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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
ecd75fc8 | 2 | Copyright (C) 1995-2014 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" |
d26e3629 | 21 | #include "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 <stdio.h> |
da6d8c04 | 28 | #include <sys/ptrace.h> |
af96c192 | 29 | #include "linux-ptrace.h" |
e3deef73 | 30 | #include "linux-procfs.h" |
da6d8c04 DJ |
31 | #include <signal.h> |
32 | #include <sys/ioctl.h> | |
33 | #include <fcntl.h> | |
d07c63e7 | 34 | #include <string.h> |
0a30fbc4 DJ |
35 | #include <stdlib.h> |
36 | #include <unistd.h> | |
fa6a77dc | 37 | #include <errno.h> |
fd500816 | 38 | #include <sys/syscall.h> |
f9387fc3 | 39 | #include <sched.h> |
07e059b5 VP |
40 | #include <ctype.h> |
41 | #include <pwd.h> | |
42 | #include <sys/types.h> | |
43 | #include <dirent.h> | |
53ce3c39 | 44 | #include <sys/stat.h> |
efcbbd14 | 45 | #include <sys/vfs.h> |
1570b33e | 46 | #include <sys/uio.h> |
602e3198 | 47 | #include "filestuff.h" |
c144c7a0 | 48 | #include "tracepoint.h" |
533b0600 | 49 | #include "hostio.h" |
957f3f49 DE |
50 | #ifndef ELFMAG0 |
51 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
52 | then ELFMAG0 will have been defined. If it didn't get included by | |
53 | gdb_proc_service.h then including it will likely introduce a duplicate | |
54 | definition of elf_fpregset_t. */ | |
55 | #include <elf.h> | |
56 | #endif | |
efcbbd14 UW |
57 | |
58 | #ifndef SPUFS_MAGIC | |
59 | #define SPUFS_MAGIC 0x23c9b64e | |
60 | #endif | |
da6d8c04 | 61 | |
03583c20 UW |
62 | #ifdef HAVE_PERSONALITY |
63 | # include <sys/personality.h> | |
64 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
65 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
66 | # endif | |
67 | #endif | |
68 | ||
fd462a61 DJ |
69 | #ifndef O_LARGEFILE |
70 | #define O_LARGEFILE 0 | |
71 | #endif | |
72 | ||
ec8ebe72 DE |
73 | #ifndef W_STOPCODE |
74 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
75 | #endif | |
76 | ||
1a981360 PA |
77 | /* This is the kernel's hard limit. Not to be confused with |
78 | SIGRTMIN. */ | |
79 | #ifndef __SIGRTMIN | |
80 | #define __SIGRTMIN 32 | |
81 | #endif | |
82 | ||
db0dfaa0 LM |
83 | /* Some targets did not define these ptrace constants from the start, |
84 | so gdbserver defines them locally here. In the future, these may | |
85 | be removed after they are added to asm/ptrace.h. */ | |
86 | #if !(defined(PT_TEXT_ADDR) \ | |
87 | || defined(PT_DATA_ADDR) \ | |
88 | || defined(PT_TEXT_END_ADDR)) | |
89 | #if defined(__mcoldfire__) | |
90 | /* These are still undefined in 3.10 kernels. */ | |
91 | #define PT_TEXT_ADDR 49*4 | |
92 | #define PT_DATA_ADDR 50*4 | |
93 | #define PT_TEXT_END_ADDR 51*4 | |
94 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
95 | #elif defined(BFIN) | |
96 | #define PT_TEXT_ADDR 220 | |
97 | #define PT_TEXT_END_ADDR 224 | |
98 | #define PT_DATA_ADDR 228 | |
99 | /* These are still undefined in 3.10 kernels. */ | |
100 | #elif defined(__TMS320C6X__) | |
101 | #define PT_TEXT_ADDR (0x10000*4) | |
102 | #define PT_DATA_ADDR (0x10004*4) | |
103 | #define PT_TEXT_END_ADDR (0x10008*4) | |
104 | #endif | |
105 | #endif | |
106 | ||
9accd112 MM |
107 | #ifdef HAVE_LINUX_BTRACE |
108 | # include "linux-btrace.h" | |
109 | #endif | |
110 | ||
8365dcf5 TJB |
111 | #ifndef HAVE_ELF32_AUXV_T |
112 | /* Copied from glibc's elf.h. */ | |
113 | typedef struct | |
114 | { | |
115 | uint32_t a_type; /* Entry type */ | |
116 | union | |
117 | { | |
118 | uint32_t a_val; /* Integer value */ | |
119 | /* We use to have pointer elements added here. We cannot do that, | |
120 | though, since it does not work when using 32-bit definitions | |
121 | on 64-bit platforms and vice versa. */ | |
122 | } a_un; | |
123 | } Elf32_auxv_t; | |
124 | #endif | |
125 | ||
126 | #ifndef HAVE_ELF64_AUXV_T | |
127 | /* Copied from glibc's elf.h. */ | |
128 | typedef struct | |
129 | { | |
130 | uint64_t a_type; /* Entry type */ | |
131 | union | |
132 | { | |
133 | uint64_t a_val; /* Integer value */ | |
134 | /* We use to have pointer elements added here. We cannot do that, | |
135 | though, since it does not work when using 32-bit definitions | |
136 | on 64-bit platforms and vice versa. */ | |
137 | } a_un; | |
138 | } Elf64_auxv_t; | |
139 | #endif | |
140 | ||
24a09b5f DJ |
141 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
142 | representation of the thread ID. | |
611cb4a5 | 143 | |
54a0b537 | 144 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
145 | the same as the LWP ID. |
146 | ||
147 | ``all_processes'' is keyed by the "overall process ID", which | |
148 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 149 | |
54a0b537 | 150 | struct inferior_list all_lwps; |
0d62e5e8 | 151 | |
05044653 PA |
152 | /* A list of all unknown processes which receive stop signals. Some |
153 | other process will presumably claim each of these as forked | |
154 | children momentarily. */ | |
24a09b5f | 155 | |
05044653 PA |
156 | struct simple_pid_list |
157 | { | |
158 | /* The process ID. */ | |
159 | int pid; | |
160 | ||
161 | /* The status as reported by waitpid. */ | |
162 | int status; | |
163 | ||
164 | /* Next in chain. */ | |
165 | struct simple_pid_list *next; | |
166 | }; | |
167 | struct simple_pid_list *stopped_pids; | |
168 | ||
169 | /* Trivial list manipulation functions to keep track of a list of new | |
170 | stopped processes. */ | |
171 | ||
172 | static void | |
173 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
174 | { | |
175 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
176 | ||
177 | new_pid->pid = pid; | |
178 | new_pid->status = status; | |
179 | new_pid->next = *listp; | |
180 | *listp = new_pid; | |
181 | } | |
182 | ||
183 | static int | |
184 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
185 | { | |
186 | struct simple_pid_list **p; | |
187 | ||
188 | for (p = listp; *p != NULL; p = &(*p)->next) | |
189 | if ((*p)->pid == pid) | |
190 | { | |
191 | struct simple_pid_list *next = (*p)->next; | |
192 | ||
193 | *statusp = (*p)->status; | |
194 | xfree (*p); | |
195 | *p = next; | |
196 | return 1; | |
197 | } | |
198 | return 0; | |
199 | } | |
24a09b5f | 200 | |
bde24c0a PA |
201 | enum stopping_threads_kind |
202 | { | |
203 | /* Not stopping threads presently. */ | |
204 | NOT_STOPPING_THREADS, | |
205 | ||
206 | /* Stopping threads. */ | |
207 | STOPPING_THREADS, | |
208 | ||
209 | /* Stopping and suspending threads. */ | |
210 | STOPPING_AND_SUSPENDING_THREADS | |
211 | }; | |
212 | ||
213 | /* This is set while stop_all_lwps is in effect. */ | |
214 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
215 | |
216 | /* FIXME make into a target method? */ | |
24a09b5f | 217 | int using_threads = 1; |
24a09b5f | 218 | |
fa593d66 PA |
219 | /* True if we're presently stabilizing threads (moving them out of |
220 | jump pads). */ | |
221 | static int stabilizing_threads; | |
222 | ||
2acc282a | 223 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 224 | int step, int signal, siginfo_t *info); |
2bd7c093 | 225 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
226 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
227 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 228 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 229 | static void *add_lwp (ptid_t ptid); |
c35fafde | 230 | static int linux_stopped_by_watchpoint (void); |
95954743 | 231 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 232 | static void proceed_all_lwps (void); |
d50171e4 PA |
233 | static int finish_step_over (struct lwp_info *lwp); |
234 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
235 | static int kill_lwp (unsigned long lwpid, int signo); | |
236 | ||
237 | /* True if the low target can hardware single-step. Such targets | |
238 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
239 | ||
240 | static int | |
241 | can_hardware_single_step (void) | |
242 | { | |
243 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
244 | } | |
245 | ||
246 | /* True if the low target supports memory breakpoints. If so, we'll | |
247 | have a GET_PC implementation. */ | |
248 | ||
249 | static int | |
250 | supports_breakpoints (void) | |
251 | { | |
252 | return (the_low_target.get_pc != NULL); | |
253 | } | |
0d62e5e8 | 254 | |
fa593d66 PA |
255 | /* Returns true if this target can support fast tracepoints. This |
256 | does not mean that the in-process agent has been loaded in the | |
257 | inferior. */ | |
258 | ||
259 | static int | |
260 | supports_fast_tracepoints (void) | |
261 | { | |
262 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
263 | } | |
264 | ||
c2d6af84 PA |
265 | /* True if LWP is stopped in its stepping range. */ |
266 | ||
267 | static int | |
268 | lwp_in_step_range (struct lwp_info *lwp) | |
269 | { | |
270 | CORE_ADDR pc = lwp->stop_pc; | |
271 | ||
272 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
273 | } | |
274 | ||
0d62e5e8 DJ |
275 | struct pending_signals |
276 | { | |
277 | int signal; | |
32ca6d61 | 278 | siginfo_t info; |
0d62e5e8 DJ |
279 | struct pending_signals *prev; |
280 | }; | |
611cb4a5 | 281 | |
bd99dc85 PA |
282 | /* The read/write ends of the pipe registered as waitable file in the |
283 | event loop. */ | |
284 | static int linux_event_pipe[2] = { -1, -1 }; | |
285 | ||
286 | /* True if we're currently in async mode. */ | |
287 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
288 | ||
02fc4de7 | 289 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
290 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
291 | ||
d0722149 DE |
292 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
293 | ||
294 | static int | |
214d508e | 295 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 296 | { |
214d508e L |
297 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
298 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
299 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
300 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
301 | { | |
302 | *machine = header->e_machine; | |
303 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
304 | ||
305 | } | |
306 | *machine = EM_NONE; | |
307 | return -1; | |
d0722149 DE |
308 | } |
309 | ||
310 | /* Return non-zero if FILE is a 64-bit ELF file, | |
311 | zero if the file is not a 64-bit ELF file, | |
312 | and -1 if the file is not accessible or doesn't exist. */ | |
313 | ||
be07f1a2 | 314 | static int |
214d508e | 315 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 316 | { |
957f3f49 | 317 | Elf64_Ehdr header; |
d0722149 DE |
318 | int fd; |
319 | ||
320 | fd = open (file, O_RDONLY); | |
321 | if (fd < 0) | |
322 | return -1; | |
323 | ||
324 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
325 | { | |
326 | close (fd); | |
327 | return 0; | |
328 | } | |
329 | close (fd); | |
330 | ||
214d508e | 331 | return elf_64_header_p (&header, machine); |
d0722149 DE |
332 | } |
333 | ||
be07f1a2 PA |
334 | /* Accepts an integer PID; Returns true if the executable PID is |
335 | running is a 64-bit ELF file.. */ | |
336 | ||
337 | int | |
214d508e | 338 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 339 | { |
d8d2a3ee | 340 | char file[PATH_MAX]; |
be07f1a2 PA |
341 | |
342 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 343 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
344 | } |
345 | ||
bd99dc85 PA |
346 | static void |
347 | delete_lwp (struct lwp_info *lwp) | |
348 | { | |
349 | remove_thread (get_lwp_thread (lwp)); | |
80894984 | 350 | remove_inferior (&all_lwps, &lwp->entry); |
aa5ca48f | 351 | free (lwp->arch_private); |
bd99dc85 PA |
352 | free (lwp); |
353 | } | |
354 | ||
95954743 PA |
355 | /* Add a process to the common process list, and set its private |
356 | data. */ | |
357 | ||
358 | static struct process_info * | |
359 | linux_add_process (int pid, int attached) | |
360 | { | |
361 | struct process_info *proc; | |
362 | ||
95954743 PA |
363 | proc = add_process (pid, attached); |
364 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
365 | ||
3aee8918 PA |
366 | /* Set the arch when the first LWP stops. */ |
367 | proc->private->new_inferior = 1; | |
368 | ||
aa5ca48f DE |
369 | if (the_low_target.new_process != NULL) |
370 | proc->private->arch_private = the_low_target.new_process (); | |
371 | ||
95954743 PA |
372 | return proc; |
373 | } | |
374 | ||
bd99dc85 PA |
375 | /* Handle a GNU/Linux extended wait response. If we see a clone |
376 | event, we need to add the new LWP to our list (and not report the | |
377 | trap to higher layers). */ | |
0d62e5e8 | 378 | |
24a09b5f | 379 | static void |
54a0b537 | 380 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
381 | { |
382 | int event = wstat >> 16; | |
54a0b537 | 383 | struct lwp_info *new_lwp; |
24a09b5f DJ |
384 | |
385 | if (event == PTRACE_EVENT_CLONE) | |
386 | { | |
95954743 | 387 | ptid_t ptid; |
24a09b5f | 388 | unsigned long new_pid; |
05044653 | 389 | int ret, status; |
24a09b5f | 390 | |
b8e1b30e | 391 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 392 | &new_pid); |
24a09b5f DJ |
393 | |
394 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 395 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
396 | { |
397 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
398 | hits the SIGSTOP, but we're already attached. */ | |
399 | ||
97438e3f | 400 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
401 | |
402 | if (ret == -1) | |
403 | perror_with_name ("waiting for new child"); | |
404 | else if (ret != new_pid) | |
405 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 406 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
407 | warning ("wait returned unexpected status 0x%x", status); |
408 | } | |
409 | ||
95954743 PA |
410 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
411 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
412 | add_thread (ptid, new_lwp); | |
24a09b5f | 413 | |
e27d73f6 DE |
414 | /* Either we're going to immediately resume the new thread |
415 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
416 | thinks the thread is currently running, so set this first | |
417 | before calling linux_resume_one_lwp. */ | |
418 | new_lwp->stopped = 1; | |
419 | ||
bde24c0a PA |
420 | /* If we're suspending all threads, leave this one suspended |
421 | too. */ | |
422 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
423 | new_lwp->suspended = 1; | |
424 | ||
da5898ce DJ |
425 | /* Normally we will get the pending SIGSTOP. But in some cases |
426 | we might get another signal delivered to the group first. | |
f21cc1a2 | 427 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
428 | if (WSTOPSIG (status) == SIGSTOP) |
429 | { | |
bde24c0a | 430 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
431 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
432 | else | |
e27d73f6 | 433 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 434 | } |
24a09b5f | 435 | else |
da5898ce | 436 | { |
54a0b537 | 437 | new_lwp->stop_expected = 1; |
d50171e4 | 438 | |
bde24c0a | 439 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 440 | { |
d50171e4 | 441 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
442 | new_lwp->status_pending_p = 1; |
443 | new_lwp->status_pending = status; | |
da5898ce DJ |
444 | } |
445 | else | |
446 | /* Pass the signal on. This is what GDB does - except | |
447 | shouldn't we really report it instead? */ | |
e27d73f6 | 448 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 449 | } |
24a09b5f DJ |
450 | |
451 | /* Always resume the current thread. If we are stopping | |
452 | threads, it will have a pending SIGSTOP; we may as well | |
453 | collect it now. */ | |
2acc282a | 454 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
455 | } |
456 | } | |
457 | ||
d50171e4 PA |
458 | /* Return the PC as read from the regcache of LWP, without any |
459 | adjustment. */ | |
460 | ||
461 | static CORE_ADDR | |
462 | get_pc (struct lwp_info *lwp) | |
463 | { | |
464 | struct thread_info *saved_inferior; | |
465 | struct regcache *regcache; | |
466 | CORE_ADDR pc; | |
467 | ||
468 | if (the_low_target.get_pc == NULL) | |
469 | return 0; | |
470 | ||
471 | saved_inferior = current_inferior; | |
472 | current_inferior = get_lwp_thread (lwp); | |
473 | ||
474 | regcache = get_thread_regcache (current_inferior, 1); | |
475 | pc = (*the_low_target.get_pc) (regcache); | |
476 | ||
477 | if (debug_threads) | |
87ce2a04 | 478 | debug_printf ("pc is 0x%lx\n", (long) pc); |
d50171e4 PA |
479 | |
480 | current_inferior = saved_inferior; | |
481 | return pc; | |
482 | } | |
483 | ||
484 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
485 | The SIGTRAP could mean several things. |
486 | ||
487 | On i386, where decr_pc_after_break is non-zero: | |
488 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
489 | we will get only the one SIGTRAP (even if the instruction we | |
490 | stepped over was a breakpoint). The value of $eip will be the | |
491 | next instruction. | |
492 | If we continue the process using PTRACE_CONT, we will get a | |
493 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
494 | the instruction after the breakpoint (i.e. needs to be | |
495 | decremented). If we report the SIGTRAP to GDB, we must also | |
496 | report the undecremented PC. If we cancel the SIGTRAP, we | |
497 | must resume at the decremented PC. | |
498 | ||
499 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
500 | with hardware or kernel single-step: | |
501 | If we single-step over a breakpoint instruction, our PC will | |
502 | point at the following instruction. If we continue and hit a | |
503 | breakpoint instruction, our PC will point at the breakpoint | |
504 | instruction. */ | |
505 | ||
506 | static CORE_ADDR | |
d50171e4 | 507 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 508 | { |
d50171e4 PA |
509 | CORE_ADDR stop_pc; |
510 | ||
511 | if (the_low_target.get_pc == NULL) | |
512 | return 0; | |
0d62e5e8 | 513 | |
d50171e4 PA |
514 | stop_pc = get_pc (lwp); |
515 | ||
bdabb078 PA |
516 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
517 | && !lwp->stepping | |
518 | && !lwp->stopped_by_watchpoint | |
519 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
520 | stop_pc -= the_low_target.decr_pc_after_break; |
521 | ||
522 | if (debug_threads) | |
87ce2a04 | 523 | debug_printf ("stop pc is 0x%lx\n", (long) stop_pc); |
47c0c975 DE |
524 | |
525 | return stop_pc; | |
0d62e5e8 | 526 | } |
ce3a066d | 527 | |
0d62e5e8 | 528 | static void * |
95954743 | 529 | add_lwp (ptid_t ptid) |
611cb4a5 | 530 | { |
54a0b537 | 531 | struct lwp_info *lwp; |
0d62e5e8 | 532 | |
54a0b537 PA |
533 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
534 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 535 | |
80894984 | 536 | lwp->entry.id = ptid; |
0d62e5e8 | 537 | |
aa5ca48f DE |
538 | if (the_low_target.new_thread != NULL) |
539 | lwp->arch_private = the_low_target.new_thread (); | |
540 | ||
80894984 | 541 | add_inferior_to_list (&all_lwps, &lwp->entry); |
0d62e5e8 | 542 | |
54a0b537 | 543 | return lwp; |
0d62e5e8 | 544 | } |
611cb4a5 | 545 | |
da6d8c04 DJ |
546 | /* Start an inferior process and returns its pid. |
547 | ALLARGS is a vector of program-name and args. */ | |
548 | ||
ce3a066d DJ |
549 | static int |
550 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 551 | { |
03583c20 UW |
552 | #ifdef HAVE_PERSONALITY |
553 | int personality_orig = 0, personality_set = 0; | |
554 | #endif | |
a6dbe5df | 555 | struct lwp_info *new_lwp; |
da6d8c04 | 556 | int pid; |
95954743 | 557 | ptid_t ptid; |
da6d8c04 | 558 | |
03583c20 UW |
559 | #ifdef HAVE_PERSONALITY |
560 | if (disable_randomization) | |
561 | { | |
562 | errno = 0; | |
563 | personality_orig = personality (0xffffffff); | |
564 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
565 | { | |
566 | personality_set = 1; | |
567 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
568 | } | |
569 | if (errno != 0 || (personality_set | |
570 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
571 | warning ("Error disabling address space randomization: %s", | |
572 | strerror (errno)); | |
573 | } | |
574 | #endif | |
575 | ||
42c81e2a | 576 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
577 | pid = vfork (); |
578 | #else | |
da6d8c04 | 579 | pid = fork (); |
52fb6437 | 580 | #endif |
da6d8c04 DJ |
581 | if (pid < 0) |
582 | perror_with_name ("fork"); | |
583 | ||
584 | if (pid == 0) | |
585 | { | |
602e3198 | 586 | close_most_fds (); |
b8e1b30e | 587 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 588 | |
1a981360 | 589 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 590 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 591 | #endif |
0d62e5e8 | 592 | |
a9fa9f7d DJ |
593 | setpgid (0, 0); |
594 | ||
e0f9f062 DE |
595 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
596 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
597 | Also, redirect stdin to /dev/null. */ | |
598 | if (remote_connection_is_stdio ()) | |
599 | { | |
600 | close (0); | |
601 | open ("/dev/null", O_RDONLY); | |
602 | dup2 (2, 1); | |
3e52c33d JK |
603 | if (write (2, "stdin/stdout redirected\n", |
604 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
605 | { |
606 | /* Errors ignored. */; | |
607 | } | |
e0f9f062 DE |
608 | } |
609 | ||
2b876972 DJ |
610 | execv (program, allargs); |
611 | if (errno == ENOENT) | |
612 | execvp (program, allargs); | |
da6d8c04 DJ |
613 | |
614 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 615 | strerror (errno)); |
da6d8c04 DJ |
616 | fflush (stderr); |
617 | _exit (0177); | |
618 | } | |
619 | ||
03583c20 UW |
620 | #ifdef HAVE_PERSONALITY |
621 | if (personality_set) | |
622 | { | |
623 | errno = 0; | |
624 | personality (personality_orig); | |
625 | if (errno != 0) | |
626 | warning ("Error restoring address space randomization: %s", | |
627 | strerror (errno)); | |
628 | } | |
629 | #endif | |
630 | ||
95954743 PA |
631 | linux_add_process (pid, 0); |
632 | ||
633 | ptid = ptid_build (pid, pid, 0); | |
634 | new_lwp = add_lwp (ptid); | |
635 | add_thread (ptid, new_lwp); | |
a6dbe5df | 636 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 637 | |
a9fa9f7d | 638 | return pid; |
da6d8c04 DJ |
639 | } |
640 | ||
641 | /* Attach to an inferior process. */ | |
642 | ||
95954743 PA |
643 | static void |
644 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 645 | { |
95954743 | 646 | ptid_t ptid; |
54a0b537 | 647 | struct lwp_info *new_lwp; |
611cb4a5 | 648 | |
b8e1b30e | 649 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 650 | != 0) |
da6d8c04 | 651 | { |
87b0bb13 JK |
652 | struct buffer buffer; |
653 | ||
95954743 | 654 | if (!initial) |
2d717e4f DJ |
655 | { |
656 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 657 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
658 | strerror (errno), errno); |
659 | fflush (stderr); | |
660 | return; | |
661 | } | |
5f572dec JK |
662 | |
663 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
664 | buffer_init (&buffer); |
665 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
666 | buffer_grow_str0 (&buffer, ""); | |
667 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
668 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
669 | } |
670 | ||
95954743 | 671 | if (initial) |
e3deef73 LM |
672 | /* If lwp is the tgid, we handle adding existing threads later. |
673 | Otherwise we just add lwp without bothering about any other | |
674 | threads. */ | |
95954743 PA |
675 | ptid = ptid_build (lwpid, lwpid, 0); |
676 | else | |
677 | { | |
678 | /* Note that extracting the pid from the current inferior is | |
679 | safe, since we're always called in the context of the same | |
680 | process as this new thread. */ | |
681 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
682 | ptid = ptid_build (pid, lwpid, 0); | |
683 | } | |
24a09b5f | 684 | |
95954743 PA |
685 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
686 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 687 | |
a6dbe5df PA |
688 | /* We need to wait for SIGSTOP before being able to make the next |
689 | ptrace call on this LWP. */ | |
690 | new_lwp->must_set_ptrace_flags = 1; | |
691 | ||
644cebc9 | 692 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
693 | { |
694 | if (debug_threads) | |
87ce2a04 | 695 | debug_printf ("Attached to a stopped process\n"); |
c14d7ab2 PA |
696 | |
697 | /* The process is definitely stopped. It is in a job control | |
698 | stop, unless the kernel predates the TASK_STOPPED / | |
699 | TASK_TRACED distinction, in which case it might be in a | |
700 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
701 | can kill it, signal it, et cetera. | |
702 | ||
703 | First make sure there is a pending SIGSTOP. Since we are | |
704 | already attached, the process can not transition from stopped | |
705 | to running without a PTRACE_CONT; so we know this signal will | |
706 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
707 | probably already in the queue (unless this kernel is old | |
708 | enough to use TASK_STOPPED for ptrace stops); but since | |
709 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
710 | kill_lwp (lwpid, SIGSTOP); | |
711 | ||
712 | /* Finally, resume the stopped process. This will deliver the | |
713 | SIGSTOP (or a higher priority signal, just like normal | |
714 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 715 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
716 | } |
717 | ||
0d62e5e8 | 718 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
719 | brings it to a halt. |
720 | ||
721 | There are several cases to consider here: | |
722 | ||
723 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 724 | of a new thread that is being created. |
d50171e4 PA |
725 | In this case we should ignore that SIGSTOP and resume the |
726 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 727 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 728 | resume_continue. |
0e21c1ec DE |
729 | |
730 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
731 | to it via attach_inferior. |
732 | In this case we want the process thread to stop. | |
d50171e4 PA |
733 | This is handled by having linux_attach set last_resume_kind == |
734 | resume_stop after we return. | |
e3deef73 LM |
735 | |
736 | If the pid we are attaching to is also the tgid, we attach to and | |
737 | stop all the existing threads. Otherwise, we attach to pid and | |
738 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
739 | |
740 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
741 | existing threads. |
742 | In this case we want the thread to stop. | |
743 | FIXME: This case is currently not properly handled. | |
744 | We should wait for the SIGSTOP but don't. Things work apparently | |
745 | because enough time passes between when we ptrace (ATTACH) and when | |
746 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
747 | |
748 | On the other hand, if we are currently trying to stop all threads, we | |
749 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 750 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
