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da6d8c04 | 1 | /* Low level interface to ptrace, for the remote server for GDB. |
28e7fd62 | 2 | Copyright (C) 1995-2013 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> | |
8bdce1ff | 44 | #include "gdb_stat.h" |
efcbbd14 | 45 | #include <sys/vfs.h> |
1570b33e | 46 | #include <sys/uio.h> |
957f3f49 DE |
47 | #ifndef ELFMAG0 |
48 | /* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h | |
49 | then ELFMAG0 will have been defined. If it didn't get included by | |
50 | gdb_proc_service.h then including it will likely introduce a duplicate | |
51 | definition of elf_fpregset_t. */ | |
52 | #include <elf.h> | |
53 | #endif | |
efcbbd14 UW |
54 | |
55 | #ifndef SPUFS_MAGIC | |
56 | #define SPUFS_MAGIC 0x23c9b64e | |
57 | #endif | |
da6d8c04 | 58 | |
03583c20 UW |
59 | #ifdef HAVE_PERSONALITY |
60 | # include <sys/personality.h> | |
61 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
62 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
63 | # endif | |
64 | #endif | |
65 | ||
fd462a61 DJ |
66 | #ifndef O_LARGEFILE |
67 | #define O_LARGEFILE 0 | |
68 | #endif | |
69 | ||
ec8ebe72 DE |
70 | #ifndef W_STOPCODE |
71 | #define W_STOPCODE(sig) ((sig) << 8 | 0x7f) | |
72 | #endif | |
73 | ||
1a981360 PA |
74 | /* This is the kernel's hard limit. Not to be confused with |
75 | SIGRTMIN. */ | |
76 | #ifndef __SIGRTMIN | |
77 | #define __SIGRTMIN 32 | |
78 | #endif | |
79 | ||
db0dfaa0 LM |
80 | /* Some targets did not define these ptrace constants from the start, |
81 | so gdbserver defines them locally here. In the future, these may | |
82 | be removed after they are added to asm/ptrace.h. */ | |
83 | #if !(defined(PT_TEXT_ADDR) \ | |
84 | || defined(PT_DATA_ADDR) \ | |
85 | || defined(PT_TEXT_END_ADDR)) | |
86 | #if defined(__mcoldfire__) | |
87 | /* These are still undefined in 3.10 kernels. */ | |
88 | #define PT_TEXT_ADDR 49*4 | |
89 | #define PT_DATA_ADDR 50*4 | |
90 | #define PT_TEXT_END_ADDR 51*4 | |
91 | /* BFIN already defines these since at least 2.6.32 kernels. */ | |
92 | #elif defined(BFIN) | |
93 | #define PT_TEXT_ADDR 220 | |
94 | #define PT_TEXT_END_ADDR 224 | |
95 | #define PT_DATA_ADDR 228 | |
96 | /* These are still undefined in 3.10 kernels. */ | |
97 | #elif defined(__TMS320C6X__) | |
98 | #define PT_TEXT_ADDR (0x10000*4) | |
99 | #define PT_DATA_ADDR (0x10004*4) | |
100 | #define PT_TEXT_END_ADDR (0x10008*4) | |
101 | #endif | |
102 | #endif | |
103 | ||
9accd112 MM |
104 | #ifdef HAVE_LINUX_BTRACE |
105 | # include "linux-btrace.h" | |
106 | #endif | |
107 | ||
8365dcf5 TJB |
108 | #ifndef HAVE_ELF32_AUXV_T |
109 | /* Copied from glibc's elf.h. */ | |
110 | typedef struct | |
111 | { | |
112 | uint32_t a_type; /* Entry type */ | |
113 | union | |
114 | { | |
115 | uint32_t a_val; /* Integer value */ | |
116 | /* We use to have pointer elements added here. We cannot do that, | |
117 | though, since it does not work when using 32-bit definitions | |
118 | on 64-bit platforms and vice versa. */ | |
119 | } a_un; | |
120 | } Elf32_auxv_t; | |
121 | #endif | |
122 | ||
123 | #ifndef HAVE_ELF64_AUXV_T | |
124 | /* Copied from glibc's elf.h. */ | |
125 | typedef struct | |
126 | { | |
127 | uint64_t a_type; /* Entry type */ | |
128 | union | |
129 | { | |
130 | uint64_t a_val; /* Integer value */ | |
131 | /* We use to have pointer elements added here. We cannot do that, | |
132 | though, since it does not work when using 32-bit definitions | |
133 | on 64-bit platforms and vice versa. */ | |
134 | } a_un; | |
135 | } Elf64_auxv_t; | |
136 | #endif | |
137 | ||
24a09b5f DJ |
138 | /* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol |
139 | representation of the thread ID. | |
611cb4a5 | 140 | |
54a0b537 | 141 | ``all_lwps'' is keyed by the process ID - which on Linux is (presently) |
95954743 PA |
142 | the same as the LWP ID. |
143 | ||
144 | ``all_processes'' is keyed by the "overall process ID", which | |
145 | GNU/Linux calls tgid, "thread group ID". */ | |
0d62e5e8 | 146 | |
54a0b537 | 147 | struct inferior_list all_lwps; |
0d62e5e8 | 148 | |
05044653 PA |
149 | /* A list of all unknown processes which receive stop signals. Some |
150 | other process will presumably claim each of these as forked | |
151 | children momentarily. */ | |
24a09b5f | 152 | |
05044653 PA |
153 | struct simple_pid_list |
154 | { | |
155 | /* The process ID. */ | |
156 | int pid; | |
157 | ||
158 | /* The status as reported by waitpid. */ | |
159 | int status; | |
160 | ||
161 | /* Next in chain. */ | |
162 | struct simple_pid_list *next; | |
163 | }; | |
164 | struct simple_pid_list *stopped_pids; | |
165 | ||
166 | /* Trivial list manipulation functions to keep track of a list of new | |
167 | stopped processes. */ | |
168 | ||
169 | static void | |
170 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) | |
171 | { | |
172 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
173 | ||
174 | new_pid->pid = pid; | |
175 | new_pid->status = status; | |
176 | new_pid->next = *listp; | |
177 | *listp = new_pid; | |
178 | } | |
179 | ||
180 | static int | |
181 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) | |
182 | { | |
183 | struct simple_pid_list **p; | |
184 | ||
185 | for (p = listp; *p != NULL; p = &(*p)->next) | |
186 | if ((*p)->pid == pid) | |
187 | { | |
188 | struct simple_pid_list *next = (*p)->next; | |
189 | ||
190 | *statusp = (*p)->status; | |
191 | xfree (*p); | |
192 | *p = next; | |
193 | return 1; | |
194 | } | |
195 | return 0; | |
196 | } | |
24a09b5f | 197 | |
bde24c0a PA |
198 | enum stopping_threads_kind |
199 | { | |
200 | /* Not stopping threads presently. */ | |
201 | NOT_STOPPING_THREADS, | |
202 | ||
203 | /* Stopping threads. */ | |
204 | STOPPING_THREADS, | |
205 | ||
206 | /* Stopping and suspending threads. */ | |
207 | STOPPING_AND_SUSPENDING_THREADS | |
208 | }; | |
209 | ||
210 | /* This is set while stop_all_lwps is in effect. */ | |
211 | enum stopping_threads_kind stopping_threads = NOT_STOPPING_THREADS; | |
0d62e5e8 DJ |
212 | |
213 | /* FIXME make into a target method? */ | |
24a09b5f | 214 | int using_threads = 1; |
24a09b5f | 215 | |
fa593d66 PA |
216 | /* True if we're presently stabilizing threads (moving them out of |
217 | jump pads). */ | |
218 | static int stabilizing_threads; | |
219 | ||
2acc282a | 220 | static void linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 221 | int step, int signal, siginfo_t *info); |
2bd7c093 | 222 | static void linux_resume (struct thread_resume *resume_info, size_t n); |
7984d532 PA |
223 | static void stop_all_lwps (int suspend, struct lwp_info *except); |
224 | static void unstop_all_lwps (int unsuspend, struct lwp_info *except); | |
95954743 | 225 | static int linux_wait_for_event (ptid_t ptid, int *wstat, int options); |
95954743 | 226 | static void *add_lwp (ptid_t ptid); |
c35fafde | 227 | static int linux_stopped_by_watchpoint (void); |
95954743 | 228 | static void mark_lwp_dead (struct lwp_info *lwp, int wstat); |
d50171e4 | 229 | static void proceed_all_lwps (void); |
d50171e4 PA |
230 | static int finish_step_over (struct lwp_info *lwp); |
231 | static CORE_ADDR get_stop_pc (struct lwp_info *lwp); | |
232 | static int kill_lwp (unsigned long lwpid, int signo); | |
233 | ||
234 | /* True if the low target can hardware single-step. Such targets | |
235 | don't need a BREAKPOINT_REINSERT_ADDR callback. */ | |
236 | ||
237 | static int | |
238 | can_hardware_single_step (void) | |
239 | { | |
240 | return (the_low_target.breakpoint_reinsert_addr == NULL); | |
241 | } | |
242 | ||
243 | /* True if the low target supports memory breakpoints. If so, we'll | |
244 | have a GET_PC implementation. */ | |
245 | ||
246 | static int | |
247 | supports_breakpoints (void) | |
248 | { | |
249 | return (the_low_target.get_pc != NULL); | |
250 | } | |
0d62e5e8 | 251 | |
fa593d66 PA |
252 | /* Returns true if this target can support fast tracepoints. This |
253 | does not mean that the in-process agent has been loaded in the | |
254 | inferior. */ | |
255 | ||
256 | static int | |
257 | supports_fast_tracepoints (void) | |
258 | { | |
259 | return the_low_target.install_fast_tracepoint_jump_pad != NULL; | |
260 | } | |
261 | ||
c2d6af84 PA |
262 | /* True if LWP is stopped in its stepping range. */ |
263 | ||
264 | static int | |
265 | lwp_in_step_range (struct lwp_info *lwp) | |
266 | { | |
267 | CORE_ADDR pc = lwp->stop_pc; | |
268 | ||
269 | return (pc >= lwp->step_range_start && pc < lwp->step_range_end); | |
270 | } | |
271 | ||
0d62e5e8 DJ |
272 | struct pending_signals |
273 | { | |
274 | int signal; | |
32ca6d61 | 275 | siginfo_t info; |
0d62e5e8 DJ |
276 | struct pending_signals *prev; |
277 | }; | |
611cb4a5 | 278 | |
bd99dc85 PA |
279 | /* The read/write ends of the pipe registered as waitable file in the |
280 | event loop. */ | |
281 | static int linux_event_pipe[2] = { -1, -1 }; | |
282 | ||
283 | /* True if we're currently in async mode. */ | |
284 | #define target_is_async_p() (linux_event_pipe[0] != -1) | |
285 | ||
02fc4de7 | 286 | static void send_sigstop (struct lwp_info *lwp); |
bd99dc85 PA |
287 | static void wait_for_sigstop (struct inferior_list_entry *entry); |
288 | ||
d0722149 DE |
289 | /* Return non-zero if HEADER is a 64-bit ELF file. */ |
290 | ||
291 | static int | |
214d508e | 292 | elf_64_header_p (const Elf64_Ehdr *header, unsigned int *machine) |
d0722149 | 293 | { |
214d508e L |
294 | if (header->e_ident[EI_MAG0] == ELFMAG0 |
295 | && header->e_ident[EI_MAG1] == ELFMAG1 | |
296 | && header->e_ident[EI_MAG2] == ELFMAG2 | |
297 | && header->e_ident[EI_MAG3] == ELFMAG3) | |
298 | { | |
299 | *machine = header->e_machine; | |
300 | return header->e_ident[EI_CLASS] == ELFCLASS64; | |
301 | ||
302 | } | |
303 | *machine = EM_NONE; | |
304 | return -1; | |
d0722149 DE |
305 | } |
306 | ||
307 | /* Return non-zero if FILE is a 64-bit ELF file, | |
308 | zero if the file is not a 64-bit ELF file, | |
309 | and -1 if the file is not accessible or doesn't exist. */ | |
310 | ||
be07f1a2 | 311 | static int |
214d508e | 312 | elf_64_file_p (const char *file, unsigned int *machine) |
d0722149 | 313 | { |
957f3f49 | 314 | Elf64_Ehdr header; |
d0722149 DE |
315 | int fd; |
316 | ||
317 | fd = open (file, O_RDONLY); | |
318 | if (fd < 0) | |
319 | return -1; | |
320 | ||
321 | if (read (fd, &header, sizeof (header)) != sizeof (header)) | |
322 | { | |
323 | close (fd); | |
324 | return 0; | |
325 | } | |
326 | close (fd); | |
327 | ||
214d508e | 328 | return elf_64_header_p (&header, machine); |
d0722149 DE |
329 | } |
330 | ||
be07f1a2 PA |
331 | /* Accepts an integer PID; Returns true if the executable PID is |
332 | running is a 64-bit ELF file.. */ | |
333 | ||
334 | int | |
214d508e | 335 | linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine) |
be07f1a2 | 336 | { |
d8d2a3ee | 337 | char file[PATH_MAX]; |
be07f1a2 PA |
338 | |
339 | sprintf (file, "/proc/%d/exe", pid); | |
214d508e | 340 | return elf_64_file_p (file, machine); |
be07f1a2 PA |
341 | } |
342 | ||
bd99dc85 PA |
343 | static void |
344 | delete_lwp (struct lwp_info *lwp) | |
345 | { | |
346 | remove_thread (get_lwp_thread (lwp)); | |
347 | remove_inferior (&all_lwps, &lwp->head); | |
aa5ca48f | 348 | free (lwp->arch_private); |
bd99dc85 PA |
349 | free (lwp); |
350 | } | |
351 | ||
95954743 PA |
352 | /* Add a process to the common process list, and set its private |
353 | data. */ | |
354 | ||
355 | static struct process_info * | |
356 | linux_add_process (int pid, int attached) | |
357 | { | |
358 | struct process_info *proc; | |
359 | ||
95954743 PA |
360 | proc = add_process (pid, attached); |
361 | proc->private = xcalloc (1, sizeof (*proc->private)); | |
362 | ||
3aee8918 PA |
363 | /* Set the arch when the first LWP stops. */ |
364 | proc->private->new_inferior = 1; | |
365 | ||
aa5ca48f DE |
366 | if (the_low_target.new_process != NULL) |
367 | proc->private->arch_private = the_low_target.new_process (); | |
368 | ||
95954743 PA |
369 | return proc; |
370 | } | |
371 | ||
bd99dc85 PA |
372 | /* Handle a GNU/Linux extended wait response. If we see a clone |
373 | event, we need to add the new LWP to our list (and not report the | |
374 | trap to higher layers). */ | |
0d62e5e8 | 375 | |
24a09b5f | 376 | static void |
54a0b537 | 377 | handle_extended_wait (struct lwp_info *event_child, int wstat) |
24a09b5f DJ |
378 | { |
379 | int event = wstat >> 16; | |
54a0b537 | 380 | struct lwp_info *new_lwp; |
24a09b5f DJ |
381 | |
382 | if (event == PTRACE_EVENT_CLONE) | |
383 | { | |
95954743 | 384 | ptid_t ptid; |
24a09b5f | 385 | unsigned long new_pid; |
05044653 | 386 | int ret, status; |
24a09b5f | 387 | |
b8e1b30e | 388 | ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 389 | &new_pid); |
24a09b5f DJ |
390 | |
391 | /* If we haven't already seen the new PID stop, wait for it now. */ | |
05044653 | 392 | if (!pull_pid_from_list (&stopped_pids, new_pid, &status)) |
24a09b5f DJ |
393 | { |
394 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
395 | hits the SIGSTOP, but we're already attached. */ | |
396 | ||
97438e3f | 397 | ret = my_waitpid (new_pid, &status, __WALL); |
24a09b5f DJ |
398 | |
399 | if (ret == -1) | |
400 | perror_with_name ("waiting for new child"); | |
401 | else if (ret != new_pid) | |
402 | warning ("wait returned unexpected PID %d", ret); | |
da5898ce | 403 | else if (!WIFSTOPPED (status)) |
24a09b5f DJ |
404 | warning ("wait returned unexpected status 0x%x", status); |
405 | } | |
406 | ||
95954743 PA |
407 | ptid = ptid_build (pid_of (event_child), new_pid, 0); |
408 | new_lwp = (struct lwp_info *) add_lwp (ptid); | |
409 | add_thread (ptid, new_lwp); | |
24a09b5f | 410 | |
e27d73f6 DE |
411 | /* Either we're going to immediately resume the new thread |
412 | or leave it stopped. linux_resume_one_lwp is a nop if it | |
413 | thinks the thread is currently running, so set this first | |
414 | before calling linux_resume_one_lwp. */ | |
415 | new_lwp->stopped = 1; | |
416 | ||
bde24c0a PA |
417 | /* If we're suspending all threads, leave this one suspended |
418 | too. */ | |
419 | if (stopping_threads == STOPPING_AND_SUSPENDING_THREADS) | |
420 | new_lwp->suspended = 1; | |
421 | ||
da5898ce DJ |
422 | /* Normally we will get the pending SIGSTOP. But in some cases |
423 | we might get another signal delivered to the group first. | |
f21cc1a2 | 424 | If we do get another signal, be sure not to lose it. */ |
da5898ce DJ |
425 | if (WSTOPSIG (status) == SIGSTOP) |
426 | { | |
bde24c0a | 427 | if (stopping_threads != NOT_STOPPING_THREADS) |
d50171e4 PA |
428 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
429 | else | |
e27d73f6 | 430 | linux_resume_one_lwp (new_lwp, 0, 0, NULL); |
da5898ce | 431 | } |
24a09b5f | 432 | else |
da5898ce | 433 | { |
54a0b537 | 434 | new_lwp->stop_expected = 1; |
d50171e4 | 435 | |
bde24c0a | 436 | if (stopping_threads != NOT_STOPPING_THREADS) |
da5898ce | 437 | { |
d50171e4 | 438 | new_lwp->stop_pc = get_stop_pc (new_lwp); |
54a0b537 PA |
439 | new_lwp->status_pending_p = 1; |
440 | new_lwp->status_pending = status; | |
da5898ce DJ |
441 | } |
442 | else | |
443 | /* Pass the signal on. This is what GDB does - except | |
444 | shouldn't we really report it instead? */ | |
e27d73f6 | 445 | linux_resume_one_lwp (new_lwp, 0, WSTOPSIG (status), NULL); |
da5898ce | 446 | } |
24a09b5f DJ |
447 | |
448 | /* Always resume the current thread. If we are stopping | |
449 | threads, it will have a pending SIGSTOP; we may as well | |
450 | collect it now. */ | |
2acc282a | 451 | linux_resume_one_lwp (event_child, event_child->stepping, 0, NULL); |
24a09b5f DJ |
452 | } |
453 | } | |
454 | ||
d50171e4 PA |
455 | /* Return the PC as read from the regcache of LWP, without any |
456 | adjustment. */ | |
457 | ||
458 | static CORE_ADDR | |
459 | get_pc (struct lwp_info *lwp) | |
460 | { | |
461 | struct thread_info *saved_inferior; | |
462 | struct regcache *regcache; | |
463 | CORE_ADDR pc; | |
464 | ||
465 | if (the_low_target.get_pc == NULL) | |
466 | return 0; | |
467 | ||
468 | saved_inferior = current_inferior; | |
469 | current_inferior = get_lwp_thread (lwp); | |
470 | ||
471 | regcache = get_thread_regcache (current_inferior, 1); | |
472 | pc = (*the_low_target.get_pc) (regcache); | |
473 | ||
474 | if (debug_threads) | |
475 | fprintf (stderr, "pc is 0x%lx\n", (long) pc); | |
476 | ||
477 | current_inferior = saved_inferior; | |
478 | return pc; | |
479 | } | |
480 | ||
481 | /* This function should only be called if LWP got a SIGTRAP. | |
0d62e5e8 DJ |
482 | The SIGTRAP could mean several things. |
483 | ||
484 | On i386, where decr_pc_after_break is non-zero: | |
485 | If we were single-stepping this process using PTRACE_SINGLESTEP, | |
486 | we will get only the one SIGTRAP (even if the instruction we | |
487 | stepped over was a breakpoint). The value of $eip will be the | |
488 | next instruction. | |
489 | If we continue the process using PTRACE_CONT, we will get a | |
490 | SIGTRAP when we hit a breakpoint. The value of $eip will be | |
491 | the instruction after the breakpoint (i.e. needs to be | |
492 | decremented). If we report the SIGTRAP to GDB, we must also | |
493 | report the undecremented PC. If we cancel the SIGTRAP, we | |
494 | must resume at the decremented PC. | |
495 | ||
496 | (Presumably, not yet tested) On a non-decr_pc_after_break machine | |
497 | with hardware or kernel single-step: | |
498 | If we single-step over a breakpoint instruction, our PC will | |
499 | point at the following instruction. If we continue and hit a | |
500 | breakpoint instruction, our PC will point at the breakpoint | |
501 | instruction. */ | |
502 | ||
503 | static CORE_ADDR | |
d50171e4 | 504 | get_stop_pc (struct lwp_info *lwp) |
0d62e5e8 | 505 | { |
d50171e4 PA |
506 | CORE_ADDR stop_pc; |
507 | ||
508 | if (the_low_target.get_pc == NULL) | |
509 | return 0; | |
0d62e5e8 | 510 | |
d50171e4 PA |
511 | stop_pc = get_pc (lwp); |
512 | ||
bdabb078 PA |
513 | if (WSTOPSIG (lwp->last_status) == SIGTRAP |
514 | && !lwp->stepping | |
515 | && !lwp->stopped_by_watchpoint | |
516 | && lwp->last_status >> 16 == 0) | |
47c0c975 DE |
517 | stop_pc -= the_low_target.decr_pc_after_break; |
518 | ||
519 | if (debug_threads) | |
520 | fprintf (stderr, "stop pc is 0x%lx\n", (long) stop_pc); | |
521 | ||
522 | return stop_pc; | |
0d62e5e8 | 523 | } |
ce3a066d | 524 | |
0d62e5e8 | 525 | static void * |
95954743 | 526 | add_lwp (ptid_t ptid) |
611cb4a5 | 527 | { |
54a0b537 | 528 | struct lwp_info *lwp; |
0d62e5e8 | 529 | |
54a0b537 PA |
530 | lwp = (struct lwp_info *) xmalloc (sizeof (*lwp)); |
531 | memset (lwp, 0, sizeof (*lwp)); | |
0d62e5e8 | 532 | |
95954743 | 533 | lwp->head.id = ptid; |
0d62e5e8 | 534 | |
aa5ca48f DE |
535 | if (the_low_target.new_thread != NULL) |
536 | lwp->arch_private = the_low_target.new_thread (); | |
537 | ||
54a0b537 | 538 | add_inferior_to_list (&all_lwps, &lwp->head); |
0d62e5e8 | 539 | |
54a0b537 | 540 | return lwp; |
0d62e5e8 | 541 | } |
611cb4a5 | 542 | |
da6d8c04 DJ |
543 | /* Start an inferior process and returns its pid. |
544 | ALLARGS is a vector of program-name and args. */ | |
545 | ||
ce3a066d DJ |
546 | static int |
547 | linux_create_inferior (char *program, char **allargs) | |
da6d8c04 | 548 | { |
03583c20 UW |
549 | #ifdef HAVE_PERSONALITY |
550 | int personality_orig = 0, personality_set = 0; | |
551 | #endif | |
a6dbe5df | 552 | struct lwp_info *new_lwp; |
da6d8c04 | 553 | int pid; |
95954743 | 554 | ptid_t ptid; |
da6d8c04 | 555 | |
03583c20 UW |
556 | #ifdef HAVE_PERSONALITY |
557 | if (disable_randomization) | |
558 | { | |
559 | errno = 0; | |
560 | personality_orig = personality (0xffffffff); | |
561 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
562 | { | |
563 | personality_set = 1; | |
564 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
565 | } | |
566 | if (errno != 0 || (personality_set | |
567 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
568 | warning ("Error disabling address space randomization: %s", | |
569 | strerror (errno)); | |
570 | } | |
571 | #endif | |
572 | ||
42c81e2a | 573 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) |
52fb6437 NS |
574 | pid = vfork (); |
575 | #else | |
da6d8c04 | 576 | pid = fork (); |
52fb6437 | 577 | #endif |
da6d8c04 DJ |
578 | if (pid < 0) |
579 | perror_with_name ("fork"); | |
580 | ||
581 | if (pid == 0) | |
582 | { | |
b8e1b30e | 583 | ptrace (PTRACE_TRACEME, 0, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da6d8c04 | 584 | |
1a981360 | 585 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 586 | signal (__SIGRTMIN + 1, SIG_DFL); |
60c3d7b0 | 587 | #endif |
0d62e5e8 | 588 | |
a9fa9f7d DJ |
589 | setpgid (0, 0); |
590 | ||
e0f9f062 DE |
591 | /* If gdbserver is connected to gdb via stdio, redirect the inferior's |
592 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
593 | Also, redirect stdin to /dev/null. */ | |
594 | if (remote_connection_is_stdio ()) | |
595 | { | |
596 | close (0); | |
597 | open ("/dev/null", O_RDONLY); | |
598 | dup2 (2, 1); | |
3e52c33d JK |
599 | if (write (2, "stdin/stdout redirected\n", |
600 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
8c29b58e YQ |
601 | { |
602 | /* Errors ignored. */; | |
603 | } | |
e0f9f062 DE |
604 | } |
605 | ||
2b876972 DJ |
606 | execv (program, allargs); |
607 | if (errno == ENOENT) | |
608 | execvp (program, allargs); | |
da6d8c04 DJ |
609 | |
610 | fprintf (stderr, "Cannot exec %s: %s.\n", program, | |
d07c63e7 | 611 | strerror (errno)); |
da6d8c04 DJ |
612 | fflush (stderr); |
613 | _exit (0177); | |
614 | } | |
615 | ||
03583c20 UW |
616 | #ifdef HAVE_PERSONALITY |
617 | if (personality_set) | |
618 | { | |
619 | errno = 0; | |
620 | personality (personality_orig); | |
621 | if (errno != 0) | |
622 | warning ("Error restoring address space randomization: %s", | |
623 | strerror (errno)); | |
624 | } | |
625 | #endif | |
626 | ||
95954743 PA |
627 | linux_add_process (pid, 0); |
628 | ||
629 | ptid = ptid_build (pid, pid, 0); | |
630 | new_lwp = add_lwp (ptid); | |
631 | add_thread (ptid, new_lwp); | |
a6dbe5df | 632 | new_lwp->must_set_ptrace_flags = 1; |
611cb4a5 | 633 | |
a9fa9f7d | 634 | return pid; |
da6d8c04 DJ |
635 | } |
636 | ||
637 | /* Attach to an inferior process. */ | |
638 | ||
95954743 PA |
639 | static void |
640 | linux_attach_lwp_1 (unsigned long lwpid, int initial) | |
da6d8c04 | 641 | { |
95954743 | 642 | ptid_t ptid; |
54a0b537 | 643 | struct lwp_info *new_lwp; |
611cb4a5 | 644 | |
b8e1b30e | 645 | if (ptrace (PTRACE_ATTACH, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0) |
56f7af9c | 646 | != 0) |
da6d8c04 | 647 | { |
87b0bb13 JK |
648 | struct buffer buffer; |
649 | ||
95954743 | 650 | if (!initial) |
2d717e4f DJ |
651 | { |
652 | /* If we fail to attach to an LWP, just warn. */ | |
95954743 | 653 | fprintf (stderr, "Cannot attach to lwp %ld: %s (%d)\n", lwpid, |
2d717e4f DJ |
654 | strerror (errno), errno); |
655 | fflush (stderr); | |
656 | return; | |
657 | } | |
5f572dec JK |
658 | |
659 | /* If we fail to attach to a process, report an error. */ | |
87b0bb13 JK |
660 | buffer_init (&buffer); |
661 | linux_ptrace_attach_warnings (lwpid, &buffer); | |
662 | buffer_grow_str0 (&buffer, ""); | |
663 | error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer), | |
664 | lwpid, strerror (errno), errno); | |
da6d8c04 DJ |
665 | } |
666 | ||
95954743 | 667 | if (initial) |
e3deef73 LM |
668 | /* If lwp is the tgid, we handle adding existing threads later. |
669 | Otherwise we just add lwp without bothering about any other | |
670 | threads. */ | |
95954743 PA |
671 | ptid = ptid_build (lwpid, lwpid, 0); |
672 | else | |
673 | { | |
674 | /* Note that extracting the pid from the current inferior is | |
675 | safe, since we're always called in the context of the same | |
676 | process as this new thread. */ | |
677 | int pid = pid_of (get_thread_lwp (current_inferior)); | |
678 | ptid = ptid_build (pid, lwpid, 0); | |
679 | } | |
24a09b5f | 680 | |
95954743 PA |
681 | new_lwp = (struct lwp_info *) add_lwp (ptid); |
682 | add_thread (ptid, new_lwp); | |
0d62e5e8 | 683 | |
a6dbe5df PA |
684 | /* We need to wait for SIGSTOP before being able to make the next |
685 | ptrace call on this LWP. */ | |
686 | new_lwp->must_set_ptrace_flags = 1; | |
687 | ||
644cebc9 | 688 | if (linux_proc_pid_is_stopped (lwpid)) |
c14d7ab2 PA |
689 | { |
690 | if (debug_threads) | |
691 | fprintf (stderr, | |
692 | "Attached to a stopped process\n"); | |
693 | ||
694 | /* The process is definitely stopped. It is in a job control | |
695 | stop, unless the kernel predates the TASK_STOPPED / | |
696 | TASK_TRACED distinction, in which case it might be in a | |
697 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
698 | can kill it, signal it, et cetera. | |
699 | ||
700 | First make sure there is a pending SIGSTOP. Since we are | |
701 | already attached, the process can not transition from stopped | |
702 | to running without a PTRACE_CONT; so we know this signal will | |
703 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
704 | probably already in the queue (unless this kernel is old | |
705 | enough to use TASK_STOPPED for ptrace stops); but since | |
706 | SIGSTOP is not an RT signal, it can only be queued once. */ | |
707 | kill_lwp (lwpid, SIGSTOP); | |
708 | ||
709 | /* Finally, resume the stopped process. This will deliver the | |
710 | SIGSTOP (or a higher priority signal, just like normal | |
711 | PTRACE_ATTACH), which we'll catch later on. */ | |
b8e1b30e | 712 | ptrace (PTRACE_CONT, lwpid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
c14d7ab2 PA |
713 | } |
714 | ||
0d62e5e8 | 715 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH |
0e21c1ec DE |
716 | brings it to a halt. |
717 | ||
718 | There are several cases to consider here: | |
719 | ||
720 | 1) gdbserver has already attached to the process and is being notified | |
1b3f6016 | 721 | of a new thread that is being created. |
d50171e4 PA |
722 | In this case we should ignore that SIGSTOP and resume the |
723 | process. This is handled below by setting stop_expected = 1, | |
8336d594 | 724 | and the fact that add_thread sets last_resume_kind == |
d50171e4 | 725 | resume_continue. |
0e21c1ec DE |
726 | |
727 | 2) This is the first thread (the process thread), and we're attaching | |
1b3f6016 PA |
728 | to it via attach_inferior. |
729 | In this case we want the process thread to stop. | |
d50171e4 PA |
730 | This is handled by having linux_attach set last_resume_kind == |
731 | resume_stop after we return. | |
e3deef73 LM |
732 | |
733 | If the pid we are attaching to is also the tgid, we attach to and | |
734 | stop all the existing threads. Otherwise, we attach to pid and | |
735 | ignore any other threads in the same group as this pid. | |
0e21c1ec DE |
736 | |
737 | 3) GDB is connecting to gdbserver and is requesting an enumeration of all | |
1b3f6016 PA |
738 | existing threads. |
739 | In this case we want the thread to stop. | |
740 | FIXME: This case is currently not properly handled. | |
741 | We should wait for the SIGSTOP but don't. Things work apparently | |
742 | because enough time passes between when we ptrace (ATTACH) and when | |
743 | gdb makes the next ptrace call on the thread. | |
0d62e5e8 DJ |
744 | |
745 | On the other hand, if we are currently trying to stop all threads, we | |
746 | should treat the new thread as if we had sent it a SIGSTOP. This works | |
54a0b537 | 747 | because we are guaranteed that the add_lwp call above added us to the |
0e21c1ec DE |
