Commit | Line | Data |
---|---|---|
62ba5048 KR |
1 | /* Copyright (C) 2020 Free Software Foundation, Inc. |
2 | ||
3 | This file is part of GDB. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include "server.h" | |
19 | #include "target.h" | |
20 | #include "netbsd-low.h" | |
21 | #include "nat/netbsd-nat.h" | |
22 | ||
23 | #include <sys/param.h> | |
24 | #include <sys/types.h> | |
25 | ||
26 | #include <sys/ptrace.h> | |
27 | #include <sys/sysctl.h> | |
28 | ||
29 | #include <limits.h> | |
30 | #include <unistd.h> | |
31 | #include <signal.h> | |
32 | ||
33 | #include <elf.h> | |
34 | ||
35 | #include <type_traits> | |
36 | ||
37 | #include "gdbsupport/eintr.h" | |
38 | #include "gdbsupport/gdb_wait.h" | |
39 | #include "gdbsupport/filestuff.h" | |
40 | #include "gdbsupport/common-inferior.h" | |
41 | #include "nat/fork-inferior.h" | |
42 | #include "hostio.h" | |
43 | ||
44 | int using_threads = 1; | |
45 | ||
46 | const struct target_desc *netbsd_tdesc; | |
47 | ||
48 | /* Call add_process with the given parameters, and initialize | |
49 | the process' private data. */ | |
50 | ||
51 | static void | |
52 | netbsd_add_process (int pid, int attached) | |
53 | { | |
54 | struct process_info *proc = add_process (pid, attached); | |
55 | proc->tdesc = netbsd_tdesc; | |
56 | proc->priv = nullptr; | |
57 | } | |
58 | ||
59 | /* Callback used by fork_inferior to start tracing the inferior. */ | |
60 | ||
61 | static void | |
62 | netbsd_ptrace_fun () | |
63 | { | |
64 | /* Switch child to its own process group so that signals won't | |
65 | directly affect GDBserver. */ | |
66 | if (setpgid (0, 0) < 0) | |
67 | trace_start_error_with_name (("setpgid")); | |
68 | ||
69 | if (ptrace (PT_TRACE_ME, 0, nullptr, 0) < 0) | |
70 | trace_start_error_with_name (("ptrace")); | |
71 | ||
72 | /* If GDBserver is connected to gdb via stdio, redirect the inferior's | |
73 | stdout to stderr so that inferior i/o doesn't corrupt the connection. | |
74 | Also, redirect stdin to /dev/null. */ | |
75 | if (remote_connection_is_stdio ()) | |
76 | { | |
77 | if (close (0) < 0) | |
78 | trace_start_error_with_name (("close")); | |
79 | if (open ("/dev/null", O_RDONLY) < 0) | |
80 | trace_start_error_with_name (("open")); | |
81 | if (dup2 (2, 1) < 0) | |
82 | trace_start_error_with_name (("dup2")); | |
83 | if (write (2, "stdin/stdout redirected\n", | |
84 | sizeof ("stdin/stdout redirected\n") - 1) < 0) | |
85 | { | |
86 | /* Errors ignored. */ | |
87 | } | |
88 | } | |
89 | } | |
90 | ||
91 | /* Implement the create_inferior method of the target_ops vector. */ | |
92 | ||
93 | int | |
94 | netbsd_process_target::create_inferior (const char *program, | |
95 | const std::vector<char *> &program_args) | |
96 | { | |
97 | std::string str_program_args = construct_inferior_arguments (program_args); | |
98 | ||
99 | pid_t pid = fork_inferior (program, str_program_args.c_str (), | |
100 | get_environ ()->envp (), netbsd_ptrace_fun, | |
101 | nullptr, nullptr, nullptr, nullptr); | |
102 | ||
103 | netbsd_add_process (pid, 0); | |
104 | ||
105 | post_fork_inferior (pid, program); | |
106 | ||
107 | return pid; | |
108 | } | |
109 | ||
110 | /* Implement the post_create_inferior target_ops method. */ | |
111 | ||
112 | void | |
113 | netbsd_process_target::post_create_inferior () | |
114 | { | |
115 | pid_t pid = current_process ()->pid; | |
116 | netbsd_nat::enable_proc_events (pid); | |
117 | } | |
118 | ||
119 | /* Implement the attach target_ops method. */ | |
120 | ||
121 | int | |
122 | netbsd_process_target::attach (unsigned long pid) | |
123 | { | |
124 | /* Unimplemented. */ | |
125 | return -1; | |
126 | } | |
127 | ||
128 | /* Returns true if GDB is interested in any child syscalls. */ | |
129 | ||
130 | static bool | |
131 | gdb_catching_syscalls_p (pid_t pid) | |
132 | { | |
133 | struct process_info *proc = find_process_pid (pid); | |
134 | return !proc->syscalls_to_catch.empty (); | |
135 | } | |
136 | ||
137 | /* Implement the resume target_ops method. */ | |
138 | ||
139 | void | |
140 | netbsd_process_target::resume (struct thread_resume *resume_info, size_t n) | |
141 | { | |
142 | ptid_t resume_ptid = resume_info[0].thread; | |
143 | const int signal = resume_info[0].sig; | |
144 | const bool step = resume_info[0].kind == resume_step; | |
145 | ||
146 | if (resume_ptid == minus_one_ptid) | |
147 | resume_ptid = ptid_of (current_thread); | |
148 | ||
149 | const pid_t pid = resume_ptid.pid (); | |
150 | const lwpid_t lwp = resume_ptid.lwp (); | |
151 | regcache_invalidate_pid (pid); | |
152 | ||
153 | auto fn | |
154 | = [&] (ptid_t ptid) | |
155 | { | |
156 | if (step) | |
157 | { | |
158 | if (ptid.lwp () == lwp || n != 1) | |
159 | { | |
160 | if (ptrace (PT_SETSTEP, pid, NULL, ptid.lwp ()) == -1) | |
161 | perror_with_name (("ptrace")); | |
162 | if (ptrace (PT_RESUME, pid, NULL, ptid.lwp ()) == -1) | |
163 | perror_with_name (("ptrace")); | |
164 | } | |
165 | else | |
166 | { | |
167 | if (ptrace (PT_CLEARSTEP, pid, NULL, ptid.lwp ()) == -1) | |
168 | perror_with_name (("ptrace")); | |
169 | if (ptrace (PT_SUSPEND, pid, NULL, ptid.lwp ()) == -1) | |
170 | perror_with_name (("ptrace")); | |
171 | } | |
172 | } | |
173 | else | |
174 | { | |
175 | if (ptrace (PT_CLEARSTEP, pid, NULL, ptid.lwp ()) == -1) | |
176 | perror_with_name (("ptrace")); | |
177 | if (ptrace (PT_RESUME, pid, NULL, ptid.lwp ()) == -1) | |
