Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
61baf725 | 3 | Copyright (C) 1988-2017 Free Software Foundation, Inc. |
5bf970f9 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
5bf970f9 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5bf970f9 AC |
19 | |
20 | #include "defs.h" | |
5bf970f9 | 21 | #include "command.h" |
2c4a536d MK |
22 | #include "inferior.h" |
23 | #include "inflow.h" | |
191c4426 | 24 | #include "terminal.h" |
5bf970f9 | 25 | #include "gdbcore.h" |
8785ced0 | 26 | #include "regcache.h" |
e3790375 | 27 | #include "nat/gdb_ptrace.h" |
34a17005 | 28 | #include "gdb_wait.h" |
5bf970f9 AC |
29 | #include <signal.h> |
30 | ||
2c0b251b | 31 | #include "inf-ptrace.h" |
2c4a536d | 32 | #include "inf-child.h" |
af990527 | 33 | #include "gdbthread.h" |
2c4a536d | 34 | |
c7c14b96 MK |
35 | \f |
36 | ||
735f54b4 MK |
37 | #ifdef PT_GET_PROCESS_STATE |
38 | ||
d83ad864 DB |
39 | /* Target hook for follow_fork. On entry and at return inferior_ptid is |
40 | the ptid of the followed inferior. */ | |
41 | ||
735f54b4 | 42 | static int |
07107ca6 LM |
43 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child, |
44 | int detach_fork) | |
735f54b4 | 45 | { |
d83ad864 | 46 | if (!follow_child) |
735f54b4 | 47 | { |
ebf3aa72 MK |
48 | struct thread_info *tp = inferior_thread (); |
49 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
191c4426 | 50 | |
b242c3c2 PA |
51 | /* Breakpoints have already been detached from the child by |
52 | infrun.c. */ | |
735f54b4 | 53 | |
d83ad864 | 54 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) |
735f54b4 MK |
55 | perror_with_name (("ptrace")); |
56 | } | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
e85e8e5e MK |
61 | static int |
62 | inf_ptrace_insert_fork_catchpoint (struct target_ops *self, int pid) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static int | |
68 | inf_ptrace_remove_fork_catchpoint (struct target_ops *self, int pid) | |
69 | { | |
70 | return 0; | |
71 | } | |
72 | ||
735f54b4 MK |
73 | #endif /* PT_GET_PROCESS_STATE */ |
74 | \f | |
75 | ||
4b8a1a28 | 76 | /* Prepare to be traced. */ |
5bf970f9 AC |
77 | |
78 | static void | |
c7c14b96 | 79 | inf_ptrace_me (void) |
5bf970f9 | 80 | { |
c7c14b96 | 81 | /* "Trace me, Dr. Memory!" */ |
0db8980c SDJ |
82 | if (ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3) 0, 0) < 0) |
83 | trace_start_error_with_name ("ptrace"); | |
5bf970f9 AC |
84 | } |
85 | ||
136d6dae VP |
86 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
87 | run, ALLARGS is a string containing the arguments to the program. | |
88 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
89 | chatty about it. */ | |
5bf970f9 AC |
90 | |
91 | static void | |
136d6dae VP |
92 | inf_ptrace_create_inferior (struct target_ops *ops, |
93 | char *exec_file, char *allargs, char **env, | |
94 | int from_tty) | |
5bf970f9 | 95 | { |
136d6dae VP |
96 | int pid; |
97 | ||
c0edd9ed JK |
98 | /* Do not change either targets above or the same target if already present. |
99 | The reason is the target stack is shared across multiple inferiors. */ | |
100 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 101 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
102 | |
103 | if (! ops_already_pushed) | |
104 | { | |
105 | /* Clear possible core file with its process_stratum. */ | |
106 | push_target (ops); | |
25f43500 | 107 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
108 | } |
109 | ||
136d6dae | 110 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 111 | NULL, NULL, NULL); |
136d6dae | 112 | |
25f43500 | 113 | discard_cleanups (back_to); |
5bf970f9 | 114 | |
c7c14b96 MK |
115 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
116 | ||
117 | /* On some targets, there must be some explicit actions taken after | |
118 | the inferior has been started up. */ | |
119 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
120 | } |
121 | ||
e4ef629d MK |
122 | #ifdef PT_GET_PROCESS_STATE |
123 | ||
124 | static void | |
2e97a79e | 125 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
126 | { |
127 | ptrace_event_t pe; | |
128 | ||
129 | /* Set the initial event mask. */ | |
130 | memset (&pe, 0, sizeof pe); | |
