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