748 | end of the list, and so the new thread has not yet reached |
749 | wait_for_sigstop (but will). */ | |
d50171e4 | 750 | new_lwp->stop_expected = 1; |
0d62e5e8 DJ |
751 | } |
752 | ||
95954743 PA |
753 | void |
754 | linux_attach_lwp (unsigned long lwpid) | |
755 | { | |
756 | linux_attach_lwp_1 (lwpid, 0); | |
757 | } | |
758 | ||
e3deef73 LM |
759 | /* Attach to PID. If PID is the tgid, attach to it and all |
760 | of its threads. */ | |
761 | ||
c52daf70 | 762 | static int |
a1928bad | 763 | linux_attach (unsigned long pid) |
0d62e5e8 | 764 | { |
e3deef73 LM |
765 | /* Attach to PID. We will check for other threads |
766 | soon. */ | |
95954743 | 767 | linux_attach_lwp_1 (pid, 1); |
95954743 | 768 | linux_add_process (pid, 1); |
0d62e5e8 | 769 | |
bd99dc85 PA |
770 | if (!non_stop) |
771 | { | |
8336d594 PA |
772 | struct thread_info *thread; |
773 | ||
774 | /* Don't ignore the initial SIGSTOP if we just attached to this | |
775 | process. It will be collected by wait shortly. */ | |
776 | thread = find_thread_ptid (ptid_build (pid, pid, 0)); | |
777 | thread->last_resume_kind = resume_stop; | |
bd99dc85 | 778 | } |
0d62e5e8 | 779 | |
e3deef73 LM |
780 | if (linux_proc_get_tgid (pid) == pid) |
781 | { | |
782 | DIR *dir; | |
783 | char pathname[128]; | |
784 | ||
785 | sprintf (pathname, "/proc/%ld/task", pid); | |
786 | ||
787 | dir = opendir (pathname); | |
788 | ||
789 | if (!dir) | |
790 | { | |
791 | fprintf (stderr, "Could not open /proc/%ld/task.\n", pid); | |
792 | fflush (stderr); | |
793 | } | |
794 | else | |
795 | { | |
796 | /* At this point we attached to the tgid. Scan the task for | |
797 | existing threads. */ | |
798 | unsigned long lwp; | |
799 | int new_threads_found; | |
800 | int iterations = 0; | |
801 | struct dirent *dp; | |
802 | ||
803 | while (iterations < 2) | |
804 | { | |
805 | new_threads_found = 0; | |
806 | /* Add all the other threads. While we go through the | |
807 | threads, new threads may be spawned. Cycle through | |
808 | the list of threads until we have done two iterations without | |
809 | finding new threads. */ | |
810 | while ((dp = readdir (dir)) != NULL) | |
811 | { | |
812 | /* Fetch one lwp. */ | |
813 | lwp = strtoul (dp->d_name, NULL, 10); | |
814 | ||
815 | /* Is this a new thread? */ | |
816 | if (lwp | |
817 | && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL) | |
818 | { | |
819 | linux_attach_lwp_1 (lwp, 0); | |
820 | new_threads_found++; | |
821 | ||
822 | if (debug_threads) | |
823 | fprintf (stderr, "\ | |
824 | Found and attached to new lwp %ld\n", lwp); | |
825 | } | |
826 | } | |
827 | ||
828 | if (!new_threads_found) | |
829 | iterations++; | |
830 | else | |
831 | iterations = 0; | |
832 | ||
833 | rewinddir (dir); | |
834 | } | |
835 | closedir (dir); | |
836 | } | |
837 | } | |
838 | ||
95954743 PA |
839 | return 0; |
840 | } | |
841 | ||
842 | struct counter | |
843 | { | |
844 | int pid; | |
845 | int count; | |
846 | }; | |
847 | ||
848 | static int | |
849 | second_thread_of_pid_p (struct inferior_list_entry *entry, void *args) | |
850 | { | |
851 | struct counter *counter = args; | |
852 | ||
853 | if (ptid_get_pid (entry->id) == counter->pid) | |
854 | { | |
855 | if (++counter->count > 1) | |
856 | return 1; | |
857 | } | |
d61ddec4 | 858 | |
da6d8c04 DJ |
859 | return 0; |
860 | } | |
861 | ||
95954743 PA |
862 | static int |
863 | last_thread_of_process_p (struct thread_info *thread) | |
864 | { | |
865 | ptid_t ptid = ((struct inferior_list_entry *)thread)->id; | |
866 | int pid = ptid_get_pid (ptid); | |
867 | struct counter counter = { pid , 0 }; | |
da6d8c04 | 868 | |
95954743 PA |
869 | return (find_inferior (&all_threads, |
870 | second_thread_of_pid_p, &counter) == NULL); | |
871 | } | |
872 | ||
da84f473 PA |
873 | /* Kill LWP. */ |
874 | ||
875 | static void | |
876 | linux_kill_one_lwp (struct lwp_info *lwp) | |
877 | { | |
878 | int pid = lwpid_of (lwp); | |
879 | ||
880 | /* PTRACE_KILL is unreliable. After stepping into a signal handler, | |
881 | there is no signal context, and ptrace(PTRACE_KILL) (or | |
882 | ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like | |
883 | ptrace(CONT, pid, 0,0) and just resumes the tracee. A better | |
884 | alternative is to kill with SIGKILL. We only need one SIGKILL | |
885 | per process, not one for each thread. But since we still support | |
886 | linuxthreads, and we also support debugging programs using raw | |
887 | clone without CLONE_THREAD, we send one for each thread. For | |
888 | years, we used PTRACE_KILL only, so we're being a bit paranoid | |
889 | about some old kernels where PTRACE_KILL might work better | |
890 | (dubious if there are any such, but that's why it's paranoia), so | |
891 | we try SIGKILL first, PTRACE_KILL second, and so we're fine | |
892 | everywhere. */ | |
893 | ||
894 | errno = 0; | |
895 | kill (pid, SIGKILL); | |
896 | if (debug_threads) | |
897 | fprintf (stderr, | |
898 | "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
899 | target_pid_to_str (ptid_of (lwp)), | |
900 | errno ? strerror (errno) : "OK"); | |
901 | ||
902 | errno = 0; | |
b8e1b30e | 903 | ptrace (PTRACE_KILL, pid, (PTRACE_TYPE_ARG3) 0, (PTRACE_TYPE_ARG4) 0); |
da84f473 PA |
904 | if (debug_threads) |
905 | fprintf (stderr, | |
906 | "LKL: PTRACE_KILL %s, 0, 0 (%s)\n", | |
907 | target_pid_to_str (ptid_of (lwp)), | |
908 | errno ? strerror (errno) : "OK"); | |
909 | } | |
910 | ||
911 | /* Callback for `find_inferior'. Kills an lwp of a given process, | |
912 | except the leader. */ | |
95954743 PA |
913 | |
914 | static int | |
da84f473 | 915 | kill_one_lwp_callback (struct inferior_list_entry *entry, void *args) |
da6d8c04 | 916 | { |
0d62e5e8 | 917 | struct thread_info *thread = (struct thread_info *) entry; |
54a0b537 | 918 | struct lwp_info *lwp = get_thread_lwp (thread); |
0d62e5e8 | 919 | int wstat; |
95954743 PA |
920 | int pid = * (int *) args; |
921 | ||
922 | if (ptid_get_pid (entry->id) != pid) | |
923 | return 0; | |
0d62e5e8 | 924 | |
fd500816 DJ |
925 | /* We avoid killing the first thread here, because of a Linux kernel (at |
926 | least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before | |
927 | the children get a chance to be reaped, it will remain a zombie | |
928 | forever. */ | |
95954743 | 929 | |
12b42a12 | 930 | if (lwpid_of (lwp) == pid) |
95954743 PA |
931 | { |
932 | if (debug_threads) | |
933 | fprintf (stderr, "lkop: is last of process %s\n", | |
934 | target_pid_to_str (entry->id)); | |
935 | return 0; | |
936 | } | |
fd500816 | 937 | |
0d62e5e8 DJ |
938 | do |
939 | { | |
da84f473 | 940 | linux_kill_one_lwp (lwp); |
0d62e5e8 DJ |
941 | |
942 | /* Make sure it died. The loop is most likely unnecessary. */ | |
95954743 | 943 | pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); |
bd99dc85 | 944 | } while (pid > 0 && WIFSTOPPED (wstat)); |
95954743 PA |
945 | |
946 | return 0; | |
da6d8c04 DJ |
947 | } |
948 | ||
95954743 PA |
949 | static int |
950 | linux_kill (int pid) | |
0d62e5e8 | 951 | { |
95954743 | 952 | struct process_info *process; |
54a0b537 | 953 | struct lwp_info *lwp; |
fd500816 | 954 | int wstat; |
95954743 | 955 | int lwpid; |
fd500816 | 956 | |
95954743 PA |
957 | process = find_process_pid (pid); |
958 | if (process == NULL) | |
959 | return -1; | |
9d606399 | 960 | |
f9e39928 PA |
961 | /* If we're killing a running inferior, make sure it is stopped |
962 | first, as PTRACE_KILL will not work otherwise. */ | |
7984d532 | 963 | stop_all_lwps (0, NULL); |
f9e39928 | 964 | |
da84f473 | 965 | find_inferior (&all_threads, kill_one_lwp_callback , &pid); |
fd500816 | 966 | |
54a0b537 | 967 | /* See the comment in linux_kill_one_lwp. We did not kill the first |
fd500816 | 968 | thread in the list, so do so now. */ |
95954743 | 969 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
bd99dc85 | 970 | |
784867a5 | 971 | if (lwp == NULL) |
fd500816 | 972 | { |
784867a5 JK |
973 | if (debug_threads) |
974 | fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n", | |
975 | lwpid_of (lwp), pid); | |
976 | } | |
977 | else | |
978 | { | |
979 | if (debug_threads) | |
980 | fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n", | |
981 | lwpid_of (lwp), pid); | |
fd500816 | 982 | |
784867a5 JK |
983 | do |
984 | { | |
da84f473 | 985 | linux_kill_one_lwp (lwp); |
784867a5 JK |
986 | |
987 | /* Make sure it died. The loop is most likely unnecessary. */ | |
988 | lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL); | |
989 | } while (lwpid > 0 && WIFSTOPPED (wstat)); | |
990 | } | |
2d717e4f | 991 | |
8336d594 | 992 | the_target->mourn (process); |
f9e39928 PA |
993 | |
994 | /* Since we presently can only stop all lwps of all processes, we | |
995 | need to unstop lwps of other processes. */ | |
7984d532 | 996 | unstop_all_lwps (0, NULL); |
95954743 | 997 | return 0; |
0d62e5e8 DJ |
998 | } |
999 | ||
9b224c5e PA |
1000 | /* Get pending signal of THREAD, for detaching purposes. This is the |
1001 | signal the thread last stopped for, which we need to deliver to the | |
1002 | thread when detaching, otherwise, it'd be suppressed/lost. */ | |
1003 | ||
1004 | static int | |
1005 | get_detach_signal (struct thread_info *thread) | |
1006 | { | |
a493e3e2 | 1007 | enum gdb_signal signo = GDB_SIGNAL_0; |
9b224c5e PA |
1008 | int status; |
1009 | struct lwp_info *lp = get_thread_lwp (thread); | |
1010 | ||
1011 | if (lp->status_pending_p) | |
1012 | status = lp->status_pending; | |
1013 | else | |
1014 | { | |
1015 | /* If the thread had been suspended by gdbserver, and it stopped | |
1016 | cleanly, then it'll have stopped with SIGSTOP. But we don't | |
1017 | want to deliver that SIGSTOP. */ | |
1018 | if (thread->last_status.kind != TARGET_WAITKIND_STOPPED | |
a493e3e2 | 1019 | || thread->last_status.value.sig == GDB_SIGNAL_0) |
9b224c5e PA |
1020 | return 0; |
1021 | ||
1022 | /* Otherwise, we may need to deliver the signal we | |
1023 | intercepted. */ | |
1024 | status = lp->last_status; | |
1025 | } | |
1026 | ||
1027 | if (!WIFSTOPPED (status)) | |
1028 | { | |
1029 | if (debug_threads) | |
1030 | fprintf (stderr, | |
1031 | "GPS: lwp %s hasn't stopped: no pending signal\n", | |
1032 | target_pid_to_str (ptid_of (lp))); | |
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) | |
1040 | fprintf (stderr, | |
1041 | "GPS: lwp %s had stopped with extended " | |
1042 | "status: no pending signal\n", | |
1043 | target_pid_to_str (ptid_of (lp))); | |
1044 | return 0; | |
1045 | } | |
1046 | ||
2ea28649 | 1047 | signo = gdb_signal_from_host (WSTOPSIG (status)); |
9b224c5e PA |
1048 | |
1049 | if (program_signals_p && !program_signals[signo]) | |
1050 | { | |
1051 | if (debug_threads) | |
1052 | fprintf (stderr, | |
1053 | "GPS: lwp %s had signal %s, but it is in nopass state\n", | |
1054 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1055 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1056 | return 0; |
1057 | } | |
1058 | else if (!program_signals_p | |
1059 | /* If we have no way to know which signals GDB does not | |
1060 | want to have passed to the program, assume | |
1061 | SIGTRAP/SIGINT, which is GDB's default. */ | |
a493e3e2 | 1062 | && (signo == GDB_SIGNAL_TRAP || signo == GDB_SIGNAL_INT)) |
9b224c5e PA |
1063 | { |
1064 | if (debug_threads) | |
1065 | fprintf (stderr, | |
1066 | "GPS: lwp %s had signal %s, " | |
1067 | "but we don't know if we should pass it. Default to not.\n", | |
1068 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1069 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1070 | return 0; |
1071 | } | |
1072 | else | |
1073 | { | |
1074 | if (debug_threads) | |
1075 | fprintf (stderr, | |
1076 | "GPS: lwp %s has pending signal %s: delivering it.\n", | |
1077 | target_pid_to_str (ptid_of (lp)), | |
2ea28649 | 1078 | gdb_signal_to_string (signo)); |
9b224c5e PA |
1079 | |
1080 | return WSTOPSIG (status); | |
1081 | } | |
1082 | } | |
1083 | ||
95954743 PA |
1084 | static int |
1085 | linux_detach_one_lwp (struct inferior_list_entry *entry, void *args) | |
6ad8ae5c DJ |
1086 | { |
1087 | struct thread_info *thread = (struct thread_info *) entry; | |
54a0b537 | 1088 | struct lwp_info *lwp = get_thread_lwp (thread); |
95954743 | 1089 | int pid = * (int *) args; |
9b224c5e | 1090 | int sig; |
95954743 PA |
1091 | |
1092 | if (ptid_get_pid (entry->id) != pid) | |
1093 | return 0; | |
6ad8ae5c | 1094 | |
9b224c5e | 1095 | /* If there is a pending SIGSTOP, get rid of it. */ |
54a0b537 | 1096 | if (lwp->stop_expected) |
ae13219e | 1097 | { |
9b224c5e PA |
1098 | if (debug_threads) |
1099 | fprintf (stderr, | |
1100 | "Sending SIGCONT to %s\n", | |
1101 | target_pid_to_str (ptid_of (lwp))); | |
1102 | ||
1103 | kill_lwp (lwpid_of (lwp), SIGCONT); | |
54a0b537 | 1104 | lwp->stop_expected = 0; |
ae13219e DJ |
1105 | } |
1106 | ||
1107 | /* Flush any pending changes to the process's registers. */ | |
3aee8918 | 1108 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
ae13219e | 1109 | |
9b224c5e PA |
1110 | /* Pass on any pending signal for this thread. */ |
1111 | sig = get_detach_signal (thread); | |
1112 | ||
ae13219e | 1113 | /* Finally, let it resume. */ |
82bfbe7e PA |
1114 | if (the_low_target.prepare_to_resume != NULL) |
1115 | the_low_target.prepare_to_resume (lwp); | |
b8e1b30e LM |
1116 | if (ptrace (PTRACE_DETACH, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
1117 | (PTRACE_TYPE_ARG4) (long) sig) < 0) | |
9b224c5e PA |
1118 | error (_("Can't detach %s: %s"), |
1119 | target_pid_to_str (ptid_of (lwp)), | |
1120 | strerror (errno)); | |
bd99dc85 PA |
1121 | |
1122 | delete_lwp (lwp); | |
95954743 | 1123 | return 0; |
6ad8ae5c DJ |
1124 | } |
1125 | ||
95954743 PA |
1126 | static int |
1127 | linux_detach (int pid) | |
1128 | { | |
1129 | struct process_info *process; | |
1130 | ||
1131 | process = find_process_pid (pid); | |
1132 | if (process == NULL) | |
1133 | return -1; | |
1134 | ||
f9e39928 PA |
1135 | /* Stop all threads before detaching. First, ptrace requires that |
1136 | the thread is stopped to sucessfully detach. Second, thread_db | |
1137 | may need to uninstall thread event breakpoints from memory, which | |
1138 | only works with a stopped process anyway. */ | |
7984d532 | 1139 | stop_all_lwps (0, NULL); |
f9e39928 | 1140 | |
ca5c370d | 1141 | #ifdef USE_THREAD_DB |
8336d594 | 1142 | thread_db_detach (process); |
ca5c370d PA |
1143 | #endif |
1144 | ||
fa593d66 PA |
1145 | /* Stabilize threads (move out of jump pads). */ |
1146 | stabilize_threads (); | |
1147 | ||
95954743 | 1148 | find_inferior (&all_threads, linux_detach_one_lwp, &pid); |
8336d594 PA |
1149 | |
1150 | the_target->mourn (process); | |
f9e39928 PA |
1151 | |
1152 | /* Since we presently can only stop all lwps of all processes, we | |
1153 | need to unstop lwps of other processes. */ | |
7984d532 | 1154 | unstop_all_lwps (0, NULL); |
f9e39928 PA |
1155 | return 0; |
1156 | } | |
1157 | ||
1158 | /* Remove all LWPs that belong to process PROC from the lwp list. */ | |
1159 | ||
1160 | static int | |
1161 | delete_lwp_callback (struct inferior_list_entry *entry, void *proc) | |
1162 | { | |
1163 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
1164 | struct process_info *process = proc; | |
1165 | ||
1166 | if (pid_of (lwp) == pid_of (process)) | |
1167 | delete_lwp (lwp); | |
1168 | ||
dd6953e1 | 1169 | return 0; |
6ad8ae5c DJ |
1170 | } |
1171 | ||
8336d594 PA |
1172 | static void |
1173 | linux_mourn (struct process_info *process) | |
1174 | { | |
1175 | struct process_info_private *priv; | |
1176 | ||
1177 | #ifdef USE_THREAD_DB | |
1178 | thread_db_mourn (process); | |
1179 | #endif | |
1180 | ||
f9e39928 PA |
1181 | find_inferior (&all_lwps, delete_lwp_callback, process); |
1182 | ||
8336d594 PA |
1183 | /* Freeing all private data. */ |
1184 | priv = process->private; | |
1185 | free (priv->arch_private); | |
1186 | free (priv); | |
1187 | process->private = NULL; | |
505106cd PA |
1188 | |
1189 | remove_process (process); | |
8336d594 PA |
1190 | } |
1191 | ||
444d6139 | 1192 | static void |
95954743 | 1193 | linux_join (int pid) |
444d6139 | 1194 | { |
444d6139 PA |
1195 | int status, ret; |
1196 | ||
1197 | do { | |
95954743 | 1198 | ret = my_waitpid (pid, &status, 0); |
444d6139 PA |
1199 | if (WIFEXITED (status) || WIFSIGNALED (status)) |
1200 | break; | |
1201 | } while (ret != -1 || errno != ECHILD); | |
1202 | } | |
1203 | ||
6ad8ae5c | 1204 | /* Return nonzero if the given thread is still alive. */ |
0d62e5e8 | 1205 | static int |
95954743 | 1206 | linux_thread_alive (ptid_t ptid) |
0d62e5e8 | 1207 | { |
95954743 PA |
1208 | struct lwp_info *lwp = find_lwp_pid (ptid); |
1209 | ||
1210 | /* We assume we always know if a thread exits. If a whole process | |
1211 | exited but we still haven't been able to report it to GDB, we'll | |
1212 | hold on to the last lwp of the dead process. */ | |
1213 | if (lwp != NULL) | |
1214 | return !lwp->dead; | |
0d62e5e8 DJ |
1215 | else |
1216 | return 0; | |
1217 | } | |
1218 | ||
6bf5e0ba | 1219 | /* Return 1 if this lwp has an interesting status pending. */ |
611cb4a5 | 1220 | static int |
d50171e4 | 1221 | status_pending_p_callback (struct inferior_list_entry *entry, void *arg) |
0d62e5e8 | 1222 | { |
54a0b537 | 1223 | struct lwp_info *lwp = (struct lwp_info *) entry; |
95954743 | 1224 | ptid_t ptid = * (ptid_t *) arg; |
7984d532 | 1225 | struct thread_info *thread; |
95954743 PA |
1226 | |
1227 | /* Check if we're only interested in events from a specific process | |
1228 | or its lwps. */ | |
1229 | if (!ptid_equal (minus_one_ptid, ptid) | |
1230 | && ptid_get_pid (ptid) != ptid_get_pid (lwp->head.id)) | |
1231 | return 0; | |
0d62e5e8 | 1232 | |
d50171e4 PA |
1233 | thread = get_lwp_thread (lwp); |
1234 | ||
1235 | /* If we got a `vCont;t', but we haven't reported a stop yet, do | |
1236 | report any status pending the LWP may have. */ | |
8336d594 | 1237 | if (thread->last_resume_kind == resume_stop |
7984d532 | 1238 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) |
d50171e4 | 1239 | return 0; |
0d62e5e8 | 1240 | |
d50171e4 | 1241 | return lwp->status_pending_p; |
0d62e5e8 DJ |
1242 | } |
1243 | ||
95954743 PA |
1244 | static int |
1245 | same_lwp (struct inferior_list_entry *entry, void *data) | |
1246 | { | |
1247 | ptid_t ptid = *(ptid_t *) data; | |
1248 | int lwp; | |
1249 | ||
1250 | if (ptid_get_lwp (ptid) != 0) | |
1251 | lwp = ptid_get_lwp (ptid); | |
1252 | else | |
1253 | lwp = ptid_get_pid (ptid); | |
1254 | ||
1255 | if (ptid_get_lwp (entry->id) == lwp) | |
1256 | return 1; | |
1257 | ||
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | struct lwp_info * | |
1262 | find_lwp_pid (ptid_t ptid) | |
1263 | { | |
1264 | return (struct lwp_info*) find_inferior (&all_lwps, same_lwp, &ptid); | |
1265 | } | |
1266 | ||
bd99dc85 | 1267 | static struct lwp_info * |
95954743 | 1268 | linux_wait_for_lwp (ptid_t ptid, int *wstatp, int options) |
611cb4a5 | 1269 | { |
0d62e5e8 | 1270 | int ret; |
95954743 | 1271 | int to_wait_for = -1; |
bd99dc85 | 1272 | struct lwp_info *child = NULL; |
0d62e5e8 | 1273 | |
bd99dc85 | 1274 | if (debug_threads) |
95954743 PA |
1275 | fprintf (stderr, "linux_wait_for_lwp: %s\n", target_pid_to_str (ptid)); |
1276 | ||
1277 | if (ptid_equal (ptid, minus_one_ptid)) | |
1278 | to_wait_for = -1; /* any child */ | |
1279 | else | |
1280 | to_wait_for = ptid_get_lwp (ptid); /* this lwp only */ | |
0d62e5e8 | 1281 | |
bd99dc85 | 1282 | options |= __WALL; |
0d62e5e8 | 1283 | |
bd99dc85 | 1284 | retry: |
0d62e5e8 | 1285 | |
bd99dc85 PA |
1286 | ret = my_waitpid (to_wait_for, wstatp, options); |
1287 | if (ret == 0 || (ret == -1 && errno == ECHILD && (options & WNOHANG))) | |
1288 | return NULL; | |
1289 | else if (ret == -1) | |
1290 | perror_with_name ("waitpid"); | |
0d62e5e8 DJ |
1291 | |
1292 | if (debug_threads | |
1293 | && (!WIFSTOPPED (*wstatp) | |
1294 | || (WSTOPSIG (*wstatp) != 32 | |
1295 | && WSTOPSIG (*wstatp) != 33))) | |
1296 | fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp); | |
1297 | ||
95954743 | 1298 | child = find_lwp_pid (pid_to_ptid (ret)); |
0d62e5e8 | 1299 | |
24a09b5f DJ |
1300 | /* If we didn't find a process, one of two things presumably happened: |
1301 | - A process we started and then detached from has exited. Ignore it. | |
1302 | - A process we are controlling has forked and the new child's stop | |
1303 | was reported to us by the kernel. Save its PID. */ | |
bd99dc85 | 1304 | if (child == NULL && WIFSTOPPED (*wstatp)) |
24a09b5f | 1305 | { |
05044653 | 1306 | add_to_pid_list (&stopped_pids, ret, *wstatp); |
24a09b5f DJ |
1307 | goto retry; |
1308 | } | |
bd99dc85 | 1309 | else if (child == NULL) |
24a09b5f DJ |
1310 | goto retry; |
1311 | ||
bd99dc85 | 1312 | child->stopped = 1; |
0d62e5e8 | 1313 | |
bd99dc85 | 1314 | child->last_status = *wstatp; |
32ca6d61 | 1315 | |
3aee8918 | 1316 | if (WIFSTOPPED (*wstatp)) |
d61ddec4 | 1317 | { |
3aee8918 PA |
1318 | struct process_info *proc; |
1319 | ||
1320 | /* Architecture-specific setup after inferior is running. This | |
1321 | needs to happen after we have attached to the inferior and it | |
1322 | is stopped for the first time, but before we access any | |
1323 | inferior registers. */ | |
1324 | proc = find_process_pid (pid_of (child)); | |
1325 | if (proc->private->new_inferior) | |
1326 | { | |
1327 | struct thread_info *saved_inferior; | |
1328 | ||
1329 | saved_inferior = current_inferior; | |
1330 | current_inferior = get_lwp_thread (child); | |
1331 | ||
1332 | the_low_target.arch_setup (); | |
1333 | ||
1334 | current_inferior = saved_inferior; | |
1335 | ||
1336 | proc->private->new_inferior = 0; | |
1337 | } | |
d61ddec4 UW |
1338 | } |
1339 | ||
c3adc08c PA |
1340 | /* Fetch the possibly triggered data watchpoint info and store it in |
1341 | CHILD. | |
1342 | ||
1343 | On some archs, like x86, that use debug registers to set | |
1344 | watchpoints, it's possible that the way to know which watched | |
1345 | address trapped, is to check the register that is used to select | |
1346 | which address to watch. Problem is, between setting the | |
1347 | watchpoint and reading back which data address trapped, the user | |
1348 | may change the set of watchpoints, and, as a consequence, GDB | |
1349 | changes the debug registers in the inferior. To avoid reading | |
1350 | back a stale stopped-data-address when that happens, we cache in | |
1351 | LP the fact that a watchpoint trapped, and the corresponding data | |
1352 | address, as soon as we see CHILD stop with a SIGTRAP. If GDB | |
1353 | changes the debug registers meanwhile, we have the cached data we | |
1354 | can rely on. */ | |
1355 | ||
1356 | if (WIFSTOPPED (*wstatp) && WSTOPSIG (*wstatp) == SIGTRAP) | |
1357 | { | |
1358 | if (the_low_target.stopped_by_watchpoint == NULL) | |
1359 | { | |
1360 | child->stopped_by_watchpoint = 0; | |
1361 | } | |
1362 | else | |
1363 | { | |
1364 | struct thread_info *saved_inferior; | |
1365 | ||
1366 | saved_inferior = current_inferior; | |
1367 | current_inferior = get_lwp_thread (child); | |
1368 | ||
1369 | child->stopped_by_watchpoint | |
1370 | = the_low_target.stopped_by_watchpoint (); | |
1371 | ||
1372 | if (child->stopped_by_watchpoint) | |
1373 | { | |
1374 | if (the_low_target.stopped_data_address != NULL) | |
1375 | child->stopped_data_address | |
1376 | = the_low_target.stopped_data_address (); | |
1377 | else | |
1378 | child->stopped_data_address = 0; | |
1379 | } | |
1380 | ||
1381 | current_inferior = saved_inferior; | |
1382 | } | |
1383 | } | |
1384 | ||
d50171e4 PA |
1385 | /* Store the STOP_PC, with adjustment applied. This depends on the |
1386 | architecture being defined already (so that CHILD has a valid | |
1387 | regcache), and on LAST_STATUS being set (to check for SIGTRAP or | |
1388 | not). */ | |
1389 | if (WIFSTOPPED (*wstatp)) | |
1390 | child->stop_pc = get_stop_pc (child); | |
1391 | ||
0d62e5e8 | 1392 | if (debug_threads |
47c0c975 DE |
1393 | && WIFSTOPPED (*wstatp) |
1394 | && the_low_target.get_pc != NULL) | |
0d62e5e8 | 1395 | { |
896c7fbb | 1396 | struct thread_info *saved_inferior = current_inferior; |
bce522a2 | 1397 | struct regcache *regcache; |
47c0c975 DE |
1398 | CORE_ADDR pc; |
1399 | ||
d50171e4 | 1400 | current_inferior = get_lwp_thread (child); |
bce522a2 | 1401 | regcache = get_thread_regcache (current_inferior, 1); |
442ea881 | 1402 | pc = (*the_low_target.get_pc) (regcache); |
47c0c975 | 1403 | fprintf (stderr, "linux_wait_for_lwp: pc is 0x%lx\n", (long) pc); |
896c7fbb | 1404 | current_inferior = saved_inferior; |
0d62e5e8 | 1405 | } |
bd99dc85 PA |
1406 | |
1407 | return child; | |
0d62e5e8 | 1408 | } |
611cb4a5 | 1409 | |
219f2f23 PA |
1410 | /* This function should only be called if the LWP got a SIGTRAP. |
1411 | ||
1412 | Handle any tracepoint steps or hits. Return true if a tracepoint | |
1413 | event was handled, 0 otherwise. */ | |
1414 | ||
1415 | static int | |
1416 | handle_tracepoints (struct lwp_info *lwp) | |
1417 | { | |
1418 | struct thread_info *tinfo = get_lwp_thread (lwp); | |
1419 | int tpoint_related_event = 0; | |
1420 | ||
7984d532 PA |
1421 | /* If this tracepoint hit causes a tracing stop, we'll immediately |
1422 | uninsert tracepoints. To do this, we temporarily pause all | |
1423 | threads, unpatch away, and then unpause threads. We need to make | |
1424 | sure the unpausing doesn't resume LWP too. */ | |
1425 | lwp->suspended++; | |
1426 | ||
219f2f23 PA |
1427 | /* And we need to be sure that any all-threads-stopping doesn't try |
1428 | to move threads out of the jump pads, as it could deadlock the | |
1429 | inferior (LWP could be in the jump pad, maybe even holding the | |
1430 | lock.) */ | |
1431 | ||
1432 | /* Do any necessary step collect actions. */ | |
1433 | tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc); | |
1434 | ||
fa593d66 PA |
1435 | tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc); |
1436 | ||
219f2f23 PA |
1437 | /* See if we just hit a tracepoint and do its main collect |
1438 | actions. */ | |
1439 | tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc); | |
1440 | ||
7984d532 PA |
1441 | lwp->suspended--; |
1442 | ||
1443 | gdb_assert (lwp->suspended == 0); | |
fa593d66 | 1444 | gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint); |
7984d532 | 1445 | |
219f2f23 PA |
1446 | if (tpoint_related_event) |
1447 | { | |
1448 | if (debug_threads) | |
1449 | fprintf (stderr, "got a tracepoint event\n"); | |
1450 | return 1; | |
1451 | } | |
1452 | ||
1453 | return 0; | |
1454 | } | |
1455 | ||
fa593d66 PA |
1456 | /* Convenience wrapper. Returns true if LWP is presently collecting a |
1457 | fast tracepoint. */ | |
1458 | ||
1459 | static int | |
1460 | linux_fast_tracepoint_collecting (struct lwp_info *lwp, | |
1461 | struct fast_tpoint_collect_status *status) | |
1462 | { | |
1463 | CORE_ADDR thread_area; | |
1464 | ||
1465 | if (the_low_target.get_thread_area == NULL) | |
1466 | return 0; | |
1467 | ||
1468 | /* Get the thread area address. This is used to recognize which | |
1469 | thread is which when tracing with the in-process agent library. | |
1470 | We don't read anything from the address, and treat it as opaque; | |
1471 | it's the address itself that we assume is unique per-thread. */ | |
1472 | if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1) | |
1473 | return 0; | |
1474 | ||
1475 | return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status); | |
1476 | } | |
1477 | ||
1478 | /* The reason we resume in the caller, is because we want to be able | |
1479 | to pass lwp->status_pending as WSTAT, and we need to clear | |