751 | end of the list, and so the new thread has not yet reached |
752 | wait_for_sigstop (but will). */ | |
d50171e4 | 753 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
754 | } |
755 | ||
95954743 PA |
756 | void |
757 | linux_attach_lwp (unsigned long lwpid) | |
758 | { | |
759 | linux_attach_lwp_1 (lwpid, 0); | |
760 | } | |
761 | ||
e3deef73 LM |
762 | /* Attach to PID. If PID is the tgid, attach to it and all |
763 | of its threads. */ | |
764 | ||
c52daf70 | 765 | static int |
a1928bad | 766 | linux_attach (unsigned long pid) |
0d62e5e8 | 767 | { |
e3deef73 LM |
768 | /* Attach to PID. We will check for other threads |
769 | soon. */ | |
95954743 | 770 | linux_attach_lwp_1 (pid, 1); |
95954743 | 771 | linux_add_process (pid, 1); |
0d62e5e8 | 772 | |
bd99dc85 PA |
773 | if (!non_stop) |
774 | { | |
8336d594 PA |
775 | struct thread_info *thread; |
776 | ||
777 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
778 | process. It will be collected by wait shortly. */ | |
779 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
780 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 781 | } |
0d62e5e8 | 782 | |
e3deef73 LM |
783 | if (linux_proc_get_tgid (pid) == pid) |
784 | { | |
785 | DIR *dir; | |
786 | char pathname[128]; | |
787 | ||
788 | sprintf (pathname, "/proc/%ld/task", pid); | |
789 | ||
790 | dir = opendir (pathname); | |
791 | ||
792 | if (!dir) | |
793 | { | |
794 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
795 | fflush (stderr); | |
796 | } | |
797 | else | |
798 | { | |
799 | /* At this point we attached to the tgid. Scan the task for | |
800 | existing threads. */ | |
801 | unsigned long lwp; | |
802 | int new_threads_found; | |
803 | int iterations = 0; | |
804 | struct dirent *dp; | |
805 | ||
806 | while (iterations < 2) | |
807 | { | |
808 | new_threads_found = 0; | |
809 | /* Add all the other threads. While we go through the | |
810 | threads, new threads may be spawned. Cycle through | |
811 | the list of threads until we have done two iterations without | |
812 | finding new threads. */ | |
813 | while ((dp = readdir (dir)) != NULL) | |
814 | { | |
815 | /* Fetch one lwp. */ | |
816 | lwp = strtoul (dp->d_name, NULL, 10); | |
817 | ||
818 | /* Is this a new thread? */ | |
819 | if (lwp | |
820 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
821 | { | |
822 | linux_attach_lwp_1 (lwp, 0); | |
823 | new_threads_found++; | |
824 | ||
825 | if (debug_threads) | |
87ce2a04 DE |
826 | debug_printf ("Found and attached to new lwp %ld\n", |
827 | lwp); | |
e3deef73 LM |
828 | } |
829 | } | |
830 | ||
831 | if (!new_threads_found) | |
832 | iterations++; | |
833 | else | |
834 | iterations = 0; | |
835 | ||
836 | rewinddir (dir); | |
837 | } | |
838 | closedir (dir); | |
839 | } | |
840 | } | |
841 | ||
95954743 PA |
842 | return 0; |
843 | } | |
844 | ||
845 | struct counter | |
846 | { | |
847 | int pid; | |
848 | int count; | |
849 | }; | |
850 | ||
851 | static int | |
852 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
853 | { | |
854 | struct counter *counter = args; | |
855 | ||
856 | if (ptid_get_pid (entry->id) == counter->pid) | |
857 | { | |
858 | if (++counter->count > 1) | |
859 | return 1; | |
860 | } | |
d61ddec4 | 861 | |
da6d8c04 DJ |
862 | return 0; |
863 | } | |
864 | ||
95954743 PA |
865 | static int |
866 | last_thread_of_process_p (struct thread_info *thread) | |
867 | { | |
80894984 | 868 | ptid_t ptid = thread->entry.id; |
95954743 PA |
869 | int pid = ptid_get_pid (ptid); |
870 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 871 | |
95954743 PA |
872 | return (find_inferior (&all_threads, |
873 | second_thread_of_pid_p, &counter) == NULL); | |
874 | } | |
875 | ||
da84f473 PA |
876 | /* Kill LWP. */ |
877 | ||
878 | static void | |
879 | linux_kill_one_lwp (struct lwp_info *lwp) | |
880 | { | |
881 | int pid = lwpid_of (lwp); | |
882 | ||
883 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
884 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
885 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
886 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
887 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
888 | per process, not one for each thread. But since we still support | |
889 | linuxthreads, and we also support debugging programs using raw | |
890 | clone without CLONE_THREAD, we send one for each thread. For | |
891 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
892 | about some old kernels where PTRACE_KILL might work better | |
893 | (dubious if there are any such, but that's why it's paranoia), so | |
894 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
895 | everywhere. */ | |
896 | ||
897 | errno = 0; | |
898 | kill (pid, SIGKILL); | |
899 | if (debug_threads) | |
87ce2a04 DE |
900 | debug_printf ("LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", |
901 | target_pid_to_str (ptid_of (lwp)), | |
902 | errno ? strerror (errno) : "OK"); | |
da84f473 PA |
903 | |
904 | errno = 0; | |
b8e1b30e | 905 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 | 906 | if (debug_threads) |
87ce2a04 DE |
907 | debug_printf ("LKL: PTRACE_KILL %s, 0, 0 (%s)\n", |
908 | target_pid_to_str (ptid_of (lwp)), | |
909 | errno ? strerror (errno) : "OK"); | |
da84f473 PA |
910 | } |
911 | ||
912 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
913 | except the leader. */ | |
95954743 PA |
914 | |
915 | static int | |
da84f473 | 916 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 917 | { |
0d62e5e8 | 918 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 919 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 920 | int wstat; |
95954743 PA |
921 | int pid = * (int *) args; |
922 | ||
923 | if (ptid_get_pid (entry->id) != pid) | |
924 | return 0; | |
0d62e5e8 | 925 | |
fd500816 DJ |
926 | /* We avoid killing the first thread here, because of a Linux kernel (at |
927 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
928 | the children get a chance to be reaped, it will remain a zombie | |
929 | forever. */ | |
95954743 | 930 | |
12b42a12 | 931 | if (lwpid_of (lwp) == pid) |
95954743 PA |
932 | { |
933 | if (debug_threads) | |
87ce2a04 DE |
934 | debug_printf ("lkop: is last of process %s\n", |
935 | target_pid_to_str (entry->id)); | |
95954743 PA |
936 | return 0; |
937 | } | |
fd500816 | 938 | |
0d62e5e8 DJ |
939 | do |
940 | { | |
da84f473 | 941 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
942 | |
943 | /* Make sure it died. The loop is most likely unnecessary. */ | |
80894984 | 944 | pid = linux_wait_for_event (lwp->entry.id, &wstat, __WALL); |
bd99dc85 | 945 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
946 | |
947 | return 0; | |
da6d8c04 DJ |
948 | } |
949 | ||
95954743 PA |
950 | static int |
951 | linux_kill (int pid) | |
0d62e5e8 | 952 | { |
95954743 | 953 | struct process_info *process; |
54a0b537 | 954 | struct lwp_info *lwp; |
fd500816 | 955 | int wstat; |
95954743 | 956 | int lwpid; |
fd500816 | 957 | |
95954743 PA |
958 | process = find_process_pid (pid); |
959 | if (process == NULL) | |
960 | return -1; | |
9d606399 | 961 | |
f9e39928 PA |
962 | /* If we're killing a running inferior, make sure it is stopped |
963 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 964 | stop_all_lwps (0, NULL); |
f9e39928 | 965 | |
da84f473 | 966 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 967 | |
54a0b537 | 968 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 969 | thread in the list, so do so now. */ |
95954743 | 970 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 971 | |
784867a5 | 972 | if (lwp == NULL) |
fd500816 | 973 | { |
784867a5 | 974 | if (debug_threads) |
87ce2a04 DE |
975 | debug_printf ("lk_1: cannot find lwp %ld, for pid: %d\n", |
976 | lwpid_of (lwp), pid); | |
784867a5 JK |
977 | } |
978 | else | |
979 | { | |
980 | if (debug_threads) | |
87ce2a04 DE |
981 | debug_printf ("lk_1: killing lwp %ld, for pid: %d\n", |
982 | lwpid_of (lwp), pid); | |
fd500816 | 983 | |
784867a5 JK |
984 | do |
985 | { | |
da84f473 | 986 | linux_kill_one_lwp (lwp); |
784867a5 JK |
987 | |
988 | /* Make sure it died. The loop is most likely unnecessary. */ | |
80894984 | 989 | lwpid = linux_wait_for_event (lwp->entry.id, &wstat, __WALL); |
784867a5 JK |
990 | } while (lwpid > 0 && WIFSTOPPED (wstat)); |
991 | } | |
2d717e4f | 992 | |
8336d594 | 993 | the_target->mourn (process); |
f9e39928 PA |
994 | |
995 | /* Since we presently can only stop all lwps of all processes, we | |
996 | need to unstop lwps of other processes. */ | |
7984d532 | 997 | unstop_all_lwps (0, NULL); |
95954743 | 998 | return 0; |
0d62e5e8 DJ |
999 | } |
1000 | ||
9b224c5e PA |
1001 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1002 | signal the thread last stopped for, which we need to deliver to the | |
1003 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1004 | ||
1005 | static int | |
1006 | get_detach_signal (struct thread_info *thread) | |
1007 | { | |
a493e3e2 | 1008 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1009 | int status; |
1010 | struct lwp_info *lp = get_thread_lwp (thread); | |
1011 | ||
1012 | if (lp->status_pending_p) | |
1013 | status = lp->status_pending; | |
1014 | else | |
1015 | { | |
1016 | /* If the thread had been suspended by gdbserver, and it stopped | |
1017 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1018 | want to deliver that SIGSTOP. */ | |
1019 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1020 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1021 | return 0; |
1022 | ||
1023 | /* Otherwise, we may need to deliver the signal we | |
1024 | intercepted. */ | |
1025 | status = lp->last_status; | |
1026 | } | |
1027 | ||
1028 | if (!WIFSTOPPED (status)) | |
1029 | { | |
1030 | if (debug_threads) | |
87ce2a04 DE |
1031 | debug_printf ("GPS: lwp %s hasn't stopped: no pending signal\n", |
1032 | target_pid_to_str (ptid_of (lp))); | |
9b224c5e PA |
1033 | return 0; |
1034 | } | |
1035 | ||
1036 | /* Extended wait statuses aren't real SIGTRAPs. */ | |
1037 | if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1038 | { | |
1039 | if (debug_threads) | |
87ce2a04 DE |
1040 | debug_printf ("GPS: lwp %s had stopped with extended " |
1041 | "status: no pending signal\n", | |
1042 | target_pid_to_str (ptid_of (lp))); | |
9b224c5e PA |
1043 | return 0; |
1044 | } | |
1045 | ||
2ea28649 | 1046 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1047 | |
1048 | if (program_signals_p && !program_signals[signo]) | |
1049 | { | |
1050 | if (debug_threads) | |
87ce2a04 DE |
1051 | debug_printf ("GPS: lwp %s had signal %s, but it is in nopass state\n", |
1052 | target_pid_to_str (ptid_of (lp)), | |
1053 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1054 | return 0; |
1055 | } | |
1056 | else if (!program_signals_p | |
1057 | /* If we have no way to know which signals GDB does not | |
1058 | want to have passed to the program, assume | |
1059 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1060 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1061 | { |
1062 | if (debug_threads) | |
87ce2a04 DE |
1063 | debug_printf ("GPS: lwp %s had signal %s, " |
1064 | "but we don't know if we should pass it. " | |
1065 | "Default to not.\n", | |
1066 | target_pid_to_str (ptid_of (lp)), | |
1067 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1068 | return 0; |
1069 | } | |
1070 | else | |
1071 | { | |
1072 | if (debug_threads) | |
87ce2a04 DE |
1073 | debug_printf ("GPS: lwp %s has pending signal %s: delivering it.\n", |
1074 | target_pid_to_str (ptid_of (lp)), | |
1075 | gdb_signal_to_string (signo)); | |
9b224c5e PA |
1076 | |
1077 | return WSTOPSIG (status); | |
1078 | } | |
1079 | } | |
1080 | ||
95954743 PA |
1081 | static int |
1082 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1083 | { |
1084 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1085 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1086 | int pid = * (int *) args; |
9b224c5e | 1087 | int sig; |
95954743 PA |
1088 | |
1089 | if (ptid_get_pid (entry->id) != pid) | |
1090 | return 0; | |
6ad8ae5c | 1091 | |
9b224c5e | 1092 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1093 | if (lwp->stop_expected) |
ae13219e | 1094 | { |
9b224c5e | 1095 | if (debug_threads) |
87ce2a04 DE |
1096 | debug_printf ("Sending SIGCONT to %s\n", |
1097 | target_pid_to_str (ptid_of (lwp))); | |
9b224c5e PA |
1098 | |
1099 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1100 | lwp->stop_expected = 0; |
ae13219e DJ |
1101 | } |
1102 | ||
1103 | /* Flush any pending changes to the process's registers. */ | |
3aee8918 | 1104 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
ae13219e | 1105 | |
9b224c5e PA |
1106 | /* Pass on any pending signal for this thread. */ |
1107 | sig = get_detach_signal (thread); | |
1108 | ||
ae13219e | 1109 | /* Finally, let it resume. */ |
82bfbe7e PA |
1110 | if (the_low_target.prepare_to_resume != NULL) |
1111 | the_low_target.prepare_to_resume (lwp); | |
b8e1b30e LM |
1112 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
1113 | (PTRACE_TYPE_ARG4) (long) sig) < 0) | |
9b224c5e PA |
1114 | error (_("Can't detach %s: %s"), |
1115 | target_pid_to_str (ptid_of (lwp)), | |
1116 | strerror (errno)); | |
bd99dc85 PA |
1117 | |
1118 | delete_lwp (lwp); | |
95954743 | 1119 | return 0; |
6ad8ae5c DJ |
1120 | } |
1121 | ||
95954743 PA |
1122 | static int |
1123 | linux_detach (int pid) | |
1124 | { | |
1125 | struct process_info *process; | |
1126 | ||
1127 | process = find_process_pid (pid); | |
1128 | if (process == NULL) | |
1129 | return -1; | |
1130 | ||
f9e39928 PA |
1131 | /* Stop all threads before detaching. First, ptrace requires that |
1132 | the thread is stopped to sucessfully detach. Second, thread_db | |
1133 | may need to uninstall thread event breakpoints from memory, which | |
1134 | only works with a stopped process anyway. */ | |
7984d532 | 1135 | stop_all_lwps (0, NULL); |
f9e39928 | 1136 | |
ca5c370d | 1137 | #ifdef USE_THREAD_DB |
8336d594 | 1138 | thread_db_detach (process); |
ca5c370d PA |
1139 | #endif |
1140 | ||
fa593d66 PA |
1141 | /* Stabilize threads (move out of jump pads). */ |
1142 | stabilize_threads (); | |
1143 | ||
95954743 | 1144 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1145 | |
1146 | the_target->mourn (process); | |
f9e39928 PA |
1147 | |
1148 | /* Since we presently can only stop all lwps of all processes, we | |
1149 | need to unstop lwps of other processes. */ | |
7984d532 | 1150 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1151 | return 0; |
1152 | } | |
1153 | ||
1154 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1155 | ||
1156 | static int | |
1157 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1158 | { | |
1159 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1160 | struct process_info *process = proc; | |
1161 | ||
1162 | if (pid_of (lwp) == pid_of (process)) | |
1163 | delete_lwp (lwp); | |
1164 | ||
dd6953e1 | 1165 | return 0; |
6ad8ae5c DJ |
1166 | } |
1167 | ||
8336d594 PA |
1168 | static void |
1169 | linux_mourn (struct process_info *process) | |
1170 | { | |
1171 | struct process_info_private *priv; | |
1172 | ||
1173 | #ifdef USE_THREAD_DB | |
1174 | thread_db_mourn (process); | |
1175 | #endif | |
1176 | ||
f9e39928 PA |
1177 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1178 | ||
8336d594 PA |
1179 | /* Freeing all private data. */ |
1180 | priv = process->private; | |
1181 | free (priv->arch_private); | |
1182 | free (priv); | |
1183 | process->private = NULL; | |
505106cd PA |
1184 | |
1185 | remove_process (process); | |
8336d594 PA |
1186 | } |
1187 | ||
444d6139 | 1188 | static void |
95954743 | 1189 | linux_join (int pid) |
444d6139 | 1190 | { |
444d6139 PA |
1191 | int status, ret; |
1192 | ||
1193 | do { | |
95954743 | 1194 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1195 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1196 | break; | |
1197 | } while (ret != -1 || errno != ECHILD); | |
1198 | } | |
1199 | ||
6ad8ae5c | 1200 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1201 | static int |
95954743 | 1202 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1203 | { |
95954743 PA |
1204 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1205 | ||
1206 | /* We assume we always know if a thread exits. If a whole process | |
1207 | exited but we still haven't been able to report it to GDB, we'll | |
1208 | hold on to the last lwp of the dead process. */ | |
1209 | if (lwp != NULL) | |
1210 | return !lwp->dead; | |
0d62e5e8 DJ |
1211 | else |
1212 | return 0; | |
1213 | } | |
1214 | ||
6bf5e0ba | 1215 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1216 | static int |
d50171e4 | 1217 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1218 | { |
54a0b537 | 1219 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1220 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1221 | struct thread_info *thread; |
95954743 PA |
1222 | |
1223 | /* Check if we're only interested in events from a specific process | |
1224 | or its lwps. */ | |
1225 | if (!ptid_equal (minus_one_ptid, ptid) | |
80894984 | 1226 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->entry.id)) |
95954743 | 1227 | return 0; |
0d62e5e8 | 1228 | |
d50171e4 PA |
1229 | thread = get_lwp_thread (lwp); |
1230 | ||
1231 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1232 | report any status pending the LWP may have. */ | |
8336d594 | 1233 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1234 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1235 | return 0; |
0d62e5e8 | 1236 | |
d50171e4 | 1237 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1238 | } |
1239 | ||
95954743 PA |
1240 | static int |
1241 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1242 | { | |
1243 | ptid_t ptid = *(ptid_t *) data; | |
1244 | int lwp; | |
1245 | ||
1246 | if (ptid_get_lwp (ptid) != 0) | |
1247 | lwp = ptid_get_lwp (ptid); | |
1248 | else | |
1249 | lwp = ptid_get_pid (ptid); | |
1250 | ||
1251 | if (ptid_get_lwp (entry->id) == lwp) | |
1252 | return 1; | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | struct lwp_info * | |
1258 | find_lwp_pid (ptid_t ptid) | |
1259 | { | |
1260 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1261 | } | |
1262 | ||
bd99dc85 | 1263 | static struct lwp_info * |
95954743 | 1264 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1265 | { |
0d62e5e8 | 1266 | int ret; |
95954743 | 1267 | int to_wait_for = -1; |
bd99dc85 | 1268 | struct lwp_info *child = NULL; |
0d62e5e8 | 1269 | |
bd99dc85 | 1270 | if (debug_threads) |
87ce2a04 | 1271 | debug_printf ("linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
95954743 PA |
1272 | |
1273 | if (ptid_equal (ptid, minus_one_ptid)) | |
1274 | to_wait_for = -1; /* any child */ | |
1275 | else | |
1276 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1277 | |
bd99dc85 | 1278 | options |= __WALL; |
0d62e5e8 | 1279 | |
bd99dc85 | 1280 | retry: |
0d62e5e8 | 1281 | |
bd99dc85 PA |
1282 | ret = my_waitpid (to_wait_for, wstatp, options); |
1283 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1284 | return NULL; | |
1285 | else if (ret == -1) | |
1286 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1287 | |
1288 | if (debug_threads | |
1289 | && (!WIFSTOPPED (*wstatp) | |
1290 | || (WSTOPSIG (*wstatp) != 32 | |
1291 | && WSTOPSIG (*wstatp) != 33))) | |
87ce2a04 | 1292 | debug_printf ("Got an event from %d (%x)\n", ret, *wstatp); |
0d62e5e8 | 1293 | |
95954743 | 1294 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1295 | |
24a09b5f DJ |
1296 | /* If we didn't find a process, one of two things presumably happened: |
1297 | - A process we started and then detached from has exited. Ignore it. | |
1298 | - A process we are controlling has forked and the new child's stop | |
1299 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1300 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1301 | { |
05044653 | 1302 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1303 | goto retry; |
1304 | } | |
bd99dc85 | 1305 | else if (child == NULL) |
24a09b5f DJ |
1306 | goto retry; |
1307 | ||
bd99dc85 | 1308 | child->stopped = 1; |
0d62e5e8 | 1309 | |
bd99dc85 | 1310 | child->last_status = *wstatp; |
32ca6d61 | 1311 | |
3aee8918 | 1312 | if (WIFSTOPPED (*wstatp)) |
d61ddec4 | 1313 | { |
3aee8918 PA |
1314 | struct process_info *proc; |
1315 | ||
1316 | /* Architecture-specific setup after inferior is running. This | |
1317 | needs to happen after we have attached to the inferior and it | |
1318 | is stopped for the first time, but before we access any | |
1319 | inferior registers. */ | |
1320 | proc = find_process_pid (pid_of (child)); | |
1321 | if (proc->private->new_inferior) | |
1322 | { | |
1323 | struct thread_info *saved_inferior; | |
1324 | ||
1325 | saved_inferior = current_inferior; | |
1326 | current_inferior = get_lwp_thread (child); | |
1327 | ||
1328 | the_low_target.arch_setup (); | |
1329 | ||
1330 | current_inferior = saved_inferior; | |
1331 | ||
1332 | proc->private->new_inferior = 0; | |
1333 | } | |
d61ddec4 UW |
1334 | } |
1335 | ||
c3adc08c PA |
1336 | /* Fetch the possibly triggered data watchpoint info and store it in |
1337 | CHILD. | |
1338 | ||
1339 | On some archs, like x86, that use debug registers to set | |
1340 | watchpoints, it's possible that the way to know which watched | |
1341 | address trapped, is to check the register that is used to select | |
1342 | which address to watch. Problem is, between setting the | |
1343 | watchpoint and reading back which data address trapped, the user | |
1344 | may change the set of watchpoints, and, as a consequence, GDB | |
1345 | changes the debug registers in the inferior. To avoid reading | |
1346 | back a stale stopped-data-address when that happens, we cache in | |
1347 | LP the fact that a watchpoint trapped, and the corresponding data | |
1348 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1349 | changes the debug registers meanwhile, we have the cached data we | |
1350 | can rely on. */ | |
1351 | ||
1352 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1353 | { | |
1354 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1355 | { | |
1356 | child->stopped_by_watchpoint = 0; | |
1357 | } | |
1358 | else | |
1359 | { | |
1360 | struct thread_info *saved_inferior; | |
1361 | ||
1362 | saved_inferior = current_inferior; | |
1363 | current_inferior = get_lwp_thread (child); | |
1364 | ||
1365 | child->stopped_by_watchpoint | |
1366 | = the_low_target.stopped_by_watchpoint (); | |
1367 | ||
1368 | if (child->stopped_by_watchpoint) | |
1369 | { | |
1370 | if (the_low_target.stopped_data_address != NULL) | |
1371 | child->stopped_data_address | |
1372 | = the_low_target.stopped_data_address (); | |
1373 | else | |
1374 | child->stopped_data_address = 0; | |
1375 | } | |
1376 | ||
1377 | current_inferior = saved_inferior; | |
1378 | } | |
1379 | } | |
1380 | ||
d50171e4 PA |
1381 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1382 | architecture being defined already (so that CHILD has a valid | |
1383 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1384 | not). */ | |
1385 | if (WIFSTOPPED (*wstatp)) | |
1386 | child->stop_pc = get_stop_pc (child); | |
1387 | ||
0d62e5e8 | 1388 | if (debug_threads |
47c0c975 DE |
1389 | && WIFSTOPPED (*wstatp) |
1390 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1391 | { |
896c7fbb | 1392 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1393 | struct regcache *regcache; |
47c0c975 DE |
1394 | CORE_ADDR pc; |
1395 | ||
d50171e4 | 1396 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1397 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1398 | pc = (*the_low_target.get_pc) (regcache); |
87ce2a04 | 1399 | debug_printf ("linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1400 | current_inferior = saved_inferior; |
0d62e5e8 | 1401 | } |
bd99dc85 PA |
1402 | |
1403 | return child; | |
0d62e5e8 | 1404 | } |
611cb4a5 | 1405 | |
219f2f23 PA |
1406 | /* This function should only be called if the LWP got a SIGTRAP. |
1407 | ||
1408 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1409 | event was handled, 0 otherwise. */ | |
1410 | ||
1411 | static int | |
1412 | handle_tracepoints (struct lwp_info *lwp) | |
1413 | { | |
1414 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1415 | int tpoint_related_event = 0; | |
1416 | ||
7984d532 PA |
1417 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1418 | uninsert tracepoints. To do this, we temporarily pause all | |
1419 | threads, unpatch away, and then unpause threads. We need to make | |
1420 | sure the unpausing doesn't resume LWP too. */ | |
1421 | lwp->suspended++; | |
1422 | ||
219f2f23 PA |
1423 | /* And we need to be sure that any all-threads-stopping doesn't try |
1424 | to move threads out of the jump pads, as it could deadlock the | |
1425 | inferior (LWP could be in the jump pad, maybe even holding the | |
1426 | lock.) */ | |
1427 | ||
1428 | /* Do any necessary step collect actions. */ | |
1429 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1430 | ||
fa593d66 PA |
1431 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1432 | ||
219f2f23 PA |
1433 | /* See if we just hit a tracepoint and do its main collect |
1434 | actions. */ | |
1435 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1436 | ||
7984d532 PA |
1437 | lwp->suspended--; |
1438 | ||
1439 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1440 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1441 | |
219f2f23 PA |
1442 | if (tpoint_related_event) |
1443 | { | |
1444 | if (debug_threads) | |
87ce2a04 | 1445 | debug_printf ("got a tracepoint event\n"); |
219f2f23 PA |
1446 | return 1; |
1447 | } | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
fa593d66 PA |
1452 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1453 | fast tracepoint. */ | |
1454 | ||
1455 | static int | |
1456 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1457 | struct fast_tpoint_collect_status *status) | |
1458 | { | |
1459 | CORE_ADDR thread_area; | |
1460 | ||
1461 | if (the_low_target.get_thread_area == NULL) | |
1462 | return 0; | |
1463 | ||
1464 | /* Get the thread area address. This is used to recognize which | |
1465 | thread is which when tracing with the in-process agent library. | |
1466 | We don't read anything from the address, and treat it as opaque; | |
1467 | it's the address itself that we assume is unique per-thread. */ | |
1468 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1469 | return 0; | |
1470 | ||
1471 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1472 | } | |
1473 | ||
1474 | /* The reason we resume in the caller, is because we want to be able | |
1475 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1476 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1477 | refuses to resume. */ | |
1478 | ||
1479 | static int | |
1480 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1481 | { | |
1482 | struct thread_info *saved_inferior; | |
1483 | ||
1484 | saved_inferior = current_inferior; | |
1485 | current_inferior = get_lwp_thread (lwp); | |
1486 | ||
1487 | if ((wstat == NULL | |