178 | perror_with_name (("ptrace")); | |
179 | } | |
180 | }; | |
181 | ||
182 | netbsd_nat::for_each_thread (pid, fn); | |
183 | ||
184 | int request = gdb_catching_syscalls_p (pid) ? PT_CONTINUE : PT_SYSCALL; | |
185 | ||
186 | errno = 0; | |
187 | ptrace (request, pid, (void *)1, signal); | |
188 | if (errno) | |
189 | perror_with_name (("ptrace")); | |
190 | } | |
191 | ||
192 | /* Returns true if GDB is interested in the reported SYSNO syscall. */ | |
193 | ||
194 | static bool | |
195 | netbsd_catch_this_syscall (int sysno) | |
196 | { | |
197 | struct process_info *proc = current_process (); | |
198 | ||
199 | if (proc->syscalls_to_catch.empty ()) | |
200 | return false; | |
201 | ||
202 | if (proc->syscalls_to_catch[0] == ANY_SYSCALL) | |
203 | return true; | |
204 | ||
205 | for (int iter : proc->syscalls_to_catch) | |
206 | if (iter == sysno) | |
207 | return true; | |
208 | ||
209 | return false; | |
210 | } | |
211 | ||
212 | /* Helper function for child_wait and the derivatives of child_wait. | |
213 | HOSTSTATUS is the waitstatus from wait() or the equivalent; store our | |
214 | translation of that in OURSTATUS. */ | |
215 | ||
216 | static void | |
217 | netbsd_store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus) | |
218 | { | |
219 | if (WIFEXITED (hoststatus)) | |
220 | { | |
221 | ourstatus->kind = TARGET_WAITKIND_EXITED; | |
222 | ourstatus->value.integer = WEXITSTATUS (hoststatus); | |
223 | } | |
224 | else if (!WIFSTOPPED (hoststatus)) | |
225 | { | |
226 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
227 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus)); | |
228 | } | |
229 | else | |
230 | { | |
231 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
232 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus)); | |
233 | } | |
234 | } | |
235 | ||
236 | /* Implement a safe wrapper around waitpid(). */ | |
237 | ||
238 | static pid_t | |
239 | netbsd_waitpid (ptid_t ptid, struct target_waitstatus *ourstatus, int options) | |
240 | { | |
241 | int status; | |
242 | ||
243 | pid_t pid | |
244 | = gdb::handle_eintr<int> (-1, ::waitpid, ptid.pid (), &status, options); | |
245 | ||
246 | if (pid == -1) | |
247 | perror_with_name (_("Child process unexpectedly missing")); | |
248 | ||
249 | netbsd_store_waitstatus (ourstatus, status); | |
250 | return pid; | |
251 | } | |
252 | ||
253 | ||
254 | /* Implement the wait target_ops method. | |
255 | ||
256 | Wait for the child specified by PTID to do something. Return the | |
257 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
258 | the status in *OURSTATUS. */ | |
259 | ||
260 | static ptid_t | |
261 | netbsd_wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
262 | int target_options) | |
263 | { | |
264 | pid_t pid = netbsd_waitpid (ptid, ourstatus, target_options); | |
265 | ptid_t wptid = ptid_t (pid); | |
266 | ||
267 | if (pid == 0) | |
268 | { | |
269 | gdb_assert (target_options & TARGET_WNOHANG); | |
270 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
271 | return null_ptid; | |
272 | } | |
273 | ||
274 | gdb_assert (pid != -1); | |
275 | ||
276 | /* If the child stopped, keep investigating its status. */ | |
277 | if (ourstatus->kind != TARGET_WAITKIND_STOPPED) | |
278 | return wptid; | |
279 | ||
280 | /* Extract the event and thread that received a signal. */ | |
281 | ptrace_siginfo_t psi; | |
282 | if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1) | |
283 | perror_with_name (("ptrace")); | |
284 | ||
285 | /* Pick child's siginfo_t. */ | |
286 | siginfo_t *si = &psi.psi_siginfo; | |
287 | ||
288 | lwpid_t lwp = psi.psi_lwpid; | |
289 | ||
290 | int signo = si->si_signo; | |
291 | const int code = si->si_code; | |
292 | ||
293 | /* Construct PTID with a specified thread that received the event. | |
294 | If a signal was targeted to the whole process, lwp is 0. */ | |
295 | wptid = ptid_t (pid, lwp, 0); | |
296 | ||
297 | /* Bail out on non-debugger oriented signals. */ | |
298 | if (signo != SIGTRAP) | |
299 | return wptid; | |
300 | ||
301 | /* Stop examining non-debugger oriented SIGTRAP codes. */ | |
302 | if (code <= SI_USER || code == SI_NOINFO) | |
303 | return wptid; | |
304 | ||
305 | /* Process state for threading events. */ | |
306 | ptrace_state_t pst = {}; | |
307 | if (code == TRAP_LWP) | |
308 | if (ptrace (PT_GET_PROCESS_STATE, pid, &pst, sizeof (pst)) == -1) | |
309 | perror_with_name (("ptrace")); | |
310 | ||
311 | if (code == TRAP_LWP && pst.pe_report_event == PTRACE_LWP_EXIT) | |
312 | { | |
313 | /* If GDB attaches to a multi-threaded process, exiting | |
314 | threads might be skipped during post_attach that | |
315 | have not yet reported their PTRACE_LWP_EXIT event. | |
316 | Ignore exited events for an unknown LWP. */ | |
317 | thread_info *thr = find_thread_ptid (wptid); | |
318 | if (thr == nullptr) | |
319 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
320 | else | |
321 | { | |
322 | ourstatus->kind = TARGET_WAITKIND_THREAD_EXITED; | |
323 | /* NetBSD does not store an LWP exit status. */ | |
324 | ourstatus->value.integer = 0; | |
325 | ||
326 | remove_thread (thr); | |
327 | } | |
328 | return wptid; | |
329 | } | |
330 | ||
331 | if (find_thread_ptid (ptid_t (pid))) | |
332 | current_thread = find_thread_ptid (wptid); | |
333 | ||
334 | if (code == TRAP_LWP && pst.pe_report_event == PTRACE_LWP_CREATE) | |
335 | { | |
336 | /* If GDB attaches to a multi-threaded process, newborn | |