1480 | status_pending_p before resuming, otherwise, linux_resume_one_lwp | |
1481 | refuses to resume. */ | |
1482 | ||
1483 | static int | |
1484 | maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat) | |
1485 | { | |
1486 | struct thread_info *saved_inferior; | |
1487 | ||
1488 | saved_inferior = current_inferior; | |
1489 | current_inferior = get_lwp_thread (lwp); | |
1490 | ||
1491 | if ((wstat == NULL | |
1492 | || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP)) | |
1493 | && supports_fast_tracepoints () | |
58b4daa5 | 1494 | && agent_loaded_p ()) |
fa593d66 PA |
1495 | { |
1496 | struct fast_tpoint_collect_status status; | |
1497 | int r; | |
1498 | ||
1499 | if (debug_threads) | |
1500 | fprintf (stderr, "\ | |
1501 | Checking whether LWP %ld needs to move out of the jump pad.\n", | |
1502 | lwpid_of (lwp)); | |
1503 | ||
1504 | r = linux_fast_tracepoint_collecting (lwp, &status); | |
1505 | ||
1506 | if (wstat == NULL | |
1507 | || (WSTOPSIG (*wstat) != SIGILL | |
1508 | && WSTOPSIG (*wstat) != SIGFPE | |
1509 | && WSTOPSIG (*wstat) != SIGSEGV | |
1510 | && WSTOPSIG (*wstat) != SIGBUS)) | |
1511 | { | |
1512 | lwp->collecting_fast_tracepoint = r; | |
1513 | ||
1514 | if (r != 0) | |
1515 | { | |
1516 | if (r == 1 && lwp->exit_jump_pad_bkpt == NULL) | |
1517 | { | |
1518 | /* Haven't executed the original instruction yet. | |
1519 | Set breakpoint there, and wait till it's hit, | |
1520 | then single-step until exiting the jump pad. */ | |
1521 | lwp->exit_jump_pad_bkpt | |
1522 | = set_breakpoint_at (status.adjusted_insn_addr, NULL); | |
1523 | } | |
1524 | ||
1525 | if (debug_threads) | |
1526 | fprintf (stderr, "\ | |
1527 | Checking whether LWP %ld needs to move out of the jump pad...it does\n", | |
1528 | lwpid_of (lwp)); | |
0cccb683 | 1529 | current_inferior = saved_inferior; |
fa593d66 PA |
1530 | |
1531 | return 1; | |
1532 | } | |
1533 | } | |
1534 | else | |
1535 | { | |
1536 | /* If we get a synchronous signal while collecting, *and* | |
1537 | while executing the (relocated) original instruction, | |
1538 | reset the PC to point at the tpoint address, before | |
1539 | reporting to GDB. Otherwise, it's an IPA lib bug: just | |
1540 | report the signal to GDB, and pray for the best. */ | |
1541 | ||
1542 | lwp->collecting_fast_tracepoint = 0; | |
1543 | ||
1544 | if (r != 0 | |
1545 | && (status.adjusted_insn_addr <= lwp->stop_pc | |
1546 | && lwp->stop_pc < status.adjusted_insn_addr_end)) | |
1547 | { | |
1548 | siginfo_t info; | |
1549 | struct regcache *regcache; | |
1550 | ||
1551 | /* The si_addr on a few signals references the address | |
1552 | of the faulting instruction. Adjust that as | |
1553 | well. */ | |
1554 | if ((WSTOPSIG (*wstat) == SIGILL | |
1555 | || WSTOPSIG (*wstat) == SIGFPE | |
1556 | || WSTOPSIG (*wstat) == SIGBUS | |
1557 | || WSTOPSIG (*wstat) == SIGSEGV) | |
56f7af9c | 1558 | && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), |
b8e1b30e | 1559 | (PTRACE_TYPE_ARG3) 0, &info) == 0 |
fa593d66 PA |
1560 | /* Final check just to make sure we don't clobber |
1561 | the siginfo of non-kernel-sent signals. */ | |
1562 | && (uintptr_t) info.si_addr == lwp->stop_pc) | |
1563 | { | |
1564 | info.si_addr = (void *) (uintptr_t) status.tpoint_addr; | |
56f7af9c | 1565 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), |
b8e1b30e | 1566 | (PTRACE_TYPE_ARG3) 0, &info); |
fa593d66 PA |
1567 | } |
1568 | ||
1569 | regcache = get_thread_regcache (get_lwp_thread (lwp), 1); | |
1570 | (*the_low_target.set_pc) (regcache, status.tpoint_addr); | |
1571 | lwp->stop_pc = status.tpoint_addr; | |
1572 | ||
1573 | /* Cancel any fast tracepoint lock this thread was | |
1574 | holding. */ | |
1575 | force_unlock_trace_buffer (); | |
1576 | } | |
1577 | ||
1578 | if (lwp->exit_jump_pad_bkpt != NULL) | |
1579 | { | |
1580 | if (debug_threads) | |
1581 | fprintf (stderr, | |
1582 | "Cancelling fast exit-jump-pad: removing bkpt. " | |
1583 | "stopping all threads momentarily.\n"); | |
1584 | ||
1585 | stop_all_lwps (1, lwp); | |
1586 | cancel_breakpoints (); | |
1587 | ||
1588 | delete_breakpoint (lwp->exit_jump_pad_bkpt); | |
1589 | lwp->exit_jump_pad_bkpt = NULL; | |
1590 | ||
1591 | unstop_all_lwps (1, lwp); | |
1592 | ||
1593 | gdb_assert (lwp->suspended >= 0); | |
1594 | } | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | if (debug_threads) | |
1599 | fprintf (stderr, "\ | |
1600 | Checking whether LWP %ld needs to move out of the jump pad...no\n", | |
1601 | lwpid_of (lwp)); | |
0cccb683 YQ |
1602 | |
1603 | current_inferior = saved_inferior; | |
fa593d66 PA |
1604 | return 0; |
1605 | } | |
1606 | ||
1607 | /* Enqueue one signal in the "signals to report later when out of the | |
1608 | jump pad" list. */ | |
1609 | ||
1610 | static void | |
1611 | enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1612 | { | |
1613 | struct pending_signals *p_sig; | |
1614 | ||
1615 | if (debug_threads) | |
1616 | fprintf (stderr, "\ | |
1617 | Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1618 | ||
1619 | if (debug_threads) | |
1620 | { | |
1621 | struct pending_signals *sig; | |
1622 | ||
1623 | for (sig = lwp->pending_signals_to_report; | |
1624 | sig != NULL; | |
1625 | sig = sig->prev) | |
1626 | fprintf (stderr, | |
1627 | " Already queued %d\n", | |
1628 | sig->signal); | |
1629 | ||
1630 | fprintf (stderr, " (no more currently queued signals)\n"); | |
1631 | } | |
1632 | ||
1a981360 PA |
1633 | /* Don't enqueue non-RT signals if they are already in the deferred |
1634 | queue. (SIGSTOP being the easiest signal to see ending up here | |
1635 | twice) */ | |
1636 | if (WSTOPSIG (*wstat) < __SIGRTMIN) | |
1637 | { | |
1638 | struct pending_signals *sig; | |
1639 | ||
1640 | for (sig = lwp->pending_signals_to_report; | |
1641 | sig != NULL; | |
1642 | sig = sig->prev) | |
1643 | { | |
1644 | if (sig->signal == WSTOPSIG (*wstat)) | |
1645 | { | |
1646 | if (debug_threads) | |
1647 | fprintf (stderr, | |
1648 | "Not requeuing already queued non-RT signal %d" | |
1649 | " for LWP %ld\n", | |
1650 | sig->signal, | |
1651 | lwpid_of (lwp)); | |
1652 | return; | |
1653 | } | |
1654 | } | |
1655 | } | |
1656 | ||
fa593d66 PA |
1657 | p_sig = xmalloc (sizeof (*p_sig)); |
1658 | p_sig->prev = lwp->pending_signals_to_report; | |
1659 | p_sig->signal = WSTOPSIG (*wstat); | |
1660 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
b8e1b30e | 1661 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1662 | &p_sig->info); |
fa593d66 PA |
1663 | |
1664 | lwp->pending_signals_to_report = p_sig; | |
1665 | } | |
1666 | ||
1667 | /* Dequeue one signal from the "signals to report later when out of | |
1668 | the jump pad" list. */ | |
1669 | ||
1670 | static int | |
1671 | dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat) | |
1672 | { | |
1673 | if (lwp->pending_signals_to_report != NULL) | |
1674 | { | |
1675 | struct pending_signals **p_sig; | |
1676 | ||
1677 | p_sig = &lwp->pending_signals_to_report; | |
1678 | while ((*p_sig)->prev != NULL) | |
1679 | p_sig = &(*p_sig)->prev; | |
1680 | ||
1681 | *wstat = W_STOPCODE ((*p_sig)->signal); | |
1682 | if ((*p_sig)->info.si_signo != 0) | |
b8e1b30e | 1683 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 1684 | &(*p_sig)->info); |
fa593d66 PA |
1685 | free (*p_sig); |
1686 | *p_sig = NULL; | |
1687 | ||
1688 | if (debug_threads) | |
1689 | fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n", | |
1690 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
1691 | ||
1692 | if (debug_threads) | |
1693 | { | |
1694 | struct pending_signals *sig; | |
1695 | ||
1696 | for (sig = lwp->pending_signals_to_report; | |
1697 | sig != NULL; | |
1698 | sig = sig->prev) | |
1699 | fprintf (stderr, | |
1700 | " Still queued %d\n", | |
1701 | sig->signal); | |
1702 | ||
1703 | fprintf (stderr, " (no more queued signals)\n"); | |
1704 | } | |
1705 | ||
1706 | return 1; | |
1707 | } | |
1708 | ||
1709 | return 0; | |
1710 | } | |
1711 | ||
d50171e4 PA |
1712 | /* Arrange for a breakpoint to be hit again later. We don't keep the |
1713 | SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We | |
1714 | will handle the current event, eventually we will resume this LWP, | |
1715 | and this breakpoint will trap again. */ | |
1716 | ||
1717 | static int | |
1718 | cancel_breakpoint (struct lwp_info *lwp) | |
1719 | { | |
1720 | struct thread_info *saved_inferior; | |
d50171e4 PA |
1721 | |
1722 | /* There's nothing to do if we don't support breakpoints. */ | |
1723 | if (!supports_breakpoints ()) | |
1724 | return 0; | |
1725 | ||
d50171e4 PA |
1726 | /* breakpoint_at reads from current inferior. */ |
1727 | saved_inferior = current_inferior; | |
1728 | current_inferior = get_lwp_thread (lwp); | |
1729 | ||
1730 | if ((*the_low_target.breakpoint_at) (lwp->stop_pc)) | |
1731 | { | |
1732 | if (debug_threads) | |
1733 | fprintf (stderr, | |
1734 | "CB: Push back breakpoint for %s\n", | |
fc7238bb | 1735 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1736 | |
1737 | /* Back up the PC if necessary. */ | |
1738 | if (the_low_target.decr_pc_after_break) | |
1739 | { | |
1740 | struct regcache *regcache | |
fc7238bb | 1741 | = get_thread_regcache (current_inferior, 1); |
d50171e4 PA |
1742 | (*the_low_target.set_pc) (regcache, lwp->stop_pc); |
1743 | } | |
1744 | ||
1745 | current_inferior = saved_inferior; | |
1746 | return 1; | |
1747 | } | |
1748 | else | |
1749 | { | |
1750 | if (debug_threads) | |
1751 | fprintf (stderr, | |
1752 | "CB: No breakpoint found at %s for [%s]\n", | |
1753 | paddress (lwp->stop_pc), | |
fc7238bb | 1754 | target_pid_to_str (ptid_of (lwp))); |
d50171e4 PA |
1755 | } |
1756 | ||
1757 | current_inferior = saved_inferior; | |
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | /* When the event-loop is doing a step-over, this points at the thread | |
1762 | being stepped. */ | |
1763 | ptid_t step_over_bkpt; | |
1764 | ||
bd99dc85 PA |
1765 | /* Wait for an event from child PID. If PID is -1, wait for any |
1766 | child. Store the stop status through the status pointer WSTAT. | |
1767 | OPTIONS is passed to the waitpid call. Return 0 if no child stop | |
1768 | event was found and OPTIONS contains WNOHANG. Return the PID of | |
1769 | the stopped child otherwise. */ | |
1770 | ||
0d62e5e8 | 1771 | static int |
d8301ad1 | 1772 | linux_wait_for_event (ptid_t ptid, int *wstat, int options) |
0d62e5e8 | 1773 | { |
d50171e4 | 1774 | struct lwp_info *event_child, *requested_child; |
d8301ad1 | 1775 | ptid_t wait_ptid; |
d50171e4 | 1776 | |
d50171e4 PA |
1777 | event_child = NULL; |
1778 | requested_child = NULL; | |
0d62e5e8 | 1779 | |
95954743 | 1780 | /* Check for a lwp with a pending status. */ |
bd99dc85 | 1781 | |
e825046f | 1782 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
0d62e5e8 | 1783 | { |
54a0b537 | 1784 | event_child = (struct lwp_info *) |
d50171e4 | 1785 | find_inferior (&all_lwps, status_pending_p_callback, &ptid); |
0d62e5e8 | 1786 | if (debug_threads && event_child) |
bd99dc85 | 1787 | fprintf (stderr, "Got a pending child %ld\n", lwpid_of (event_child)); |
0d62e5e8 DJ |
1788 | } |
1789 | else | |
1790 | { | |
95954743 | 1791 | requested_child = find_lwp_pid (ptid); |
d50171e4 | 1792 | |
bde24c0a | 1793 | if (stopping_threads == NOT_STOPPING_THREADS |
fa593d66 PA |
1794 | && requested_child->status_pending_p |
1795 | && requested_child->collecting_fast_tracepoint) | |
1796 | { | |
1797 | enqueue_one_deferred_signal (requested_child, | |
1798 | &requested_child->status_pending); | |
1799 | requested_child->status_pending_p = 0; | |
1800 | requested_child->status_pending = 0; | |
1801 | linux_resume_one_lwp (requested_child, 0, 0, NULL); | |
1802 | } | |
1803 | ||
1804 | if (requested_child->suspended | |
1805 | && requested_child->status_pending_p) | |
1806 | fatal ("requesting an event out of a suspended child?"); | |
1807 | ||
d50171e4 | 1808 | if (requested_child->status_pending_p) |
bd99dc85 | 1809 | event_child = requested_child; |
0d62e5e8 | 1810 | } |
611cb4a5 | 1811 | |
0d62e5e8 DJ |
1812 | if (event_child != NULL) |
1813 | { | |
bd99dc85 PA |
1814 | if (debug_threads) |
1815 | fprintf (stderr, "Got an event from pending child %ld (%04x)\n", | |
1816 | lwpid_of (event_child), event_child->status_pending); | |
1817 | *wstat = event_child->status_pending; | |
1818 | event_child->status_pending_p = 0; | |
1819 | event_child->status_pending = 0; | |
1820 | current_inferior = get_lwp_thread (event_child); | |
1821 | return lwpid_of (event_child); | |
0d62e5e8 DJ |
1822 | } |
1823 | ||
d8301ad1 JK |
1824 | if (ptid_is_pid (ptid)) |
1825 | { | |
1826 | /* A request to wait for a specific tgid. This is not possible | |
1827 | with waitpid, so instead, we wait for any child, and leave | |
1828 | children we're not interested in right now with a pending | |
1829 | status to report later. */ | |
1830 | wait_ptid = minus_one_ptid; | |
1831 | } | |
1832 | else | |
1833 | wait_ptid = ptid; | |
1834 | ||
0d62e5e8 DJ |
1835 | /* We only enter this loop if no process has a pending wait status. Thus |
1836 | any action taken in response to a wait status inside this loop is | |
1837 | responding as soon as we detect the status, not after any pending | |
1838 | events. */ | |
1839 | while (1) | |
1840 | { | |
d8301ad1 | 1841 | event_child = linux_wait_for_lwp (wait_ptid, wstat, options); |
0d62e5e8 | 1842 | |
bd99dc85 | 1843 | if ((options & WNOHANG) && event_child == NULL) |
d50171e4 PA |
1844 | { |
1845 | if (debug_threads) | |
1846 | fprintf (stderr, "WNOHANG set, no event found\n"); | |
1847 | return 0; | |
1848 | } | |
0d62e5e8 DJ |
1849 | |
1850 | if (event_child == NULL) | |
1851 | error ("event from unknown child"); | |
611cb4a5 | 1852 | |
d8301ad1 JK |
1853 | if (ptid_is_pid (ptid) |
1854 | && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child))) | |
1855 | { | |
1856 | if (! WIFSTOPPED (*wstat)) | |
1857 | mark_lwp_dead (event_child, *wstat); | |
1858 | else | |
1859 | { | |
1860 | event_child->status_pending_p = 1; | |
1861 | event_child->status_pending = *wstat; | |
1862 | } | |
1863 | continue; | |
1864 | } | |
1865 | ||
bd99dc85 | 1866 | current_inferior = get_lwp_thread (event_child); |
0d62e5e8 | 1867 | |
89be2091 | 1868 | /* Check for thread exit. */ |
bd99dc85 | 1869 | if (! WIFSTOPPED (*wstat)) |
0d62e5e8 | 1870 | { |
89be2091 | 1871 | if (debug_threads) |
95954743 | 1872 | fprintf (stderr, "LWP %ld exiting\n", lwpid_of (event_child)); |
89be2091 DJ |
1873 | |
1874 | /* If the last thread is exiting, just return. */ | |
95954743 | 1875 | if (last_thread_of_process_p (current_inferior)) |
bd99dc85 PA |
1876 | { |
1877 | if (debug_threads) | |
95954743 PA |
1878 | fprintf (stderr, "LWP %ld is last lwp of process\n", |
1879 | lwpid_of (event_child)); | |
bd99dc85 PA |
1880 | return lwpid_of (event_child); |
1881 | } | |
89be2091 | 1882 | |
bd99dc85 PA |
1883 | if (!non_stop) |
1884 | { | |
1885 | current_inferior = (struct thread_info *) all_threads.head; | |
1886 | if (debug_threads) | |
1887 | fprintf (stderr, "Current inferior is now %ld\n", | |
1888 | lwpid_of (get_thread_lwp (current_inferior))); | |
1889 | } | |
1890 | else | |
1891 | { | |
1892 | current_inferior = NULL; | |
1893 | if (debug_threads) | |
1894 | fprintf (stderr, "Current inferior is now <NULL>\n"); | |
1895 | } | |
89be2091 DJ |
1896 | |
1897 | /* If we were waiting for this particular child to do something... | |
1898 | well, it did something. */ | |
bd99dc85 | 1899 | if (requested_child != NULL) |
d50171e4 PA |
1900 | { |
1901 | int lwpid = lwpid_of (event_child); | |
1902 | ||
1903 | /* Cancel the step-over operation --- the thread that | |
1904 | started it is gone. */ | |
1905 | if (finish_step_over (event_child)) | |
7984d532 | 1906 | unstop_all_lwps (1, event_child); |
d50171e4 PA |
1907 | delete_lwp (event_child); |
1908 | return lwpid; | |
1909 | } | |
1910 | ||
1911 | delete_lwp (event_child); | |
89be2091 DJ |
1912 | |
1913 | /* Wait for a more interesting event. */ | |
1914 | continue; | |
1915 | } | |
1916 | ||
a6dbe5df PA |
1917 | if (event_child->must_set_ptrace_flags) |
1918 | { | |
1e7fc18c | 1919 | linux_enable_event_reporting (lwpid_of (event_child)); |
a6dbe5df PA |
1920 | event_child->must_set_ptrace_flags = 0; |
1921 | } | |
1922 | ||
bd99dc85 PA |
1923 | if (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) == SIGTRAP |
1924 | && *wstat >> 16 != 0) | |
24a09b5f | 1925 | { |
bd99dc85 | 1926 | handle_extended_wait (event_child, *wstat); |
24a09b5f DJ |
1927 | continue; |
1928 | } | |
1929 | ||
d50171e4 PA |
1930 | if (WIFSTOPPED (*wstat) |
1931 | && WSTOPSIG (*wstat) == SIGSTOP | |
1932 | && event_child->stop_expected) | |
1933 | { | |
1934 | int should_stop; | |
1935 | ||
1936 | if (debug_threads) | |
1937 | fprintf (stderr, "Expected stop.\n"); | |
1938 | event_child->stop_expected = 0; | |
1939 | ||
8336d594 | 1940 | should_stop = (current_inferior->last_resume_kind == resume_stop |
bde24c0a | 1941 | || stopping_threads != NOT_STOPPING_THREADS); |
d50171e4 PA |
1942 | |
1943 | if (!should_stop) | |
1944 | { | |
1945 | linux_resume_one_lwp (event_child, | |
1946 | event_child->stepping, 0, NULL); | |
1947 | continue; | |
1948 | } | |
1949 | } | |
1950 | ||
bd99dc85 | 1951 | return lwpid_of (event_child); |
611cb4a5 | 1952 | } |
0d62e5e8 | 1953 | |
611cb4a5 DJ |
1954 | /* NOTREACHED */ |
1955 | return 0; | |
1956 | } | |
1957 | ||
6bf5e0ba PA |
1958 | /* Count the LWP's that have had events. */ |
1959 | ||
1960 | static int | |
1961 | count_events_callback (struct inferior_list_entry *entry, void *data) | |
1962 | { | |
1963 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1964 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
1965 | int *count = data; |
1966 | ||
1967 | gdb_assert (count != NULL); | |
1968 | ||
1969 | /* Count only resumed LWPs that have a SIGTRAP event pending that | |
1970 | should be reported to GDB. */ | |
8336d594 PA |
1971 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1972 | && thread->last_resume_kind != resume_stop | |
6bf5e0ba PA |
1973 | && lp->status_pending_p |
1974 | && WIFSTOPPED (lp->status_pending) | |
1975 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
1976 | && !breakpoint_inserted_here (lp->stop_pc)) | |
1977 | (*count)++; | |
1978 | ||
1979 | return 0; | |
1980 | } | |
1981 | ||
1982 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
1983 | ||
1984 | static int | |
1985 | select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data) | |
1986 | { | |
1987 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 1988 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba | 1989 | |
8336d594 PA |
1990 | if (thread->last_status.kind == TARGET_WAITKIND_IGNORE |
1991 | && thread->last_resume_kind == resume_step | |
6bf5e0ba PA |
1992 | && lp->status_pending_p) |
1993 | return 1; | |
1994 | else | |
1995 | return 0; | |
1996 | } | |
1997 | ||
1998 | /* Select the Nth LWP that has had a SIGTRAP event that should be | |
1999 | reported to GDB. */ | |
2000 | ||
2001 | static int | |
2002 | select_event_lwp_callback (struct inferior_list_entry *entry, void *data) | |
2003 | { | |
2004 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2005 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2006 | int *selector = data; |
2007 | ||
2008 | gdb_assert (selector != NULL); | |
2009 | ||
2010 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ | |
8336d594 PA |
2011 | if (thread->last_resume_kind != resume_stop |
2012 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2013 | && lp->status_pending_p |
2014 | && WIFSTOPPED (lp->status_pending) | |
2015 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
2016 | && !breakpoint_inserted_here (lp->stop_pc)) | |
2017 | if ((*selector)-- == 0) | |
2018 | return 1; | |
2019 | ||
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | static int | |
2024 | cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data) | |
2025 | { | |
2026 | struct lwp_info *lp = (struct lwp_info *) entry; | |
8336d594 | 2027 | struct thread_info *thread = get_lwp_thread (lp); |
6bf5e0ba PA |
2028 | struct lwp_info *event_lp = data; |
2029 | ||
2030 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2031 | if (lp == event_lp) | |
2032 | return 0; | |
2033 | ||
2034 | /* If a LWP other than the LWP that we're reporting an event for has | |
2035 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2036 | then just arrange for it to hit it again later. We don't keep | |
2037 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2038 | LWP. We will handle the current event, eventually we will resume | |
2039 | all LWPs, and this one will get its breakpoint trap again. | |
2040 | ||
2041 | If we do not do this, then we run the risk that the user will | |
2042 | delete or disable the breakpoint, but the LWP will have already | |
2043 | tripped on it. */ | |
2044 | ||
8336d594 PA |
2045 | if (thread->last_resume_kind != resume_stop |
2046 | && thread->last_status.kind == TARGET_WAITKIND_IGNORE | |
6bf5e0ba PA |
2047 | && lp->status_pending_p |
2048 | && WIFSTOPPED (lp->status_pending) | |
2049 | && WSTOPSIG (lp->status_pending) == SIGTRAP | |
bdabb078 PA |
2050 | && !lp->stepping |
2051 | && !lp->stopped_by_watchpoint | |
6bf5e0ba PA |
2052 | && cancel_breakpoint (lp)) |
2053 | /* Throw away the SIGTRAP. */ | |
2054 | lp->status_pending_p = 0; | |
2055 | ||
2056 | return 0; | |
2057 | } | |
2058 | ||
7984d532 PA |
2059 | static void |
2060 | linux_cancel_breakpoints (void) | |
2061 | { | |
2062 | find_inferior (&all_lwps, cancel_breakpoints_callback, NULL); | |
2063 | } | |
2064 | ||
6bf5e0ba PA |
2065 | /* Select one LWP out of those that have events pending. */ |
2066 | ||
2067 | static void | |
2068 | select_event_lwp (struct lwp_info **orig_lp) | |
2069 | { | |
2070 | int num_events = 0; | |
2071 | int random_selector; | |
2072 | struct lwp_info *event_lp; | |
2073 | ||
2074 | /* Give preference to any LWP that is being single-stepped. */ | |
2075 | event_lp | |
2076 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2077 | select_singlestep_lwp_callback, NULL); | |
2078 | if (event_lp != NULL) | |
2079 | { | |
2080 | if (debug_threads) | |
2081 | fprintf (stderr, | |
2082 | "SEL: Select single-step %s\n", | |
2083 | target_pid_to_str (ptid_of (event_lp))); | |
2084 | } | |
2085 | else | |
2086 | { | |
2087 | /* No single-stepping LWP. Select one at random, out of those | |
2088 | which have had SIGTRAP events. */ | |
2089 | ||
2090 | /* First see how many SIGTRAP events we have. */ | |
2091 | find_inferior (&all_lwps, count_events_callback, &num_events); | |
2092 | ||
2093 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2094 | random_selector = (int) | |
2095 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2096 | ||
2097 | if (debug_threads && num_events > 1) | |
2098 | fprintf (stderr, | |
2099 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2100 | num_events, random_selector); | |
2101 | ||
2102 | event_lp = (struct lwp_info *) find_inferior (&all_lwps, | |
2103 | select_event_lwp_callback, | |
2104 | &random_selector); | |
2105 | } | |
2106 | ||
2107 | if (event_lp != NULL) | |
2108 | { | |
2109 | /* Switch the event LWP. */ | |
2110 | *orig_lp = event_lp; | |
2111 | } | |
2112 | } | |
2113 | ||
7984d532 PA |
2114 | /* Decrement the suspend count of an LWP. */ |
2115 | ||
2116 | static int | |
2117 | unsuspend_one_lwp (struct inferior_list_entry *entry, void *except) | |
2118 | { | |
2119 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2120 | ||
2121 | /* Ignore EXCEPT. */ | |
2122 | if (lwp == except) | |
2123 | return 0; | |
2124 | ||
2125 | lwp->suspended--; | |
2126 | ||
2127 | gdb_assert (lwp->suspended >= 0); | |
2128 | return 0; | |
2129 | } | |
2130 | ||
2131 | /* Decrement the suspend count of all LWPs, except EXCEPT, if non | |
2132 | NULL. */ | |
2133 | ||
2134 | static void | |
2135 | unsuspend_all_lwps (struct lwp_info *except) | |
2136 | { | |
2137 | find_inferior (&all_lwps, unsuspend_one_lwp, except); | |
2138 | } | |
2139 | ||
fa593d66 PA |
2140 | static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry); |
2141 | static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry, | |
2142 | void *data); | |
2143 | static int lwp_running (struct inferior_list_entry *entry, void *data); | |
2144 | static ptid_t linux_wait_1 (ptid_t ptid, | |
2145 | struct target_waitstatus *ourstatus, | |
2146 | int target_options); | |
2147 | ||
2148 | /* Stabilize threads (move out of jump pads). | |
2149 | ||
2150 | If a thread is midway collecting a fast tracepoint, we need to | |
2151 | finish the collection and move it out of the jump pad before | |
2152 | reporting the signal. | |
2153 | ||
2154 | This avoids recursion while collecting (when a signal arrives | |
2155 | midway, and the signal handler itself collects), which would trash | |
2156 | the trace buffer. In case the user set a breakpoint in a signal | |
2157 | handler, this avoids the backtrace showing the jump pad, etc.. | |
2158 | Most importantly, there are certain things we can't do safely if | |
2159 | threads are stopped in a jump pad (or in its callee's). For | |
2160 | example: | |
2161 | ||
2162 | - starting a new trace run. A thread still collecting the | |
2163 | previous run, could trash the trace buffer when resumed. The trace | |
2164 | buffer control structures would have been reset but the thread had | |
2165 | no way to tell. The thread could even midway memcpy'ing to the | |
2166 | buffer, which would mean that when resumed, it would clobber the | |
2167 | trace buffer that had been set for a new run. | |
2168 | ||
2169 | - we can't rewrite/reuse the jump pads for new tracepoints | |
2170 | safely. Say you do tstart while a thread is stopped midway while | |
2171 | collecting. When the thread is later resumed, it finishes the | |
2172 | collection, and returns to the jump pad, to execute the original | |
2173 | instruction that was under the tracepoint jump at the time the | |
2174 | older run had been started. If the jump pad had been rewritten | |
2175 | since for something else in the new run, the thread would now | |
2176 | execute the wrong / random instructions. */ | |
2177 | ||
2178 | static void | |
2179 | linux_stabilize_threads (void) | |
2180 | { | |
2181 | struct thread_info *save_inferior; | |
2182 | struct lwp_info *lwp_stuck; | |
2183 | ||
2184 | lwp_stuck | |
2185 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2186 | stuck_in_jump_pad_callback, NULL); | |
2187 | if (lwp_stuck != NULL) | |
2188 | { | |
b4d51a55 PA |
2189 | if (debug_threads) |
2190 | fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n", | |
2191 | lwpid_of (lwp_stuck)); | |
fa593d66 PA |
2192 | return; |
2193 | } | |
2194 | ||
2195 | save_inferior = current_inferior; | |
2196 | ||
2197 | stabilizing_threads = 1; | |
2198 | ||
2199 | /* Kick 'em all. */ | |
2200 | for_each_inferior (&all_lwps, move_out_of_jump_pad_callback); | |
2201 | ||
2202 | /* Loop until all are stopped out of the jump pads. */ | |
2203 | while (find_inferior (&all_lwps, lwp_running, NULL) != NULL) | |
2204 | { | |
2205 | struct target_waitstatus ourstatus; | |
2206 | struct lwp_info *lwp; | |
fa593d66 PA |
2207 | int wstat; |
2208 | ||
2209 | /* Note that we go through the full wait even loop. While | |
2210 | moving threads out of jump pad, we need to be able to step | |
2211 | over internal breakpoints and such. */ | |
32fcada3 | 2212 | linux_wait_1 (minus_one_ptid, &ourstatus, 0); |
fa593d66 PA |
2213 | |
2214 | if (ourstatus.kind == TARGET_WAITKIND_STOPPED) | |
2215 | { | |