1488 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1489 | && supports_fast_tracepoints () | |
58b4daa5 | 1490 | && agent_loaded_p ()) |
fa593d66 PA |
1491 | { |
1492 | struct fast_tpoint_collect_status status; | |
1493 | int r; | |
1494 | ||
1495 | if (debug_threads) | |
87ce2a04 DE |
1496 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1497 | "jump pad.\n", | |
1498 | lwpid_of (lwp)); | |
fa593d66 PA |
1499 | |
1500 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1501 | ||
1502 | if (wstat == NULL | |
1503 | || (WSTOPSIG (*wstat) != SIGILL | |
1504 | && WSTOPSIG (*wstat) != SIGFPE | |
1505 | && WSTOPSIG (*wstat) != SIGSEGV | |
1506 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1507 | { | |
1508 | lwp->collecting_fast_tracepoint = r; | |
1509 | ||
1510 | if (r != 0) | |
1511 | { | |
1512 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1513 | { | |
1514 | /* Haven't executed the original instruction yet. | |
1515 | Set breakpoint there, and wait till it's hit, | |
1516 | then single-step until exiting the jump pad. */ | |
1517 | lwp->exit_jump_pad_bkpt | |
1518 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1519 | } | |
1520 | ||
1521 | if (debug_threads) | |
87ce2a04 DE |
1522 | debug_printf ("Checking whether LWP %ld needs to move out of " |
1523 | "the jump pad...it does\n", | |
1524 | lwpid_of (lwp)); | |
0cccb683 | 1525 | current_inferior = saved_inferior; |
fa593d66 PA |
1526 | |
1527 | return 1; | |
1528 | } | |
1529 | } | |
1530 | else | |
1531 | { | |
1532 | /* If we get a synchronous signal while collecting, *and* | |
1533 | while executing the (relocated) original instruction, | |
1534 | reset the PC to point at the tpoint address, before | |
1535 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1536 | report the signal to GDB, and pray for the best. */ | |
1537 | ||
1538 | lwp->collecting_fast_tracepoint = 0; | |
1539 | ||
1540 | if (r != 0 | |
1541 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1542 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1543 | { | |
1544 | siginfo_t info; | |
1545 | struct regcache *regcache; | |
1546 | ||
1547 | /* The si_addr on a few signals references the address | |
1548 | of the faulting instruction. Adjust that as | |
1549 | well. */ | |
1550 | if ((WSTOPSIG (*wstat) == SIGILL | |
1551 | || WSTOPSIG (*wstat) == SIGFPE | |
1552 | || WSTOPSIG (*wstat) == SIGBUS | |
1553 | || WSTOPSIG (*wstat) == SIGSEGV) | |
56f7af9c | 1554 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), |
b8e1b30e | 1555 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1556 | /* Final check just to make sure we don't clobber |
1557 | the siginfo of non-kernel-sent signals. */ | |
1558 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1559 | { | |
1560 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
56f7af9c | 1561 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), |
b8e1b30e | 1562 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1563 | } |
1564 | ||
1565 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1566 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1567 | lwp->stop_pc = status.tpoint_addr; | |
1568 | ||
1569 | /* Cancel any fast tracepoint lock this thread was | |
1570 | holding. */ | |
1571 | force_unlock_trace_buffer (); | |
1572 | } | |
1573 | ||
1574 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1575 | { | |
1576 | if (debug_threads) | |
87ce2a04 DE |
1577 | debug_printf ("Cancelling fast exit-jump-pad: removing bkpt. " |
1578 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
1579 | |
1580 | stop_all_lwps (1, lwp); | |
1581 | cancel_breakpoints (); | |
1582 | ||
1583 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1584 | lwp->exit_jump_pad_bkpt = NULL; | |
1585 | ||
1586 | unstop_all_lwps (1, lwp); | |
1587 | ||
1588 | gdb_assert (lwp->suspended >= 0); | |
1589 | } | |
1590 | } | |
1591 | } | |
1592 | ||
1593 | if (debug_threads) | |
87ce2a04 DE |
1594 | debug_printf ("Checking whether LWP %ld needs to move out of the " |
1595 | "jump pad...no\n", | |
1596 | lwpid_of (lwp)); | |
0cccb683 YQ |
1597 | |
1598 | current_inferior = saved_inferior; | |
fa593d66 PA |
1599 | return 0; |
1600 | } | |
1601 | ||
1602 | /* Enqueue one signal in the "signals to report later when out of the | |
1603 | jump pad" list. */ | |
1604 | ||
1605 | static void | |
1606 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1607 | { | |
1608 | struct pending_signals *p_sig; | |
1609 | ||
1610 | if (debug_threads) | |
87ce2a04 DE |
1611 | debug_printf ("Deferring signal %d for LWP %ld.\n", |
1612 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
fa593d66 PA |
1613 | |
1614 | if (debug_threads) | |
1615 | { | |
1616 | struct pending_signals *sig; | |
1617 | ||
1618 | for (sig = lwp->pending_signals_to_report; | |
1619 | sig != NULL; | |
1620 | sig = sig->prev) | |
87ce2a04 DE |
1621 | debug_printf (" Already queued %d\n", |
1622 | sig->signal); | |
fa593d66 | 1623 | |
87ce2a04 | 1624 | debug_printf (" (no more currently queued signals)\n"); |
fa593d66 PA |
1625 | } |
1626 | ||
1a981360 PA |
1627 | /* Don't enqueue non-RT signals if they are already in the deferred |
1628 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1629 | twice) */ | |
1630 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1631 | { | |
1632 | struct pending_signals *sig; | |
1633 | ||
1634 | for (sig = lwp->pending_signals_to_report; | |
1635 | sig != NULL; | |
1636 | sig = sig->prev) | |
1637 | { | |
1638 | if (sig->signal == WSTOPSIG (*wstat)) | |
1639 | { | |
1640 | if (debug_threads) | |
87ce2a04 DE |
1641 | debug_printf ("Not requeuing already queued non-RT signal %d" |
1642 | " for LWP %ld\n", | |
1643 | sig->signal, | |
1644 | lwpid_of (lwp)); | |
1a981360 PA |
1645 | return; |
1646 | } | |
1647 | } | |
1648 | } | |
1649 | ||
fa593d66 PA |
1650 | p_sig = xmalloc (sizeof (*p_sig)); |
1651 | p_sig->prev = lwp->pending_signals_to_report; | |
1652 | p_sig->signal = WSTOPSIG (*wstat); | |
1653 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
b8e1b30e | 1654 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1655 | &p_sig->info); |
fa593d66 PA |
1656 | |
1657 | lwp->pending_signals_to_report = p_sig; | |
1658 | } | |
1659 | ||
1660 | /* Dequeue one signal from the "signals to report later when out of | |
1661 | the jump pad" list. */ | |
1662 | ||
1663 | static int | |
1664 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1665 | { | |
1666 | if (lwp->pending_signals_to_report != NULL) | |
1667 | { | |
1668 | struct pending_signals **p_sig; | |
1669 | ||
1670 | p_sig = &lwp->pending_signals_to_report; | |
1671 | while ((*p_sig)->prev != NULL) | |
1672 | p_sig = &(*p_sig)->prev; | |
1673 | ||
1674 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1675 | if ((*p_sig)->info.si_signo != 0) | |
b8e1b30e | 1676 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1677 | &(*p_sig)->info); |
fa593d66 PA |
1678 | free (*p_sig); |
1679 | *p_sig = NULL; | |
1680 | ||
1681 | if (debug_threads) | |
87ce2a04 DE |
1682 | debug_printf ("Reporting deferred signal %d for LWP %ld.\n", |
1683 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
fa593d66 PA |
1684 | |
1685 | if (debug_threads) | |
1686 | { | |
1687 | struct pending_signals *sig; | |
1688 | ||
1689 | for (sig = lwp->pending_signals_to_report; | |
1690 | sig != NULL; | |
1691 | sig = sig->prev) | |
87ce2a04 DE |
1692 | debug_printf (" Still queued %d\n", |
1693 | sig->signal); | |
fa593d66 | 1694 | |
87ce2a04 | 1695 | debug_printf (" (no more queued signals)\n"); |
fa593d66 PA |
1696 | } |
1697 | ||
1698 | return 1; | |
1699 | } | |
1700 | ||
1701 | return 0; | |
1702 | } | |
1703 | ||
d50171e4 PA |
1704 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1705 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1706 | will handle the current event, eventually we will resume this LWP, | |
1707 | and this breakpoint will trap again. */ | |
1708 | ||
1709 | static int | |
1710 | cancel_breakpoint (struct lwp_info *lwp) | |
1711 | { | |
1712 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1713 | |
1714 | /* There's nothing to do if we don't support breakpoints. */ | |
1715 | if (!supports_breakpoints ()) | |
1716 | return 0; | |
1717 | ||
d50171e4 PA |
1718 | /* breakpoint_at reads from current inferior. */ |
1719 | saved_inferior = current_inferior; | |
1720 | current_inferior = get_lwp_thread (lwp); | |
1721 | ||
1722 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1723 | { | |
1724 | if (debug_threads) | |
87ce2a04 DE |
1725 | debug_printf ("CB: Push back breakpoint for %s\n", |
1726 | target_pid_to_str (ptid_of (lwp))); | |
d50171e4 PA |
1727 | |
1728 | /* Back up the PC if necessary. */ | |
1729 | if (the_low_target.decr_pc_after_break) | |
1730 | { | |
1731 | struct regcache *regcache | |
fc7238bb | 1732 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1733 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1734 | } | |
1735 | ||
1736 | current_inferior = saved_inferior; | |
1737 | return 1; | |
1738 | } | |
1739 | else | |
1740 | { | |
1741 | if (debug_threads) | |
87ce2a04 DE |
1742 | debug_printf ("CB: No breakpoint found at %s for [%s]\n", |
1743 | paddress (lwp->stop_pc), | |
1744 | target_pid_to_str (ptid_of (lwp))); | |
d50171e4 PA |
1745 | } |
1746 | ||
1747 | current_inferior = saved_inferior; | |
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | /* When the event-loop is doing a step-over, this points at the thread | |
1752 | being stepped. */ | |
1753 | ptid_t step_over_bkpt; | |
1754 | ||
bd99dc85 PA |
1755 | /* Wait for an event from child PID. If PID is -1, wait for any |
1756 | child. Store the stop status through the status pointer WSTAT. | |
1757 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1758 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
ee1e2d4f | 1759 | the stopped child and update current_inferior otherwise. */ |
bd99dc85 | 1760 | |
0d62e5e8 | 1761 | static int |
d8301ad1 | 1762 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1763 | { |
d50171e4 | 1764 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1765 | ptid_t wait_ptid; |
d50171e4 | 1766 | |
d50171e4 PA |
1767 | event_child = NULL; |
1768 | requested_child = NULL; | |
0d62e5e8 | 1769 | |
95954743 | 1770 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1771 | |
e825046f | 1772 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1773 | { |
54a0b537 | 1774 | event_child = (struct lwp_info *) |
d50171e4 | 1775 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1776 | if (debug_threads && event_child) |
87ce2a04 | 1777 | debug_printf ("Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1778 | } |
1779 | else | |
1780 | { | |
95954743 | 1781 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1782 | |
bde24c0a | 1783 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1784 | && requested_child->status_pending_p |
1785 | && requested_child->collecting_fast_tracepoint) | |
1786 | { | |
1787 | enqueue_one_deferred_signal (requested_child, | |
1788 | &requested_child->status_pending); | |
1789 | requested_child->status_pending_p = 0; | |
1790 | requested_child->status_pending = 0; | |
1791 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1792 | } | |
1793 | ||
1794 | if (requested_child->suspended | |
1795 | && requested_child->status_pending_p) | |
1796 | fatal ("requesting an event out of a suspended child?"); | |
1797 | ||
d50171e4 | 1798 | if (requested_child->status_pending_p) |
bd99dc85 | 1799 | event_child = requested_child; |
0d62e5e8 | 1800 | } |
611cb4a5 | 1801 | |
0d62e5e8 DJ |
1802 | if (event_child != NULL) |
1803 | { | |
bd99dc85 | 1804 | if (debug_threads) |
87ce2a04 DE |
1805 | debug_printf ("Got an event from pending child %ld (%04x)\n", |
1806 | lwpid_of (event_child), event_child->status_pending); | |
bd99dc85 PA |
1807 | *wstat = event_child->status_pending; |
1808 | event_child->status_pending_p = 0; | |
1809 | event_child->status_pending = 0; | |
1810 | current_inferior = get_lwp_thread (event_child); | |
1811 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1812 | } |
1813 | ||
d8301ad1 JK |
1814 | if (ptid_is_pid (ptid)) |
1815 | { | |
1816 | /* A request to wait for a specific tgid. This is not possible | |
1817 | with waitpid, so instead, we wait for any child, and leave | |
1818 | children we're not interested in right now with a pending | |
1819 | status to report later. */ | |
1820 | wait_ptid = minus_one_ptid; | |
1821 | } | |
1822 | else | |
1823 | wait_ptid = ptid; | |
1824 | ||
0d62e5e8 DJ |
1825 | /* We only enter this loop if no process has a pending wait status. Thus |
1826 | any action taken in response to a wait status inside this loop is | |
1827 | responding as soon as we detect the status, not after any pending | |
1828 | events. */ | |
1829 | while (1) | |
1830 | { | |
d8301ad1 | 1831 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1832 | |
bd99dc85 | 1833 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1834 | { |
1835 | if (debug_threads) | |
87ce2a04 | 1836 | debug_printf ("WNOHANG set, no event found\n"); |
d50171e4 PA |
1837 | return 0; |
1838 | } | |
0d62e5e8 DJ |
1839 | |
1840 | if (event_child == NULL) | |
1841 | error ("event from unknown child"); | |
611cb4a5 | 1842 | |
d8301ad1 JK |
1843 | if (ptid_is_pid (ptid) |
1844 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1845 | { | |
1846 | if (! WIFSTOPPED (*wstat)) | |
1847 | mark_lwp_dead (event_child, *wstat); | |
1848 | else | |
1849 | { | |
1850 | event_child->status_pending_p = 1; | |
1851 | event_child->status_pending = *wstat; | |
1852 | } | |
1853 | continue; | |
1854 | } | |
1855 | ||
bd99dc85 | 1856 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1857 | |
89be2091 | 1858 | /* Check for thread exit. */ |
bd99dc85 | 1859 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1860 | { |
89be2091 | 1861 | if (debug_threads) |
87ce2a04 | 1862 | debug_printf ("LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1863 | |
1864 | /* If the last thread is exiting, just return. */ | |
95954743 | 1865 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1866 | { |
1867 | if (debug_threads) | |
87ce2a04 DE |
1868 | debug_printf ("LWP %ld is last lwp of process\n", |
1869 | lwpid_of (event_child)); | |
bd99dc85 PA |
1870 | return lwpid_of (event_child); |
1871 | } | |
89be2091 | 1872 | |
bd99dc85 PA |
1873 | if (!non_stop) |
1874 | { | |
649ebbca | 1875 | current_inferior = get_first_thread (); |
bd99dc85 | 1876 | if (debug_threads) |
87ce2a04 DE |
1877 | debug_printf ("Current inferior is now %ld\n", |
1878 | lwpid_of (get_thread_lwp (current_inferior))); | |
bd99dc85 PA |
1879 | } |
1880 | else | |
1881 | { | |
1882 | current_inferior = NULL; | |
1883 | if (debug_threads) | |
87ce2a04 | 1884 | debug_printf ("Current inferior is now <NULL>\n"); |
bd99dc85 | 1885 | } |
89be2091 DJ |
1886 | |
1887 | /* If we were waiting for this particular child to do something... | |
1888 | well, it did something. */ | |
bd99dc85 | 1889 | if (requested_child != NULL) |
d50171e4 PA |
1890 | { |
1891 | int lwpid = lwpid_of (event_child); | |
1892 | ||
1893 | /* Cancel the step-over operation --- the thread that | |
1894 | started it is gone. */ | |
1895 | if (finish_step_over (event_child)) | |
7984d532 | 1896 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1897 | delete_lwp (event_child); |
1898 | return lwpid; | |
1899 | } | |
1900 | ||
1901 | delete_lwp (event_child); | |
89be2091 DJ |
1902 | |
1903 | /* Wait for a more interesting event. */ | |
1904 | continue; | |
1905 | } | |
1906 | ||
a6dbe5df PA |
1907 | if (event_child->must_set_ptrace_flags) |
1908 | { | |
1e7fc18c | 1909 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1910 | event_child->must_set_ptrace_flags = 0; |
1911 | } | |
1912 | ||
bd99dc85 PA |
1913 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1914 | && *wstat >> 16 != 0) | |
24a09b5f | 1915 | { |
bd99dc85 | 1916 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1917 | continue; |
1918 | } | |
1919 | ||
d50171e4 PA |
1920 | if (WIFSTOPPED (*wstat) |
1921 | && WSTOPSIG (*wstat) == SIGSTOP | |
1922 | && event_child->stop_expected) | |
1923 | { | |
1924 | int should_stop; | |
1925 | ||
1926 | if (debug_threads) | |
87ce2a04 | 1927 | debug_printf ("Expected stop.\n"); |
d50171e4 PA |
1928 | event_child->stop_expected = 0; |
1929 | ||
8336d594 | 1930 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 1931 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
1932 | |
1933 | if (!should_stop) | |
1934 | { | |
1935 | linux_resume_one_lwp (event_child, | |
1936 | event_child->stepping, 0, NULL); | |
1937 | continue; | |
1938 | } | |
1939 | } | |
1940 | ||
bd99dc85 | 1941 | return lwpid_of (event_child); |
611cb4a5 | 1942 | } |
0d62e5e8 | 1943 | |
611cb4a5 DJ |
1944 | /* NOTREACHED */ |
1945 | return 0; | |
1946 | } | |
1947 | ||
6bf5e0ba PA |
1948 | /* Count the LWP's that have had events. */ |
1949 | ||
1950 | static int | |
1951 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1952 | { | |
1953 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1954 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1955 | int *count = data; |
1956 | ||
1957 | gdb_assert (count != NULL); | |
1958 | ||
1959 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1960 | should be reported to GDB. */ | |
8336d594 PA |
1961 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1962 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1963 | && lp->status_pending_p |
1964 | && WIFSTOPPED (lp->status_pending) | |
1965 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1966 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1967 | (*count)++; | |
1968 | ||
1969 | return 0; | |
1970 | } | |
1971 | ||
1972 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1973 | ||
1974 | static int | |
1975 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1976 | { | |
1977 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1978 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1979 | |
8336d594 PA |
1980 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1981 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1982 | && lp->status_pending_p) |
1983 | return 1; | |
1984 | else | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1989 | reported to GDB. */ | |
1990 | ||
1991 | static int | |
1992 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1993 | { | |
1994 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1995 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1996 | int *selector = data; |
1997 | ||
1998 | gdb_assert (selector != NULL); | |
1999 | ||
2000 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2001 | if (thread->last_resume_kind != resume_stop |
2002 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2003 | && lp->status_pending_p |
2004 | && WIFSTOPPED (lp->status_pending) | |
2005 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2006 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2007 | if ((*selector)-- == 0) | |
2008 | return 1; | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | static int | |
2014 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2015 | { | |
2016 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2017 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2018 | struct lwp_info *event_lp = data; |
2019 | ||
2020 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2021 | if (lp == event_lp) | |
2022 | return 0; | |
2023 | ||
2024 | /* If a LWP other than the LWP that we're reporting an event for has | |
2025 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2026 | then just arrange for it to hit it again later. We don't keep | |
2027 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2028 | LWP. We will handle the current event, eventually we will resume | |
2029 | all LWPs, and this one will get its breakpoint trap again. | |
2030 | ||
2031 | If we do not do this, then we run the risk that the user will | |
2032 | delete or disable the breakpoint, but the LWP will have already | |
2033 | tripped on it. */ | |
2034 | ||
8336d594 PA |
2035 | if (thread->last_resume_kind != resume_stop |
2036 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2037 | && lp->status_pending_p |
2038 | && WIFSTOPPED (lp->status_pending) | |
2039 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2040 | && !lp->stepping |
2041 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2042 | && cancel_breakpoint (lp)) |
2043 | /* Throw away the SIGTRAP. */ | |
2044 | lp->status_pending_p = 0; | |
2045 | ||
2046 | return 0; | |
2047 | } | |
2048 | ||
7984d532 PA |
2049 | static void |
2050 | linux_cancel_breakpoints (void) | |
2051 | { | |
2052 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2053 | } | |
2054 | ||
6bf5e0ba PA |
2055 | /* Select one LWP out of those that have events pending. */ |
2056 | ||
2057 | static void | |
2058 | select_event_lwp (struct lwp_info **orig_lp) | |
2059 | { | |
2060 | int num_events = 0; | |
2061 | int random_selector; | |
2062 | struct lwp_info *event_lp; | |
2063 | ||
2064 | /* Give preference to any LWP that is being single-stepped. */ | |
2065 | event_lp | |
2066 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2067 | select_singlestep_lwp_callback, NULL); | |
2068 | if (event_lp != NULL) | |
2069 | { | |
2070 | if (debug_threads) | |
87ce2a04 DE |
2071 | debug_printf ("SEL: Select single-step %s\n", |
2072 | target_pid_to_str (ptid_of (event_lp))); | |
6bf5e0ba PA |
2073 | } |
2074 | else | |
2075 | { | |
2076 | /* No single-stepping LWP. Select one at random, out of those | |
2077 | which have had SIGTRAP events. */ | |
2078 | ||
2079 | /* First see how many SIGTRAP events we have. */ | |
2080 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2081 | ||
2082 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2083 | random_selector = (int) | |
2084 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2085 | ||
2086 | if (debug_threads && num_events > 1) | |
87ce2a04 DE |
2087 | debug_printf ("SEL: Found %d SIGTRAP events, selecting #%d\n", |
2088 | num_events, random_selector); | |
6bf5e0ba PA |
2089 | |
2090 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2091 | select_event_lwp_callback, | |
2092 | &random_selector); | |
2093 | } | |
2094 | ||
2095 | if (event_lp != NULL) | |
2096 | { | |
2097 | /* Switch the event LWP. */ | |
2098 | *orig_lp = event_lp; | |
2099 | } | |
2100 | } | |
2101 | ||
7984d532 PA |
2102 | /* Decrement the suspend count of an LWP. */ |
2103 | ||
2104 | static int | |
2105 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2106 | { | |
2107 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2108 | ||
2109 | /* Ignore EXCEPT. */ | |
2110 | if (lwp == except) | |
2111 | return 0; | |
2112 | ||
2113 | lwp->suspended--; | |
2114 | ||
2115 | gdb_assert (lwp->suspended >= 0); | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2120 | NULL. */ | |
2121 | ||
2122 | static void | |
2123 | unsuspend_all_lwps (struct lwp_info *except) | |
2124 | { | |
2125 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2126 | } | |
2127 | ||
fa593d66 PA |
2128 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2129 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2130 | void *data); | |
2131 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2132 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2133 | struct target_waitstatus *ourstatus, | |
2134 | int target_options); | |
2135 | ||
2136 | /* Stabilize threads (move out of jump pads). | |
2137 | ||
2138 | If a thread is midway collecting a fast tracepoint, we need to | |
2139 | finish the collection and move it out of the jump pad before | |
2140 | reporting the signal. | |
2141 | ||
2142 | This avoids recursion while collecting (when a signal arrives | |
2143 | midway, and the signal handler itself collects), which would trash | |
2144 | the trace buffer. In case the user set a breakpoint in a signal | |
2145 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2146 | Most importantly, there are certain things we can't do safely if | |
2147 | threads are stopped in a jump pad (or in its callee's). For | |
2148 | example: | |
2149 | ||
2150 | - starting a new trace run. A thread still collecting the | |
2151 | previous run, could trash the trace buffer when resumed. The trace | |
2152 | buffer control structures would have been reset but the thread had | |
2153 | no way to tell. The thread could even midway memcpy'ing to the | |
2154 | buffer, which would mean that when resumed, it would clobber the | |
2155 | trace buffer that had been set for a new run. | |
2156 | ||
2157 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2158 | safely. Say you do tstart while a thread is stopped midway while | |
2159 | collecting. When the thread is later resumed, it finishes the | |
2160 | collection, and returns to the jump pad, to execute the original | |
2161 | instruction that was under the tracepoint jump at the time the | |
2162 | older run had been started. If the jump pad had been rewritten | |
2163 | since for something else in the new run, the thread would now | |
2164 | execute the wrong / random instructions. */ | |
2165 | ||
2166 | static void | |
2167 | linux_stabilize_threads (void) | |
2168 | { | |
2169 | struct thread_info *save_inferior; | |
2170 | struct lwp_info *lwp_stuck; | |
2171 | ||
2172 | lwp_stuck | |
2173 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2174 | stuck_in_jump_pad_callback, NULL); | |
2175 | if (lwp_stuck != NULL) | |
2176 | { | |
b4d51a55 | 2177 | if (debug_threads) |
87ce2a04 DE |
2178 | debug_printf ("can't stabilize, LWP %ld is stuck in jump pad\n", |
2179 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2180 | return; |
2181 | } | |
2182 | ||
2183 | save_inferior = current_inferior; | |
2184 | ||
2185 | stabilizing_threads = 1; | |
2186 | ||
2187 | /* Kick 'em all. */ | |
2188 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2189 | ||
2190 | /* Loop until all are stopped out of the jump pads. */ | |
2191 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2192 | { | |
2193 | struct target_waitstatus ourstatus; | |
2194 | struct lwp_info *lwp; | |
fa593d66 PA |
2195 | int wstat; |
2196 | ||
2197 | /* Note that we go through the full wait even loop. While | |
2198 | moving threads out of jump pad, we need to be able to step | |
2199 | over internal breakpoints and such. */ | |
32fcada3 | 2200 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2201 | |
2202 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2203 | { | |
2204 | lwp = get_thread_lwp (current_inferior); | |
2205 | ||
2206 | /* Lock it. */ | |
2207 | lwp->suspended++; | |
2208 | ||
a493e3e2 | 2209 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2210 | || current_inferior->last_resume_kind == resume_stop) |
2211 | { | |
2ea28649 | 2212 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2213 | enqueue_one_deferred_signal (lwp, &wstat); |
2214 | } | |
2215 | } | |
2216 | } | |
2217 | ||
2218 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2219 | ||
2220 | stabilizing_threads = 0; | |
2221 | ||
2222 | current_inferior = save_inferior; | |
2223 | ||
b4d51a55 | 2224 | if (debug_threads) |
fa593d66 | 2225 | { |
b4d51a55 PA |
