); | |
1149 | ||
ae13219e | 1150 | /* Finally, let it resume. */ |
82bfbe7e PA |
1151 | if (the_low_target.prepare_to_resume != NULL) |
1152 | the_low_target.prepare_to_resume (lwp); | |
d86d4aaf | 1153 | if (ptrace (PTRACE_DETACH, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
b8e1b30e | 1154 | (PTRACE_TYPE_ARG4) (long) sig) < 0) |
9b224c5e | 1155 | error (_("Can't detach %s: %s"), |
d86d4aaf | 1156 | target_pid_to_str (ptid_of (thread)), |
9b224c5e | 1157 | strerror (errno)); |
bd99dc85 PA |
1158 | |
1159 | delete_lwp (lwp); | |
95954743 | 1160 | return 0; |
6ad8ae5c DJ |
1161 | } |
1162 | ||
95954743 PA |
1163 | static int |
1164 | linux_detach (int pid) | |
1165 | { | |
1166 | struct process_info *process; | |
1167 | ||
1168 | process = find_process_pid (pid); | |
1169 | if (process == NULL) | |
1170 | return -1; | |
1171 | ||
f9e39928 PA |
1172 | /* Stop all threads before detaching. First, ptrace requires that |
1173 | the thread is stopped to sucessfully detach. Second, thread_db | |
1174 | may need to uninstall thread event breakpoints from memory, which | |
1175 | only works with a stopped process anyway. */ | |
7984d532 | 1176 | stop_all_lwps (0, NULL); |
f9e39928 | 1177 | |
ca5c370d | 1178 | #ifdef USE_THREAD_DB |
8336d594 | 1179 | thread_db_detach (process); |
ca5c370d PA |
1180 | #endif |
1181 | ||
fa593d66 PA |
1182 | /* Stabilize threads (move out of jump pads). */ |
1183 | stabilize_threads (); | |
1184 | ||
95954743 | 1185 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1186 | |
1187 | the_target->mourn (process); | |
f9e39928 PA |
1188 | |
1189 | /* Since we presently can only stop all lwps of all processes, we | |
1190 | need to unstop lwps of other processes. */ | |
7984d532 | 1191 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1196 | ||
1197 | static int | |
1198 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1199 | { | |
d86d4aaf DE |
1200 | struct thread_info *thread = (struct thread_info *) entry; |
1201 | struct lwp_info *lwp = get_thread_lwp (thread); | |
f9e39928 PA |
1202 | struct process_info *process = proc; |
1203 | ||
d86d4aaf | 1204 | if (pid_of (thread) == pid_of (process)) |
f9e39928 PA |
1205 | delete_lwp (lwp); |
1206 | ||
dd6953e1 | 1207 | return 0; |
6ad8ae5c DJ |
1208 | } |
1209 | ||
8336d594 PA |
1210 | static void |
1211 | linux_mourn (struct process_info *process) | |
1212 | { | |
1213 | struct process_info_private *priv; | |
1214 | ||
1215 | #ifdef USE_THREAD_DB | |
1216 | thread_db_mourn (process); | |
1217 | #endif | |
1218 | ||
d86d4aaf | 1219 | find_inferior (&all_threads, delete_lwp_callback, process); |
f9e39928 | 1220 | |
8336d594 | 1221 | /* Freeing all private data. */ |
fe978cb0 | 1222 | priv = process->priv; |
8336d594 PA |
1223 | free (priv->arch_private); |
1224 | free (priv); | |
fe978cb0 | 1225 | process->priv = NULL; |
505106cd PA |
1226 | |
1227 | remove_process (process); | |
8336d594 PA |
1228 | } |
1229 | ||
444d6139 | 1230 | static void |
95954743 | 1231 | linux_join (int pid) |
444d6139 | 1232 | { |
444d6139 PA |
1233 | int status, ret; |
1234 | ||
1235 | do { | |
95954743 | 1236 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1237 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1238 | break; | |
1239 | } while (ret != -1 || errno != ECHILD); | |
1240 | } | |
1241 | ||
6ad8ae5c | 1242 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1243 | static int |
95954743 | 1244 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1245 | { |
95954743 PA |
1246 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1247 | ||
1248 | /* We assume we always know if a thread exits. If a whole process | |
1249 | exited but we still haven't been able to report it to GDB, we'll | |
1250 | hold on to the last lwp of the dead process. */ | |
1251 | if (lwp != NULL) | |
1252 | return !lwp->dead; | |
0d62e5e8 DJ |
1253 | else |
1254 | return 0; | |
1255 | } | |
1256 | ||
582511be PA |
1257 | /* Return 1 if this lwp still has an interesting status pending. If |
1258 | not (e.g., it had stopped for a breakpoint that is gone), return | |
1259 | false. */ | |
1260 | ||
1261 | static int | |
1262 | thread_still_has_status_pending_p (struct thread_info *thread) | |
1263 | { | |
1264 | struct lwp_info *lp = get_thread_lwp (thread); | |
1265 | ||
1266 | if (!lp->status_pending_p) | |
1267 | return 0; | |
1268 | ||
1269 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1270 | report any status pending the LWP may have. */ | |
1271 | if (thread->last_resume_kind == resume_stop | |
1272 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
1273 | return 0; | |
1274 | ||
1275 | if (thread->last_resume_kind != resume_stop | |
15c66dd6 PA |
1276 | && (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
1277 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
582511be PA |
1278 | { |
1279 | struct thread_info *saved_thread; | |
1280 | CORE_ADDR pc; | |
1281 | int discard = 0; | |
1282 | ||
1283 | gdb_assert (lp->last_status != 0); | |
1284 | ||
1285 | pc = get_pc (lp); | |
1286 | ||
1287 | saved_thread = current_thread; | |
1288 | current_thread = thread; | |
1289 | ||
1290 | if (pc != lp->stop_pc) | |
1291 | { | |
1292 | if (debug_threads) | |
1293 | debug_printf ("PC of %ld changed\n", | |
1294 | lwpid_of (thread)); | |
1295 | discard = 1; | |
1296 | } | |
3e572f71 PA |
1297 | |
1298 | #if !USE_SIGTRAP_SIGINFO | |
15c66dd6 | 1299 | else if (lp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT |
582511be PA |
1300 | && !(*the_low_target.breakpoint_at) (pc)) |
1301 | { | |
1302 | if (debug_threads) | |
1303 | debug_printf ("previous SW breakpoint of %ld gone\n", | |
1304 | lwpid_of (thread)); | |
1305 | discard = 1; | |
1306 | } | |
15c66dd6 | 1307 | else if (lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
582511be PA |
1308 | && !hardware_breakpoint_inserted_here (pc)) |
1309 | { | |
1310 | if (debug_threads) | |
1311 | debug_printf ("previous HW breakpoint of %ld gone\n", | |
1312 | lwpid_of (thread)); | |
1313 | discard = 1; | |
1314 | } | |
3e572f71 | 1315 | #endif |
582511be PA |
1316 | |
1317 | current_thread = saved_thread; | |
1318 | ||
1319 | if (discard) | |
1320 | { | |
1321 | if (debug_threads) | |
1322 | debug_printf ("discarding pending breakpoint status\n"); | |
1323 | lp->status_pending_p = 0; | |
1324 | return 0; | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | return 1; | |
1329 | } | |
1330 | ||
6bf5e0ba | 1331 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1332 | static int |
d50171e4 | 1333 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1334 | { |
d86d4aaf | 1335 | struct thread_info *thread = (struct thread_info *) entry; |
582511be | 1336 | struct lwp_info *lp = get_thread_lwp (thread); |
95954743 PA |
1337 | ptid_t ptid = * (ptid_t *) arg; |
1338 | ||
1339 | /* Check if we're only interested in events from a specific process | |
afa8d396 PA |
1340 | or a specific LWP. */ |
1341 | if (!ptid_match (ptid_of (thread), ptid)) | |
95954743 | 1342 | return 0; |
0d62e5e8 | 1343 | |
582511be PA |
1344 | if (lp->status_pending_p |
1345 | && !thread_still_has_status_pending_p (thread)) | |
1346 | { | |
1347 | linux_resume_one_lwp (lp, lp->stepping, GDB_SIGNAL_0, NULL); | |
1348 | return 0; | |
1349 | } | |
0d62e5e8 | 1350 | |
582511be | 1351 | return lp->status_pending_p; |
0d62e5e8 DJ |
1352 | } |
1353 | ||
95954743 PA |
1354 | static int |
1355 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1356 | { | |
1357 | ptid_t ptid = *(ptid_t *) data; | |
1358 | int lwp; | |
1359 | ||
1360 | if (ptid_get_lwp (ptid) != 0) | |
1361 | lwp = ptid_get_lwp (ptid); | |
1362 | else | |
1363 | lwp = ptid_get_pid (ptid); | |
1364 | ||
1365 | if (ptid_get_lwp (entry->id) == lwp) | |
1366 | return 1; | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | struct lwp_info * | |
1372 | find_lwp_pid (ptid_t ptid) | |
1373 | { | |
d86d4aaf DE |
1374 | struct inferior_list_entry *thread |
1375 | = find_inferior (&all_threads, same_lwp, &ptid); | |
1376 | ||
1377 | if (thread == NULL) | |
1378 | return NULL; | |
1379 | ||
1380 | return get_thread_lwp ((struct thread_info *) thread); | |
95954743 PA |
1381 | } |
1382 | ||
fa96cb38 | 1383 | /* Return the number of known LWPs in the tgid given by PID. */ |
0d62e5e8 | 1384 | |
fa96cb38 PA |
1385 | static int |
1386 | num_lwps (int pid) | |
1387 | { | |
1388 | struct inferior_list_entry *inf, *tmp; | |
1389 | int count = 0; | |
0d62e5e8 | 1390 | |
fa96cb38 | 1391 | ALL_INFERIORS (&all_threads, inf, tmp) |
24a09b5f | 1392 | { |
fa96cb38 PA |
1393 | if (ptid_get_pid (inf->id) == pid) |
1394 | count++; | |
24a09b5f | 1395 | } |
3aee8918 | 1396 | |
fa96cb38 PA |
1397 | return count; |
1398 | } | |
d61ddec4 | 1399 | |
fa96cb38 PA |
1400 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
1401 | their exits until all other threads in the group have exited. */ | |
c3adc08c | 1402 | |
fa96cb38 PA |
1403 | static void |
1404 | check_zombie_leaders (void) | |
1405 | { | |
1406 | struct process_info *proc, *tmp; | |
c3adc08c | 1407 | |
fa96cb38 | 1408 | ALL_PROCESSES (proc, tmp) |
c3adc08c | 1409 | { |
fa96cb38 PA |
1410 | pid_t leader_pid = pid_of (proc); |
1411 | struct lwp_info *leader_lp; | |
c3adc08c | 1412 | |
fa96cb38 | 1413 | leader_lp = find_lwp_pid (pid_to_ptid (leader_pid)); |
c3adc08c | 1414 | |
fa96cb38 PA |
1415 | if (debug_threads) |
1416 | debug_printf ("leader_pid=%d, leader_lp!=NULL=%d, " | |
1417 | "num_lwps=%d, zombie=%d\n", | |
1418 | leader_pid, leader_lp!= NULL, num_lwps (leader_pid), | |
1419 | linux_proc_pid_is_zombie (leader_pid)); | |
1420 | ||
1421 | if (leader_lp != NULL | |
1422 | /* Check if there are other threads in the group, as we may | |
1423 | have raced with the inferior simply exiting. */ | |
1424 | && !last_thread_of_process_p (leader_pid) | |
1425 | && linux_proc_pid_is_zombie (leader_pid)) | |
1426 | { | |
1427 | /* A leader zombie can mean one of two things: | |
1428 | ||
1429 | - It exited, and there's an exit status pending | |
1430 | available, or only the leader exited (not the whole | |
1431 | program). In the latter case, we can't waitpid the | |
1432 | leader's exit status until all other threads are gone. | |
1433 | ||
1434 | - There are 3 or more threads in the group, and a thread | |
1435 | other than the leader exec'd. On an exec, the Linux | |
1436 | kernel destroys all other threads (except the execing | |
1437 | one) in the thread group, and resets the execing thread's | |
1438 | tid to the tgid. No exit notification is sent for the | |
1439 | execing thread -- from the ptracer's perspective, it | |
1440 | appears as though the execing thread just vanishes. | |
1441 | Until we reap all other threads except the leader and the | |
1442 | execing thread, the leader will be zombie, and the | |
1443 | execing thread will be in `D (disc sleep)'. As soon as | |
1444 | all other threads are reaped, the execing thread changes | |
1445 | it's tid to the tgid, and the previous (zombie) leader | |
1446 | vanishes, giving place to the "new" leader. We could try | |
1447 | distinguishing the exit and exec cases, by waiting once | |
1448 | more, and seeing if something comes out, but it doesn't | |
1449 | sound useful. The previous leader _does_ go away, and | |
1450 | we'll re-add the new one once we see the exec event | |
1451 | (which is just the same as what would happen if the | |
1452 | previous leader did exit voluntarily before some other | |
1453 | thread execs). */ | |
c3adc08c | 1454 | |
fa96cb38 PA |
1455 | if (debug_threads) |
1456 | fprintf (stderr, | |
1457 | "CZL: Thread group leader %d zombie " | |
1458 | "(it exited, or another thread execd).\n", | |
1459 | leader_pid); | |
c3adc08c | 1460 | |
fa96cb38 | 1461 | delete_lwp (leader_lp); |
c3adc08c PA |
1462 | } |
1463 | } | |
fa96cb38 | 1464 | } |
c3adc08c | 1465 | |
fa96cb38 PA |
1466 | /* Callback for `find_inferior'. Returns the first LWP that is not |
1467 | stopped. ARG is a PTID filter. */ | |
d50171e4 | 1468 | |
fa96cb38 PA |
1469 | static int |
1470 | not_stopped_callback (struct inferior_list_entry *entry, void *arg) | |
1471 | { | |
1472 | struct thread_info *thr = (struct thread_info *) entry; | |
1473 | struct lwp_info *lwp; | |
1474 | ptid_t filter = *(ptid_t *) arg; | |
47c0c975 | 1475 | |
fa96cb38 PA |
1476 | if (!ptid_match (ptid_of (thr), filter)) |
1477 | return 0; | |
bd99dc85 | 1478 | |
fa96cb38 PA |
1479 | lwp = get_thread_lwp (thr); |
1480 | if (!lwp->stopped) | |
1481 | return 1; | |
1482 | ||
1483 | return 0; | |
0d62e5e8 | 1484 | } |
611cb4a5 | 1485 | |
219f2f23 PA |
1486 | /* This function should only be called if the LWP got a SIGTRAP. |
1487 | ||
1488 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1489 | event was handled, 0 otherwise. */ | |
1490 | ||
1491 | static int | |
1492 | handle_tracepoints (struct lwp_info *lwp) | |
1493 | { | |
1494 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1495 | int tpoint_related_event = 0; | |
1496 | ||
582511be PA |
1497 | gdb_assert (lwp->suspended == 0); |
1498 | ||
7984d532 PA |
1499 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1500 | uninsert tracepoints. To do this, we temporarily pause all | |
1501 | threads, unpatch away, and then unpause threads. We need to make | |
1502 | sure the unpausing doesn't resume LWP too. */ | |
1503 | lwp->suspended++; | |
1504 | ||
219f2f23 PA |
1505 | /* And we need to be sure that any all-threads-stopping doesn't try |
1506 | to move threads out of the jump pads, as it could deadlock the | |
1507 | inferior (LWP could be in the jump pad, maybe even holding the | |
1508 | lock.) */ | |
1509 | ||
1510 | /* Do any necessary step collect actions. */ | |
1511 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1512 | ||
fa593d66 PA |
1513 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1514 | ||
219f2f23 PA |
1515 | /* See if we just hit a tracepoint and do its main collect |
1516 | actions. */ | |
1517 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1518 | ||
7984d532 PA |
1519 | lwp->suspended--; |
1520 | ||
1521 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1522 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1523 | |
219f2f23 PA |
1524 | if (tpoint_related_event) |
1525 | { | |
1526 | if (debug_threads) | |
87ce2a04 | 1527 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1528 | return 1; |
1529 | } | |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | ||
fa593d66 PA |
1534 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1535 | fast tracepoint. */ | |
1536 | ||
1537 | static int | |
1538 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1539 | struct fast_tpoint_collect_status *status) | |
1540 | { | |
1541 | CORE_ADDR thread_area; | |
d86d4aaf | 1542 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1543 | |
1544 | if (the_low_target.get_thread_area == NULL) | |
1545 | return 0; | |
1546 | ||
1547 | /* Get the thread area address. This is used to recognize which | |
1548 | thread is which when tracing with the in-process agent library. | |
1549 | We don't read anything from the address, and treat it as opaque; | |
1550 | it's the address itself that we assume is unique per-thread. */ | |
d86d4aaf | 1551 | if ((*the_low_target.get_thread_area) (lwpid_of (thread), &thread_area) == -1) |
fa593d66 PA |
1552 | return 0; |
1553 | ||
1554 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1555 | } | |
1556 | ||
1557 | /* The reason we resume in the caller, is because we want to be able | |
1558 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1559 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1560 | refuses to resume. */ | |
1561 | ||
1562 | static int | |
1563 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1564 | { | |
0bfdf32f | 1565 | struct thread_info *saved_thread; |
fa593d66 | 1566 | |
0bfdf32f GB |
1567 | saved_thread = current_thread; |
1568 | current_thread = get_lwp_thread (lwp); | |
fa593d66 PA |
1569 | |
1570 | if ((wstat == NULL | |
1571 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1572 | && supports_fast_tracepoints () | |
58b4daa5 | 1573 | && agent_loaded_p ()) |
fa593d66 PA |
1574 | { |
1575 | struct fast_tpoint_collect_status status; | |
1576 | int r; | |
1577 | ||
1578 | if (debug_threads) | |
87ce2a04 DE |
1579 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1580 | "jump pad.\n", | |
0bfdf32f | 1581 | lwpid_of (current_thread)); |
fa593d66 PA |
1582 | |
1583 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1584 | ||
1585 | if (wstat == NULL | |
1586 | || (WSTOPSIG (*wstat) != SIGILL | |
1587 | && WSTOPSIG (*wstat) != SIGFPE | |
1588 | && WSTOPSIG (*wstat) != SIGSEGV | |
1589 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1590 | { | |
1591 | lwp->collecting_fast_tracepoint = r; | |
1592 | ||
1593 | if (r != 0) | |
1594 | { | |
1595 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1596 | { | |
1597 | /* Haven't executed the original instruction yet. | |
1598 | Set breakpoint there, and wait till it's hit, | |
1599 | then single-step until exiting the jump pad. */ | |
1600 | lwp->exit_jump_pad_bkpt | |
1601 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1602 | } | |
1603 | ||
1604 | if (debug_threads) | |
87ce2a04 DE |
1605 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1606 | "the jump pad...it does\n", | |
0bfdf32f GB |
1607 | lwpid_of (current_thread)); |
1608 | current_thread = saved_thread; | |
fa593d66 PA |
1609 | |
1610 | return 1; | |
1611 | } | |
1612 | } | |
1613 | else | |
1614 | { | |
1615 | /* If we get a synchronous signal while collecting, *and* | |
1616 | while executing the (relocated) original instruction, | |
1617 | reset the PC to point at the tpoint address, before | |
1618 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1619 | report the signal to GDB, and pray for the best. */ | |
1620 | ||
1621 | lwp->collecting_fast_tracepoint = 0; | |
1622 | ||
1623 | if (r != 0 | |
1624 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1625 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1626 | { | |
1627 | siginfo_t info; | |
1628 | struct regcache *regcache; | |
1629 | ||
1630 | /* The si_addr on a few signals references the address | |
1631 | of the faulting instruction. Adjust that as | |
1632 | well. */ | |
1633 | if ((WSTOPSIG (*wstat) == SIGILL | |
1634 | || WSTOPSIG (*wstat) == SIGFPE | |
1635 | || WSTOPSIG (*wstat) == SIGBUS | |
1636 | || WSTOPSIG (*wstat) == SIGSEGV) | |
0bfdf32f | 1637 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1638 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1639 | /* Final check just to make sure we don't clobber |
1640 | the siginfo of non-kernel-sent signals. */ | |
1641 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1642 | { | |
1643 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
0bfdf32f | 1644 | ptrace (PTRACE_SETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 1645 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1646 | } |
1647 | ||
0bfdf32f | 1648 | regcache = get_thread_regcache (current_thread, 1); |
fa593d66 PA |
1649 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); |
1650 | lwp->stop_pc = status.tpoint_addr; | |
1651 | ||
1652 | /* Cancel any fast tracepoint lock this thread was | |
1653 | holding. */ | |
1654 | force_unlock_trace_buffer (); | |
1655 | } | |
1656 | ||
1657 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1658 | { | |
1659 | if (debug_threads) | |
87ce2a04 DE |
1660 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1661 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1662 | |
1663 | stop_all_lwps (1, lwp); | |
fa593d66 PA |
1664 | |
1665 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1666 | lwp->exit_jump_pad_bkpt = NULL; | |
1667 | ||
1668 | unstop_all_lwps (1, lwp); | |
1669 | ||
1670 | gdb_assert (lwp->suspended >= 0); | |
1671 | } | |
1672 | } | |
1673 | } | |
1674 | ||
1675 | if (debug_threads) | |
87ce2a04 DE |
1676 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1677 | "jump pad...no\n", | |
0bfdf32f | 1678 | lwpid_of (current_thread)); |
0cccb683 | 1679 | |
0bfdf32f | 1680 | current_thread = saved_thread; |
fa593d66 PA |
1681 | return 0; |
1682 | } | |
1683 | ||
1684 | /* Enqueue one signal in the "signals to report later when out of the | |
1685 | jump pad" list. */ | |
1686 | ||
1687 | static void | |
1688 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1689 | { | |
1690 | struct pending_signals *p_sig; | |
d86d4aaf | 1691 | struct thread_info *thread = get_lwp_thread (lwp); |
fa593d66 PA |
1692 | |
1693 | if (debug_threads) | |
87ce2a04 | 1694 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
d86d4aaf | 1695 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1696 | |
1697 | if (debug_threads) | |
1698 | { | |
1699 | struct pending_signals *sig; | |
1700 | ||
1701 | for (sig = lwp->pending_signals_to_report; | |
1702 | sig != NULL; | |
1703 | sig = sig->prev) | |
87ce2a04 DE |
1704 | debug_printf (" Already queued %d\n", |
1705 | sig->signal); | |
fa593d66 | 1706 | |
87ce2a04 | 1707 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1708 | } |
1709 | ||
1a981360 PA |
1710 | /* Don't enqueue non-RT signals if they are already in the deferred |
1711 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1712 | twice) */ | |
1713 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1714 | { | |
1715 | struct pending_signals *sig; | |
1716 | ||
1717 | for (sig = lwp->pending_signals_to_report; | |
1718 | sig != NULL; | |
1719 | sig = sig->prev) | |
1720 | { | |
1721 | if (sig->signal == WSTOPSIG (*wstat)) | |
1722 | { | |
1723 | if (debug_threads) | |
87ce2a04 DE |
1724 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1725 | " for LWP %ld\n", | |
1726 | sig->signal, | |
d86d4aaf | 1727 | lwpid_of (thread)); |
1a981360 PA |
1728 | return; |
1729 | } | |
1730 | } | |
1731 | } | |
1732 | ||
fa593d66 PA |
1733 | p_sig = xmalloc (sizeof (*p_sig)); |
1734 | p_sig->prev = lwp->pending_signals_to_report; | |
1735 | p_sig->signal = WSTOPSIG (*wstat); | |
1736 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
d86d4aaf | 1737 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1738 | &p_sig->info); |
fa593d66 PA |
1739 | |
1740 | lwp->pending_signals_to_report = p_sig; | |
1741 | } | |
1742 | ||
1743 | /* Dequeue one signal from the "signals to report later when out of | |
1744 | the jump pad" list. */ | |
1745 | ||
1746 | static int | |
1747 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1748 | { | |
d86d4aaf DE |
1749 | struct thread_info *thread = get_lwp_thread (lwp); |
1750 | ||
fa593d66 PA |
1751 | if (lwp->pending_signals_to_report != NULL) |
1752 | { | |
1753 | struct pending_signals **p_sig; | |
1754 | ||
1755 | p_sig = &lwp->pending_signals_to_report; | |
1756 | while ((*p_sig)->prev != NULL) | |
1757 | p_sig = &(*p_sig)->prev; | |
1758 | ||
1759 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1760 | if ((*p_sig)->info.si_signo != 0) | |
d86d4aaf | 1761 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1762 | &(*p_sig)->info); |
fa593d66 PA |
1763 | free (*p_sig); |
1764 | *p_sig = NULL; | |
1765 | ||
1766 | if (debug_threads) | |
87ce2a04 | 1767 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
d86d4aaf | 1768 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
1769 | |
1770 | if (debug_threads) | |
1771 | { | |
1772 | struct pending_signals *sig; | |
1773 | ||
1774 | for (sig = lwp->pending_signals_to_report; | |
1775 | sig != NULL; | |
1776 | sig = sig->prev) | |
87ce2a04 DE |
1777 | debug_printf (" Still queued %d\n", |
1778 | sig->signal); | |
fa593d66 | 1779 | |
87ce2a04 | 1780 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1781 | } |
1782 | ||
1783 | return 1; | |
1784 | } | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
582511be PA |
1789 | /* Fetch the possibly triggered data watchpoint info and store it in |
1790 | CHILD. | |
d50171e4 | 1791 | |
582511be PA |
1792 | On some archs, like x86, that use debug registers to set |
1793 | watchpoints, it's possible that the way to know which watched | |
1794 | address trapped, is to check the register that is used to select | |
1795 | which address to watch. Problem is, between setting the watchpoint | |
1796 | and reading back which data address trapped, the user may change | |
1797 | the set of watchpoints, and, as a consequence, GDB changes the | |
1798 | debug registers in the inferior. To avoid reading back a stale | |
1799 | stopped-data-address when that happens, we cache in LP the fact | |
1800 | that a watchpoint trapped, and the corresponding data address, as | |
1801 | soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug | |
1802 | registers meanwhile, we have the cached data we can rely on. */ | |
d50171e4 | 1803 | |
582511be PA |
1804 | static int |
1805 | check_stopped_by_watchpoint (struct lwp_info *child) | |
1806 | { | |
1807 | if (the_low_target.stopped_by_watchpoint != NULL) | |
d50171e4 | 1808 | { |
582511be | 1809 | struct thread_info *saved_thread; |
d50171e4 | 1810 | |
582511be PA |
1811 | saved_thread = current_thread; |
1812 | current_thread = get_lwp_thread (child); | |
1813 | ||
1814 | if (the_low_target.stopped_by_watchpoint ()) | |
d50171e4 | 1815 | { |
15c66dd6 | 1816 | child->stop_reason = TARGET_STOPPED_BY_WATCHPOINT; |
582511be PA |
1817 | |
1818 | if (the_low_target.stopped_data_address != NULL) | |
1819 | child->stopped_data_address | |
1820 | = the_low_target.stopped_data_address (); | |
1821 | else | |
1822 | child->stopped_data_address = 0; | |
d50171e4 PA |
1823 | } |
1824 | ||
0bfdf32f | 1825 | current_thread = saved_thread; |
d50171e4 PA |
1826 | } |
1827 | ||
15c66dd6 | 1828 | return child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
c4d9ceb6 YQ |
1829 | } |
1830 | ||
fa96cb38 PA |
1831 | /* Do low-level handling of the event, and check if we should go on |
1832 | and pass it to caller code. Return the affected lwp if we are, or | |
1833 | NULL otherwise. */ | |
1834 | ||
1835 | static struct lwp_info * | |
582511be | 1836 | linux_low_filter_event (int lwpid, int wstat) |
fa96cb38 PA |
1837 | { |
1838 | struct lwp_info *child; | |
1839 | struct thread_info *thread; | |
582511be | 1840 | int have_stop_pc = 0; |
fa96cb38 PA |
1841 | |
1842 | child = find_lwp_pid (pid_to_ptid (lwpid)); | |
1843 | ||
1844 | /* If we didn't find a process, one of two things presumably happened: | |
1845 | - A process we started and then detached from has exited. Ignore it. | |
1846 | - A process we are controlling has forked and the new child's stop | |
1847 | was reported to us by the kernel. Save its PID. */ | |
1848 | if (child == NULL && WIFSTOPPED (wstat)) | |
1849 | { | |
1850 | add_to_pid_list (&stopped_pids, lwpid, wstat); | |
1851 | return NULL; | |
1852 | } | |
1853 | else if (child == NULL) | |
1854 | return NULL; | |
1855 | ||
1856 | thread = get_lwp_thread (child); | |
1857 | ||
1858 | child->stopped = 1; | |
1859 | ||
1860 | child->last_status = wstat; | |
1861 | ||
582511be PA |
1862 | /* Check if the thread has exited. */ |
1863 | if ((WIFEXITED (wstat) || WIFSIGNALED (wstat))) | |
1864 | { | |
1865 | if (debug_threads) | |
1866 | debug_printf ("LLFE: %d exited.\n", lwpid); | |
1867 | if (num_lwps (pid_of (thread)) > 1) | |
1868 | { | |
1869 | ||
1870 | /* If there is at least one more LWP, then the exit signal was | |
1871 | not the end of the debugged application and should be | |
1872 | ignored. */ | |
1873 | delete_lwp (child); | |
1874 | return NULL; | |
1875 | } | |
1876 | else | |
1877 | { | |
1878 | /* This was the last lwp in the process. Since events are | |
1879 | serialized to GDB core, and we can't report this one | |
1880 | right now, but GDB core and the other target layers will | |
1881 | want to be notified about the exit code/signal, leave the | |
1882 | status pending for the next time we're able to report | |
1883 | it. */ | |
1884 | mark_lwp_dead (child, wstat); | |
1885 | return child; | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | gdb_assert (WIFSTOPPED (wstat)); | |
1890 | ||
fa96cb38 PA |
1891 | if (WIFSTOPPED (wstat)) |
1892 | { | |
1893 | struct process_info *proc; | |
1894 | ||
1895 | /* Architecture-specific setup after inferior is running. This | |
1896 | needs to happen after we have attached to the inferior and it | |
1897 | is stopped for the first time, but before we access any | |
1898 | inferior registers. */ | |
1899 | proc = find_process_pid (pid_of (thread)); | |
fe978cb0 | 1900 | if (proc->priv->new_inferior) |
fa96cb38 | 1901 | { |
0bfdf32f | 1902 | struct thread_info *saved_thread; |
fa96cb38 | 1903 | |
0bfdf32f GB |
1904 | saved_thread = current_thread; |
1905 | current_thread = thread; | |
fa96cb38 PA |
1906 | |
1907 | the_low_target.arch_setup (); | |
1908 | ||
0bfdf32f | 1909 | current_thread = saved_thread; |
fa96cb38 | 1910 | |
fe978cb0 | 1911 | proc->priv->new_inferior = 0; |
fa96cb38 PA |
1912 | } |
1913 | } | |
1914 | ||
fa96cb38 PA |
1915 | if (WIFSTOPPED (wstat) && child->must_set_ptrace_flags) |
1916 | { | |
beed38b8 JB |
1917 | struct process_info *proc = find_process_pid (pid_of (thread)); |
1918 | ||
1919 | linux_enable_event_reporting (lwpid, proc->attached); | |
fa96cb38 PA |
1920 | child->must_set_ptrace_flags = 0; |
1921 | } | |
1922 | ||
582511be PA |
1923 | /* Be careful to not overwrite stop_pc until |
1924 | check_stopped_by_breakpoint is called. */ | |
fa96cb38 | 1925 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP |
89a5711c | 1926 | && linux_is_extended_waitstatus (wstat)) |
fa96cb38 | 1927 | { |
582511be | 1928 | child->stop_pc = get_pc (child); |
fa96cb38 PA |
1929 | handle_extended_wait (child, wstat); |
1930 | return NULL; | |
1931 | } | |
1932 | ||
3e572f71 PA |
1933 | /* Check first whether this was a SW/HW breakpoint before checking |
1934 | watchpoints, because at least s390 can't tell the data address of | |
1935 | hardware watchpoint hits, and returns stopped-by-watchpoint as | |
1936 | long as there's a watchpoint set. */ | |
1937 | if (WIFSTOPPED (wstat) && linux_wstatus_maybe_breakpoint (wstat)) | |
582511be PA |
1938 | { |
1939 | if (check_stopped_by_breakpoint (child)) | |
1940 | have_stop_pc = 1; | |
1941 | } | |
1942 | ||
3e572f71 PA |
1943 | /* Note that TRAP_HWBKPT can indicate either a hardware breakpoint |
1944 | or hardware watchpoint. Check which is which if we got | |
1945 | TARGET_STOPPED_BY_HW_BREAKPOINT. */ | |
1946 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP | |
1947 | && (child->stop_reason == TARGET_STOPPED_BY_NO_REASON | |
1948 | || child->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
1949 | check_stopped_by_watchpoint (child); | |
1950 | ||
582511be PA |
1951 | if (!have_stop_pc) |
1952 | child->stop_pc = get_pc (child); | |
1953 | ||
fa96cb38 PA |
1954 | if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGSTOP |
1955 | && child->stop_expected) | |
1956 | { | |
1957 | if (debug_threads) | |
1958 | debug_printf ("Expected stop.\n"); | |
1959 | child->stop_expected = 0; | |
1960 | ||
1961 | if (thread->last_resume_kind == resume_stop) | |
1962 | { | |
1963 | /* We want to report the stop to the core. Treat the | |
1964 | SIGSTOP as a normal event. */ | |
1965 | } | |
1966 | else if (stopping_threads != NOT_STOPPING_THREADS) | |
1967 | { | |
1968 | /* Stopping threads. We don't want this SIGSTOP to end up | |
582511be | 1969 | pending. */ |
fa96cb38 PA |
1970 | return NULL; |
1971 | } | |
1972 | else | |
1973 | { | |
1974 | /* Filter out the event. */ | |
1975 | linux_resume_one_lwp (child, child->stepping, 0, NULL); | |
1976 | return NULL; | |
1977 | } | |
1978 | } | |
1979 | ||
582511be PA |
1980 | child->status_pending_p = 1; |
1981 | child->status_pending = wstat; | |
fa96cb38 PA |
1982 | return child; |
1983 | } | |
1984 | ||
20ba1ce6 PA |
1985 | /* Resume LWPs that are currently stopped without any pending status |
1986 | to report, but are resumed from the core's perspective. */ | |
1987 | ||
1988 | static void | |
1989 | resume_stopped_resumed_lwps (struct inferior_list_entry *entry) | |
1990 | { | |
1991 | struct thread_info *thread = (struct thread_info *) entry; | |
1992 | struct lwp_info *lp = get_thread_lwp (thread); | |
1993 | ||
1994 | if (lp->stopped | |
1995 | && !lp->status_pending_p | |
1996 | && thread->last_resume_kind != resume_stop | |
1997 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE) | |
1998 | { | |
1999 | int step = thread->last_resume_kind == resume_step; | |
2000 | ||
2001 | if (debug_threads) | |
2002 | debug_printf ("RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", | |
2003 | target_pid_to_str (ptid_of (thread)), | |
2004 | paddress (lp->stop_pc), | |
2005 | step); | |
2006 | ||
2007 | linux_resume_one_lwp (lp, step, GDB_SIGNAL_0, NULL); | |
2008 | } | |
2009 | } | |
2010 | ||
fa96cb38 PA |
2011 | /* Wait for an event from child(ren) WAIT_PTID, and return any that |
2012 | match FILTER_PTID (leaving others pending). The PTIDs can be: | |
2013 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2014 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2015 | the stop status through the status pointer WSTAT. OPTIONS is | |
2016 | passed to the waitpid call. Return 0 if no event was found and | |
2017 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2018 | was found. Return the PID of the stopped child otherwise. */ | |
bd99dc85 | 2019 | |
0d62e5e8 | 2020 | static int |
fa96cb38 PA |
2021 | linux_wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid, |
2022 | int *wstatp, int options) | |
0d62e5e8 | 2023 | { |
d86d4aaf | 2024 | struct thread_info *event_thread; |
d50171e4 | 2025 | struct lwp_info *event_child, *requested_child; |
fa96cb38 | 2026 | sigset_t block_mask, prev_mask; |
d50171e4 | 2027 | |
fa96cb38 | 2028 | retry: |
d86d4aaf DE |
2029 | /* N.B. event_thread points to the thread_info struct that contains |
2030 | event_child. Keep them in sync. */ | |
2031 | event_thread = NULL; | |
d50171e4 PA |
2032 | event_child = NULL; |
2033 | requested_child = NULL; | |
0d62e5e8 | 2034 | |
95954743 | 2035 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 2036 | |
fa96cb38 | 2037 | if (ptid_equal (filter_ptid, minus_one_ptid) || ptid_is_pid (filter_ptid)) |
0d62e5e8 | 2038 | { |
d86d4aaf | 2039 | event_thread = (struct thread_info *) |
fa96cb38 | 2040 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); |
d86d4aaf DE |
2041 | if (event_thread != NULL) |
2042 | event_child = get_thread_lwp (event_thread); | |
2043 | if (debug_threads && event_thread) | |
2044 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_thread)); | |
0d62e5e8 | 2045 | } |
fa96cb38 | 2046 | else if (!ptid_equal (filter_ptid, null_ptid)) |
0d62e5e8 | 2047 | { |
fa96cb38 | 2048 | requested_child = find_lwp_pid (filter_ptid); |
d50171e4 | 2049 | |
bde24c0a | 2050 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
2051 | && requested_child->status_pending_p |
2052 | && requested_child->collecting_fast_tracepoint) | |
2053 | { | |
2054 | enqueue_one_deferred_signal (requested_child, | |
2055 | &requested_child->status_pending); | |
2056 | requested_child->status_pending_p = 0; | |
2057 | requested_child->status_pending = 0; | |
2058 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
2059 | } | |
2060 | ||
2061 | if (requested_child->suspended | |
2062 | && requested_child->status_pending_p) | |
38e08fca GB |
2063 | { |
2064 | internal_error (__FILE__, __LINE__, | |
2065 | "requesting an event out of a" | |
2066 | " suspended child?"); | |
2067 | } | |
fa593d66 | 2068 | |
d50171e4 | 2069 | if (requested_child->status_pending_p) |
d86d4aaf DE |
2070 | { |
2071 | event_child = requested_child; | |
2072 | event_thread = get_lwp_thread (event_child); | |
2073 | } | |
0d62e5e8 | 2074 | } |
611cb4a5 | 2075 | |
0d62e5e8 DJ |
2076 | if (event_child != NULL) |
2077 | { | |
bd99dc85 | 2078 | if (debug_threads) |
87ce2a04 | 2079 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
d86d4aaf | 2080 | lwpid_of (event_thread), event_child->status_pending); |
fa96cb38 | 2081 | *wstatp = event_child->status_pending; |
bd99dc85 PA |
2082 | event_child->status_pending_p = 0; |
2083 | event_child->status_pending = 0; | |
0bfdf32f | 2084 | current_thread = event_thread; |
d86d4aaf | 2085 | return lwpid_of (event_thread); |
0d62e5e8 DJ |
2086 | } |
2087 | ||
fa96cb38 PA |
2088 | /* But if we don't find a pending event, we'll have to wait. |
2089 | ||
2090 | We only enter this loop if no process has a pending wait status. | |
2091 | Thus any action taken in response to a wait status inside this | |
2092 | loop is responding as soon as we detect the status, not after any | |
2093 | pending events. */ | |
d8301ad1 | 2094 | |
fa96cb38 PA |
2095 | /* Make sure SIGCHLD is blocked until the sigsuspend below. Block |
2096 | all signals while here. */ | |
2097 | sigfillset (&block_mask); | |
2098 | sigprocmask (SIG_BLOCK, &block_mask, &prev_mask); | |
2099 | ||
582511be PA |
2100 | /* Always pull all events out of the kernel. We'll randomly select |
2101 | an event LWP out of all that have events, to prevent | |
2102 | starvation. */ | |
fa96cb38 | 2103 | while (event_child == NULL) |
0d62e5e8 | 2104 | { |
fa96cb38 | 2105 | pid_t ret = 0; |
0d62e5e8 | 2106 | |
fa96cb38 PA |
2107 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
2108 | quirks: | |
0d62e5e8 | 2109 | |
fa96cb38 PA |
2110 | - If the thread group leader exits while other threads in the |
2111 | thread group still exist, waitpid(TGID, ...) hangs. That | |
2112 | waitpid won't return an exit status until the other threads | |
2113 | in the group are reaped. | |
611cb4a5 | 2114 | |
fa96cb38 PA |
2115 | - When a non-leader thread execs, that thread just vanishes |
2116 | without reporting an exit (so we'd hang if we waited for it | |
2117 | explicitly in that case). The exec event is reported to | |
2118 | the TGID pid (although we don't currently enable exec | |
2119 | events). */ | |
2120 | errno = 0; | |
2121 | ret = my_waitpid (-1, wstatp, options | WNOHANG); | |
d8301ad1 | 2122 | |
fa96cb38 PA |
2123 | if (debug_threads) |
2124 | debug_printf ("LWFE: waitpid(-1, ...) returned %d, %s\n", | |
2125 | ret, errno ? strerror (errno) : "ERRNO-OK"); | |
0d62e5e8 | 2126 | |
fa96cb38 | 2127 | if (ret > 0) |
0d62e5e8 | 2128 | { |
89be2091 | 2129 | if (debug_threads) |
bd99dc85 | 2130 | { |
fa96cb38 PA |
2131 | debug_printf ("LLW: waitpid %ld received %s\n", |
2132 | (long) ret, status_to_str (*wstatp)); | |
bd99dc85 | 2133 | } |
89be2091 | 2134 | |
582511be PA |
2135 | /* Filter all events. IOW, leave all events pending. We'll |
2136 | randomly select an event LWP out of all that have events | |
2137 | below. */ | |
2138 | linux_low_filter_event (ret, *wstatp); | |
fa96cb38 PA |
2139 | /* Retry until nothing comes out of waitpid. A single |
2140 | SIGCHLD can indicate more than one child stopped. */ | |
89be2091 DJ |
2141 | continue; |
2142 | } | |
2143 | ||
20ba1ce6 PA |
2144 | /* Now that we've pulled all events out of the kernel, resume |
2145 | LWPs that don't have an interesting event to report. */ | |
2146 | if (stopping_threads == NOT_STOPPING_THREADS) | |
2147 | for_each_inferior (&all_threads, resume_stopped_resumed_lwps); | |
2148 | ||
2149 | /* ... and find an LWP with a status to report to the core, if | |
2150 | any. */ | |
582511be PA |
2151 | event_thread = (struct thread_info *) |
2152 | find_inferior (&all_threads, status_pending_p_callback, &filter_ptid); | |
2153 | if (event_thread != NULL) | |
2154 | { | |
2155 | event_child = get_thread_lwp (event_thread); | |
2156 | *wstatp = event_child->status_pending; | |
2157 | event_child->status_pending_p = 0; | |
2158 | event_child->status_pending = 0; | |
2159 | break; | |
2160 | } | |
2161 | ||
fa96cb38 PA |
2162 | /* Check for zombie thread group leaders. Those can't be reaped |
2163 | until all other threads in the thread group are. */ | |
2164 | check_zombie_leaders (); | |
2165 | ||
2166 | /* If there are no resumed children left in the set of LWPs we | |
2167 | want to wait for, bail. We can't just block in | |
2168 | waitpid/sigsuspend, because lwps might have been left stopped | |
2169 | in trace-stop state, and we'd be stuck forever waiting for | |
2170 | their status to change (which would only happen if we resumed | |
2171 | them). Even if WNOHANG is set, this return code is preferred | |
2172 | over 0 (below), as it is more detailed. */ | |
2173 | if ((find_inferior (&all_threads, | |
2174 | not_stopped_callback, | |
2175 | &wait_ptid) == NULL)) | |
a6dbe5df | 2176 | { |
fa96cb38 PA |
2177 | if (debug_threads) |
2178 | debug_printf ("LLW: exit (no unwaited-for LWP)\n"); | |
2179 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2180 | return -1; | |
a6dbe5df PA |
2181 | } |
2182 | ||
fa96cb38 PA |
2183 | /* No interesting event to report to the caller. */ |
2184 | if ((options & WNOHANG)) | |
24a09b5f | 2185 | { |
fa96cb38 PA |
2186 | if (debug_threads) |
2187 | debug_printf ("WNOHANG set, no event found\n"); | |
2188 | ||
2189 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2190 | return 0; | |
24a09b5f DJ |
2191 | } |
2192 | ||
fa96cb38 PA |
2193 | /* Block until we get an event reported with SIGCHLD. */ |
2194 | if (debug_threads) | |
2195 | debug_printf ("sigsuspend'ing\n"); | |
d50171e4 | 2196 | |
fa96cb38 PA |
2197 | sigsuspend (&prev_mask); |
2198 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); | |
2199 | goto retry; | |
2200 | } | |
d50171e4 | 2201 | |
fa96cb38 | 2202 | sigprocmask (SIG_SETMASK, &prev_mask, NULL); |
d50171e4 | 2203 | |
0bfdf32f | 2204 | current_thread = event_thread; |
d50171e4 | 2205 | |
fa96cb38 PA |
2206 | /* Check for thread exit. */ |
2207 | if (! WIFSTOPPED (*wstatp)) | |
2208 | { | |
2209 | gdb_assert (last_thread_of_process_p (pid_of (event_thread))); | |
2210 | ||
2211 | if (debug_threads) | |
2212 | debug_printf ("LWP %d is the last lwp of process. " | |
2213 | "Process %ld exiting.\n", | |
2214 | pid_of (event_thread), lwpid_of (event_thread)); | |
d86d4aaf | 2215 | return lwpid_of (event_thread); |
611cb4a5 | 2216 | } |
0d62e5e8 | 2217 | |
fa96cb38 PA |
2218 | return lwpid_of (event_thread); |
2219 | } | |
2220 | ||
2221 | /* Wait for an event from child(ren) PTID. PTIDs can be: | |
2222 | minus_one_ptid, to specify any child; a pid PTID, specifying all | |
2223 | lwps of a thread group; or a PTID representing a single lwp. Store | |
2224 | the stop status through the status pointer WSTAT. OPTIONS is | |
2225 | passed to the waitpid call. Return 0 if no event was found and | |
2226 | OPTIONS contains WNOHANG. Return -1 if no unwaited-for children | |
2227 | was found. Return the PID of the stopped child otherwise. */ | |
2228 | ||
2229 | static int | |
2230 | linux_wait_for_event (ptid_t ptid, int *wstatp, int options) | |
2231 | { | |
2232 | return linux_wait_for_event_filtered (ptid, ptid, wstatp, options); | |
611cb4a5 DJ |
2233 | } |
2234 | ||
6bf5e0ba PA |
2235 | /* Count the LWP's that have had events. */ |
2236 | ||
2237 | static int | |
2238 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
2239 | { | |
d86d4aaf | 2240 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2241 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2242 | int *count = data; |
2243 | ||
2244 | gdb_assert (count != NULL); | |
2245 | ||
582511be | 2246 | /* Count only resumed LWPs that have an event pending. */ |
8336d594 | 2247 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2248 | && lp->status_pending_p) |
6bf5e0ba PA |
2249 | (*count)++; |
2250 | ||
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2255 | ||
2256 | static int | |
2257 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2258 | { | |
d86d4aaf DE |
2259 | struct thread_info *thread = (struct thread_info *) entry; |
2260 | struct lwp_info *lp = get_thread_lwp (thread); | |
6bf5e0ba | 2261 | |
8336d594 PA |
2262 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
2263 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
2264 | && lp->status_pending_p) |
2265 | return 1; | |
2266 | else | |
2267 | return 0; | |
2268 | } | |
2269 | ||
b90fc188 | 2270 | /* Select the Nth LWP that has had an event. */ |
6bf5e0ba PA |
2271 | |
2272 | static int | |
2273 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2274 | { | |
d86d4aaf | 2275 | struct thread_info *thread = (struct thread_info *) entry; |
8bf3b159 | 2276 | struct lwp_info *lp = get_thread_lwp (thread); |
6bf5e0ba PA |
2277 | int *selector = data; |
2278 | ||
2279 | gdb_assert (selector != NULL); | |
2280 | ||
582511be | 2281 | /* Select only resumed LWPs that have an event pending. */ |
91baf43f | 2282 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
8bf3b159 | 2283 | && lp->status_pending_p) |
6bf5e0ba PA |
2284 | if ((*selector)-- == 0) |
2285 | return 1; | |
2286 | ||
2287 | return 0; | |
2288 | } | |
2289 | ||
6bf5e0ba PA |
2290 | /* Select one LWP out of those that have events pending. */ |
2291 | ||
2292 | static void | |
2293 | select_event_lwp (struct lwp_info **orig_lp) | |
2294 | { | |
2295 | int num_events = 0; | |
2296 | int random_selector; | |
582511be PA |
2297 | struct thread_info *event_thread = NULL; |
2298 | ||
2299 | /* In all-stop, give preference to the LWP that is being | |
2300 | single-stepped. There will be at most one, and it's the LWP that | |
2301 | the core is most interested in. If we didn't do this, then we'd | |
2302 | have to handle pending step SIGTRAPs somehow in case the core | |
2303 | later continues the previously-stepped thread, otherwise we'd | |
2304 | report the pending SIGTRAP, and the core, not having stepped the | |
2305 | thread, wouldn't understand what the trap was for, and therefore | |
2306 | would report it to the user as a random signal. */ | |
2307 | if (!non_stop) | |
6bf5e0ba | 2308 | { |
582511be PA |
2309 | event_thread |
2310 | = (struct thread_info *) find_inferior (&all_threads, | |
2311 | select_singlestep_lwp_callback, | |
2312 | NULL); | |
2313 | if (event_thread != NULL) | |
2314 | { | |
2315 | if (debug_threads) | |
2316 | debug_printf ("SEL: Select single-step %s\n", | |
2317 | target_pid_to_str (ptid_of (event_thread))); | |
2318 | } | |
6bf5e0ba | 2319 | } |
582511be | 2320 | if (event_thread == NULL) |
6bf5e0ba PA |
2321 | { |
2322 | /* No single-stepping LWP. Select one at random, out of those | |
b90fc188 | 2323 | which have had events. */ |
6bf5e0ba | 2324 | |
b90fc188 | 2325 | /* First see how many events we have. */ |
d86d4aaf | 2326 | find_inferior (&all_threads, count_events_callback, &num_events); |
8bf3b159 | 2327 | gdb_assert (num_events > 0); |
6bf5e0ba | 2328 | |
b90fc188 PA |
2329 | /* Now randomly pick a LWP out of those that have had |
2330 | events. */ | |
6bf5e0ba PA |
2331 | random_selector = (int) |
2332 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2333 | ||
2334 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2335 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2336 | num_events, random_selector); | |
6bf5e0ba | 2337 | |
d86d4aaf DE |
2338 | event_thread |
2339 | = (struct thread_info *) find_inferior (&all_threads, | |
2340 | select_event_lwp_callback, | |
2341 | &random_selector); | |
6bf5e0ba PA |
2342 | } |
2343 | ||
d86d4aaf | 2344 | if (event_thread != NULL) |
6bf5e0ba | 2345 | { |
d86d4aaf DE |
2346 | struct lwp_info *event_lp = get_thread_lwp (event_thread); |
2347 | ||
6bf5e0ba PA |
2348 | /* Switch the event LWP. */ |
2349 | *orig_lp = event_lp; | |
2350 | } | |
2351 | } | |
2352 | ||
7984d532 PA |
2353 | /* Decrement the suspend count of an LWP. */ |
2354 | ||
2355 | static int | |
2356 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2357 | { | |
d86d4aaf DE |
2358 | struct thread_info *thread = (struct thread_info *) entry; |
2359 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
2360 | |
2361 | /* Ignore EXCEPT. */ | |
2362 | if (lwp == except) | |
2363 | return 0; | |
2364 | ||
2365 | lwp->suspended--; | |
2366 | ||
2367 | gdb_assert (lwp->suspended >= 0); | |
2368 | return 0; | |
2369 | } | |
2370 | ||
2371 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2372 | NULL. */ | |
2373 | ||
2374 | static void | |
2375 | unsuspend_all_lwps (struct lwp_info *except) | |
2376 | { | |
d86d4aaf | 2377 | find_inferior (&all_threads, unsuspend_one_lwp, except); |
7984d532 PA |
2378 | } |
2379 | ||
fa593d66 PA |
2380 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2381 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2382 | void *data); | |
2383 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2384 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2385 | struct target_waitstatus *ourstatus, | |
2386 | int target_options); | |
2387 | ||
2388 | /* Stabilize threads (move out of jump pads). | |
2389 | ||
2390 | If a thread is midway collecting a fast tracepoint, we need to | |
2391 | finish the collection and move it out of the jump pad before | |
2392 | reporting the signal. | |
2393 | ||
2394 | This avoids recursion while collecting (when a signal arrives | |
2395 | midway, and the signal handler itself collects), which would trash | |
2396 | the trace buffer. In case the user set a breakpoint in a signal | |
2397 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2398 | Most importantly, there are certain things we can't do safely if | |