2216 | lwp = get_thread_lwp (current_inferior); | |
2217 | ||
2218 | /* Lock it. */ | |
2219 | lwp->suspended++; | |
2220 | ||
a493e3e2 | 2221 | if (ourstatus.value.sig != GDB_SIGNAL_0 |
fa593d66 PA |
2222 | || current_inferior->last_resume_kind == resume_stop) |
2223 | { | |
2ea28649 | 2224 | wstat = W_STOPCODE (gdb_signal_to_host (ourstatus.value.sig)); |
fa593d66 PA |
2225 | enqueue_one_deferred_signal (lwp, &wstat); |
2226 | } | |
2227 | } | |
2228 | } | |
2229 | ||
2230 | find_inferior (&all_lwps, unsuspend_one_lwp, NULL); | |
2231 | ||
2232 | stabilizing_threads = 0; | |
2233 | ||
2234 | current_inferior = save_inferior; | |
2235 | ||
b4d51a55 | 2236 | if (debug_threads) |
fa593d66 | 2237 | { |
b4d51a55 PA |
2238 | lwp_stuck |
2239 | = (struct lwp_info *) find_inferior (&all_lwps, | |
2240 | stuck_in_jump_pad_callback, NULL); | |
2241 | if (lwp_stuck != NULL) | |
fa593d66 PA |
2242 | fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n", |
2243 | lwpid_of (lwp_stuck)); | |
2244 | } | |
2245 | } | |
2246 | ||
0d62e5e8 | 2247 | /* Wait for process, returns status. */ |
da6d8c04 | 2248 | |
95954743 PA |
2249 | static ptid_t |
2250 | linux_wait_1 (ptid_t ptid, | |
2251 | struct target_waitstatus *ourstatus, int target_options) | |
da6d8c04 | 2252 | { |
e5f1222d | 2253 | int w; |
fc7238bb | 2254 | struct lwp_info *event_child; |
bd99dc85 | 2255 | int options; |
bd99dc85 | 2256 | int pid; |
6bf5e0ba PA |
2257 | int step_over_finished; |
2258 | int bp_explains_trap; | |
2259 | int maybe_internal_trap; | |
2260 | int report_to_gdb; | |
219f2f23 | 2261 | int trace_event; |
c2d6af84 | 2262 | int in_step_range; |
bd99dc85 PA |
2263 | |
2264 | /* Translate generic target options into linux options. */ | |
2265 | options = __WALL; | |
2266 | if (target_options & TARGET_WNOHANG) | |
2267 | options |= WNOHANG; | |
0d62e5e8 DJ |
2268 | |
2269 | retry: | |
fa593d66 PA |
2270 | bp_explains_trap = 0; |
2271 | trace_event = 0; | |
c2d6af84 | 2272 | in_step_range = 0; |
bd99dc85 PA |
2273 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
2274 | ||
0d62e5e8 DJ |
2275 | /* If we were only supposed to resume one thread, only wait for |
2276 | that thread - if it's still alive. If it died, however - which | |
2277 | can happen if we're coming from the thread death case below - | |
2278 | then we need to make sure we restart the other threads. We could | |
2279 | pick a thread at random or restart all; restarting all is less | |
2280 | arbitrary. */ | |
95954743 PA |
2281 | if (!non_stop |
2282 | && !ptid_equal (cont_thread, null_ptid) | |
2283 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
0d62e5e8 | 2284 | { |
fc7238bb PA |
2285 | struct thread_info *thread; |
2286 | ||
bd99dc85 PA |
2287 | thread = (struct thread_info *) find_inferior_id (&all_threads, |
2288 | cont_thread); | |
0d62e5e8 DJ |
2289 | |
2290 | /* No stepping, no signal - unless one is pending already, of course. */ | |
bd99dc85 | 2291 | if (thread == NULL) |
64386c31 DJ |
2292 | { |
2293 | struct thread_resume resume_info; | |
95954743 | 2294 | resume_info.thread = minus_one_ptid; |
bd99dc85 PA |
2295 | resume_info.kind = resume_continue; |
2296 | resume_info.sig = 0; | |
2bd7c093 | 2297 | linux_resume (&resume_info, 1); |
64386c31 | 2298 | } |
bd99dc85 | 2299 | else |
95954743 | 2300 | ptid = cont_thread; |
0d62e5e8 | 2301 | } |
da6d8c04 | 2302 | |
6bf5e0ba PA |
2303 | if (ptid_equal (step_over_bkpt, null_ptid)) |
2304 | pid = linux_wait_for_event (ptid, &w, options); | |
2305 | else | |
2306 | { | |
2307 | if (debug_threads) | |
2308 | fprintf (stderr, "step_over_bkpt set [%s], doing a blocking wait\n", | |
2309 | target_pid_to_str (step_over_bkpt)); | |
2310 | pid = linux_wait_for_event (step_over_bkpt, &w, options & ~WNOHANG); | |
2311 | } | |
2312 | ||
bd99dc85 | 2313 | if (pid == 0) /* only if TARGET_WNOHANG */ |
95954743 | 2314 | return null_ptid; |
bd99dc85 | 2315 | |
6bf5e0ba | 2316 | event_child = get_thread_lwp (current_inferior); |
da6d8c04 | 2317 | |
0d62e5e8 DJ |
2318 | /* If we are waiting for a particular child, and it exited, |
2319 | linux_wait_for_event will return its exit status. Similarly if | |
2320 | the last child exited. If this is not the last child, however, | |
2321 | do not report it as exited until there is a 'thread exited' response | |
2322 | available in the remote protocol. Instead, just wait for another event. | |
2323 | This should be safe, because if the thread crashed we will already | |
2324 | have reported the termination signal to GDB; that should stop any | |
2325 | in-progress stepping operations, etc. | |
2326 | ||
2327 | Report the exit status of the last thread to exit. This matches | |
2328 | LinuxThreads' behavior. */ | |
2329 | ||
95954743 | 2330 | if (last_thread_of_process_p (current_inferior)) |
da6d8c04 | 2331 | { |
bd99dc85 | 2332 | if (WIFEXITED (w) || WIFSIGNALED (w)) |
0d62e5e8 | 2333 | { |
bd99dc85 PA |
2334 | if (WIFEXITED (w)) |
2335 | { | |
2336 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
2337 | ourstatus->value.integer = WEXITSTATUS (w); | |
2338 | ||
2339 | if (debug_threads) | |
493e2a69 MS |
2340 | fprintf (stderr, |
2341 | "\nChild exited with retcode = %x \n", | |
2342 | WEXITSTATUS (w)); | |
bd99dc85 PA |
2343 | } |
2344 | else | |
2345 | { | |
2346 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
2ea28649 | 2347 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (w)); |
bd99dc85 PA |
2348 | |
2349 | if (debug_threads) | |
493e2a69 MS |
2350 | fprintf (stderr, |
2351 | "\nChild terminated with signal = %x \n", | |
2352 | WTERMSIG (w)); | |
bd99dc85 PA |
2353 | |
2354 | } | |
5b1c542e | 2355 | |
3e4c1235 | 2356 | return ptid_of (event_child); |
0d62e5e8 | 2357 | } |
da6d8c04 | 2358 | } |
0d62e5e8 | 2359 | else |
da6d8c04 | 2360 | { |
0d62e5e8 DJ |
2361 | if (!WIFSTOPPED (w)) |
2362 | goto retry; | |
da6d8c04 DJ |
2363 | } |
2364 | ||
6bf5e0ba PA |
2365 | /* If this event was not handled before, and is not a SIGTRAP, we |
2366 | report it. SIGILL and SIGSEGV are also treated as traps in case | |
2367 | a breakpoint is inserted at the current PC. If this target does | |
2368 | not support internal breakpoints at all, we also report the | |
2369 | SIGTRAP without further processing; it's of no concern to us. */ | |
2370 | maybe_internal_trap | |
2371 | = (supports_breakpoints () | |
2372 | && (WSTOPSIG (w) == SIGTRAP | |
2373 | || ((WSTOPSIG (w) == SIGILL | |
2374 | || WSTOPSIG (w) == SIGSEGV) | |
2375 | && (*the_low_target.breakpoint_at) (event_child->stop_pc)))); | |
2376 | ||
2377 | if (maybe_internal_trap) | |
2378 | { | |
2379 | /* Handle anything that requires bookkeeping before deciding to | |
2380 | report the event or continue waiting. */ | |
2381 | ||
2382 | /* First check if we can explain the SIGTRAP with an internal | |
2383 | breakpoint, or if we should possibly report the event to GDB. | |
2384 | Do this before anything that may remove or insert a | |
2385 | breakpoint. */ | |
2386 | bp_explains_trap = breakpoint_inserted_here (event_child->stop_pc); | |
2387 | ||
2388 | /* We have a SIGTRAP, possibly a step-over dance has just | |
2389 | finished. If so, tweak the state machine accordingly, | |
2390 | reinsert breakpoints and delete any reinsert (software | |
2391 | single-step) breakpoints. */ | |
2392 | step_over_finished = finish_step_over (event_child); | |
2393 | ||
2394 | /* Now invoke the callbacks of any internal breakpoints there. */ | |
2395 | check_breakpoints (event_child->stop_pc); | |
2396 | ||
219f2f23 PA |
2397 | /* Handle tracepoint data collecting. This may overflow the |
2398 | trace buffer, and cause a tracing stop, removing | |
2399 | breakpoints. */ | |
2400 | trace_event = handle_tracepoints (event_child); | |
2401 | ||
6bf5e0ba PA |
2402 | if (bp_explains_trap) |
2403 | { | |
2404 | /* If we stepped or ran into an internal breakpoint, we've | |
2405 | already handled it. So next time we resume (from this | |
2406 | PC), we should step over it. */ | |
2407 | if (debug_threads) | |
2408 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2409 | ||
8b07ae33 PA |
2410 | if (breakpoint_here (event_child->stop_pc)) |
2411 | event_child->need_step_over = 1; | |
6bf5e0ba PA |
2412 | } |
2413 | } | |
2414 | else | |
2415 | { | |
2416 | /* We have some other signal, possibly a step-over dance was in | |
2417 | progress, and it should be cancelled too. */ | |
2418 | step_over_finished = finish_step_over (event_child); | |
fa593d66 PA |
2419 | } |
2420 | ||
2421 | /* We have all the data we need. Either report the event to GDB, or | |
2422 | resume threads and keep waiting for more. */ | |
2423 | ||
2424 | /* If we're collecting a fast tracepoint, finish the collection and | |
2425 | move out of the jump pad before delivering a signal. See | |
2426 | linux_stabilize_threads. */ | |
2427 | ||
2428 | if (WIFSTOPPED (w) | |
2429 | && WSTOPSIG (w) != SIGTRAP | |
2430 | && supports_fast_tracepoints () | |
58b4daa5 | 2431 | && agent_loaded_p ()) |
fa593d66 PA |
2432 | { |
2433 | if (debug_threads) | |
2434 | fprintf (stderr, | |
2435 | "Got signal %d for LWP %ld. Check if we need " | |
2436 | "to defer or adjust it.\n", | |
2437 | WSTOPSIG (w), lwpid_of (event_child)); | |
2438 | ||
2439 | /* Allow debugging the jump pad itself. */ | |
2440 | if (current_inferior->last_resume_kind != resume_step | |
2441 | && maybe_move_out_of_jump_pad (event_child, &w)) | |
2442 | { | |
2443 | enqueue_one_deferred_signal (event_child, &w); | |
2444 | ||
2445 | if (debug_threads) | |
2446 | fprintf (stderr, | |
2447 | "Signal %d for LWP %ld deferred (in jump pad)\n", | |
2448 | WSTOPSIG (w), lwpid_of (event_child)); | |
2449 | ||
2450 | linux_resume_one_lwp (event_child, 0, 0, NULL); | |
2451 | goto retry; | |
2452 | } | |
2453 | } | |
219f2f23 | 2454 | |
fa593d66 PA |
2455 | if (event_child->collecting_fast_tracepoint) |
2456 | { | |
2457 | if (debug_threads) | |
2458 | fprintf (stderr, "\ | |
2459 | LWP %ld was trying to move out of the jump pad (%d). \ | |
2460 | Check if we're already there.\n", | |
2461 | lwpid_of (event_child), | |
2462 | event_child->collecting_fast_tracepoint); | |
2463 | ||
2464 | trace_event = 1; | |
2465 | ||
2466 | event_child->collecting_fast_tracepoint | |
2467 | = linux_fast_tracepoint_collecting (event_child, NULL); | |
2468 | ||
2469 | if (event_child->collecting_fast_tracepoint != 1) | |
2470 | { | |
2471 | /* No longer need this breakpoint. */ | |
2472 | if (event_child->exit_jump_pad_bkpt != NULL) | |
2473 | { | |
2474 | if (debug_threads) | |
2475 | fprintf (stderr, | |
2476 | "No longer need exit-jump-pad bkpt; removing it." | |
2477 | "stopping all threads momentarily.\n"); | |
2478 | ||
2479 | /* Other running threads could hit this breakpoint. | |
2480 | We don't handle moribund locations like GDB does, | |
2481 | instead we always pause all threads when removing | |
2482 | breakpoints, so that any step-over or | |
2483 | decr_pc_after_break adjustment is always taken | |
2484 | care of while the breakpoint is still | |
2485 | inserted. */ | |
2486 | stop_all_lwps (1, event_child); | |
2487 | cancel_breakpoints (); | |
2488 | ||
2489 | delete_breakpoint (event_child->exit_jump_pad_bkpt); | |
2490 | event_child->exit_jump_pad_bkpt = NULL; | |
2491 | ||
2492 | unstop_all_lwps (1, event_child); | |
2493 | ||
2494 | gdb_assert (event_child->suspended >= 0); | |
2495 | } | |
2496 | } | |
2497 | ||
2498 | if (event_child->collecting_fast_tracepoint == 0) | |
2499 | { | |
2500 | if (debug_threads) | |
2501 | fprintf (stderr, | |
2502 | "fast tracepoint finished " | |
2503 | "collecting successfully.\n"); | |
2504 | ||
2505 | /* We may have a deferred signal to report. */ | |
2506 | if (dequeue_one_deferred_signal (event_child, &w)) | |
2507 | { | |
2508 | if (debug_threads) | |
2509 | fprintf (stderr, "dequeued one signal.\n"); | |
2510 | } | |
3c11dd79 | 2511 | else |
fa593d66 | 2512 | { |
3c11dd79 PA |
2513 | if (debug_threads) |
2514 | fprintf (stderr, "no deferred signals.\n"); | |
fa593d66 PA |
2515 | |
2516 | if (stabilizing_threads) | |
2517 | { | |
2518 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
a493e3e2 | 2519 | ourstatus->value.sig = GDB_SIGNAL_0; |
fa593d66 PA |
2520 | return ptid_of (event_child); |
2521 | } | |
2522 | } | |
2523 | } | |
6bf5e0ba PA |
2524 | } |
2525 | ||
e471f25b PA |
2526 | /* Check whether GDB would be interested in this event. */ |
2527 | ||
2528 | /* If GDB is not interested in this signal, don't stop other | |
2529 | threads, and don't report it to GDB. Just resume the inferior | |
2530 | right away. We do this for threading-related signals as well as | |
2531 | any that GDB specifically requested we ignore. But never ignore | |
2532 | SIGSTOP if we sent it ourselves, and do not ignore signals when | |
2533 | stepping - they may require special handling to skip the signal | |
2534 | handler. */ | |
2535 | /* FIXME drow/2002-06-09: Get signal numbers from the inferior's | |
2536 | thread library? */ | |
2537 | if (WIFSTOPPED (w) | |
2538 | && current_inferior->last_resume_kind != resume_step | |
2539 | && ( | |
1a981360 | 2540 | #if defined (USE_THREAD_DB) && !defined (__ANDROID__) |
e471f25b PA |
2541 | (current_process ()->private->thread_db != NULL |
2542 | && (WSTOPSIG (w) == __SIGRTMIN | |
2543 | || WSTOPSIG (w) == __SIGRTMIN + 1)) | |
2544 | || | |
2545 | #endif | |
2ea28649 | 2546 | (pass_signals[gdb_signal_from_host (WSTOPSIG (w))] |
e471f25b PA |
2547 | && !(WSTOPSIG (w) == SIGSTOP |
2548 | && current_inferior->last_resume_kind == resume_stop)))) | |
2549 | { | |
2550 | siginfo_t info, *info_p; | |
2551 | ||
2552 | if (debug_threads) | |
2553 | fprintf (stderr, "Ignored signal %d for LWP %ld.\n", | |
2554 | WSTOPSIG (w), lwpid_of (event_child)); | |
2555 | ||
56f7af9c | 2556 | if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), |
b8e1b30e | 2557 | (PTRACE_TYPE_ARG3) 0, &info) == 0) |
e471f25b PA |
2558 | info_p = &info; |
2559 | else | |
2560 | info_p = NULL; | |
2561 | linux_resume_one_lwp (event_child, event_child->stepping, | |
2562 | WSTOPSIG (w), info_p); | |
2563 | goto retry; | |
2564 | } | |
2565 | ||
c2d6af84 PA |
2566 | /* Note that all addresses are always "out of the step range" when |
2567 | there's no range to begin with. */ | |
2568 | in_step_range = lwp_in_step_range (event_child); | |
2569 | ||
2570 | /* If GDB wanted this thread to single step, and the thread is out | |
2571 | of the step range, we always want to report the SIGTRAP, and let | |
2572 | GDB handle it. Watchpoints should always be reported. So should | |
2573 | signals we can't explain. A SIGTRAP we can't explain could be a | |
2574 | GDB breakpoint --- we may or not support Z0 breakpoints. If we | |
2575 | do, we're be able to handle GDB breakpoints on top of internal | |
2576 | breakpoints, by handling the internal breakpoint and still | |
2577 | reporting the event to GDB. If we don't, we're out of luck, GDB | |
2578 | won't see the breakpoint hit. */ | |
6bf5e0ba | 2579 | report_to_gdb = (!maybe_internal_trap |
c2d6af84 PA |
2580 | || (current_inferior->last_resume_kind == resume_step |
2581 | && !in_step_range) | |
6bf5e0ba | 2582 | || event_child->stopped_by_watchpoint |
c2d6af84 | 2583 | || (!step_over_finished && !in_step_range |
493e2a69 | 2584 | && !bp_explains_trap && !trace_event) |
9f3a5c85 | 2585 | || (gdb_breakpoint_here (event_child->stop_pc) |
d3ce09f5 SS |
2586 | && gdb_condition_true_at_breakpoint (event_child->stop_pc) |
2587 | && gdb_no_commands_at_breakpoint (event_child->stop_pc))); | |
2588 | ||
2589 | run_breakpoint_commands (event_child->stop_pc); | |
6bf5e0ba PA |
2590 | |
2591 | /* We found no reason GDB would want us to stop. We either hit one | |
2592 | of our own breakpoints, or finished an internal step GDB | |
2593 | shouldn't know about. */ | |
2594 | if (!report_to_gdb) | |
2595 | { | |
2596 | if (debug_threads) | |
2597 | { | |
2598 | if (bp_explains_trap) | |
2599 | fprintf (stderr, "Hit a gdbserver breakpoint.\n"); | |
2600 | if (step_over_finished) | |
2601 | fprintf (stderr, "Step-over finished.\n"); | |
219f2f23 PA |
2602 | if (trace_event) |
2603 | fprintf (stderr, "Tracepoint event.\n"); | |
c2d6af84 PA |
2604 | if (lwp_in_step_range (event_child)) |
2605 | fprintf (stderr, "Range stepping pc 0x%s [0x%s, 0x%s).\n", | |
2606 | paddress (event_child->stop_pc), | |
2607 | paddress (event_child->step_range_start), | |
2608 | paddress (event_child->step_range_end)); | |
6bf5e0ba PA |
2609 | } |
2610 | ||
2611 | /* We're not reporting this breakpoint to GDB, so apply the | |
2612 | decr_pc_after_break adjustment to the inferior's regcache | |
2613 | ourselves. */ | |
2614 | ||
2615 | if (the_low_target.set_pc != NULL) | |
2616 | { | |
2617 | struct regcache *regcache | |
2618 | = get_thread_regcache (get_lwp_thread (event_child), 1); | |
2619 | (*the_low_target.set_pc) (regcache, event_child->stop_pc); | |
2620 | } | |
2621 | ||
7984d532 PA |
2622 | /* We may have finished stepping over a breakpoint. If so, |
2623 | we've stopped and suspended all LWPs momentarily except the | |
2624 | stepping one. This is where we resume them all again. We're | |
2625 | going to keep waiting, so use proceed, which handles stepping | |
2626 | over the next breakpoint. */ | |
6bf5e0ba PA |
2627 | if (debug_threads) |
2628 | fprintf (stderr, "proceeding all threads.\n"); | |
7984d532 PA |
2629 | |
2630 | if (step_over_finished) | |
2631 | unsuspend_all_lwps (event_child); | |
2632 | ||
6bf5e0ba PA |
2633 | proceed_all_lwps (); |
2634 | goto retry; | |
2635 | } | |
2636 | ||
2637 | if (debug_threads) | |
2638 | { | |
8336d594 | 2639 | if (current_inferior->last_resume_kind == resume_step) |
c2d6af84 PA |
2640 | { |
2641 | if (event_child->step_range_start == event_child->step_range_end) | |
2642 | fprintf (stderr, "GDB wanted to single-step, reporting event.\n"); | |
2643 | else if (!lwp_in_step_range (event_child)) | |
2644 | fprintf (stderr, "Out of step range, reporting event.\n"); | |
2645 | } | |
6bf5e0ba PA |
2646 | if (event_child->stopped_by_watchpoint) |
2647 | fprintf (stderr, "Stopped by watchpoint.\n"); | |
8b07ae33 PA |
2648 | if (gdb_breakpoint_here (event_child->stop_pc)) |
2649 | fprintf (stderr, "Stopped by GDB breakpoint.\n"); | |
6bf5e0ba PA |
2650 | if (debug_threads) |
2651 | fprintf (stderr, "Hit a non-gdbserver trap event.\n"); | |
2652 | } | |
2653 | ||
2654 | /* Alright, we're going to report a stop. */ | |
2655 | ||
fa593d66 | 2656 | if (!non_stop && !stabilizing_threads) |
6bf5e0ba PA |
2657 | { |
2658 | /* In all-stop, stop all threads. */ | |
7984d532 | 2659 | stop_all_lwps (0, NULL); |
6bf5e0ba PA |
2660 | |
2661 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2662 | from among those that have had events. Giving equal priority | |
2663 | to all LWPs that have had events helps prevent | |
2664 | starvation. */ | |
2665 | if (ptid_equal (ptid, minus_one_ptid)) | |
2666 | { | |
2667 | event_child->status_pending_p = 1; | |
2668 | event_child->status_pending = w; | |
2669 | ||
2670 | select_event_lwp (&event_child); | |
2671 | ||
2672 | event_child->status_pending_p = 0; | |
2673 | w = event_child->status_pending; | |
2674 | } | |
2675 | ||
2676 | /* Now that we've selected our final event LWP, cancel any | |
2677 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
2678 | See the comment in cancel_breakpoints_callback to find out | |
2679 | why. */ | |
2680 | find_inferior (&all_lwps, cancel_breakpoints_callback, event_child); | |
fa593d66 | 2681 | |
c03e6ccc YQ |
2682 | /* If we were going a step-over, all other threads but the stepping one |
2683 | had been paused in start_step_over, with their suspend counts | |
2684 | incremented. We don't want to do a full unstop/unpause, because we're | |
2685 | in all-stop mode (so we want threads stopped), but we still need to | |
2686 | unsuspend the other threads, to decrement their `suspended' count | |
2687 | back. */ | |
2688 | if (step_over_finished) | |
2689 | unsuspend_all_lwps (event_child); | |
2690 | ||
fa593d66 PA |
2691 | /* Stabilize threads (move out of jump pads). */ |
2692 | stabilize_threads (); | |
6bf5e0ba PA |
2693 | } |
2694 | else | |
2695 | { | |
2696 | /* If we just finished a step-over, then all threads had been | |
2697 | momentarily paused. In all-stop, that's fine, we want | |
2698 | threads stopped by now anyway. In non-stop, we need to | |
2699 | re-resume threads that GDB wanted to be running. */ | |
2700 | if (step_over_finished) | |
7984d532 | 2701 | unstop_all_lwps (1, event_child); |
6bf5e0ba PA |
2702 | } |
2703 | ||
5b1c542e | 2704 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
5b1c542e | 2705 | |
8336d594 PA |
2706 | if (current_inferior->last_resume_kind == resume_stop |
2707 | && WSTOPSIG (w) == SIGSTOP) | |
bd99dc85 PA |
2708 | { |
2709 | /* A thread that has been requested to stop by GDB with vCont;t, | |
2710 | and it stopped cleanly, so report as SIG0. The use of | |
2711 | SIGSTOP is an implementation detail. */ | |
a493e3e2 | 2712 | ourstatus->value.sig = GDB_SIGNAL_0; |
bd99dc85 | 2713 | } |
8336d594 PA |
2714 | else if (current_inferior->last_resume_kind == resume_stop |
2715 | && WSTOPSIG (w) != SIGSTOP) | |
bd99dc85 PA |
2716 | { |
2717 | /* A thread that has been requested to stop by GDB with vCont;t, | |
d50171e4 | 2718 | but, it stopped for other reasons. */ |
2ea28649 | 2719 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2720 | } |
2721 | else | |
2722 | { | |
2ea28649 | 2723 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (w)); |
bd99dc85 PA |
2724 | } |
2725 | ||
d50171e4 PA |
2726 | gdb_assert (ptid_equal (step_over_bkpt, null_ptid)); |
2727 | ||
bd99dc85 | 2728 | if (debug_threads) |
95954743 | 2729 | fprintf (stderr, "linux_wait ret = %s, %d, %d\n", |
6bf5e0ba | 2730 | target_pid_to_str (ptid_of (event_child)), |
bd99dc85 PA |
2731 | ourstatus->kind, |
2732 | ourstatus->value.sig); | |
2733 | ||
6bf5e0ba | 2734 | return ptid_of (event_child); |
bd99dc85 PA |
2735 | } |
2736 | ||
2737 | /* Get rid of any pending event in the pipe. */ | |
2738 | static void | |
2739 | async_file_flush (void) | |
2740 | { | |
2741 | int ret; | |
2742 | char buf; | |
2743 | ||
2744 | do | |
2745 | ret = read (linux_event_pipe[0], &buf, 1); | |
2746 | while (ret >= 0 || (ret == -1 && errno == EINTR)); | |
2747 | } | |
2748 | ||
2749 | /* Put something in the pipe, so the event loop wakes up. */ | |
2750 | static void | |
2751 | async_file_mark (void) | |
2752 | { | |
2753 | int ret; | |
2754 | ||
2755 | async_file_flush (); | |
2756 | ||
2757 | do | |
2758 | ret = write (linux_event_pipe[1], "+", 1); | |
2759 | while (ret == 0 || (ret == -1 && errno == EINTR)); | |
2760 | ||
2761 | /* Ignore EAGAIN. If the pipe is full, the event loop will already | |
2762 | be awakened anyway. */ | |
2763 | } | |
2764 | ||
95954743 PA |
2765 | static ptid_t |
2766 | linux_wait (ptid_t ptid, | |
2767 | struct target_waitstatus *ourstatus, int target_options) | |
bd99dc85 | 2768 | { |
95954743 | 2769 | ptid_t event_ptid; |
bd99dc85 PA |
2770 | |
2771 | if (debug_threads) | |
95954743 | 2772 | fprintf (stderr, "linux_wait: [%s]\n", target_pid_to_str (ptid)); |
bd99dc85 PA |
2773 | |
2774 | /* Flush the async file first. */ | |
2775 | if (target_is_async_p ()) | |
2776 | async_file_flush (); | |
2777 | ||
95954743 | 2778 | event_ptid = linux_wait_1 (ptid, ourstatus, target_options); |
bd99dc85 PA |
2779 | |
2780 | /* If at least one stop was reported, there may be more. A single | |
2781 | SIGCHLD can signal more than one child stop. */ | |
2782 | if (target_is_async_p () | |
2783 | && (target_options & TARGET_WNOHANG) != 0 | |
95954743 | 2784 | && !ptid_equal (event_ptid, null_ptid)) |
bd99dc85 PA |
2785 | async_file_mark (); |
2786 | ||
2787 | return event_ptid; | |
da6d8c04 DJ |
2788 | } |
2789 | ||
c5f62d5f | 2790 | /* Send a signal to an LWP. */ |
fd500816 DJ |
2791 | |
2792 | static int | |
a1928bad | 2793 | kill_lwp (unsigned long lwpid, int signo) |
fd500816 | 2794 | { |
c5f62d5f DE |
2795 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2796 | fails, then we are not using nptl threads and we should be using kill. */ | |
fd500816 | 2797 | |
c5f62d5f DE |
2798 | #ifdef __NR_tkill |
2799 | { | |
2800 | static int tkill_failed; | |
fd500816 | 2801 | |
c5f62d5f DE |
2802 | if (!tkill_failed) |
2803 | { | |
2804 | int ret; | |
2805 | ||
2806 | errno = 0; | |
2807 | ret = syscall (__NR_tkill, lwpid, signo); | |
2808 | if (errno != ENOSYS) | |
2809 | return ret; | |
2810 | tkill_failed = 1; | |
2811 | } | |
2812 | } | |
fd500816 DJ |
2813 | #endif |
2814 | ||
2815 | return kill (lwpid, signo); | |
2816 | } | |
2817 | ||
964e4306 PA |
2818 | void |
2819 | linux_stop_lwp (struct lwp_info *lwp) | |
2820 | { | |
2821 | send_sigstop (lwp); | |
2822 | } | |
2823 | ||
0d62e5e8 | 2824 | static void |
02fc4de7 | 2825 | send_sigstop (struct lwp_info *lwp) |
0d62e5e8 | 2826 | { |
bd99dc85 | 2827 | int pid; |
0d62e5e8 | 2828 | |
bd99dc85 PA |
2829 | pid = lwpid_of (lwp); |
2830 | ||
0d62e5e8 DJ |
2831 | /* If we already have a pending stop signal for this process, don't |
2832 | send another. */ | |
54a0b537 | 2833 | if (lwp->stop_expected) |
0d62e5e8 | 2834 | { |
ae13219e | 2835 | if (debug_threads) |
bd99dc85 | 2836 | fprintf (stderr, "Have pending sigstop for lwp %d\n", pid); |
ae13219e | 2837 | |
0d62e5e8 DJ |
2838 | return; |
2839 | } | |
2840 | ||
2841 | if (debug_threads) | |
bd99dc85 | 2842 | fprintf (stderr, "Sending sigstop to lwp %d\n", pid); |
0d62e5e8 | 2843 | |
d50171e4 | 2844 | lwp->stop_expected = 1; |
bd99dc85 | 2845 | kill_lwp (pid, SIGSTOP); |
0d62e5e8 DJ |
2846 | } |
2847 | ||
7984d532 PA |
2848 | static int |
2849 | send_sigstop_callback (struct inferior_list_entry *entry, void *except) | |
02fc4de7 PA |
2850 | { |
2851 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2852 | ||
7984d532 PA |
2853 | /* Ignore EXCEPT. */ |
2854 | if (lwp == except) | |
2855 | return 0; | |
2856 | ||
02fc4de7 | 2857 | if (lwp->stopped) |
7984d532 | 2858 | return 0; |
02fc4de7 PA |
2859 | |
2860 | send_sigstop (lwp); | |
7984d532 PA |
2861 | return 0; |
2862 | } | |
2863 | ||
2864 | /* Increment the suspend count of an LWP, and stop it, if not stopped | |
2865 | yet. */ | |
2866 | static int | |
2867 | suspend_and_send_sigstop_callback (struct inferior_list_entry *entry, | |
2868 | void *except) | |
2869 | { | |
2870 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2871 | ||
2872 | /* Ignore EXCEPT. */ | |
2873 | if (lwp == except) | |
2874 | return 0; | |
2875 | ||
2876 | lwp->suspended++; | |
2877 | ||
2878 | return send_sigstop_callback (entry, except); | |
02fc4de7 PA |
2879 | } |
2880 | ||
95954743 PA |
2881 | static void |
2882 | mark_lwp_dead (struct lwp_info *lwp, int wstat) | |
2883 | { | |
2884 | /* It's dead, really. */ | |
2885 | lwp->dead = 1; | |
2886 | ||
2887 | /* Store the exit status for later. */ | |
2888 | lwp->status_pending_p = 1; | |
2889 | lwp->status_pending = wstat; | |
2890 | ||
95954743 PA |
2891 | /* Prevent trying to stop it. */ |
2892 | lwp->stopped = 1; | |
2893 | ||
2894 | /* No further stops are expected from a dead lwp. */ | |
2895 | lwp->stop_expected = 0; | |
2896 | } | |
2897 | ||
0d62e5e8 DJ |
2898 | static void |
2899 | wait_for_sigstop (struct inferior_list_entry *entry) | |
2900 | { | |
54a0b537 | 2901 | struct lwp_info *lwp = (struct lwp_info *) entry; |
bd99dc85 | 2902 | struct thread_info *saved_inferior; |
a1928bad | 2903 | int wstat; |
95954743 PA |
2904 | ptid_t saved_tid; |
2905 | ptid_t ptid; | |
d50171e4 | 2906 | int pid; |
0d62e5e8 | 2907 | |
54a0b537 | 2908 | if (lwp->stopped) |