337 | threads might be added by nbsd_add_threads that have | |
338 | not yet reported their PTRACE_LWP_CREATE event. Ignore | |
339 | born events for an already-known LWP. */ | |
340 | if (find_thread_ptid (wptid)) | |
341 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
342 | else | |
343 | { | |
344 | add_thread (wptid, NULL); | |
345 | ourstatus->kind = TARGET_WAITKIND_THREAD_CREATED; | |
346 | } | |
347 | return wptid; | |
348 | } | |
349 | ||
350 | if (code == TRAP_EXEC) | |
351 | { | |
352 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
353 | ourstatus->value.execd_pathname | |
354 | = xstrdup (netbsd_nat::pid_to_exec_file (pid)); | |
355 | return wptid; | |
356 | } | |
357 | ||
358 | if (code == TRAP_TRACE) | |
359 | return wptid; | |
360 | ||
361 | if (code == TRAP_SCE || code == TRAP_SCX) | |
362 | { | |
363 | int sysnum = si->si_sysnum; | |
364 | ||
365 | if (!netbsd_catch_this_syscall(sysnum)) | |
366 | { | |
367 | /* If the core isn't interested in this event, ignore it. */ | |
368 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
369 | return wptid; | |
370 | } | |
371 | ||
372 | ourstatus->kind | |
373 | = ((code == TRAP_SCE) ? TARGET_WAITKIND_SYSCALL_ENTRY : | |
374 | TARGET_WAITKIND_SYSCALL_RETURN); | |
375 | ourstatus->value.syscall_number = sysnum; | |
376 | return wptid; | |
377 | } | |
378 | ||
379 | if (code == TRAP_BRKPT) | |
380 | { | |
381 | #ifdef PTRACE_BREAKPOINT_ADJ | |
382 | CORE_ADDR pc; | |
383 | struct reg r; | |
384 | ptrace (PT_GETREGS, pid, &r, psi.psi_lwpid); | |
385 | pc = PTRACE_REG_PC (&r); | |
386 | PTRACE_REG_SET_PC (&r, pc - PTRACE_BREAKPOINT_ADJ); | |
387 | ptrace (PT_SETREGS, pid, &r, psi.psi_lwpid); | |
388 | #endif | |
389 | return wptid; | |
390 | } | |
391 | ||
392 | /* Unclassified SIGTRAP event. */ | |
393 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
394 | return wptid; | |
395 | } | |
396 | ||
397 | /* Implement the wait target_ops method. */ | |
398 | ||
399 | ptid_t | |
400 | netbsd_process_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
401 | int target_options) | |
402 | { | |
403 | while (true) | |
404 | { | |
405 | ptid_t wptid = netbsd_wait (ptid, ourstatus, target_options); | |
406 | ||
407 | /* Register thread in the gdbcore if a thread was not reported earlier. | |
408 | This is required after ::create_inferior, when the gdbcore does not | |
409 | know about the first internal thread. | |
410 | This may also happen on attach, when an event is registered on a thread | |
411 | that was not fully initialized during the attach stage. */ | |
412 | if (wptid.lwp () != 0 && !find_thread_ptid (wptid) | |
413 | && ourstatus->kind != TARGET_WAITKIND_THREAD_EXITED) | |
414 | add_thread (wptid, nullptr); | |
415 | ||
416 | switch (ourstatus->kind) | |
417 | { | |
418 | case TARGET_WAITKIND_EXITED: | |
419 | case TARGET_WAITKIND_STOPPED: | |
420 | case TARGET_WAITKIND_SIGNALLED: | |
421 | case TARGET_WAITKIND_FORKED: | |
422 | case TARGET_WAITKIND_VFORKED: | |
423 | case TARGET_WAITKIND_EXECD: | |
424 | case TARGET_WAITKIND_VFORK_DONE: | |
425 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
426 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
427 | /* Pass the result to the generic code. */ | |
428 | return wptid; | |
429 | case TARGET_WAITKIND_THREAD_CREATED: | |
430 | case TARGET_WAITKIND_THREAD_EXITED: | |
431 | /* The core needlessly stops on these events. */ | |
432 | /* FALLTHROUGH */ | |
433 | case TARGET_WAITKIND_SPURIOUS: | |
434 | /* Spurious events are unhandled by the gdbserver core. */ | |
435 | if (ptrace (PT_CONTINUE, current_process ()->pid, (void *) 1, 0) | |
436 | == -1) | |
437 | perror_with_name (("ptrace")); | |
438 | break; | |
439 | default: | |
440 | error (("Unknown stopped status")); | |
441 | } | |
442 | } | |
443 | } | |
444 | ||
445 | /* Implement the kill target_ops method. */ | |
446 | ||
447 | int | |
448 | netbsd_process_target::kill (process_info *process) | |
449 | { | |
450 | pid_t pid = process->pid; | |
451 | if (ptrace (PT_KILL, pid, nullptr, 0) == -1) | |
452 | return -1; | |
453 | ||
454 | int status; | |
455 | if (gdb::handle_eintr<int> (-1, ::waitpid, pid, &status, 0) == -1) | |
456 | return -1; | |
457 | mourn (process); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | /* Implement the detach target_ops method. */ | |
462 | ||
463 | int | |
464 | netbsd_process_target::detach (process_info *process) | |
465 | { | |
466 | pid_t pid = process->pid; | |
467 | ||
468 | ptrace (PT_DETACH, pid, (void *) 1, 0); | |
469 | mourn (process); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | /* Implement the mourn target_ops method. */ | |
474 | ||
475 | void | |
476 | netbsd_process_target::mourn (struct process_info *proc) | |
477 | { | |
478 | for_each_thread (proc->pid, remove_thread); | |
479 | ||
480 | remove_process (proc); | |
481 | } | |
482 | ||
483 | /* Implement the join target_ops method. */ | |
484 | ||
485 | void | |
486 | netbsd_process_target::join (int pid) | |
487 | { | |
488 | /* The PT_DETACH is sufficient to detach from the process. | |
489 | So no need to do anything extra. */ | |
490 | } | |
491 | ||
492 | /* Implement the thread_alive target_ops method. */ | |
493 | ||
494 | bool | |
495 | netbsd_process_target::thread_alive (ptid_t ptid) | |
496 | { | |
497 | return netbsd_nat::thread_alive (ptid); | |
498 | } | |
499 | ||