2399 | threads are stopped in a jump pad (or in its callee's). For | |
2400 | example: | |
2401 | ||
2402 | - starting a new trace run. A thread still collecting the | |
2403 | previous run, could trash the trace buffer when resumed. The trace | |
2404 | buffer control structures would have been reset but the thread had | |
2405 | no way to tell. The thread could even midway memcpy'ing to the | |
2406 | buffer, which would mean that when resumed, it would clobber the | |
2407 | trace buffer that had been set for a new run. | |
2408 | ||
2409 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2410 | safely. Say you do tstart while a thread is stopped midway while | |
2411 | collecting. When the thread is later resumed, it finishes the | |
2412 | collection, and returns to the jump pad, to execute the original | |
2413 | instruction that was under the tracepoint jump at the time the | |
2414 | older run had been started. If the jump pad had been rewritten | |
2415 | since for something else in the new run, the thread would now | |
2416 | execute the wrong / random instructions. */ | |
2417 | ||
2418 | static void | |
2419 | linux_stabilize_threads (void) | |
2420 | { | |
0bfdf32f | 2421 | struct thread_info *saved_thread; |
d86d4aaf | 2422 | struct thread_info *thread_stuck; |
fa593d66 | 2423 | |
d86d4aaf DE |
2424 | thread_stuck |
2425 | = (struct thread_info *) find_inferior (&all_threads, | |
2426 | stuck_in_jump_pad_callback, | |
2427 | NULL); | |
2428 | if (thread_stuck != NULL) | |
fa593d66 | 2429 | { |
b4d51a55 | 2430 | if (debug_threads) |
87ce2a04 | 2431 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
d86d4aaf | 2432 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2433 | return; |
2434 | } | |
2435 | ||
0bfdf32f | 2436 | saved_thread = current_thread; |
fa593d66 PA |
2437 | |
2438 | stabilizing_threads = 1; | |
2439 | ||
2440 | /* Kick 'em all. */ | |
d86d4aaf | 2441 | for_each_inferior (&all_threads, move_out_of_jump_pad_callback); |
fa593d66 PA |
2442 | |
2443 | /* Loop until all are stopped out of the jump pads. */ | |
d86d4aaf | 2444 | while (find_inferior (&all_threads, lwp_running, NULL) != NULL) |
fa593d66 PA |
2445 | { |
2446 | struct target_waitstatus ourstatus; | |
2447 | struct lwp_info *lwp; | |
fa593d66 PA |
2448 | int wstat; |
2449 | ||
2450 | /* Note that we go through the full wait even loop. While | |
2451 | moving threads out of jump pad, we need to be able to step | |
2452 | over internal breakpoints and such. */ | |
32fcada3 | 2453 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2454 | |
2455 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2456 | { | |
0bfdf32f | 2457 | lwp = get_thread_lwp (current_thread); |
fa593d66 PA |
2458 | |
2459 | /* Lock it. */ | |
2460 | lwp->suspended++; | |
2461 | ||
a493e3e2 | 2462 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
0bfdf32f | 2463 | || current_thread->last_resume_kind == resume_stop) |
fa593d66 | 2464 | { |
2ea28649 | 2465 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2466 | enqueue_one_deferred_signal (lwp, &wstat); |
2467 | } | |
2468 | } | |
2469 | } | |
2470 | ||
d86d4aaf | 2471 | find_inferior (&all_threads, unsuspend_one_lwp, NULL); |
fa593d66 PA |
2472 | |
2473 | stabilizing_threads = 0; | |
2474 | ||
0bfdf32f | 2475 | current_thread = saved_thread; |
fa593d66 | 2476 | |
b4d51a55 | 2477 | if (debug_threads) |
fa593d66 | 2478 | { |
d86d4aaf DE |
2479 | thread_stuck |
2480 | = (struct thread_info *) find_inferior (&all_threads, | |
2481 | stuck_in_jump_pad_callback, | |
2482 | NULL); | |
2483 | if (thread_stuck != NULL) | |
87ce2a04 | 2484 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
d86d4aaf | 2485 | lwpid_of (thread_stuck)); |
fa593d66 PA |
2486 | } |
2487 | } | |
2488 | ||
582511be PA |
2489 | static void async_file_mark (void); |
2490 | ||
2491 | /* Convenience function that is called when the kernel reports an | |
2492 | event that is not passed out to GDB. */ | |
2493 | ||
2494 | static ptid_t | |
2495 | ignore_event (struct target_waitstatus *ourstatus) | |
2496 | { | |
2497 | /* If we got an event, there may still be others, as a single | |
2498 | SIGCHLD can indicate more than one child stopped. This forces | |
2499 | another target_wait call. */ | |
2500 | async_file_mark (); | |
2501 | ||
2502 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2503 | return null_ptid; | |
2504 | } | |
2505 | ||
0d62e5e8 | 2506 | /* Wait for process, returns status. */ |
da6d8c04 | 2507 | |
95954743 PA |
2508 | static ptid_t |
2509 | linux_wait_1 (ptid_t ptid, | |
2510 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2511 | { |
e5f1222d | 2512 | int w; |
fc7238bb | 2513 | struct lwp_info *event_child; |
bd99dc85 | 2514 | int options; |
bd99dc85 | 2515 | int pid; |
6bf5e0ba PA |
2516 | int step_over_finished; |
2517 | int bp_explains_trap; | |
2518 | int maybe_internal_trap; | |
2519 | int report_to_gdb; | |
219f2f23 | 2520 | int trace_event; |
c2d6af84 | 2521 | int in_step_range; |
bd99dc85 | 2522 | |
87ce2a04 DE |
2523 | if (debug_threads) |
2524 | { | |
2525 | debug_enter (); | |
2526 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2527 | } | |
2528 | ||
bd99dc85 PA |
2529 | /* Translate generic target options into linux options. */ |
2530 | options = __WALL; | |
2531 | if (target_options & TARGET_WNOHANG) | |
2532 | options |= WNOHANG; | |
0d62e5e8 | 2533 | |
fa593d66 PA |
2534 | bp_explains_trap = 0; |
2535 | trace_event = 0; | |
c2d6af84 | 2536 | in_step_range = 0; |
bd99dc85 PA |
2537 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2538 | ||
6bf5e0ba PA |
2539 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2540 | pid = linux_wait_for_event (ptid, &w, options); | |
2541 | else | |
2542 | { | |
2543 | if (debug_threads) | |
87ce2a04 DE |
2544 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2545 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2546 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2547 | } | |
2548 | ||
fa96cb38 | 2549 | if (pid == 0) |
87ce2a04 | 2550 | { |
fa96cb38 PA |
2551 | gdb_assert (target_options & TARGET_WNOHANG); |
2552 | ||
87ce2a04 DE |
2553 | if (debug_threads) |
2554 | { | |
fa96cb38 PA |
2555 | debug_printf ("linux_wait_1 ret = null_ptid, " |
2556 | "TARGET_WAITKIND_IGNORE\n"); | |
87ce2a04 DE |
2557 | debug_exit (); |
2558 | } | |
fa96cb38 PA |
2559 | |
2560 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
87ce2a04 DE |
2561 | return null_ptid; |
2562 | } | |
fa96cb38 PA |
2563 | else if (pid == -1) |
2564 | { | |
2565 | if (debug_threads) | |
2566 | { | |
2567 | debug_printf ("linux_wait_1 ret = null_ptid, " | |
2568 | "TARGET_WAITKIND_NO_RESUMED\n"); | |
2569 | debug_exit (); | |
2570 | } | |
bd99dc85 | 2571 | |
fa96cb38 PA |
2572 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
2573 | return null_ptid; | |
2574 | } | |
0d62e5e8 | 2575 | |
0bfdf32f | 2576 | event_child = get_thread_lwp (current_thread); |
0d62e5e8 | 2577 | |
fa96cb38 PA |
2578 | /* linux_wait_for_event only returns an exit status for the last |
2579 | child of a process. Report it. */ | |
2580 | if (WIFEXITED (w) || WIFSIGNALED (w)) | |
da6d8c04 | 2581 | { |
fa96cb38 | 2582 | if (WIFEXITED (w)) |
0d62e5e8 | 2583 | { |
fa96cb38 PA |
2584 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
2585 | ourstatus->value.integer = WEXITSTATUS (w); | |
bd99dc85 | 2586 | |
fa96cb38 | 2587 | if (debug_threads) |
bd99dc85 | 2588 | { |
fa96cb38 PA |
2589 | debug_printf ("linux_wait_1 ret = %s, exited with " |
2590 | "retcode %d\n", | |
0bfdf32f | 2591 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2592 | WEXITSTATUS (w)); |
2593 | debug_exit (); | |
bd99dc85 | 2594 | } |
fa96cb38 PA |
2595 | } |
2596 | else | |
2597 | { | |
2598 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2599 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); | |
5b1c542e | 2600 | |
fa96cb38 PA |
2601 | if (debug_threads) |
2602 | { | |
2603 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2604 | "signal %d\n", | |
0bfdf32f | 2605 | target_pid_to_str (ptid_of (current_thread)), |
fa96cb38 PA |
2606 | WTERMSIG (w)); |
2607 | debug_exit (); | |
2608 | } | |
0d62e5e8 | 2609 | } |
fa96cb38 | 2610 | |
0bfdf32f | 2611 | return ptid_of (current_thread); |
da6d8c04 DJ |
2612 | } |
2613 | ||
8090aef2 PA |
2614 | /* If step-over executes a breakpoint instruction, it means a |
2615 | gdb/gdbserver breakpoint had been planted on top of a permanent | |
2616 | breakpoint. The PC has been adjusted by | |
2617 | check_stopped_by_breakpoint to point at the breakpoint address. | |
2618 | Advance the PC manually past the breakpoint, otherwise the | |
2619 | program would keep trapping the permanent breakpoint forever. */ | |
2620 | if (!ptid_equal (step_over_bkpt, null_ptid) | |
15c66dd6 | 2621 | && event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT) |
8090aef2 | 2622 | { |
9beb7c4e | 2623 | unsigned int increment_pc = the_low_target.breakpoint_len; |
8090aef2 PA |
2624 | |
2625 | if (debug_threads) | |
2626 | { | |
2627 | debug_printf ("step-over for %s executed software breakpoint\n", | |
2628 | target_pid_to_str (ptid_of (current_thread))); | |
2629 | } | |
2630 | ||
2631 | if (increment_pc != 0) | |
2632 | { | |
2633 | struct regcache *regcache | |
2634 | = get_thread_regcache (current_thread, 1); | |
2635 | ||
2636 | event_child->stop_pc += increment_pc; | |
2637 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2638 | ||
2639 | if (!(*the_low_target.breakpoint_at) (event_child->stop_pc)) | |
15c66dd6 | 2640 | event_child->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
8090aef2 PA |
2641 | } |
2642 | } | |
2643 | ||
6bf5e0ba PA |
2644 | /* If this event was not handled before, and is not a SIGTRAP, we |
2645 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2646 | a breakpoint is inserted at the current PC. If this target does | |
2647 | not support internal breakpoints at all, we also report the | |
2648 | SIGTRAP without further processing; it's of no concern to us. */ | |
2649 | maybe_internal_trap | |
2650 | = (supports_breakpoints () | |
2651 | && (WSTOPSIG (w) == SIGTRAP | |
2652 | || ((WSTOPSIG (w) == SIGILL | |
2653 | || WSTOPSIG (w) == SIGSEGV) | |
2654 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2655 | ||
2656 | if (maybe_internal_trap) | |
2657 | { | |
2658 | /* Handle anything that requires bookkeeping before deciding to | |
2659 | report the event or continue waiting. */ | |
2660 | ||
2661 | /* First check if we can explain the SIGTRAP with an internal | |
2662 | breakpoint, or if we should possibly report the event to GDB. | |
2663 | Do this before anything that may remove or insert a | |
2664 | breakpoint. */ | |
2665 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2666 | ||
2667 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2668 | finished. If so, tweak the state machine accordingly, | |
2669 | reinsert breakpoints and delete any reinsert (software | |
2670 | single-step) breakpoints. */ | |
2671 | step_over_finished = finish_step_over (event_child); | |
2672 | ||
2673 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2674 | check_breakpoints (event_child->stop_pc); | |
2675 | ||
219f2f23 PA |
2676 | /* Handle tracepoint data collecting. This may overflow the |
2677 | trace buffer, and cause a tracing stop, removing | |
2678 | breakpoints. */ | |
2679 | trace_event = handle_tracepoints (event_child); | |
2680 | ||
6bf5e0ba PA |
2681 | if (bp_explains_trap) |
2682 | { | |
2683 | /* If we stepped or ran into an internal breakpoint, we've | |
2684 | already handled it. So next time we resume (from this | |
2685 | PC), we should step over it. */ | |
2686 | if (debug_threads) | |
87ce2a04 | 2687 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2688 | |
8b07ae33 PA |
2689 | if (breakpoint_here (event_child->stop_pc)) |
2690 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2691 | } |
2692 | } | |
2693 | else | |
2694 | { | |
2695 | /* We have some other signal, possibly a step-over dance was in | |
2696 | progress, and it should be cancelled too. */ | |
2697 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2698 | } |
2699 | ||
2700 | /* We have all the data we need. Either report the event to GDB, or | |
2701 | resume threads and keep waiting for more. */ | |
2702 | ||
2703 | /* If we're collecting a fast tracepoint, finish the collection and | |
2704 | move out of the jump pad before delivering a signal. See | |
2705 | linux_stabilize_threads. */ | |
2706 | ||
2707 | if (WIFSTOPPED (w) | |
2708 | && WSTOPSIG (w) != SIGTRAP | |
2709 | && supports_fast_tracepoints () | |
58b4daa5 | 2710 | && agent_loaded_p ()) |
fa593d66 PA |
2711 | { |
2712 | if (debug_threads) | |
87ce2a04 DE |
2713 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2714 | "to defer or adjust it.\n", | |
0bfdf32f | 2715 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2716 | |
2717 | /* Allow debugging the jump pad itself. */ | |
0bfdf32f | 2718 | if (current_thread->last_resume_kind != resume_step |
fa593d66 PA |
2719 | && maybe_move_out_of_jump_pad (event_child, &w)) |
2720 | { | |
2721 | enqueue_one_deferred_signal (event_child, &w); | |
2722 | ||
2723 | if (debug_threads) | |
87ce2a04 | 2724 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
0bfdf32f | 2725 | WSTOPSIG (w), lwpid_of (current_thread)); |
fa593d66 PA |
2726 | |
2727 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
582511be PA |
2728 | |
2729 | return ignore_event (ourstatus); | |
fa593d66 PA |
2730 | } |
2731 | } | |
219f2f23 | 2732 | |
fa593d66 PA |
2733 | if (event_child->collecting_fast_tracepoint) |
2734 | { | |
2735 | if (debug_threads) | |
87ce2a04 DE |
2736 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2737 | "Check if we're already there.\n", | |
0bfdf32f | 2738 | lwpid_of (current_thread), |
87ce2a04 | 2739 | event_child->collecting_fast_tracepoint); |
fa593d66 PA |
2740 | |
2741 | trace_event = 1; | |
2742 | ||
2743 | event_child->collecting_fast_tracepoint | |
2744 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2745 | ||
2746 | if (event_child->collecting_fast_tracepoint != 1) | |
2747 | { | |
2748 | /* No longer need this breakpoint. */ | |
2749 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2750 | { | |
2751 | if (debug_threads) | |
87ce2a04 DE |
2752 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2753 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2754 | |
2755 | /* Other running threads could hit this breakpoint. | |
2756 | We don't handle moribund locations like GDB does, | |
2757 | instead we always pause all threads when removing | |
2758 | breakpoints, so that any step-over or | |
2759 | decr_pc_after_break adjustment is always taken | |
2760 | care of while the breakpoint is still | |
2761 | inserted. */ | |
2762 | stop_all_lwps (1, event_child); | |
fa593d66 PA |
2763 | |
2764 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2765 | event_child->exit_jump_pad_bkpt = NULL; | |
2766 | ||
2767 | unstop_all_lwps (1, event_child); | |
2768 | ||
2769 | gdb_assert (event_child->suspended >= 0); | |
2770 | } | |
2771 | } | |
2772 | ||
2773 | if (event_child->collecting_fast_tracepoint == 0) | |
2774 | { | |
2775 | if (debug_threads) | |
87ce2a04 DE |
2776 | debug_printf ("fast tracepoint finished " |
2777 | "collecting successfully.\n"); | |
fa593d66 PA |
2778 | |
2779 | /* We may have a deferred signal to report. */ | |
2780 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2781 | { | |
2782 | if (debug_threads) | |
87ce2a04 | 2783 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2784 | } |
3c11dd79 | 2785 | else |
fa593d66 | 2786 | { |
3c11dd79 | 2787 | if (debug_threads) |
87ce2a04 | 2788 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2789 | |
2790 | if (stabilizing_threads) | |
2791 | { | |
2792 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2793 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2794 | |
2795 | if (debug_threads) | |
2796 | { | |
2797 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2798 | "while stabilizing threads\n", | |
0bfdf32f | 2799 | target_pid_to_str (ptid_of (current_thread))); |
87ce2a04 DE |
2800 | debug_exit (); |
2801 | } | |
2802 | ||
0bfdf32f | 2803 | return ptid_of (current_thread); |
fa593d66 PA |
2804 | } |
2805 | } | |
2806 | } | |
6bf5e0ba PA |
2807 | } |
2808 | ||
e471f25b PA |
2809 | /* Check whether GDB would be interested in this event. */ |
2810 | ||
2811 | /* If GDB is not interested in this signal, don't stop other | |
2812 | threads, and don't report it to GDB. Just resume the inferior | |
2813 | right away. We do this for threading-related signals as well as | |
2814 | any that GDB specifically requested we ignore. But never ignore | |
2815 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2816 | stepping - they may require special handling to skip the signal | |
c9587f88 AT |
2817 | handler. Also never ignore signals that could be caused by a |
2818 | breakpoint. */ | |
e471f25b PA |
2819 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's |
2820 | thread library? */ | |
2821 | if (WIFSTOPPED (w) | |
0bfdf32f | 2822 | && current_thread->last_resume_kind != resume_step |
e471f25b | 2823 | && ( |
1a981360 | 2824 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
fe978cb0 | 2825 | (current_process ()->priv->thread_db != NULL |
e471f25b PA |
2826 | && (WSTOPSIG (w) == __SIGRTMIN |
2827 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2828 | || | |
2829 | #endif | |
2ea28649 | 2830 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b | 2831 | && !(WSTOPSIG (w) == SIGSTOP |
c9587f88 AT |
2832 | && current_thread->last_resume_kind == resume_stop) |
2833 | && !linux_wstatus_maybe_breakpoint (w)))) | |
e471f25b PA |
2834 | { |
2835 | siginfo_t info, *info_p; | |
2836 | ||
2837 | if (debug_threads) | |
87ce2a04 | 2838 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
0bfdf32f | 2839 | WSTOPSIG (w), lwpid_of (current_thread)); |
e471f25b | 2840 | |
0bfdf32f | 2841 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (current_thread), |
b8e1b30e | 2842 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2843 | info_p = &info; |
2844 | else | |
2845 | info_p = NULL; | |
2846 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2847 | WSTOPSIG (w), info_p); | |
582511be | 2848 | return ignore_event (ourstatus); |
e471f25b PA |
2849 | } |
2850 | ||
c2d6af84 PA |
2851 | /* Note that all addresses are always "out of the step range" when |
2852 | there's no range to begin with. */ | |
2853 | in_step_range = lwp_in_step_range (event_child); | |
2854 | ||
2855 | /* If GDB wanted this thread to single step, and the thread is out | |
2856 | of the step range, we always want to report the SIGTRAP, and let | |
2857 | GDB handle it. Watchpoints should always be reported. So should | |
2858 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2859 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2860 | do, we're be able to handle GDB breakpoints on top of internal | |
2861 | breakpoints, by handling the internal breakpoint and still | |
2862 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2863 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2864 | report_to_gdb = (!maybe_internal_trap |
0bfdf32f | 2865 | || (current_thread->last_resume_kind == resume_step |
c2d6af84 | 2866 | && !in_step_range) |
15c66dd6 | 2867 | || event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
c2d6af84 | 2868 | || (!step_over_finished && !in_step_range |
493e2a69 | 2869 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2870 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2871 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2872 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2873 | ||
2874 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2875 | |
2876 | /* We found no reason GDB would want us to stop. We either hit one | |
2877 | of our own breakpoints, or finished an internal step GDB | |
2878 | shouldn't know about. */ | |
2879 | if (!report_to_gdb) | |
2880 | { | |
2881 | if (debug_threads) | |
2882 | { | |
2883 | if (bp_explains_trap) | |
87ce2a04 | 2884 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2885 | if (step_over_finished) |
87ce2a04 | 2886 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2887 | if (trace_event) |
87ce2a04 | 2888 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2889 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2890 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2891 | paddress (event_child->stop_pc), | |
2892 | paddress (event_child->step_range_start), | |
2893 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2894 | } |
2895 | ||
2896 | /* We're not reporting this breakpoint to GDB, so apply the | |
2897 | decr_pc_after_break adjustment to the inferior's regcache | |
2898 | ourselves. */ | |
2899 | ||
2900 | if (the_low_target.set_pc != NULL) | |
2901 | { | |
2902 | struct regcache *regcache | |
0bfdf32f | 2903 | = get_thread_regcache (current_thread, 1); |
6bf5e0ba PA |
2904 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); |
2905 | } | |
2906 | ||
7984d532 PA |
2907 | /* We may have finished stepping over a breakpoint. If so, |
2908 | we've stopped and suspended all LWPs momentarily except the | |
2909 | stepping one. This is where we resume them all again. We're | |
2910 | going to keep waiting, so use proceed, which handles stepping | |
2911 | over the next breakpoint. */ | |
6bf5e0ba | 2912 | if (debug_threads) |
87ce2a04 | 2913 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2914 | |
2915 | if (step_over_finished) | |
2916 | unsuspend_all_lwps (event_child); | |
2917 | ||
6bf5e0ba | 2918 | proceed_all_lwps (); |
582511be | 2919 | return ignore_event (ourstatus); |
6bf5e0ba PA |
2920 | } |
2921 | ||
2922 | if (debug_threads) | |
2923 | { | |
0bfdf32f | 2924 | if (current_thread->last_resume_kind == resume_step) |
c2d6af84 PA |
2925 | { |
2926 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2927 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2928 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2929 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2930 | } |
15c66dd6 | 2931 | if (event_child->stop_reason == TARGET_STOPPED_BY_WATCHPOINT) |
87ce2a04 | 2932 | debug_printf ("Stopped by watchpoint.\n"); |
582511be | 2933 | else if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2934 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2935 | if (debug_threads) |
87ce2a04 | 2936 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2937 | } |
2938 | ||
2939 | /* Alright, we're going to report a stop. */ | |
2940 | ||
582511be | 2941 | if (!stabilizing_threads) |
6bf5e0ba PA |
2942 | { |
2943 | /* In all-stop, stop all threads. */ | |
582511be PA |
2944 | if (!non_stop) |
2945 | stop_all_lwps (0, NULL); | |
6bf5e0ba PA |
2946 | |
2947 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2948 | from among those that have had events. Giving equal priority | |
2949 | to all LWPs that have had events helps prevent | |
2950 | starvation. */ | |
2951 | if (ptid_equal (ptid, minus_one_ptid)) | |
2952 | { | |
2953 | event_child->status_pending_p = 1; | |
2954 | event_child->status_pending = w; | |
2955 | ||
2956 | select_event_lwp (&event_child); | |
2957 | ||
0bfdf32f GB |
2958 | /* current_thread and event_child must stay in sync. */ |
2959 | current_thread = get_lwp_thread (event_child); | |
ee1e2d4f | 2960 | |
6bf5e0ba PA |
2961 | event_child->status_pending_p = 0; |
2962 | w = event_child->status_pending; | |
2963 | } | |
2964 | ||
c03e6ccc | 2965 | if (step_over_finished) |
582511be PA |
2966 | { |
2967 | if (!non_stop) | |
2968 | { | |
2969 | /* If we were doing a step-over, all other threads but | |
2970 | the stepping one had been paused in start_step_over, | |
2971 | with their suspend counts incremented. We don't want | |
2972 | to do a full unstop/unpause, because we're in | |
2973 | all-stop mode (so we want threads stopped), but we | |
2974 | still need to unsuspend the other threads, to | |
2975 | decrement their `suspended' count back. */ | |
2976 | unsuspend_all_lwps (event_child); | |
2977 | } | |
2978 | else | |
2979 | { | |
2980 | /* If we just finished a step-over, then all threads had | |
2981 | been momentarily paused. In all-stop, that's fine, | |
2982 | we want threads stopped by now anyway. In non-stop, | |
2983 | we need to re-resume threads that GDB wanted to be | |
2984 | running. */ | |
2985 | unstop_all_lwps (1, event_child); | |
2986 | } | |
2987 | } | |
c03e6ccc | 2988 | |
fa593d66 | 2989 | /* Stabilize threads (move out of jump pads). */ |