131 | pe.pe_set_event |= PTRACE_FORK; | |
132 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
133 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
134 | perror_with_name (("ptrace")); | |
135 | } | |
136 | ||
137 | #endif | |
138 | ||
4b8a1a28 MK |
139 | /* Clean up a rotting corpse of an inferior after it died. */ |
140 | ||
c7c14b96 | 141 | static void |
136d6dae | 142 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 143 | { |
4b8a1a28 MK |
144 | int status; |
145 | ||
146 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 147 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 148 | dealing with a process that we attached to. Such a process will |
3d450bdd | 149 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
150 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
151 | ||
c1ee2fb3 | 152 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
153 | } |
154 | ||
4b8a1a28 MK |
155 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
156 | be chatty about it. */ | |
5bf970f9 AC |
157 | |
158 | static void | |
c0939df1 | 159 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
160 | { |
161 | char *exec_file; | |
4b8a1a28 | 162 | pid_t pid; |
181e7f93 | 163 | struct inferior *inf; |
5bf970f9 | 164 | |
c0edd9ed JK |
165 | /* Do not change either targets above or the same target if already present. |
166 | The reason is the target stack is shared across multiple inferiors. */ | |
167 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 168 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 169 | |
74164c56 | 170 | pid = parse_pid_to_attach (args); |
5bf970f9 | 171 | |
f6ffd89b | 172 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 173 | error (_("I refuse to debug myself!")); |
5bf970f9 | 174 | |
c0edd9ed JK |
175 | if (! ops_already_pushed) |
176 | { | |
177 | /* target_pid_to_str already uses the target. Also clear possible core | |
178 | file with its process_stratum. */ | |
179 | push_target (ops); | |
25f43500 | 180 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
181 | } |
182 | ||
5bf970f9 AC |
183 | if (from_tty) |
184 | { | |
4b8a1a28 | 185 | exec_file = get_exec_file (0); |
5bf970f9 AC |
186 | |
187 | if (exec_file) | |
a3f17187 | 188 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
189 | target_pid_to_str (pid_to_ptid (pid))); |
190 | else | |
a3f17187 | 191 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
192 | target_pid_to_str (pid_to_ptid (pid))); |
193 | ||
194 | gdb_flush (gdb_stdout); | |
195 | } | |
196 | ||
6e1e94ea MK |
197 | #ifdef PT_ATTACH |
198 | errno = 0; | |
4b8a1a28 | 199 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 200 | if (errno != 0) |
e2e0b3e5 | 201 | perror_with_name (("ptrace")); |
6e1e94ea | 202 | #else |
8a3fe4f8 | 203 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 204 | #endif |
5bf970f9 | 205 | |
6c95b8df PA |
206 | inf = current_inferior (); |
207 | inferior_appeared (inf, pid); | |
181e7f93 | 208 | inf->attach_flag = 1; |
6c95b8df | 209 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 210 | |
af990527 PA |
211 | /* Always add a main thread. If some target extends the ptrace |
212 | target, it should decorate the ptid later with more info. */ | |
213 | add_thread_silent (inferior_ptid); | |
214 | ||
25f43500 | 215 | discard_cleanups (back_to); |
5bf970f9 AC |
216 | } |
217 | ||
e4ef629d MK |
218 | #ifdef PT_GET_PROCESS_STATE |
219 | ||
460fac3c | 220 | static void |
f045800c | 221 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
222 | { |
223 | ptrace_event_t pe; | |
224 | ||
225 | /* Set the initial event mask. */ | |
226 | memset (&pe, 0, sizeof pe); | |
227 | pe.pe_set_event |= PTRACE_FORK; | |
228 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
229 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
230 | perror_with_name (("ptrace")); | |
231 | } | |
232 | ||
233 | #endif | |
234 | ||
4b8a1a28 | 235 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 236 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
237 | |
238 | static void | |
52554a0e | 239 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 240 | { |
4b8a1a28 | 241 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 242 | int sig = 0; |
5bf970f9 | 243 | |