500 | /* Implement the fetch_registers target_ops method. */ | |
501 | ||
502 | void | |
503 | netbsd_process_target::fetch_registers (struct regcache *regcache, int regno) | |
504 | { | |
505 | struct netbsd_regset_info *regset = netbsd_target_regsets; | |
506 | ptid_t inferior_ptid = ptid_of (current_thread); | |
507 | ||
508 | while (regset->size >= 0) | |
509 | { | |
510 | std::vector<char> buf; | |
511 | buf.resize (regset->size); | |
512 | int res = ptrace (regset->get_request, inferior_ptid.pid (), buf.data (), | |
513 | inferior_ptid.lwp ()); | |
514 | if (res == -1) | |
515 | perror_with_name (("ptrace")); | |
516 | regset->store_function (regcache, buf.data ()); | |
517 | regset++; | |
518 | } | |
519 | } | |
520 | ||
521 | /* Implement the store_registers target_ops method. */ | |
522 | ||
523 | void | |
524 | netbsd_process_target::store_registers (struct regcache *regcache, int regno) | |
525 | { | |
526 | struct netbsd_regset_info *regset = netbsd_target_regsets; | |
527 | ptid_t inferior_ptid = ptid_of (current_thread); | |
528 | ||
529 | while (regset->size >= 0) | |
530 | { | |
531 | std::vector<char> buf; | |
532 | buf.resize (regset->size); | |
533 | int res = ptrace (regset->get_request, inferior_ptid.pid (), buf.data (), | |
534 | inferior_ptid.lwp ()); | |
535 | if (res == -1) | |
536 | perror_with_name (("ptrace")); | |
537 | ||
538 | /* Then overlay our cached registers on that. */ | |
539 | regset->fill_function (regcache, buf.data ()); | |
540 | /* Only now do we write the register set. */ | |
541 | res = ptrace (regset->set_request, inferior_ptid.pid (), buf. data (), | |
542 | inferior_ptid.lwp ()); | |
543 | if (res == -1) | |
544 | perror_with_name (("ptrace")); | |
545 | regset++; | |
546 | } | |
547 | } | |
548 | ||
549 | /* Implement the read_memory target_ops method. */ | |
550 | ||
551 | int | |
552 | netbsd_process_target::read_memory (CORE_ADDR memaddr, unsigned char *myaddr, | |
553 | int size) | |
554 | { | |
555 | struct ptrace_io_desc io; | |
556 | io.piod_op = PIOD_READ_D; | |
557 | io.piod_len = size; | |
558 | ||
559 | pid_t pid = current_process ()->pid; | |
560 | ||
561 | int bytes_read = 0; | |
562 | ||
563 | if (size == 0) | |
564 | { | |
565 | /* Zero length write always succeeds. */ | |
566 | return 0; | |
567 | } | |
568 | do | |
569 | { | |
570 | io.piod_offs = (void *)(memaddr + bytes_read); | |
571 | io.piod_addr = myaddr + bytes_read; | |
572 | ||
573 | int rv = ptrace (PT_IO, pid, &io, 0); | |
574 | if (rv == -1) | |
575 | return errno; | |
576 | if (io.piod_len == 0) | |
577 | return 0; | |
578 | ||
579 | bytes_read += io.piod_len; | |
580 | io.piod_len = size - bytes_read; | |
581 | } | |
582 | while (bytes_read < size); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | /* Implement the write_memory target_ops method. */ | |
588 | ||
589 | int | |
590 | netbsd_process_target::write_memory (CORE_ADDR memaddr, | |
591 | const unsigned char *myaddr, int size) | |
592 | { | |
593 | struct ptrace_io_desc io; | |
594 | io.piod_op = PIOD_WRITE_D; | |
595 | io.piod_len = size; | |
596 | ||
597 | pid_t pid = current_process ()->pid; | |
598 | ||
599 | int bytes_written = 0; | |
600 | ||
601 | if (size == 0) | |
602 | { | |
603 | /* Zero length write always succeeds. */ | |
604 | return 0; | |
605 | } | |
606 | ||
607 | do | |
608 | { | |
609 | io.piod_addr = (void *)(myaddr + bytes_written); | |
610 | io.piod_offs = (void *)(memaddr + bytes_written); | |
611 | ||
612 | int rv = ptrace (PT_IO, pid, &io, 0); | |
613 | if (rv == -1) | |
614 | return errno; | |
615 | if (io.piod_len == 0) | |
616 | return 0; | |
617 | ||
618 | bytes_written += io.piod_len; | |
619 | io.piod_len = size - bytes_written; | |
620 | } | |
621 | while (bytes_written < size); | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | /* Implement the request_interrupt target_ops method. */ | |
627 | ||
628 | void | |
629 | netbsd_process_target::request_interrupt () | |
630 | { | |
631 | ptid_t inferior_ptid = ptid_of (get_first_thread ()); | |
632 | ||
633 | ::kill (inferior_ptid.pid(), SIGINT); | |
634 | } | |
635 | ||
636 | /* Read the AUX Vector for the specified PID, wrapping the ptrace(2) call | |
637 | with the PIOD_READ_AUXV operation and using the PT_IO standard input | |
638 | and output arguments. */ | |
639 | ||
640 | static size_t | |
641 | netbsd_read_auxv(pid_t pid, void *offs, void *addr, size_t len) | |
642 | { | |
643 | struct ptrace_io_desc pio; | |
644 | ||
645 | pio.piod_op = PIOD_READ_AUXV; | |
646 | pio.piod_offs = offs; | |
647 | pio.piod_addr = addr; | |
648 | pio.piod_len = len; | |
649 | ||
650 | if (ptrace (PT_IO, pid, &pio, 0) == -1) | |
651 | perror_with_name (("ptrace")); | |
652 | ||
653 | return pio.piod_len; | |
654 | } | |
655 | ||
656 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET | |
657 | to debugger memory starting at MYADDR. */ | |
658 | ||
659 | int | |
660 | netbsd_process_target::read_auxv (CORE_ADDR offset, | |
661 | unsigned char *myaddr, unsigned int len) | |
662 | { | |
663 | pid_t pid = pid_of (current_thread); | |
664 | ||
665 | return netbsd_read_auxv (pid, (void *) (intptr_t) offset, myaddr, len); | |
666 | } | |
667 | ||
668 | bool | |
669 | netbsd_process_target::supports_z_point_type (char z_type) | |
670 | { | |
671 | switch (z_type) | |
672 | { | |
673 | case Z_PACKET_SW_BP: | |
674 | return true; | |
675 | case Z_PACKET_HW_BP: | |