d50171e4 PA |
2909 | { |
2910 | if (debug_threads) | |
2911 | fprintf (stderr, "wait_for_sigstop: LWP %ld already stopped\n", | |
2912 | lwpid_of (lwp)); | |
2913 | return; | |
2914 | } | |
0d62e5e8 DJ |
2915 | |
2916 | saved_inferior = current_inferior; | |
bd99dc85 PA |
2917 | if (saved_inferior != NULL) |
2918 | saved_tid = ((struct inferior_list_entry *) saved_inferior)->id; | |
2919 | else | |
95954743 | 2920 | saved_tid = null_ptid; /* avoid bogus unused warning */ |
bd99dc85 | 2921 | |
95954743 | 2922 | ptid = lwp->head.id; |
bd99dc85 | 2923 | |
d50171e4 PA |
2924 | if (debug_threads) |
2925 | fprintf (stderr, "wait_for_sigstop: pulling one event\n"); | |
2926 | ||
2927 | pid = linux_wait_for_event (ptid, &wstat, __WALL); | |
0d62e5e8 DJ |
2928 | |
2929 | /* If we stopped with a non-SIGSTOP signal, save it for later | |
2930 | and record the pending SIGSTOP. If the process exited, just | |
2931 | return. */ | |
d50171e4 | 2932 | if (WIFSTOPPED (wstat)) |
0d62e5e8 DJ |
2933 | { |
2934 | if (debug_threads) | |
d50171e4 PA |
2935 | fprintf (stderr, "LWP %ld stopped with signal %d\n", |
2936 | lwpid_of (lwp), WSTOPSIG (wstat)); | |
c35fafde | 2937 | |
d50171e4 | 2938 | if (WSTOPSIG (wstat) != SIGSTOP) |
c35fafde PA |
2939 | { |
2940 | if (debug_threads) | |
d50171e4 PA |
2941 | fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n", |
2942 | lwpid_of (lwp), wstat); | |
2943 | ||
c35fafde PA |
2944 | lwp->status_pending_p = 1; |
2945 | lwp->status_pending = wstat; | |
2946 | } | |
0d62e5e8 | 2947 | } |
d50171e4 | 2948 | else |
95954743 PA |
2949 | { |
2950 | if (debug_threads) | |
d50171e4 | 2951 | fprintf (stderr, "Process %d exited while stopping LWPs\n", pid); |
95954743 | 2952 | |
d50171e4 PA |
2953 | lwp = find_lwp_pid (pid_to_ptid (pid)); |
2954 | if (lwp) | |
2955 | { | |
2956 | /* Leave this status pending for the next time we're able to | |
2957 | report it. In the mean time, we'll report this lwp as | |
2958 | dead to GDB, so GDB doesn't try to read registers and | |
2959 | memory from it. This can only happen if this was the | |
2960 | last thread of the process; otherwise, PID is removed | |
2961 | from the thread tables before linux_wait_for_event | |
2962 | returns. */ | |
2963 | mark_lwp_dead (lwp, wstat); | |
2964 | } | |
95954743 | 2965 | } |
0d62e5e8 | 2966 | |
bd99dc85 | 2967 | if (saved_inferior == NULL || linux_thread_alive (saved_tid)) |
0d62e5e8 DJ |
2968 | current_inferior = saved_inferior; |
2969 | else | |
2970 | { | |
2971 | if (debug_threads) | |
2972 | fprintf (stderr, "Previously current thread died.\n"); | |
2973 | ||
bd99dc85 PA |
2974 | if (non_stop) |
2975 | { | |
2976 | /* We can't change the current inferior behind GDB's back, | |
2977 | otherwise, a subsequent command may apply to the wrong | |
2978 | process. */ | |
2979 | current_inferior = NULL; | |
2980 | } | |
2981 | else | |
2982 | { | |
2983 | /* Set a valid thread as current. */ | |
2984 | set_desired_inferior (0); | |
2985 | } | |
0d62e5e8 DJ |
2986 | } |
2987 | } | |
2988 | ||
fa593d66 PA |
2989 | /* Returns true if LWP ENTRY is stopped in a jump pad, and we can't |
2990 | move it out, because we need to report the stop event to GDB. For | |
2991 | example, if the user puts a breakpoint in the jump pad, it's | |
2992 | because she wants to debug it. */ | |
2993 | ||
2994 | static int | |
2995 | stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data) | |
2996 | { | |
2997 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
2998 | struct thread_info *thread = get_lwp_thread (lwp); | |
2999 | ||
3000 | gdb_assert (lwp->suspended == 0); | |
3001 | gdb_assert (lwp->stopped); | |
3002 | ||
3003 | /* Allow debugging the jump pad, gdb_collect, etc.. */ | |
3004 | return (supports_fast_tracepoints () | |
58b4daa5 | 3005 | && agent_loaded_p () |
fa593d66 PA |
3006 | && (gdb_breakpoint_here (lwp->stop_pc) |
3007 | || lwp->stopped_by_watchpoint | |
3008 | || thread->last_resume_kind == resume_step) | |
3009 | && linux_fast_tracepoint_collecting (lwp, NULL)); | |
3010 | } | |
3011 | ||
3012 | static void | |
3013 | move_out_of_jump_pad_callback (struct inferior_list_entry *entry) | |
3014 | { | |
3015 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3016 | struct thread_info *thread = get_lwp_thread (lwp); | |
3017 | int *wstat; | |
3018 | ||
3019 | gdb_assert (lwp->suspended == 0); | |
3020 | gdb_assert (lwp->stopped); | |
3021 | ||
3022 | wstat = lwp->status_pending_p ? &lwp->status_pending : NULL; | |
3023 | ||
3024 | /* Allow debugging the jump pad, gdb_collect, etc. */ | |
3025 | if (!gdb_breakpoint_here (lwp->stop_pc) | |
3026 | && !lwp->stopped_by_watchpoint | |
3027 | && thread->last_resume_kind != resume_step | |
3028 | && maybe_move_out_of_jump_pad (lwp, wstat)) | |
3029 | { | |
3030 | if (debug_threads) | |
3031 | fprintf (stderr, | |
3032 | "LWP %ld needs stabilizing (in jump pad)\n", | |
3033 | lwpid_of (lwp)); | |
3034 | ||
3035 | if (wstat) | |
3036 | { | |
3037 | lwp->status_pending_p = 0; | |
3038 | enqueue_one_deferred_signal (lwp, wstat); | |
3039 | ||
3040 | if (debug_threads) | |
3041 | fprintf (stderr, | |
3042 | "Signal %d for LWP %ld deferred " | |
3043 | "(in jump pad)\n", | |
3044 | WSTOPSIG (*wstat), lwpid_of (lwp)); | |
3045 | } | |
3046 | ||
3047 | linux_resume_one_lwp (lwp, 0, 0, NULL); | |
3048 | } | |
3049 | else | |
3050 | lwp->suspended++; | |
3051 | } | |
3052 | ||
3053 | static int | |
3054 | lwp_running (struct inferior_list_entry *entry, void *data) | |
3055 | { | |
3056 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3057 | ||
3058 | if (lwp->dead) | |
3059 | return 0; | |
3060 | if (lwp->stopped) | |
3061 | return 0; | |
3062 | return 1; | |
3063 | } | |
3064 | ||
7984d532 PA |
3065 | /* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL. |
3066 | If SUSPEND, then also increase the suspend count of every LWP, | |
3067 | except EXCEPT. */ | |
3068 | ||
0d62e5e8 | 3069 | static void |
7984d532 | 3070 | stop_all_lwps (int suspend, struct lwp_info *except) |
0d62e5e8 | 3071 | { |
bde24c0a PA |
3072 | /* Should not be called recursively. */ |
3073 | gdb_assert (stopping_threads == NOT_STOPPING_THREADS); | |
3074 | ||
3075 | stopping_threads = (suspend | |
3076 | ? STOPPING_AND_SUSPENDING_THREADS | |
3077 | : STOPPING_THREADS); | |
7984d532 PA |
3078 | |
3079 | if (suspend) | |
3080 | find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except); | |
3081 | else | |
3082 | find_inferior (&all_lwps, send_sigstop_callback, except); | |
54a0b537 | 3083 | for_each_inferior (&all_lwps, wait_for_sigstop); |
bde24c0a | 3084 | stopping_threads = NOT_STOPPING_THREADS; |
0d62e5e8 DJ |
3085 | } |
3086 | ||
da6d8c04 DJ |
3087 | /* Resume execution of the inferior process. |
3088 | If STEP is nonzero, single-step it. | |
3089 | If SIGNAL is nonzero, give it that signal. */ | |
3090 | ||
ce3a066d | 3091 | static void |
2acc282a | 3092 | linux_resume_one_lwp (struct lwp_info *lwp, |
54a0b537 | 3093 | int step, int signal, siginfo_t *info) |
da6d8c04 | 3094 | { |
0d62e5e8 | 3095 | struct thread_info *saved_inferior; |
fa593d66 | 3096 | int fast_tp_collecting; |
0d62e5e8 | 3097 | |
54a0b537 | 3098 | if (lwp->stopped == 0) |
0d62e5e8 DJ |
3099 | return; |
3100 | ||
fa593d66 PA |
3101 | fast_tp_collecting = lwp->collecting_fast_tracepoint; |
3102 | ||
3103 | gdb_assert (!stabilizing_threads || fast_tp_collecting); | |
3104 | ||
219f2f23 PA |
3105 | /* Cancel actions that rely on GDB not changing the PC (e.g., the |
3106 | user used the "jump" command, or "set $pc = foo"). */ | |
3107 | if (lwp->stop_pc != get_pc (lwp)) | |
3108 | { | |
3109 | /* Collecting 'while-stepping' actions doesn't make sense | |
3110 | anymore. */ | |
3111 | release_while_stepping_state_list (get_lwp_thread (lwp)); | |
3112 | } | |
3113 | ||
0d62e5e8 DJ |
3114 | /* If we have pending signals or status, and a new signal, enqueue the |
3115 | signal. Also enqueue the signal if we are waiting to reinsert a | |
3116 | breakpoint; it will be picked up again below. */ | |
3117 | if (signal != 0 | |
fa593d66 PA |
3118 | && (lwp->status_pending_p |
3119 | || lwp->pending_signals != NULL | |
3120 | || lwp->bp_reinsert != 0 | |
3121 | || fast_tp_collecting)) | |
0d62e5e8 DJ |
3122 | { |
3123 | struct pending_signals *p_sig; | |
bca929d3 | 3124 | p_sig = xmalloc (sizeof (*p_sig)); |
54a0b537 | 3125 | p_sig->prev = lwp->pending_signals; |
0d62e5e8 | 3126 | p_sig->signal = signal; |
32ca6d61 DJ |
3127 | if (info == NULL) |
3128 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3129 | else | |
3130 | memcpy (&p_sig->info, info, sizeof (siginfo_t)); | |
54a0b537 | 3131 | lwp->pending_signals = p_sig; |
0d62e5e8 DJ |
3132 | } |
3133 | ||
d50171e4 PA |
3134 | if (lwp->status_pending_p) |
3135 | { | |
3136 | if (debug_threads) | |
3137 | fprintf (stderr, "Not resuming lwp %ld (%s, signal %d, stop %s);" | |
3138 | " has pending status\n", | |
3139 | lwpid_of (lwp), step ? "step" : "continue", signal, | |
3140 | lwp->stop_expected ? "expected" : "not expected"); | |
3141 | return; | |
3142 | } | |
0d62e5e8 DJ |
3143 | |
3144 | saved_inferior = current_inferior; | |
54a0b537 | 3145 | current_inferior = get_lwp_thread (lwp); |
0d62e5e8 DJ |
3146 | |
3147 | if (debug_threads) | |
1b3f6016 | 3148 | fprintf (stderr, "Resuming lwp %ld (%s, signal %d, stop %s)\n", |
bd99dc85 | 3149 | lwpid_of (lwp), step ? "step" : "continue", signal, |
54a0b537 | 3150 | lwp->stop_expected ? "expected" : "not expected"); |
0d62e5e8 DJ |
3151 | |
3152 | /* This bit needs some thinking about. If we get a signal that | |
3153 | we must report while a single-step reinsert is still pending, | |
3154 | we often end up resuming the thread. It might be better to | |
3155 | (ew) allow a stack of pending events; then we could be sure that | |
3156 | the reinsert happened right away and not lose any signals. | |
3157 | ||
3158 | Making this stack would also shrink the window in which breakpoints are | |
54a0b537 | 3159 | uninserted (see comment in linux_wait_for_lwp) but not enough for |
0d62e5e8 DJ |
3160 | complete correctness, so it won't solve that problem. It may be |
3161 | worthwhile just to solve this one, however. */ | |
54a0b537 | 3162 | if (lwp->bp_reinsert != 0) |
0d62e5e8 DJ |
3163 | { |
3164 | if (debug_threads) | |
d50171e4 PA |
3165 | fprintf (stderr, " pending reinsert at 0x%s\n", |
3166 | paddress (lwp->bp_reinsert)); | |
3167 | ||
85e00e85 | 3168 | if (can_hardware_single_step ()) |
d50171e4 | 3169 | { |
fa593d66 PA |
3170 | if (fast_tp_collecting == 0) |
3171 | { | |
3172 | if (step == 0) | |
3173 | fprintf (stderr, "BAD - reinserting but not stepping.\n"); | |
3174 | if (lwp->suspended) | |
3175 | fprintf (stderr, "BAD - reinserting and suspended(%d).\n", | |
3176 | lwp->suspended); | |
3177 | } | |
d50171e4 PA |
3178 | |
3179 | step = 1; | |
3180 | } | |
0d62e5e8 DJ |
3181 | |
3182 | /* Postpone any pending signal. It was enqueued above. */ | |
3183 | signal = 0; | |
3184 | } | |
3185 | ||
fa593d66 PA |
3186 | if (fast_tp_collecting == 1) |
3187 | { | |
3188 | if (debug_threads) | |
3189 | fprintf (stderr, "\ | |
3190 | lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n", | |
3191 | lwpid_of (lwp)); | |
3192 | ||
3193 | /* Postpone any pending signal. It was enqueued above. */ | |
3194 | signal = 0; | |
3195 | } | |
3196 | else if (fast_tp_collecting == 2) | |
3197 | { | |
3198 | if (debug_threads) | |
3199 | fprintf (stderr, "\ | |
3200 | lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n", | |
3201 | lwpid_of (lwp)); | |
3202 | ||
3203 | if (can_hardware_single_step ()) | |
3204 | step = 1; | |
3205 | else | |
3206 | fatal ("moving out of jump pad single-stepping" | |
3207 | " not implemented on this target"); | |
3208 | ||
3209 | /* Postpone any pending signal. It was enqueued above. */ | |
3210 | signal = 0; | |
3211 | } | |
3212 | ||
219f2f23 PA |
3213 | /* If we have while-stepping actions in this thread set it stepping. |
3214 | If we have a signal to deliver, it may or may not be set to | |
3215 | SIG_IGN, we don't know. Assume so, and allow collecting | |
3216 | while-stepping into a signal handler. A possible smart thing to | |
3217 | do would be to set an internal breakpoint at the signal return | |
3218 | address, continue, and carry on catching this while-stepping | |
3219 | action only when that breakpoint is hit. A future | |
3220 | enhancement. */ | |
3221 | if (get_lwp_thread (lwp)->while_stepping != NULL | |
3222 | && can_hardware_single_step ()) | |
3223 | { | |
3224 | if (debug_threads) | |
3225 | fprintf (stderr, | |
3226 | "lwp %ld has a while-stepping action -> forcing step.\n", | |
3227 | lwpid_of (lwp)); | |
3228 | step = 1; | |
3229 | } | |
3230 | ||
aa691b87 | 3231 | if (debug_threads && the_low_target.get_pc != NULL) |
0d62e5e8 | 3232 | { |
442ea881 PA |
3233 | struct regcache *regcache = get_thread_regcache (current_inferior, 1); |
3234 | CORE_ADDR pc = (*the_low_target.get_pc) (regcache); | |
47c0c975 | 3235 | fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc); |
0d62e5e8 DJ |
3236 | } |
3237 | ||
fa593d66 PA |
3238 | /* If we have pending signals, consume one unless we are trying to |
3239 | reinsert a breakpoint or we're trying to finish a fast tracepoint | |
3240 | collect. */ | |
3241 | if (lwp->pending_signals != NULL | |
3242 | && lwp->bp_reinsert == 0 | |
3243 | && fast_tp_collecting == 0) | |
0d62e5e8 DJ |
3244 | { |
3245 | struct pending_signals **p_sig; | |
3246 | ||
54a0b537 | 3247 | p_sig = &lwp->pending_signals; |
0d62e5e8 DJ |
3248 | while ((*p_sig)->prev != NULL) |
3249 | p_sig = &(*p_sig)->prev; | |
3250 | ||
3251 | signal = (*p_sig)->signal; | |
32ca6d61 | 3252 | if ((*p_sig)->info.si_signo != 0) |
b8e1b30e | 3253 | ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3254 | &(*p_sig)->info); |
32ca6d61 | 3255 | |
0d62e5e8 DJ |
3256 | free (*p_sig); |
3257 | *p_sig = NULL; | |
3258 | } | |
3259 | ||
aa5ca48f DE |
3260 | if (the_low_target.prepare_to_resume != NULL) |
3261 | the_low_target.prepare_to_resume (lwp); | |
3262 | ||
3aee8918 | 3263 | regcache_invalidate_thread (get_lwp_thread (lwp)); |
da6d8c04 | 3264 | errno = 0; |
54a0b537 | 3265 | lwp->stopped = 0; |
c3adc08c | 3266 | lwp->stopped_by_watchpoint = 0; |
54a0b537 | 3267 | lwp->stepping = step; |
56f7af9c | 3268 | ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, lwpid_of (lwp), |
b8e1b30e | 3269 | (PTRACE_TYPE_ARG3) 0, |
14ce3065 DE |
3270 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
3271 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 3272 | (PTRACE_TYPE_ARG4) (uintptr_t) signal); |
0d62e5e8 DJ |
3273 | |
3274 | current_inferior = saved_inferior; | |
da6d8c04 | 3275 | if (errno) |
3221518c UW |
3276 | { |
3277 | /* ESRCH from ptrace either means that the thread was already | |
3278 | running (an error) or that it is gone (a race condition). If | |
3279 | it's gone, we will get a notification the next time we wait, | |
3280 | so we can ignore the error. We could differentiate these | |
3281 | two, but it's tricky without waiting; the thread still exists | |
3282 | as a zombie, so sending it signal 0 would succeed. So just | |
3283 | ignore ESRCH. */ | |
3284 | if (errno == ESRCH) | |
3285 | return; | |
3286 | ||
3287 | perror_with_name ("ptrace"); | |
3288 | } | |
da6d8c04 DJ |
3289 | } |
3290 | ||
2bd7c093 PA |
3291 | struct thread_resume_array |
3292 | { | |
3293 | struct thread_resume *resume; | |
3294 | size_t n; | |
3295 | }; | |
64386c31 DJ |
3296 | |
3297 | /* This function is called once per thread. We look up the thread | |
5544ad89 DJ |
3298 | in RESUME_PTR, and mark the thread with a pointer to the appropriate |
3299 | resume request. | |
3300 | ||
3301 | This algorithm is O(threads * resume elements), but resume elements | |
3302 | is small (and will remain small at least until GDB supports thread | |
3303 | suspension). */ | |
2bd7c093 PA |
3304 | static int |
3305 | linux_set_resume_request (struct inferior_list_entry *entry, void *arg) | |
0d62e5e8 | 3306 | { |
54a0b537 | 3307 | struct lwp_info *lwp; |
64386c31 | 3308 | struct thread_info *thread; |
5544ad89 | 3309 | int ndx; |
2bd7c093 | 3310 | struct thread_resume_array *r; |
64386c31 DJ |
3311 | |
3312 | thread = (struct thread_info *) entry; | |
54a0b537 | 3313 | lwp = get_thread_lwp (thread); |
2bd7c093 | 3314 | r = arg; |
64386c31 | 3315 | |
2bd7c093 | 3316 | for (ndx = 0; ndx < r->n; ndx++) |
95954743 PA |
3317 | { |
3318 | ptid_t ptid = r->resume[ndx].thread; | |
3319 | if (ptid_equal (ptid, minus_one_ptid) | |
3320 | || ptid_equal (ptid, entry->id) | |
0c9070b3 YQ |
3321 | /* Handle both 'pPID' and 'pPID.-1' as meaning 'all threads |
3322 | of PID'. */ | |
3323 | || (ptid_get_pid (ptid) == pid_of (lwp) | |
3324 | && (ptid_is_pid (ptid) | |
3325 | || ptid_get_lwp (ptid) == -1))) | |
95954743 | 3326 | { |
d50171e4 | 3327 | if (r->resume[ndx].kind == resume_stop |
8336d594 | 3328 | && thread->last_resume_kind == resume_stop) |
d50171e4 PA |
3329 | { |
3330 | if (debug_threads) | |
3331 | fprintf (stderr, "already %s LWP %ld at GDB's request\n", | |
3332 | thread->last_status.kind == TARGET_WAITKIND_STOPPED | |
3333 | ? "stopped" | |
3334 | : "stopping", | |
3335 | lwpid_of (lwp)); | |
3336 | ||
3337 | continue; | |
3338 | } | |
3339 | ||
95954743 | 3340 | lwp->resume = &r->resume[ndx]; |
8336d594 | 3341 | thread->last_resume_kind = lwp->resume->kind; |
fa593d66 | 3342 | |
c2d6af84 PA |
3343 | lwp->step_range_start = lwp->resume->step_range_start; |
3344 | lwp->step_range_end = lwp->resume->step_range_end; | |
3345 | ||
fa593d66 PA |
3346 | /* If we had a deferred signal to report, dequeue one now. |
3347 | This can happen if LWP gets more than one signal while | |
3348 | trying to get out of a jump pad. */ | |
3349 | if (lwp->stopped | |
3350 | && !lwp->status_pending_p | |
3351 | && dequeue_one_deferred_signal (lwp, &lwp->status_pending)) | |
3352 | { | |
3353 | lwp->status_pending_p = 1; | |
3354 | ||
3355 | if (debug_threads) | |
3356 | fprintf (stderr, | |
3357 | "Dequeueing deferred signal %d for LWP %ld, " | |
3358 | "leaving status pending.\n", | |
3359 | WSTOPSIG (lwp->status_pending), lwpid_of (lwp)); | |
3360 | } | |
3361 | ||
95954743 PA |
3362 | return 0; |
3363 | } | |
3364 | } | |
2bd7c093 PA |
3365 | |
3366 | /* No resume action for this thread. */ | |
3367 | lwp->resume = NULL; | |
64386c31 | 3368 | |
2bd7c093 | 3369 | return 0; |
5544ad89 DJ |
3370 | } |
3371 | ||
5544ad89 | 3372 | |
bd99dc85 PA |
3373 | /* Set *FLAG_P if this lwp has an interesting status pending. */ |
3374 | static int | |
3375 | resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p) | |
5544ad89 | 3376 | { |
bd99dc85 | 3377 | struct lwp_info *lwp = (struct lwp_info *) entry; |
5544ad89 | 3378 | |
bd99dc85 PA |
3379 | /* LWPs which will not be resumed are not interesting, because |
3380 | we might not wait for them next time through linux_wait. */ | |
2bd7c093 | 3381 | if (lwp->resume == NULL) |
bd99dc85 | 3382 | return 0; |
64386c31 | 3383 | |
bd99dc85 | 3384 | if (lwp->status_pending_p) |
d50171e4 PA |
3385 | * (int *) flag_p = 1; |
3386 | ||
3387 | return 0; | |
3388 | } | |
3389 | ||
3390 | /* Return 1 if this lwp that GDB wants running is stopped at an | |
3391 | internal breakpoint that we need to step over. It assumes that any | |
3392 | required STOP_PC adjustment has already been propagated to the | |
3393 | inferior's regcache. */ | |
3394 | ||
3395 | static int | |
3396 | need_step_over_p (struct inferior_list_entry *entry, void *dummy) | |
3397 | { | |
3398 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
8336d594 | 3399 | struct thread_info *thread; |
d50171e4 PA |
3400 | struct thread_info *saved_inferior; |
3401 | CORE_ADDR pc; | |
3402 | ||
3403 | /* LWPs which will not be resumed are not interesting, because we | |
3404 | might not wait for them next time through linux_wait. */ | |
3405 | ||
3406 | if (!lwp->stopped) | |
3407 | { | |
3408 | if (debug_threads) | |
3409 | fprintf (stderr, | |
3410 | "Need step over [LWP %ld]? Ignoring, not stopped\n", | |
3411 | lwpid_of (lwp)); | |
3412 | return 0; | |
3413 | } | |
3414 | ||
8336d594 PA |
3415 | thread = get_lwp_thread (lwp); |
3416 | ||
3417 | if (thread->last_resume_kind == resume_stop) | |
d50171e4 PA |
3418 | { |
3419 | if (debug_threads) | |
3420 | fprintf (stderr, | |
3421 | "Need step over [LWP %ld]? Ignoring, should remain stopped\n", | |
3422 | lwpid_of (lwp)); | |
3423 | return 0; | |
3424 | } | |
3425 | ||
7984d532 PA |
3426 | gdb_assert (lwp->suspended >= 0); |
3427 | ||
3428 | if (lwp->suspended) | |
3429 | { | |
3430 | if (debug_threads) | |
3431 | fprintf (stderr, | |
3432 | "Need step over [LWP %ld]? Ignoring, suspended\n", | |
3433 | lwpid_of (lwp)); | |
3434 | return 0; | |
3435 | } | |
3436 | ||
d50171e4 PA |
3437 | if (!lwp->need_step_over) |
3438 | { | |
3439 | if (debug_threads) | |
3440 | fprintf (stderr, | |
3441 | "Need step over [LWP %ld]? No\n", lwpid_of (lwp)); | |
3442 | } | |
5544ad89 | 3443 | |
bd99dc85 | 3444 | if (lwp->status_pending_p) |
d50171e4 PA |
3445 | { |
3446 | if (debug_threads) | |
3447 | fprintf (stderr, | |
3448 | "Need step over [LWP %ld]? Ignoring, has pending status.\n", | |
3449 | lwpid_of (lwp)); | |
3450 | return 0; | |
3451 | } | |
3452 | ||
3453 | /* Note: PC, not STOP_PC. Either GDB has adjusted the PC already, | |
3454 | or we have. */ | |
3455 | pc = get_pc (lwp); | |
3456 | ||
3457 | /* If the PC has changed since we stopped, then don't do anything, | |
3458 | and let the breakpoint/tracepoint be hit. This happens if, for | |
3459 | instance, GDB handled the decr_pc_after_break subtraction itself, | |
3460 | GDB is OOL stepping this thread, or the user has issued a "jump" | |
3461 | command, or poked thread's registers herself. */ | |
3462 | if (pc != lwp->stop_pc) | |
3463 | { | |
3464 | if (debug_threads) | |
3465 | fprintf (stderr, | |
3466 | "Need step over [LWP %ld]? Cancelling, PC was changed. " | |
3467 | "Old stop_pc was 0x%s, PC is now 0x%s\n", | |
3468 | lwpid_of (lwp), paddress (lwp->stop_pc), paddress (pc)); | |
3469 | ||
3470 | lwp->need_step_over = 0; | |
3471 | return 0; | |
3472 | } | |
3473 | ||
3474 | saved_inferior = current_inferior; | |
8336d594 | 3475 | current_inferior = thread; |
d50171e4 | 3476 | |
8b07ae33 | 3477 | /* We can only step over breakpoints we know about. */ |
fa593d66 | 3478 | if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc)) |
d50171e4 | 3479 | { |
8b07ae33 | 3480 | /* Don't step over a breakpoint that GDB expects to hit |
9f3a5c85 LM |
3481 | though. If the condition is being evaluated on the target's side |
3482 | and it evaluate to false, step over this breakpoint as well. */ | |
3483 | if (gdb_breakpoint_here (pc) | |
d3ce09f5 SS |
3484 | && gdb_condition_true_at_breakpoint (pc) |
3485 | && gdb_no_commands_at_breakpoint (pc)) | |
8b07ae33 PA |
3486 | { |
3487 | if (debug_threads) | |
3488 | fprintf (stderr, | |
3489 | "Need step over [LWP %ld]? yes, but found" | |
3490 | " GDB breakpoint at 0x%s; skipping step over\n", | |
3491 | lwpid_of (lwp), paddress (pc)); | |
d50171e4 | 3492 | |
8b07ae33 PA |
3493 | current_inferior = saved_inferior; |
3494 | return 0; | |
3495 | } | |
3496 | else | |
3497 | { | |
3498 | if (debug_threads) | |
3499 | fprintf (stderr, | |
493e2a69 MS |
3500 | "Need step over [LWP %ld]? yes, " |
3501 | "found breakpoint at 0x%s\n", | |
8b07ae33 | 3502 | lwpid_of (lwp), paddress (pc)); |
d50171e4 | 3503 | |
8b07ae33 PA |
3504 | /* We've found an lwp that needs stepping over --- return 1 so |
3505 | that find_inferior stops looking. */ | |
3506 | current_inferior = saved_inferior; | |
3507 | ||
3508 | /* If the step over is cancelled, this is set again. */ | |
3509 | lwp->need_step_over = 0; | |
3510 | return 1; | |
3511 | } | |
d50171e4 PA |
3512 | } |
3513 | ||
3514 | current_inferior = saved_inferior; | |
3515 | ||
3516 | if (debug_threads) | |
3517 | fprintf (stderr, | |
3518 | "Need step over [LWP %ld]? No, no breakpoint found at 0x%s\n", | |
3519 | lwpid_of (lwp), paddress (pc)); | |
c6ecbae5 | 3520 | |
bd99dc85 | 3521 | return 0; |
5544ad89 DJ |
3522 | } |
3523 | ||
d50171e4 PA |
3524 | /* Start a step-over operation on LWP. When LWP stopped at a |
3525 | breakpoint, to make progress, we need to remove the breakpoint out | |
3526 | of the way. If we let other threads run while we do that, they may | |
3527 | pass by the breakpoint location and miss hitting it. To avoid | |
3528 | that, a step-over momentarily stops all threads while LWP is | |
3529 | single-stepped while the breakpoint is temporarily uninserted from | |
3530 | the inferior. When the single-step finishes, we reinsert the | |
3531 | breakpoint, and let all threads that are supposed to be running, | |
3532 | run again. | |
3533 | ||
3534 | On targets that don't support hardware single-step, we don't | |
3535 | currently support full software single-stepping. Instead, we only | |
3536 | support stepping over the thread event breakpoint, by asking the | |
3537 | low target where to place a reinsert breakpoint. Since this | |
3538 | routine assumes the breakpoint being stepped over is a thread event | |
3539 | breakpoint, it usually assumes the return address of the current | |
3540 | function is a good enough place to set the reinsert breakpoint. */ | |
3541 | ||
3542 | static int | |
3543 | start_step_over (struct lwp_info *lwp) | |
3544 | { | |
3545 | struct thread_info *saved_inferior; | |
3546 | CORE_ADDR pc; | |
3547 | int step; | |
3548 | ||
3549 | if (debug_threads) | |
3550 | fprintf (stderr, | |
3551 | "Starting step-over on LWP %ld. Stopping all threads\n", | |
3552 | lwpid_of (lwp)); | |
3553 | ||
7984d532 PA |
3554 | stop_all_lwps (1, lwp); |
3555 | gdb_assert (lwp->suspended == 0); | |
d50171e4 PA |
3556 | |
3557 | if (debug_threads) | |
3558 | fprintf (stderr, "Done stopping all threads for step-over.\n"); | |
3559 | ||
3560 | /* Note, we should always reach here with an already adjusted PC, | |
3561 | either by GDB (if we're resuming due to GDB's request), or by our | |
3562 | caller, if we just finished handling an internal breakpoint GDB | |
3563 | shouldn't care about. */ | |
3564 | pc = get_pc (lwp); | |
3565 | ||
3566 | saved_inferior = current_inferior; | |
3567 | current_inferior = get_lwp_thread (lwp); | |
3568 | ||
3569 | lwp->bp_reinsert = pc; | |
3570 | uninsert_breakpoints_at (pc); | |
fa593d66 | 3571 | uninsert_fast_tracepoint_jumps_at (pc); |
d50171e4 PA |
3572 | |
3573 | if (can_hardware_single_step ()) | |
3574 | { | |
3575 | step = 1; | |
3576 | } | |
3577 | else | |
3578 | { | |
3579 | CORE_ADDR raddr = (*the_low_target.breakpoint_reinsert_addr) (); | |
3580 | set_reinsert_breakpoint (raddr); | |
3581 | step = 0; | |
3582 | } | |
3583 | ||
3584 | current_inferior = saved_inferior; | |
3585 | ||
3586 | linux_resume_one_lwp (lwp, step, 0, NULL); | |
3587 | ||
3588 | /* Require next event from this LWP. */ | |
3589 | step_over_bkpt = lwp->head.id; | |
3590 | return 1; | |
3591 | } | |
3592 | ||
3593 | /* Finish a step-over. Reinsert the breakpoint we had uninserted in | |
3594 | start_step_over, if still there, and delete any reinsert | |
3595 | breakpoints we've set, on non hardware single-step targets. */ | |
3596 | ||
3597 | static int | |
3598 | finish_step_over (struct lwp_info *lwp) | |
3599 | { | |
3600 | if (lwp->bp_reinsert != 0) | |
3601 | { | |
3602 | if (debug_threads) | |
3603 | fprintf (stderr, "Finished step over.\n"); | |
3604 | ||
3605 | /* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there | |
3606 | may be no breakpoint to reinsert there by now. */ | |