2226 | lwp_stuck |
2227 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2228 | stuck_in_jump_pad_callback, NULL); | |
2229 | if (lwp_stuck != NULL) | |
87ce2a04 DE |
2230 | debug_printf ("couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2231 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2232 | } |
2233 | } | |
2234 | ||
0d62e5e8 | 2235 | /* Wait for process, returns status. */ |
da6d8c04 | 2236 | |
95954743 PA |
2237 | static ptid_t |
2238 | linux_wait_1 (ptid_t ptid, | |
2239 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2240 | { |
e5f1222d | 2241 | int w; |
fc7238bb | 2242 | struct lwp_info *event_child; |
bd99dc85 | 2243 | int options; |
bd99dc85 | 2244 | int pid; |
6bf5e0ba PA |
2245 | int step_over_finished; |
2246 | int bp_explains_trap; | |
2247 | int maybe_internal_trap; | |
2248 | int report_to_gdb; | |
219f2f23 | 2249 | int trace_event; |
c2d6af84 | 2250 | int in_step_range; |
bd99dc85 | 2251 | |
87ce2a04 DE |
2252 | if (debug_threads) |
2253 | { | |
2254 | debug_enter (); | |
2255 | debug_printf ("linux_wait_1: [%s]\n", target_pid_to_str (ptid)); | |
2256 | } | |
2257 | ||
bd99dc85 PA |
2258 | /* Translate generic target options into linux options. */ |
2259 | options = __WALL; | |
2260 | if (target_options & TARGET_WNOHANG) | |
2261 | options |= WNOHANG; | |
0d62e5e8 DJ |
2262 | |
2263 | retry: | |
fa593d66 PA |
2264 | bp_explains_trap = 0; |
2265 | trace_event = 0; | |
c2d6af84 | 2266 | in_step_range = 0; |
bd99dc85 PA |
2267 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2268 | ||
0d62e5e8 DJ |
2269 | /* If we were only supposed to resume one thread, only wait for |
2270 | that thread - if it's still alive. If it died, however - which | |
2271 | can happen if we're coming from the thread death case below - | |
2272 | then we need to make sure we restart the other threads. We could | |
2273 | pick a thread at random or restart all; restarting all is less | |
2274 | arbitrary. */ | |
95954743 PA |
2275 | if (!non_stop |
2276 | && !ptid_equal (cont_thread, null_ptid) | |
2277 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2278 | { |
fc7238bb PA |
2279 | struct thread_info *thread; |
2280 | ||
bd99dc85 PA |
2281 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2282 | cont_thread); | |
0d62e5e8 DJ |
2283 | |
2284 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2285 | if (thread == NULL) |
64386c31 DJ |
2286 | { |
2287 | struct thread_resume resume_info; | |
95954743 | 2288 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2289 | resume_info.kind = resume_continue; |
2290 | resume_info.sig = 0; | |
2bd7c093 | 2291 | linux_resume (&resume_info, 1); |
64386c31 | 2292 | } |
bd99dc85 | 2293 | else |
95954743 | 2294 | ptid = cont_thread; |
0d62e5e8 | 2295 | } |
da6d8c04 | 2296 | |
6bf5e0ba PA |
2297 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2298 | pid = linux_wait_for_event (ptid, &w, options); | |
2299 | else | |
2300 | { | |
2301 | if (debug_threads) | |
87ce2a04 DE |
2302 | debug_printf ("step_over_bkpt set [%s], doing a blocking wait\n", |
2303 | target_pid_to_str (step_over_bkpt)); | |
6bf5e0ba PA |
2304 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); |
2305 | } | |
2306 | ||
bd99dc85 | 2307 | if (pid == 0) /* only if TARGET_WNOHANG */ |
87ce2a04 DE |
2308 | { |
2309 | if (debug_threads) | |
2310 | { | |
2311 | debug_printf ("linux_wait_1 ret = null_ptid\n"); | |
2312 | debug_exit (); | |
2313 | } | |
2314 | return null_ptid; | |
2315 | } | |
bd99dc85 | 2316 | |
6bf5e0ba | 2317 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2318 | |
0d62e5e8 DJ |
2319 | /* If we are waiting for a particular child, and it exited, |
2320 | linux_wait_for_event will return its exit status. Similarly if | |
2321 | the last child exited. If this is not the last child, however, | |
2322 | do not report it as exited until there is a 'thread exited' response | |
2323 | available in the remote protocol. Instead, just wait for another event. | |
2324 | This should be safe, because if the thread crashed we will already | |
2325 | have reported the termination signal to GDB; that should stop any | |
2326 | in-progress stepping operations, etc. | |
2327 | ||
2328 | Report the exit status of the last thread to exit. This matches | |
2329 | LinuxThreads' behavior. */ | |
2330 | ||
95954743 | 2331 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2332 | { |
bd99dc85 | 2333 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2334 | { |
bd99dc85 PA |
2335 | if (WIFEXITED (w)) |
2336 | { | |
2337 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2338 | ourstatus->value.integer = WEXITSTATUS (w); | |
2339 | ||
2340 | if (debug_threads) | |
87ce2a04 DE |
2341 | { |
2342 | debug_printf ("linux_wait_1 ret = %s, exited with " | |
2343 | "retcode %d\n", | |
2344 | target_pid_to_str (ptid_of (event_child)), | |
2345 | WEXITSTATUS (w)); | |
2346 | debug_exit (); | |
2347 | } | |
bd99dc85 PA |
2348 | } |
2349 | else | |
2350 | { | |
2351 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2352 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2353 | |
2354 | if (debug_threads) | |
87ce2a04 DE |
2355 | { |
2356 | debug_printf ("linux_wait_1 ret = %s, terminated with " | |
2357 | "signal %d\n", | |
2358 | target_pid_to_str (ptid_of (event_child)), | |
2359 | WTERMSIG (w)); | |
2360 | debug_exit (); | |
2361 | } | |
bd99dc85 | 2362 | } |
5b1c542e | 2363 | |
3e4c1235 | 2364 | return ptid_of (event_child); |
0d62e5e8 | 2365 | } |
da6d8c04 | 2366 | } |
0d62e5e8 | 2367 | else |
da6d8c04 | 2368 | { |
0d62e5e8 DJ |
2369 | if (!WIFSTOPPED (w)) |
2370 | goto retry; | |
da6d8c04 DJ |
2371 | } |
2372 | ||
6bf5e0ba PA |
2373 | /* If this event was not handled before, and is not a SIGTRAP, we |
2374 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2375 | a breakpoint is inserted at the current PC. If this target does | |
2376 | not support internal breakpoints at all, we also report the | |
2377 | SIGTRAP without further processing; it's of no concern to us. */ | |
2378 | maybe_internal_trap | |
2379 | = (supports_breakpoints () | |
2380 | && (WSTOPSIG (w) == SIGTRAP | |
2381 | || ((WSTOPSIG (w) == SIGILL | |
2382 | || WSTOPSIG (w) == SIGSEGV) | |
2383 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2384 | ||
2385 | if (maybe_internal_trap) | |
2386 | { | |
2387 | /* Handle anything that requires bookkeeping before deciding to | |
2388 | report the event or continue waiting. */ | |
2389 | ||
2390 | /* First check if we can explain the SIGTRAP with an internal | |
2391 | breakpoint, or if we should possibly report the event to GDB. | |
2392 | Do this before anything that may remove or insert a | |
2393 | breakpoint. */ | |
2394 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2395 | ||
2396 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2397 | finished. If so, tweak the state machine accordingly, | |
2398 | reinsert breakpoints and delete any reinsert (software | |
2399 | single-step) breakpoints. */ | |
2400 | step_over_finished = finish_step_over (event_child); | |
2401 | ||
2402 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2403 | check_breakpoints (event_child->stop_pc); | |
2404 | ||
219f2f23 PA |
2405 | /* Handle tracepoint data collecting. This may overflow the |
2406 | trace buffer, and cause a tracing stop, removing | |
2407 | breakpoints. */ | |
2408 | trace_event = handle_tracepoints (event_child); | |
2409 | ||
6bf5e0ba PA |
2410 | if (bp_explains_trap) |
2411 | { | |
2412 | /* If we stepped or ran into an internal breakpoint, we've | |
2413 | already handled it. So next time we resume (from this | |
2414 | PC), we should step over it. */ | |
2415 | if (debug_threads) | |
87ce2a04 | 2416 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2417 | |
8b07ae33 PA |
2418 | if (breakpoint_here (event_child->stop_pc)) |
2419 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2420 | } |
2421 | } | |
2422 | else | |
2423 | { | |
2424 | /* We have some other signal, possibly a step-over dance was in | |
2425 | progress, and it should be cancelled too. */ | |
2426 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2427 | } |
2428 | ||
2429 | /* We have all the data we need. Either report the event to GDB, or | |
2430 | resume threads and keep waiting for more. */ | |
2431 | ||
2432 | /* If we're collecting a fast tracepoint, finish the collection and | |
2433 | move out of the jump pad before delivering a signal. See | |
2434 | linux_stabilize_threads. */ | |
2435 | ||
2436 | if (WIFSTOPPED (w) | |
2437 | && WSTOPSIG (w) != SIGTRAP | |
2438 | && supports_fast_tracepoints () | |
58b4daa5 | 2439 | && agent_loaded_p ()) |
fa593d66 PA |
2440 | { |
2441 | if (debug_threads) | |
87ce2a04 DE |
2442 | debug_printf ("Got signal %d for LWP %ld. Check if we need " |
2443 | "to defer or adjust it.\n", | |
2444 | WSTOPSIG (w), lwpid_of (event_child)); | |
fa593d66 PA |
2445 | |
2446 | /* Allow debugging the jump pad itself. */ | |
2447 | if (current_inferior->last_resume_kind != resume_step | |
2448 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2449 | { | |
2450 | enqueue_one_deferred_signal (event_child, &w); | |
2451 | ||
2452 | if (debug_threads) | |
87ce2a04 DE |
2453 | debug_printf ("Signal %d for LWP %ld deferred (in jump pad)\n", |
2454 | WSTOPSIG (w), lwpid_of (event_child)); | |
fa593d66 PA |
2455 | |
2456 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2457 | goto retry; | |
2458 | } | |
2459 | } | |
219f2f23 | 2460 | |
fa593d66 PA |
2461 | if (event_child->collecting_fast_tracepoint) |
2462 | { | |
2463 | if (debug_threads) | |
87ce2a04 DE |
2464 | debug_printf ("LWP %ld was trying to move out of the jump pad (%d). " |
2465 | "Check if we're already there.\n", | |
2466 | lwpid_of (event_child), | |
2467 | event_child->collecting_fast_tracepoint); | |
fa593d66 PA |
2468 | |
2469 | trace_event = 1; | |
2470 | ||
2471 | event_child->collecting_fast_tracepoint | |
2472 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2473 | ||
2474 | if (event_child->collecting_fast_tracepoint != 1) | |
2475 | { | |
2476 | /* No longer need this breakpoint. */ | |
2477 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2478 | { | |
2479 | if (debug_threads) | |
87ce2a04 DE |
2480 | debug_printf ("No longer need exit-jump-pad bkpt; removing it." |
2481 | "stopping all threads momentarily.\n"); | |
fa593d66 PA |
2482 | |
2483 | /* Other running threads could hit this breakpoint. | |
2484 | We don't handle moribund locations like GDB does, | |
2485 | instead we always pause all threads when removing | |
2486 | breakpoints, so that any step-over or | |
2487 | decr_pc_after_break adjustment is always taken | |
2488 | care of while the breakpoint is still | |
2489 | inserted. */ | |
2490 | stop_all_lwps (1, event_child); | |
2491 | cancel_breakpoints (); | |
2492 | ||
2493 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2494 | event_child->exit_jump_pad_bkpt = NULL; | |
2495 | ||
2496 | unstop_all_lwps (1, event_child); | |
2497 | ||
2498 | gdb_assert (event_child->suspended >= 0); | |
2499 | } | |
2500 | } | |
2501 | ||
2502 | if (event_child->collecting_fast_tracepoint == 0) | |
2503 | { | |
2504 | if (debug_threads) | |
87ce2a04 DE |
2505 | debug_printf ("fast tracepoint finished " |
2506 | "collecting successfully.\n"); | |
fa593d66 PA |
2507 | |
2508 | /* We may have a deferred signal to report. */ | |
2509 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2510 | { | |
2511 | if (debug_threads) | |
87ce2a04 | 2512 | debug_printf ("dequeued one signal.\n"); |
fa593d66 | 2513 | } |
3c11dd79 | 2514 | else |
fa593d66 | 2515 | { |
3c11dd79 | 2516 | if (debug_threads) |
87ce2a04 | 2517 | debug_printf ("no deferred signals.\n"); |
fa593d66 PA |
2518 | |
2519 | if (stabilizing_threads) | |
2520 | { | |
2521 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2522 | ourstatus->value.sig = GDB_SIGNAL_0; |
87ce2a04 DE |
2523 | |
2524 | if (debug_threads) | |
2525 | { | |
2526 | debug_printf ("linux_wait_1 ret = %s, stopped " | |
2527 | "while stabilizing threads\n", | |
2528 | target_pid_to_str (ptid_of (event_child))); | |
2529 | debug_exit (); | |
2530 | } | |
2531 | ||
fa593d66 PA |
2532 | return ptid_of (event_child); |
2533 | } | |
2534 | } | |
2535 | } | |
6bf5e0ba PA |
2536 | } |
2537 | ||
e471f25b PA |
2538 | /* Check whether GDB would be interested in this event. */ |
2539 | ||
2540 | /* If GDB is not interested in this signal, don't stop other | |
2541 | threads, and don't report it to GDB. Just resume the inferior | |
2542 | right away. We do this for threading-related signals as well as | |
2543 | any that GDB specifically requested we ignore. But never ignore | |
2544 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2545 | stepping - they may require special handling to skip the signal | |
2546 | handler. */ | |
2547 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2548 | thread library? */ | |
2549 | if (WIFSTOPPED (w) | |
2550 | && current_inferior->last_resume_kind != resume_step | |
2551 | && ( | |
1a981360 | 2552 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2553 | (current_process ()->private->thread_db != NULL |
2554 | && (WSTOPSIG (w) == __SIGRTMIN | |
2555 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2556 | || | |
2557 | #endif | |
2ea28649 | 2558 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2559 | && !(WSTOPSIG (w) == SIGSTOP |
2560 | && current_inferior->last_resume_kind == resume_stop)))) | |
2561 | { | |
2562 | siginfo_t info, *info_p; | |
2563 | ||
2564 | if (debug_threads) | |
87ce2a04 DE |
2565 | debug_printf ("Ignored signal %d for LWP %ld.\n", |
2566 | WSTOPSIG (w), lwpid_of (event_child)); | |
e471f25b | 2567 | |
56f7af9c | 2568 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), |
b8e1b30e | 2569 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2570 | info_p = &info; |
2571 | else | |
2572 | info_p = NULL; | |
2573 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2574 | WSTOPSIG (w), info_p); | |
2575 | goto retry; | |
2576 | } | |
2577 | ||
c2d6af84 PA |
2578 | /* Note that all addresses are always "out of the step range" when |
2579 | there's no range to begin with. */ | |
2580 | in_step_range = lwp_in_step_range (event_child); | |
2581 | ||
2582 | /* If GDB wanted this thread to single step, and the thread is out | |
2583 | of the step range, we always want to report the SIGTRAP, and let | |
2584 | GDB handle it. Watchpoints should always be reported. So should | |
2585 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2586 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2587 | do, we're be able to handle GDB breakpoints on top of internal | |
2588 | breakpoints, by handling the internal breakpoint and still | |
2589 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2590 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2591 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2592 | || (current_inferior->last_resume_kind == resume_step |
2593 | && !in_step_range) | |
6bf5e0ba | 2594 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2595 | || (!step_over_finished && !in_step_range |
493e2a69 | 2596 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2597 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2598 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2599 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2600 | ||
2601 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2602 | |
2603 | /* We found no reason GDB would want us to stop. We either hit one | |
2604 | of our own breakpoints, or finished an internal step GDB | |
2605 | shouldn't know about. */ | |
2606 | if (!report_to_gdb) | |
2607 | { | |
2608 | if (debug_threads) | |
2609 | { | |
2610 | if (bp_explains_trap) | |
87ce2a04 | 2611 | debug_printf ("Hit a gdbserver breakpoint.\n"); |
6bf5e0ba | 2612 | if (step_over_finished) |
87ce2a04 | 2613 | debug_printf ("Step-over finished.\n"); |
219f2f23 | 2614 | if (trace_event) |
87ce2a04 | 2615 | debug_printf ("Tracepoint event.\n"); |
c2d6af84 | 2616 | if (lwp_in_step_range (event_child)) |
87ce2a04 DE |
2617 | debug_printf ("Range stepping pc 0x%s [0x%s, 0x%s).\n", |
2618 | paddress (event_child->stop_pc), | |
2619 | paddress (event_child->step_range_start), | |
2620 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2621 | } |
2622 | ||
2623 | /* We're not reporting this breakpoint to GDB, so apply the | |
2624 | decr_pc_after_break adjustment to the inferior's regcache | |
2625 | ourselves. */ | |
2626 | ||
2627 | if (the_low_target.set_pc != NULL) | |
2628 | { | |
2629 | struct regcache *regcache | |
2630 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2631 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2632 | } | |
2633 | ||
7984d532 PA |
2634 | /* We may have finished stepping over a breakpoint. If so, |
2635 | we've stopped and suspended all LWPs momentarily except the | |
2636 | stepping one. This is where we resume them all again. We're | |
2637 | going to keep waiting, so use proceed, which handles stepping | |
2638 | over the next breakpoint. */ | |
6bf5e0ba | 2639 | if (debug_threads) |
87ce2a04 | 2640 | debug_printf ("proceeding all threads.\n"); |
7984d532 PA |
2641 | |
2642 | if (step_over_finished) | |
2643 | unsuspend_all_lwps (event_child); | |
2644 | ||
6bf5e0ba PA |
2645 | proceed_all_lwps (); |
2646 | goto retry; | |
2647 | } | |
2648 | ||
2649 | if (debug_threads) | |
2650 | { | |
8336d594 | 2651 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2652 | { |
2653 | if (event_child->step_range_start == event_child->step_range_end) | |
87ce2a04 | 2654 | debug_printf ("GDB wanted to single-step, reporting event.\n"); |
c2d6af84 | 2655 | else if (!lwp_in_step_range (event_child)) |
87ce2a04 | 2656 | debug_printf ("Out of step range, reporting event.\n"); |
c2d6af84 | 2657 | } |
6bf5e0ba | 2658 | if (event_child->stopped_by_watchpoint) |
87ce2a04 | 2659 | debug_printf ("Stopped by watchpoint.\n"); |
8b07ae33 | 2660 | if (gdb_breakpoint_here (event_child->stop_pc)) |
87ce2a04 | 2661 | debug_printf ("Stopped by GDB breakpoint.\n"); |
6bf5e0ba | 2662 | if (debug_threads) |
87ce2a04 | 2663 | debug_printf ("Hit a non-gdbserver trap event.\n"); |
6bf5e0ba PA |
2664 | } |
2665 | ||
2666 | /* Alright, we're going to report a stop. */ | |
2667 | ||
fa593d66 | 2668 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2669 | { |
2670 | /* In all-stop, stop all threads. */ | |
7984d532 | 2671 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2672 | |
2673 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2674 | from among those that have had events. Giving equal priority | |
2675 | to all LWPs that have had events helps prevent | |
2676 | starvation. */ | |
2677 | if (ptid_equal (ptid, minus_one_ptid)) | |
2678 | { | |
2679 | event_child->status_pending_p = 1; | |
2680 | event_child->status_pending = w; | |
2681 | ||
2682 | select_event_lwp (&event_child); | |
2683 | ||
ee1e2d4f DE |
2684 | /* current_inferior and event_child must stay in sync. */ |
2685 | current_inferior = get_lwp_thread (event_child); | |
2686 | ||
6bf5e0ba PA |
2687 | event_child->status_pending_p = 0; |
2688 | w = event_child->status_pending; | |
2689 | } | |
2690 | ||
2691 | /* Now that we've selected our final event LWP, cancel any | |
2692 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2693 | See the comment in cancel_breakpoints_callback to find out | |
2694 | why. */ | |
2695 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2696 | |
c03e6ccc YQ |
2697 | /* If we were going a step-over, all other threads but the stepping one |
2698 | had been paused in start_step_over, with their suspend counts | |
2699 | incremented. We don't want to do a full unstop/unpause, because we're | |
2700 | in all-stop mode (so we want threads stopped), but we still need to | |
2701 | unsuspend the other threads, to decrement their `suspended' count | |
2702 | back. */ | |
2703 | if (step_over_finished) | |
2704 | unsuspend_all_lwps (event_child); | |
2705 | ||
fa593d66 PA |
2706 | /* Stabilize threads (move out of jump pads). */ |
2707 | stabilize_threads (); | |
6bf5e0ba PA |
2708 | } |
2709 | else | |
2710 | { | |
2711 | /* If we just finished a step-over, then all threads had been | |
2712 | momentarily paused. In all-stop, that's fine, we want | |
2713 | threads stopped by now anyway. In non-stop, we need to | |
2714 | re-resume threads that GDB wanted to be running. */ | |
2715 | if (step_over_finished) | |
7984d532 | 2716 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2717 | } |
2718 | ||
5b1c542e | 2719 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2720 | |
8336d594 PA |
2721 | if (current_inferior->last_resume_kind == resume_stop |
2722 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2723 | { |
2724 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2725 | and it stopped cleanly, so report as SIG0. The use of | |
2726 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2727 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2728 | } |
8336d594 PA |
2729 | else if (current_inferior->last_resume_kind == resume_stop |
2730 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2731 | { |
2732 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2733 | but, it stopped for other reasons. */ |
2ea28649 | 2734 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2735 | } |
2736 | else | |
2737 | { | |
2ea28649 | 2738 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2739 | } |
2740 | ||
d50171e4 PA |
2741 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2742 | ||
bd99dc85 | 2743 | if (debug_threads) |
87ce2a04 DE |
2744 | { |
2745 | debug_printf ("linux_wait_1 ret = %s, %d, %d\n", | |
2746 | target_pid_to_str (ptid_of (event_child)), | |
2747 | ourstatus->kind, ourstatus->value.sig); | |
2748 | debug_exit (); | |
2749 | } | |
bd99dc85 | 2750 | |
6bf5e0ba | 2751 | return ptid_of (event_child); |
bd99dc85 PA |
2752 | } |
2753 | ||
2754 | /* Get rid of any pending event in the pipe. */ | |
2755 | static void | |
2756 | async_file_flush (void) | |
2757 | { | |
2758 | int ret; | |
2759 | char buf; | |
2760 | ||
2761 | do | |
2762 | ret = read (linux_event_pipe[0], &buf, 1); | |
2763 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2764 | } | |
2765 | ||
2766 | /* Put something in the pipe, so the event loop wakes up. */ | |
2767 | static void | |
2768 | async_file_mark (void) | |
2769 | { | |
2770 | int ret; | |
2771 | ||
2772 | async_file_flush (); | |
2773 | ||
2774 | do | |
2775 | ret = write (linux_event_pipe[1], "+", 1); | |
2776 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2777 | ||
2778 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2779 | be awakened anyway. */ | |
2780 | } | |
2781 | ||
95954743 PA |
2782 | static ptid_t |
2783 | linux_wait (ptid_t ptid, | |
2784 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2785 | { |
95954743 | 2786 | ptid_t event_ptid; |
bd99dc85 | 2787 | |
bd99dc85 PA |
2788 | /* Flush the async file first. */ |
2789 | if (target_is_async_p ()) | |
2790 | async_file_flush (); | |
2791 | ||
95954743 | 2792 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2793 | |
2794 | /* If at least one stop was reported, there may be more. A single | |
2795 | SIGCHLD can signal more than one child stop. */ | |
2796 | if (target_is_async_p () | |
2797 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2798 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2799 | async_file_mark (); |
2800 | ||
2801 | return event_ptid; | |
da6d8c04 DJ |
2802 | } |
2803 | ||
c5f62d5f | 2804 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2805 | |
2806 | static int | |
a1928bad | 2807 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2808 | { |
c5f62d5f DE |
2809 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2810 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2811 | |
c5f62d5f DE |
2812 | #ifdef __NR_tkill |
2813 | { | |
2814 | static int tkill_failed; | |
fd500816 | 2815 | |
c5f62d5f DE |
2816 | if (!tkill_failed) |
2817 | { | |
2818 | int ret; | |
2819 | ||
2820 | errno = 0; | |
2821 | ret = syscall (__NR_tkill, lwpid, signo); | |
2822 | if (errno != ENOSYS) | |
2823 | return ret; | |
2824 | tkill_failed = 1; | |
2825 | } | |
2826 | } | |
fd500816 DJ |
2827 | #endif |
2828 | ||
2829 | return kill (lwpid, signo); | |
2830 | } | |
2831 | ||
964e4306 PA |
2832 | void |
2833 | linux_stop_lwp (struct lwp_info *lwp) | |
2834 | { | |
2835 | send_sigstop (lwp); | |
2836 | } | |
2837 | ||
0d62e5e8 | 2838 | static void |
02fc4de7 | 2839 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2840 | { |
bd99dc85 | 2841 | int pid; |
0d62e5e8 | 2842 | |
bd99dc85 PA |
2843 | pid = lwpid_of (lwp); |
2844 | ||
0d62e5e8 DJ |
2845 | /* If we already have a pending stop signal for this process, don't |
2846 | send another. */ | |
54a0b537 | 2847 | if (lwp->stop_expected) |
0d62e5e8 | 2848 | { |
ae13219e | 2849 | if (debug_threads) |
87ce2a04 | 2850 | debug_printf ("Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2851 | |
0d62e5e8 DJ |
2852 | return; |
2853 | } | |
2854 | ||
2855 | if (debug_threads) | |
87ce2a04 | 2856 | debug_printf ("Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2857 | |
d50171e4 | 2858 | lwp->stop_expected = 1; |
bd99dc85 | 2859 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2860 | } |
2861 | ||
7984d532 PA |
2862 | static int |
2863 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2864 | { |
2865 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2866 | ||
7984d532 PA |
2867 | /* Ignore EXCEPT. */ |
2868 | if (lwp == except) | |
2869 | return 0; | |
2870 | ||
02fc4de7 | 2871 | if (lwp->stopped) |
7984d532 | 2872 | return 0; |
02fc4de7 PA |
2873 | |
2874 | send_sigstop (lwp); | |
7984d532 PA |
2875 | return 0; |
2876 | } | |
2877 | ||
2878 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2879 | yet. */ | |
2880 | static int | |
2881 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2882 | void *except) | |
2883 | { | |
2884 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2885 | ||
2886 | /* Ignore EXCEPT. */ | |
2887 | if (lwp == except) | |
2888 | return 0; | |
2889 | ||
2890 | lwp->suspended++; | |
2891 | ||
2892 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2893 | } |
2894 | ||
95954743 PA |
2895 | static void |
2896 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2897 | { | |
2898 | /* It's dead, really. */ | |
2899 | lwp->dead = 1; | |
2900 | ||
2901 | /* Store the exit status for later. */ | |
2902 | lwp->status_pending_p = 1; | |
2903 | lwp->status_pending = wstat; | |
2904 | ||
95954743 PA |
2905 | /* Prevent trying to stop it. */ |
2906 | lwp->stopped = 1; | |
2907 | ||
2908 | /* No further stops are expected from a dead lwp. */ | |
2909 | lwp->stop_expected = 0; | |
2910 | } | |
2911 | ||
0d62e5e8 DJ |
2912 | static void |
2913 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2914 | { | |
54a0b537 | 2915 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2916 | struct thread_info *saved_inferior; |
a1928bad | 2917 | int wstat; |
95954743 PA |
2918 | ptid_t saved_tid; |
2919 | ptid_t ptid; | |
d50171e4 | 2920 | int pid; |
0d62e5e8 | 2921 | |
54a0b537 | 2922 | if (lwp->stopped) |
d50171e4 PA |