676 | case Z_PACKET_WRITE_WP: | |
677 | case Z_PACKET_READ_WP: | |
678 | case Z_PACKET_ACCESS_WP: | |
679 | default: | |
680 | return false; /* Not supported. */ | |
681 | } | |
682 | } | |
683 | ||
684 | /* Insert {break/watch}point at address ADDR. SIZE is not used. */ | |
685 | ||
686 | int | |
687 | netbsd_process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
688 | int size, struct raw_breakpoint *bp) | |
689 | { | |
690 | switch (type) | |
691 | { | |
692 | case raw_bkpt_type_sw: | |
693 | return insert_memory_breakpoint (bp); | |
694 | case raw_bkpt_type_hw: | |
695 | case raw_bkpt_type_write_wp: | |
696 | case raw_bkpt_type_read_wp: | |
697 | case raw_bkpt_type_access_wp: | |
698 | default: | |
699 | return 1; /* Not supported. */ | |
700 | } | |
701 | } | |
702 | ||
703 | /* Remove {break/watch}point at address ADDR. SIZE is not used. */ | |
704 | ||
705 | int | |
706 | netbsd_process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, | |
707 | int size, struct raw_breakpoint *bp) | |
708 | { | |
709 | switch (type) | |
710 | { | |
711 | case raw_bkpt_type_sw: | |
712 | return remove_memory_breakpoint (bp); | |
713 | case raw_bkpt_type_hw: | |
714 | case raw_bkpt_type_write_wp: | |
715 | case raw_bkpt_type_read_wp: | |
716 | case raw_bkpt_type_access_wp: | |
717 | default: | |
718 | return 1; /* Not supported. */ | |
719 | } | |
720 | } | |
721 | ||
722 | /* Implement the stopped_by_sw_breakpoint target_ops method. */ | |
723 | ||
724 | bool | |
725 | netbsd_process_target::stopped_by_sw_breakpoint () | |
726 | { | |
727 | ptrace_siginfo_t psi; | |
728 | pid_t pid = current_process ()->pid; | |
729 | ||
730 | if (ptrace (PT_GET_SIGINFO, pid, &psi, sizeof (psi)) == -1) | |
731 | perror_with_name (("ptrace")); | |
732 | ||
733 | return psi.psi_siginfo.si_signo == SIGTRAP && | |
734 | psi.psi_siginfo.si_code == TRAP_BRKPT; | |
735 | } | |
736 | ||
737 | /* Implement the supports_stopped_by_sw_breakpoint target_ops method. */ | |
738 | ||
739 | bool | |
740 | netbsd_process_target::supports_stopped_by_sw_breakpoint () | |
741 | { | |
742 | return true; | |
743 | } | |
744 | ||
745 | /* Implement the supports_qxfer_siginfo target_ops method. */ | |
746 | ||
747 | bool | |
748 | netbsd_process_target::supports_qxfer_siginfo () | |
749 | { | |
750 | return true; | |
751 | } | |
752 | ||
753 | /* Implement the qxfer_siginfo target_ops method. */ | |
754 | ||
755 | int | |
756 | netbsd_process_target::qxfer_siginfo (const char *annex, unsigned char *readbuf, | |
757 | unsigned const char *writebuf, | |
758 | CORE_ADDR offset, int len) | |
759 | { | |
760 | if (current_thread == nullptr) | |
761 | return -1; | |
762 | ||
763 | pid_t pid = current_process ()->pid; | |
764 | ||
765 | return netbsd_nat::qxfer_siginfo(pid, annex, readbuf, writebuf, offset, len); | |
766 | } | |
767 | ||
768 | /* Implement the supports_non_stop target_ops method. */ | |
769 | ||
770 | bool | |
771 | netbsd_process_target::supports_non_stop () | |
772 | { | |
773 | return false; | |
774 | } | |
775 | ||
776 | /* Implement the supports_multi_process target_ops method. */ | |
777 | ||
778 | bool | |
779 | netbsd_process_target::supports_multi_process () | |
780 | { | |
781 | return true; | |
782 | } | |
783 | ||
784 | /* Check if fork events are supported. */ | |
785 | ||
786 | bool | |
787 | netbsd_process_target::supports_fork_events () | |
788 | { | |
789 | return false; | |
790 | } | |
791 | ||
792 | /* Check if vfork events are supported. */ | |
793 | ||
794 | bool | |
795 | netbsd_process_target::supports_vfork_events () | |
796 | { | |
797 | return false; | |
798 | } | |
799 | ||
800 | /* Check if exec events are supported. */ | |
801 | ||
802 | bool | |
803 | netbsd_process_target::supports_exec_events () | |
804 | { | |
805 | return true; | |
806 | } | |
807 | ||
808 | /* Implement the supports_disable_randomization target_ops method. */ | |
809 | ||
810 | bool | |
811 | netbsd_process_target::supports_disable_randomization () | |
812 | { | |
813 | return false; | |
814 | } | |
815 | ||
816 | /* Extract &phdr and num_phdr in the inferior. Return 0 on success. */ | |
817 | ||
818 | template <typename T> | |
819 | int get_phdr_phnum_from_proc_auxv (const pid_t pid, | |
820 | CORE_ADDR *phdr_memaddr, int *num_phdr) | |
821 | { | |
822 | typedef typename std::conditional<sizeof(T) == sizeof(int64_t), | |
823 | Aux64Info, Aux32Info>::type auxv_type; | |
824 | const size_t auxv_size = sizeof (auxv_type); | |
825 | const size_t auxv_buf_size = 128 * sizeof (auxv_type); | |
826 | ||
827 | std::vector<char> auxv_buf; | |
828 | auxv_buf.resize (auxv_buf_size); | |
829 | ||
830 | netbsd_read_auxv (pid, nullptr, auxv_buf.data (), auxv_buf_size); | |
831 | ||
832 | *phdr_memaddr = 0; | |
833 | *num_phdr = 0; | |
834 | ||
835 | for (char *buf = auxv_buf.data (); | |
836 | buf < (auxv_buf.data () + auxv_buf_size); | |
837 | buf += auxv_size) | |
838 | { | |
839 | auxv_type *const aux = (auxv_type *) buf; | |
840 | ||
841 | switch (aux->a_type) | |
842 | { | |
843 | case AT_PHDR: | |
844 | *phdr_memaddr = aux->a_v; | |
845 | break; | |
846 | case AT_PHNUM: | |
847 | *num_phdr = aux->a_v; | |
848 | break; | |
849 | } | |
850 | ||
851 | if (*phdr_memaddr != 0 && *num_phdr != 0) | |
852 | break; | |
853 | } | |
854 | ||
855 | if (*phdr_memaddr == 0 || *num_phdr == 0) | |
856 | { | |
857 | warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: " | |