582511be PA |
2990 | if (!non_stop) |
2991 | stabilize_threads (); | |
6bf5e0ba PA |
2992 | } |
2993 | else | |
2994 | { | |
2995 | /* If we just finished a step-over, then all threads had been | |
2996 | momentarily paused. In all-stop, that's fine, we want | |
2997 | threads stopped by now anyway. In non-stop, we need to | |
2998 | re-resume threads that GDB wanted to be running. */ | |
2999 | if (step_over_finished) | |
7984d532 | 3000 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
3001 | } |
3002 | ||
5b1c542e | 3003 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 3004 | |
582511be | 3005 | /* Now that we've selected our final event LWP, un-adjust its PC if |
3e572f71 PA |
3006 | it was a software breakpoint, and the client doesn't know we can |
3007 | adjust the breakpoint ourselves. */ | |
3008 | if (event_child->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3009 | && !swbreak_feature) | |
582511be PA |
3010 | { |
3011 | int decr_pc = the_low_target.decr_pc_after_break; | |
3012 | ||
3013 | if (decr_pc != 0) | |
3014 | { | |
3015 | struct regcache *regcache | |
3016 | = get_thread_regcache (current_thread, 1); | |
3017 | (*the_low_target.set_pc) (regcache, event_child->stop_pc + decr_pc); | |
3018 | } | |
3019 | } | |
3020 | ||
0bfdf32f | 3021 | if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3022 | && WSTOPSIG (w) == SIGSTOP) |
bd99dc85 PA |
3023 | { |
3024 | /* A thread that has been requested to stop by GDB with vCont;t, | |
3025 | and it stopped cleanly, so report as SIG0. The use of | |
3026 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 3027 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 3028 | } |
0bfdf32f | 3029 | else if (current_thread->last_resume_kind == resume_stop |
8336d594 | 3030 | && WSTOPSIG (w) != SIGSTOP) |
bd99dc85 PA |
3031 | { |
3032 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 3033 | but, it stopped for other reasons. */ |
2ea28649 | 3034 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3035 | } |
3036 | else | |
3037 | { | |
2ea28649 | 3038 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
3039 | } |
3040 | ||
d50171e4 PA |
3041 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
3042 | ||
bd99dc85 | 3043 | if (debug_threads) |
87ce2a04 DE |
3044 | { |
3045 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
0bfdf32f | 3046 | target_pid_to_str (ptid_of (current_thread)), |
87ce2a04 DE |
3047 | ourstatus->kind, ourstatus->value.sig); |
3048 | debug_exit (); | |
3049 | } | |
bd99dc85 | 3050 | |
0bfdf32f | 3051 | return ptid_of (current_thread); |
bd99dc85 PA |
3052 | } |
3053 | ||
3054 | /* Get rid of any pending event in the pipe. */ | |
3055 | static void | |
3056 | async_file_flush (void) | |
3057 | { | |
3058 | int ret; | |
3059 | char buf; | |
3060 | ||
3061 | do | |
3062 | ret = read (linux_event_pipe[0], &buf, 1); | |
3063 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
3064 | } | |
3065 | ||
3066 | /* Put something in the pipe, so the event loop wakes up. */ | |
3067 | static void | |
3068 | async_file_mark (void) | |
3069 | { | |
3070 | int ret; | |
3071 | ||
3072 | async_file_flush (); | |
3073 | ||
3074 | do | |
3075 | ret = write (linux_event_pipe[1], "+", 1); | |
3076 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
3077 | ||
3078 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
3079 | be awakened anyway. */ | |
3080 | } | |
3081 | ||
95954743 PA |
3082 | static ptid_t |
3083 | linux_wait (ptid_t ptid, | |
3084 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 3085 | { |
95954743 | 3086 | ptid_t event_ptid; |
bd99dc85 | 3087 | |
bd99dc85 PA |
3088 | /* Flush the async file first. */ |
3089 | if (target_is_async_p ()) | |
3090 | async_file_flush (); | |
3091 | ||
582511be PA |
3092 | do |
3093 | { | |
3094 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); | |
3095 | } | |
3096 | while ((target_options & TARGET_WNOHANG) == 0 | |
3097 | && ptid_equal (event_ptid, null_ptid) | |
3098 | && ourstatus->kind == TARGET_WAITKIND_IGNORE); | |
bd99dc85 PA |
3099 | |
3100 | /* If at least one stop was reported, there may be more. A single | |
3101 | SIGCHLD can signal more than one child stop. */ | |
3102 | if (target_is_async_p () | |
3103 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 3104 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
3105 | async_file_mark (); |
3106 | ||
3107 | return event_ptid; | |
da6d8c04 DJ |
3108 | } |
3109 | ||
c5f62d5f | 3110 | /* Send a signal to an LWP. */ |
fd500816 DJ |
3111 | |
3112 | static int | |
a1928bad | 3113 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 3114 | { |
c5f62d5f DE |
3115 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
3116 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 3117 | |
c5f62d5f DE |
3118 | #ifdef __NR_tkill |
3119 | { | |
3120 | static int tkill_failed; | |
fd500816 | 3121 | |
c5f62d5f DE |
3122 | if (!tkill_failed) |
3123 | { | |
3124 | int ret; | |
3125 | ||
3126 | errno = 0; | |
3127 | ret = syscall (__NR_tkill, lwpid, signo); | |
3128 | if (errno != ENOSYS) | |
3129 | return ret; | |
3130 | tkill_failed = 1; | |
3131 | } | |
3132 | } | |
fd500816 DJ |
3133 | #endif |
3134 | ||
3135 | return kill (lwpid, signo); | |
3136 | } | |
3137 | ||
964e4306 PA |
3138 | void |
3139 | linux_stop_lwp (struct lwp_info *lwp) | |
3140 | { | |
3141 | send_sigstop (lwp); | |
3142 | } | |
3143 | ||
0d62e5e8 | 3144 | static void |
02fc4de7 | 3145 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 3146 | { |
bd99dc85 | 3147 | int pid; |
0d62e5e8 | 3148 | |
d86d4aaf | 3149 | pid = lwpid_of (get_lwp_thread (lwp)); |
bd99dc85 | 3150 | |
0d62e5e8 DJ |
3151 | /* If we already have a pending stop signal for this process, don't |
3152 | send another. */ | |
54a0b537 | 3153 | if (lwp->stop_expected) |
0d62e5e8 | 3154 | { |
ae13219e | 3155 | if (debug_threads) |
87ce2a04 | 3156 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 3157 | |
0d62e5e8 DJ |
3158 | return; |
3159 | } | |
3160 | ||
3161 | if (debug_threads) | |
87ce2a04 | 3162 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 3163 | |
d50171e4 | 3164 | lwp->stop_expected = 1; |
bd99dc85 | 3165 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
3166 | } |
3167 | ||
7984d532 PA |
3168 | static int |
3169 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 | 3170 | { |
d86d4aaf DE |
3171 | struct thread_info *thread = (struct thread_info *) entry; |
3172 | struct lwp_info *lwp = get_thread_lwp (thread); | |
02fc4de7 | 3173 | |
7984d532 PA |
3174 | /* Ignore EXCEPT. */ |
3175 | if (lwp == except) | |
3176 | return 0; | |
3177 | ||
02fc4de7 | 3178 | if (lwp->stopped) |
7984d532 | 3179 | return 0; |
02fc4de7 PA |
3180 | |
3181 | send_sigstop (lwp); | |
7984d532 PA |
3182 | return 0; |
3183 | } | |
3184 | ||
3185 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
3186 | yet. */ | |
3187 | static int | |
3188 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
3189 | void *except) | |
3190 | { | |
d86d4aaf DE |
3191 | struct thread_info *thread = (struct thread_info *) entry; |
3192 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
3193 | |
3194 | /* Ignore EXCEPT. */ | |
3195 | if (lwp == except) | |
3196 | return 0; | |
3197 | ||
3198 | lwp->suspended++; | |
3199 | ||
3200 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
3201 | } |
3202 | ||
95954743 PA |
3203 | static void |
3204 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
3205 | { | |
3206 | /* It's dead, really. */ | |
3207 | lwp->dead = 1; | |
3208 | ||
3209 | /* Store the exit status for later. */ | |
3210 | lwp->status_pending_p = 1; | |
3211 | lwp->status_pending = wstat; | |
3212 | ||
95954743 PA |
3213 | /* Prevent trying to stop it. */ |
3214 | lwp->stopped = 1; | |
3215 | ||
3216 | /* No further stops are expected from a dead lwp. */ | |
3217 | lwp->stop_expected = 0; | |
3218 | } | |
3219 | ||
fa96cb38 PA |
3220 | /* Wait for all children to stop for the SIGSTOPs we just queued. */ |
3221 | ||
0d62e5e8 | 3222 | static void |
fa96cb38 | 3223 | wait_for_sigstop (void) |
0d62e5e8 | 3224 | { |
0bfdf32f | 3225 | struct thread_info *saved_thread; |
95954743 | 3226 | ptid_t saved_tid; |
fa96cb38 PA |
3227 | int wstat; |
3228 | int ret; | |
0d62e5e8 | 3229 | |
0bfdf32f GB |
3230 | saved_thread = current_thread; |
3231 | if (saved_thread != NULL) | |
3232 | saved_tid = saved_thread->entry.id; | |
bd99dc85 | 3233 | else |
95954743 | 3234 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 3235 | |
d50171e4 | 3236 | if (debug_threads) |
fa96cb38 | 3237 | debug_printf ("wait_for_sigstop: pulling events\n"); |
d50171e4 | 3238 | |
fa96cb38 PA |
3239 | /* Passing NULL_PTID as filter indicates we want all events to be |
3240 | left pending. Eventually this returns when there are no | |
3241 | unwaited-for children left. */ | |
3242 | ret = linux_wait_for_event_filtered (minus_one_ptid, null_ptid, | |
3243 | &wstat, __WALL); | |
3244 | gdb_assert (ret == -1); | |
0d62e5e8 | 3245 | |
0bfdf32f GB |
3246 | if (saved_thread == NULL || linux_thread_alive (saved_tid)) |
3247 | current_thread = saved_thread; | |
0d62e5e8 DJ |
3248 | else |
3249 | { | |
3250 | if (debug_threads) | |
87ce2a04 | 3251 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 3252 | |
bd99dc85 PA |
3253 | if (non_stop) |
3254 | { | |
3255 | /* We can't change the current inferior behind GDB's back, | |
3256 | otherwise, a subsequent command may apply to the wrong | |
3257 | process. */ | |
0bfdf32f | 3258 | current_thread = NULL; |
bd99dc85 PA |
3259 | } |
3260 | else | |
3261 | { | |
3262 | /* Set a valid thread as current. */ | |
0bfdf32f | 3263 | set_desired_thread (0); |
bd99dc85 | 3264 | } |
0d62e5e8 DJ |
3265 | } |
3266 | } | |
3267 | ||
fa593d66 PA |
3268 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3269 | move it out, because we need to report the stop event to GDB. For | |
3270 | example, if the user puts a breakpoint in the jump pad, it's | |
3271 | because she wants to debug it. */ | |
3272 | ||
3273 | static int | |
3274 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3275 | { | |
d86d4aaf DE |
3276 | struct thread_info *thread = (struct thread_info *) entry; |
3277 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3278 | |
3279 | gdb_assert (lwp->suspended == 0); | |
3280 | gdb_assert (lwp->stopped); | |
3281 | ||
3282 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3283 | return (supports_fast_tracepoints () | |
58b4daa5 | 3284 | && agent_loaded_p () |
fa593d66 | 3285 | && (gdb_breakpoint_here (lwp->stop_pc) |
15c66dd6 | 3286 | || lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3287 | || thread->last_resume_kind == resume_step) |
3288 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3289 | } | |
3290 | ||
3291 | static void | |
3292 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3293 | { | |
d86d4aaf DE |
3294 | struct thread_info *thread = (struct thread_info *) entry; |
3295 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3296 | int *wstat; |
3297 | ||
3298 | gdb_assert (lwp->suspended == 0); | |
3299 | gdb_assert (lwp->stopped); | |
3300 | ||
3301 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3302 | ||
3303 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3304 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
15c66dd6 | 3305 | && lwp->stop_reason != TARGET_STOPPED_BY_WATCHPOINT |
fa593d66 PA |
3306 | && thread->last_resume_kind != resume_step |
3307 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3308 | { | |
3309 | if (debug_threads) | |
87ce2a04 | 3310 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
d86d4aaf | 3311 | lwpid_of (thread)); |
fa593d66 PA |
3312 | |
3313 | if (wstat) | |
3314 | { | |
3315 | lwp->status_pending_p = 0; | |
3316 | enqueue_one_deferred_signal (lwp, wstat); | |
3317 | ||
3318 | if (debug_threads) | |
87ce2a04 DE |
3319 | debug_printf ("Signal %d for LWP %ld deferred " |
3320 | "(in jump pad)\n", | |
d86d4aaf | 3321 | WSTOPSIG (*wstat), lwpid_of (thread)); |
fa593d66 PA |
3322 | } |
3323 | ||
3324 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3325 | } | |
3326 | else | |
3327 | lwp->suspended++; | |
3328 | } | |
3329 | ||
3330 | static int | |
3331 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3332 | { | |
d86d4aaf DE |
3333 | struct thread_info *thread = (struct thread_info *) entry; |
3334 | struct lwp_info *lwp = get_thread_lwp (thread); | |
fa593d66 PA |
3335 | |
3336 | if (lwp->dead) | |
3337 | return 0; | |
3338 | if (lwp->stopped) | |
3339 | return 0; | |
3340 | return 1; | |
3341 | } | |
3342 | ||
7984d532 PA |
3343 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3344 | If SUSPEND, then also increase the suspend count of every LWP, | |
3345 | except EXCEPT. */ | |
3346 | ||
0d62e5e8 | 3347 | static void |
7984d532 | 3348 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3349 | { |
bde24c0a PA |
3350 | /* Should not be called recursively. */ |
3351 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3352 | ||
87ce2a04 DE |
3353 | if (debug_threads) |
3354 | { | |
3355 | debug_enter (); | |
3356 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3357 | suspend ? "stop-and-suspend" : "stop", | |
3358 | except != NULL | |
d86d4aaf | 3359 | ? target_pid_to_str (ptid_of (get_lwp_thread (except))) |
87ce2a04 DE |
3360 | : "none"); |
3361 | } | |
3362 | ||
bde24c0a PA |
3363 | stopping_threads = (suspend |
3364 | ? STOPPING_AND_SUSPENDING_THREADS | |
3365 | : STOPPING_THREADS); | |
7984d532 PA |
3366 | |
3367 | if (suspend) | |
d86d4aaf | 3368 | find_inferior (&all_threads, suspend_and_send_sigstop_callback, except); |
7984d532 | 3369 | else |
d86d4aaf | 3370 | find_inferior (&all_threads, send_sigstop_callback, except); |
fa96cb38 | 3371 | wait_for_sigstop (); |
bde24c0a | 3372 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3373 | |
3374 | if (debug_threads) | |
3375 | { | |
3376 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3377 | "back to !stopping\n"); | |
3378 | debug_exit (); | |
3379 | } | |
0d62e5e8 DJ |
3380 | } |
3381 | ||
23f238d3 PA |
3382 | /* Resume execution of LWP. If STEP is nonzero, single-step it. If |
3383 | SIGNAL is nonzero, give it that signal. */ | |
da6d8c04 | 3384 | |
ce3a066d | 3385 | static void |
23f238d3 PA |
3386 | linux_resume_one_lwp_throw (struct lwp_info *lwp, |
3387 | int step, int signal, siginfo_t *info) | |
da6d8c04 | 3388 | { |
d86d4aaf | 3389 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3390 | struct thread_info *saved_thread; |
fa593d66 | 3391 | int fast_tp_collecting; |
0d62e5e8 | 3392 | |
54a0b537 | 3393 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3394 | return; |
3395 | ||
fa593d66 PA |
3396 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3397 | ||
3398 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3399 | ||
219f2f23 PA |
3400 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3401 | user used the "jump" command, or "set $pc = foo"). */ | |
3402 | if (lwp->stop_pc != get_pc (lwp)) | |
3403 | { | |
3404 | /* Collecting 'while-stepping' actions doesn't make sense | |
3405 | anymore. */ | |
d86d4aaf | 3406 | release_while_stepping_state_list (thread); |
219f2f23 PA |
3407 | } |
3408 | ||
0d62e5e8 DJ |
3409 | /* If we have pending signals or status, and a new signal, enqueue the |
3410 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3411 | breakpoint; it will be picked up again below. */ | |
3412 | if (signal != 0 | |
fa593d66 PA |
3413 | && (lwp->status_pending_p |
3414 | || lwp->pending_signals != NULL | |
3415 | || lwp->bp_reinsert != 0 | |
3416 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3417 | { |
3418 | struct pending_signals *p_sig; | |
bca929d3 | 3419 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3420 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3421 | p_sig->signal = signal; |
32ca6d61 DJ |
3422 | if (info == NULL) |
3423 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3424 | else | |
3425 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3426 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3427 | } |
3428 | ||
d50171e4 PA |
3429 | if (lwp->status_pending_p) |
3430 | { | |
3431 | if (debug_threads) | |
87ce2a04 DE |
3432 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3433 | " has pending status\n", | |
d86d4aaf | 3434 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3435 | lwp->stop_expected ? "expected" : "not expected"); |
d50171e4 PA |
3436 | return; |
3437 | } | |
0d62e5e8 | 3438 | |
0bfdf32f GB |
3439 | saved_thread = current_thread; |
3440 | current_thread = thread; | |
0d62e5e8 DJ |
3441 | |
3442 | if (debug_threads) | |
87ce2a04 | 3443 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
d86d4aaf | 3444 | lwpid_of (thread), step ? "step" : "continue", signal, |
87ce2a04 | 3445 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3446 | |
3447 | /* This bit needs some thinking about. If we get a signal that | |
3448 | we must report while a single-step reinsert is still pending, | |
3449 | we often end up resuming the thread. It might be better to | |
3450 | (ew) allow a stack of pending events; then we could be sure that | |
3451 | the reinsert happened right away and not lose any signals. | |
3452 | ||
3453 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3454 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3455 | complete correctness, so it won't solve that problem. It may be |
3456 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3457 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3458 | { |
3459 | if (debug_threads) | |
87ce2a04 DE |
3460 | debug_printf (" pending reinsert at 0x%s\n", |
3461 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3462 | |
85e00e85 | 3463 | if (can_hardware_single_step ()) |
d50171e4 | 3464 | { |
fa593d66 PA |
3465 | if (fast_tp_collecting == 0) |
3466 | { | |
3467 | if (step == 0) | |
3468 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3469 | if (lwp->suspended) | |
3470 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3471 | lwp->suspended); | |
3472 | } | |
d50171e4 PA |
3473 | |
3474 | step = 1; | |
3475 | } | |
0d62e5e8 DJ |
3476 | |
3477 | /* Postpone any pending signal. It was enqueued above. */ | |
3478 | signal = 0; | |
3479 | } | |
3480 | ||
fa593d66 PA |
3481 | if (fast_tp_collecting == 1) |
3482 | { | |
3483 | if (debug_threads) | |
87ce2a04 DE |
3484 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3485 | " (exit-jump-pad-bkpt)\n", | |
d86d4aaf | 3486 | lwpid_of (thread)); |
fa593d66 PA |
3487 | |
3488 | /* Postpone any pending signal. It was enqueued above. */ | |
3489 | signal = 0; | |
3490 | } | |
3491 | else if (fast_tp_collecting == 2) | |
3492 | { | |
3493 | if (debug_threads) | |
87ce2a04 DE |
3494 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3495 | " single-stepping\n", | |
d86d4aaf | 3496 | lwpid_of (thread)); |
fa593d66 PA |
3497 | |
3498 | if (can_hardware_single_step ()) | |
3499 | step = 1; | |
3500 | else | |
38e08fca GB |
3501 | { |
3502 | internal_error (__FILE__, __LINE__, | |
3503 | "moving out of jump pad single-stepping" | |
3504 | " not implemented on this target"); | |
3505 | } | |
fa593d66 PA |
3506 | |
3507 | /* Postpone any pending signal. It was enqueued above. */ | |
3508 | signal = 0; | |
3509 | } | |
3510 | ||
219f2f23 PA |
3511 | /* If we have while-stepping actions in this thread set it stepping. |
3512 | If we have a signal to deliver, it may or may not be set to | |
3513 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3514 | while-stepping into a signal handler. A possible smart thing to | |
3515 | do would be to set an internal breakpoint at the signal return | |
3516 | address, continue, and carry on catching this while-stepping | |
3517 | action only when that breakpoint is hit. A future | |
3518 | enhancement. */ | |
d86d4aaf | 3519 | if (thread->while_stepping != NULL |
219f2f23 PA |
3520 | && can_hardware_single_step ()) |
3521 | { | |
3522 | if (debug_threads) | |
87ce2a04 | 3523 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
d86d4aaf | 3524 | lwpid_of (thread)); |
219f2f23 PA |
3525 | step = 1; |
3526 | } | |
3527 | ||
582511be | 3528 | if (the_low_target.get_pc != NULL) |
0d62e5e8 | 3529 | { |
0bfdf32f | 3530 | struct regcache *regcache = get_thread_regcache (current_thread, 1); |
582511be PA |
3531 | |
3532 | lwp->stop_pc = (*the_low_target.get_pc) (regcache); | |
3533 | ||
3534 | if (debug_threads) | |
3535 | { | |
3536 | debug_printf (" %s from pc 0x%lx\n", step ? "step" : "continue", | |
3537 | (long) lwp->stop_pc); | |
3538 | } | |
0d62e5e8 DJ |
3539 | } |
3540 | ||
fa593d66 PA |
3541 | /* If we have pending signals, consume one unless we are trying to |
3542 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3543 | collect. */ | |
3544 | if (lwp->pending_signals != NULL | |
3545 | && lwp->bp_reinsert == 0 | |
3546 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3547 | { |
3548 | struct pending_signals **p_sig; | |
3549 | ||
54a0b537 | 3550 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3551 | while ((*p_sig)->prev != NULL) |
3552 | p_sig = &(*p_sig)->prev; | |
3553 | ||
3554 | signal = (*p_sig)->signal; | |
32ca6d61 | 3555 | if ((*p_sig)->info.si_signo != 0) |
d86d4aaf | 3556 | ptrace (PTRACE_SETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3557 | &(*p_sig)->info); |
32ca6d61 | 3558 | |
0d62e5e8 DJ |
3559 | free (*p_sig); |
3560 | *p_sig = NULL; | |
3561 | } | |
3562 | ||
aa5ca48f DE |
3563 | if (the_low_target.prepare_to_resume != NULL) |
3564 | the_low_target.prepare_to_resume (lwp); | |
3565 | ||
d86d4aaf | 3566 | regcache_invalidate_thread (thread); |
da6d8c04 | 3567 | errno = 0; |
54a0b537 | 3568 | lwp->stepping = step; |
d86d4aaf | 3569 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (thread), |
b8e1b30e | 3570 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3571 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3572 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3573 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 | 3574 | |
0bfdf32f | 3575 | current_thread = saved_thread; |
da6d8c04 | 3576 | if (errno) |
23f238d3 PA |
3577 | perror_with_name ("resuming thread"); |
3578 | ||
3579 | /* Successfully resumed. Clear state that no longer makes sense, | |
3580 | and mark the LWP as running. Must not do this before resuming | |
3581 | otherwise if that fails other code will be confused. E.g., we'd | |
3582 | later try to stop the LWP and hang forever waiting for a stop | |
3583 | status. Note that we must not throw after this is cleared, | |
3584 | otherwise handle_zombie_lwp_error would get confused. */ | |
3585 | lwp->stopped = 0; | |
3586 | lwp->stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3587 | } | |
3588 | ||
3589 | /* Called when we try to resume a stopped LWP and that errors out. If | |
3590 | the LWP is no longer in ptrace-stopped state (meaning it's zombie, | |
3591 | or about to become), discard the error, clear any pending status | |
3592 | the LWP may have, and return true (we'll collect the exit status | |
3593 | soon enough). Otherwise, return false. */ | |
3594 | ||
3595 | static int | |
3596 | check_ptrace_stopped_lwp_gone (struct lwp_info *lp) | |
3597 | { | |
3598 | struct thread_info *thread = get_lwp_thread (lp); | |
3599 | ||
3600 | /* If we get an error after resuming the LWP successfully, we'd | |
3601 | confuse !T state for the LWP being gone. */ | |
3602 | gdb_assert (lp->stopped); | |
3603 | ||
3604 | /* We can't just check whether the LWP is in 'Z (Zombie)' state, | |
3605 | because even if ptrace failed with ESRCH, the tracee may be "not | |
3606 | yet fully dead", but already refusing ptrace requests. In that | |
3607 | case the tracee has 'R (Running)' state for a little bit | |
3608 | (observed in Linux 3.18). See also the note on ESRCH in the | |
3609 | ptrace(2) man page. Instead, check whether the LWP has any state | |
3610 | other than ptrace-stopped. */ | |
3611 | ||
3612 | /* Don't assume anything if /proc/PID/status can't be read. */ | |
3613 | if (linux_proc_pid_is_trace_stopped_nowarn (lwpid_of (thread)) == 0) | |
3221518c | 3614 | { |
23f238d3 PA |
3615 | lp->stop_reason = TARGET_STOPPED_BY_NO_REASON; |
3616 | lp->status_pending_p = 0; | |
3617 | return 1; | |
3618 | } | |
3619 | return 0; | |
3620 | } | |
3621 | ||
3622 | /* Like linux_resume_one_lwp_throw, but no error is thrown if the LWP | |
3623 | disappears while we try to resume it. */ | |
3221518c | 3624 | |
23f238d3 PA |
3625 | static void |
3626 | linux_resume_one_lwp (struct lwp_info *lwp, | |
3627 | int step, int signal, siginfo_t *info) | |