2923 | { |
2924 | if (debug_threads) | |
87ce2a04 DE |
2925 | debug_printf ("wait_for_sigstop: LWP %ld already stopped\n", |
2926 | lwpid_of (lwp)); | |
d50171e4 PA |
2927 | return; |
2928 | } | |
0d62e5e8 DJ |
2929 | |
2930 | saved_inferior = current_inferior; | |
bd99dc85 | 2931 | if (saved_inferior != NULL) |
80894984 | 2932 | saved_tid = saved_inferior->entry.id; |
bd99dc85 | 2933 | else |
95954743 | 2934 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2935 | |
80894984 | 2936 | ptid = lwp->entry.id; |
bd99dc85 | 2937 | |
d50171e4 | 2938 | if (debug_threads) |
87ce2a04 | 2939 | debug_printf ("wait_for_sigstop: pulling one event\n"); |
d50171e4 PA |
2940 | |
2941 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2942 | |
2943 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2944 | and record the pending SIGSTOP. If the process exited, just | |
2945 | return. */ | |
d50171e4 | 2946 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2947 | { |
2948 | if (debug_threads) | |
87ce2a04 DE |
2949 | debug_printf ("LWP %ld stopped with signal %d\n", |
2950 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2951 | |
d50171e4 | 2952 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2953 | { |
2954 | if (debug_threads) | |
87ce2a04 DE |
2955 | debug_printf ("LWP %ld stopped with non-sigstop status %06x\n", |
2956 | lwpid_of (lwp), wstat); | |
d50171e4 | 2957 | |
c35fafde PA |
2958 | lwp->status_pending_p = 1; |
2959 | lwp->status_pending = wstat; | |
2960 | } | |
0d62e5e8 | 2961 | } |
d50171e4 | 2962 | else |
95954743 PA |
2963 | { |
2964 | if (debug_threads) | |
87ce2a04 | 2965 | debug_printf ("Process %d exited while stopping LWPs\n", pid); |
95954743 | 2966 | |
d50171e4 PA |
2967 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2968 | if (lwp) | |
2969 | { | |
2970 | /* Leave this status pending for the next time we're able to | |
2971 | report it. In the mean time, we'll report this lwp as | |
2972 | dead to GDB, so GDB doesn't try to read registers and | |
2973 | memory from it. This can only happen if this was the | |
2974 | last thread of the process; otherwise, PID is removed | |
2975 | from the thread tables before linux_wait_for_event | |
2976 | returns. */ | |
2977 | mark_lwp_dead (lwp, wstat); | |
2978 | } | |
95954743 | 2979 | } |
0d62e5e8 | 2980 | |
bd99dc85 | 2981 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2982 | current_inferior = saved_inferior; |
2983 | else | |
2984 | { | |
2985 | if (debug_threads) | |
87ce2a04 | 2986 | debug_printf ("Previously current thread died.\n"); |
0d62e5e8 | 2987 | |
bd99dc85 PA |
2988 | if (non_stop) |
2989 | { | |
2990 | /* We can't change the current inferior behind GDB's back, | |
2991 | otherwise, a subsequent command may apply to the wrong | |
2992 | process. */ | |
2993 | current_inferior = NULL; | |
2994 | } | |
2995 | else | |
2996 | { | |
2997 | /* Set a valid thread as current. */ | |
2998 | set_desired_inferior (0); | |
2999 | } | |
0d62e5e8 DJ |
3000 | } |
3001 | } | |
3002 | ||
fa593d66 PA |
3003 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
3004 | move it out, because we need to report the stop event to GDB. For | |
3005 | example, if the user puts a breakpoint in the jump pad, it's | |
3006 | because she wants to debug it. */ | |
3007 | ||
3008 | static int | |
3009 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
3010 | { | |
3011 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3012 | struct thread_info *thread = get_lwp_thread (lwp); | |
3013 | ||
3014 | gdb_assert (lwp->suspended == 0); | |
3015 | gdb_assert (lwp->stopped); | |
3016 | ||
3017 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3018 | return (supports_fast_tracepoints () | |
58b4daa5 | 3019 | && agent_loaded_p () |
fa593d66 PA |
3020 | && (gdb_breakpoint_here (lwp->stop_pc) |
3021 | || lwp->stopped_by_watchpoint | |
3022 | || thread->last_resume_kind == resume_step) | |
3023 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3024 | } | |
3025 | ||
3026 | static void | |
3027 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3028 | { | |
3029 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3030 | struct thread_info *thread = get_lwp_thread (lwp); | |
3031 | int *wstat; | |
3032 | ||
3033 | gdb_assert (lwp->suspended == 0); | |
3034 | gdb_assert (lwp->stopped); | |
3035 | ||
3036 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3037 | ||
3038 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3039 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3040 | && !lwp->stopped_by_watchpoint | |
3041 | && thread->last_resume_kind != resume_step | |
3042 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3043 | { | |
3044 | if (debug_threads) | |
87ce2a04 DE |
3045 | debug_printf ("LWP %ld needs stabilizing (in jump pad)\n", |
3046 | lwpid_of (lwp)); | |
fa593d66 PA |
3047 | |
3048 | if (wstat) | |
3049 | { | |
3050 | lwp->status_pending_p = 0; | |
3051 | enqueue_one_deferred_signal (lwp, wstat); | |
3052 | ||
3053 | if (debug_threads) | |
87ce2a04 DE |
3054 | debug_printf ("Signal %d for LWP %ld deferred " |
3055 | "(in jump pad)\n", | |
3056 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
fa593d66 PA |
3057 | } |
3058 | ||
3059 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3060 | } | |
3061 | else | |
3062 | lwp->suspended++; | |
3063 | } | |
3064 | ||
3065 | static int | |
3066 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3067 | { | |
3068 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3069 | ||
3070 | if (lwp->dead) | |
3071 | return 0; | |
3072 | if (lwp->stopped) | |
3073 | return 0; | |
3074 | return 1; | |
3075 | } | |
3076 | ||
7984d532 PA |
3077 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3078 | If SUSPEND, then also increase the suspend count of every LWP, | |
3079 | except EXCEPT. */ | |
3080 | ||
0d62e5e8 | 3081 | static void |
7984d532 | 3082 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3083 | { |
bde24c0a PA |
3084 | /* Should not be called recursively. */ |
3085 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3086 | ||
87ce2a04 DE |
3087 | if (debug_threads) |
3088 | { | |
3089 | debug_enter (); | |
3090 | debug_printf ("stop_all_lwps (%s, except=%s)\n", | |
3091 | suspend ? "stop-and-suspend" : "stop", | |
3092 | except != NULL | |
3093 | ? target_pid_to_str (ptid_of (except)) | |
3094 | : "none"); | |
3095 | } | |
3096 | ||
bde24c0a PA |
3097 | stopping_threads = (suspend |
3098 | ? STOPPING_AND_SUSPENDING_THREADS | |
3099 | : STOPPING_THREADS); | |
7984d532 PA |
3100 | |
3101 | if (suspend) | |
3102 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3103 | else | |
3104 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3105 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3106 | stopping_threads = NOT_STOPPING_THREADS; |
87ce2a04 DE |
3107 | |
3108 | if (debug_threads) | |
3109 | { | |
3110 | debug_printf ("stop_all_lwps done, setting stopping_threads " | |
3111 | "back to !stopping\n"); | |
3112 | debug_exit (); | |
3113 | } | |
0d62e5e8 DJ |
3114 | } |
3115 | ||
da6d8c04 DJ |
3116 | /* Resume execution of the inferior process. |
3117 | If STEP is nonzero, single-step it. | |
3118 | If SIGNAL is nonzero, give it that signal. */ | |
3119 | ||
ce3a066d | 3120 | static void |
2acc282a | 3121 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3122 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3123 | { |
0d62e5e8 | 3124 | struct thread_info *saved_inferior; |
fa593d66 | 3125 | int fast_tp_collecting; |
0d62e5e8 | 3126 | |
54a0b537 | 3127 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3128 | return; |
3129 | ||
fa593d66 PA |
3130 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3131 | ||
3132 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3133 | ||
219f2f23 PA |
3134 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3135 | user used the "jump" command, or "set $pc = foo"). */ | |
3136 | if (lwp->stop_pc != get_pc (lwp)) | |
3137 | { | |
3138 | /* Collecting 'while-stepping' actions doesn't make sense | |
3139 | anymore. */ | |
3140 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3141 | } | |
3142 | ||
0d62e5e8 DJ |
3143 | /* If we have pending signals or status, and a new signal, enqueue the |
3144 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3145 | breakpoint; it will be picked up again below. */ | |
3146 | if (signal != 0 | |
fa593d66 PA |
3147 | && (lwp->status_pending_p |
3148 | || lwp->pending_signals != NULL | |
3149 | || lwp->bp_reinsert != 0 | |
3150 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3151 | { |
3152 | struct pending_signals *p_sig; | |
bca929d3 | 3153 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3154 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3155 | p_sig->signal = signal; |
32ca6d61 DJ |
3156 | if (info == NULL) |
3157 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3158 | else | |
3159 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3160 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3161 | } |
3162 | ||
d50171e4 PA |
3163 | if (lwp->status_pending_p) |
3164 | { | |
3165 | if (debug_threads) | |
87ce2a04 DE |
3166 | debug_printf ("Not resuming lwp %ld (%s, signal %d, stop %s);" |
3167 | " has pending status\n", | |
3168 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3169 | lwp->stop_expected ? "expected" : "not expected"); | |
d50171e4 PA |
3170 | return; |
3171 | } | |
0d62e5e8 DJ |
3172 | |
3173 | saved_inferior = current_inferior; | |
54a0b537 | 3174 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3175 | |
3176 | if (debug_threads) | |
87ce2a04 DE |
3177 | debug_printf ("Resuming lwp %ld (%s, signal %d, stop %s)\n", |
3178 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3179 | lwp->stop_expected ? "expected" : "not expected"); | |
0d62e5e8 DJ |
3180 | |
3181 | /* This bit needs some thinking about. If we get a signal that | |
3182 | we must report while a single-step reinsert is still pending, | |
3183 | we often end up resuming the thread. It might be better to | |
3184 | (ew) allow a stack of pending events; then we could be sure that | |
3185 | the reinsert happened right away and not lose any signals. | |
3186 | ||
3187 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3188 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3189 | complete correctness, so it won't solve that problem. It may be |
3190 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3191 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3192 | { |
3193 | if (debug_threads) | |
87ce2a04 DE |
3194 | debug_printf (" pending reinsert at 0x%s\n", |
3195 | paddress (lwp->bp_reinsert)); | |
d50171e4 | 3196 | |
85e00e85 | 3197 | if (can_hardware_single_step ()) |
d50171e4 | 3198 | { |
fa593d66 PA |
3199 | if (fast_tp_collecting == 0) |
3200 | { | |
3201 | if (step == 0) | |
3202 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3203 | if (lwp->suspended) | |
3204 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3205 | lwp->suspended); | |
3206 | } | |
d50171e4 PA |
3207 | |
3208 | step = 1; | |
3209 | } | |
0d62e5e8 DJ |
3210 | |
3211 | /* Postpone any pending signal. It was enqueued above. */ | |
3212 | signal = 0; | |
3213 | } | |
3214 | ||
fa593d66 PA |
3215 | if (fast_tp_collecting == 1) |
3216 | { | |
3217 | if (debug_threads) | |
87ce2a04 DE |
3218 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3219 | " (exit-jump-pad-bkpt)\n", | |
3220 | lwpid_of (lwp)); | |
fa593d66 PA |
3221 | |
3222 | /* Postpone any pending signal. It was enqueued above. */ | |
3223 | signal = 0; | |
3224 | } | |
3225 | else if (fast_tp_collecting == 2) | |
3226 | { | |
3227 | if (debug_threads) | |
87ce2a04 DE |
3228 | debug_printf ("lwp %ld wants to get out of fast tracepoint jump pad" |
3229 | " single-stepping\n", | |
3230 | lwpid_of (lwp)); | |
fa593d66 PA |
3231 | |
3232 | if (can_hardware_single_step ()) | |
3233 | step = 1; | |
3234 | else | |
3235 | fatal ("moving out of jump pad single-stepping" | |
3236 | " not implemented on this target"); | |
3237 | ||
3238 | /* Postpone any pending signal. It was enqueued above. */ | |
3239 | signal = 0; | |
3240 | } | |
3241 | ||
219f2f23 PA |
3242 | /* If we have while-stepping actions in this thread set it stepping. |
3243 | If we have a signal to deliver, it may or may not be set to | |
3244 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3245 | while-stepping into a signal handler. A possible smart thing to | |
3246 | do would be to set an internal breakpoint at the signal return | |
3247 | address, continue, and carry on catching this while-stepping | |
3248 | action only when that breakpoint is hit. A future | |
3249 | enhancement. */ | |
3250 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3251 | && can_hardware_single_step ()) | |
3252 | { | |
3253 | if (debug_threads) | |
87ce2a04 DE |
3254 | debug_printf ("lwp %ld has a while-stepping action -> forcing step.\n", |
3255 | lwpid_of (lwp)); | |
219f2f23 PA |
3256 | step = 1; |
3257 | } | |
3258 | ||
aa691b87 | 3259 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3260 | { |
442ea881 PA |
3261 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3262 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
87ce2a04 | 3263 | debug_printf (" resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3264 | } |
3265 | ||
fa593d66 PA |
3266 | /* If we have pending signals, consume one unless we are trying to |
3267 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3268 | collect. */ | |
3269 | if (lwp->pending_signals != NULL | |
3270 | && lwp->bp_reinsert == 0 | |
3271 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3272 | { |
3273 | struct pending_signals **p_sig; | |
3274 | ||
54a0b537 | 3275 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3276 | while ((*p_sig)->prev != NULL) |
3277 | p_sig = &(*p_sig)->prev; | |
3278 | ||
3279 | signal = (*p_sig)->signal; | |
32ca6d61 | 3280 | if ((*p_sig)->info.si_signo != 0) |
b8e1b30e | 3281 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3282 | &(*p_sig)->info); |
32ca6d61 | 3283 | |
0d62e5e8 DJ |
3284 | free (*p_sig); |
3285 | *p_sig = NULL; | |
3286 | } | |
3287 | ||
aa5ca48f DE |
3288 | if (the_low_target.prepare_to_resume != NULL) |
3289 | the_low_target.prepare_to_resume (lwp); | |
3290 | ||
3aee8918 | 3291 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
da6d8c04 | 3292 | errno = 0; |
54a0b537 | 3293 | lwp->stopped = 0; |
c3adc08c | 3294 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3295 | lwp->stepping = step; |
56f7af9c | 3296 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), |
b8e1b30e | 3297 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3298 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3299 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3300 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 DJ |
3301 | |
3302 | current_inferior = saved_inferior; | |
da6d8c04 | 3303 | if (errno) |
3221518c UW |
3304 | { |
3305 | /* ESRCH from ptrace either means that the thread was already | |
3306 | running (an error) or that it is gone (a race condition). If | |
3307 | it's gone, we will get a notification the next time we wait, | |
3308 | so we can ignore the error. We could differentiate these | |
3309 | two, but it's tricky without waiting; the thread still exists | |
3310 | as a zombie, so sending it signal 0 would succeed. So just | |
3311 | ignore ESRCH. */ | |
3312 | if (errno == ESRCH) | |
3313 | return; | |
3314 | ||
3315 | perror_with_name ("ptrace"); | |
3316 | } | |
da6d8c04 DJ |
3317 | } |
3318 | ||
2bd7c093 PA |
3319 | struct thread_resume_array |
3320 | { | |
3321 | struct thread_resume *resume; | |
3322 | size_t n; | |
3323 | }; | |
64386c31 | 3324 | |
ebcf782c DE |
3325 | /* This function is called once per thread via find_inferior. |
3326 | ARG is a pointer to a thread_resume_array struct. | |
3327 | We look up the thread specified by ENTRY in ARG, and mark the thread | |
3328 | with a pointer to the appropriate resume request. | |
5544ad89 DJ |
3329 | |
3330 | This algorithm is O(threads * resume elements), but resume elements | |
3331 | is small (and will remain small at least until GDB supports thread | |
3332 | suspension). */ | |
ebcf782c | 3333 | |
2bd7c093 PA |
3334 | static int |
3335 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3336 | { |
54a0b537 | 3337 | struct lwp_info *lwp; |
64386c31 | 3338 | struct thread_info *thread; |
5544ad89 | 3339 | int ndx; |
2bd7c093 | 3340 | struct thread_resume_array *r; |
64386c31 DJ |
3341 | |
3342 | thread = (struct thread_info *) entry; | |
54a0b537 | 3343 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3344 | r = arg; |
64386c31 | 3345 | |
2bd7c093 | 3346 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3347 | { |
3348 | ptid_t ptid = r->resume[ndx].thread; | |
3349 | if (ptid_equal (ptid, minus_one_ptid) | |
3350 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3351 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3352 | of PID'. */ | |
3353 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3354 | && (ptid_is_pid (ptid) | |
3355 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3356 | { |
d50171e4 | 3357 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3358 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3359 | { |
3360 | if (debug_threads) | |
87ce2a04 DE |
3361 | debug_printf ("already %s LWP %ld at GDB's request\n", |
3362 | (thread->last_status.kind | |
3363 | == TARGET_WAITKIND_STOPPED) | |
3364 | ? "stopped" | |
3365 | : "stopping", | |
3366 | lwpid_of (lwp)); | |
d50171e4 PA |
3367 | |
3368 | continue; | |
3369 | } | |
3370 | ||
95954743 | 3371 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3372 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3373 | |
c2d6af84 PA |
3374 | lwp->step_range_start = lwp->resume->step_range_start; |
3375 | lwp->step_range_end = lwp->resume->step_range_end; | |
3376 | ||
fa593d66 PA |
3377 | /* If we had a deferred signal to report, dequeue one now. |
3378 | This can happen if LWP gets more than one signal while | |
3379 | trying to get out of a jump pad. */ | |
3380 | if (lwp->stopped | |
3381 | && !lwp->status_pending_p | |
3382 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3383 | { | |
3384 | lwp->status_pending_p = 1; | |
3385 | ||
3386 | if (debug_threads) | |
87ce2a04 DE |
3387 | debug_printf ("Dequeueing deferred signal %d for LWP %ld, " |
3388 | "leaving status pending.\n", | |
3389 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
fa593d66 PA |
3390 | } |
3391 | ||
95954743 PA |
3392 | return 0; |
3393 | } | |
3394 | } | |
2bd7c093 PA |
3395 | |
3396 | /* No resume action for this thread. */ | |
3397 | lwp->resume = NULL; | |
64386c31 | 3398 | |
2bd7c093 | 3399 | return 0; |
5544ad89 DJ |
3400 | } |
3401 | ||
20ad9378 DE |
3402 | /* find_inferior callback for linux_resume. |
3403 | Set *FLAG_P if this lwp has an interesting status pending. */ | |
5544ad89 | 3404 | |
bd99dc85 PA |
3405 | static int |
3406 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3407 | { |
bd99dc85 | 3408 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3409 | |
bd99dc85 PA |
3410 | /* LWPs which will not be resumed are not interesting, because |
3411 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3412 | if (lwp->resume == NULL) |
bd99dc85 | 3413 | return 0; |
64386c31 | 3414 | |
bd99dc85 | 3415 | if (lwp->status_pending_p) |
d50171e4 PA |
3416 | * (int *) flag_p = 1; |
3417 | ||
3418 | return 0; | |
3419 | } | |
3420 | ||
3421 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3422 | internal breakpoint that we need to step over. It assumes that any | |
3423 | required STOP_PC adjustment has already been propagated to the | |
3424 | inferior's regcache. */ | |
3425 | ||
3426 | static int | |
3427 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3428 | { | |
3429 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3430 | struct thread_info *thread; |
d50171e4 PA |
3431 | struct thread_info *saved_inferior; |
3432 | CORE_ADDR pc; | |
3433 | ||
3434 | /* LWPs which will not be resumed are not interesting, because we | |
3435 | might not wait for them next time through linux_wait. */ | |
3436 | ||
3437 | if (!lwp->stopped) | |
3438 | { | |
3439 | if (debug_threads) | |
87ce2a04 DE |
3440 | debug_printf ("Need step over [LWP %ld]? Ignoring, not stopped\n", |
3441 | lwpid_of (lwp)); | |
d50171e4 PA |
3442 | return 0; |
3443 | } | |
3444 | ||
8336d594 PA |
3445 | thread = get_lwp_thread (lwp); |
3446 | ||
3447 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3448 | { |
3449 | if (debug_threads) | |
87ce2a04 DE |
3450 | debug_printf ("Need step over [LWP %ld]? Ignoring, should remain" |
3451 | " stopped\n", | |
3452 | lwpid_of (lwp)); | |
d50171e4 PA |
3453 | return 0; |
3454 | } | |
3455 | ||
7984d532 PA |
3456 | gdb_assert (lwp->suspended >= 0); |
3457 | ||
3458 | if (lwp->suspended) | |
3459 | { | |
3460 | if (debug_threads) | |
87ce2a04 DE |
3461 | debug_printf ("Need step over [LWP %ld]? Ignoring, suspended\n", |
3462 | lwpid_of (lwp)); | |
7984d532 PA |
3463 | return 0; |
3464 | } | |
3465 | ||
d50171e4 PA |
3466 | if (!lwp->need_step_over) |
3467 | { | |
3468 | if (debug_threads) | |
87ce2a04 | 3469 | debug_printf ("Need step over [LWP %ld]? No\n", lwpid_of (lwp)); |
d50171e4 | 3470 | } |
5544ad89 | 3471 | |
bd99dc85 | 3472 | if (lwp->status_pending_p) |
d50171e4 PA |
3473 | { |
3474 | if (debug_threads) | |
87ce2a04 DE |
3475 | debug_printf ("Need step over [LWP %ld]? Ignoring, has pending" |
3476 | " status.\n", | |
3477 | lwpid_of (lwp)); | |
d50171e4 PA |
3478 | return 0; |
3479 | } | |
3480 | ||
3481 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3482 | or we have. */ | |
3483 | pc = get_pc (lwp); | |
3484 | ||
3485 | /* If the PC has changed since we stopped, then don't do anything, | |
3486 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3487 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3488 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3489 | command, or poked thread's registers herself. */ | |
3490 | if (pc != lwp->stop_pc) | |
3491 | { | |
3492 | if (debug_threads) | |
87ce2a04 DE |
3493 | debug_printf ("Need step over [LWP %ld]? Cancelling, PC was changed. " |
3494 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3495 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
d50171e4 PA |
3496 | |
3497 | lwp->need_step_over = 0; | |
3498 | return 0; | |
3499 | } | |
3500 | ||
3501 | saved_inferior = current_inferior; | |
8336d594 | 3502 | current_inferior = thread; |
d50171e4 | 3503 | |
8b07ae33 | 3504 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3505 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3506 | { |
8b07ae33 | 3507 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3508 | though. If the condition is being evaluated on the target's side |
3509 | and it evaluate to false, step over this breakpoint as well. */ | |
3510 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3511 | && gdb_condition_true_at_breakpoint (pc) |
3512 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3513 | { |
3514 | if (debug_threads) | |
87ce2a04 DE |
3515 | debug_printf ("Need step over [LWP %ld]? yes, but found" |
3516 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3517 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3518 | |
8b07ae33 PA |
3519 | current_inferior = saved_inferior; |
3520 | return 0; | |
3521 | } | |
3522 | else | |
3523 | { | |
3524 | if (debug_threads) | |
87ce2a04 DE |
3525 | debug_printf ("Need step over [LWP %ld]? yes, " |
3526 | "found breakpoint at 0x%s\n", | |
3527 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3528 | |
8b07ae33 PA |
3529 | /* We've found an lwp that needs stepping over --- return 1 so |
3530 | that find_inferior stops looking. */ | |
3531 | current_inferior = saved_inferior; | |
3532 | ||
3533 | /* If the step over is cancelled, this is set again. */ | |
3534 | lwp->need_step_over = 0; | |
3535 | return 1; | |
3536 | } | |
d50171e4 PA |
3537 | } |
3538 | ||
3539 | current_inferior = saved_inferior; | |
3540 | ||
3541 | if (debug_threads) | |
87ce2a04 DE |
3542 | debug_printf ("Need step over [LWP %ld]? No, no breakpoint found" |
3543 | " at 0x%s\n", | |
3544 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3545 | |
bd99dc85 | 3546 | return 0; |
5544ad89 DJ |
3547 | } |
3548 | ||
d50171e4 PA |
3549 | /* Start a step-over operation on LWP. When LWP stopped at a |
3550 | breakpoint, to make progress, we need to remove the breakpoint out | |
3551 | of the way. If we let other threads run while we do that, they may | |
3552 | pass by the breakpoint location and miss hitting it. To avoid | |
3553 | that, a step-over momentarily stops all threads while LWP is | |
3554 | single-stepped while the breakpoint is temporarily uninserted from | |
3555 | the inferior. When the single-step finishes, we reinsert the | |
3556 | breakpoint, and let all threads that are supposed to be running, | |
3557 | run again. | |
3558 | ||
3559 | On targets that don't support hardware single-step, we don't | |
3560 | currently support full software single-stepping. Instead, we only | |
3561 | support stepping over the thread event breakpoint, by asking the | |
3562 | low target where to place a reinsert breakpoint. Since this | |
3563 | routine assumes the breakpoint being stepped over is a thread event | |
3564 | breakpoint, it usually assumes the return address of the current | |
3565 | function is a good enough place to set the reinsert breakpoint. */ | |
3566 | ||
3567 | static int | |
3568 | start_step_over (struct lwp_info *lwp) | |
3569 | { | |
3570 | struct thread_info *saved_inferior; | |
3571 | CORE_ADDR pc; | |
3572 | int step; | |
3573 | ||
3574 | if (debug_threads) | |
87ce2a04 DE |
3575 | debug_printf ("Starting step-over on LWP %ld. Stopping all threads\n", |
3576 | lwpid_of (lwp)); | |
d50171e4 | 3577 | |
7984d532 PA |
3578 | stop_all_lwps (1, lwp); |
3579 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3580 | |
3581 | if (debug_threads) | |
87ce2a04 | 3582 | debug_printf ("Done stopping all threads for step-over.\n"); |
d50171e4 PA |
3583 | |
3584 | /* Note, we should always reach here with an already adjusted PC, | |
3585 | either by GDB (if we're resuming due to GDB's request), or by our | |
3586 | caller, if we just finished handling an internal breakpoint GDB | |
3587 | shouldn't care about. */ | |
3588 | pc = get_pc (lwp); | |
3589 | ||
3590 | saved_inferior = current_inferior; | |
3591 | current_inferior = get_lwp_thread (lwp); | |
3592 | ||
3593 | lwp->bp_reinsert = pc; | |
3594 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3595 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3596 | |
3597 | if (can_hardware_single_step ()) | |
3598 | { | |
3599 | step = 1; | |
3600 | } | |
3601 | else | |
3602 | { | |
3603 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3604 | set_reinsert_breakpoint (raddr); | |
3605 | step = 0; | |
3606 | } | |
3607 | ||
3608 | current_inferior = saved_inferior; | |
3609 | ||
3610 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3611 | ||
3612 | /* Require next event from this LWP. */ | |
80894984 | 3613 | step_over_bkpt = lwp->entry.id; |