858 | "phdr_memaddr = %s, phdr_num = %d", | |
859 | core_addr_to_string (*phdr_memaddr), *num_phdr); | |
860 | return 2; | |
861 | } | |
862 | ||
863 | return 0; | |
864 | } | |
865 | ||
866 | /* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */ | |
867 | ||
868 | template <typename T> | |
869 | static CORE_ADDR | |
870 | get_dynamic (netbsd_process_target *target, const pid_t pid) | |
871 | { | |
872 | typedef typename std::conditional<sizeof(T) == sizeof(int64_t), | |
873 | Elf64_Phdr, Elf32_Phdr>::type phdr_type; | |
874 | const int phdr_size = sizeof (phdr_type); | |
875 | ||
876 | CORE_ADDR phdr_memaddr; | |
877 | int num_phdr; | |
878 | if (get_phdr_phnum_from_proc_auxv<T> (pid, &phdr_memaddr, &num_phdr)) | |
879 | return 0; | |
880 | ||
881 | std::vector<unsigned char> phdr_buf; | |
882 | phdr_buf.resize (num_phdr * phdr_size); | |
883 | ||
884 | if (target->read_memory (phdr_memaddr, phdr_buf.data (), phdr_buf.size ())) | |
885 | return 0; | |
886 | ||
887 | /* Compute relocation: it is expected to be 0 for "regular" executables, | |
888 | non-zero for PIE ones. */ | |
889 | CORE_ADDR relocation = -1; | |
890 | for (int i = 0; relocation == -1 && i < num_phdr; i++) | |
891 | { | |
892 | phdr_type *const p = (phdr_type *) (phdr_buf.data() + i * phdr_size); | |
893 | ||
894 | if (p->p_type == PT_PHDR) | |
895 | relocation = phdr_memaddr - p->p_vaddr; | |
896 | } | |
897 | ||
898 | if (relocation == -1) | |
899 | { | |
900 | /* PT_PHDR is optional, but necessary for PIE in general. Fortunately | |
901 | any real world executables, including PIE executables, have always | |
902 | PT_PHDR present. PT_PHDR is not present in some shared libraries or | |
903 | in fpc (Free Pascal 2.4) binaries but neither of those have a need for | |
904 | or present DT_DEBUG anyway (fpc binaries are statically linked). | |
905 | ||
906 | Therefore if there exists DT_DEBUG there is always also PT_PHDR. | |
907 | ||
908 | GDB could find RELOCATION also from AT_ENTRY - e_entry. */ | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | for (int i = 0; i < num_phdr; i++) | |
914 | { | |
915 | phdr_type *const p = (phdr_type *) (phdr_buf.data () + i * phdr_size); | |
916 | ||
917 | if (p->p_type == PT_DYNAMIC) | |
918 | return p->p_vaddr + relocation; | |
919 | } | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | /* Return &_r_debug in the inferior, or -1 if not present. Return value | |
925 | can be 0 if the inferior does not yet have the library list initialized. | |
926 | We look for DT_MIPS_RLD_MAP first. MIPS executables use this instead of | |
927 | DT_DEBUG, although they sometimes contain an unused DT_DEBUG entry too. */ | |
928 | ||
929 | template <typename T> | |
930 | static CORE_ADDR | |
931 | get_r_debug (netbsd_process_target *target, const int pid) | |
932 | { | |
933 | typedef typename std::conditional<sizeof(T) == sizeof(int64_t), | |
934 | Elf64_Dyn, Elf32_Dyn>::type dyn_type; | |
935 | const int dyn_size = sizeof (dyn_type); | |
936 | unsigned char buf[sizeof (dyn_type)]; /* The larger of the two. */ | |
937 | CORE_ADDR map = -1; | |
938 | ||
939 | CORE_ADDR dynamic_memaddr = get_dynamic<T> (target, pid); | |
940 | if (dynamic_memaddr == 0) | |
941 | return map; | |
942 | ||
943 | while (target->read_memory (dynamic_memaddr, buf, dyn_size) == 0) | |
944 | { | |
945 | dyn_type *const dyn = (dyn_type *) buf; | |
946 | #if defined DT_MIPS_RLD_MAP | |
947 | union | |
948 | { | |
949 | T map; | |
950 | unsigned char buf[sizeof (T)]; | |
951 | } | |
952 | rld_map; | |
953 | ||
954 | if (dyn->d_tag == DT_MIPS_RLD_MAP) | |
955 | { | |
956 | if (read_memory (dyn->d_un.d_val, | |
957 | rld_map.buf, sizeof (rld_map.buf)) == 0) | |
958 | return rld_map.map; | |
959 | else | |
960 | break; | |
961 | } | |
962 | #endif /* DT_MIPS_RLD_MAP */ | |
963 | ||
964 | if (dyn->d_tag == DT_DEBUG && map == -1) | |
965 | map = dyn->d_un.d_val; | |
966 | ||
967 | if (dyn->d_tag == DT_NULL) | |
968 | break; | |
969 | ||
970 | dynamic_memaddr += dyn_size; | |
971 | } | |
972 | ||
973 | return map; | |
974 | } | |
975 | ||
976 | /* Read one pointer from MEMADDR in the inferior. */ | |
977 | ||
978 | static int | |
979 | read_one_ptr (netbsd_process_target *target, CORE_ADDR memaddr, CORE_ADDR *ptr, | |
980 | int ptr_size) | |
981 | { | |
982 | /* Go through a union so this works on either big or little endian | |
983 | hosts, when the inferior's pointer size is smaller than the size | |
984 | of CORE_ADDR. It is assumed the inferior's endianness is the | |
985 | same of the superior's. */ | |
986 | ||
987 | union | |
988 | { | |
989 | CORE_ADDR core_addr; | |
990 | unsigned int ui; | |
991 | unsigned char uc; | |
992 | } addr; | |
993 | ||
994 | int ret = target->read_memory (memaddr, &addr.uc, ptr_size); | |
995 | if (ret == 0) | |
996 | { | |
997 | if (ptr_size == sizeof (CORE_ADDR)) | |
998 | *ptr = addr.core_addr; | |
999 | else if (ptr_size == sizeof (unsigned int)) | |
1000 | *ptr = addr.ui; | |
1001 | else | |
1002 | gdb_assert_not_reached ("unhandled pointer size"); | |
1003 | } | |
1004 | return ret; | |
1005 | } | |
1006 | ||
1007 | /* Construct qXfer:libraries-svr4:read reply. */ | |
1008 | ||
1009 | template <typename T> | |
1010 | int | |
1011 | netbsd_qxfer_libraries_svr4 (netbsd_process_target *target, | |
1012 | const pid_t pid, const char *annex, | |
1013 | unsigned char *readbuf, | |
1014 | unsigned const char *writebuf, | |