3628 | { | |
3629 | TRY | |
3630 | { | |
3631 | linux_resume_one_lwp_throw (lwp, step, signal, info); | |
3632 | } | |
3633 | CATCH (ex, RETURN_MASK_ERROR) | |
3634 | { | |
3635 | if (!check_ptrace_stopped_lwp_gone (lwp)) | |
3636 | throw_exception (ex); | |
3221518c | 3637 | } |
23f238d3 | 3638 | END_CATCH |
da6d8c04 DJ |
3639 | } |
3640 | ||
2bd7c093 PA |
3641 | struct thread_resume_array |
3642 | { | |
3643 | struct thread_resume *resume; | |
3644 | size_t n; | |
3645 | }; | |
64386c31 | 3646 | |
ebcf782c DE |
3647 | /* This function is called once per thread via find_inferior. |
3648 | ARG is a pointer to a thread_resume_array struct. | |
3649 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3650 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3651 | |
3652 | This algorithm is O(threads * resume elements), but resume elements | |
3653 | is small (and will remain small at least until GDB supports thread | |
3654 | suspension). */ | |
ebcf782c | 3655 | |
2bd7c093 PA |
3656 | static int |
3657 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3658 | { |
d86d4aaf DE |
3659 | struct thread_info *thread = (struct thread_info *) entry; |
3660 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3661 | int ndx; |
2bd7c093 | 3662 | struct thread_resume_array *r; |
64386c31 | 3663 | |
2bd7c093 | 3664 | r = arg; |
64386c31 | 3665 | |
2bd7c093 | 3666 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3667 | { |
3668 | ptid_t ptid = r->resume[ndx].thread; | |
3669 | if (ptid_equal (ptid, minus_one_ptid) | |
3670 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3671 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3672 | of PID'. */ | |
d86d4aaf | 3673 | || (ptid_get_pid (ptid) == pid_of (thread) |
0c9070b3 YQ |
3674 | && (ptid_is_pid (ptid) |
3675 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3676 | { |
d50171e4 | 3677 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3678 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3679 | { |
3680 | if (debug_threads) | |
87ce2a04 DE |
3681 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3682 | (thread->last_status.kind | |
3683 | == TARGET_WAITKIND_STOPPED) | |
3684 | ? "stopped" | |
3685 | : "stopping", | |
d86d4aaf | 3686 | lwpid_of (thread)); |
d50171e4 PA |
3687 | |
3688 | continue; | |
3689 | } | |
3690 | ||
95954743 | 3691 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3692 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3693 | |
c2d6af84 PA |
3694 | lwp->step_range_start = lwp->resume->step_range_start; |
3695 | lwp->step_range_end = lwp->resume->step_range_end; | |
3696 | ||
fa593d66 PA |
3697 | /* If we had a deferred signal to report, dequeue one now. |
3698 | This can happen if LWP gets more than one signal while | |
3699 | trying to get out of a jump pad. */ | |
3700 | if (lwp->stopped | |
3701 | && !lwp->status_pending_p | |
3702 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3703 | { | |
3704 | lwp->status_pending_p = 1; | |
3705 | ||
3706 | if (debug_threads) | |
87ce2a04 DE |
3707 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3708 | "leaving status pending.\n", | |
d86d4aaf DE |
3709 | WSTOPSIG (lwp->status_pending), |
3710 | lwpid_of (thread)); | |
fa593d66 PA |
3711 | } |
3712 | ||
95954743 PA |
3713 | return 0; |
3714 | } | |
3715 | } | |
2bd7c093 PA |
3716 | |
3717 | /* No resume action for this thread. */ | |
3718 | lwp->resume = NULL; | |
64386c31 | 3719 | |
2bd7c093 | 3720 | return 0; |
5544ad89 DJ |
3721 | } |
3722 | ||
20ad9378 DE |
3723 | /* find_inferior callback for linux_resume. |
3724 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3725 | |
bd99dc85 PA |
3726 | static int |
3727 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3728 | { |
d86d4aaf DE |
3729 | struct thread_info *thread = (struct thread_info *) entry; |
3730 | struct lwp_info *lwp = get_thread_lwp (thread); | |
5544ad89 | 3731 | |
bd99dc85 PA |
3732 | /* LWPs which will not be resumed are not interesting, because |
3733 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3734 | if (lwp->resume == NULL) |
bd99dc85 | 3735 | return 0; |
64386c31 | 3736 | |
582511be | 3737 | if (thread_still_has_status_pending_p (thread)) |
d50171e4 PA |
3738 | * (int *) flag_p = 1; |
3739 | ||
3740 | return 0; | |
3741 | } | |
3742 | ||
3743 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3744 | internal breakpoint that we need to step over. It assumes that any | |
3745 | required STOP_PC adjustment has already been propagated to the | |
3746 | inferior's regcache. */ | |
3747 | ||
3748 | static int | |
3749 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3750 | { | |
d86d4aaf DE |
3751 | struct thread_info *thread = (struct thread_info *) entry; |
3752 | struct lwp_info *lwp = get_thread_lwp (thread); | |
0bfdf32f | 3753 | struct thread_info *saved_thread; |
d50171e4 PA |
3754 | CORE_ADDR pc; |
3755 | ||
3756 | /* LWPs which will not be resumed are not interesting, because we | |
3757 | might not wait for them next time through linux_wait. */ | |
3758 | ||
3759 | if (!lwp->stopped) | |
3760 | { | |
3761 | if (debug_threads) | |
87ce2a04 | 3762 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
d86d4aaf | 3763 | lwpid_of (thread)); |
d50171e4 PA |
3764 | return 0; |
3765 | } | |
3766 | ||
8336d594 | 3767 | if (thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3768 | { |
3769 | if (debug_threads) | |
87ce2a04 DE |
3770 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3771 | " stopped\n", | |
d86d4aaf | 3772 | lwpid_of (thread)); |
d50171e4 PA |
3773 | return 0; |
3774 | } | |
3775 | ||
7984d532 PA |
3776 | gdb_assert (lwp->suspended >= 0); |
3777 | ||
3778 | if (lwp->suspended) | |
3779 | { | |
3780 | if (debug_threads) | |
87ce2a04 | 3781 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
d86d4aaf | 3782 | lwpid_of (thread)); |
7984d532 PA |
3783 | return 0; |
3784 | } | |
3785 | ||
d50171e4 PA |
3786 | if (!lwp->need_step_over) |
3787 | { | |
3788 | if (debug_threads) | |
d86d4aaf | 3789 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (thread)); |
d50171e4 | 3790 | } |
5544ad89 | 3791 | |
bd99dc85 | 3792 | if (lwp->status_pending_p) |
d50171e4 PA |
3793 | { |
3794 | if (debug_threads) | |
87ce2a04 DE |
3795 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3796 | " status.\n", | |
d86d4aaf | 3797 | lwpid_of (thread)); |
d50171e4 PA |
3798 | return 0; |
3799 | } | |
3800 | ||
3801 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3802 | or we have. */ | |
3803 | pc = get_pc (lwp); | |
3804 | ||
3805 | /* If the PC has changed since we stopped, then don't do anything, | |
3806 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3807 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3808 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3809 | command, or poked thread's registers herself. */ | |
3810 | if (pc != lwp->stop_pc) | |
3811 | { | |
3812 | if (debug_threads) | |
87ce2a04 DE |
3813 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3814 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
d86d4aaf DE |
3815 | lwpid_of (thread), |
3816 | paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3817 | |
3818 | lwp->need_step_over = 0; | |
3819 | return 0; | |
3820 | } | |
3821 | ||
0bfdf32f GB |
3822 | saved_thread = current_thread; |
3823 | current_thread = thread; | |
d50171e4 | 3824 | |
8b07ae33 | 3825 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3826 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3827 | { |
8b07ae33 | 3828 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3829 | though. If the condition is being evaluated on the target's side |
3830 | and it evaluate to false, step over this breakpoint as well. */ | |
3831 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3832 | && gdb_condition_true_at_breakpoint (pc) |
3833 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3834 | { |
3835 | if (debug_threads) | |
87ce2a04 DE |
3836 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3837 | " GDB breakpoint at 0x%s; skipping step over\n", | |
d86d4aaf | 3838 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3839 | |
0bfdf32f | 3840 | current_thread = saved_thread; |
8b07ae33 PA |
3841 | return 0; |
3842 | } | |
3843 | else | |
3844 | { | |
3845 | if (debug_threads) | |
87ce2a04 DE |
3846 | debug_printf ("Need step over [LWP %ld]? yes, " |
3847 | "found breakpoint at 0x%s\n", | |
d86d4aaf | 3848 | lwpid_of (thread), paddress (pc)); |
d50171e4 | 3849 | |
8b07ae33 PA |
3850 | /* We've found an lwp that needs stepping over --- return 1 so |
3851 | that find_inferior stops looking. */ | |
0bfdf32f | 3852 | current_thread = saved_thread; |
8b07ae33 PA |
3853 | |
3854 | /* If the step over is cancelled, this is set again. */ | |
3855 | lwp->need_step_over = 0; | |
3856 | return 1; | |
3857 | } | |
d50171e4 PA |
3858 | } |
3859 | ||
0bfdf32f | 3860 | current_thread = saved_thread; |
d50171e4 PA |
3861 | |
3862 | if (debug_threads) | |
87ce2a04 DE |
3863 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3864 | " at 0x%s\n", | |
d86d4aaf | 3865 | lwpid_of (thread), paddress (pc)); |
c6ecbae5 | 3866 | |
bd99dc85 | 3867 | return 0; |
5544ad89 DJ |
3868 | } |
3869 | ||
d50171e4 PA |
3870 | /* Start a step-over operation on LWP. When LWP stopped at a |
3871 | breakpoint, to make progress, we need to remove the breakpoint out | |
3872 | of the way. If we let other threads run while we do that, they may | |
3873 | pass by the breakpoint location and miss hitting it. To avoid | |
3874 | that, a step-over momentarily stops all threads while LWP is | |
3875 | single-stepped while the breakpoint is temporarily uninserted from | |
3876 | the inferior. When the single-step finishes, we reinsert the | |
3877 | breakpoint, and let all threads that are supposed to be running, | |
3878 | run again. | |
3879 | ||
3880 | On targets that don't support hardware single-step, we don't | |
3881 | currently support full software single-stepping. Instead, we only | |
3882 | support stepping over the thread event breakpoint, by asking the | |
3883 | low target where to place a reinsert breakpoint. Since this | |
3884 | routine assumes the breakpoint being stepped over is a thread event | |
3885 | breakpoint, it usually assumes the return address of the current | |
3886 | function is a good enough place to set the reinsert breakpoint. */ | |
3887 | ||
3888 | static int | |
3889 | start_step_over (struct lwp_info *lwp) | |
3890 | { | |
d86d4aaf | 3891 | struct thread_info *thread = get_lwp_thread (lwp); |
0bfdf32f | 3892 | struct thread_info *saved_thread; |
d50171e4 PA |
3893 | CORE_ADDR pc; |
3894 | int step; | |
3895 | ||
3896 | if (debug_threads) | |
87ce2a04 | 3897 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
d86d4aaf | 3898 | lwpid_of (thread)); |
d50171e4 | 3899 | |
7984d532 PA |
3900 | stop_all_lwps (1, lwp); |
3901 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3902 | |
3903 | if (debug_threads) | |
87ce2a04 | 3904 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3905 | |
3906 | /* Note, we should always reach here with an already adjusted PC, | |
3907 | either by GDB (if we're resuming due to GDB's request), or by our | |
3908 | caller, if we just finished handling an internal breakpoint GDB | |
3909 | shouldn't care about. */ | |
3910 | pc = get_pc (lwp); | |
3911 | ||
0bfdf32f GB |
3912 | saved_thread = current_thread; |
3913 | current_thread = thread; | |
d50171e4 PA |
3914 | |
3915 | lwp->bp_reinsert = pc; | |
3916 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3917 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3918 | |
3919 | if (can_hardware_single_step ()) | |
3920 | { | |
3921 | step = 1; | |
3922 | } | |
3923 | else | |
3924 | { | |
3925 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3926 | set_reinsert_breakpoint (raddr); | |
3927 | step = 0; | |
3928 | } | |
3929 | ||
0bfdf32f | 3930 | current_thread = saved_thread; |
d50171e4 PA |
3931 | |
3932 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3933 | ||
3934 | /* Require next event from this LWP. */ | |
d86d4aaf | 3935 | step_over_bkpt = thread->entry.id; |
d50171e4 PA |
3936 | return 1; |
3937 | } | |
3938 | ||
3939 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3940 | start_step_over, if still there, and delete any reinsert | |
3941 | breakpoints we've set, on non hardware single-step targets. */ | |
3942 | ||
3943 | static int | |
3944 | finish_step_over (struct lwp_info *lwp) | |
3945 | { | |
3946 | if (lwp->bp_reinsert != 0) | |
3947 | { | |
3948 | if (debug_threads) | |
87ce2a04 | 3949 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3950 | |
3951 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3952 | may be no breakpoint to reinsert there by now. */ | |
3953 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3954 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3955 | |
3956 | lwp->bp_reinsert = 0; | |
3957 | ||
3958 | /* Delete any software-single-step reinsert breakpoints. No | |
3959 | longer needed. We don't have to worry about other threads | |
3960 | hitting this trap, and later not being able to explain it, | |
3961 | because we were stepping over a breakpoint, and we hold all | |
3962 | threads but LWP stopped while doing that. */ | |
3963 | if (!can_hardware_single_step ()) | |
3964 | delete_reinsert_breakpoints (); | |
3965 | ||
3966 | step_over_bkpt = null_ptid; | |
3967 | return 1; | |
3968 | } | |
3969 | else | |
3970 | return 0; | |
3971 | } | |
3972 | ||
5544ad89 DJ |
3973 | /* This function is called once per thread. We check the thread's resume |
3974 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3975 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3976 | |
bd99dc85 PA |
3977 | For threads which we aren't explicitly told otherwise, we preserve |
3978 | the stepping flag; this is used for stepping over gdbserver-placed | |
3979 | breakpoints. | |
3980 | ||
3981 | If pending_flags was set in any thread, we queue any needed | |
3982 | signals, since we won't actually resume. We already have a pending | |
3983 | event to report, so we don't need to preserve any step requests; | |
3984 | they should be re-issued if necessary. */ | |
3985 | ||
3986 | static int | |
3987 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3988 | { |
d86d4aaf DE |
3989 | struct thread_info *thread = (struct thread_info *) entry; |
3990 | struct lwp_info *lwp = get_thread_lwp (thread); | |
bd99dc85 | 3991 | int step; |
d50171e4 PA |
3992 | int leave_all_stopped = * (int *) arg; |
3993 | int leave_pending; | |
5544ad89 | 3994 | |
2bd7c093 | 3995 | if (lwp->resume == NULL) |
bd99dc85 | 3996 | return 0; |
5544ad89 | 3997 | |
bd99dc85 | 3998 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3999 | { |
bd99dc85 | 4000 | if (debug_threads) |
d86d4aaf | 4001 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (thread)); |
bd99dc85 PA |
4002 | |
4003 | if (!lwp->stopped) | |
4004 | { | |
4005 | if (debug_threads) | |
d86d4aaf | 4006 | debug_printf ("stopping LWP %ld\n", lwpid_of (thread)); |
bd99dc85 | 4007 | |
d50171e4 PA |
4008 | /* Stop the thread, and wait for the event asynchronously, |
4009 | through the event loop. */ | |
02fc4de7 | 4010 | send_sigstop (lwp); |
bd99dc85 PA |
4011 | } |
4012 | else | |
4013 | { | |
4014 | if (debug_threads) | |
87ce2a04 | 4015 | debug_printf ("already stopped LWP %ld\n", |
d86d4aaf | 4016 | lwpid_of (thread)); |
d50171e4 PA |
4017 | |
4018 | /* The LWP may have been stopped in an internal event that | |
4019 | was not meant to be notified back to GDB (e.g., gdbserver | |
4020 | breakpoint), so we should be reporting a stop event in | |
4021 | this case too. */ | |
4022 | ||
4023 | /* If the thread already has a pending SIGSTOP, this is a | |
4024 | no-op. Otherwise, something later will presumably resume | |
4025 | the thread and this will cause it to cancel any pending | |
4026 | operation, due to last_resume_kind == resume_stop. If | |
4027 | the thread already has a pending status to report, we | |
4028 | will still report it the next time we wait - see | |
4029 | status_pending_p_callback. */ | |
1a981360 PA |
4030 | |
4031 | /* If we already have a pending signal to report, then | |
4032 | there's no need to queue a SIGSTOP, as this means we're | |
4033 | midway through moving the LWP out of the jumppad, and we | |
4034 | will report the pending signal as soon as that is | |
4035 | finished. */ | |
4036 | if (lwp->pending_signals_to_report == NULL) | |
4037 | send_sigstop (lwp); | |
bd99dc85 | 4038 | } |
32ca6d61 | 4039 | |
bd99dc85 PA |
4040 | /* For stop requests, we're done. */ |
4041 | lwp->resume = NULL; | |
fc7238bb | 4042 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4043 | return 0; |
5544ad89 DJ |
4044 | } |
4045 | ||
bd99dc85 PA |
4046 | /* If this thread which is about to be resumed has a pending status, |
4047 | then don't resume any threads - we can just report the pending | |
4048 | status. Make sure to queue any signals that would otherwise be | |
4049 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
4050 | thread has a pending status. If there's a thread that needs the |
4051 | step-over-breakpoint dance, then don't resume any other thread | |
4052 | but that particular one. */ | |
4053 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 4054 | |
d50171e4 | 4055 | if (!leave_pending) |
bd99dc85 PA |
4056 | { |
4057 | if (debug_threads) | |
d86d4aaf | 4058 | debug_printf ("resuming LWP %ld\n", lwpid_of (thread)); |
5544ad89 | 4059 | |
d50171e4 | 4060 | step = (lwp->resume->kind == resume_step); |
2acc282a | 4061 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
4062 | } |
4063 | else | |
4064 | { | |
4065 | if (debug_threads) | |
d86d4aaf | 4066 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (thread)); |
5544ad89 | 4067 | |
bd99dc85 PA |
4068 | /* If we have a new signal, enqueue the signal. */ |
4069 | if (lwp->resume->sig != 0) | |
4070 | { | |
4071 | struct pending_signals *p_sig; | |
4072 | p_sig = xmalloc (sizeof (*p_sig)); | |
4073 | p_sig->prev = lwp->pending_signals; | |
4074 | p_sig->signal = lwp->resume->sig; | |
4075 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
4076 | ||
4077 | /* If this is the same signal we were previously stopped by, | |
4078 | make sure to queue its siginfo. We can ignore the return | |
4079 | value of ptrace; if it fails, we'll skip | |
4080 | PTRACE_SETSIGINFO. */ | |
4081 | if (WIFSTOPPED (lwp->last_status) | |
4082 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
d86d4aaf | 4083 | ptrace (PTRACE_GETSIGINFO, lwpid_of (thread), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 4084 | &p_sig->info); |
bd99dc85 PA |
4085 | |
4086 | lwp->pending_signals = p_sig; | |
4087 | } | |
4088 | } | |
5544ad89 | 4089 | |
fc7238bb | 4090 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 4091 | lwp->resume = NULL; |
5544ad89 | 4092 | return 0; |
0d62e5e8 DJ |
4093 | } |
4094 | ||
4095 | static void | |
2bd7c093 | 4096 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 4097 | { |
2bd7c093 | 4098 | struct thread_resume_array array = { resume_info, n }; |
d86d4aaf | 4099 | struct thread_info *need_step_over = NULL; |
d50171e4 PA |
4100 | int any_pending; |
4101 | int leave_all_stopped; | |
c6ecbae5 | 4102 | |
87ce2a04 DE |
4103 | if (debug_threads) |
4104 | { | |
4105 | debug_enter (); | |
4106 | debug_printf ("linux_resume:\n"); | |
4107 | } | |
4108 | ||
2bd7c093 | 4109 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 4110 | |
d50171e4 PA |
4111 | /* If there is a thread which would otherwise be resumed, which has |
4112 | a pending status, then don't resume any threads - we can just | |
4113 | report the pending status. Make sure to queue any signals that | |
4114 | would otherwise be sent. In non-stop mode, we'll apply this | |
4115 | logic to each thread individually. We consume all pending events | |
4116 | before considering to start a step-over (in all-stop). */ | |
4117 | any_pending = 0; | |
bd99dc85 | 4118 | if (!non_stop) |
d86d4aaf | 4119 | find_inferior (&all_threads, resume_status_pending_p, &any_pending); |
d50171e4 PA |
4120 | |
4121 | /* If there is a thread which would otherwise be resumed, which is | |
4122 | stopped at a breakpoint that needs stepping over, then don't | |
4123 | resume any threads - have it step over the breakpoint with all | |
4124 | other threads stopped, then resume all threads again. Make sure | |
4125 | to queue any signals that would otherwise be delivered or | |
4126 | queued. */ | |
4127 | if (!any_pending && supports_breakpoints ()) | |
4128 | need_step_over | |
d86d4aaf DE |
4129 | = (struct thread_info *) find_inferior (&all_threads, |
4130 | need_step_over_p, NULL); | |
d50171e4 PA |
4131 | |
4132 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
4133 | ||
4134 | if (debug_threads) | |
4135 | { | |
4136 | if (need_step_over != NULL) | |
87ce2a04 | 4137 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 4138 | else if (any_pending) |
87ce2a04 DE |
4139 | debug_printf ("Not resuming, all-stop and found " |
4140 | "an LWP with pending status\n"); | |
d50171e4 | 4141 | else |
87ce2a04 | 4142 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
4143 | } |
4144 | ||
4145 | /* Even if we're leaving threads stopped, queue all signals we'd | |
4146 | otherwise deliver. */ | |
4147 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
4148 | ||
4149 | if (need_step_over) | |
d86d4aaf | 4150 | start_step_over (get_thread_lwp (need_step_over)); |
87ce2a04 DE |
4151 | |
4152 | if (debug_threads) | |
4153 | { | |
4154 | debug_printf ("linux_resume done\n"); | |
4155 | debug_exit (); | |
4156 | } | |
d50171e4 PA |
4157 | } |
4158 | ||
4159 | /* This function is called once per thread. We check the thread's | |
4160 | last resume request, which will tell us whether to resume, step, or | |
4161 | leave the thread stopped. Any signal the client requested to be | |
4162 | delivered has already been enqueued at this point. | |
4163 | ||
4164 | If any thread that GDB wants running is stopped at an internal | |
4165 | breakpoint that needs stepping over, we start a step-over operation | |
4166 | on that particular thread, and leave all others stopped. */ | |
4167 | ||
7984d532 PA |
4168 | static int |
4169 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 4170 | { |
d86d4aaf DE |
4171 | struct thread_info *thread = (struct thread_info *) entry; |
4172 | struct lwp_info *lwp = get_thread_lwp (thread); | |
d50171e4 PA |
4173 | int step; |
4174 | ||
7984d532 PA |
4175 | if (lwp == except) |
4176 | return 0; | |
d50171e4 PA |
4177 | |
4178 | if (debug_threads) | |
d86d4aaf | 4179 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (thread)); |
d50171e4 PA |
4180 | |
4181 | if (!lwp->stopped) | |
4182 | { | |
4183 | if (debug_threads) | |
d86d4aaf | 4184 | debug_printf (" LWP %ld already running\n", lwpid_of (thread)); |
7984d532 | 4185 | return 0; |
d50171e4 PA |
4186 | } |
4187 | ||
02fc4de7 PA |
4188 | if (thread->last_resume_kind == resume_stop |
4189 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
4190 | { |
4191 | if (debug_threads) | |
87ce2a04 | 4192 | debug_printf (" client wants LWP to remain %ld stopped\n", |
d86d4aaf | 4193 | lwpid_of (thread)); |
7984d532 | 4194 | return 0; |
d50171e4 PA |
4195 | } |
4196 | ||
4197 | if (lwp->status_pending_p) | |
4198 | { | |
4199 | if (debug_threads) | |
87ce2a04 | 4200 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
d86d4aaf | 4201 | lwpid_of (thread)); |
7984d532 | 4202 | return 0; |
d50171e4 PA |
4203 | } |
4204 | ||
7984d532 PA |
4205 | gdb_assert (lwp->suspended >= 0); |
4206 | ||
d50171e4 PA |
4207 | if (lwp->suspended) |
4208 | { | |
4209 | if (debug_threads) | |
d86d4aaf | 4210 | debug_printf (" LWP %ld is suspended\n", lwpid_of (thread)); |
7984d532 | 4211 | return 0; |
d50171e4 PA |
4212 | } |
4213 | ||
1a981360 PA |
4214 | if (thread->last_resume_kind == resume_stop |
4215 | && lwp->pending_signals_to_report == NULL | |
4216 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
4217 | { |
4218 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
4219 | last_status.kind check above would catch it, and we wouldn't | |
4220 | reach here. This LWP may have been momentarily paused by a | |
4221 | stop_all_lwps call while handling for example, another LWP's | |
4222 | step-over. In that case, the pending expected SIGSTOP signal | |
4223 | that was queued at vCont;t handling time will have already | |
4224 | been consumed by wait_for_sigstop, and so we need to requeue | |
4225 | another one here. Note that if the LWP already has a SIGSTOP | |