d50171e4 PA |
3614 | return 1; |
3615 | } | |
3616 | ||
3617 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3618 | start_step_over, if still there, and delete any reinsert | |
3619 | breakpoints we've set, on non hardware single-step targets. */ | |
3620 | ||
3621 | static int | |
3622 | finish_step_over (struct lwp_info *lwp) | |
3623 | { | |
3624 | if (lwp->bp_reinsert != 0) | |
3625 | { | |
3626 | if (debug_threads) | |
87ce2a04 | 3627 | debug_printf ("Finished step over.\n"); |
d50171e4 PA |
3628 | |
3629 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3630 | may be no breakpoint to reinsert there by now. */ | |
3631 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3632 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3633 | |
3634 | lwp->bp_reinsert = 0; | |
3635 | ||
3636 | /* Delete any software-single-step reinsert breakpoints. No | |
3637 | longer needed. We don't have to worry about other threads | |
3638 | hitting this trap, and later not being able to explain it, | |
3639 | because we were stepping over a breakpoint, and we hold all | |
3640 | threads but LWP stopped while doing that. */ | |
3641 | if (!can_hardware_single_step ()) | |
3642 | delete_reinsert_breakpoints (); | |
3643 | ||
3644 | step_over_bkpt = null_ptid; | |
3645 | return 1; | |
3646 | } | |
3647 | else | |
3648 | return 0; | |
3649 | } | |
3650 | ||
5544ad89 DJ |
3651 | /* This function is called once per thread. We check the thread's resume |
3652 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3653 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3654 | |
bd99dc85 PA |
3655 | For threads which we aren't explicitly told otherwise, we preserve |
3656 | the stepping flag; this is used for stepping over gdbserver-placed | |
3657 | breakpoints. | |
3658 | ||
3659 | If pending_flags was set in any thread, we queue any needed | |
3660 | signals, since we won't actually resume. We already have a pending | |
3661 | event to report, so we don't need to preserve any step requests; | |
3662 | they should be re-issued if necessary. */ | |
3663 | ||
3664 | static int | |
3665 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3666 | { |
54a0b537 | 3667 | struct lwp_info *lwp; |
5544ad89 | 3668 | struct thread_info *thread; |
bd99dc85 | 3669 | int step; |
d50171e4 PA |
3670 | int leave_all_stopped = * (int *) arg; |
3671 | int leave_pending; | |
5544ad89 DJ |
3672 | |
3673 | thread = (struct thread_info *) entry; | |
54a0b537 | 3674 | lwp = get_thread_lwp (thread); |
5544ad89 | 3675 | |
2bd7c093 | 3676 | if (lwp->resume == NULL) |
bd99dc85 | 3677 | return 0; |
5544ad89 | 3678 | |
bd99dc85 | 3679 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3680 | { |
bd99dc85 | 3681 | if (debug_threads) |
87ce2a04 | 3682 | debug_printf ("resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3683 | |
3684 | if (!lwp->stopped) | |
3685 | { | |
3686 | if (debug_threads) | |
87ce2a04 | 3687 | debug_printf ("stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3688 | |
d50171e4 PA |
3689 | /* Stop the thread, and wait for the event asynchronously, |
3690 | through the event loop. */ | |
02fc4de7 | 3691 | send_sigstop (lwp); |
bd99dc85 PA |
3692 | } |
3693 | else | |
3694 | { | |
3695 | if (debug_threads) | |
87ce2a04 DE |
3696 | debug_printf ("already stopped LWP %ld\n", |
3697 | lwpid_of (lwp)); | |
d50171e4 PA |
3698 | |
3699 | /* The LWP may have been stopped in an internal event that | |
3700 | was not meant to be notified back to GDB (e.g., gdbserver | |
3701 | breakpoint), so we should be reporting a stop event in | |
3702 | this case too. */ | |
3703 | ||
3704 | /* If the thread already has a pending SIGSTOP, this is a | |
3705 | no-op. Otherwise, something later will presumably resume | |
3706 | the thread and this will cause it to cancel any pending | |
3707 | operation, due to last_resume_kind == resume_stop. If | |
3708 | the thread already has a pending status to report, we | |
3709 | will still report it the next time we wait - see | |
3710 | status_pending_p_callback. */ | |
1a981360 PA |
3711 | |
3712 | /* If we already have a pending signal to report, then | |
3713 | there's no need to queue a SIGSTOP, as this means we're | |
3714 | midway through moving the LWP out of the jumppad, and we | |
3715 | will report the pending signal as soon as that is | |
3716 | finished. */ | |
3717 | if (lwp->pending_signals_to_report == NULL) | |
3718 | send_sigstop (lwp); | |
bd99dc85 | 3719 | } |
32ca6d61 | 3720 | |
bd99dc85 PA |
3721 | /* For stop requests, we're done. */ |
3722 | lwp->resume = NULL; | |
fc7238bb | 3723 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3724 | return 0; |
5544ad89 DJ |
3725 | } |
3726 | ||
bd99dc85 PA |
3727 | /* If this thread which is about to be resumed has a pending status, |
3728 | then don't resume any threads - we can just report the pending | |
3729 | status. Make sure to queue any signals that would otherwise be | |
3730 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3731 | thread has a pending status. If there's a thread that needs the |
3732 | step-over-breakpoint dance, then don't resume any other thread | |
3733 | but that particular one. */ | |
3734 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3735 | |
d50171e4 | 3736 | if (!leave_pending) |
bd99dc85 PA |
3737 | { |
3738 | if (debug_threads) | |
87ce2a04 | 3739 | debug_printf ("resuming LWP %ld\n", lwpid_of (lwp)); |
5544ad89 | 3740 | |
d50171e4 | 3741 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3742 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3743 | } |
3744 | else | |
3745 | { | |
3746 | if (debug_threads) | |
87ce2a04 | 3747 | debug_printf ("leaving LWP %ld stopped\n", lwpid_of (lwp)); |
5544ad89 | 3748 | |
bd99dc85 PA |
3749 | /* If we have a new signal, enqueue the signal. */ |
3750 | if (lwp->resume->sig != 0) | |
3751 | { | |
3752 | struct pending_signals *p_sig; | |
3753 | p_sig = xmalloc (sizeof (*p_sig)); | |
3754 | p_sig->prev = lwp->pending_signals; | |
3755 | p_sig->signal = lwp->resume->sig; | |
3756 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3757 | ||
3758 | /* If this is the same signal we were previously stopped by, | |
3759 | make sure to queue its siginfo. We can ignore the return | |
3760 | value of ptrace; if it fails, we'll skip | |
3761 | PTRACE_SETSIGINFO. */ | |
3762 | if (WIFSTOPPED (lwp->last_status) | |
3763 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
b8e1b30e | 3764 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3765 | &p_sig->info); |
bd99dc85 PA |
3766 | |
3767 | lwp->pending_signals = p_sig; | |
3768 | } | |
3769 | } | |
5544ad89 | 3770 | |
fc7238bb | 3771 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3772 | lwp->resume = NULL; |
5544ad89 | 3773 | return 0; |
0d62e5e8 DJ |
3774 | } |
3775 | ||
3776 | static void | |
2bd7c093 | 3777 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3778 | { |
2bd7c093 | 3779 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3780 | struct lwp_info *need_step_over = NULL; |
3781 | int any_pending; | |
3782 | int leave_all_stopped; | |
c6ecbae5 | 3783 | |
87ce2a04 DE |
3784 | if (debug_threads) |
3785 | { | |
3786 | debug_enter (); | |
3787 | debug_printf ("linux_resume:\n"); | |
3788 | } | |
3789 | ||
2bd7c093 | 3790 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3791 | |
d50171e4 PA |
3792 | /* If there is a thread which would otherwise be resumed, which has |
3793 | a pending status, then don't resume any threads - we can just | |
3794 | report the pending status. Make sure to queue any signals that | |
3795 | would otherwise be sent. In non-stop mode, we'll apply this | |
3796 | logic to each thread individually. We consume all pending events | |
3797 | before considering to start a step-over (in all-stop). */ | |
3798 | any_pending = 0; | |
bd99dc85 | 3799 | if (!non_stop) |
d50171e4 PA |
3800 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3801 | ||
3802 | /* If there is a thread which would otherwise be resumed, which is | |
3803 | stopped at a breakpoint that needs stepping over, then don't | |
3804 | resume any threads - have it step over the breakpoint with all | |
3805 | other threads stopped, then resume all threads again. Make sure | |
3806 | to queue any signals that would otherwise be delivered or | |
3807 | queued. */ | |
3808 | if (!any_pending && supports_breakpoints ()) | |
3809 | need_step_over | |
3810 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3811 | need_step_over_p, NULL); | |
3812 | ||
3813 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3814 | ||
3815 | if (debug_threads) | |
3816 | { | |
3817 | if (need_step_over != NULL) | |
87ce2a04 | 3818 | debug_printf ("Not resuming all, need step over\n"); |
d50171e4 | 3819 | else if (any_pending) |
87ce2a04 DE |
3820 | debug_printf ("Not resuming, all-stop and found " |
3821 | "an LWP with pending status\n"); | |
d50171e4 | 3822 | else |
87ce2a04 | 3823 | debug_printf ("Resuming, no pending status or step over needed\n"); |
d50171e4 PA |
3824 | } |
3825 | ||
3826 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3827 | otherwise deliver. */ | |
3828 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3829 | ||
3830 | if (need_step_over) | |
3831 | start_step_over (need_step_over); | |
87ce2a04 DE |
3832 | |
3833 | if (debug_threads) | |
3834 | { | |
3835 | debug_printf ("linux_resume done\n"); | |
3836 | debug_exit (); | |
3837 | } | |
d50171e4 PA |
3838 | } |
3839 | ||
3840 | /* This function is called once per thread. We check the thread's | |
3841 | last resume request, which will tell us whether to resume, step, or | |
3842 | leave the thread stopped. Any signal the client requested to be | |
3843 | delivered has already been enqueued at this point. | |
3844 | ||
3845 | If any thread that GDB wants running is stopped at an internal | |
3846 | breakpoint that needs stepping over, we start a step-over operation | |
3847 | on that particular thread, and leave all others stopped. */ | |
3848 | ||
7984d532 PA |
3849 | static int |
3850 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3851 | { |
7984d532 | 3852 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3853 | struct thread_info *thread; |
d50171e4 PA |
3854 | int step; |
3855 | ||
7984d532 PA |
3856 | if (lwp == except) |
3857 | return 0; | |
d50171e4 PA |
3858 | |
3859 | if (debug_threads) | |
87ce2a04 | 3860 | debug_printf ("proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); |
d50171e4 PA |
3861 | |
3862 | if (!lwp->stopped) | |
3863 | { | |
3864 | if (debug_threads) | |
87ce2a04 | 3865 | debug_printf (" LWP %ld already running\n", lwpid_of (lwp)); |
7984d532 | 3866 | return 0; |
d50171e4 PA |
3867 | } |
3868 | ||
8336d594 PA |
3869 | thread = get_lwp_thread (lwp); |
3870 | ||
02fc4de7 PA |
3871 | if (thread->last_resume_kind == resume_stop |
3872 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3873 | { |
3874 | if (debug_threads) | |
87ce2a04 DE |
3875 | debug_printf (" client wants LWP to remain %ld stopped\n", |
3876 | lwpid_of (lwp)); | |
7984d532 | 3877 | return 0; |
d50171e4 PA |
3878 | } |
3879 | ||
3880 | if (lwp->status_pending_p) | |
3881 | { | |
3882 | if (debug_threads) | |
87ce2a04 DE |
3883 | debug_printf (" LWP %ld has pending status, leaving stopped\n", |
3884 | lwpid_of (lwp)); | |
7984d532 | 3885 | return 0; |
d50171e4 PA |
3886 | } |
3887 | ||
7984d532 PA |
3888 | gdb_assert (lwp->suspended >= 0); |
3889 | ||
d50171e4 PA |
3890 | if (lwp->suspended) |
3891 | { | |
3892 | if (debug_threads) | |
87ce2a04 | 3893 | debug_printf (" LWP %ld is suspended\n", lwpid_of (lwp)); |
7984d532 | 3894 | return 0; |
d50171e4 PA |
3895 | } |
3896 | ||
1a981360 PA |
3897 | if (thread->last_resume_kind == resume_stop |
3898 | && lwp->pending_signals_to_report == NULL | |
3899 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3900 | { |
3901 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3902 | last_status.kind check above would catch it, and we wouldn't | |
3903 | reach here. This LWP may have been momentarily paused by a | |
3904 | stop_all_lwps call while handling for example, another LWP's | |
3905 | step-over. In that case, the pending expected SIGSTOP signal | |
3906 | that was queued at vCont;t handling time will have already | |
3907 | been consumed by wait_for_sigstop, and so we need to requeue | |
3908 | another one here. Note that if the LWP already has a SIGSTOP | |
3909 | pending, this is a no-op. */ | |
3910 | ||
3911 | if (debug_threads) | |
87ce2a04 DE |
3912 | debug_printf ("Client wants LWP %ld to stop. " |
3913 | "Making sure it has a SIGSTOP pending\n", | |
3914 | lwpid_of (lwp)); | |
02fc4de7 PA |
3915 | |
3916 | send_sigstop (lwp); | |
3917 | } | |
3918 | ||
8336d594 | 3919 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3920 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3921 | return 0; |
3922 | } | |
3923 | ||
3924 | static int | |
3925 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3926 | { | |
3927 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3928 | ||
3929 | if (lwp == except) | |
3930 | return 0; | |
3931 | ||
3932 | lwp->suspended--; | |
3933 | gdb_assert (lwp->suspended >= 0); | |
3934 | ||
3935 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3936 | } |
3937 | ||
3938 | /* When we finish a step-over, set threads running again. If there's | |
3939 | another thread that may need a step-over, now's the time to start | |
3940 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3941 | ||
3942 | static void | |
3943 | proceed_all_lwps (void) | |
3944 | { | |
3945 | struct lwp_info *need_step_over; | |
3946 | ||
3947 | /* If there is a thread which would otherwise be resumed, which is | |
3948 | stopped at a breakpoint that needs stepping over, then don't | |
3949 | resume any threads - have it step over the breakpoint with all | |
3950 | other threads stopped, then resume all threads again. */ | |
3951 | ||
3952 | if (supports_breakpoints ()) | |
3953 | { | |
3954 | need_step_over | |
3955 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3956 | need_step_over_p, NULL); | |
3957 | ||
3958 | if (need_step_over != NULL) | |
3959 | { | |
3960 | if (debug_threads) | |
87ce2a04 DE |
3961 | debug_printf ("proceed_all_lwps: found " |
3962 | "thread %ld needing a step-over\n", | |
3963 | lwpid_of (need_step_over)); | |
d50171e4 PA |
3964 | |
3965 | start_step_over (need_step_over); | |
3966 | return; | |
3967 | } | |
3968 | } | |
5544ad89 | 3969 | |
d50171e4 | 3970 | if (debug_threads) |
87ce2a04 | 3971 | debug_printf ("Proceeding, no step-over needed\n"); |
d50171e4 | 3972 | |
7984d532 | 3973 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3974 | } |
3975 | ||
3976 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3977 | pending statuses, are set to run again, except for EXCEPT, if not | |
3978 | NULL. This undoes a stop_all_lwps call. */ | |
3979 | ||
3980 | static void | |
7984d532 | 3981 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3982 | { |
5544ad89 DJ |
3983 | if (debug_threads) |
3984 | { | |
87ce2a04 | 3985 | debug_enter (); |
d50171e4 | 3986 | if (except) |
87ce2a04 DE |
3987 | debug_printf ("unstopping all lwps, except=(LWP %ld)\n", |
3988 | lwpid_of (except)); | |
5544ad89 | 3989 | else |
87ce2a04 | 3990 | debug_printf ("unstopping all lwps\n"); |
5544ad89 DJ |
3991 | } |
3992 | ||
7984d532 PA |
3993 | if (unsuspend) |
3994 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3995 | else | |
3996 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
87ce2a04 DE |
3997 | |
3998 | if (debug_threads) | |
3999 | { | |
4000 | debug_printf ("unstop_all_lwps done\n"); | |
4001 | debug_exit (); | |
4002 | } | |
0d62e5e8 DJ |
4003 | } |
4004 | ||
58caa3dc DJ |
4005 | |
4006 | #ifdef HAVE_LINUX_REGSETS | |
4007 | ||
1faeff08 MR |
4008 | #define use_linux_regsets 1 |
4009 | ||
030031ee PA |
4010 | /* Returns true if REGSET has been disabled. */ |
4011 | ||
4012 | static int | |
4013 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
4014 | { | |
4015 | return (info->disabled_regsets != NULL | |
4016 | && info->disabled_regsets[regset - info->regsets]); | |
4017 | } | |
4018 | ||
4019 | /* Disable REGSET. */ | |
4020 | ||
4021 | static void | |
4022 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
4023 | { | |
4024 | int dr_offset; | |
4025 | ||
4026 | dr_offset = regset - info->regsets; | |
4027 | if (info->disabled_regsets == NULL) | |
4028 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
4029 | info->disabled_regsets[dr_offset] = 1; | |
4030 | } | |
4031 | ||
58caa3dc | 4032 | static int |
3aee8918 PA |
4033 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
4034 | struct regcache *regcache) | |
58caa3dc DJ |
4035 | { |
4036 | struct regset_info *regset; | |
e9d25b98 | 4037 | int saw_general_regs = 0; |
95954743 | 4038 | int pid; |
1570b33e | 4039 | struct iovec iov; |
58caa3dc | 4040 | |
3aee8918 | 4041 | regset = regsets_info->regsets; |
58caa3dc | 4042 | |
95954743 | 4043 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4044 | while (regset->size >= 0) |
4045 | { | |
1570b33e L |
4046 | void *buf, *data; |
4047 | int nt_type, res; | |
58caa3dc | 4048 | |
030031ee | 4049 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4050 | { |
4051 | regset ++; | |
4052 | continue; | |
4053 | } | |
4054 | ||
bca929d3 | 4055 | buf = xmalloc (regset->size); |
1570b33e L |
4056 | |
4057 | nt_type = regset->nt_type; | |
4058 | if (nt_type) | |
4059 | { | |
4060 | iov.iov_base = buf; | |
4061 | iov.iov_len = regset->size; | |
4062 | data = (void *) &iov; | |
4063 | } | |
4064 | else | |
4065 | data = buf; | |
4066 | ||
dfb64f85 | 4067 | #ifndef __sparc__ |
f15f9948 | 4068 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4069 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4070 | #else |
1570b33e | 4071 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4072 | #endif |
58caa3dc DJ |
4073 | if (res < 0) |
4074 | { | |
4075 | if (errno == EIO) | |
4076 | { | |
52fa2412 | 4077 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4078 | this process mode. */ |
030031ee | 4079 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4080 | free (buf); |
52fa2412 | 4081 | continue; |
58caa3dc DJ |
4082 | } |
4083 | else | |
4084 | { | |
0d62e5e8 | 4085 | char s[256]; |
95954743 PA |
4086 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4087 | pid); | |
0d62e5e8 | 4088 | perror (s); |
58caa3dc DJ |
4089 | } |
4090 | } | |
e9d25b98 DJ |
4091 | else if (regset->type == GENERAL_REGS) |
4092 | saw_general_regs = 1; | |
442ea881 | 4093 | regset->store_function (regcache, buf); |
58caa3dc | 4094 | regset ++; |
fdeb2a12 | 4095 | free (buf); |
58caa3dc | 4096 | } |
e9d25b98 DJ |
4097 | if (saw_general_regs) |
4098 | return 0; | |
4099 | else | |
4100 | return 1; | |
58caa3dc DJ |
4101 | } |
4102 | ||
4103 | static int | |
3aee8918 PA |
4104 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4105 | struct regcache *regcache) | |
58caa3dc DJ |
4106 | { |
4107 | struct regset_info *regset; | |
e9d25b98 | 4108 | int saw_general_regs = 0; |
95954743 | 4109 | int pid; |
1570b33e | 4110 | struct iovec iov; |
58caa3dc | 4111 | |
3aee8918 | 4112 | regset = regsets_info->regsets; |
58caa3dc | 4113 | |
95954743 | 4114 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4115 | while (regset->size >= 0) |
4116 | { | |
1570b33e L |
4117 | void *buf, *data; |
4118 | int nt_type, res; | |
58caa3dc | 4119 | |
030031ee | 4120 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4121 | { |
4122 | regset ++; | |
4123 | continue; | |
4124 | } | |
4125 | ||
bca929d3 | 4126 | buf = xmalloc (regset->size); |
545587ee DJ |
4127 | |
4128 | /* First fill the buffer with the current register set contents, | |
4129 | in case there are any items in the kernel's regset that are | |
4130 | not in gdbserver's regcache. */ | |
1570b33e L |
4131 | |
4132 | nt_type = regset->nt_type; | |
4133 | if (nt_type) | |
4134 | { | |
4135 | iov.iov_base = buf; | |
4136 | iov.iov_len = regset->size; | |
4137 | data = (void *) &iov; | |
4138 | } | |
4139 | else | |
4140 | data = buf; | |
4141 | ||
dfb64f85 | 4142 | #ifndef __sparc__ |
f15f9948 | 4143 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4144 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4145 | #else |
689cc2ae | 4146 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4147 | #endif |
545587ee DJ |
4148 | |
4149 | if (res == 0) | |
4150 | { | |
4151 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4152 | regset->fill_function (regcache, buf); |
545587ee DJ |
4153 | |
4154 | /* Only now do we write the register set. */ | |
dfb64f85 | 4155 | #ifndef __sparc__ |
f15f9948 | 4156 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4157 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4158 | #else |
1570b33e | 4159 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4160 | #endif |
545587ee DJ |
4161 | } |
4162 | ||
58caa3dc DJ |
4163 | if (res < 0) |
4164 | { | |
4165 | if (errno == EIO) | |
4166 | { | |
52fa2412 | 4167 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4168 | this process mode. */ |
030031ee | 4169 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4170 | free (buf); |
52fa2412 | 4171 | continue; |
58caa3dc | 4172 | } |
3221518c UW |
4173 | else if (errno == ESRCH) |
4174 | { | |
1b3f6016 PA |
4175 | /* At this point, ESRCH should mean the process is |
4176 | already gone, in which case we simply ignore attempts | |
4177 | to change its registers. See also the related | |
4178 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4179 | free (buf); |
3221518c UW |
4180 | return 0; |
4181 | } | |
58caa3dc DJ |
4182 | else |
4183 | { | |
ce3a066d | 4184 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4185 | } |
4186 | } | |
e9d25b98 DJ |
4187 | else if (regset->type == GENERAL_REGS) |
4188 | saw_general_regs = 1; | |
58caa3dc | 4189 | regset ++; |
09ec9b38 | 4190 | free (buf); |
58caa3dc | 4191 | } |
e9d25b98 DJ |
4192 | if (saw_general_regs) |
4193 | return 0; | |
4194 | else | |
4195 | return 1; | |
58caa3dc DJ |
4196 | } |
4197 | ||
1faeff08 | 4198 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4199 | |
1faeff08 | 4200 | #define use_linux_regsets 0 |
3aee8918 PA |
4201 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4202 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4203 | |
58caa3dc | 4204 | #endif |
1faeff08 MR |
4205 | |
4206 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4207 | calls or 0 if it has to be transferred individually. */ | |
4208 | ||
4209 | static int | |
3aee8918 | 4210 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4211 | { |
4212 | unsigned char mask = 1 << (regno % 8); | |
4213 | size_t index = regno / 8; | |
4214 | ||
4215 | return (use_linux_regsets | |
3aee8918 PA |
4216 | && (regs_info->regset_bitmap == NULL |
4217 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4218 | } |
4219 | ||
58caa3dc | 4220 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4221 | |
4222 | int | |
3aee8918 | 4223 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4224 | { |
4225 | int addr; | |
4226 | ||
3aee8918 | 4227 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4228 | error ("Invalid register number %d.", regnum); |
4229 | ||
3aee8918 | 4230 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4231 | |
4232 | return addr; | |
4233 | } | |
4234 | ||
4235 | /* Fetch one register. */ | |
4236 | static void | |
3aee8918 PA |
4237 | fetch_register (const struct usrregs_info *usrregs, |
4238 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4239 | { |
4240 | CORE_ADDR regaddr; | |
4241 | int i, size; | |
4242 | char *buf; | |
4243 | int pid; | |
4244 | ||
3aee8918 | 4245 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4246 | return; |
4247 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4248 | return; | |
4249 | ||
3aee8918 | 4250 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4251 | if (regaddr == -1) |
4252 | return; | |
4253 | ||
3aee8918 PA |
4254 | size = ((register_size (regcache->tdesc, regno) |
4255 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4256 | & -sizeof (PTRACE_XFER_TYPE)); |
4257 | buf = alloca (size); | |
4258 | ||
4259 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4260 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4261 | { | |
4262 | errno = 0; | |
4263 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4264 | ptrace (PTRACE_PEEKUSER, pid, | |
4265 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4266 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4267 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4268 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4269 | if (errno != 0) | |
4270 | error ("reading register %d: %s", regno, strerror (errno)); | |
4271 | } | |
4272 | ||
4273 | if (the_low_target.supply_ptrace_register) | |
4274 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4275 | else | |
4276 | supply_register (regcache, regno, buf); | |
4277 | } | |
4278 | ||
4279 | /* Store one register. */ | |
4280 | static void | |
3aee8918 PA |
4281 | store_register (const struct usrregs_info *usrregs, |
4282 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4283 | { |
4284 | CORE_ADDR regaddr; | |
4285 | int i, size; | |
4286 | char *buf; | |
4287 | int pid; | |
4288 | ||
3aee8918 | 4289 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4290 | return; |
4291 | if ((*the_low_target.cannot_store_register) (regno)) | |
4292 | return; | |
4293 | ||
3aee8918 | 4294 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4295 | if (regaddr == -1) |
4296 | return; | |
4297 | ||
3aee8918 PA |
4298 | size = ((register_size (regcache->tdesc, regno) |
4299 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4300 | & -sizeof (PTRACE_XFER_TYPE)); |
4301 | buf = alloca (size); | |
4302 | memset (buf, 0, size); | |
4303 | ||
4304 | if (the_low_target.collect_ptrace_register) | |
4305 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4306 | else | |
4307 | collect_register (regcache, regno, buf); | |
4308 | ||
4309 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4310 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4311 | { | |
4312 | errno = 0; | |
4313 | ptrace (PTRACE_POKEUSER, pid, | |
4314 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4315 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4316 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4317 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4318 | if (errno != 0) |
4319 | { | |
4320 | /* At this point, ESRCH should mean the process is | |
4321 | already gone, in which case we simply ignore attempts | |
4322 | to change its registers. See also the related | |
4323 | comment in linux_resume_one_lwp. */ | |
4324 | if (errno == ESRCH) | |
4325 | return; | |
4326 | ||
4327 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4328 | error ("writing register %d: %s", regno, strerror (errno)); | |
4329 | } | |
4330 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4331 | } | |
4332 | } | |
4333 | ||
4334 | /* Fetch all registers, or just one, from the child process. | |
4335 | If REGNO is -1, do this for all registers, skipping any that are | |