3607 | reinsert_breakpoints_at (lwp->bp_reinsert); | |
fa593d66 | 3608 | reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert); |
d50171e4 PA |
3609 | |
3610 | lwp->bp_reinsert = 0; | |
3611 | ||
3612 | /* Delete any software-single-step reinsert breakpoints. No | |
3613 | longer needed. We don't have to worry about other threads | |
3614 | hitting this trap, and later not being able to explain it, | |
3615 | because we were stepping over a breakpoint, and we hold all | |
3616 | threads but LWP stopped while doing that. */ | |
3617 | if (!can_hardware_single_step ()) | |
3618 | delete_reinsert_breakpoints (); | |
3619 | ||
3620 | step_over_bkpt = null_ptid; | |
3621 | return 1; | |
3622 | } | |
3623 | else | |
3624 | return 0; | |
3625 | } | |
3626 | ||
5544ad89 DJ |
3627 | /* This function is called once per thread. We check the thread's resume |
3628 | request, which will tell us whether to resume, step, or leave the thread | |
bd99dc85 | 3629 | stopped; and what signal, if any, it should be sent. |
5544ad89 | 3630 | |
bd99dc85 PA |
3631 | For threads which we aren't explicitly told otherwise, we preserve |
3632 | the stepping flag; this is used for stepping over gdbserver-placed | |
3633 | breakpoints. | |
3634 | ||
3635 | If pending_flags was set in any thread, we queue any needed | |
3636 | signals, since we won't actually resume. We already have a pending | |
3637 | event to report, so we don't need to preserve any step requests; | |
3638 | they should be re-issued if necessary. */ | |
3639 | ||
3640 | static int | |
3641 | linux_resume_one_thread (struct inferior_list_entry *entry, void *arg) | |
5544ad89 | 3642 | { |
54a0b537 | 3643 | struct lwp_info *lwp; |
5544ad89 | 3644 | struct thread_info *thread; |
bd99dc85 | 3645 | int step; |
d50171e4 PA |
3646 | int leave_all_stopped = * (int *) arg; |
3647 | int leave_pending; | |
5544ad89 DJ |
3648 | |
3649 | thread = (struct thread_info *) entry; | |
54a0b537 | 3650 | lwp = get_thread_lwp (thread); |
5544ad89 | 3651 | |
2bd7c093 | 3652 | if (lwp->resume == NULL) |
bd99dc85 | 3653 | return 0; |
5544ad89 | 3654 | |
bd99dc85 | 3655 | if (lwp->resume->kind == resume_stop) |
5544ad89 | 3656 | { |
bd99dc85 | 3657 | if (debug_threads) |
d50171e4 | 3658 | fprintf (stderr, "resume_stop request for LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 PA |
3659 | |
3660 | if (!lwp->stopped) | |
3661 | { | |
3662 | if (debug_threads) | |
d50171e4 | 3663 | fprintf (stderr, "stopping LWP %ld\n", lwpid_of (lwp)); |
bd99dc85 | 3664 | |
d50171e4 PA |
3665 | /* Stop the thread, and wait for the event asynchronously, |
3666 | through the event loop. */ | |
02fc4de7 | 3667 | send_sigstop (lwp); |
bd99dc85 PA |
3668 | } |
3669 | else | |
3670 | { | |
3671 | if (debug_threads) | |
d50171e4 PA |
3672 | fprintf (stderr, "already stopped LWP %ld\n", |
3673 | lwpid_of (lwp)); | |
3674 | ||
3675 | /* The LWP may have been stopped in an internal event that | |
3676 | was not meant to be notified back to GDB (e.g., gdbserver | |
3677 | breakpoint), so we should be reporting a stop event in | |
3678 | this case too. */ | |
3679 | ||
3680 | /* If the thread already has a pending SIGSTOP, this is a | |
3681 | no-op. Otherwise, something later will presumably resume | |
3682 | the thread and this will cause it to cancel any pending | |
3683 | operation, due to last_resume_kind == resume_stop. If | |
3684 | the thread already has a pending status to report, we | |
3685 | will still report it the next time we wait - see | |
3686 | status_pending_p_callback. */ | |
1a981360 PA |
3687 | |
3688 | /* If we already have a pending signal to report, then | |
3689 | there's no need to queue a SIGSTOP, as this means we're | |
3690 | midway through moving the LWP out of the jumppad, and we | |
3691 | will report the pending signal as soon as that is | |
3692 | finished. */ | |
3693 | if (lwp->pending_signals_to_report == NULL) | |
3694 | send_sigstop (lwp); | |
bd99dc85 | 3695 | } |
32ca6d61 | 3696 | |
bd99dc85 PA |
3697 | /* For stop requests, we're done. */ |
3698 | lwp->resume = NULL; | |
fc7238bb | 3699 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3700 | return 0; |
5544ad89 DJ |
3701 | } |
3702 | ||
bd99dc85 PA |
3703 | /* If this thread which is about to be resumed has a pending status, |
3704 | then don't resume any threads - we can just report the pending | |
3705 | status. Make sure to queue any signals that would otherwise be | |
3706 | sent. In all-stop mode, we do this decision based on if *any* | |
d50171e4 PA |
3707 | thread has a pending status. If there's a thread that needs the |
3708 | step-over-breakpoint dance, then don't resume any other thread | |
3709 | but that particular one. */ | |
3710 | leave_pending = (lwp->status_pending_p || leave_all_stopped); | |
5544ad89 | 3711 | |
d50171e4 | 3712 | if (!leave_pending) |
bd99dc85 PA |
3713 | { |
3714 | if (debug_threads) | |
3715 | fprintf (stderr, "resuming LWP %ld\n", lwpid_of (lwp)); | |
5544ad89 | 3716 | |
d50171e4 | 3717 | step = (lwp->resume->kind == resume_step); |
2acc282a | 3718 | linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL); |
bd99dc85 PA |
3719 | } |
3720 | else | |
3721 | { | |
3722 | if (debug_threads) | |
3723 | fprintf (stderr, "leaving LWP %ld stopped\n", lwpid_of (lwp)); | |
5544ad89 | 3724 | |
bd99dc85 PA |
3725 | /* If we have a new signal, enqueue the signal. */ |
3726 | if (lwp->resume->sig != 0) | |
3727 | { | |
3728 | struct pending_signals *p_sig; | |
3729 | p_sig = xmalloc (sizeof (*p_sig)); | |
3730 | p_sig->prev = lwp->pending_signals; | |
3731 | p_sig->signal = lwp->resume->sig; | |
3732 | memset (&p_sig->info, 0, sizeof (siginfo_t)); | |
3733 | ||
3734 | /* If this is the same signal we were previously stopped by, | |
3735 | make sure to queue its siginfo. We can ignore the return | |
3736 | value of ptrace; if it fails, we'll skip | |
3737 | PTRACE_SETSIGINFO. */ | |
3738 | if (WIFSTOPPED (lwp->last_status) | |
3739 | && WSTOPSIG (lwp->last_status) == lwp->resume->sig) | |
b8e1b30e | 3740 | ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), (PTRACE_TYPE_ARG3) 0, |
56f7af9c | 3741 | &p_sig->info); |
bd99dc85 PA |
3742 | |
3743 | lwp->pending_signals = p_sig; | |
3744 | } | |
3745 | } | |
5544ad89 | 3746 | |
fc7238bb | 3747 | thread->last_status.kind = TARGET_WAITKIND_IGNORE; |
bd99dc85 | 3748 | lwp->resume = NULL; |
5544ad89 | 3749 | return 0; |
0d62e5e8 DJ |
3750 | } |
3751 | ||
3752 | static void | |
2bd7c093 | 3753 | linux_resume (struct thread_resume *resume_info, size_t n) |
0d62e5e8 | 3754 | { |
2bd7c093 | 3755 | struct thread_resume_array array = { resume_info, n }; |
d50171e4 PA |
3756 | struct lwp_info *need_step_over = NULL; |
3757 | int any_pending; | |
3758 | int leave_all_stopped; | |
c6ecbae5 | 3759 | |
2bd7c093 | 3760 | find_inferior (&all_threads, linux_set_resume_request, &array); |
5544ad89 | 3761 | |
d50171e4 PA |
3762 | /* If there is a thread which would otherwise be resumed, which has |
3763 | a pending status, then don't resume any threads - we can just | |
3764 | report the pending status. Make sure to queue any signals that | |
3765 | would otherwise be sent. In non-stop mode, we'll apply this | |
3766 | logic to each thread individually. We consume all pending events | |
3767 | before considering to start a step-over (in all-stop). */ | |
3768 | any_pending = 0; | |
bd99dc85 | 3769 | if (!non_stop) |
d50171e4 PA |
3770 | find_inferior (&all_lwps, resume_status_pending_p, &any_pending); |
3771 | ||
3772 | /* If there is a thread which would otherwise be resumed, which is | |
3773 | stopped at a breakpoint that needs stepping over, then don't | |
3774 | resume any threads - have it step over the breakpoint with all | |
3775 | other threads stopped, then resume all threads again. Make sure | |
3776 | to queue any signals that would otherwise be delivered or | |
3777 | queued. */ | |
3778 | if (!any_pending && supports_breakpoints ()) | |
3779 | need_step_over | |
3780 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3781 | need_step_over_p, NULL); | |
3782 | ||
3783 | leave_all_stopped = (need_step_over != NULL || any_pending); | |
3784 | ||
3785 | if (debug_threads) | |
3786 | { | |
3787 | if (need_step_over != NULL) | |
3788 | fprintf (stderr, "Not resuming all, need step over\n"); | |
3789 | else if (any_pending) | |
3790 | fprintf (stderr, | |
3791 | "Not resuming, all-stop and found " | |
3792 | "an LWP with pending status\n"); | |
3793 | else | |
3794 | fprintf (stderr, "Resuming, no pending status or step over needed\n"); | |
3795 | } | |
3796 | ||
3797 | /* Even if we're leaving threads stopped, queue all signals we'd | |
3798 | otherwise deliver. */ | |
3799 | find_inferior (&all_threads, linux_resume_one_thread, &leave_all_stopped); | |
3800 | ||
3801 | if (need_step_over) | |
3802 | start_step_over (need_step_over); | |
3803 | } | |
3804 | ||
3805 | /* This function is called once per thread. We check the thread's | |
3806 | last resume request, which will tell us whether to resume, step, or | |
3807 | leave the thread stopped. Any signal the client requested to be | |
3808 | delivered has already been enqueued at this point. | |
3809 | ||
3810 | If any thread that GDB wants running is stopped at an internal | |
3811 | breakpoint that needs stepping over, we start a step-over operation | |
3812 | on that particular thread, and leave all others stopped. */ | |
3813 | ||
7984d532 PA |
3814 | static int |
3815 | proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
d50171e4 | 3816 | { |
7984d532 | 3817 | struct lwp_info *lwp = (struct lwp_info *) entry; |
8336d594 | 3818 | struct thread_info *thread; |
d50171e4 PA |
3819 | int step; |
3820 | ||
7984d532 PA |
3821 | if (lwp == except) |
3822 | return 0; | |
d50171e4 PA |
3823 | |
3824 | if (debug_threads) | |
3825 | fprintf (stderr, | |
3826 | "proceed_one_lwp: lwp %ld\n", lwpid_of (lwp)); | |
3827 | ||
3828 | if (!lwp->stopped) | |
3829 | { | |
3830 | if (debug_threads) | |
3831 | fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp)); | |
7984d532 | 3832 | return 0; |
d50171e4 PA |
3833 | } |
3834 | ||
8336d594 PA |
3835 | thread = get_lwp_thread (lwp); |
3836 | ||
02fc4de7 PA |
3837 | if (thread->last_resume_kind == resume_stop |
3838 | && thread->last_status.kind != TARGET_WAITKIND_IGNORE) | |
d50171e4 PA |
3839 | { |
3840 | if (debug_threads) | |
02fc4de7 PA |
3841 | fprintf (stderr, " client wants LWP to remain %ld stopped\n", |
3842 | lwpid_of (lwp)); | |
7984d532 | 3843 | return 0; |
d50171e4 PA |
3844 | } |
3845 | ||
3846 | if (lwp->status_pending_p) | |
3847 | { | |
3848 | if (debug_threads) | |
3849 | fprintf (stderr, " LWP %ld has pending status, leaving stopped\n", | |
3850 | lwpid_of (lwp)); | |
7984d532 | 3851 | return 0; |
d50171e4 PA |
3852 | } |
3853 | ||
7984d532 PA |
3854 | gdb_assert (lwp->suspended >= 0); |
3855 | ||
d50171e4 PA |
3856 | if (lwp->suspended) |
3857 | { | |
3858 | if (debug_threads) | |
3859 | fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp)); | |
7984d532 | 3860 | return 0; |
d50171e4 PA |
3861 | } |
3862 | ||
1a981360 PA |
3863 | if (thread->last_resume_kind == resume_stop |
3864 | && lwp->pending_signals_to_report == NULL | |
3865 | && lwp->collecting_fast_tracepoint == 0) | |
02fc4de7 PA |
3866 | { |
3867 | /* We haven't reported this LWP as stopped yet (otherwise, the | |
3868 | last_status.kind check above would catch it, and we wouldn't | |
3869 | reach here. This LWP may have been momentarily paused by a | |
3870 | stop_all_lwps call while handling for example, another LWP's | |
3871 | step-over. In that case, the pending expected SIGSTOP signal | |
3872 | that was queued at vCont;t handling time will have already | |
3873 | been consumed by wait_for_sigstop, and so we need to requeue | |
3874 | another one here. Note that if the LWP already has a SIGSTOP | |
3875 | pending, this is a no-op. */ | |
3876 | ||
3877 | if (debug_threads) | |
3878 | fprintf (stderr, | |
3879 | "Client wants LWP %ld to stop. " | |
3880 | "Making sure it has a SIGSTOP pending\n", | |
3881 | lwpid_of (lwp)); | |
3882 | ||
3883 | send_sigstop (lwp); | |
3884 | } | |
3885 | ||
8336d594 | 3886 | step = thread->last_resume_kind == resume_step; |
d50171e4 | 3887 | linux_resume_one_lwp (lwp, step, 0, NULL); |
7984d532 PA |
3888 | return 0; |
3889 | } | |
3890 | ||
3891 | static int | |
3892 | unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except) | |
3893 | { | |
3894 | struct lwp_info *lwp = (struct lwp_info *) entry; | |
3895 | ||
3896 | if (lwp == except) | |
3897 | return 0; | |
3898 | ||
3899 | lwp->suspended--; | |
3900 | gdb_assert (lwp->suspended >= 0); | |
3901 | ||
3902 | return proceed_one_lwp (entry, except); | |
d50171e4 PA |
3903 | } |
3904 | ||
3905 | /* When we finish a step-over, set threads running again. If there's | |
3906 | another thread that may need a step-over, now's the time to start | |
3907 | it. Eventually, we'll move all threads past their breakpoints. */ | |
3908 | ||
3909 | static void | |
3910 | proceed_all_lwps (void) | |
3911 | { | |
3912 | struct lwp_info *need_step_over; | |
3913 | ||
3914 | /* If there is a thread which would otherwise be resumed, which is | |
3915 | stopped at a breakpoint that needs stepping over, then don't | |
3916 | resume any threads - have it step over the breakpoint with all | |
3917 | other threads stopped, then resume all threads again. */ | |
3918 | ||
3919 | if (supports_breakpoints ()) | |
3920 | { | |
3921 | need_step_over | |
3922 | = (struct lwp_info *) find_inferior (&all_lwps, | |
3923 | need_step_over_p, NULL); | |
3924 | ||
3925 | if (need_step_over != NULL) | |
3926 | { | |
3927 | if (debug_threads) | |
3928 | fprintf (stderr, "proceed_all_lwps: found " | |
3929 | "thread %ld needing a step-over\n", | |
3930 | lwpid_of (need_step_over)); | |
3931 | ||
3932 | start_step_over (need_step_over); | |
3933 | return; | |
3934 | } | |
3935 | } | |
5544ad89 | 3936 | |
d50171e4 PA |
3937 | if (debug_threads) |
3938 | fprintf (stderr, "Proceeding, no step-over needed\n"); | |
3939 | ||
7984d532 | 3940 | find_inferior (&all_lwps, proceed_one_lwp, NULL); |
d50171e4 PA |
3941 | } |
3942 | ||
3943 | /* Stopped LWPs that the client wanted to be running, that don't have | |
3944 | pending statuses, are set to run again, except for EXCEPT, if not | |
3945 | NULL. This undoes a stop_all_lwps call. */ | |
3946 | ||
3947 | static void | |
7984d532 | 3948 | unstop_all_lwps (int unsuspend, struct lwp_info *except) |
d50171e4 | 3949 | { |
5544ad89 DJ |
3950 | if (debug_threads) |
3951 | { | |
d50171e4 PA |
3952 | if (except) |
3953 | fprintf (stderr, | |
3954 | "unstopping all lwps, except=(LWP %ld)\n", lwpid_of (except)); | |
5544ad89 | 3955 | else |
d50171e4 PA |
3956 | fprintf (stderr, |
3957 | "unstopping all lwps\n"); | |
5544ad89 DJ |
3958 | } |
3959 | ||
7984d532 PA |
3960 | if (unsuspend) |
3961 | find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except); | |
3962 | else | |
3963 | find_inferior (&all_lwps, proceed_one_lwp, except); | |
0d62e5e8 DJ |
3964 | } |
3965 | ||
58caa3dc DJ |
3966 | |
3967 | #ifdef HAVE_LINUX_REGSETS | |
3968 | ||
1faeff08 MR |
3969 | #define use_linux_regsets 1 |
3970 | ||
030031ee PA |
3971 | /* Returns true if REGSET has been disabled. */ |
3972 | ||
3973 | static int | |
3974 | regset_disabled (struct regsets_info *info, struct regset_info *regset) | |
3975 | { | |
3976 | return (info->disabled_regsets != NULL | |
3977 | && info->disabled_regsets[regset - info->regsets]); | |
3978 | } | |
3979 | ||
3980 | /* Disable REGSET. */ | |
3981 | ||
3982 | static void | |
3983 | disable_regset (struct regsets_info *info, struct regset_info *regset) | |
3984 | { | |
3985 | int dr_offset; | |
3986 | ||
3987 | dr_offset = regset - info->regsets; | |
3988 | if (info->disabled_regsets == NULL) | |
3989 | info->disabled_regsets = xcalloc (1, info->num_regsets); | |
3990 | info->disabled_regsets[dr_offset] = 1; | |
3991 | } | |
3992 | ||
58caa3dc | 3993 | static int |
3aee8918 PA |
3994 | regsets_fetch_inferior_registers (struct regsets_info *regsets_info, |
3995 | struct regcache *regcache) | |
58caa3dc DJ |
3996 | { |
3997 | struct regset_info *regset; | |
e9d25b98 | 3998 | int saw_general_regs = 0; |
95954743 | 3999 | int pid; |
1570b33e | 4000 | struct iovec iov; |
58caa3dc | 4001 | |
3aee8918 | 4002 | regset = regsets_info->regsets; |
58caa3dc | 4003 | |
95954743 | 4004 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4005 | while (regset->size >= 0) |
4006 | { | |
1570b33e L |
4007 | void *buf, *data; |
4008 | int nt_type, res; | |
58caa3dc | 4009 | |
030031ee | 4010 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4011 | { |
4012 | regset ++; | |
4013 | continue; | |
4014 | } | |
4015 | ||
bca929d3 | 4016 | buf = xmalloc (regset->size); |
1570b33e L |
4017 | |
4018 | nt_type = regset->nt_type; | |
4019 | if (nt_type) | |
4020 | { | |
4021 | iov.iov_base = buf; | |
4022 | iov.iov_len = regset->size; | |
4023 | data = (void *) &iov; | |
4024 | } | |
4025 | else | |
4026 | data = buf; | |
4027 | ||
dfb64f85 | 4028 | #ifndef __sparc__ |
f15f9948 | 4029 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4030 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4031 | #else |
1570b33e | 4032 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4033 | #endif |
58caa3dc DJ |
4034 | if (res < 0) |
4035 | { | |
4036 | if (errno == EIO) | |
4037 | { | |
52fa2412 | 4038 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4039 | this process mode. */ |
030031ee | 4040 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4041 | free (buf); |
52fa2412 | 4042 | continue; |
58caa3dc DJ |
4043 | } |
4044 | else | |
4045 | { | |
0d62e5e8 | 4046 | char s[256]; |
95954743 PA |
4047 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
4048 | pid); | |
0d62e5e8 | 4049 | perror (s); |
58caa3dc DJ |
4050 | } |
4051 | } | |
e9d25b98 DJ |
4052 | else if (regset->type == GENERAL_REGS) |
4053 | saw_general_regs = 1; | |
442ea881 | 4054 | regset->store_function (regcache, buf); |
58caa3dc | 4055 | regset ++; |
fdeb2a12 | 4056 | free (buf); |
58caa3dc | 4057 | } |
e9d25b98 DJ |
4058 | if (saw_general_regs) |
4059 | return 0; | |
4060 | else | |
4061 | return 1; | |
58caa3dc DJ |
4062 | } |
4063 | ||
4064 | static int | |
3aee8918 PA |
4065 | regsets_store_inferior_registers (struct regsets_info *regsets_info, |
4066 | struct regcache *regcache) | |
58caa3dc DJ |
4067 | { |
4068 | struct regset_info *regset; | |
e9d25b98 | 4069 | int saw_general_regs = 0; |
95954743 | 4070 | int pid; |
1570b33e | 4071 | struct iovec iov; |
58caa3dc | 4072 | |
3aee8918 | 4073 | regset = regsets_info->regsets; |
58caa3dc | 4074 | |
95954743 | 4075 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
58caa3dc DJ |
4076 | while (regset->size >= 0) |
4077 | { | |
1570b33e L |
4078 | void *buf, *data; |
4079 | int nt_type, res; | |
58caa3dc | 4080 | |
030031ee | 4081 | if (regset->size == 0 || regset_disabled (regsets_info, regset)) |
58caa3dc DJ |
4082 | { |
4083 | regset ++; | |
4084 | continue; | |
4085 | } | |
4086 | ||
bca929d3 | 4087 | buf = xmalloc (regset->size); |
545587ee DJ |
4088 | |
4089 | /* First fill the buffer with the current register set contents, | |
4090 | in case there are any items in the kernel's regset that are | |
4091 | not in gdbserver's regcache. */ | |
1570b33e L |
4092 | |
4093 | nt_type = regset->nt_type; | |
4094 | if (nt_type) | |
4095 | { | |
4096 | iov.iov_base = buf; | |
4097 | iov.iov_len = regset->size; | |
4098 | data = (void *) &iov; | |
4099 | } | |
4100 | else | |
4101 | data = buf; | |
4102 | ||
dfb64f85 | 4103 | #ifndef __sparc__ |
f15f9948 | 4104 | res = ptrace (regset->get_request, pid, |
b8e1b30e | 4105 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4106 | #else |
689cc2ae | 4107 | res = ptrace (regset->get_request, pid, data, nt_type); |
dfb64f85 | 4108 | #endif |
545587ee DJ |
4109 | |
4110 | if (res == 0) | |
4111 | { | |
4112 | /* Then overlay our cached registers on that. */ | |
442ea881 | 4113 | regset->fill_function (regcache, buf); |
545587ee DJ |
4114 | |
4115 | /* Only now do we write the register set. */ | |
dfb64f85 | 4116 | #ifndef __sparc__ |
f15f9948 | 4117 | res = ptrace (regset->set_request, pid, |
b8e1b30e | 4118 | (PTRACE_TYPE_ARG3) (long) nt_type, data); |
dfb64f85 | 4119 | #else |
1570b33e | 4120 | res = ptrace (regset->set_request, pid, data, nt_type); |
dfb64f85 | 4121 | #endif |
545587ee DJ |
4122 | } |
4123 | ||
58caa3dc DJ |
4124 | if (res < 0) |
4125 | { | |
4126 | if (errno == EIO) | |
4127 | { | |
52fa2412 | 4128 | /* If we get EIO on a regset, do not try it again for |
3aee8918 | 4129 | this process mode. */ |
030031ee | 4130 | disable_regset (regsets_info, regset); |
fdeb2a12 | 4131 | free (buf); |
52fa2412 | 4132 | continue; |
58caa3dc | 4133 | } |
3221518c UW |
4134 | else if (errno == ESRCH) |
4135 | { | |
1b3f6016 PA |
4136 | /* At this point, ESRCH should mean the process is |
4137 | already gone, in which case we simply ignore attempts | |
4138 | to change its registers. See also the related | |
4139 | comment in linux_resume_one_lwp. */ | |
fdeb2a12 | 4140 | free (buf); |
3221518c UW |
4141 | return 0; |
4142 | } | |
58caa3dc DJ |
4143 | else |
4144 | { | |
ce3a066d | 4145 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
58caa3dc DJ |
4146 | } |
4147 | } | |
e9d25b98 DJ |
4148 | else if (regset->type == GENERAL_REGS) |
4149 | saw_general_regs = 1; | |
58caa3dc | 4150 | regset ++; |
09ec9b38 | 4151 | free (buf); |
58caa3dc | 4152 | } |
e9d25b98 DJ |
4153 | if (saw_general_regs) |
4154 | return 0; | |
4155 | else | |
4156 | return 1; | |
58caa3dc DJ |
4157 | } |
4158 | ||
1faeff08 | 4159 | #else /* !HAVE_LINUX_REGSETS */ |
58caa3dc | 4160 | |
1faeff08 | 4161 | #define use_linux_regsets 0 |
3aee8918 PA |
4162 | #define regsets_fetch_inferior_registers(regsets_info, regcache) 1 |
4163 | #define regsets_store_inferior_registers(regsets_info, regcache) 1 | |
58caa3dc | 4164 | |
58caa3dc | 4165 | #endif |
1faeff08 MR |
4166 | |
4167 | /* Return 1 if register REGNO is supported by one of the regset ptrace | |
4168 | calls or 0 if it has to be transferred individually. */ | |
4169 | ||
4170 | static int | |
3aee8918 | 4171 | linux_register_in_regsets (const struct regs_info *regs_info, int regno) |
1faeff08 MR |
4172 | { |
4173 | unsigned char mask = 1 << (regno % 8); | |
4174 | size_t index = regno / 8; | |
4175 | ||
4176 | return (use_linux_regsets | |
3aee8918 PA |
4177 | && (regs_info->regset_bitmap == NULL |
4178 | || (regs_info->regset_bitmap[index] & mask) != 0)); | |
1faeff08 MR |
4179 | } |
4180 | ||
58caa3dc | 4181 | #ifdef HAVE_LINUX_USRREGS |
1faeff08 MR |
4182 | |
4183 | int | |
3aee8918 | 4184 | register_addr (const struct usrregs_info *usrregs, int regnum) |
1faeff08 MR |
4185 | { |
4186 | int addr; | |
4187 | ||
3aee8918 | 4188 | if (regnum < 0 || regnum >= usrregs->num_regs) |
1faeff08 MR |
4189 | error ("Invalid register number %d.", regnum); |
4190 | ||
3aee8918 | 4191 | addr = usrregs->regmap[regnum]; |
1faeff08 MR |
4192 | |
4193 | return addr; | |
4194 | } | |
4195 | ||
4196 | /* Fetch one register. */ | |
4197 | static void | |
3aee8918 PA |
4198 | fetch_register (const struct usrregs_info *usrregs, |
4199 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4200 | { |
4201 | CORE_ADDR regaddr; | |
4202 | int i, size; | |
4203 | char *buf; | |
4204 | int pid; | |
4205 | ||
3aee8918 | 4206 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4207 | return; |
4208 | if ((*the_low_target.cannot_fetch_register) (regno)) | |
4209 | return; | |
4210 | ||
3aee8918 | 4211 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4212 | if (regaddr == -1) |
4213 | return; | |
4214 | ||
3aee8918 PA |
4215 | size = ((register_size (regcache->tdesc, regno) |
4216 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4217 | & -sizeof (PTRACE_XFER_TYPE)); |
4218 | buf = alloca (size); | |
4219 | ||
4220 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4221 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4222 | { | |
4223 | errno = 0; | |
4224 | *(PTRACE_XFER_TYPE *) (buf + i) = | |
4225 | ptrace (PTRACE_PEEKUSER, pid, | |
4226 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4227 | of coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4228 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, (PTRACE_TYPE_ARG4) 0); |
1faeff08 MR |
4229 | regaddr += sizeof (PTRACE_XFER_TYPE); |
4230 | if (errno != 0) | |
4231 | error ("reading register %d: %s", regno, strerror (errno)); | |
4232 | } | |
4233 | ||
4234 | if (the_low_target.supply_ptrace_register) | |
4235 | the_low_target.supply_ptrace_register (regcache, regno, buf); | |
4236 | else | |
4237 | supply_register (regcache, regno, buf); | |
4238 | } | |
4239 | ||
4240 | /* Store one register. */ | |
4241 | static void | |
3aee8918 PA |
4242 | store_register (const struct usrregs_info *usrregs, |
4243 | struct regcache *regcache, int regno) | |
1faeff08 MR |
4244 | { |
4245 | CORE_ADDR regaddr; | |
4246 | int i, size; | |
4247 | char *buf; | |
4248 | int pid; | |
4249 | ||
3aee8918 | 4250 | if (regno >= usrregs->num_regs) |
1faeff08 MR |
4251 | return; |
4252 | if ((*the_low_target.cannot_store_register) (regno)) | |
4253 | return; | |
4254 | ||
3aee8918 | 4255 | regaddr = register_addr (usrregs, regno); |
1faeff08 MR |
4256 | if (regaddr == -1) |
4257 | return; | |
4258 | ||
3aee8918 PA |
4259 | size = ((register_size (regcache->tdesc, regno) |
4260 | + sizeof (PTRACE_XFER_TYPE) - 1) | |
1faeff08 MR |
4261 | & -sizeof (PTRACE_XFER_TYPE)); |
4262 | buf = alloca (size); | |
4263 | memset (buf, 0, size); | |
4264 | ||
4265 | if (the_low_target.collect_ptrace_register) | |
4266 | the_low_target.collect_ptrace_register (regcache, regno, buf); | |
4267 | else | |
4268 | collect_register (regcache, regno, buf); | |
4269 | ||
4270 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4271 | for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE)) | |
4272 | { | |
4273 | errno = 0; | |
4274 | ptrace (PTRACE_POKEUSER, pid, | |
4275 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4276 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4277 | (PTRACE_TYPE_ARG3) (uintptr_t) regaddr, |
4278 | (PTRACE_TYPE_ARG4) *(PTRACE_XFER_TYPE *) (buf + i)); | |
1faeff08 MR |
4279 | if (errno != 0) |
4280 | { | |
4281 | /* At this point, ESRCH should mean the process is | |
4282 | already gone, in which case we simply ignore attempts | |
4283 | to change its registers. See also the related | |
4284 | comment in linux_resume_one_lwp. */ | |
4285 | if (errno == ESRCH) | |
4286 | return; | |
4287 | ||
4288 | if ((*the_low_target.cannot_store_register) (regno) == 0) | |
4289 | error ("writing register %d: %s", regno, strerror (errno)); | |
4290 | } | |
4291 | regaddr += sizeof (PTRACE_XFER_TYPE); | |
4292 | } | |
4293 | } | |
4294 | ||
4295 | /* Fetch all registers, or just one, from the child process. | |
4296 | If REGNO is -1, do this for all registers, skipping any that are | |
4297 | assumed to have been retrieved by regsets_fetch_inferior_registers, | |
4298 | unless ALL is non-zero. | |
4299 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4300 | static void | |
3aee8918 PA |
4301 | usr_fetch_inferior_registers (const struct regs_info *regs_info, |
4302 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4303 | { |
3aee8918 PA |
4304 | struct usrregs_info *usr = regs_info->usrregs; |
4305 | ||
1faeff08 MR |
4306 | if (regno == -1) |
4307 | { | |
3aee8918 PA |
4308 | for (regno = 0; regno < usr->num_regs; regno++) |