4226 | pending, this is a no-op. */ | |
4227 | ||
4228 | if (debug_threads) | |
87ce2a04 DE |
4229 | debug_printf ("Client wants LWP %ld to stop. " |
4230 | "Making sure it has a SIGSTOP pending\n", | |
d86d4aaf | 4231 | lwpid_of (thread)); |
02fc4de7 PA |
4232 | |
4233 | send_sigstop (lwp); | |
4234 | } | |
4235 | ||
8336d594 | 4236 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 4237 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
4238 | return 0; |
4239 | } | |
4240 | ||
4241 | static int | |
4242 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
4243 | { | |
d86d4aaf DE |
4244 | struct thread_info *thread = (struct thread_info *) entry; |
4245 | struct lwp_info *lwp = get_thread_lwp (thread); | |
7984d532 PA |
4246 | |
4247 | if (lwp == except) | |
4248 | return 0; | |
4249 | ||
4250 | lwp->suspended--; | |
4251 | gdb_assert (lwp->suspended >= 0); | |
4252 | ||
4253 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
4254 | } |
4255 | ||
4256 | /* When we finish a step-over, set threads running again. If there's | |
4257 | another thread that may need a step-over, now's the time to start | |
4258 | it. Eventually, we'll move all threads past their breakpoints. */ | |
4259 | ||
4260 | static void | |
4261 | proceed_all_lwps (void) | |
4262 | { | |
d86d4aaf | 4263 | struct thread_info *need_step_over; |
d50171e4 PA |
4264 | |
4265 | /* If there is a thread which would otherwise be resumed, which is | |
4266 | stopped at a breakpoint that needs stepping over, then don't | |
4267 | resume any threads - have it step over the breakpoint with all | |
4268 | other threads stopped, then resume all threads again. */ | |
4269 | ||
4270 | if (supports_breakpoints ()) | |
4271 | { | |
4272 | need_step_over | |
d86d4aaf DE |
4273 | = (struct thread_info *) find_inferior (&all_threads, |
4274 | need_step_over_p, NULL); | |
d50171e4 PA |
4275 | |
4276 | if (need_step_over != NULL) | |
4277 | { | |
4278 | if (debug_threads) | |
87ce2a04 DE |
4279 | debug_printf ("proceed_all_lwps: found " |
4280 | "thread %ld needing a step-over\n", | |
4281 | lwpid_of (need_step_over)); | |
d50171e4 | 4282 | |
d86d4aaf | 4283 | start_step_over (get_thread_lwp (need_step_over)); |
d50171e4 PA |
4284 | return; |
4285 | } | |
4286 | } | |
5544ad89 | 4287 | |
d50171e4 | 4288 | if (debug_threads) |
87ce2a04 | 4289 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 4290 | |
d86d4aaf | 4291 | find_inferior (&all_threads, proceed_one_lwp, NULL); |
d50171e4 PA |
4292 | } |
4293 | ||
4294 | /* Stopped LWPs that the client wanted to be running, that don't have | |
4295 | pending statuses, are set to run again, except for EXCEPT, if not | |
4296 | NULL. This undoes a stop_all_lwps call. */ | |
4297 | ||
4298 | static void | |
7984d532 | 4299 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 4300 | { |
5544ad89 DJ |
4301 | if (debug_threads) |
4302 | { | |
87ce2a04 | 4303 | debug_enter (); |
d50171e4 | 4304 | if (except) |
87ce2a04 | 4305 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
d86d4aaf | 4306 | lwpid_of (get_lwp_thread (except))); |
5544ad89 | 4307 | else |
87ce2a04 | 4308 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
4309 | } |
4310 | ||
7984d532 | 4311 | if (unsuspend) |
d86d4aaf | 4312 | find_inferior (&all_threads, unsuspend_and_proceed_one_lwp, except); |
7984d532 | 4313 | else |
d86d4aaf | 4314 | find_inferior (&all_threads, proceed_one_lwp, except); |
87ce2a04 DE |
4315 | |
4316 | if (debug_threads) | |
4317 | { | |
4318 | debug_printf ("unstop_all_lwps done\n"); | |
4319 | debug_exit (); | |
4320 | } | |
0d62e5e8 DJ |
4321 | } |
4322 | ||
58caa3dc DJ |
4323 | |
4324 | #ifdef HAVE_LINUX_REGSETS | |
4325 | ||
1faeff08 MR |
4326 | #define use_linux_regsets 1 |
4327 | ||
030031ee PA |
4328 | /* Returns true if REGSET has been disabled. */ |
4329 | ||
4330 | static int | |
4331 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4332 | { | |
4333 | return (info->disabled_regsets != NULL | |
4334 | && info->disabled_regsets[regset - info->regsets]); | |
4335 | } | |
4336 | ||
4337 | /* Disable REGSET. */ | |
4338 | ||
4339 | static void | |
4340 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4341 | { | |
4342 | int dr_offset; | |
4343 | ||
4344 | dr_offset = regset - info->regsets; | |
4345 | if (info->disabled_regsets == NULL) | |
4346 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4347 | info->disabled_regsets[dr_offset] = 1; | |
4348 | } | |
4349 | ||
58caa3dc | 4350 | static int |
3aee8918 PA |
4351 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4352 | struct regcache *regcache) | |
58caa3dc DJ |
4353 | { |
4354 | struct regset_info *regset; | |
e9d25b98 | 4355 | int saw_general_regs = 0; |
95954743 | 4356 | int pid; |
1570b33e | 4357 | struct iovec iov; |
58caa3dc | 4358 | |
0bfdf32f | 4359 | pid = lwpid_of (current_thread); |
28eef672 | 4360 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4361 | { |
1570b33e L |
4362 | void *buf, *data; |
4363 | int nt_type, res; | |
58caa3dc | 4364 | |
030031ee | 4365 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
28eef672 | 4366 | continue; |
58caa3dc | 4367 | |
bca929d3 | 4368 | buf = xmalloc (regset->size); |
1570b33e L |
4369 | |
4370 | nt_type = regset->nt_type; | |
4371 | if (nt_type) | |
4372 | { | |
4373 | iov.iov_base = buf; | |
4374 | iov.iov_len = regset->size; | |
4375 | data = (void *) &iov; | |
4376 | } | |
4377 | else | |
4378 | data = buf; | |
4379 | ||
dfb64f85 | 4380 | #ifndef __sparc__ |
f15f9948 | 4381 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4382 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4383 | #else |
1570b33e | 4384 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4385 | #endif |
58caa3dc DJ |
4386 | if (res < 0) |
4387 | { | |
4388 | if (errno == EIO) | |
4389 | { | |
52fa2412 | 4390 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4391 | this process mode. */ |
030031ee | 4392 | disable_regset (regsets_info, regset); |
58caa3dc | 4393 | } |
e5a9158d AA |
4394 | else if (errno == ENODATA) |
4395 | { | |
4396 | /* ENODATA may be returned if the regset is currently | |
4397 | not "active". This can happen in normal operation, | |
4398 | so suppress the warning in this case. */ | |
4399 | } | |
58caa3dc DJ |
4400 | else |
4401 | { | |
0d62e5e8 | 4402 | char s[256]; |
95954743 PA |
4403 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4404 | pid); | |
0d62e5e8 | 4405 | perror (s); |
58caa3dc DJ |
4406 | } |
4407 | } | |
098dbe61 AA |
4408 | else |
4409 | { | |
4410 | if (regset->type == GENERAL_REGS) | |
4411 | saw_general_regs = 1; | |
4412 | regset->store_function (regcache, buf); | |
4413 | } | |
fdeb2a12 | 4414 | free (buf); |
58caa3dc | 4415 | } |
e9d25b98 DJ |
4416 | if (saw_general_regs) |
4417 | return 0; | |
4418 | else | |
4419 | return 1; | |
58caa3dc DJ |
4420 | } |
4421 | ||
4422 | static int | |
3aee8918 PA |
4423 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4424 | struct regcache *regcache) | |
58caa3dc DJ |
4425 | { |
4426 | struct regset_info *regset; | |
e9d25b98 | 4427 | int saw_general_regs = 0; |
95954743 | 4428 | int pid; |
1570b33e | 4429 | struct iovec iov; |
58caa3dc | 4430 | |
0bfdf32f | 4431 | pid = lwpid_of (current_thread); |
28eef672 | 4432 | for (regset = regsets_info->regsets; regset->size >= 0; regset++) |
58caa3dc | 4433 | { |
1570b33e L |
4434 | void *buf, *data; |
4435 | int nt_type, res; | |
58caa3dc | 4436 | |
feea5f36 AA |
4437 | if (regset->size == 0 || regset_disabled (regsets_info, regset) |
4438 | || regset->fill_function == NULL) | |
28eef672 | 4439 | continue; |
58caa3dc | 4440 | |
bca929d3 | 4441 | buf = xmalloc (regset->size); |
545587ee DJ |
4442 | |
4443 | /* First fill the buffer with the current register set contents, | |
4444 | in case there are any items in the kernel's regset that are | |
4445 | not in gdbserver's regcache. */ | |
1570b33e L |
4446 | |
4447 | nt_type = regset->nt_type; | |
4448 | if (nt_type) | |
4449 | { | |
4450 | iov.iov_base = buf; | |
4451 | iov.iov_len = regset->size; | |
4452 | data = (void *) &iov; | |
4453 | } | |
4454 | else | |
4455 | data = buf; | |
4456 | ||
dfb64f85 | 4457 | #ifndef __sparc__ |
f15f9948 | 4458 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4459 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4460 | #else |
689cc2ae | 4461 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4462 | #endif |
545587ee DJ |
4463 | |
4464 | if (res == 0) | |
4465 | { | |
4466 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4467 | regset->fill_function (regcache, buf); |
545587ee DJ |
4468 | |
4469 | /* Only now do we write the register set. */ | |
dfb64f85 | 4470 | #ifndef __sparc__ |
f15f9948 | 4471 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4472 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4473 | #else |
1570b33e | 4474 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4475 | #endif |
545587ee DJ |
4476 | } |
4477 | ||
58caa3dc DJ |
4478 | if (res < 0) |
4479 | { | |
4480 | if (errno == EIO) | |
4481 | { | |
52fa2412 | 4482 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4483 | this process mode. */ |
030031ee | 4484 | disable_regset (regsets_info, regset); |
58caa3dc | 4485 | } |
3221518c UW |
4486 | else if (errno == ESRCH) |
4487 | { | |
1b3f6016 PA |
4488 | /* At this point, ESRCH should mean the process is |
4489 | already gone, in which case we simply ignore attempts | |
4490 | to change its registers. See also the related | |
4491 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4492 | free (buf); |
3221518c UW |
4493 | return 0; |
4494 | } | |
58caa3dc DJ |
4495 | else |
4496 | { | |
ce3a066d | 4497 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4498 | } |
4499 | } | |
e9d25b98 DJ |
4500 | else if (regset->type == GENERAL_REGS) |
4501 | saw_general_regs = 1; | |
09ec9b38 | 4502 | free (buf); |
58caa3dc | 4503 | } |
e9d25b98 DJ |
4504 | if (saw_general_regs) |
4505 | return 0; | |
4506 | else | |
4507 | return 1; | |
58caa3dc DJ |
4508 | } |
4509 | ||
1faeff08 | 4510 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4511 | |
1faeff08 | 4512 | #define use_linux_regsets 0 |
3aee8918 PA |
4513 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4514 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4515 | |
58caa3dc | 4516 | #endif |
1faeff08 MR |
4517 | |
4518 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4519 | calls or 0 if it has to be transferred individually. */ | |
4520 | ||
4521 | static int | |
3aee8918 | 4522 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4523 | { |
4524 | unsigned char mask = 1 << (regno % 8); | |
4525 | size_t index = regno / 8; | |
4526 | ||
4527 | return (use_linux_regsets | |
3aee8918 PA |
4528 | && (regs_info->regset_bitmap == NULL |
4529 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4530 | } |
4531 | ||
58caa3dc | 4532 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4533 | |
4534 | int | |
3aee8918 | 4535 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4536 | { |
4537 | int addr; | |
4538 | ||
3aee8918 | 4539 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4540 | error ("Invalid register number %d.", regnum); |
4541 | ||
3aee8918 | 4542 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4543 | |
4544 | return addr; | |
4545 | } | |
4546 | ||
4547 | /* Fetch one register. */ | |
4548 | static void | |
3aee8918 PA |
4549 | fetch_register (const struct usrregs_info *usrregs, |
4550 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4551 | { |
4552 | CORE_ADDR regaddr; | |
4553 | int i, size; | |
4554 | char *buf; | |
4555 | int pid; | |
4556 | ||
3aee8918 | 4557 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4558 | return; |
4559 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4560 | return; | |
4561 | ||
3aee8918 | 4562 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4563 | if (regaddr == -1) |
4564 | return; | |
4565 | ||
3aee8918 PA |
4566 | size = ((register_size (regcache->tdesc, regno) |
4567 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4568 | & -sizeof (PTRACE_XFER_TYPE)); |
4569 | buf = alloca (size); | |
4570 | ||
0bfdf32f | 4571 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4572 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4573 | { | |
4574 | errno = 0; | |
4575 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4576 | ptrace (PTRACE_PEEKUSER, pid, | |
4577 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4578 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4579 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4580 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4581 | if (errno != 0) | |
4582 | error ("reading register %d: %s", regno, strerror (errno)); | |
4583 | } | |
4584 | ||
4585 | if (the_low_target.supply_ptrace_register) | |
4586 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4587 | else | |
4588 | supply_register (regcache, regno, buf); | |
4589 | } | |
4590 | ||
4591 | /* Store one register. */ | |
4592 | static void | |
3aee8918 PA |
4593 | store_register (const struct usrregs_info *usrregs, |
4594 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4595 | { |
4596 | CORE_ADDR regaddr; | |
4597 | int i, size; | |
4598 | char *buf; | |
4599 | int pid; | |
4600 | ||
3aee8918 | 4601 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4602 | return; |
4603 | if ((*the_low_target.cannot_store_register) (regno)) | |
4604 | return; | |
4605 | ||
3aee8918 | 4606 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4607 | if (regaddr == -1) |
4608 | return; | |
4609 | ||
3aee8918 PA |
4610 | size = ((register_size (regcache->tdesc, regno) |
4611 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4612 | & -sizeof (PTRACE_XFER_TYPE)); |
4613 | buf = alloca (size); | |
4614 | memset (buf, 0, size); | |
4615 | ||
4616 | if (the_low_target.collect_ptrace_register) | |
4617 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4618 | else | |
4619 | collect_register (regcache, regno, buf); | |
4620 | ||
0bfdf32f | 4621 | pid = lwpid_of (current_thread); |
1faeff08 MR |
4622 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) |
4623 | { | |
4624 | errno = 0; | |
4625 | ptrace (PTRACE_POKEUSER, pid, | |
4626 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4627 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4628 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4629 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4630 | if (errno != 0) |
4631 | { | |
4632 | /* At this point, ESRCH should mean the process is | |
4633 | already gone, in which case we simply ignore attempts | |
4634 | to change its registers. See also the related | |
4635 | comment in linux_resume_one_lwp. */ | |
4636 | if (errno == ESRCH) | |
4637 | return; | |
4638 | ||
4639 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4640 | error ("writing register %d: %s", regno, strerror (errno)); | |
4641 | } | |
4642 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4643 | } | |
4644 | } | |
4645 | ||
4646 | /* Fetch all registers, or just one, from the child process. | |
4647 | If REGNO is -1, do this for all registers, skipping any that are | |
4648 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4649 | unless ALL is non-zero. | |
4650 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4651 | static void | |
3aee8918 PA |
4652 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4653 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4654 | { |
3aee8918 PA |
4655 | struct usrregs_info *usr = regs_info->usrregs; |
4656 | ||
1faeff08 MR |
4657 | if (regno == -1) |
4658 | { | |
3aee8918 PA |
4659 | for (regno = 0; regno < usr->num_regs; regno++) |
4660 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4661 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4662 | } |
4663 | else | |
3aee8918 | 4664 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4665 | } |
4666 | ||
4667 | /* Store our register values back into the inferior. | |
4668 | If REGNO is -1, do this for all registers, skipping any that are | |
4669 | assumed to have been saved by regsets_store_inferior_registers, | |
4670 | unless ALL is non-zero. | |
4671 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4672 | static void | |
3aee8918 PA |
4673 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4674 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4675 | { |
3aee8918 PA |
4676 | struct usrregs_info *usr = regs_info->usrregs; |
4677 | ||
1faeff08 MR |
4678 | if (regno == -1) |
4679 | { | |
3aee8918 PA |
4680 | for (regno = 0; regno < usr->num_regs; regno++) |
4681 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4682 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4683 | } |
4684 | else | |
3aee8918 | 4685 | store_register (usr, regcache, regno); |
1faeff08 MR |
4686 | } |
4687 | ||
4688 | #else /* !HAVE_LINUX_USRREGS */ | |
4689 | ||
3aee8918 PA |
4690 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4691 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4692 | |
58caa3dc | 4693 | #endif |
1faeff08 MR |
4694 | |
4695 | ||
4696 | void | |
4697 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4698 | { | |
4699 | int use_regsets; | |
4700 | int all = 0; | |
3aee8918 | 4701 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4702 | |
4703 | if (regno == -1) | |
4704 | { | |
3aee8918 PA |
4705 | if (the_low_target.fetch_register != NULL |
4706 | && regs_info->usrregs != NULL) | |
4707 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4708 | (*the_low_target.fetch_register) (regcache, regno); |
4709 | ||
3aee8918 PA |
4710 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4711 | if (regs_info->usrregs != NULL) | |
4712 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4713 | } |
4714 | else | |
4715 | { | |
c14dfd32 PA |
4716 | if (the_low_target.fetch_register != NULL |
4717 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4718 | return; | |
4719 | ||
3aee8918 | 4720 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4721 | if (use_regsets) |
3aee8918 PA |
4722 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4723 | regcache); | |
4724 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4725 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4726 | } |
58caa3dc DJ |
4727 | } |
4728 | ||
4729 | void | |
442ea881 | 4730 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4731 | { |
1faeff08 MR |
4732 | int use_regsets; |
4733 | int all = 0; | |
3aee8918 | 4734 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4735 | |
4736 | if (regno == -1) | |
4737 | { | |
3aee8918 PA |
4738 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4739 | regcache); | |
4740 | if (regs_info->usrregs != NULL) | |
4741 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4742 | } |
4743 | else | |
4744 | { | |
3aee8918 | 4745 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4746 | if (use_regsets) |
3aee8918 PA |
4747 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4748 | regcache); | |
4749 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4750 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4751 | } |
58caa3dc DJ |
4752 | } |
4753 | ||
da6d8c04 | 4754 | |
da6d8c04 DJ |
4755 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4756 | to debugger memory starting at MYADDR. */ | |
4757 | ||
c3e735a6 | 4758 | static int |
f450004a | 4759 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4760 | { |
0bfdf32f | 4761 | int pid = lwpid_of (current_thread); |
4934b29e MR |
4762 | register PTRACE_XFER_TYPE *buffer; |
4763 | register CORE_ADDR addr; | |
4764 | register int count; | |
4765 | char filename[64]; | |
da6d8c04 | 4766 | register int i; |
4934b29e | 4767 | int ret; |
fd462a61 | 4768 | int fd; |
fd462a61 DJ |
4769 | |
4770 | /* Try using /proc. Don't bother for one word. */ | |
4771 | if (len >= 3 * sizeof (long)) | |
4772 | { | |
4934b29e MR |
4773 | int bytes; |
4774 | ||
fd462a61 DJ |
4775 | /* We could keep this file open and cache it - possibly one per |
4776 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4777 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4778 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4779 | if (fd == -1) | |
4780 | goto no_proc; | |
4781 | ||
4782 | /* If pread64 is available, use it. It's faster if the kernel | |
4783 | supports it (only one syscall), and it's 64-bit safe even on | |
4784 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4785 | application). */ | |
4786 | #ifdef HAVE_PREAD64 | |
4934b29e | 4787 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4788 | #else |
4934b29e MR |
4789 | bytes = -1; |
4790 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4791 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4792 | #endif |
fd462a61 DJ |
4793 | |
4794 | close (fd); | |
4934b29e MR |
4795 | if (bytes == len) |
4796 | return 0; | |
4797 | ||
4798 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4799 | if (bytes > 0) | |
4800 | { | |
4801 | memaddr += bytes; | |
4802 | myaddr += bytes; | |
4803 | len -= bytes; | |
4804 | } | |
fd462a61 | 4805 | } |
da6d8c04 | 4806 | |
fd462a61 | 4807 | no_proc: |
4934b29e MR |
4808 | /* Round starting address down to longword boundary. */ |
4809 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4810 | /* Round ending address up; get number of longwords that makes. */ | |
4811 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4812 | / sizeof (PTRACE_XFER_TYPE)); | |
4813 | /* Allocate buffer of that many longwords. */ | |
4814 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4815 | ||
da6d8c04 | 4816 | /* Read all the longwords */ |
4934b29e | 4817 | errno = 0; |
da6d8c04 DJ |
4818 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4819 | { | |
14ce3065 DE |
4820 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4821 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4822 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4823 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4824 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4825 | if (errno) |
4934b29e | 4826 | break; |
da6d8c04 | 4827 | } |
4934b29e | 4828 | ret = errno; |
da6d8c04 DJ |
4829 | |
4830 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4831 | if (i > 0) |
4832 | { | |
4833 | i *= sizeof (PTRACE_XFER_TYPE); | |
4834 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4835 | memcpy (myaddr, | |
4836 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4837 | i < len ? i : len); | |
4838 | } | |
c3e735a6 | 4839 | |
4934b29e | 4840 | return ret; |
da6d8c04 DJ |
4841 | } |
4842 | ||
93ae6fdc PA |
4843 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4844 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4845 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4846 | |
ce3a066d | 4847 | static int |
f450004a | 4848 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4849 | { |
4850 | register int i; | |
4851 | /* Round starting address down to longword boundary. */ | |
4852 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4853 | /* Round ending address up; get number of longwords that makes. */ | |
4854 | register int count | |
493e2a69 MS |
4855 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4856 | / sizeof (PTRACE_XFER_TYPE); | |
4857 | ||
da6d8c04 | 4858 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4859 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4860 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4861 | ||
0bfdf32f | 4862 | int pid = lwpid_of (current_thread); |
da6d8c04 | 4863 | |
f0ae6fc3 PA |
4864 | if (len == 0) |
4865 | { | |
4866 | /* Zero length write always succeeds. */ | |
4867 | return 0; | |
4868 | } | |
4869 | ||
0d62e5e8 DJ |
4870 | if (debug_threads) |
4871 | { | |
58d6951d DJ |
4872 | /* Dump up to four bytes. */ |
4873 | unsigned int val = * (unsigned int *) myaddr; | |
4874 | if (len == 1) | |
4875 | val = val & 0xff; | |
4876 | else if (len == 2) | |
4877 | val = val & 0xffff; | |
4878 | else if (len == 3) | |
4879 | val = val & 0xffffff; | |
87ce2a04 DE |
4880 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4881 | val, (long)memaddr); | |
0d62e5e8 DJ |
4882 | } |
4883 | ||
da6d8c04 DJ |
4884 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4885 | ||
93ae6fdc | 4886 | errno = 0; |
14ce3065 DE |
4887 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4888 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4889 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4890 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4891 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4892 | if (errno) |
4893 | return errno; | |