4336 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4337 | unless ALL is non-zero. | |
4338 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4339 | static void | |
3aee8918 PA |
4340 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4341 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4342 | { |
3aee8918 PA |
4343 | struct usrregs_info *usr = regs_info->usrregs; |
4344 | ||
1faeff08 MR |
4345 | if (regno == -1) |
4346 | { | |
3aee8918 PA |
4347 | for (regno = 0; regno < usr->num_regs; regno++) |
4348 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4349 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4350 | } |
4351 | else | |
3aee8918 | 4352 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4353 | } |
4354 | ||
4355 | /* Store our register values back into the inferior. | |
4356 | If REGNO is -1, do this for all registers, skipping any that are | |
4357 | assumed to have been saved by regsets_store_inferior_registers, | |
4358 | unless ALL is non-zero. | |
4359 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4360 | static void | |
3aee8918 PA |
4361 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4362 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4363 | { |
3aee8918 PA |
4364 | struct usrregs_info *usr = regs_info->usrregs; |
4365 | ||
1faeff08 MR |
4366 | if (regno == -1) |
4367 | { | |
3aee8918 PA |
4368 | for (regno = 0; regno < usr->num_regs; regno++) |
4369 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4370 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4371 | } |
4372 | else | |
3aee8918 | 4373 | store_register (usr, regcache, regno); |
1faeff08 MR |
4374 | } |
4375 | ||
4376 | #else /* !HAVE_LINUX_USRREGS */ | |
4377 | ||
3aee8918 PA |
4378 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4379 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4380 | |
58caa3dc | 4381 | #endif |
1faeff08 MR |
4382 | |
4383 | ||
4384 | void | |
4385 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4386 | { | |
4387 | int use_regsets; | |
4388 | int all = 0; | |
3aee8918 | 4389 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4390 | |
4391 | if (regno == -1) | |
4392 | { | |
3aee8918 PA |
4393 | if (the_low_target.fetch_register != NULL |
4394 | && regs_info->usrregs != NULL) | |
4395 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4396 | (*the_low_target.fetch_register) (regcache, regno); |
4397 | ||
3aee8918 PA |
4398 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4399 | if (regs_info->usrregs != NULL) | |
4400 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4401 | } |
4402 | else | |
4403 | { | |
c14dfd32 PA |
4404 | if (the_low_target.fetch_register != NULL |
4405 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4406 | return; | |
4407 | ||
3aee8918 | 4408 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4409 | if (use_regsets) |
3aee8918 PA |
4410 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4411 | regcache); | |
4412 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4413 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4414 | } |
58caa3dc DJ |
4415 | } |
4416 | ||
4417 | void | |
442ea881 | 4418 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4419 | { |
1faeff08 MR |
4420 | int use_regsets; |
4421 | int all = 0; | |
3aee8918 | 4422 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4423 | |
4424 | if (regno == -1) | |
4425 | { | |
3aee8918 PA |
4426 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4427 | regcache); | |
4428 | if (regs_info->usrregs != NULL) | |
4429 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4430 | } |
4431 | else | |
4432 | { | |
3aee8918 | 4433 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4434 | if (use_regsets) |
3aee8918 PA |
4435 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4436 | regcache); | |
4437 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4438 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4439 | } |
58caa3dc DJ |
4440 | } |
4441 | ||
da6d8c04 | 4442 | |
da6d8c04 DJ |
4443 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4444 | to debugger memory starting at MYADDR. */ | |
4445 | ||
c3e735a6 | 4446 | static int |
f450004a | 4447 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4448 | { |
4934b29e MR |
4449 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4450 | register PTRACE_XFER_TYPE *buffer; | |
4451 | register CORE_ADDR addr; | |
4452 | register int count; | |
4453 | char filename[64]; | |
da6d8c04 | 4454 | register int i; |
4934b29e | 4455 | int ret; |
fd462a61 | 4456 | int fd; |
fd462a61 DJ |
4457 | |
4458 | /* Try using /proc. Don't bother for one word. */ | |
4459 | if (len >= 3 * sizeof (long)) | |
4460 | { | |
4934b29e MR |
4461 | int bytes; |
4462 | ||
fd462a61 DJ |
4463 | /* We could keep this file open and cache it - possibly one per |
4464 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4465 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4466 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4467 | if (fd == -1) | |
4468 | goto no_proc; | |
4469 | ||
4470 | /* If pread64 is available, use it. It's faster if the kernel | |
4471 | supports it (only one syscall), and it's 64-bit safe even on | |
4472 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4473 | application). */ | |
4474 | #ifdef HAVE_PREAD64 | |
4934b29e | 4475 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4476 | #else |
4934b29e MR |
4477 | bytes = -1; |
4478 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4479 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4480 | #endif |
fd462a61 DJ |
4481 | |
4482 | close (fd); | |
4934b29e MR |
4483 | if (bytes == len) |
4484 | return 0; | |
4485 | ||
4486 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4487 | if (bytes > 0) | |
4488 | { | |
4489 | memaddr += bytes; | |
4490 | myaddr += bytes; | |
4491 | len -= bytes; | |
4492 | } | |
fd462a61 | 4493 | } |
da6d8c04 | 4494 | |
fd462a61 | 4495 | no_proc: |
4934b29e MR |
4496 | /* Round starting address down to longword boundary. */ |
4497 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4498 | /* Round ending address up; get number of longwords that makes. */ | |
4499 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4500 | / sizeof (PTRACE_XFER_TYPE)); | |
4501 | /* Allocate buffer of that many longwords. */ | |
4502 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4503 | ||
da6d8c04 | 4504 | /* Read all the longwords */ |
4934b29e | 4505 | errno = 0; |
da6d8c04 DJ |
4506 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4507 | { | |
14ce3065 DE |
4508 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4509 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4510 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4511 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4512 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4513 | if (errno) |
4934b29e | 4514 | break; |
da6d8c04 | 4515 | } |
4934b29e | 4516 | ret = errno; |
da6d8c04 DJ |
4517 | |
4518 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4519 | if (i > 0) |
4520 | { | |
4521 | i *= sizeof (PTRACE_XFER_TYPE); | |
4522 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4523 | memcpy (myaddr, | |
4524 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4525 | i < len ? i : len); | |
4526 | } | |
c3e735a6 | 4527 | |
4934b29e | 4528 | return ret; |
da6d8c04 DJ |
4529 | } |
4530 | ||
93ae6fdc PA |
4531 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4532 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4533 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4534 | |
ce3a066d | 4535 | static int |
f450004a | 4536 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4537 | { |
4538 | register int i; | |
4539 | /* Round starting address down to longword boundary. */ | |
4540 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4541 | /* Round ending address up; get number of longwords that makes. */ | |
4542 | register int count | |
493e2a69 MS |
4543 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4544 | / sizeof (PTRACE_XFER_TYPE); | |
4545 | ||
da6d8c04 | 4546 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4547 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4548 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4549 | ||
95954743 | 4550 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4551 | |
f0ae6fc3 PA |
4552 | if (len == 0) |
4553 | { | |
4554 | /* Zero length write always succeeds. */ | |
4555 | return 0; | |
4556 | } | |
4557 | ||
0d62e5e8 DJ |
4558 | if (debug_threads) |
4559 | { | |
58d6951d DJ |
4560 | /* Dump up to four bytes. */ |
4561 | unsigned int val = * (unsigned int *) myaddr; | |
4562 | if (len == 1) | |
4563 | val = val & 0xff; | |
4564 | else if (len == 2) | |
4565 | val = val & 0xffff; | |
4566 | else if (len == 3) | |
4567 | val = val & 0xffffff; | |
87ce2a04 DE |
4568 | debug_printf ("Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), |
4569 | val, (long)memaddr); | |
0d62e5e8 DJ |
4570 | } |
4571 | ||
da6d8c04 DJ |
4572 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4573 | ||
93ae6fdc | 4574 | errno = 0; |
14ce3065 DE |
4575 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4576 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4577 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4578 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4579 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4580 | if (errno) |
4581 | return errno; | |
da6d8c04 DJ |
4582 | |
4583 | if (count > 1) | |
4584 | { | |
93ae6fdc | 4585 | errno = 0; |
da6d8c04 | 4586 | buffer[count - 1] |
95954743 | 4587 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4588 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4589 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4590 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4591 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4592 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4593 | if (errno) |
4594 | return errno; | |
da6d8c04 DJ |
4595 | } |
4596 | ||
93ae6fdc | 4597 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4598 | |
493e2a69 MS |
4599 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4600 | myaddr, len); | |
da6d8c04 DJ |
4601 | |
4602 | /* Write the entire buffer. */ | |
4603 | ||
4604 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4605 | { | |
4606 | errno = 0; | |
14ce3065 DE |
4607 | ptrace (PTRACE_POKETEXT, pid, |
4608 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4609 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4610 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4611 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4612 | if (errno) |
4613 | return errno; | |
4614 | } | |
4615 | ||
4616 | return 0; | |
4617 | } | |
2f2893d9 DJ |
4618 | |
4619 | static void | |
4620 | linux_look_up_symbols (void) | |
4621 | { | |
0d62e5e8 | 4622 | #ifdef USE_THREAD_DB |
95954743 PA |
4623 | struct process_info *proc = current_process (); |
4624 | ||
cdbfd419 | 4625 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4626 | return; |
4627 | ||
96d7229d LM |
4628 | /* If the kernel supports tracing clones, then we don't need to |
4629 | use the magic thread event breakpoint to learn about | |
4630 | threads. */ | |
4631 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4632 | #endif |
4633 | } | |
4634 | ||
e5379b03 | 4635 | static void |
ef57601b | 4636 | linux_request_interrupt (void) |
e5379b03 | 4637 | { |
a1928bad | 4638 | extern unsigned long signal_pid; |
e5379b03 | 4639 | |
95954743 PA |
4640 | if (!ptid_equal (cont_thread, null_ptid) |
4641 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4642 | { |
54a0b537 | 4643 | struct lwp_info *lwp; |
bd99dc85 | 4644 | int lwpid; |
e5379b03 | 4645 | |
54a0b537 | 4646 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4647 | lwpid = lwpid_of (lwp); |
4648 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4649 | } |
4650 | else | |
ef57601b | 4651 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4652 | } |
4653 | ||
aa691b87 RM |
4654 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4655 | to debugger memory starting at MYADDR. */ | |
4656 | ||
4657 | static int | |
f450004a | 4658 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4659 | { |
4660 | char filename[PATH_MAX]; | |
4661 | int fd, n; | |
95954743 | 4662 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4663 | |
6cebaf6e | 4664 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4665 | |
4666 | fd = open (filename, O_RDONLY); | |
4667 | if (fd < 0) | |
4668 | return -1; | |
4669 | ||
4670 | if (offset != (CORE_ADDR) 0 | |
4671 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4672 | n = -1; | |
4673 | else | |
4674 | n = read (fd, myaddr, len); | |
4675 | ||
4676 | close (fd); | |
4677 | ||
4678 | return n; | |
4679 | } | |
4680 | ||
d993e290 PA |
4681 | /* These breakpoint and watchpoint related wrapper functions simply |
4682 | pass on the function call if the target has registered a | |
4683 | corresponding function. */ | |
e013ee27 OF |
4684 | |
4685 | static int | |
d993e290 | 4686 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4687 | { |
d993e290 PA |
4688 | if (the_low_target.insert_point != NULL) |
4689 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4690 | else |
4691 | /* Unsupported (see target.h). */ | |
4692 | return 1; | |
4693 | } | |
4694 | ||
4695 | static int | |
d993e290 | 4696 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4697 | { |
d993e290 PA |
4698 | if (the_low_target.remove_point != NULL) |
4699 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4700 | else |
4701 | /* Unsupported (see target.h). */ | |
4702 | return 1; | |
4703 | } | |
4704 | ||
4705 | static int | |
4706 | linux_stopped_by_watchpoint (void) | |
4707 | { | |
c3adc08c PA |
4708 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4709 | ||
4710 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4711 | } |
4712 | ||
4713 | static CORE_ADDR | |
4714 | linux_stopped_data_address (void) | |
4715 | { | |
c3adc08c PA |
4716 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4717 | ||
4718 | return lwp->stopped_data_address; | |
e013ee27 OF |
4719 | } |
4720 | ||
db0dfaa0 LM |
4721 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4722 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4723 | && defined(PT_TEXT_END_ADDR) | |
4724 | ||
4725 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4726 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4727 | the target has different ways of acquiring this information, like | |
4728 | loadmaps. */ | |
52fb6437 NS |
4729 | |
4730 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4731 | to tell gdb about. */ | |
4732 | ||
4733 | static int | |
4734 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4735 | { | |
52fb6437 | 4736 | unsigned long text, text_end, data; |
bd99dc85 | 4737 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4738 | |
4739 | errno = 0; | |
4740 | ||
b8e1b30e LM |
4741 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4742 | (PTRACE_TYPE_ARG4) 0); | |
4743 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4744 | (PTRACE_TYPE_ARG4) 0); | |
4745 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4746 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4747 | |
4748 | if (errno == 0) | |
4749 | { | |
4750 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4751 | used by gdb) are relative to the beginning of the program, |
4752 | with the data segment immediately following the text segment. | |
4753 | However, the actual runtime layout in memory may put the data | |
4754 | somewhere else, so when we send gdb a data base-address, we | |
4755 | use the real data base address and subtract the compile-time | |
4756 | data base-address from it (which is just the length of the | |
4757 | text segment). BSS immediately follows data in both | |
4758 | cases. */ | |
52fb6437 NS |
4759 | *text_p = text; |
4760 | *data_p = data - (text_end - text); | |
1b3f6016 | 4761 | |
52fb6437 NS |
4762 | return 1; |
4763 | } | |
52fb6437 NS |
4764 | return 0; |
4765 | } | |
4766 | #endif | |
4767 | ||
07e059b5 VP |
4768 | static int |
4769 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4770 | unsigned char *readbuf, unsigned const char *writebuf, |
4771 | CORE_ADDR offset, int len) | |
07e059b5 | 4772 | { |
d26e3629 | 4773 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4774 | } |
4775 | ||
d0722149 DE |
4776 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4777 | layout of the inferiors' architecture. */ | |
4778 | ||
4779 | static void | |
a5362b9a | 4780 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4781 | { |
4782 | int done = 0; | |
4783 | ||
4784 | if (the_low_target.siginfo_fixup != NULL) | |
4785 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4786 | ||
4787 | /* If there was no callback, or the callback didn't do anything, | |
4788 | then just do a straight memcpy. */ | |
4789 | if (!done) | |
4790 | { | |
4791 | if (direction == 1) | |
a5362b9a | 4792 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4793 | else |
a5362b9a | 4794 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4795 | } |
4796 | } | |
4797 | ||
4aa995e1 PA |
4798 | static int |
4799 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4800 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4801 | { | |
d0722149 | 4802 | int pid; |
a5362b9a TS |
4803 | siginfo_t siginfo; |
4804 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4805 | |
4806 | if (current_inferior == NULL) | |
4807 | return -1; | |
4808 | ||
bd99dc85 | 4809 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4810 | |
4811 | if (debug_threads) | |
87ce2a04 DE |
4812 | debug_printf ("%s siginfo for lwp %d.\n", |
4813 | readbuf != NULL ? "Reading" : "Writing", | |
4814 | pid); | |
4aa995e1 | 4815 | |
0adea5f7 | 4816 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4817 | return -1; |
4818 | ||
b8e1b30e | 4819 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4820 | return -1; |
4821 | ||
d0722149 DE |
4822 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4823 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4824 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4825 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4826 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4827 | ||
4aa995e1 PA |
4828 | if (offset + len > sizeof (siginfo)) |
4829 | len = sizeof (siginfo) - offset; | |
4830 | ||
4831 | if (readbuf != NULL) | |
d0722149 | 4832 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4833 | else |
4834 | { | |
d0722149 DE |
4835 | memcpy (inf_siginfo + offset, writebuf, len); |
4836 | ||
4837 | /* Convert back to ptrace layout before flushing it out. */ | |
4838 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4839 | ||
b8e1b30e | 4840 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4841 | return -1; |
4842 | } | |
4843 | ||
4844 | return len; | |
4845 | } | |
4846 | ||
bd99dc85 PA |
4847 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4848 | so we notice when children change state; as the handler for the | |
4849 | sigsuspend in my_waitpid. */ | |
4850 | ||
4851 | static void | |
4852 | sigchld_handler (int signo) | |
4853 | { | |
4854 | int old_errno = errno; | |
4855 | ||
4856 | if (debug_threads) | |
e581f2b4 PA |
4857 | { |
4858 | do | |
4859 | { | |
4860 | /* fprintf is not async-signal-safe, so call write | |
4861 | directly. */ | |
4862 | if (write (2, "sigchld_handler\n", | |
4863 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4864 | break; /* just ignore */ | |
4865 | } while (0); | |
4866 | } | |
bd99dc85 PA |
4867 | |
4868 | if (target_is_async_p ()) | |
4869 | async_file_mark (); /* trigger a linux_wait */ | |
4870 | ||
4871 | errno = old_errno; | |
4872 | } | |
4873 | ||
4874 | static int | |
4875 | linux_supports_non_stop (void) | |
4876 | { | |
4877 | return 1; | |
4878 | } | |
4879 | ||
4880 | static int | |
4881 | linux_async (int enable) | |
4882 | { | |
4883 | int previous = (linux_event_pipe[0] != -1); | |
4884 | ||
8336d594 | 4885 | if (debug_threads) |
87ce2a04 DE |
4886 | debug_printf ("linux_async (%d), previous=%d\n", |
4887 | enable, previous); | |
8336d594 | 4888 | |
bd99dc85 PA |
4889 | if (previous != enable) |
4890 | { | |
4891 | sigset_t mask; | |
4892 | sigemptyset (&mask); | |
4893 | sigaddset (&mask, SIGCHLD); | |
4894 | ||
4895 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4896 | ||
4897 | if (enable) | |
4898 | { | |
4899 | if (pipe (linux_event_pipe) == -1) | |
4900 | fatal ("creating event pipe failed."); | |
4901 | ||
4902 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4903 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4904 | ||
4905 | /* Register the event loop handler. */ | |
4906 | add_file_handler (linux_event_pipe[0], | |
4907 | handle_target_event, NULL); | |
4908 | ||
4909 | /* Always trigger a linux_wait. */ | |
4910 | async_file_mark (); | |
4911 | } | |
4912 | else | |
4913 | { | |
4914 | delete_file_handler (linux_event_pipe[0]); | |
4915 | ||
4916 | close (linux_event_pipe[0]); | |
4917 | close (linux_event_pipe[1]); | |
4918 | linux_event_pipe[0] = -1; | |
4919 | linux_event_pipe[1] = -1; | |
4920 | } | |
4921 | ||
4922 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4923 | } | |
4924 | ||
4925 | return previous; | |
4926 | } | |
4927 | ||
4928 | static int | |
4929 | linux_start_non_stop (int nonstop) | |
4930 | { | |
4931 | /* Register or unregister from event-loop accordingly. */ | |
4932 | linux_async (nonstop); | |
4933 | return 0; | |
4934 | } | |
4935 | ||
cf8fd78b PA |
4936 | static int |
4937 | linux_supports_multi_process (void) | |
4938 | { | |
4939 | return 1; | |
4940 | } | |
4941 | ||
03583c20 UW |
4942 | static int |
4943 | linux_supports_disable_randomization (void) | |
4944 | { | |
4945 | #ifdef HAVE_PERSONALITY | |
4946 | return 1; | |
4947 | #else | |
4948 | return 0; | |
4949 | #endif | |
4950 | } | |
efcbbd14 | 4951 | |
d1feda86 YQ |
4952 | static int |
4953 | linux_supports_agent (void) | |
4954 | { | |
4955 | return 1; | |
4956 | } | |
4957 | ||
c2d6af84 PA |
4958 | static int |
4959 | linux_supports_range_stepping (void) | |
4960 | { | |
4961 | if (*the_low_target.supports_range_stepping == NULL) | |
4962 | return 0; | |
4963 | ||
4964 | return (*the_low_target.supports_range_stepping) (); | |
4965 | } | |
4966 | ||
efcbbd14 UW |
4967 | /* Enumerate spufs IDs for process PID. */ |
4968 | static int | |
4969 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4970 | { | |
4971 | int pos = 0; | |
4972 | int written = 0; | |
4973 | char path[128]; | |
4974 | DIR *dir; | |
4975 | struct dirent *entry; | |
4976 | ||
4977 | sprintf (path, "/proc/%ld/fd", pid); | |
4978 | dir = opendir (path); | |
4979 | if (!dir) | |
4980 | return -1; | |
4981 | ||
4982 | rewinddir (dir); | |
4983 | while ((entry = readdir (dir)) != NULL) | |
4984 | { | |
4985 | struct stat st; | |
4986 | struct statfs stfs; | |
4987 | int fd; | |
4988 | ||
4989 | fd = atoi (entry->d_name); | |
4990 | if (!fd) | |
4991 | continue; | |
4992 | ||
4993 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4994 | if (stat (path, &st) != 0) | |
4995 | continue; | |
4996 | if (!S_ISDIR (st.st_mode)) | |
4997 | continue; | |
4998 | ||
4999 | if (statfs (path, &stfs) != 0) | |
5000 | continue; | |
5001 | if (stfs.f_type != SPUFS_MAGIC) | |
5002 | continue; | |
5003 | ||
5004 | if (pos >= offset && pos + 4 <= offset + len) | |
5005 | { | |
5006 | *(unsigned int *)(buf + pos - offset) = fd; | |
5007 | written += 4; | |
5008 | } | |
5009 | pos += 4; | |
5010 | } | |
5011 | ||
5012 | closedir (dir); | |
5013 | return written; | |
5014 | } | |
5015 | ||
5016 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5017 | object type, using the /proc file system. */ | |
5018 | static int | |
5019 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
5020 | unsigned const char *writebuf, | |
5021 | CORE_ADDR offset, int len) | |
5022 | { | |
5023 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5024 | char buf[128]; | |
5025 | int fd = 0; | |
5026 | int ret = 0; | |
5027 | ||
5028 | if (!writebuf && !readbuf) | |
5029 | return -1; | |
5030 | ||
5031 | if (!*annex) | |
5032 | { | |
5033 | if (!readbuf) | |
5034 | return -1; | |
5035 | else | |
5036 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5037 | } | |
5038 | ||
5039 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5040 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5041 | if (fd <= 0) | |
5042 | return -1; | |
5043 | ||
5044 | if (offset != 0 | |
5045 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5046 | { | |
5047 | close (fd); | |
5048 | return 0; | |
5049 | } | |
5050 | ||
5051 | if (writebuf) | |
5052 | ret = write (fd, writebuf, (size_t) len); | |
5053 | else | |
5054 | ret = read (fd, readbuf, (size_t) len); | |
5055 | ||
5056 | close (fd); | |
5057 | return ret; | |
5058 | } | |
5059 | ||
723b724b | 5060 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5061 | struct target_loadseg |
5062 | { | |
5063 | /* Core address to which the segment is mapped. */ | |
5064 | Elf32_Addr addr; | |
5065 | /* VMA recorded in the program header. */ | |
5066 | Elf32_Addr p_vaddr; | |
5067 | /* Size of this segment in memory. */ | |
5068 | Elf32_Word p_memsz; | |
5069 | }; | |
5070 | ||
723b724b | 5071 | # if defined PT_GETDSBT |
78d85199 YQ |
5072 | struct target_loadmap |
5073 | { | |
5074 | /* Protocol version number, must be zero. */ | |
5075 | Elf32_Word version; | |
5076 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5077 | unsigned *dsbt_table; | |
5078 | unsigned dsbt_size, dsbt_index; | |
5079 | /* Number of segments in this map. */ | |
5080 | Elf32_Word nsegs; | |
5081 | /* The actual memory map. */ | |
5082 | struct target_loadseg segs[/*nsegs*/]; | |
5083 | }; | |
723b724b MF |
5084 | # define LINUX_LOADMAP PT_GETDSBT |
5085 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5086 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5087 | # else | |
5088 | struct target_loadmap | |
5089 | { | |
5090 | /* Protocol version number, must be zero. */ | |
5091 | Elf32_Half version; | |
5092 | /* Number of segments in this map. */ | |
5093 | Elf32_Half nsegs; | |
5094 | /* The actual memory map. */ | |
5095 | struct target_loadseg segs[/*nsegs*/]; | |
5096 | }; | |
5097 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5098 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5099 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5100 | # endif | |
78d85199 | 5101 | |
78d85199 YQ |
5102 | static int |
5103 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5104 | unsigned char *myaddr, unsigned int len) | |
5105 | { | |
5106 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5107 | int addr = -1; | |
5108 | struct target_loadmap *data = NULL; | |
5109 | unsigned int actual_length, copy_length; | |
5110 | ||
5111 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5112 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5113 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5114 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5115 | else |
5116 | return -1; | |
5117 | ||