4309 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4310 | fetch_register (usr, regcache, regno); | |
1faeff08 MR |
4311 | } |
4312 | else | |
3aee8918 | 4313 | fetch_register (usr, regcache, regno); |
1faeff08 MR |
4314 | } |
4315 | ||
4316 | /* Store our register values back into the inferior. | |
4317 | If REGNO is -1, do this for all registers, skipping any that are | |
4318 | assumed to have been saved by regsets_store_inferior_registers, | |
4319 | unless ALL is non-zero. | |
4320 | Otherwise, REGNO specifies which register (so we can save time). */ | |
4321 | static void | |
3aee8918 PA |
4322 | usr_store_inferior_registers (const struct regs_info *regs_info, |
4323 | struct regcache *regcache, int regno, int all) | |
1faeff08 | 4324 | { |
3aee8918 PA |
4325 | struct usrregs_info *usr = regs_info->usrregs; |
4326 | ||
1faeff08 MR |
4327 | if (regno == -1) |
4328 | { | |
3aee8918 PA |
4329 | for (regno = 0; regno < usr->num_regs; regno++) |
4330 | if (all || !linux_register_in_regsets (regs_info, regno)) | |
4331 | store_register (usr, regcache, regno); | |
1faeff08 MR |
4332 | } |
4333 | else | |
3aee8918 | 4334 | store_register (usr, regcache, regno); |
1faeff08 MR |
4335 | } |
4336 | ||
4337 | #else /* !HAVE_LINUX_USRREGS */ | |
4338 | ||
3aee8918 PA |
4339 | #define usr_fetch_inferior_registers(regs_info, regcache, regno, all) do {} while (0) |
4340 | #define usr_store_inferior_registers(regs_info, regcache, regno, all) do {} while (0) | |
1faeff08 | 4341 | |
58caa3dc | 4342 | #endif |
1faeff08 MR |
4343 | |
4344 | ||
4345 | void | |
4346 | linux_fetch_registers (struct regcache *regcache, int regno) | |
4347 | { | |
4348 | int use_regsets; | |
4349 | int all = 0; | |
3aee8918 | 4350 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4351 | |
4352 | if (regno == -1) | |
4353 | { | |
3aee8918 PA |
4354 | if (the_low_target.fetch_register != NULL |
4355 | && regs_info->usrregs != NULL) | |
4356 | for (regno = 0; regno < regs_info->usrregs->num_regs; regno++) | |
c14dfd32 PA |
4357 | (*the_low_target.fetch_register) (regcache, regno); |
4358 | ||
3aee8918 PA |
4359 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, regcache); |
4360 | if (regs_info->usrregs != NULL) | |
4361 | usr_fetch_inferior_registers (regs_info, regcache, -1, all); | |
1faeff08 MR |
4362 | } |
4363 | else | |
4364 | { | |
c14dfd32 PA |
4365 | if (the_low_target.fetch_register != NULL |
4366 | && (*the_low_target.fetch_register) (regcache, regno)) | |
4367 | return; | |
4368 | ||
3aee8918 | 4369 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4370 | if (use_regsets) |
3aee8918 PA |
4371 | all = regsets_fetch_inferior_registers (regs_info->regsets_info, |
4372 | regcache); | |
4373 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4374 | usr_fetch_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4375 | } |
58caa3dc DJ |
4376 | } |
4377 | ||
4378 | void | |
442ea881 | 4379 | linux_store_registers (struct regcache *regcache, int regno) |
58caa3dc | 4380 | { |
1faeff08 MR |
4381 | int use_regsets; |
4382 | int all = 0; | |
3aee8918 | 4383 | const struct regs_info *regs_info = (*the_low_target.regs_info) (); |
1faeff08 MR |
4384 | |
4385 | if (regno == -1) | |
4386 | { | |
3aee8918 PA |
4387 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4388 | regcache); | |
4389 | if (regs_info->usrregs != NULL) | |
4390 | usr_store_inferior_registers (regs_info, regcache, regno, all); | |
1faeff08 MR |
4391 | } |
4392 | else | |
4393 | { | |
3aee8918 | 4394 | use_regsets = linux_register_in_regsets (regs_info, regno); |
1faeff08 | 4395 | if (use_regsets) |
3aee8918 PA |
4396 | all = regsets_store_inferior_registers (regs_info->regsets_info, |
4397 | regcache); | |
4398 | if ((!use_regsets || all) && regs_info->usrregs != NULL) | |
4399 | usr_store_inferior_registers (regs_info, regcache, regno, 1); | |
1faeff08 | 4400 | } |
58caa3dc DJ |
4401 | } |
4402 | ||
da6d8c04 | 4403 | |
da6d8c04 DJ |
4404 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
4405 | to debugger memory starting at MYADDR. */ | |
4406 | ||
c3e735a6 | 4407 | static int |
f450004a | 4408 | linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
da6d8c04 | 4409 | { |
4934b29e MR |
4410 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
4411 | register PTRACE_XFER_TYPE *buffer; | |
4412 | register CORE_ADDR addr; | |
4413 | register int count; | |
4414 | char filename[64]; | |
da6d8c04 | 4415 | register int i; |
4934b29e | 4416 | int ret; |
fd462a61 | 4417 | int fd; |
fd462a61 DJ |
4418 | |
4419 | /* Try using /proc. Don't bother for one word. */ | |
4420 | if (len >= 3 * sizeof (long)) | |
4421 | { | |
4934b29e MR |
4422 | int bytes; |
4423 | ||
fd462a61 DJ |
4424 | /* We could keep this file open and cache it - possibly one per |
4425 | thread. That requires some juggling, but is even faster. */ | |
95954743 | 4426 | sprintf (filename, "/proc/%d/mem", pid); |
fd462a61 DJ |
4427 | fd = open (filename, O_RDONLY | O_LARGEFILE); |
4428 | if (fd == -1) | |
4429 | goto no_proc; | |
4430 | ||
4431 | /* If pread64 is available, use it. It's faster if the kernel | |
4432 | supports it (only one syscall), and it's 64-bit safe even on | |
4433 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4434 | application). */ | |
4435 | #ifdef HAVE_PREAD64 | |
4934b29e | 4436 | bytes = pread64 (fd, myaddr, len, memaddr); |
fd462a61 | 4437 | #else |
4934b29e MR |
4438 | bytes = -1; |
4439 | if (lseek (fd, memaddr, SEEK_SET) != -1) | |
4440 | bytes = read (fd, myaddr, len); | |
fd462a61 | 4441 | #endif |
fd462a61 DJ |
4442 | |
4443 | close (fd); | |
4934b29e MR |
4444 | if (bytes == len) |
4445 | return 0; | |
4446 | ||
4447 | /* Some data was read, we'll try to get the rest with ptrace. */ | |
4448 | if (bytes > 0) | |
4449 | { | |
4450 | memaddr += bytes; | |
4451 | myaddr += bytes; | |
4452 | len -= bytes; | |
4453 | } | |
fd462a61 | 4454 | } |
da6d8c04 | 4455 | |
fd462a61 | 4456 | no_proc: |
4934b29e MR |
4457 | /* Round starting address down to longword boundary. */ |
4458 | addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4459 | /* Round ending address up; get number of longwords that makes. */ | |
4460 | count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) | |
4461 | / sizeof (PTRACE_XFER_TYPE)); | |
4462 | /* Allocate buffer of that many longwords. */ | |
4463 | buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4464 | ||
da6d8c04 | 4465 | /* Read all the longwords */ |
4934b29e | 4466 | errno = 0; |
da6d8c04 DJ |
4467 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
4468 | { | |
14ce3065 DE |
4469 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4470 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4471 | buffer[i] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4472 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4473 | (PTRACE_TYPE_ARG4) 0); | |
c3e735a6 | 4474 | if (errno) |
4934b29e | 4475 | break; |
da6d8c04 | 4476 | } |
4934b29e | 4477 | ret = errno; |
da6d8c04 DJ |
4478 | |
4479 | /* Copy appropriate bytes out of the buffer. */ | |
8d409d16 MR |
4480 | if (i > 0) |
4481 | { | |
4482 | i *= sizeof (PTRACE_XFER_TYPE); | |
4483 | i -= memaddr & (sizeof (PTRACE_XFER_TYPE) - 1); | |
4484 | memcpy (myaddr, | |
4485 | (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), | |
4486 | i < len ? i : len); | |
4487 | } | |
c3e735a6 | 4488 | |
4934b29e | 4489 | return ret; |
da6d8c04 DJ |
4490 | } |
4491 | ||
93ae6fdc PA |
4492 | /* Copy LEN bytes of data from debugger memory at MYADDR to inferior's |
4493 | memory at MEMADDR. On failure (cannot write to the inferior) | |
f0ae6fc3 | 4494 | returns the value of errno. Always succeeds if LEN is zero. */ |
da6d8c04 | 4495 | |
ce3a066d | 4496 | static int |
f450004a | 4497 | linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
da6d8c04 DJ |
4498 | { |
4499 | register int i; | |
4500 | /* Round starting address down to longword boundary. */ | |
4501 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); | |
4502 | /* Round ending address up; get number of longwords that makes. */ | |
4503 | register int count | |
493e2a69 MS |
4504 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
4505 | / sizeof (PTRACE_XFER_TYPE); | |
4506 | ||
da6d8c04 | 4507 | /* Allocate buffer of that many longwords. */ |
493e2a69 MS |
4508 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) |
4509 | alloca (count * sizeof (PTRACE_XFER_TYPE)); | |
4510 | ||
95954743 | 4511 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
da6d8c04 | 4512 | |
f0ae6fc3 PA |
4513 | if (len == 0) |
4514 | { | |
4515 | /* Zero length write always succeeds. */ | |
4516 | return 0; | |
4517 | } | |
4518 | ||
0d62e5e8 DJ |
4519 | if (debug_threads) |
4520 | { | |
58d6951d DJ |
4521 | /* Dump up to four bytes. */ |
4522 | unsigned int val = * (unsigned int *) myaddr; | |
4523 | if (len == 1) | |
4524 | val = val & 0xff; | |
4525 | else if (len == 2) | |
4526 | val = val & 0xffff; | |
4527 | else if (len == 3) | |
4528 | val = val & 0xffffff; | |
4529 | fprintf (stderr, "Writing %0*x to 0x%08lx\n", 2 * ((len < 4) ? len : 4), | |
4530 | val, (long)memaddr); | |
0d62e5e8 DJ |
4531 | } |
4532 | ||
da6d8c04 DJ |
4533 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
4534 | ||
93ae6fdc | 4535 | errno = 0; |
14ce3065 DE |
4536 | /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning |
4537 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
4538 | buffer[0] = ptrace (PTRACE_PEEKTEXT, pid, | |
b8e1b30e LM |
4539 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4540 | (PTRACE_TYPE_ARG4) 0); | |
93ae6fdc PA |
4541 | if (errno) |
4542 | return errno; | |
da6d8c04 DJ |
4543 | |
4544 | if (count > 1) | |
4545 | { | |
93ae6fdc | 4546 | errno = 0; |
da6d8c04 | 4547 | buffer[count - 1] |
95954743 | 4548 | = ptrace (PTRACE_PEEKTEXT, pid, |
14ce3065 DE |
4549 | /* Coerce to a uintptr_t first to avoid potential gcc warning |
4550 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e | 4551 | (PTRACE_TYPE_ARG3) (uintptr_t) (addr + (count - 1) |
14ce3065 | 4552 | * sizeof (PTRACE_XFER_TYPE)), |
b8e1b30e | 4553 | (PTRACE_TYPE_ARG4) 0); |
93ae6fdc PA |
4554 | if (errno) |
4555 | return errno; | |
da6d8c04 DJ |
4556 | } |
4557 | ||
93ae6fdc | 4558 | /* Copy data to be written over corresponding part of buffer. */ |
da6d8c04 | 4559 | |
493e2a69 MS |
4560 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), |
4561 | myaddr, len); | |
da6d8c04 DJ |
4562 | |
4563 | /* Write the entire buffer. */ | |
4564 | ||
4565 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) | |
4566 | { | |
4567 | errno = 0; | |
14ce3065 DE |
4568 | ptrace (PTRACE_POKETEXT, pid, |
4569 | /* Coerce to a uintptr_t first to avoid potential gcc warning | |
4570 | about coercing an 8 byte integer to a 4 byte pointer. */ | |
b8e1b30e LM |
4571 | (PTRACE_TYPE_ARG3) (uintptr_t) addr, |
4572 | (PTRACE_TYPE_ARG4) buffer[i]); | |
da6d8c04 DJ |
4573 | if (errno) |
4574 | return errno; | |
4575 | } | |
4576 | ||
4577 | return 0; | |
4578 | } | |
2f2893d9 DJ |
4579 | |
4580 | static void | |
4581 | linux_look_up_symbols (void) | |
4582 | { | |
0d62e5e8 | 4583 | #ifdef USE_THREAD_DB |
95954743 PA |
4584 | struct process_info *proc = current_process (); |
4585 | ||
cdbfd419 | 4586 | if (proc->private->thread_db != NULL) |
0d62e5e8 DJ |
4587 | return; |
4588 | ||
96d7229d LM |
4589 | /* If the kernel supports tracing clones, then we don't need to |
4590 | use the magic thread event breakpoint to learn about | |
4591 | threads. */ | |
4592 | thread_db_init (!linux_supports_traceclone ()); | |
0d62e5e8 DJ |
4593 | #endif |
4594 | } | |
4595 | ||
e5379b03 | 4596 | static void |
ef57601b | 4597 | linux_request_interrupt (void) |
e5379b03 | 4598 | { |
a1928bad | 4599 | extern unsigned long signal_pid; |
e5379b03 | 4600 | |
95954743 PA |
4601 | if (!ptid_equal (cont_thread, null_ptid) |
4602 | && !ptid_equal (cont_thread, minus_one_ptid)) | |
e5379b03 | 4603 | { |
54a0b537 | 4604 | struct lwp_info *lwp; |
bd99dc85 | 4605 | int lwpid; |
e5379b03 | 4606 | |
54a0b537 | 4607 | lwp = get_thread_lwp (current_inferior); |
bd99dc85 PA |
4608 | lwpid = lwpid_of (lwp); |
4609 | kill_lwp (lwpid, SIGINT); | |
e5379b03 DJ |
4610 | } |
4611 | else | |
ef57601b | 4612 | kill_lwp (signal_pid, SIGINT); |
e5379b03 DJ |
4613 | } |
4614 | ||
aa691b87 RM |
4615 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
4616 | to debugger memory starting at MYADDR. */ | |
4617 | ||
4618 | static int | |
f450004a | 4619 | linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
aa691b87 RM |
4620 | { |
4621 | char filename[PATH_MAX]; | |
4622 | int fd, n; | |
95954743 | 4623 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
aa691b87 | 4624 | |
6cebaf6e | 4625 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); |
aa691b87 RM |
4626 | |
4627 | fd = open (filename, O_RDONLY); | |
4628 | if (fd < 0) | |
4629 | return -1; | |
4630 | ||
4631 | if (offset != (CORE_ADDR) 0 | |
4632 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
4633 | n = -1; | |
4634 | else | |
4635 | n = read (fd, myaddr, len); | |
4636 | ||
4637 | close (fd); | |
4638 | ||
4639 | return n; | |
4640 | } | |
4641 | ||
d993e290 PA |
4642 | /* These breakpoint and watchpoint related wrapper functions simply |
4643 | pass on the function call if the target has registered a | |
4644 | corresponding function. */ | |
e013ee27 OF |
4645 | |
4646 | static int | |
d993e290 | 4647 | linux_insert_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4648 | { |
d993e290 PA |
4649 | if (the_low_target.insert_point != NULL) |
4650 | return the_low_target.insert_point (type, addr, len); | |
e013ee27 OF |
4651 | else |
4652 | /* Unsupported (see target.h). */ | |
4653 | return 1; | |
4654 | } | |
4655 | ||
4656 | static int | |
d993e290 | 4657 | linux_remove_point (char type, CORE_ADDR addr, int len) |
e013ee27 | 4658 | { |
d993e290 PA |
4659 | if (the_low_target.remove_point != NULL) |
4660 | return the_low_target.remove_point (type, addr, len); | |
e013ee27 OF |
4661 | else |
4662 | /* Unsupported (see target.h). */ | |
4663 | return 1; | |
4664 | } | |
4665 | ||
4666 | static int | |
4667 | linux_stopped_by_watchpoint (void) | |
4668 | { | |
c3adc08c PA |
4669 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4670 | ||
4671 | return lwp->stopped_by_watchpoint; | |
e013ee27 OF |
4672 | } |
4673 | ||
4674 | static CORE_ADDR | |
4675 | linux_stopped_data_address (void) | |
4676 | { | |
c3adc08c PA |
4677 | struct lwp_info *lwp = get_thread_lwp (current_inferior); |
4678 | ||
4679 | return lwp->stopped_data_address; | |
e013ee27 OF |
4680 | } |
4681 | ||
db0dfaa0 LM |
4682 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
4683 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
4684 | && defined(PT_TEXT_END_ADDR) | |
4685 | ||
4686 | /* This is only used for targets that define PT_TEXT_ADDR, | |
4687 | PT_DATA_ADDR and PT_TEXT_END_ADDR. If those are not defined, supposedly | |
4688 | the target has different ways of acquiring this information, like | |
4689 | loadmaps. */ | |
52fb6437 NS |
4690 | |
4691 | /* Under uClinux, programs are loaded at non-zero offsets, which we need | |
4692 | to tell gdb about. */ | |
4693 | ||
4694 | static int | |
4695 | linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p) | |
4696 | { | |
52fb6437 | 4697 | unsigned long text, text_end, data; |
bd99dc85 | 4698 | int pid = lwpid_of (get_thread_lwp (current_inferior)); |
52fb6437 NS |
4699 | |
4700 | errno = 0; | |
4701 | ||
b8e1b30e LM |
4702 | text = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_ADDR, |
4703 | (PTRACE_TYPE_ARG4) 0); | |
4704 | text_end = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_TEXT_END_ADDR, | |
4705 | (PTRACE_TYPE_ARG4) 0); | |
4706 | data = ptrace (PTRACE_PEEKUSER, pid, (PTRACE_TYPE_ARG3) PT_DATA_ADDR, | |
4707 | (PTRACE_TYPE_ARG4) 0); | |
52fb6437 NS |
4708 | |
4709 | if (errno == 0) | |
4710 | { | |
4711 | /* Both text and data offsets produced at compile-time (and so | |
1b3f6016 PA |
4712 | used by gdb) are relative to the beginning of the program, |
4713 | with the data segment immediately following the text segment. | |
4714 | However, the actual runtime layout in memory may put the data | |
4715 | somewhere else, so when we send gdb a data base-address, we | |
4716 | use the real data base address and subtract the compile-time | |
4717 | data base-address from it (which is just the length of the | |
4718 | text segment). BSS immediately follows data in both | |
4719 | cases. */ | |
52fb6437 NS |
4720 | *text_p = text; |
4721 | *data_p = data - (text_end - text); | |
1b3f6016 | 4722 | |
52fb6437 NS |
4723 | return 1; |
4724 | } | |
52fb6437 NS |
4725 | return 0; |
4726 | } | |
4727 | #endif | |
4728 | ||
07e059b5 VP |
4729 | static int |
4730 | linux_qxfer_osdata (const char *annex, | |
1b3f6016 PA |
4731 | unsigned char *readbuf, unsigned const char *writebuf, |
4732 | CORE_ADDR offset, int len) | |
07e059b5 | 4733 | { |
d26e3629 | 4734 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
4735 | } |
4736 | ||
d0722149 DE |
4737 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4738 | layout of the inferiors' architecture. */ | |
4739 | ||
4740 | static void | |
a5362b9a | 4741 | siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction) |
d0722149 DE |
4742 | { |
4743 | int done = 0; | |
4744 | ||
4745 | if (the_low_target.siginfo_fixup != NULL) | |
4746 | done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction); | |
4747 | ||
4748 | /* If there was no callback, or the callback didn't do anything, | |
4749 | then just do a straight memcpy. */ | |
4750 | if (!done) | |
4751 | { | |
4752 | if (direction == 1) | |
a5362b9a | 4753 | memcpy (siginfo, inf_siginfo, sizeof (siginfo_t)); |
d0722149 | 4754 | else |
a5362b9a | 4755 | memcpy (inf_siginfo, siginfo, sizeof (siginfo_t)); |
d0722149 DE |
4756 | } |
4757 | } | |
4758 | ||
4aa995e1 PA |
4759 | static int |
4760 | linux_xfer_siginfo (const char *annex, unsigned char *readbuf, | |
4761 | unsigned const char *writebuf, CORE_ADDR offset, int len) | |
4762 | { | |
d0722149 | 4763 | int pid; |
a5362b9a TS |
4764 | siginfo_t siginfo; |
4765 | char inf_siginfo[sizeof (siginfo_t)]; | |
4aa995e1 PA |
4766 | |
4767 | if (current_inferior == NULL) | |
4768 | return -1; | |
4769 | ||
bd99dc85 | 4770 | pid = lwpid_of (get_thread_lwp (current_inferior)); |
4aa995e1 PA |
4771 | |
4772 | if (debug_threads) | |
d0722149 | 4773 | fprintf (stderr, "%s siginfo for lwp %d.\n", |
4aa995e1 PA |
4774 | readbuf != NULL ? "Reading" : "Writing", |
4775 | pid); | |
4776 | ||
0adea5f7 | 4777 | if (offset >= sizeof (siginfo)) |
4aa995e1 PA |
4778 | return -1; |
4779 | ||
b8e1b30e | 4780 | if (ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4781 | return -1; |
4782 | ||
d0722149 DE |
4783 | /* When GDBSERVER is built as a 64-bit application, ptrace writes into |
4784 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4785 | inferior with a 64-bit GDBSERVER should look the same as debugging it | |
4786 | with a 32-bit GDBSERVER, we need to convert it. */ | |
4787 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4788 | ||
4aa995e1 PA |
4789 | if (offset + len > sizeof (siginfo)) |
4790 | len = sizeof (siginfo) - offset; | |
4791 | ||
4792 | if (readbuf != NULL) | |
d0722149 | 4793 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4794 | else |
4795 | { | |
d0722149 DE |
4796 | memcpy (inf_siginfo + offset, writebuf, len); |
4797 | ||
4798 | /* Convert back to ptrace layout before flushing it out. */ | |
4799 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4800 | ||
b8e1b30e | 4801 | if (ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo) != 0) |
4aa995e1 PA |
4802 | return -1; |
4803 | } | |
4804 | ||
4805 | return len; | |
4806 | } | |
4807 | ||
bd99dc85 PA |
4808 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4809 | so we notice when children change state; as the handler for the | |
4810 | sigsuspend in my_waitpid. */ | |
4811 | ||
4812 | static void | |
4813 | sigchld_handler (int signo) | |
4814 | { | |
4815 | int old_errno = errno; | |
4816 | ||
4817 | if (debug_threads) | |
e581f2b4 PA |
4818 | { |
4819 | do | |
4820 | { | |
4821 | /* fprintf is not async-signal-safe, so call write | |
4822 | directly. */ | |
4823 | if (write (2, "sigchld_handler\n", | |
4824 | sizeof ("sigchld_handler\n") - 1) < 0) | |
4825 | break; /* just ignore */ | |
4826 | } while (0); | |
4827 | } | |
bd99dc85 PA |
4828 | |
4829 | if (target_is_async_p ()) | |
4830 | async_file_mark (); /* trigger a linux_wait */ | |
4831 | ||
4832 | errno = old_errno; | |
4833 | } | |
4834 | ||
4835 | static int | |
4836 | linux_supports_non_stop (void) | |
4837 | { | |
4838 | return 1; | |
4839 | } | |
4840 | ||
4841 | static int | |
4842 | linux_async (int enable) | |
4843 | { | |
4844 | int previous = (linux_event_pipe[0] != -1); | |
4845 | ||
8336d594 PA |
4846 | if (debug_threads) |
4847 | fprintf (stderr, "linux_async (%d), previous=%d\n", | |
4848 | enable, previous); | |
4849 | ||
bd99dc85 PA |
4850 | if (previous != enable) |
4851 | { | |
4852 | sigset_t mask; | |
4853 | sigemptyset (&mask); | |
4854 | sigaddset (&mask, SIGCHLD); | |
4855 | ||
4856 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4857 | ||
4858 | if (enable) | |
4859 | { | |
4860 | if (pipe (linux_event_pipe) == -1) | |
4861 | fatal ("creating event pipe failed."); | |
4862 | ||
4863 | fcntl (linux_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4864 | fcntl (linux_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4865 | ||
4866 | /* Register the event loop handler. */ | |
4867 | add_file_handler (linux_event_pipe[0], | |
4868 | handle_target_event, NULL); | |
4869 | ||
4870 | /* Always trigger a linux_wait. */ | |
4871 | async_file_mark (); | |
4872 | } | |
4873 | else | |
4874 | { | |
4875 | delete_file_handler (linux_event_pipe[0]); | |
4876 | ||
4877 | close (linux_event_pipe[0]); | |
4878 | close (linux_event_pipe[1]); | |
4879 | linux_event_pipe[0] = -1; | |
4880 | linux_event_pipe[1] = -1; | |
4881 | } | |
4882 | ||
4883 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4884 | } | |
4885 | ||
4886 | return previous; | |
4887 | } | |
4888 | ||
4889 | static int | |
4890 | linux_start_non_stop (int nonstop) | |
4891 | { | |
4892 | /* Register or unregister from event-loop accordingly. */ | |
4893 | linux_async (nonstop); | |
4894 | return 0; | |
4895 | } | |
4896 | ||
cf8fd78b PA |
4897 | static int |
4898 | linux_supports_multi_process (void) | |
4899 | { | |
4900 | return 1; | |
4901 | } | |
4902 | ||
03583c20 UW |
4903 | static int |
4904 | linux_supports_disable_randomization (void) | |
4905 | { | |
4906 | #ifdef HAVE_PERSONALITY | |
4907 | return 1; | |
4908 | #else | |
4909 | return 0; | |
4910 | #endif | |
4911 | } | |
efcbbd14 | 4912 | |
d1feda86 YQ |
4913 | static int |
4914 | linux_supports_agent (void) | |
4915 | { | |
4916 | return 1; | |
4917 | } | |
4918 | ||
c2d6af84 PA |
4919 | static int |
4920 | linux_supports_range_stepping (void) | |
4921 | { | |
4922 | if (*the_low_target.supports_range_stepping == NULL) | |
4923 | return 0; | |
4924 | ||
4925 | return (*the_low_target.supports_range_stepping) (); | |
4926 | } | |
4927 | ||
efcbbd14 UW |
4928 | /* Enumerate spufs IDs for process PID. */ |
4929 | static int | |
4930 | spu_enumerate_spu_ids (long pid, unsigned char *buf, CORE_ADDR offset, int len) | |
4931 | { | |
4932 | int pos = 0; | |
4933 | int written = 0; | |
4934 | char path[128]; | |
4935 | DIR *dir; | |
4936 | struct dirent *entry; | |
4937 | ||
4938 | sprintf (path, "/proc/%ld/fd", pid); | |
4939 | dir = opendir (path); | |
4940 | if (!dir) | |
4941 | return -1; | |
4942 | ||
4943 | rewinddir (dir); | |
4944 | while ((entry = readdir (dir)) != NULL) | |
4945 | { | |
4946 | struct stat st; | |
4947 | struct statfs stfs; | |
4948 | int fd; | |
4949 | ||
4950 | fd = atoi (entry->d_name); | |
4951 | if (!fd) | |
4952 | continue; | |
4953 | ||
4954 | sprintf (path, "/proc/%ld/fd/%d", pid, fd); | |
4955 | if (stat (path, &st) != 0) | |
4956 | continue; | |
4957 | if (!S_ISDIR (st.st_mode)) | |
4958 | continue; | |
4959 | ||
4960 | if (statfs (path, &stfs) != 0) | |
4961 | continue; | |
4962 | if (stfs.f_type != SPUFS_MAGIC) | |
4963 | continue; | |
4964 | ||
4965 | if (pos >= offset && pos + 4 <= offset + len) | |
4966 | { | |
4967 | *(unsigned int *)(buf + pos - offset) = fd; | |
4968 | written += 4; | |
4969 | } | |
4970 | pos += 4; | |
4971 | } | |
4972 | ||
4973 | closedir (dir); | |
4974 | return written; | |
4975 | } | |
4976 | ||
4977 | /* Implements the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
4978 | object type, using the /proc file system. */ | |
4979 | static int | |
4980 | linux_qxfer_spu (const char *annex, unsigned char *readbuf, | |
4981 | unsigned const char *writebuf, | |
4982 | CORE_ADDR offset, int len) | |
4983 | { | |
4984 | long pid = lwpid_of (get_thread_lwp (current_inferior)); | |
4985 | char buf[128]; | |
4986 | int fd = 0; | |
4987 | int ret = 0; | |
4988 | ||
4989 | if (!writebuf && !readbuf) | |
4990 | return -1; | |
4991 | ||
4992 | if (!*annex) | |
4993 | { | |
4994 | if (!readbuf) | |
4995 | return -1; | |
4996 | else | |
4997 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
4998 | } | |
4999 | ||
5000 | sprintf (buf, "/proc/%ld/fd/%s", pid, annex); | |
5001 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5002 | if (fd <= 0) | |
5003 | return -1; | |
5004 | ||
5005 | if (offset != 0 | |
5006 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5007 | { | |
5008 | close (fd); | |
5009 | return 0; | |
5010 | } | |
5011 | ||
5012 | if (writebuf) | |
5013 | ret = write (fd, writebuf, (size_t) len); | |
5014 | else | |
5015 | ret = read (fd, readbuf, (size_t) len); | |
5016 | ||
5017 | close (fd); | |
5018 | return ret; | |
5019 | } | |
5020 | ||
723b724b | 5021 | #if defined PT_GETDSBT || defined PTRACE_GETFDPIC |
78d85199 YQ |
5022 | struct target_loadseg |
5023 | { | |
5024 | /* Core address to which the segment is mapped. */ | |
5025 | Elf32_Addr addr; | |
5026 | /* VMA recorded in the program header. */ | |
5027 | Elf32_Addr p_vaddr; | |
5028 | /* Size of this segment in memory. */ | |
5029 | Elf32_Word p_memsz; | |
5030 | }; | |
5031 | ||
723b724b | 5032 | # if defined PT_GETDSBT |
78d85199 YQ |
5033 | struct target_loadmap |
5034 | { | |
5035 | /* Protocol version number, must be zero. */ | |
5036 | Elf32_Word version; | |
5037 | /* Pointer to the DSBT table, its size, and the DSBT index. */ | |
5038 | unsigned *dsbt_table; | |
5039 | unsigned dsbt_size, dsbt_index; | |
5040 | /* Number of segments in this map. */ | |
5041 | Elf32_Word nsegs; | |
5042 | /* The actual memory map. */ | |
5043 | struct target_loadseg segs[/*nsegs*/]; | |
5044 | }; | |
723b724b MF |
5045 | # define LINUX_LOADMAP PT_GETDSBT |
5046 | # define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC | |
5047 | # define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP | |
5048 | # else | |
5049 | struct target_loadmap | |
5050 | { | |
5051 | /* Protocol version number, must be zero. */ | |
5052 | Elf32_Half version; | |
5053 | /* Number of segments in this map. */ | |
5054 | Elf32_Half nsegs; | |
5055 | /* The actual memory map. */ | |
5056 | struct target_loadseg segs[/*nsegs*/]; | |
5057 | }; | |
5058 | # define LINUX_LOADMAP PTRACE_GETFDPIC | |
5059 | # define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC | |
5060 | # define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP | |
5061 | # endif | |
78d85199 | 5062 | |
78d85199 YQ |
5063 | static int |
5064 | linux_read_loadmap (const char *annex, CORE_ADDR offset, | |