da6d8c04 DJ |
4894 | |
4895 | if (count > 1) | |
4896 | { | |
93ae6fdc | 4897 | errno = 0; |
da6d8c04 | 4898 | buffer[count - 1] |
95954743 | 4899 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4900 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4901 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4902 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4903 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4904 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4905 | if (errno) |
4906 | return errno; | |
da6d8c04 DJ |
4907 | } |
4908 | ||
93ae6fdc | 4909 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4910 | |
493e2a69 MS |
4911 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4912 | myaddr, len); | |
da6d8c04 DJ |
4913 | |
4914 | /* Write the entire buffer. */ | |
4915 | ||
4916 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4917 | { | |
4918 | errno = 0; | |
14ce3065 DE |
4919 | ptrace (PTRACE_POKETEXT, pid, |
4920 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4921 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4922 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4923 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4924 | if (errno) |
4925 | return errno; | |
4926 | } | |
4927 | ||
4928 | return 0; | |
4929 | } | |
2f2893d9 DJ |
4930 | |
4931 | static void | |
4932 | linux_look_up_symbols (void) | |
4933 | { | |
0d62e5e8 | 4934 | #ifdef USE_THREAD_DB |
95954743 PA |
4935 | struct process_info *proc = current_process (); |
4936 | ||
fe978cb0 | 4937 | if (proc->priv->thread_db != NULL) |
0d62e5e8 DJ |
4938 | return; |
4939 | ||
96d7229d LM |
4940 | /* If the kernel supports tracing clones, then we don't need to |
4941 | use the magic thread event breakpoint to learn about | |
4942 | threads. */ | |
4943 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4944 | #endif |
4945 | } | |
4946 | ||
e5379b03 | 4947 | static void |
ef57601b | 4948 | linux_request_interrupt (void) |
e5379b03 | 4949 | { |
a1928bad | 4950 | extern unsigned long signal_pid; |
e5379b03 | 4951 | |
78708b7c PA |
4952 | /* Send a SIGINT to the process group. This acts just like the user |
4953 | typed a ^C on the controlling terminal. */ | |
4954 | kill (-signal_pid, SIGINT); | |
e5379b03 DJ |
4955 | } |
4956 | ||
aa691b87 RM |
4957 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4958 | to debugger memory starting at MYADDR. */ | |
4959 | ||
4960 | static int | |
f450004a | 4961 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4962 | { |
4963 | char filename[PATH_MAX]; | |
4964 | int fd, n; | |
0bfdf32f | 4965 | int pid = lwpid_of (current_thread); |
aa691b87 | 4966 | |
6cebaf6e | 4967 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4968 | |
4969 | fd = open (filename, O_RDONLY); | |
4970 | if (fd < 0) | |
4971 | return -1; | |
4972 | ||
4973 | if (offset != (CORE_ADDR) 0 | |
4974 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4975 | n = -1; | |
4976 | else | |
4977 | n = read (fd, myaddr, len); | |
4978 | ||
4979 | close (fd); | |
4980 | ||
4981 | return n; | |
4982 | } | |
4983 | ||
d993e290 PA |
4984 | /* These breakpoint and watchpoint related wrapper functions simply |
4985 | pass on the function call if the target has registered a | |
4986 | corresponding function. */ | |
e013ee27 OF |
4987 | |
4988 | static int | |
802e8e6d PA |
4989 | linux_supports_z_point_type (char z_type) |
4990 | { | |
4991 | return (the_low_target.supports_z_point_type != NULL | |
4992 | && the_low_target.supports_z_point_type (z_type)); | |
4993 | } | |
4994 | ||
4995 | static int | |
4996 | linux_insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
4997 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 4998 | { |
d993e290 | 4999 | if (the_low_target.insert_point != NULL) |
802e8e6d | 5000 | return the_low_target.insert_point (type, addr, size, bp); |
e013ee27 OF |
5001 | else |
5002 | /* Unsupported (see target.h). */ | |
5003 | return 1; | |
5004 | } | |
5005 | ||
5006 | static int | |
802e8e6d PA |
5007 | linux_remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
5008 | int size, struct raw_breakpoint *bp) | |
e013ee27 | 5009 | { |
d993e290 | 5010 | if (the_low_target.remove_point != NULL) |
802e8e6d | 5011 | return the_low_target.remove_point (type, addr, size, bp); |
e013ee27 OF |
5012 | else |
5013 | /* Unsupported (see target.h). */ | |
5014 | return 1; | |
5015 | } | |
5016 | ||
3e572f71 PA |
5017 | /* Implement the to_stopped_by_sw_breakpoint target_ops |
5018 | method. */ | |
5019 | ||
5020 | static int | |
5021 | linux_stopped_by_sw_breakpoint (void) | |
5022 | { | |
5023 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5024 | ||
5025 | return (lwp->stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT); | |
5026 | } | |
5027 | ||
5028 | /* Implement the to_supports_stopped_by_sw_breakpoint target_ops | |
5029 | method. */ | |
5030 | ||
5031 | static int | |
5032 | linux_supports_stopped_by_sw_breakpoint (void) | |
5033 | { | |
5034 | return USE_SIGTRAP_SIGINFO; | |
5035 | } | |
5036 | ||
5037 | /* Implement the to_stopped_by_hw_breakpoint target_ops | |
5038 | method. */ | |
5039 | ||
5040 | static int | |
5041 | linux_stopped_by_hw_breakpoint (void) | |
5042 | { | |
5043 | struct lwp_info *lwp = get_thread_lwp (current_thread); | |
5044 | ||
5045 | return (lwp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT); | |
5046 | } | |
5047 | ||
5048 | /* Implement the to_supports_stopped_by_hw_breakpoint target_ops | |
5049 | method. */ | |
5050 | ||
5051 | static int | |
5052 | linux_supports_stopped_by_hw_breakpoint (void) | |
5053 | { | |
5054 | return USE_SIGTRAP_SIGINFO; | |
5055 | } | |
5056 | ||
e013ee27 OF |
5057 | static int |
5058 | linux_stopped_by_watchpoint (void) | |
5059 | { | |
0bfdf32f | 5060 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c | 5061 | |
15c66dd6 | 5062 | return lwp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT; |
e013ee27 OF |
5063 | } |
5064 | ||
5065 | static CORE_ADDR | |
5066 | linux_stopped_data_address (void) | |
5067 | { | |
0bfdf32f | 5068 | struct lwp_info *lwp = get_thread_lwp (current_thread); |
c3adc08c PA |
5069 | |
5070 | return lwp->stopped_data_address; | |
e013ee27 OF |
5071 | } |
5072 | ||
db0dfaa0 LM |
5073 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5074 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5075 | && defined(PT_TEXT_END_ADDR) | |
5076 | ||
5077 | /* This is only used for targets that define PT_TEXT_ADDR, | |
5078 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
5079 | the target has different ways of acquiring this information, like | |
5080 | loadmaps. */ | |
52fb6437 NS |
5081 | |
5082 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
5083 | to tell gdb about. */ | |
5084 | ||
5085 | static int | |
5086 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
5087 | { | |
52fb6437 | 5088 | unsigned long text, text_end, data; |
0bfdf32f | 5089 | int pid = lwpid_of (get_thread_lwp (current_thread)); |
52fb6437 NS |
5090 | |
5091 | errno = 0; | |
5092 | ||
b8e1b30e LM |
5093 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
5094 | (PTRACE_TYPE_ARG4) 0); | |
5095 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
5096 | (PTRACE_TYPE_ARG4) 0); | |
5097 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
5098 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
5099 | |
5100 | if (errno == 0) | |
5101 | { | |
5102 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
5103 | used by gdb) are relative to the beginning of the program, |
5104 | with the data segment immediately following the text segment. | |
5105 | However, the actual runtime layout in memory may put the data | |
5106 | somewhere else, so when we send gdb a data base-address, we | |
5107 | use the real data base address and subtract the compile-time | |
5108 | data base-address from it (which is just the length of the | |
5109 | text segment). BSS immediately follows data in both | |
5110 | cases. */ | |
52fb6437 NS |
5111 | *text_p = text; |
5112 | *data_p = data - (text_end - text); | |
1b3f6016 | 5113 | |
52fb6437 NS |
5114 | return 1; |
5115 | } | |
52fb6437 NS |
5116 | return 0; |
5117 | } | |
5118 | #endif | |
5119 | ||
07e059b5 VP |
5120 | static int |
5121 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
5122 | unsigned char *readbuf, unsigned const char *writebuf, |
5123 | CORE_ADDR offset, int len) | |
07e059b5 | 5124 | { |
d26e3629 | 5125 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5126 | } |
5127 | ||
d0722149 DE |
5128 | /* Convert a native/host siginfo object, into/from the siginfo in the |
5129 | layout of the inferiors' architecture. */ | |
5130 | ||
5131 | static void | |
a5362b9a | 5132 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
5133 | { |
5134 | int done = 0; | |
5135 | ||
5136 | if (the_low_target.siginfo_fixup != NULL) | |
5137 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
5138 | ||
5139 | /* If there was no callback, or the callback didn't do anything, | |
5140 | then just do a straight memcpy. */ | |
5141 | if (!done) | |
5142 | { | |
5143 | if (direction == 1) | |
a5362b9a | 5144 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 5145 | else |
a5362b9a | 5146 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
5147 | } |
5148 | } | |
5149 | ||
4aa995e1 PA |
5150 | static int |
5151 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
5152 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
5153 | { | |
d0722149 | 5154 | int pid; |
a5362b9a TS |
5155 | siginfo_t siginfo; |
5156 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 | 5157 | |
0bfdf32f | 5158 | if (current_thread == NULL) |
4aa995e1 PA |
5159 | return -1; |
5160 | ||
0bfdf32f | 5161 | pid = lwpid_of (current_thread); |
4aa995e1 PA |
5162 | |
5163 | if (debug_threads) | |
87ce2a04 DE |
5164 | debug_printf ("%s siginfo for lwp %d.\n", |
5165 | readbuf != NULL ? "Reading" : "Writing", | |
5166 | pid); | |
4aa995e1 | 5167 | |
0adea5f7 | 5168 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
5169 | return -1; |
5170 | ||
b8e1b30e | 5171 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5172 | return -1; |
5173 | ||
d0722149 DE |
5174 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
5175 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
5176 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
5177 | with a 32-bit GDBSERVER, we need to convert it. */ | |
5178 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
5179 | ||
4aa995e1 PA |
5180 | if (offset + len > sizeof (siginfo)) |
5181 | len = sizeof (siginfo) - offset; | |
5182 | ||
5183 | if (readbuf != NULL) | |
d0722149 | 5184 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
5185 | else |
5186 | { | |
d0722149 DE |
5187 | memcpy (inf_siginfo + offset, writebuf, len); |
5188 | ||
5189 | /* Convert back to ptrace layout before flushing it out. */ | |
5190 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
5191 | ||
b8e1b30e | 5192 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
5193 | return -1; |
5194 | } | |
5195 | ||
5196 | return len; | |
5197 | } | |
5198 | ||
bd99dc85 PA |
5199 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5200 | so we notice when children change state; as the handler for the | |
5201 | sigsuspend in my_waitpid. */ | |
5202 | ||
5203 | static void | |
5204 | sigchld_handler (int signo) | |
5205 | { | |
5206 | int old_errno = errno; | |
5207 | ||
5208 | if (debug_threads) | |
e581f2b4 PA |
5209 | { |
5210 | do | |
5211 | { | |
5212 | /* fprintf is not async-signal-safe, so call write | |
5213 | directly. */ | |
5214 | if (write (2, "sigchld_handler\n", | |
5215 | sizeof ("sigchld_handler\n") - 1) < 0) | |
5216 | break; /* just ignore */ | |
5217 | } while (0); | |
5218 | } | |
bd99dc85 PA |
5219 | |
5220 | if (target_is_async_p ()) | |
5221 | async_file_mark (); /* trigger a linux_wait */ | |
5222 | ||
5223 | errno = old_errno; | |
5224 | } | |
5225 | ||
5226 | static int | |
5227 | linux_supports_non_stop (void) | |
5228 | { | |
5229 | return 1; | |
5230 | } | |
5231 | ||
5232 | static int | |
5233 | linux_async (int enable) | |
5234 | { | |
7089dca4 | 5235 | int previous = target_is_async_p (); |
bd99dc85 | 5236 | |
8336d594 | 5237 | if (debug_threads) |
87ce2a04 DE |
5238 | debug_printf ("linux_async (%d), previous=%d\n", |
5239 | enable, previous); | |
8336d594 | 5240 | |
bd99dc85 PA |
5241 | if (previous != enable) |
5242 | { | |
5243 | sigset_t mask; | |
5244 | sigemptyset (&mask); | |
5245 | sigaddset (&mask, SIGCHLD); | |
5246 | ||
5247 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
5248 | ||
5249 | if (enable) | |
5250 | { | |
5251 | if (pipe (linux_event_pipe) == -1) | |
aa96c426 GB |
5252 | { |
5253 | linux_event_pipe[0] = -1; | |
5254 | linux_event_pipe[1] = -1; | |
5255 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5256 | ||
5257 | warning ("creating event pipe failed."); | |
5258 | return previous; | |
5259 | } | |
bd99dc85 PA |
5260 | |
5261 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5262 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5263 | ||
5264 | /* Register the event loop handler. */ | |
5265 | add_file_handler (linux_event_pipe[0], | |
5266 | handle_target_event, NULL); | |
5267 | ||
5268 | /* Always trigger a linux_wait. */ | |
5269 | async_file_mark (); | |
5270 | } | |
5271 | else | |
5272 | { | |
5273 | delete_file_handler (linux_event_pipe[0]); | |
5274 | ||
5275 | close (linux_event_pipe[0]); | |
5276 | close (linux_event_pipe[1]); | |
5277 | linux_event_pipe[0] = -1; | |
5278 | linux_event_pipe[1] = -1; | |
5279 | } | |
5280 | ||
5281 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
5282 | } | |
5283 | ||
5284 | return previous; | |
5285 | } | |
5286 | ||
5287 | static int | |
5288 | linux_start_non_stop (int nonstop) | |
5289 | { | |
5290 | /* Register or unregister from event-loop accordingly. */ | |
5291 | linux_async (nonstop); | |
aa96c426 GB |
5292 | |
5293 | if (target_is_async_p () != (nonstop != 0)) | |
5294 | return -1; | |
5295 | ||
bd99dc85 PA |
5296 | return 0; |
5297 | } | |
5298 | ||
cf8fd78b PA |
5299 | static int |
5300 | linux_supports_multi_process (void) | |
5301 | { | |
5302 | return 1; | |
5303 | } | |
5304 | ||
03583c20 UW |
5305 | static int |
5306 | linux_supports_disable_randomization (void) | |
5307 | { | |
5308 | #ifdef HAVE_PERSONALITY | |
5309 | return 1; | |
5310 | #else | |
5311 | return 0; | |
5312 | #endif | |
5313 | } | |
efcbbd14 | 5314 | |
d1feda86 YQ |
5315 | static int |
5316 | linux_supports_agent (void) | |
5317 | { | |
5318 | return 1; | |
5319 | } | |
5320 | ||
c2d6af84 PA |
5321 | static int |
5322 | linux_supports_range_stepping (void) | |
5323 | { | |
5324 | if (*the_low_target.supports_range_stepping == NULL) | |
5325 | return 0; | |
5326 | ||
5327 | return (*the_low_target.supports_range_stepping) (); | |
5328 | } | |
5329 | ||
efcbbd14 UW |
5330 | /* Enumerate spufs IDs for process PID. */ |
5331 | static int | |
5332 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
5333 | { | |
5334 | int pos = 0; | |
5335 | int written = 0; | |
5336 | char path[128]; | |
5337 | DIR *dir; | |
5338 | struct dirent *entry; | |
5339 | ||
5340 | sprintf (path, "/proc/%ld/fd", pid); | |
5341 | dir = opendir (path); | |
5342 | if (!dir) | |
5343 | return -1; | |
5344 | ||
5345 | rewinddir (dir); | |
5346 | while ((entry = readdir (dir)) != NULL) | |
5347 | { | |
5348 | struct stat st; | |
5349 | struct statfs stfs; | |
5350 | int fd; | |
5351 | ||
5352 | fd = atoi (entry->d_name); | |
5353 | if (!fd) | |
5354 | continue; | |
5355 | ||
5356 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
5357 | if (stat (path, &st) != 0) | |
5358 | continue; | |
5359 | if (!S_ISDIR (st.st_mode)) | |
5360 | continue; | |
5361 | ||
5362 | if (statfs (path, &stfs) != 0) | |
5363 | continue; | |
5364 | if (stfs.f_type != SPUFS_MAGIC) | |
5365 | continue; | |
5366 | ||
5367 | if (pos >= offset && pos + 4 <= offset + len) | |
5368 | { | |
5369 | *(unsigned int *)(buf + pos - offset) = fd; | |
5370 | written += 4; | |
5371 | } | |
5372 | pos += 4; | |
5373 | } | |
5374 | ||
5375 | closedir (dir); | |
5376 | return written; | |
5377 | } | |
5378 | ||
5379 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5380 | object type, using the /proc file system. */ | |
5381 | static int | |
5382 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5383 | unsigned const char *writebuf, | |
5384 | CORE_ADDR offset, int len) | |
5385 | { | |
0bfdf32f | 5386 | long pid = lwpid_of (current_thread); |
efcbbd14 UW |
5387 | char buf[128]; |
5388 | int fd = 0; | |
5389 | int ret = 0; | |
5390 | ||
5391 | if (!writebuf && !readbuf) | |
5392 | return -1; | |
5393 | ||
5394 | if (!*annex) | |
5395 | { | |
5396 | if (!readbuf) | |
5397 | return -1; | |
5398 | else | |
5399 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5400 | } | |
5401 | ||
5402 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5403 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5404 | if (fd <= 0) | |
5405 | return -1; | |
5406 | ||
5407 | if (offset != 0 | |
5408 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5409 | { | |
5410 | close (fd); | |
5411 | return 0; | |
5412 | } | |
5413 | ||
5414 | if (writebuf) | |
5415 | ret = write (fd, writebuf, (size_t) len); | |
5416 | else | |
5417 | ret = read (fd, readbuf, (size_t) len); | |
5418 | ||
5419 | close (fd); | |
5420 | return ret; | |
5421 | } | |
5422 | ||
723b724b | 5423 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5424 | struct target_loadseg |
5425 | { | |
5426 | /* Core address to which the segment is mapped. */ | |
5427 | Elf32_Addr addr; | |
5428 | /* VMA recorded in the program header. */ | |
5429 | Elf32_Addr p_vaddr; | |
5430 | /* Size of this segment in memory. */ | |
5431 | Elf32_Word p_memsz; | |
5432 | }; | |
5433 | ||
723b724b | 5434 | # if defined PT_GETDSBT |
78d85199 YQ |
5435 | struct target_loadmap |
5436 | { | |
5437 | /* Protocol version number, must be zero. */ | |
5438 | Elf32_Word version; | |
5439 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5440 | unsigned *dsbt_table; | |
5441 | unsigned dsbt_size, dsbt_index; | |
5442 | /* Number of segments in this map. */ | |
5443 | Elf32_Word nsegs; | |
5444 | /* The actual memory map. */ | |
5445 | struct target_loadseg segs[/*nsegs*/]; | |
5446 | }; | |
723b724b MF |
5447 | # define LINUX_LOADMAP PT_GETDSBT |
5448 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5449 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5450 | # else | |
5451 | struct target_loadmap | |
5452 | { | |
5453 | /* Protocol version number, must be zero. */ | |
5454 | Elf32_Half version; | |
5455 | /* Number of segments in this map. */ | |
5456 | Elf32_Half nsegs; | |
5457 | /* The actual memory map. */ | |
5458 | struct target_loadseg segs[/*nsegs*/]; | |
5459 | }; | |
5460 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5461 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5462 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5463 | # endif | |
78d85199 | 5464 | |
78d85199 YQ |
5465 | static int |
5466 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5467 | unsigned char *myaddr, unsigned int len) | |
5468 | { | |
0bfdf32f | 5469 | int pid = lwpid_of (current_thread); |
78d85199 YQ |
5470 | int addr = -1; |
5471 | struct target_loadmap *data = NULL; | |
5472 | unsigned int actual_length, copy_length; | |
5473 | ||
5474 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5475 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5476 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5477 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5478 | else |
5479 | return -1; | |
5480 | ||
723b724b | 5481 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5482 | return -1; |
5483 | ||
5484 | if (data == NULL) | |
5485 | return -1; | |
5486 | ||
5487 | actual_length = sizeof (struct target_loadmap) | |
5488 | + sizeof (struct target_loadseg) * data->nsegs; | |
5489 | ||
5490 | if (offset < 0 || offset > actual_length) | |
5491 | return -1; | |
5492 | ||
5493 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5494 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5495 | return copy_length; | |
5496 | } | |
723b724b MF |
5497 | #else |
5498 | # define linux_read_loadmap NULL | |
5499 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5500 | |
1570b33e L |
5501 | static void |
5502 | linux_process_qsupported (const char *query) | |
5503 | { | |
5504 | if (the_low_target.process_qsupported != NULL) | |
5505 | the_low_target.process_qsupported (query); | |
5506 | } | |
5507 | ||
219f2f23 PA |
5508 | static int |
5509 | linux_supports_tracepoints (void) | |
5510 | { | |
5511 | if (*the_low_target.supports_tracepoints == NULL) | |
5512 | return 0; | |
5513 | ||
5514 | return (*the_low_target.supports_tracepoints) (); | |
5515 | } | |
5516 | ||
5517 | static CORE_ADDR | |
5518 | linux_read_pc (struct regcache *regcache) | |
5519 | { | |
5520 | if (the_low_target.get_pc == NULL) | |
5521 | return 0; | |
5522 | ||
5523 | return (*the_low_target.get_pc) (regcache); | |
5524 | } | |
5525 | ||
5526 | static void | |
5527 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5528 | { | |
5529 | gdb_assert (the_low_target.set_pc != NULL); | |
5530 | ||
5531 | (*the_low_target.set_pc) (regcache, pc); | |
5532 | } | |
5533 | ||
8336d594 PA |
5534 | static int |
5535 | linux_thread_stopped (struct thread_info *thread) | |
5536 | { | |
5537 | return get_thread_lwp (thread)->stopped; | |
5538 | } | |
5539 | ||
5540 | /* This exposes stop-all-threads functionality to other modules. */ | |
5541 | ||
5542 | static void | |
7984d532 | 5543 | linux_pause_all (int freeze) |
8336d594 | 5544 | { |
7984d532 PA |
5545 | stop_all_lwps (freeze, NULL); |
5546 | } | |
5547 | ||
5548 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5549 | modules. */ | |
5550 | ||
5551 | static void | |
5552 | linux_unpause_all (int unfreeze) | |
5553 | { | |
5554 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5555 | } |
5556 | ||
90d74c30 PA |
5557 | static int |
5558 | linux_prepare_to_access_memory (void) | |
5559 | { | |
5560 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5561 | running LWP. */ | |
5562 | if (non_stop) | |
5563 | linux_pause_all (1); | |
5564 | return 0; | |
5565 | } | |
5566 | ||
5567 | static void | |
0146f85b | 5568 | linux_done_accessing_memory (void) |
90d74c30 PA |
5569 | { |
5570 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5571 | running LWP. */ | |
5572 | if (non_stop) | |
5573 | linux_unpause_all (1); | |
5574 | } | |
5575 | ||
fa593d66 PA |
5576 | static int |
5577 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5578 | CORE_ADDR collector, | |
5579 | CORE_ADDR lockaddr, | |
5580 | ULONGEST orig_size, | |
5581 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5582 | CORE_ADDR *trampoline, |
5583 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5584 | unsigned char *jjump_pad_insn, |
5585 | ULONGEST *jjump_pad_insn_size, | |
5586 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5587 | CORE_ADDR *adjusted_insn_addr_end, |
5588 | char *err) | |
fa593d66 PA |
5589 | { |
5590 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5591 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5592 | jump_entry, trampoline, trampoline_size, |
5593 | jjump_pad_insn, jjump_pad_insn_size, | |
5594 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5595 | err); | |
fa593d66 PA |
5596 | } |
5597 | ||
6a271cae PA |
5598 | static struct emit_ops * |
5599 | linux_emit_ops (void) | |
5600 | { | |
5601 | if (the_low_target.emit_ops != NULL) | |
5602 | return (*the_low_target.emit_ops) (); | |
5603 | else | |
5604 | return NULL; | |
5605 | } | |
5606 | ||
405f8e94 SS |
5607 | static int |
5608 | linux_get_min_fast_tracepoint_insn_len (void) | |
5609 | { | |
5610 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5611 | } | |
5612 | ||
2268b414 JK |
5613 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5614 | ||
5615 | static int | |
5616 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5617 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5618 | { | |
5619 | char filename[PATH_MAX]; | |
5620 | int fd; | |
5621 | const int auxv_size = is_elf64 | |
5622 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5623 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5624 | ||
5625 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5626 | ||
5627 | fd = open (filename, O_RDONLY); | |
5628 | if (fd < 0) | |
5629 | return 1; | |
5630 | ||
5631 | *phdr_memaddr = 0; | |
5632 | *num_phdr = 0; | |