723b724b | 5118 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5119 | return -1; |
5120 | ||
5121 | if (data == NULL) | |
5122 | return -1; | |
5123 | ||
5124 | actual_length = sizeof (struct target_loadmap) | |
5125 | + sizeof (struct target_loadseg) * data->nsegs; | |
5126 | ||
5127 | if (offset < 0 || offset > actual_length) | |
5128 | return -1; | |
5129 | ||
5130 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5131 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5132 | return copy_length; | |
5133 | } | |
723b724b MF |
5134 | #else |
5135 | # define linux_read_loadmap NULL | |
5136 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5137 | |
1570b33e L |
5138 | static void |
5139 | linux_process_qsupported (const char *query) | |
5140 | { | |
5141 | if (the_low_target.process_qsupported != NULL) | |
5142 | the_low_target.process_qsupported (query); | |
5143 | } | |
5144 | ||
219f2f23 PA |
5145 | static int |
5146 | linux_supports_tracepoints (void) | |
5147 | { | |
5148 | if (*the_low_target.supports_tracepoints == NULL) | |
5149 | return 0; | |
5150 | ||
5151 | return (*the_low_target.supports_tracepoints) (); | |
5152 | } | |
5153 | ||
5154 | static CORE_ADDR | |
5155 | linux_read_pc (struct regcache *regcache) | |
5156 | { | |
5157 | if (the_low_target.get_pc == NULL) | |
5158 | return 0; | |
5159 | ||
5160 | return (*the_low_target.get_pc) (regcache); | |
5161 | } | |
5162 | ||
5163 | static void | |
5164 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5165 | { | |
5166 | gdb_assert (the_low_target.set_pc != NULL); | |
5167 | ||
5168 | (*the_low_target.set_pc) (regcache, pc); | |
5169 | } | |
5170 | ||
8336d594 PA |
5171 | static int |
5172 | linux_thread_stopped (struct thread_info *thread) | |
5173 | { | |
5174 | return get_thread_lwp (thread)->stopped; | |
5175 | } | |
5176 | ||
5177 | /* This exposes stop-all-threads functionality to other modules. */ | |
5178 | ||
5179 | static void | |
7984d532 | 5180 | linux_pause_all (int freeze) |
8336d594 | 5181 | { |
7984d532 PA |
5182 | stop_all_lwps (freeze, NULL); |
5183 | } | |
5184 | ||
5185 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5186 | modules. */ | |
5187 | ||
5188 | static void | |
5189 | linux_unpause_all (int unfreeze) | |
5190 | { | |
5191 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5192 | } |
5193 | ||
90d74c30 PA |
5194 | static int |
5195 | linux_prepare_to_access_memory (void) | |
5196 | { | |
5197 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5198 | running LWP. */ | |
5199 | if (non_stop) | |
5200 | linux_pause_all (1); | |
5201 | return 0; | |
5202 | } | |
5203 | ||
5204 | static void | |
0146f85b | 5205 | linux_done_accessing_memory (void) |
90d74c30 PA |
5206 | { |
5207 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5208 | running LWP. */ | |
5209 | if (non_stop) | |
5210 | linux_unpause_all (1); | |
5211 | } | |
5212 | ||
fa593d66 PA |
5213 | static int |
5214 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5215 | CORE_ADDR collector, | |
5216 | CORE_ADDR lockaddr, | |
5217 | ULONGEST orig_size, | |
5218 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5219 | CORE_ADDR *trampoline, |
5220 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5221 | unsigned char *jjump_pad_insn, |
5222 | ULONGEST *jjump_pad_insn_size, | |
5223 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5224 | CORE_ADDR *adjusted_insn_addr_end, |
5225 | char *err) | |
fa593d66 PA |
5226 | { |
5227 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5228 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5229 | jump_entry, trampoline, trampoline_size, |
5230 | jjump_pad_insn, jjump_pad_insn_size, | |
5231 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5232 | err); | |
fa593d66 PA |
5233 | } |
5234 | ||
6a271cae PA |
5235 | static struct emit_ops * |
5236 | linux_emit_ops (void) | |
5237 | { | |
5238 | if (the_low_target.emit_ops != NULL) | |
5239 | return (*the_low_target.emit_ops) (); | |
5240 | else | |
5241 | return NULL; | |
5242 | } | |
5243 | ||
405f8e94 SS |
5244 | static int |
5245 | linux_get_min_fast_tracepoint_insn_len (void) | |
5246 | { | |
5247 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5248 | } | |
5249 | ||
2268b414 JK |
5250 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5251 | ||
5252 | static int | |
5253 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5254 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5255 | { | |
5256 | char filename[PATH_MAX]; | |
5257 | int fd; | |
5258 | const int auxv_size = is_elf64 | |
5259 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5260 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5261 | ||
5262 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5263 | ||
5264 | fd = open (filename, O_RDONLY); | |
5265 | if (fd < 0) | |
5266 | return 1; | |
5267 | ||
5268 | *phdr_memaddr = 0; | |
5269 | *num_phdr = 0; | |
5270 | while (read (fd, buf, auxv_size) == auxv_size | |
5271 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5272 | { | |
5273 | if (is_elf64) | |
5274 | { | |
5275 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5276 | ||
5277 | switch (aux->a_type) | |
5278 | { | |
5279 | case AT_PHDR: | |
5280 | *phdr_memaddr = aux->a_un.a_val; | |
5281 | break; | |
5282 | case AT_PHNUM: | |
5283 | *num_phdr = aux->a_un.a_val; | |
5284 | break; | |
5285 | } | |
5286 | } | |
5287 | else | |
5288 | { | |
5289 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5290 | ||
5291 | switch (aux->a_type) | |
5292 | { | |
5293 | case AT_PHDR: | |
5294 | *phdr_memaddr = aux->a_un.a_val; | |
5295 | break; | |
5296 | case AT_PHNUM: | |
5297 | *num_phdr = aux->a_un.a_val; | |
5298 | break; | |
5299 | } | |
5300 | } | |
5301 | } | |
5302 | ||
5303 | close (fd); | |
5304 | ||
5305 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5306 | { | |
5307 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5308 | "phdr_memaddr = %ld, phdr_num = %d", | |
5309 | (long) *phdr_memaddr, *num_phdr); | |
5310 | return 2; | |
5311 | } | |
5312 | ||
5313 | return 0; | |
5314 | } | |
5315 | ||
5316 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5317 | ||
5318 | static CORE_ADDR | |
5319 | get_dynamic (const int pid, const int is_elf64) | |
5320 | { | |
5321 | CORE_ADDR phdr_memaddr, relocation; | |
5322 | int num_phdr, i; | |
5323 | unsigned char *phdr_buf; | |
5324 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5325 | ||
5326 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5327 | return 0; | |
5328 | ||
5329 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5330 | phdr_buf = alloca (num_phdr * phdr_size); | |
5331 | ||
5332 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5333 | return 0; | |
5334 | ||
5335 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5336 | non-zero for PIE ones. */ | |
5337 | relocation = -1; | |
5338 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5339 | if (is_elf64) | |
5340 | { | |
5341 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5342 | ||
5343 | if (p->p_type == PT_PHDR) | |
5344 | relocation = phdr_memaddr - p->p_vaddr; | |
5345 | } | |
5346 | else | |
5347 | { | |
5348 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5349 | ||
5350 | if (p->p_type == PT_PHDR) | |
5351 | relocation = phdr_memaddr - p->p_vaddr; | |
5352 | } | |
5353 | ||
5354 | if (relocation == -1) | |
5355 | { | |
e237a7e2 JK |
5356 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5357 | any real world executables, including PIE executables, have always | |
5358 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5359 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5360 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5361 | ||
5362 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5363 | ||
5364 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5365 | ||
2268b414 JK |
5366 | return 0; |
5367 | } | |
5368 | ||
5369 | for (i = 0; i < num_phdr; i++) | |
5370 | { | |
5371 | if (is_elf64) | |
5372 | { | |
5373 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5374 | ||
5375 | if (p->p_type == PT_DYNAMIC) | |
5376 | return p->p_vaddr + relocation; | |
5377 | } | |
5378 | else | |
5379 | { | |
5380 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5381 | ||
5382 | if (p->p_type == PT_DYNAMIC) | |
5383 | return p->p_vaddr + relocation; | |
5384 | } | |
5385 | } | |
5386 | ||
5387 | return 0; | |
5388 | } | |
5389 | ||
5390 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5391 | can be 0 if the inferior does not yet have the library list initialized. |
5392 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5393 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5394 | |
5395 | static CORE_ADDR | |
5396 | get_r_debug (const int pid, const int is_elf64) | |
5397 | { | |
5398 | CORE_ADDR dynamic_memaddr; | |
5399 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5400 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5401 | CORE_ADDR map = -1; |
2268b414 JK |
5402 | |
5403 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5404 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5405 | return map; |
2268b414 JK |
5406 | |
5407 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5408 | { | |
5409 | if (is_elf64) | |
5410 | { | |
5411 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5412 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5413 | union |
5414 | { | |
5415 | Elf64_Xword map; | |
5416 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5417 | } | |
5418 | rld_map; | |
5419 | ||
5420 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5421 | { | |
5422 | if (linux_read_memory (dyn->d_un.d_val, | |
5423 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5424 | return rld_map.map; | |
5425 | else | |
5426 | break; | |
5427 | } | |
75f62ce7 | 5428 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5429 | |
367ba2c2 MR |
5430 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5431 | map = dyn->d_un.d_val; | |
2268b414 JK |
5432 | |
5433 | if (dyn->d_tag == DT_NULL) | |
5434 | break; | |
5435 | } | |
5436 | else | |
5437 | { | |
5438 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5439 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5440 | union |
5441 | { | |
5442 | Elf32_Word map; | |
5443 | unsigned char buf[sizeof (Elf32_Word)]; | |
5444 | } | |
5445 | rld_map; | |
5446 | ||
5447 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5448 | { | |
5449 | if (linux_read_memory (dyn->d_un.d_val, | |
5450 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5451 | return rld_map.map; | |
5452 | else | |
5453 | break; | |
5454 | } | |
75f62ce7 | 5455 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5456 | |
367ba2c2 MR |
5457 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5458 | map = dyn->d_un.d_val; | |
2268b414 JK |
5459 | |
5460 | if (dyn->d_tag == DT_NULL) | |
5461 | break; | |
5462 | } | |
5463 | ||
5464 | dynamic_memaddr += dyn_size; | |
5465 | } | |
5466 | ||
367ba2c2 | 5467 | return map; |
2268b414 JK |
5468 | } |
5469 | ||
5470 | /* Read one pointer from MEMADDR in the inferior. */ | |
5471 | ||
5472 | static int | |
5473 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5474 | { | |
485f1ee4 PA |
5475 | int ret; |
5476 | ||
5477 | /* Go through a union so this works on either big or little endian | |
5478 | hosts, when the inferior's pointer size is smaller than the size | |
5479 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5480 | same of the superior's. */ | |
5481 | union | |
5482 | { | |
5483 | CORE_ADDR core_addr; | |
5484 | unsigned int ui; | |
5485 | unsigned char uc; | |
5486 | } addr; | |
5487 | ||
5488 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5489 | if (ret == 0) | |
5490 | { | |
5491 | if (ptr_size == sizeof (CORE_ADDR)) | |
5492 | *ptr = addr.core_addr; | |
5493 | else if (ptr_size == sizeof (unsigned int)) | |
5494 | *ptr = addr.ui; | |
5495 | else | |
5496 | gdb_assert_not_reached ("unhandled pointer size"); | |
5497 | } | |
5498 | return ret; | |
2268b414 JK |
5499 | } |
5500 | ||
5501 | struct link_map_offsets | |
5502 | { | |
5503 | /* Offset and size of r_debug.r_version. */ | |
5504 | int r_version_offset; | |
5505 | ||
5506 | /* Offset and size of r_debug.r_map. */ | |
5507 | int r_map_offset; | |
5508 | ||
5509 | /* Offset to l_addr field in struct link_map. */ | |
5510 | int l_addr_offset; | |
5511 | ||
5512 | /* Offset to l_name field in struct link_map. */ | |
5513 | int l_name_offset; | |
5514 | ||
5515 | /* Offset to l_ld field in struct link_map. */ | |
5516 | int l_ld_offset; | |
5517 | ||
5518 | /* Offset to l_next field in struct link_map. */ | |
5519 | int l_next_offset; | |
5520 | ||
5521 | /* Offset to l_prev field in struct link_map. */ | |
5522 | int l_prev_offset; | |
5523 | }; | |
5524 | ||
fb723180 | 5525 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5526 | |
5527 | static int | |
5528 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5529 | unsigned const char *writebuf, | |
5530 | CORE_ADDR offset, int len) | |
5531 | { | |
5532 | char *document; | |
5533 | unsigned document_len; | |
5534 | struct process_info_private *const priv = current_process ()->private; | |
5535 | char filename[PATH_MAX]; | |
5536 | int pid, is_elf64; | |
5537 | ||
5538 | static const struct link_map_offsets lmo_32bit_offsets = | |
5539 | { | |
5540 | 0, /* r_version offset. */ | |
5541 | 4, /* r_debug.r_map offset. */ | |
5542 | 0, /* l_addr offset in link_map. */ | |
5543 | 4, /* l_name offset in link_map. */ | |
5544 | 8, /* l_ld offset in link_map. */ | |
5545 | 12, /* l_next offset in link_map. */ | |
5546 | 16 /* l_prev offset in link_map. */ | |
5547 | }; | |
5548 | ||
5549 | static const struct link_map_offsets lmo_64bit_offsets = | |
5550 | { | |
5551 | 0, /* r_version offset. */ | |
5552 | 8, /* r_debug.r_map offset. */ | |
5553 | 0, /* l_addr offset in link_map. */ | |
5554 | 8, /* l_name offset in link_map. */ | |
5555 | 16, /* l_ld offset in link_map. */ | |
5556 | 24, /* l_next offset in link_map. */ | |
5557 | 32 /* l_prev offset in link_map. */ | |
5558 | }; | |
5559 | const struct link_map_offsets *lmo; | |
214d508e | 5560 | unsigned int machine; |
b1fbec62 GB |
5561 | int ptr_size; |
5562 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5563 | int allocated = 1024; | |
5564 | char *p; | |
5565 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5566 | int header_done = 0; | |
2268b414 JK |
5567 | |
5568 | if (writebuf != NULL) | |
5569 | return -2; | |
5570 | if (readbuf == NULL) | |
5571 | return -1; | |
5572 | ||
5573 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5574 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5575 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5576 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5577 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5578 | |
b1fbec62 GB |
5579 | while (annex[0] != '\0') |
5580 | { | |
5581 | const char *sep; | |
5582 | CORE_ADDR *addrp; | |
5583 | int len; | |
2268b414 | 5584 | |
b1fbec62 GB |
5585 | sep = strchr (annex, '='); |
5586 | if (sep == NULL) | |
5587 | break; | |
0c5bf5a9 | 5588 | |
b1fbec62 GB |
5589 | len = sep - annex; |
5590 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5591 | addrp = &lm_addr; | |
5592 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5593 | addrp = &lm_prev; | |
5594 | else | |
5595 | { | |
5596 | annex = strchr (sep, ';'); | |
5597 | if (annex == NULL) | |
5598 | break; | |
5599 | annex++; | |
5600 | continue; | |
5601 | } | |
5602 | ||
5603 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5604 | } |
b1fbec62 GB |
5605 | |
5606 | if (lm_addr == 0) | |
2268b414 | 5607 | { |
b1fbec62 GB |
5608 | int r_version = 0; |
5609 | ||
5610 | if (priv->r_debug == 0) | |
5611 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5612 | ||
5613 | /* We failed to find DT_DEBUG. Such situation will not change | |
5614 | for this inferior - do not retry it. Report it to GDB as | |
5615 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5616 | if (priv->r_debug == (CORE_ADDR) -1) | |
5617 | return -1; | |
5618 | ||
5619 | if (priv->r_debug != 0) | |
2268b414 | 5620 | { |
b1fbec62 GB |
5621 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5622 | (unsigned char *) &r_version, | |
5623 | sizeof (r_version)) != 0 | |
5624 | || r_version != 1) | |
5625 | { | |
5626 | warning ("unexpected r_debug version %d", r_version); | |
5627 | } | |
5628 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5629 | &lm_addr, ptr_size) != 0) | |
5630 | { | |
5631 | warning ("unable to read r_map from 0x%lx", | |
5632 | (long) priv->r_debug + lmo->r_map_offset); | |
5633 | } | |
2268b414 | 5634 | } |
b1fbec62 | 5635 | } |
2268b414 | 5636 | |
b1fbec62 GB |
5637 | document = xmalloc (allocated); |
5638 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5639 | p = document + strlen (document); | |
5640 | ||
5641 | while (lm_addr | |
5642 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5643 | &l_name, ptr_size) == 0 | |
5644 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5645 | &l_addr, ptr_size) == 0 | |
5646 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5647 | &l_ld, ptr_size) == 0 | |
5648 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5649 | &l_prev, ptr_size) == 0 | |
5650 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5651 | &l_next, ptr_size) == 0) | |
5652 | { | |
5653 | unsigned char libname[PATH_MAX]; | |
5654 | ||
5655 | if (lm_prev != l_prev) | |
2268b414 | 5656 | { |
b1fbec62 GB |
5657 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5658 | (long) lm_prev, (long) l_prev); | |
5659 | break; | |
2268b414 JK |
5660 | } |
5661 | ||
d878444c JK |
5662 | /* Ignore the first entry even if it has valid name as the first entry |
5663 | corresponds to the main executable. The first entry should not be | |
5664 | skipped if the dynamic loader was loaded late by a static executable | |
5665 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5666 | executable does not have PT_DYNAMIC present and this function already | |
5667 | exited above due to failed get_r_debug. */ | |
5668 | if (lm_prev == 0) | |
2268b414 | 5669 | { |
d878444c JK |
5670 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5671 | p = p + strlen (p); | |
5672 | } | |
5673 | else | |
5674 | { | |
5675 | /* Not checking for error because reading may stop before | |
5676 | we've got PATH_MAX worth of characters. */ | |
5677 | libname[0] = '\0'; | |
5678 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5679 | libname[sizeof (libname) - 1] = '\0'; | |
5680 | if (libname[0] != '\0') | |
2268b414 | 5681 | { |
d878444c JK |
5682 | /* 6x the size for xml_escape_text below. */ |
5683 | size_t len = 6 * strlen ((char *) libname); | |
5684 | char *name; | |
2268b414 | 5685 | |
d878444c JK |
5686 | if (!header_done) |
5687 | { | |
5688 | /* Terminate `<library-list-svr4'. */ | |
5689 | *p++ = '>'; | |
5690 | header_done = 1; | |
5691 | } | |
2268b414 | 5692 | |
d878444c JK |
5693 | while (allocated < p - document + len + 200) |
5694 | { | |
5695 | /* Expand to guarantee sufficient storage. */ | |
5696 | uintptr_t document_len = p - document; | |
2268b414 | 5697 | |
d878444c JK |
5698 | document = xrealloc (document, 2 * allocated); |
5699 | allocated *= 2; | |
5700 | p = document + document_len; | |
5701 | } | |
5702 | ||
5703 | name = xml_escape_text ((char *) libname); | |
5704 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5705 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5706 | name, (unsigned long) lm_addr, | |
5707 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5708 | free (name); | |
5709 | } | |
0afae3cf | 5710 | } |
b1fbec62 GB |
5711 | |
5712 | lm_prev = lm_addr; | |
5713 | lm_addr = l_next; | |
2268b414 JK |
5714 | } |
5715 | ||
b1fbec62 GB |
5716 | if (!header_done) |
5717 | { | |
5718 | /* Empty list; terminate `<library-list-svr4'. */ | |
5719 | strcpy (p, "/>"); | |
5720 | } | |
5721 | else | |
5722 | strcpy (p, "</library-list-svr4>"); | |
5723 | ||
2268b414 JK |
5724 | document_len = strlen (document); |
5725 | if (offset < document_len) | |
5726 | document_len -= offset; | |
5727 | else | |
5728 | document_len = 0; | |
5729 | if (len > document_len) | |
5730 | len = document_len; | |
5731 | ||
5732 | memcpy (readbuf, document + offset, len); | |
5733 | xfree (document); | |
5734 | ||
5735 | return len; | |
5736 | } | |
5737 | ||
9accd112 MM |
5738 | #ifdef HAVE_LINUX_BTRACE |
5739 | ||
969c39fb | 5740 | /* See to_enable_btrace target method. */ |
9accd112 MM |
5741 | |
5742 | static struct btrace_target_info * | |
5743 | linux_low_enable_btrace (ptid_t ptid) | |
5744 | { | |
5745 | struct btrace_target_info *tinfo; | |
5746 | ||
5747 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5748 | |
9accd112 | 5749 | if (tinfo != NULL) |
3aee8918 PA |
5750 | { |
5751 | struct thread_info *thread = find_thread_ptid (ptid); | |
5752 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5753 | ||
5754 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5755 | } | |
9accd112 MM |
5756 | |
5757 | return tinfo; | |
5758 | } | |
5759 | ||
969c39fb | 5760 | /* See to_disable_btrace target method. */ |
9accd112 | 5761 | |
969c39fb MM |
5762 | static int |
5763 | linux_low_disable_btrace (struct btrace_target_info *tinfo) | |
5764 | { | |
5765 | enum btrace_error err; | |
5766 | ||
5767 | err = linux_disable_btrace (tinfo); | |
5768 | return (err == BTRACE_ERR_NONE ? 0 : -1); | |
5769 | } | |
5770 | ||
5771 | /* See to_read_btrace target method. */ | |
5772 | ||
5773 | static int | |
9accd112 MM |
5774 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, |
5775 | int type) | |
5776 | { | |
5777 | VEC (btrace_block_s) *btrace; | |
5778 | struct btrace_block *block; | |
969c39fb | 5779 | enum btrace_error err; |
9accd112 MM |
5780 | int i; |
5781 | ||
969c39fb MM |
5782 | btrace = NULL; |
5783 | err = linux_read_btrace (&btrace, tinfo, type); | |
5784 | if (err != BTRACE_ERR_NONE) | |
5785 | { | |
5786 | if (err == BTRACE_ERR_OVERFLOW) | |
5787 | buffer_grow_str0 (buffer, "E.Overflow."); | |
5788 | else | |
5789 | buffer_grow_str0 (buffer, "E.Generic Error."); | |
5790 | ||
5791 | return -1; | |
5792 | } | |
9accd112 MM |
5793 | |
5794 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5795 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5796 | ||
5797 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5798 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5799 | paddress (block->begin), paddress (block->end)); | |
5800 | ||
969c39fb | 5801 | buffer_grow_str0 (buffer, "</btrace>\n"); |
9accd112 MM |
5802 | |
5803 | VEC_free (btrace_block_s, btrace); | |
969c39fb MM |
5804 | |
5805 | return 0; | |
9accd112 MM |
5806 | } |
5807 | #endif /* HAVE_LINUX_BTRACE */ | |
5808 | ||
ce3a066d DJ |
5809 | static struct target_ops linux_target_ops = { |
5810 | linux_create_inferior, | |
5811 | linux_attach, | |
5812 | linux_kill, | |
6ad8ae5c | 5813 | linux_detach, |
8336d594 | 5814 | linux_mourn, |
444d6139 | 5815 | linux_join, |
ce3a066d DJ |
5816 | linux_thread_alive, |
5817 | linux_resume, | |
5818 | linux_wait, | |
5819 | linux_fetch_registers, | |
5820 | linux_store_registers, | |
90d74c30 | 5821 | linux_prepare_to_access_memory, |
0146f85b | 5822 | linux_done_accessing_memory, |
ce3a066d DJ |
5823 | linux_read_memory, |
5824 | linux_write_memory, | |
2f2893d9 | 5825 | linux_look_up_symbols, |
ef57601b | 5826 | linux_request_interrupt, |
aa691b87 | 5827 | linux_read_auxv, |
d993e290 PA |
5828 | linux_insert_point, |
5829 | linux_remove_point, | |
e013ee27 OF |
5830 | linux_stopped_by_watchpoint, |
5831 | linux_stopped_data_address, | |
db0dfaa0 LM |
5832 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5833 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5834 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 5835 | linux_read_offsets, |
dae5f5cf DJ |
5836 | #else |
5837 | NULL, | |
5838 | #endif | |
5839 | #ifdef USE_THREAD_DB | |
5840 | thread_db_get_tls_address, | |
5841 | #else | |
5842 | NULL, | |
52fb6437 | 5843 | #endif |
efcbbd14 | 5844 | linux_qxfer_spu, |
59a016f0 | 5845 | hostio_last_error_from_errno, |
07e059b5 | 5846 | linux_qxfer_osdata, |
4aa995e1 | 5847 | linux_xfer_siginfo, |
bd99dc85 PA |
5848 | linux_supports_non_stop, |
5849 | linux_async, | |
5850 | linux_start_non_stop, | |
cdbfd419 PP |
5851 | linux_supports_multi_process, |
5852 | #ifdef USE_THREAD_DB | |
dc146f7c | 5853 | thread_db_handle_monitor_command, |
cdbfd419 | 5854 | #else |
dc146f7c | 5855 | NULL, |
cdbfd419 | 5856 | #endif |
d26e3629 | 5857 | linux_common_core_of_thread, |
78d85199 | 5858 | linux_read_loadmap, |
219f2f23 PA |
5859 | linux_process_qsupported, |
5860 | linux_supports_tracepoints, | |
5861 | linux_read_pc, | |
8336d594 PA |
5862 | linux_write_pc, |
5863 | linux_thread_stopped, | |
7984d532 | 5864 | NULL, |
711e434b | 5865 | linux_pause_all, |
7984d532 | 5866 | linux_unpause_all, |
fa593d66 PA |
5867 | linux_cancel_breakpoints, |
5868 | linux_stabilize_threads, | |
6a271cae | 5869 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5870 | linux_emit_ops, |
5871 | linux_supports_disable_randomization, | |
405f8e94 | 5872 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5873 | linux_qxfer_libraries_svr4, |
d1feda86 | 5874 | linux_supports_agent, |
9accd112 MM |
5875 | #ifdef HAVE_LINUX_BTRACE |
5876 | linux_supports_btrace, | |
5877 | linux_low_enable_btrace, | |
969c39fb | 5878 | linux_low_disable_btrace, |
9accd112 MM |
5879 | linux_low_read_btrace, |
5880 | #else | |
5881 | NULL, | |
5882 | NULL, | |
5883 | NULL, | |
5884 | NULL, | |
9accd112 | 5885 | #endif |
c2d6af84 | 5886 | linux_supports_range_stepping, |
ce3a066d DJ |
5887 | }; |
5888 | ||
0d62e5e8 DJ |
5889 | static void |
5890 | linux_init_signals () | |
5891 | { | |
5892 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5893 | to find what the cancel signal actually is. */ | |
1a981360 | 5894 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5895 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5896 | #endif |
0d62e5e8 DJ |
5897 | } |
5898 | ||
3aee8918 PA |
5899 | #ifdef HAVE_LINUX_REGSETS |
5900 | void | |
5901 | initialize_regsets_info (struct regsets_info *info) | |
5902 | { | |
5903 | for (info->num_regsets = 0; | |
5904 | info->regsets[info->num_regsets].size >= 0; | |
5905 | info->num_regsets++) | |
5906 | ; | |
3aee8918 PA |
5907 | } |
5908 | #endif | |
5909 | ||
da6d8c04 DJ |
5910 | void |
5911 | initialize_low (void) | |
5912 | { | |
bd99dc85 PA |
5913 | struct sigaction sigchld_action; |
5914 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5915 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5916 | set_breakpoint_data (the_low_target.breakpoint, |
5917 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5918 | linux_init_signals (); |
aa7c7447 | 5919 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
5920 | |
5921 | sigchld_action.sa_handler = sigchld_handler; | |
5922 | sigemptyset (&sigchld_action.sa_mask); | |
5923 | sigchld_action.sa_flags = SA_RESTART; | |
5924 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
5925 | |
5926 | initialize_low_arch (); | |
da6d8c04 | 5927 | } |