1015 | CORE_ADDR offset, int len) | |
1016 | { | |
1017 | struct link_map_offsets | |
1018 | { | |
1019 | /* Offset and size of r_debug.r_version. */ | |
1020 | int r_version_offset; | |
1021 | ||
1022 | /* Offset and size of r_debug.r_map. */ | |
1023 | int r_map_offset; | |
1024 | ||
1025 | /* Offset to l_addr field in struct link_map. */ | |
1026 | int l_addr_offset; | |
1027 | ||
1028 | /* Offset to l_name field in struct link_map. */ | |
1029 | int l_name_offset; | |
1030 | ||
1031 | /* Offset to l_ld field in struct link_map. */ | |
1032 | int l_ld_offset; | |
1033 | ||
1034 | /* Offset to l_next field in struct link_map. */ | |
1035 | int l_next_offset; | |
1036 | ||
1037 | /* Offset to l_prev field in struct link_map. */ | |
1038 | int l_prev_offset; | |
1039 | }; | |
1040 | ||
1041 | static const struct link_map_offsets lmo_32bit_offsets = | |
1042 | { | |
1043 | 0, /* r_version offset. */ | |
1044 | 4, /* r_debug.r_map offset. */ | |
1045 | 0, /* l_addr offset in link_map. */ | |
1046 | 4, /* l_name offset in link_map. */ | |
1047 | 8, /* l_ld offset in link_map. */ | |
1048 | 12, /* l_next offset in link_map. */ | |
1049 | 16 /* l_prev offset in link_map. */ | |
1050 | }; | |
1051 | ||
1052 | static const struct link_map_offsets lmo_64bit_offsets = | |
1053 | { | |
1054 | 0, /* r_version offset. */ | |
1055 | 8, /* r_debug.r_map offset. */ | |
1056 | 0, /* l_addr offset in link_map. */ | |
1057 | 8, /* l_name offset in link_map. */ | |
1058 | 16, /* l_ld offset in link_map. */ | |
1059 | 24, /* l_next offset in link_map. */ | |
1060 | 32 /* l_prev offset in link_map. */ | |
1061 | }; | |
1062 | ||
1063 | CORE_ADDR lm_addr = 0, lm_prev = 0; | |
1064 | CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev; | |
1065 | int header_done = 0; | |
1066 | ||
1067 | const struct link_map_offsets *lmo | |
1068 | = ((sizeof (T) == sizeof (int64_t)) | |
1069 | ? &lmo_64bit_offsets : &lmo_32bit_offsets); | |
1070 | int ptr_size = sizeof (T); | |
1071 | ||
1072 | while (annex[0] != '\0') | |
1073 | { | |
1074 | const char *sep = strchr (annex, '='); | |
1075 | if (sep == nullptr) | |
1076 | break; | |
1077 | ||
1078 | int name_len = sep - annex; | |
1079 | CORE_ADDR *addrp; | |
1080 | if (name_len == 5 && startswith (annex, "start")) | |
1081 | addrp = &lm_addr; | |
1082 | else if (name_len == 4 && startswith (annex, "prev")) | |
1083 | addrp = &lm_prev; | |
1084 | else | |
1085 | { | |
1086 | annex = strchr (sep, ';'); | |
1087 | if (annex == nullptr) | |
1088 | break; | |
1089 | annex++; | |
1090 | continue; | |
1091 | } | |
1092 | ||
1093 | annex = decode_address_to_semicolon (addrp, sep + 1); | |
1094 | } | |
1095 | ||
1096 | if (lm_addr == 0) | |
1097 | { | |
1098 | CORE_ADDR r_debug = get_r_debug<T> (target, pid); | |
1099 | ||
1100 | /* We failed to find DT_DEBUG. Such situation will not change | |
1101 | for this inferior - do not retry it. Report it to GDB as | |
1102 | E01, see for the reasons at the GDB solib-svr4.c side. */ | |
1103 | if (r_debug == (CORE_ADDR) -1) | |
1104 | return -1; | |
1105 | ||
1106 | if (r_debug != 0) | |
1107 | { | |
1108 | CORE_ADDR map_offset = r_debug + lmo->r_map_offset; | |
1109 | if (read_one_ptr (target, map_offset, &lm_addr, ptr_size) != 0) | |
1110 | warning ("unable to read r_map from %s", | |
1111 | core_addr_to_string (map_offset)); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | std::string document = "<library-list-svr4 version=\"1.0\""; | |
1116 | ||
1117 | while (lm_addr | |
1118 | && read_one_ptr (target, lm_addr + lmo->l_name_offset, | |
1119 | &l_name, ptr_size) == 0 | |
1120 | && read_one_ptr (target, lm_addr + lmo->l_addr_offset, | |
1121 | &l_addr, ptr_size) == 0 | |
1122 | && read_one_ptr (target, lm_addr + lmo->l_ld_offset, | |
1123 | &l_ld, ptr_size) == 0 | |
1124 | && read_one_ptr (target, lm_addr + lmo->l_prev_offset, | |
1125 | &l_prev, ptr_size) == 0 | |
1126 | && read_one_ptr (target, lm_addr + lmo->l_next_offset, | |
1127 | &l_next, ptr_size) == 0) | |
1128 | { | |
1129 | if (lm_prev != l_prev) | |
1130 | { | |
1131 | warning ("Corrupted shared library list: 0x%lx != 0x%lx", | |
1132 | (long) lm_prev, (long) l_prev); | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | /* Ignore the first entry even if it has valid name as the first entry | |
1137 | corresponds to the main executable. The first entry should not be | |
1138 | skipped if the dynamic loader was loaded late by a static executable | |
1139 | (see solib-svr4.c parameter ignore_first). But in such case the main | |
1140 | executable does not have PT_DYNAMIC present and this function already | |
1141 | exited above due to failed get_r_debug. */ | |
1142 | if (lm_prev == 0) | |
1143 | string_appendf (document, " main-lm=\"0x%lx\"", | |
1144 | (unsigned long) lm_addr); | |
1145 | else | |
1146 | { | |
1147 | unsigned char libname[PATH_MAX]; | |
1148 | ||
1149 | /* Not checking for error because reading may stop before | |
1150 | we've got PATH_MAX worth of characters. */ | |
1151 | libname[0] = '\0'; | |
1152 | target->read_memory (l_name, libname, sizeof (libname) - 1); | |
1153 | libname[sizeof (libname) - 1] = '\0'; | |
1154 | if (libname[0] != '\0') | |
1155 | { | |
1156 | if (!header_done) | |
1157 | { | |
1158 | /* Terminate `<library-list-svr4'. */ | |
1159 | document += '>'; | |
1160 | header_done = 1; | |
1161 | } | |
1162 | ||
1163 | string_appendf (document, "<library name=\""); | |