5633 | while (read (fd, buf, auxv_size) == auxv_size | |
5634 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5635 | { | |
5636 | if (is_elf64) | |
5637 | { | |
5638 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5639 | ||
5640 | switch (aux->a_type) | |
5641 | { | |
5642 | case AT_PHDR: | |
5643 | *phdr_memaddr = aux->a_un.a_val; | |
5644 | break; | |
5645 | case AT_PHNUM: | |
5646 | *num_phdr = aux->a_un.a_val; | |
5647 | break; | |
5648 | } | |
5649 | } | |
5650 | else | |
5651 | { | |
5652 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5653 | ||
5654 | switch (aux->a_type) | |
5655 | { | |
5656 | case AT_PHDR: | |
5657 | *phdr_memaddr = aux->a_un.a_val; | |
5658 | break; | |
5659 | case AT_PHNUM: | |
5660 | *num_phdr = aux->a_un.a_val; | |
5661 | break; | |
5662 | } | |
5663 | } | |
5664 | } | |
5665 | ||
5666 | close (fd); | |
5667 | ||
5668 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5669 | { | |
5670 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5671 | "phdr_memaddr = %ld, phdr_num = %d", | |
5672 | (long) *phdr_memaddr, *num_phdr); | |
5673 | return 2; | |
5674 | } | |
5675 | ||
5676 | return 0; | |
5677 | } | |
5678 | ||
5679 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5680 | ||
5681 | static CORE_ADDR | |
5682 | get_dynamic (const int pid, const int is_elf64) | |
5683 | { | |
5684 | CORE_ADDR phdr_memaddr, relocation; | |
5685 | int num_phdr, i; | |
5686 | unsigned char *phdr_buf; | |
5687 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5688 | ||
5689 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5690 | return 0; | |
5691 | ||
5692 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5693 | phdr_buf = alloca (num_phdr * phdr_size); | |
5694 | ||
5695 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5696 | return 0; | |
5697 | ||
5698 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5699 | non-zero for PIE ones. */ | |
5700 | relocation = -1; | |
5701 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5702 | if (is_elf64) | |
5703 | { | |
5704 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5705 | ||
5706 | if (p->p_type == PT_PHDR) | |
5707 | relocation = phdr_memaddr - p->p_vaddr; | |
5708 | } | |
5709 | else | |
5710 | { | |
5711 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5712 | ||
5713 | if (p->p_type == PT_PHDR) | |
5714 | relocation = phdr_memaddr - p->p_vaddr; | |
5715 | } | |
5716 | ||
5717 | if (relocation == -1) | |
5718 | { | |
e237a7e2 JK |
5719 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5720 | any real world executables, including PIE executables, have always | |
5721 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5722 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5723 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5724 | ||
5725 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5726 | ||
5727 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5728 | ||
2268b414 JK |
5729 | return 0; |
5730 | } | |
5731 | ||
5732 | for (i = 0; i < num_phdr; i++) | |
5733 | { | |
5734 | if (is_elf64) | |
5735 | { | |
5736 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5737 | ||
5738 | if (p->p_type == PT_DYNAMIC) | |
5739 | return p->p_vaddr + relocation; | |
5740 | } | |
5741 | else | |
5742 | { | |
5743 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5744 | ||
5745 | if (p->p_type == PT_DYNAMIC) | |
5746 | return p->p_vaddr + relocation; | |
5747 | } | |
5748 | } | |
5749 | ||
5750 | return 0; | |
5751 | } | |
5752 | ||
5753 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5754 | can be 0 if the inferior does not yet have the library list initialized. |
5755 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5756 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5757 | |
5758 | static CORE_ADDR | |
5759 | get_r_debug (const int pid, const int is_elf64) | |
5760 | { | |
5761 | CORE_ADDR dynamic_memaddr; | |
5762 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5763 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5764 | CORE_ADDR map = -1; |
2268b414 JK |
5765 | |
5766 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5767 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5768 | return map; |
2268b414 JK |
5769 | |
5770 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5771 | { | |
5772 | if (is_elf64) | |
5773 | { | |
5774 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5775 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5776 | union |
5777 | { | |
5778 | Elf64_Xword map; | |
5779 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5780 | } | |
5781 | rld_map; | |
5782 | ||
5783 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5784 | { | |
5785 | if (linux_read_memory (dyn->d_un.d_val, | |
5786 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5787 | return rld_map.map; | |
5788 | else | |
5789 | break; | |
5790 | } | |
75f62ce7 | 5791 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5792 | |
367ba2c2 MR |
5793 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5794 | map = dyn->d_un.d_val; | |
2268b414 JK |
5795 | |
5796 | if (dyn->d_tag == DT_NULL) | |
5797 | break; | |
5798 | } | |
5799 | else | |
5800 | { | |
5801 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5802 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5803 | union |
5804 | { | |
5805 | Elf32_Word map; | |
5806 | unsigned char buf[sizeof (Elf32_Word)]; | |
5807 | } | |
5808 | rld_map; | |
5809 | ||
5810 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5811 | { | |
5812 | if (linux_read_memory (dyn->d_un.d_val, | |
5813 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5814 | return rld_map.map; | |
5815 | else | |
5816 | break; | |
5817 | } | |
75f62ce7 | 5818 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5819 | |
367ba2c2 MR |
5820 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5821 | map = dyn->d_un.d_val; | |
2268b414 JK |
5822 | |
5823 | if (dyn->d_tag == DT_NULL) | |
5824 | break; | |
5825 | } | |
5826 | ||
5827 | dynamic_memaddr += dyn_size; | |
5828 | } | |
5829 | ||
367ba2c2 | 5830 | return map; |
2268b414 JK |
5831 | } |
5832 | ||
5833 | /* Read one pointer from MEMADDR in the inferior. */ | |
5834 | ||
5835 | static int | |
5836 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5837 | { | |
485f1ee4 PA |
5838 | int ret; |
5839 | ||
5840 | /* Go through a union so this works on either big or little endian | |
5841 | hosts, when the inferior's pointer size is smaller than the size | |
5842 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5843 | same of the superior's. */ | |
5844 | union | |
5845 | { | |
5846 | CORE_ADDR core_addr; | |
5847 | unsigned int ui; | |
5848 | unsigned char uc; | |
5849 | } addr; | |
5850 | ||
5851 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5852 | if (ret == 0) | |
5853 | { | |
5854 | if (ptr_size == sizeof (CORE_ADDR)) | |
5855 | *ptr = addr.core_addr; | |
5856 | else if (ptr_size == sizeof (unsigned int)) | |
5857 | *ptr = addr.ui; | |
5858 | else | |
5859 | gdb_assert_not_reached ("unhandled pointer size"); | |
5860 | } | |
5861 | return ret; | |
2268b414 JK |
5862 | } |
5863 | ||
5864 | struct link_map_offsets | |
5865 | { | |
5866 | /* Offset and size of r_debug.r_version. */ | |
5867 | int r_version_offset; | |
5868 | ||
5869 | /* Offset and size of r_debug.r_map. */ | |
5870 | int r_map_offset; | |
5871 | ||
5872 | /* Offset to l_addr field in struct link_map. */ | |
5873 | int l_addr_offset; | |
5874 | ||
5875 | /* Offset to l_name field in struct link_map. */ | |
5876 | int l_name_offset; | |
5877 | ||
5878 | /* Offset to l_ld field in struct link_map. */ | |
5879 | int l_ld_offset; | |
5880 | ||
5881 | /* Offset to l_next field in struct link_map. */ | |
5882 | int l_next_offset; | |
5883 | ||
5884 | /* Offset to l_prev field in struct link_map. */ | |
5885 | int l_prev_offset; | |
5886 | }; | |
5887 | ||
fb723180 | 5888 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5889 | |
5890 | static int | |
5891 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5892 | unsigned const char *writebuf, | |
5893 | CORE_ADDR offset, int len) | |
5894 | { | |
5895 | char *document; | |
5896 | unsigned document_len; | |
fe978cb0 | 5897 | struct process_info_private *const priv = current_process ()->priv; |
2268b414 JK |
5898 | char filename[PATH_MAX]; |
5899 | int pid, is_elf64; | |
5900 | ||
5901 | static const struct link_map_offsets lmo_32bit_offsets = | |
5902 | { | |
5903 | 0, /* r_version offset. */ | |
5904 | 4, /* r_debug.r_map offset. */ | |
5905 | 0, /* l_addr offset in link_map. */ | |
5906 | 4, /* l_name offset in link_map. */ | |
5907 | 8, /* l_ld offset in link_map. */ | |
5908 | 12, /* l_next offset in link_map. */ | |
5909 | 16 /* l_prev offset in link_map. */ | |
5910 | }; | |
5911 | ||
5912 | static const struct link_map_offsets lmo_64bit_offsets = | |
5913 | { | |
5914 | 0, /* r_version offset. */ | |
5915 | 8, /* r_debug.r_map offset. */ | |
5916 | 0, /* l_addr offset in link_map. */ | |
5917 | 8, /* l_name offset in link_map. */ | |
5918 | 16, /* l_ld offset in link_map. */ | |
5919 | 24, /* l_next offset in link_map. */ | |
5920 | 32 /* l_prev offset in link_map. */ | |
5921 | }; | |
5922 | const struct link_map_offsets *lmo; | |
214d508e | 5923 | unsigned int machine; |
b1fbec62 GB |
5924 | int ptr_size; |
5925 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5926 | int allocated = 1024; | |
5927 | char *p; | |
5928 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5929 | int header_done = 0; | |
2268b414 JK |
5930 | |
5931 | if (writebuf != NULL) | |
5932 | return -2; | |
5933 | if (readbuf == NULL) | |
5934 | return -1; | |
5935 | ||
0bfdf32f | 5936 | pid = lwpid_of (current_thread); |
2268b414 | 5937 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); |
214d508e | 5938 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5939 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5940 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5941 | |
b1fbec62 GB |
5942 | while (annex[0] != '\0') |
5943 | { | |
5944 | const char *sep; | |
5945 | CORE_ADDR *addrp; | |
5946 | int len; | |
2268b414 | 5947 | |
b1fbec62 GB |
5948 | sep = strchr (annex, '='); |
5949 | if (sep == NULL) | |
5950 | break; | |
0c5bf5a9 | 5951 | |
b1fbec62 | 5952 | len = sep - annex; |
61012eef | 5953 | if (len == 5 && startswith (annex, "start")) |
b1fbec62 | 5954 | addrp = &lm_addr; |
61012eef | 5955 | else if (len == 4 && startswith (annex, "prev")) |
b1fbec62 GB |
5956 | addrp = &lm_prev; |
5957 | else | |
5958 | { | |
5959 | annex = strchr (sep, ';'); | |
5960 | if (annex == NULL) | |
5961 | break; | |
5962 | annex++; | |
5963 | continue; | |
5964 | } | |
5965 | ||
5966 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5967 | } |
b1fbec62 GB |
5968 | |
5969 | if (lm_addr == 0) | |
2268b414 | 5970 | { |
b1fbec62 GB |
5971 | int r_version = 0; |
5972 | ||
5973 | if (priv->r_debug == 0) | |
5974 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5975 | ||
5976 | /* We failed to find DT_DEBUG. Such situation will not change | |
5977 | for this inferior - do not retry it. Report it to GDB as | |
5978 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5979 | if (priv->r_debug == (CORE_ADDR) -1) | |
5980 | return -1; | |
5981 | ||
5982 | if (priv->r_debug != 0) | |
2268b414 | 5983 | { |
b1fbec62 GB |
5984 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5985 | (unsigned char *) &r_version, | |
5986 | sizeof (r_version)) != 0 | |
5987 | || r_version != 1) | |
5988 | { | |
5989 | warning ("unexpected r_debug version %d", r_version); | |
5990 | } | |
5991 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5992 | &lm_addr, ptr_size) != 0) | |
5993 | { | |
5994 | warning ("unable to read r_map from 0x%lx", | |
5995 | (long) priv->r_debug + lmo->r_map_offset); | |
5996 | } | |
2268b414 | 5997 | } |
b1fbec62 | 5998 | } |
2268b414 | 5999 | |
b1fbec62 GB |
6000 | document = xmalloc (allocated); |
6001 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
6002 | p = document + strlen (document); | |
6003 | ||
6004 | while (lm_addr | |
6005 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
6006 | &l_name, ptr_size) == 0 | |
6007 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
6008 | &l_addr, ptr_size) == 0 | |
6009 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
6010 | &l_ld, ptr_size) == 0 | |
6011 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
6012 | &l_prev, ptr_size) == 0 | |
6013 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
6014 | &l_next, ptr_size) == 0) | |
6015 | { | |
6016 | unsigned char libname[PATH_MAX]; | |
6017 | ||
6018 | if (lm_prev != l_prev) | |
2268b414 | 6019 | { |
b1fbec62 GB |
6020 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
6021 | (long) lm_prev, (long) l_prev); | |
6022 | break; | |
2268b414 JK |
6023 | } |
6024 | ||
d878444c JK |
6025 | /* Ignore the first entry even if it has valid name as the first entry |
6026 | corresponds to the main executable. The first entry should not be | |
6027 | skipped if the dynamic loader was loaded late by a static executable | |
6028 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
6029 | executable does not have PT_DYNAMIC present and this function already | |
6030 | exited above due to failed get_r_debug. */ | |
6031 | if (lm_prev == 0) | |
2268b414 | 6032 | { |
d878444c JK |
6033 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
6034 | p = p + strlen (p); | |
6035 | } | |
6036 | else | |
6037 | { | |
6038 | /* Not checking for error because reading may stop before | |
6039 | we've got PATH_MAX worth of characters. */ | |
6040 | libname[0] = '\0'; | |
6041 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
6042 | libname[sizeof (libname) - 1] = '\0'; | |
6043 | if (libname[0] != '\0') | |
2268b414 | 6044 | { |
d878444c JK |
6045 | /* 6x the size for xml_escape_text below. */ |
6046 | size_t len = 6 * strlen ((char *) libname); | |
6047 | char *name; | |
2268b414 | 6048 | |
d878444c JK |
6049 | if (!header_done) |
6050 | { | |
6051 | /* Terminate `<library-list-svr4'. */ | |
6052 | *p++ = '>'; | |
6053 | header_done = 1; | |
6054 | } | |
2268b414 | 6055 | |
d878444c JK |
6056 | while (allocated < p - document + len + 200) |
6057 | { | |
6058 | /* Expand to guarantee sufficient storage. */ | |
6059 | uintptr_t document_len = p - document; | |
2268b414 | 6060 | |
d878444c JK |
6061 | document = xrealloc (document, 2 * allocated); |
6062 | allocated *= 2; | |
6063 | p = document + document_len; | |
6064 | } | |
6065 | ||
6066 | name = xml_escape_text ((char *) libname); | |
6067 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
6068 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
6069 | name, (unsigned long) lm_addr, | |
6070 | (unsigned long) l_addr, (unsigned long) l_ld); | |
6071 | free (name); | |
6072 | } | |
0afae3cf | 6073 | } |
b1fbec62 GB |
6074 | |
6075 | lm_prev = lm_addr; | |
6076 | lm_addr = l_next; | |
2268b414 JK |
6077 | } |
6078 | ||
b1fbec62 GB |
6079 | if (!header_done) |
6080 | { | |
6081 | /* Empty list; terminate `<library-list-svr4'. */ | |
6082 | strcpy (p, "/>"); | |
6083 | } | |
6084 | else | |
6085 | strcpy (p, "</library-list-svr4>"); | |
6086 | ||
2268b414 JK |
6087 | document_len = strlen (document); |
6088 | if (offset < document_len) | |
6089 | document_len -= offset; | |
6090 | else | |
6091 | document_len = 0; | |
6092 | if (len > document_len) | |
6093 | len = document_len; | |
6094 | ||
6095 | memcpy (readbuf, document + offset, len); | |
6096 | xfree (document); | |
6097 | ||
6098 | return len; | |
6099 | } | |
6100 | ||
9accd112 MM |
6101 | #ifdef HAVE_LINUX_BTRACE |
6102 | ||
969c39fb | 6103 | /* See to_enable_btrace target method. */ |
9accd112 MM |
6104 | |
6105 | static struct btrace_target_info * | |
f4abbc16 | 6106 | linux_low_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
9accd112 MM |
6107 | { |
6108 | struct btrace_target_info *tinfo; | |
6109 | ||
f4abbc16 | 6110 | tinfo = linux_enable_btrace (ptid, conf); |
3aee8918 | 6111 | |
d68e53f4 | 6112 | if (tinfo != NULL && tinfo->ptr_bits == 0) |
3aee8918 PA |
6113 | { |
6114 | struct thread_info *thread = find_thread_ptid (ptid); | |
6115 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
6116 | ||
6117 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
6118 | } | |
9accd112 MM |
6119 | |
6120 | return tinfo; | |
6121 | } | |
6122 | ||
969c39fb | 6123 | /* See to_disable_btrace target method. */ |
9accd112 | 6124 | |
969c39fb MM |
6125 | static int |
6126 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
6127 | { | |
6128 | enum btrace_error err; | |
6129 | ||
6130 | err = linux_disable_btrace (tinfo); | |
6131 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
6132 | } | |
6133 | ||
6134 | /* See to_read_btrace target method. */ | |
6135 | ||
6136 | static int | |
9accd112 MM |
6137 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
6138 | int type) | |
6139 | { | |
734b0e4b | 6140 | struct btrace_data btrace; |
9accd112 | 6141 | struct btrace_block *block; |
969c39fb | 6142 | enum btrace_error err; |
9accd112 MM |
6143 | int i; |
6144 | ||
734b0e4b MM |
6145 | btrace_data_init (&btrace); |
6146 | ||
969c39fb MM |
6147 | err = linux_read_btrace (&btrace, tinfo, type); |
6148 | if (err != BTRACE_ERR_NONE) | |
6149 | { | |
6150 | if (err == BTRACE_ERR_OVERFLOW) | |
6151 | buffer_grow_str0 (buffer, "E.Overflow."); | |
6152 | else | |
6153 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
6154 | ||
734b0e4b | 6155 | btrace_data_fini (&btrace); |
969c39fb MM |
6156 | return -1; |
6157 | } | |
9accd112 | 6158 | |
734b0e4b MM |
6159 | switch (btrace.format) |
6160 | { | |
6161 | case BTRACE_FORMAT_NONE: | |
6162 | buffer_grow_str0 (buffer, "E.No Trace."); | |
6163 | break; | |
6164 | ||
6165 | case BTRACE_FORMAT_BTS: | |
6166 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
6167 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
9accd112 | 6168 | |
734b0e4b MM |
6169 | for (i = 0; |
6170 | VEC_iterate (btrace_block_s, btrace.variant.bts.blocks, i, block); | |
6171 | i++) | |
6172 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
6173 | paddress (block->begin), paddress (block->end)); | |
9accd112 | 6174 | |
734b0e4b MM |
6175 | buffer_grow_str0 (buffer, "</btrace>\n"); |
6176 | break; | |
6177 | ||
6178 | default: | |
6179 | buffer_grow_str0 (buffer, "E.Unknown Trace Format."); | |
9accd112 | 6180 | |
734b0e4b MM |
6181 | btrace_data_fini (&btrace); |
6182 | return -1; | |
6183 | } | |
969c39fb | 6184 | |
734b0e4b | 6185 | btrace_data_fini (&btrace); |
969c39fb | 6186 | return 0; |
9accd112 | 6187 | } |
f4abbc16 MM |
6188 | |
6189 | /* See to_btrace_conf target method. */ | |
6190 | ||
6191 | static int | |
6192 | linux_low_btrace_conf (const struct btrace_target_info *tinfo, | |
6193 | struct buffer *buffer) | |
6194 | { | |
6195 | const struct btrace_config *conf; | |
6196 | ||
6197 | buffer_grow_str (buffer, "<!DOCTYPE btrace-conf SYSTEM \"btrace-conf.dtd\">\n"); | |
6198 | buffer_grow_str (buffer, "<btrace-conf version=\"1.0\">\n"); | |
6199 | ||
6200 | conf = linux_btrace_conf (tinfo); | |
6201 | if (conf != NULL) | |
6202 | { | |
6203 | switch (conf->format) | |
6204 | { | |
6205 | case BTRACE_FORMAT_NONE: | |
6206 | break; | |
6207 | ||
6208 | case BTRACE_FORMAT_BTS: | |
d33501a5 MM |
6209 | buffer_xml_printf (buffer, "<bts"); |
6210 | buffer_xml_printf (buffer, " size=\"0x%x\"", conf->bts.size); | |
6211 | buffer_xml_printf (buffer, " />\n"); | |
f4abbc16 MM |
6212 | break; |
6213 | } | |
6214 | } | |
6215 | ||
6216 | buffer_grow_str0 (buffer, "</btrace-conf>\n"); | |
6217 | return 0; | |
6218 | } | |
9accd112 MM |
6219 | #endif /* HAVE_LINUX_BTRACE */ |
6220 | ||
7b669087 GB |
6221 | /* See nat/linux-nat.h. */ |
6222 | ||
6223 | ptid_t | |
6224 | current_lwp_ptid (void) | |
6225 | { | |
6226 | return ptid_of (current_thread); | |
6227 | } | |
6228 | ||
ce3a066d DJ |
6229 | static struct target_ops linux_target_ops = { |
6230 | linux_create_inferior, | |
6231 | linux_attach, | |
6232 | linux_kill, | |
6ad8ae5c | 6233 | linux_detach, |
8336d594 | 6234 | linux_mourn, |
444d6139 | 6235 | linux_join, |
ce3a066d DJ |
6236 | linux_thread_alive, |
6237 | linux_resume, | |
6238 | linux_wait, | |
6239 | linux_fetch_registers, | |
6240 | linux_store_registers, | |
90d74c30 | 6241 | linux_prepare_to_access_memory, |
0146f85b | 6242 | linux_done_accessing_memory, |
ce3a066d DJ |
6243 | linux_read_memory, |
6244 | linux_write_memory, | |
2f2893d9 | 6245 | linux_look_up_symbols, |
ef57601b | 6246 | linux_request_interrupt, |
aa691b87 | 6247 | linux_read_auxv, |
802e8e6d | 6248 | linux_supports_z_point_type, |
d993e290 PA |
6249 | linux_insert_point, |
6250 | linux_remove_point, | |
3e572f71 PA |
6251 | linux_stopped_by_sw_breakpoint, |
6252 | linux_supports_stopped_by_sw_breakpoint, | |
6253 | linux_stopped_by_hw_breakpoint, | |
6254 | linux_supports_stopped_by_hw_breakpoint, | |
e013ee27 OF |
6255 | linux_stopped_by_watchpoint, |
6256 | linux_stopped_data_address, | |
db0dfaa0 LM |
6257 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
6258 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
6259 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 6260 | linux_read_offsets, |
dae5f5cf DJ |
6261 | #else |
6262 | NULL, | |
6263 | #endif | |
6264 | #ifdef USE_THREAD_DB | |
6265 | thread_db_get_tls_address, | |
6266 | #else | |
6267 | NULL, | |
52fb6437 | 6268 | #endif |
efcbbd14 | 6269 | linux_qxfer_spu, |
59a016f0 | 6270 | hostio_last_error_from_errno, |
07e059b5 | 6271 | linux_qxfer_osdata, |
4aa995e1 | 6272 | linux_xfer_siginfo, |
bd99dc85 PA |
6273 | linux_supports_non_stop, |
6274 | linux_async, | |
6275 | linux_start_non_stop, | |
cdbfd419 PP |
6276 | linux_supports_multi_process, |
6277 | #ifdef USE_THREAD_DB | |
dc146f7c | 6278 | thread_db_handle_monitor_command, |
cdbfd419 | 6279 | #else |
dc146f7c | 6280 | NULL, |
cdbfd419 | 6281 | #endif |
d26e3629 | 6282 | linux_common_core_of_thread, |
78d85199 | 6283 | linux_read_loadmap, |
219f2f23 PA |
6284 | linux_process_qsupported, |
6285 | linux_supports_tracepoints, | |
6286 | linux_read_pc, | |
8336d594 PA |
6287 | linux_write_pc, |
6288 | linux_thread_stopped, | |
7984d532 | 6289 | NULL, |
711e434b | 6290 | linux_pause_all, |
7984d532 | 6291 | linux_unpause_all, |
fa593d66 | 6292 | linux_stabilize_threads, |
6a271cae | 6293 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
6294 | linux_emit_ops, |
6295 | linux_supports_disable_randomization, | |
405f8e94 | 6296 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 6297 | linux_qxfer_libraries_svr4, |
d1feda86 | 6298 | linux_supports_agent, |
9accd112 MM |
6299 | #ifdef HAVE_LINUX_BTRACE |
6300 | linux_supports_btrace, | |
6301 | linux_low_enable_btrace, | |
969c39fb | 6302 | linux_low_disable_btrace, |
9accd112 | 6303 | linux_low_read_btrace, |
f4abbc16 | 6304 | linux_low_btrace_conf, |
9accd112 MM |
6305 | #else |
6306 | NULL, | |
6307 | NULL, | |
6308 | NULL, | |
6309 | NULL, | |
f4abbc16 | 6310 | NULL, |
9accd112 | 6311 | #endif |
c2d6af84 | 6312 | linux_supports_range_stepping, |
ce3a066d DJ |
6313 | }; |
6314 | ||
0d62e5e8 DJ |
6315 | static void |
6316 | linux_init_signals () | |
6317 | { | |
6318 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
6319 | to find what the cancel signal actually is. */ | |
1a981360 | 6320 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 6321 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 6322 | #endif |
0d62e5e8 DJ |
6323 | } |
6324 | ||
3aee8918 PA |
6325 | #ifdef HAVE_LINUX_REGSETS |
6326 | void | |
6327 | initialize_regsets_info (struct regsets_info *info) | |
6328 | { | |
6329 | for (info->num_regsets = 0; | |
6330 | info->regsets[info->num_regsets].size >= 0; | |
6331 | info->num_regsets++) | |
6332 | ; | |
3aee8918 PA |
6333 | } |
6334 | #endif | |
6335 | ||
da6d8c04 DJ |
6336 | void |
6337 | initialize_low (void) | |
6338 | { | |
bd99dc85 PA |
6339 | struct sigaction sigchld_action; |
6340 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 6341 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
6342 | set_breakpoint_data (the_low_target.breakpoint, |
6343 | the_low_target.breakpoint_len); | |
0d62e5e8 | 6344 | linux_init_signals (); |
aa7c7447 | 6345 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
6346 | |
6347 | sigchld_action.sa_handler = sigchld_handler; | |
6348 | sigemptyset (&sigchld_action.sa_mask); | |
6349 | sigchld_action.sa_flags = SA_RESTART; | |
6350 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
6351 | |
6352 | initialize_low_arch (); | |
da6d8c04 | 6353 | } |