0f48b757 | 244 | target_announce_detach (from_tty); |
5bf970f9 | 245 | if (args) |
6e1e94ea | 246 | sig = atoi (args); |
5bf970f9 | 247 | |
6e1e94ea | 248 | #ifdef PT_DETACH |
4b8a1a28 | 249 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 250 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
251 | previously attached to the inferior. It *might* work if we |
252 | started the process ourselves. */ | |
6e1e94ea | 253 | errno = 0; |
4b8a1a28 | 254 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 255 | if (errno != 0) |
e2e0b3e5 | 256 | perror_with_name (("ptrace")); |
6e1e94ea | 257 | #else |
8a3fe4f8 | 258 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 259 | #endif |
5bf970f9 | 260 | |
ced2dffb PA |
261 | inf_ptrace_detach_success (ops); |
262 | } | |
263 | ||
264 | /* See inf-ptrace.h. */ | |
265 | ||
266 | void | |
267 | inf_ptrace_detach_success (struct target_ops *ops) | |
268 | { | |
269 | pid_t pid = ptid_get_pid (inferior_ptid); | |
270 | ||
5bf970f9 | 271 | inferior_ptid = null_ptid; |
7f9f62ba | 272 | detach_inferior (pid); |
7a7d3353 | 273 | |
6a3cb8e8 | 274 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
275 | } |
276 | ||
4b8a1a28 MK |
277 | /* Kill the inferior. */ |
278 | ||
5bf970f9 | 279 | static void |
7d85a9c0 | 280 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 281 | { |
4b8a1a28 | 282 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 283 | int status; |
c7c14b96 MK |
284 | |
285 | if (pid == 0) | |
286 | return; | |
287 | ||
4b8a1a28 MK |
288 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
289 | waitpid (pid, &status, 0); | |
290 | ||
bc1e6c81 | 291 | target_mourn_inferior (inferior_ptid); |
5bf970f9 AC |
292 | } |
293 | ||
bfedc46a | 294 | /* Interrupt the inferior. */ |
c7c14b96 | 295 | |
5bf970f9 | 296 | static void |
bfedc46a | 297 | inf_ptrace_interrupt (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 298 | { |
4b8a1a28 MK |
299 | /* Send a SIGINT to the process group. This acts just like the user |
300 | typed a ^C on the controlling terminal. Note that using a | |
301 | negative process number in kill() is a System V-ism. The proper | |
302 | BSD interface is killpg(). However, all modern BSDs support the | |
303 | System V interface too. */ | |
7e1789f5 | 304 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
305 | } |
306 | ||
90ad5e1d PA |
307 | /* Return which PID to pass to ptrace in order to observe/control the |
308 | tracee identified by PTID. */ | |
309 | ||
94309df7 | 310 | pid_t |
90ad5e1d PA |
311 | get_ptrace_pid (ptid_t ptid) |
312 | { | |
313 | pid_t pid; | |
314 | ||
315 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
316 | dealing with a non-threaded program/target. */ | |
317 | pid = ptid_get_lwp (ptid); | |
318 | if (pid == 0) | |
319 | pid = ptid_get_pid (ptid); | |
320 | return pid; | |
321 | } | |
322 | ||
4b8a1a28 MK |
323 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
324 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
325 | that signal. */ | |
5bf970f9 AC |
326 | |
327 | static void | |
28439f5e | 328 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 329 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 330 | { |
90ad5e1d | 331 | pid_t pid; |
a96d9b2e | 332 | int request; |
c7c14b96 | 333 | |
90ad5e1d | 334 | if (ptid_equal (minus_one_ptid, ptid)) |
4b8a1a28 MK |
335 | /* Resume all threads. Traditionally ptrace() only supports |
336 | single-threaded processes, so simply resume the inferior. */ | |
c1593e4f | 337 | pid = ptid_get_pid (inferior_ptid); |
90ad5e1d PA |
338 | else |
339 | pid = get_ptrace_pid (ptid); | |
c7c14b96 | 340 | |
a96d9b2e SDJ |
341 | if (catch_syscall_enabled () > 0) |
342 | request = PT_SYSCALL; | |
343 | else | |
344 | request = PT_CONTINUE; | |
345 | ||
c7c14b96 MK |
346 | if (step) |
347 | { | |
348 | /* If this system does not support PT_STEP, a higher level | |
349 | function will have called single_step() to transmute the step | |
350 | request into a continue request (by setting breakpoints on | |
351 | all possible successor instructions), so we don't have to | |
352 | worry about that here. */ | |
353 | request = PT_STEP; | |
354 | } | |
355 | ||