1164 | xml_escape_text_append (&document, (char *) libname); | |
1165 | string_appendf (document, "\" lm=\"0x%lx\" " | |
1166 | "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>", | |
1167 | (unsigned long) lm_addr, (unsigned long) l_addr, | |
1168 | (unsigned long) l_ld); | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | lm_prev = lm_addr; | |
1173 | lm_addr = l_next; | |
1174 | } | |
1175 | ||
1176 | if (!header_done) | |
1177 | { | |
1178 | /* Empty list; terminate `<library-list-svr4'. */ | |
1179 | document += "/>"; | |
1180 | } | |
1181 | else | |
1182 | document += "</library-list-svr4>"; | |
1183 | ||
1184 | int document_len = document.length (); | |
1185 | if (offset < document_len) | |
1186 | document_len -= offset; | |
1187 | else | |
1188 | document_len = 0; | |
1189 | if (len > document_len) | |
1190 | len = document_len; | |
1191 | ||
1192 | memcpy (readbuf, document.data () + offset, len); | |
1193 | ||
1194 | return len; | |
1195 | } | |
1196 | ||
1197 | /* Return true if FILE is a 64-bit ELF file, | |
1198 | false if the file is not a 64-bit ELF file, | |
1199 | and error if the file is not accessible or doesn't exist. */ | |
1200 | ||
1201 | static bool | |
1202 | elf_64_file_p (const char *file) | |
1203 | { | |
1204 | int fd = gdb::handle_eintr<int> (-1, ::open, file, O_RDONLY); | |
1205 | if (fd < 0) | |
1206 | perror_with_name (("open")); | |
1207 | ||
1208 | Elf64_Ehdr header; | |
1209 | ssize_t ret = gdb::handle_eintr<ssize_t> (-1, ::read, fd, &header, sizeof (header)); | |
1210 | if (ret == -1) | |
1211 | perror_with_name (("read")); | |
1212 | gdb::handle_eintr<int> (-1, ::close, fd); | |
1213 | if (ret != sizeof (header)) | |
1214 | error ("Cannot read ELF file header: %s", file); | |
1215 | ||
1216 | if (header.e_ident[EI_MAG0] != ELFMAG0 | |
1217 | || header.e_ident[EI_MAG1] != ELFMAG1 | |
1218 | || header.e_ident[EI_MAG2] != ELFMAG2 | |
1219 | || header.e_ident[EI_MAG3] != ELFMAG3) | |
1220 | error ("Unrecognized ELF file header: %s", file); | |
1221 | ||
1222 | return header.e_ident[EI_CLASS] == ELFCLASS64; | |
1223 | } | |
1224 | ||
1225 | /* Construct qXfer:libraries-svr4:read reply. */ | |
1226 | ||
1227 | int | |
1228 | netbsd_process_target::qxfer_libraries_svr4 (const char *annex, | |
1229 | unsigned char *readbuf, | |
1230 | unsigned const char *writebuf, | |
1231 | CORE_ADDR offset, int len) | |
1232 | { | |
1233 | if (writebuf != nullptr) | |
1234 | return -2; | |
1235 | if (readbuf == nullptr) | |
1236 | return -1; | |
1237 | ||
1238 | struct process_info *proc = current_process (); | |
1239 | pid_t pid = proc->pid; | |
1240 | bool is_elf64 = elf_64_file_p (netbsd_nat::pid_to_exec_file (pid)); | |
1241 | ||
1242 | if (is_elf64) | |
1243 | return netbsd_qxfer_libraries_svr4<int64_t> (this, pid, annex, readbuf, | |
1244 | writebuf, offset, len); | |
1245 | else | |
1246 | return netbsd_qxfer_libraries_svr4<int32_t> (this, pid, annex, readbuf, | |
1247 | writebuf, offset, len); | |
1248 | } | |
1249 | ||
1250 | /* Implement the supports_qxfer_libraries_svr4 target_ops method. */ | |
1251 | ||
1252 | bool | |
1253 | netbsd_process_target::supports_qxfer_libraries_svr4 () | |
1254 | { | |
1255 | return true; | |
1256 | } | |
1257 | ||
1258 | /* Return the name of a file that can be opened to get the symbols for | |
1259 | the child process identified by PID. */ | |
1260 | ||
1261 | char * | |
1262 | netbsd_process_target::pid_to_exec_file (pid_t pid) | |
1263 | { | |
1264 | return const_cast<char *> (netbsd_nat::pid_to_exec_file (pid)); | |
1265 | } | |
1266 | ||
1267 | /* Implementation of the target_ops method "supports_pid_to_exec_file". */ | |
1268 | ||
1269 | bool | |
1270 | netbsd_process_target::supports_pid_to_exec_file () | |
1271 | { | |
1272 | return true; | |
1273 | } | |
1274 | ||
1275 | /* Implementation of the target_ops method "supports_hardware_single_step". */ | |
1276 | bool | |
1277 | netbsd_process_target::supports_hardware_single_step () | |
1278 | { | |
1279 | return true; | |
1280 | } | |
1281 | ||
1282 | /* Implementation of the target_ops method "sw_breakpoint_from_kind". */ | |
1283 | ||
1284 | const gdb_byte * | |
1285 | netbsd_process_target::sw_breakpoint_from_kind (int kind, int *size) | |
1286 | { | |
1287 | static gdb_byte brkpt[PTRACE_BREAKPOINT_SIZE] = {*PTRACE_BREAKPOINT}; | |
1288 | ||
1289 | *size = PTRACE_BREAKPOINT_SIZE; | |
1290 | ||
1291 | return brkpt; | |
1292 | } | |
1293 | ||
1294 | /* Implement the thread_name target_ops method. */ | |
1295 | ||
1296 | const char * | |
1297 | netbsd_process_target::thread_name (ptid_t ptid) | |
1298 | { | |
1299 | return netbsd_nat::thread_name (ptid); | |
1300 | } | |
1301 | ||
1302 | /* Implement the supports_catch_syscall target_ops method. */ | |
1303 | ||
1304 | bool | |
1305 | netbsd_process_target::supports_catch_syscall () | |
1306 | { | |
1307 | return true; | |
1308 | } | |
1309 | ||
1310 | /* Implement the supports_read_auxv target_ops method. */ | |
1311 | ||
1312 | bool | |
1313 | netbsd_process_target::supports_read_auxv () | |
1314 | { | |
1315 | return true; | |
1316 | } | |
1317 | ||
1318 | /* The NetBSD target ops object. */ | |
1319 | ||
1320 | static netbsd_process_target the_netbsd_target; | |
1321 | ||
1322 | void | |
1323 | initialize_low () | |
1324 | { | |
1325 | set_target_ops (&the_netbsd_target); | |
1326 | the_low_target.arch_setup (); | |
1327 | } |