5065 | unsigned char *myaddr, unsigned int len) | |
5066 | { | |
5067 | int pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5068 | int addr = -1; | |
5069 | struct target_loadmap *data = NULL; | |
5070 | unsigned int actual_length, copy_length; | |
5071 | ||
5072 | if (strcmp (annex, "exec") == 0) | |
723b724b | 5073 | addr = (int) LINUX_LOADMAP_EXEC; |
78d85199 | 5074 | else if (strcmp (annex, "interp") == 0) |
723b724b | 5075 | addr = (int) LINUX_LOADMAP_INTERP; |
78d85199 YQ |
5076 | else |
5077 | return -1; | |
5078 | ||
723b724b | 5079 | if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0) |
78d85199 YQ |
5080 | return -1; |
5081 | ||
5082 | if (data == NULL) | |
5083 | return -1; | |
5084 | ||
5085 | actual_length = sizeof (struct target_loadmap) | |
5086 | + sizeof (struct target_loadseg) * data->nsegs; | |
5087 | ||
5088 | if (offset < 0 || offset > actual_length) | |
5089 | return -1; | |
5090 | ||
5091 | copy_length = actual_length - offset < len ? actual_length - offset : len; | |
5092 | memcpy (myaddr, (char *) data + offset, copy_length); | |
5093 | return copy_length; | |
5094 | } | |
723b724b MF |
5095 | #else |
5096 | # define linux_read_loadmap NULL | |
5097 | #endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */ | |
78d85199 | 5098 | |
1570b33e L |
5099 | static void |
5100 | linux_process_qsupported (const char *query) | |
5101 | { | |
5102 | if (the_low_target.process_qsupported != NULL) | |
5103 | the_low_target.process_qsupported (query); | |
5104 | } | |
5105 | ||
219f2f23 PA |
5106 | static int |
5107 | linux_supports_tracepoints (void) | |
5108 | { | |
5109 | if (*the_low_target.supports_tracepoints == NULL) | |
5110 | return 0; | |
5111 | ||
5112 | return (*the_low_target.supports_tracepoints) (); | |
5113 | } | |
5114 | ||
5115 | static CORE_ADDR | |
5116 | linux_read_pc (struct regcache *regcache) | |
5117 | { | |
5118 | if (the_low_target.get_pc == NULL) | |
5119 | return 0; | |
5120 | ||
5121 | return (*the_low_target.get_pc) (regcache); | |
5122 | } | |
5123 | ||
5124 | static void | |
5125 | linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
5126 | { | |
5127 | gdb_assert (the_low_target.set_pc != NULL); | |
5128 | ||
5129 | (*the_low_target.set_pc) (regcache, pc); | |
5130 | } | |
5131 | ||
8336d594 PA |
5132 | static int |
5133 | linux_thread_stopped (struct thread_info *thread) | |
5134 | { | |
5135 | return get_thread_lwp (thread)->stopped; | |
5136 | } | |
5137 | ||
5138 | /* This exposes stop-all-threads functionality to other modules. */ | |
5139 | ||
5140 | static void | |
7984d532 | 5141 | linux_pause_all (int freeze) |
8336d594 | 5142 | { |
7984d532 PA |
5143 | stop_all_lwps (freeze, NULL); |
5144 | } | |
5145 | ||
5146 | /* This exposes unstop-all-threads functionality to other gdbserver | |
5147 | modules. */ | |
5148 | ||
5149 | static void | |
5150 | linux_unpause_all (int unfreeze) | |
5151 | { | |
5152 | unstop_all_lwps (unfreeze, NULL); | |
8336d594 PA |
5153 | } |
5154 | ||
90d74c30 PA |
5155 | static int |
5156 | linux_prepare_to_access_memory (void) | |
5157 | { | |
5158 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5159 | running LWP. */ | |
5160 | if (non_stop) | |
5161 | linux_pause_all (1); | |
5162 | return 0; | |
5163 | } | |
5164 | ||
5165 | static void | |
0146f85b | 5166 | linux_done_accessing_memory (void) |
90d74c30 PA |
5167 | { |
5168 | /* Neither ptrace nor /proc/PID/mem allow accessing memory through a | |
5169 | running LWP. */ | |
5170 | if (non_stop) | |
5171 | linux_unpause_all (1); | |
5172 | } | |
5173 | ||
fa593d66 PA |
5174 | static int |
5175 | linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr, | |
5176 | CORE_ADDR collector, | |
5177 | CORE_ADDR lockaddr, | |
5178 | ULONGEST orig_size, | |
5179 | CORE_ADDR *jump_entry, | |
405f8e94 SS |
5180 | CORE_ADDR *trampoline, |
5181 | ULONGEST *trampoline_size, | |
fa593d66 PA |
5182 | unsigned char *jjump_pad_insn, |
5183 | ULONGEST *jjump_pad_insn_size, | |
5184 | CORE_ADDR *adjusted_insn_addr, | |
405f8e94 SS |
5185 | CORE_ADDR *adjusted_insn_addr_end, |
5186 | char *err) | |
fa593d66 PA |
5187 | { |
5188 | return (*the_low_target.install_fast_tracepoint_jump_pad) | |
5189 | (tpoint, tpaddr, collector, lockaddr, orig_size, | |
405f8e94 SS |
5190 | jump_entry, trampoline, trampoline_size, |
5191 | jjump_pad_insn, jjump_pad_insn_size, | |
5192 | adjusted_insn_addr, adjusted_insn_addr_end, | |
5193 | err); | |
fa593d66 PA |
5194 | } |
5195 | ||
6a271cae PA |
5196 | static struct emit_ops * |
5197 | linux_emit_ops (void) | |
5198 | { | |
5199 | if (the_low_target.emit_ops != NULL) | |
5200 | return (*the_low_target.emit_ops) (); | |
5201 | else | |
5202 | return NULL; | |
5203 | } | |
5204 | ||
405f8e94 SS |
5205 | static int |
5206 | linux_get_min_fast_tracepoint_insn_len (void) | |
5207 | { | |
5208 | return (*the_low_target.get_min_fast_tracepoint_insn_len) (); | |
5209 | } | |
5210 | ||
2268b414 JK |
5211 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ |
5212 | ||
5213 | static int | |
5214 | get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64, | |
5215 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
5216 | { | |
5217 | char filename[PATH_MAX]; | |
5218 | int fd; | |
5219 | const int auxv_size = is_elf64 | |
5220 | ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t); | |
5221 | char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */ | |
5222 | ||
5223 | xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid); | |
5224 | ||
5225 | fd = open (filename, O_RDONLY); | |
5226 | if (fd < 0) | |
5227 | return 1; | |
5228 | ||
5229 | *phdr_memaddr = 0; | |
5230 | *num_phdr = 0; | |
5231 | while (read (fd, buf, auxv_size) == auxv_size | |
5232 | && (*phdr_memaddr == 0 || *num_phdr == 0)) | |
5233 | { | |
5234 | if (is_elf64) | |
5235 | { | |
5236 | Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf; | |
5237 | ||
5238 | switch (aux->a_type) | |
5239 | { | |
5240 | case AT_PHDR: | |
5241 | *phdr_memaddr = aux->a_un.a_val; | |
5242 | break; | |
5243 | case AT_PHNUM: | |
5244 | *num_phdr = aux->a_un.a_val; | |
5245 | break; | |
5246 | } | |
5247 | } | |
5248 | else | |
5249 | { | |
5250 | Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf; | |
5251 | ||
5252 | switch (aux->a_type) | |
5253 | { | |
5254 | case AT_PHDR: | |
5255 | *phdr_memaddr = aux->a_un.a_val; | |
5256 | break; | |
5257 | case AT_PHNUM: | |
5258 | *num_phdr = aux->a_un.a_val; | |
5259 | break; | |
5260 | } | |
5261 | } | |
5262 | } | |
5263 | ||
5264 | close (fd); | |
5265 | ||
5266 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
5267 | { | |
5268 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
5269 | "phdr_memaddr = %ld, phdr_num = %d", | |
5270 | (long) *phdr_memaddr, *num_phdr); | |
5271 | return 2; | |
5272 | } | |
5273 | ||
5274 | return 0; | |
5275 | } | |
5276 | ||
5277 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
5278 | ||
5279 | static CORE_ADDR | |
5280 | get_dynamic (const int pid, const int is_elf64) | |
5281 | { | |
5282 | CORE_ADDR phdr_memaddr, relocation; | |
5283 | int num_phdr, i; | |
5284 | unsigned char *phdr_buf; | |
5285 | const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr); | |
5286 | ||
5287 | if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr)) | |
5288 | return 0; | |
5289 | ||
5290 | gdb_assert (num_phdr < 100); /* Basic sanity check. */ | |
5291 | phdr_buf = alloca (num_phdr * phdr_size); | |
5292 | ||
5293 | if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size)) | |
5294 | return 0; | |
5295 | ||
5296 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
5297 | non-zero for PIE ones. */ | |
5298 | relocation = -1; | |
5299 | for (i = 0; relocation == -1 && i < num_phdr; i++) | |
5300 | if (is_elf64) | |
5301 | { | |
5302 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5303 | ||
5304 | if (p->p_type == PT_PHDR) | |
5305 | relocation = phdr_memaddr - p->p_vaddr; | |
5306 | } | |
5307 | else | |
5308 | { | |
5309 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5310 | ||
5311 | if (p->p_type == PT_PHDR) | |
5312 | relocation = phdr_memaddr - p->p_vaddr; | |
5313 | } | |
5314 | ||
5315 | if (relocation == -1) | |
5316 | { | |
e237a7e2 JK |
5317 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately |
5318 | any real world executables, including PIE executables, have always | |
5319 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
5320 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
5321 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
5322 | ||
5323 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
5324 | ||
5325 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
5326 | ||
2268b414 JK |
5327 | return 0; |
5328 | } | |
5329 | ||
5330 | for (i = 0; i < num_phdr; i++) | |
5331 | { | |
5332 | if (is_elf64) | |
5333 | { | |
5334 | Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size); | |
5335 | ||
5336 | if (p->p_type == PT_DYNAMIC) | |
5337 | return p->p_vaddr + relocation; | |
5338 | } | |
5339 | else | |
5340 | { | |
5341 | Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size); | |
5342 | ||
5343 | if (p->p_type == PT_DYNAMIC) | |
5344 | return p->p_vaddr + relocation; | |
5345 | } | |
5346 | } | |
5347 | ||
5348 | return 0; | |
5349 | } | |
5350 | ||
5351 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
367ba2c2 MR |
5352 | can be 0 if the inferior does not yet have the library list initialized. |
5353 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
5354 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
2268b414 JK |
5355 | |
5356 | static CORE_ADDR | |
5357 | get_r_debug (const int pid, const int is_elf64) | |
5358 | { | |
5359 | CORE_ADDR dynamic_memaddr; | |
5360 | const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn); | |
5361 | unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */ | |
367ba2c2 | 5362 | CORE_ADDR map = -1; |
2268b414 JK |
5363 | |
5364 | dynamic_memaddr = get_dynamic (pid, is_elf64); | |
5365 | if (dynamic_memaddr == 0) | |
367ba2c2 | 5366 | return map; |
2268b414 JK |
5367 | |
5368 | while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
5369 | { | |
5370 | if (is_elf64) | |
5371 | { | |
5372 | Elf64_Dyn *const dyn = (Elf64_Dyn *) buf; | |
75f62ce7 | 5373 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5374 | union |
5375 | { | |
5376 | Elf64_Xword map; | |
5377 | unsigned char buf[sizeof (Elf64_Xword)]; | |
5378 | } | |
5379 | rld_map; | |
5380 | ||
5381 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5382 | { | |
5383 | if (linux_read_memory (dyn->d_un.d_val, | |
5384 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5385 | return rld_map.map; | |
5386 | else | |
5387 | break; | |
5388 | } | |
75f62ce7 | 5389 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5390 | |
367ba2c2 MR |
5391 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5392 | map = dyn->d_un.d_val; | |
2268b414 JK |
5393 | |
5394 | if (dyn->d_tag == DT_NULL) | |
5395 | break; | |
5396 | } | |
5397 | else | |
5398 | { | |
5399 | Elf32_Dyn *const dyn = (Elf32_Dyn *) buf; | |
75f62ce7 | 5400 | #ifdef DT_MIPS_RLD_MAP |
367ba2c2 MR |
5401 | union |
5402 | { | |
5403 | Elf32_Word map; | |
5404 | unsigned char buf[sizeof (Elf32_Word)]; | |
5405 | } | |
5406 | rld_map; | |
5407 | ||
5408 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
5409 | { | |
5410 | if (linux_read_memory (dyn->d_un.d_val, | |
5411 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
5412 | return rld_map.map; | |
5413 | else | |
5414 | break; | |
5415 | } | |
75f62ce7 | 5416 | #endif /* DT_MIPS_RLD_MAP */ |
2268b414 | 5417 | |
367ba2c2 MR |
5418 | if (dyn->d_tag == DT_DEBUG && map == -1) |
5419 | map = dyn->d_un.d_val; | |
2268b414 JK |
5420 | |
5421 | if (dyn->d_tag == DT_NULL) | |
5422 | break; | |
5423 | } | |
5424 | ||
5425 | dynamic_memaddr += dyn_size; | |
5426 | } | |
5427 | ||
367ba2c2 | 5428 | return map; |
2268b414 JK |
5429 | } |
5430 | ||
5431 | /* Read one pointer from MEMADDR in the inferior. */ | |
5432 | ||
5433 | static int | |
5434 | read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size) | |
5435 | { | |
485f1ee4 PA |
5436 | int ret; |
5437 | ||
5438 | /* Go through a union so this works on either big or little endian | |
5439 | hosts, when the inferior's pointer size is smaller than the size | |
5440 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
5441 | same of the superior's. */ | |
5442 | union | |
5443 | { | |
5444 | CORE_ADDR core_addr; | |
5445 | unsigned int ui; | |
5446 | unsigned char uc; | |
5447 | } addr; | |
5448 | ||
5449 | ret = linux_read_memory (memaddr, &addr.uc, ptr_size); | |
5450 | if (ret == 0) | |
5451 | { | |
5452 | if (ptr_size == sizeof (CORE_ADDR)) | |
5453 | *ptr = addr.core_addr; | |
5454 | else if (ptr_size == sizeof (unsigned int)) | |
5455 | *ptr = addr.ui; | |
5456 | else | |
5457 | gdb_assert_not_reached ("unhandled pointer size"); | |
5458 | } | |
5459 | return ret; | |
2268b414 JK |
5460 | } |
5461 | ||
5462 | struct link_map_offsets | |
5463 | { | |
5464 | /* Offset and size of r_debug.r_version. */ | |
5465 | int r_version_offset; | |
5466 | ||
5467 | /* Offset and size of r_debug.r_map. */ | |
5468 | int r_map_offset; | |
5469 | ||
5470 | /* Offset to l_addr field in struct link_map. */ | |
5471 | int l_addr_offset; | |
5472 | ||
5473 | /* Offset to l_name field in struct link_map. */ | |
5474 | int l_name_offset; | |
5475 | ||
5476 | /* Offset to l_ld field in struct link_map. */ | |
5477 | int l_ld_offset; | |
5478 | ||
5479 | /* Offset to l_next field in struct link_map. */ | |
5480 | int l_next_offset; | |
5481 | ||
5482 | /* Offset to l_prev field in struct link_map. */ | |
5483 | int l_prev_offset; | |
5484 | }; | |
5485 | ||
fb723180 | 5486 | /* Construct qXfer:libraries-svr4:read reply. */ |
2268b414 JK |
5487 | |
5488 | static int | |
5489 | linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf, | |
5490 | unsigned const char *writebuf, | |
5491 | CORE_ADDR offset, int len) | |
5492 | { | |
5493 | char *document; | |
5494 | unsigned document_len; | |
5495 | struct process_info_private *const priv = current_process ()->private; | |
5496 | char filename[PATH_MAX]; | |
5497 | int pid, is_elf64; | |
5498 | ||
5499 | static const struct link_map_offsets lmo_32bit_offsets = | |
5500 | { | |
5501 | 0, /* r_version offset. */ | |
5502 | 4, /* r_debug.r_map offset. */ | |
5503 | 0, /* l_addr offset in link_map. */ | |
5504 | 4, /* l_name offset in link_map. */ | |
5505 | 8, /* l_ld offset in link_map. */ | |
5506 | 12, /* l_next offset in link_map. */ | |
5507 | 16 /* l_prev offset in link_map. */ | |
5508 | }; | |
5509 | ||
5510 | static const struct link_map_offsets lmo_64bit_offsets = | |
5511 | { | |
5512 | 0, /* r_version offset. */ | |
5513 | 8, /* r_debug.r_map offset. */ | |
5514 | 0, /* l_addr offset in link_map. */ | |
5515 | 8, /* l_name offset in link_map. */ | |
5516 | 16, /* l_ld offset in link_map. */ | |
5517 | 24, /* l_next offset in link_map. */ | |
5518 | 32 /* l_prev offset in link_map. */ | |
5519 | }; | |
5520 | const struct link_map_offsets *lmo; | |
214d508e | 5521 | unsigned int machine; |
b1fbec62 GB |
5522 | int ptr_size; |
5523 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
5524 | int allocated = 1024; | |
5525 | char *p; | |
5526 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
5527 | int header_done = 0; | |
2268b414 JK |
5528 | |
5529 | if (writebuf != NULL) | |
5530 | return -2; | |
5531 | if (readbuf == NULL) | |
5532 | return -1; | |
5533 | ||
5534 | pid = lwpid_of (get_thread_lwp (current_inferior)); | |
5535 | xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid); | |
214d508e | 5536 | is_elf64 = elf_64_file_p (filename, &machine); |
2268b414 | 5537 | lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets; |
b1fbec62 | 5538 | ptr_size = is_elf64 ? 8 : 4; |
2268b414 | 5539 | |
b1fbec62 GB |
5540 | while (annex[0] != '\0') |
5541 | { | |
5542 | const char *sep; | |
5543 | CORE_ADDR *addrp; | |
5544 | int len; | |
2268b414 | 5545 | |
b1fbec62 GB |
5546 | sep = strchr (annex, '='); |
5547 | if (sep == NULL) | |
5548 | break; | |
0c5bf5a9 | 5549 | |
b1fbec62 GB |
5550 | len = sep - annex; |
5551 | if (len == 5 && strncmp (annex, "start", 5) == 0) | |
5552 | addrp = &lm_addr; | |
5553 | else if (len == 4 && strncmp (annex, "prev", 4) == 0) | |
5554 | addrp = &lm_prev; | |
5555 | else | |
5556 | { | |
5557 | annex = strchr (sep, ';'); | |
5558 | if (annex == NULL) | |
5559 | break; | |
5560 | annex++; | |
5561 | continue; | |
5562 | } | |
5563 | ||
5564 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
2268b414 | 5565 | } |
b1fbec62 GB |
5566 | |
5567 | if (lm_addr == 0) | |
2268b414 | 5568 | { |
b1fbec62 GB |
5569 | int r_version = 0; |
5570 | ||
5571 | if (priv->r_debug == 0) | |
5572 | priv->r_debug = get_r_debug (pid, is_elf64); | |
5573 | ||
5574 | /* We failed to find DT_DEBUG. Such situation will not change | |
5575 | for this inferior - do not retry it. Report it to GDB as | |
5576 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
5577 | if (priv->r_debug == (CORE_ADDR) -1) | |
5578 | return -1; | |
5579 | ||
5580 | if (priv->r_debug != 0) | |
2268b414 | 5581 | { |
b1fbec62 GB |
5582 | if (linux_read_memory (priv->r_debug + lmo->r_version_offset, |
5583 | (unsigned char *) &r_version, | |
5584 | sizeof (r_version)) != 0 | |
5585 | || r_version != 1) | |
5586 | { | |
5587 | warning ("unexpected r_debug version %d", r_version); | |
5588 | } | |
5589 | else if (read_one_ptr (priv->r_debug + lmo->r_map_offset, | |
5590 | &lm_addr, ptr_size) != 0) | |
5591 | { | |
5592 | warning ("unable to read r_map from 0x%lx", | |
5593 | (long) priv->r_debug + lmo->r_map_offset); | |
5594 | } | |
2268b414 | 5595 | } |
b1fbec62 | 5596 | } |
2268b414 | 5597 | |
b1fbec62 GB |
5598 | document = xmalloc (allocated); |
5599 | strcpy (document, "<library-list-svr4 version=\"1.0\""); | |
5600 | p = document + strlen (document); | |
5601 | ||
5602 | while (lm_addr | |
5603 | && read_one_ptr (lm_addr + lmo->l_name_offset, | |
5604 | &l_name, ptr_size) == 0 | |
5605 | && read_one_ptr (lm_addr + lmo->l_addr_offset, | |
5606 | &l_addr, ptr_size) == 0 | |
5607 | && read_one_ptr (lm_addr + lmo->l_ld_offset, | |
5608 | &l_ld, ptr_size) == 0 | |
5609 | && read_one_ptr (lm_addr + lmo->l_prev_offset, | |
5610 | &l_prev, ptr_size) == 0 | |
5611 | && read_one_ptr (lm_addr + lmo->l_next_offset, | |
5612 | &l_next, ptr_size) == 0) | |
5613 | { | |
5614 | unsigned char libname[PATH_MAX]; | |
5615 | ||
5616 | if (lm_prev != l_prev) | |
2268b414 | 5617 | { |
b1fbec62 GB |
5618 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", |
5619 | (long) lm_prev, (long) l_prev); | |
5620 | break; | |
2268b414 JK |
5621 | } |
5622 | ||
d878444c JK |
5623 | /* Ignore the first entry even if it has valid name as the first entry |
5624 | corresponds to the main executable. The first entry should not be | |
5625 | skipped if the dynamic loader was loaded late by a static executable | |
5626 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
5627 | executable does not have PT_DYNAMIC present and this function already | |
5628 | exited above due to failed get_r_debug. */ | |
5629 | if (lm_prev == 0) | |
2268b414 | 5630 | { |
d878444c JK |
5631 | sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr); |
5632 | p = p + strlen (p); | |
5633 | } | |
5634 | else | |
5635 | { | |
5636 | /* Not checking for error because reading may stop before | |
5637 | we've got PATH_MAX worth of characters. */ | |
5638 | libname[0] = '\0'; | |
5639 | linux_read_memory (l_name, libname, sizeof (libname) - 1); | |
5640 | libname[sizeof (libname) - 1] = '\0'; | |
5641 | if (libname[0] != '\0') | |
2268b414 | 5642 | { |
d878444c JK |
5643 | /* 6x the size for xml_escape_text below. */ |
5644 | size_t len = 6 * strlen ((char *) libname); | |
5645 | char *name; | |
2268b414 | 5646 | |
d878444c JK |
5647 | if (!header_done) |
5648 | { | |
5649 | /* Terminate `<library-list-svr4'. */ | |
5650 | *p++ = '>'; | |
5651 | header_done = 1; | |
5652 | } | |
2268b414 | 5653 | |
d878444c JK |
5654 | while (allocated < p - document + len + 200) |
5655 | { | |
5656 | /* Expand to guarantee sufficient storage. */ | |
5657 | uintptr_t document_len = p - document; | |
2268b414 | 5658 | |
d878444c JK |
5659 | document = xrealloc (document, 2 * allocated); |
5660 | allocated *= 2; | |
5661 | p = document + document_len; | |
5662 | } | |
5663 | ||
5664 | name = xml_escape_text ((char *) libname); | |
5665 | p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" " | |
5666 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
5667 | name, (unsigned long) lm_addr, | |
5668 | (unsigned long) l_addr, (unsigned long) l_ld); | |
5669 | free (name); | |
5670 | } | |
0afae3cf | 5671 | } |
b1fbec62 GB |
5672 | |
5673 | lm_prev = lm_addr; | |
5674 | lm_addr = l_next; | |
2268b414 JK |
5675 | } |
5676 | ||
b1fbec62 GB |
5677 | if (!header_done) |
5678 | { | |
5679 | /* Empty list; terminate `<library-list-svr4'. */ | |
5680 | strcpy (p, "/>"); | |
5681 | } | |
5682 | else | |
5683 | strcpy (p, "</library-list-svr4>"); | |
5684 | ||
2268b414 JK |
5685 | document_len = strlen (document); |
5686 | if (offset < document_len) | |
5687 | document_len -= offset; | |
5688 | else | |
5689 | document_len = 0; | |
5690 | if (len > document_len) | |
5691 | len = document_len; | |
5692 | ||
5693 | memcpy (readbuf, document + offset, len); | |
5694 | xfree (document); | |
5695 | ||
5696 | return len; | |
5697 | } | |
5698 | ||
9accd112 MM |
5699 | #ifdef HAVE_LINUX_BTRACE |
5700 | ||
5701 | /* Enable branch tracing. */ | |
5702 | ||
5703 | static struct btrace_target_info * | |
5704 | linux_low_enable_btrace (ptid_t ptid) | |
5705 | { | |
5706 | struct btrace_target_info *tinfo; | |
5707 | ||
5708 | tinfo = linux_enable_btrace (ptid); | |
3aee8918 | 5709 | |
9accd112 | 5710 | if (tinfo != NULL) |
3aee8918 PA |
5711 | { |
5712 | struct thread_info *thread = find_thread_ptid (ptid); | |
5713 | struct regcache *regcache = get_thread_regcache (thread, 0); | |
5714 | ||
5715 | tinfo->ptr_bits = register_size (regcache->tdesc, 0) * 8; | |
5716 | } | |
9accd112 MM |
5717 | |
5718 | return tinfo; | |
5719 | } | |
5720 | ||
5721 | /* Read branch trace data as btrace xml document. */ | |
5722 | ||
5723 | static void | |
5724 | linux_low_read_btrace (struct btrace_target_info *tinfo, struct buffer *buffer, | |
5725 | int type) | |
5726 | { | |
5727 | VEC (btrace_block_s) *btrace; | |
5728 | struct btrace_block *block; | |
5729 | int i; | |
5730 | ||
5731 | btrace = linux_read_btrace (tinfo, type); | |
5732 | ||
5733 | buffer_grow_str (buffer, "<!DOCTYPE btrace SYSTEM \"btrace.dtd\">\n"); | |
5734 | buffer_grow_str (buffer, "<btrace version=\"1.0\">\n"); | |
5735 | ||
5736 | for (i = 0; VEC_iterate (btrace_block_s, btrace, i, block); i++) | |
5737 | buffer_xml_printf (buffer, "<block begin=\"0x%s\" end=\"0x%s\"/>\n", | |
5738 | paddress (block->begin), paddress (block->end)); | |
5739 | ||
5740 | buffer_grow_str (buffer, "</btrace>\n"); | |
5741 | ||
5742 | VEC_free (btrace_block_s, btrace); | |
5743 | } | |
5744 | #endif /* HAVE_LINUX_BTRACE */ | |
5745 | ||
ce3a066d DJ |
5746 | static struct target_ops linux_target_ops = { |
5747 | linux_create_inferior, | |
5748 | linux_attach, | |
5749 | linux_kill, | |
6ad8ae5c | 5750 | linux_detach, |
8336d594 | 5751 | linux_mourn, |
444d6139 | 5752 | linux_join, |
ce3a066d DJ |
5753 | linux_thread_alive, |
5754 | linux_resume, | |
5755 | linux_wait, | |
5756 | linux_fetch_registers, | |
5757 | linux_store_registers, | |
90d74c30 | 5758 | linux_prepare_to_access_memory, |
0146f85b | 5759 | linux_done_accessing_memory, |
ce3a066d DJ |
5760 | linux_read_memory, |
5761 | linux_write_memory, | |
2f2893d9 | 5762 | linux_look_up_symbols, |
ef57601b | 5763 | linux_request_interrupt, |
aa691b87 | 5764 | linux_read_auxv, |
d993e290 PA |
5765 | linux_insert_point, |
5766 | linux_remove_point, | |
e013ee27 OF |
5767 | linux_stopped_by_watchpoint, |
5768 | linux_stopped_data_address, | |
db0dfaa0 LM |
5769 | #if defined(__UCLIBC__) && defined(HAS_NOMMU) \ |
5770 | && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \ | |
5771 | && defined(PT_TEXT_END_ADDR) | |
52fb6437 | 5772 | linux_read_offsets, |
dae5f5cf DJ |
5773 | #else |
5774 | NULL, | |
5775 | #endif | |
5776 | #ifdef USE_THREAD_DB | |
5777 | thread_db_get_tls_address, | |
5778 | #else | |
5779 | NULL, | |
52fb6437 | 5780 | #endif |
efcbbd14 | 5781 | linux_qxfer_spu, |
59a016f0 | 5782 | hostio_last_error_from_errno, |
07e059b5 | 5783 | linux_qxfer_osdata, |
4aa995e1 | 5784 | linux_xfer_siginfo, |
bd99dc85 PA |
5785 | linux_supports_non_stop, |
5786 | linux_async, | |
5787 | linux_start_non_stop, | |
cdbfd419 PP |
5788 | linux_supports_multi_process, |
5789 | #ifdef USE_THREAD_DB | |
dc146f7c | 5790 | thread_db_handle_monitor_command, |
cdbfd419 | 5791 | #else |
dc146f7c | 5792 | NULL, |
cdbfd419 | 5793 | #endif |
d26e3629 | 5794 | linux_common_core_of_thread, |
78d85199 | 5795 | linux_read_loadmap, |
219f2f23 PA |
5796 | linux_process_qsupported, |
5797 | linux_supports_tracepoints, | |
5798 | linux_read_pc, | |
8336d594 PA |
5799 | linux_write_pc, |
5800 | linux_thread_stopped, | |
7984d532 | 5801 | NULL, |
711e434b | 5802 | linux_pause_all, |
7984d532 | 5803 | linux_unpause_all, |
fa593d66 PA |
5804 | linux_cancel_breakpoints, |
5805 | linux_stabilize_threads, | |
6a271cae | 5806 | linux_install_fast_tracepoint_jump_pad, |
03583c20 UW |
5807 | linux_emit_ops, |
5808 | linux_supports_disable_randomization, | |
405f8e94 | 5809 | linux_get_min_fast_tracepoint_insn_len, |
2268b414 | 5810 | linux_qxfer_libraries_svr4, |
d1feda86 | 5811 | linux_supports_agent, |
9accd112 MM |
5812 | #ifdef HAVE_LINUX_BTRACE |
5813 | linux_supports_btrace, | |
5814 | linux_low_enable_btrace, | |
5815 | linux_disable_btrace, | |
5816 | linux_low_read_btrace, | |
5817 | #else | |
5818 | NULL, | |
5819 | NULL, | |
5820 | NULL, | |
5821 | NULL, | |
9accd112 | 5822 | #endif |
c2d6af84 | 5823 | linux_supports_range_stepping, |
ce3a066d DJ |
5824 | }; |
5825 | ||
0d62e5e8 DJ |
5826 | static void |
5827 | linux_init_signals () | |
5828 | { | |
5829 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads | |
5830 | to find what the cancel signal actually is. */ | |
1a981360 | 5831 | #ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */ |
254787d4 | 5832 | signal (__SIGRTMIN+1, SIG_IGN); |
60c3d7b0 | 5833 | #endif |
0d62e5e8 DJ |
5834 | } |
5835 | ||
3aee8918 PA |
5836 | #ifdef HAVE_LINUX_REGSETS |
5837 | void | |
5838 | initialize_regsets_info (struct regsets_info *info) | |
5839 | { | |
5840 | for (info->num_regsets = 0; | |
5841 | info->regsets[info->num_regsets].size >= 0; | |
5842 | info->num_regsets++) | |
5843 | ; | |
3aee8918 PA |
5844 | } |
5845 | #endif | |
5846 | ||
da6d8c04 DJ |
5847 | void |
5848 | initialize_low (void) | |
5849 | { | |
bd99dc85 PA |
5850 | struct sigaction sigchld_action; |
5851 | memset (&sigchld_action, 0, sizeof (sigchld_action)); | |
ce3a066d | 5852 | set_target_ops (&linux_target_ops); |
611cb4a5 DJ |
5853 | set_breakpoint_data (the_low_target.breakpoint, |
5854 | the_low_target.breakpoint_len); | |
0d62e5e8 | 5855 | linux_init_signals (); |
aa7c7447 | 5856 | linux_ptrace_init_warnings (); |
bd99dc85 PA |
5857 | |
5858 | sigchld_action.sa_handler = sigchld_handler; | |
5859 | sigemptyset (&sigchld_action.sa_mask); | |
5860 | sigchld_action.sa_flags = SA_RESTART; | |
5861 | sigaction (SIGCHLD, &sigchld_action, NULL); | |
3aee8918 PA |
5862 | |
5863 | initialize_low_arch (); | |
da6d8c04 | 5864 | } |