356 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
357 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 358 | already written a new program counter value to the child. */ |
c7c14b96 | 359 | errno = 0; |
2ea28649 | 360 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
361 | if (errno != 0) |
362 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
363 | } |
364 | ||
4b8a1a28 MK |
365 | /* Wait for the child specified by PTID to do something. Return the |
366 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
367 | the status in *OURSTATUS. */ | |
5bf970f9 | 368 | |
c7c14b96 | 369 | static ptid_t |
117de6a9 | 370 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 371 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 372 | { |
4b8a1a28 MK |
373 | pid_t pid; |
374 | int status, save_errno; | |
5bf970f9 | 375 | |
c7c14b96 MK |
376 | do |
377 | { | |
4b8a1a28 | 378 | set_sigint_trap (); |
5bf970f9 | 379 | |
4b8a1a28 MK |
380 | do |
381 | { | |
382 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
383 | save_errno = errno; | |
384 | } | |
385 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 386 | |
c7c14b96 | 387 | clear_sigint_trap (); |
5bf970f9 | 388 | |
c7c14b96 MK |
389 | if (pid == -1) |
390 | { | |
c7c14b96 | 391 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 392 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
393 | safe_strerror (save_errno)); |
394 | ||
395 | /* Claim it exited with unknown signal. */ | |
396 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 397 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 398 | return inferior_ptid; |
c7c14b96 MK |
399 | } |
400 | ||
4b8a1a28 MK |
401 | /* Ignore terminated detached child processes. */ |
402 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
403 | pid = -1; | |
c7c14b96 | 404 | } |
4b8a1a28 | 405 | while (pid == -1); |
c7c14b96 | 406 | |
735f54b4 MK |
407 | #ifdef PT_GET_PROCESS_STATE |
408 | if (WIFSTOPPED (status)) | |
409 | { | |
410 | ptrace_state_t pe; | |
411 | pid_t fpid; | |
412 | ||
413 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
414 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
415 | perror_with_name (("ptrace")); | |
416 | ||
417 | switch (pe.pe_report_event) | |
418 | { | |
419 | case PTRACE_FORK: | |
420 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 421 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
422 | |
423 | /* Make sure the other end of the fork is stopped too. */ | |
424 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
425 | if (fpid == -1) | |
426 | perror_with_name (("waitpid")); | |
427 | ||
428 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
429 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
430 | perror_with_name (("ptrace")); | |
431 | ||
432 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
433 | gdb_assert (pe.pe_other_pid == pid); | |
434 | if (fpid == ptid_get_pid (inferior_ptid)) | |
435 | { | |
3a3e9ee3 | 436 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
437 | return pid_to_ptid (fpid); |
438 | } | |
439 | ||
440 | return pid_to_ptid (pid); | |
441 | } | |
442 | } | |
443 | #endif | |
444 | ||
c7c14b96 MK |
445 | store_waitstatus (ourstatus, status); |
446 | return pid_to_ptid (pid); | |
5bf970f9 AC |
447 | } |
448 | ||
edcc890f | 449 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 450 | |
9b409511 | 451 | static enum target_xfer_status |
5bf970f9 | 452 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
453 | const char *annex, gdb_byte *readbuf, |
454 | const gdb_byte *writebuf, | |
9b409511 | 455 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 456 | { |
4b8a1a28 MK |
457 | pid_t pid = ptid_get_pid (inferior_ptid); |
458 | ||
5bf970f9 AC |
459 | switch (object) |
460 | { | |
461 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
462 | #ifdef PT_IO |
463 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
464 | request that promises to be much more efficient in reading | |
465 | and writing data in the traced process's address space. */ | |
466 | { | |
467 | struct ptrace_io_desc piod; | |
4b8a1a28 | 468 | |
f929a579 | 469 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
470 | for instruction and data. However, on OpenBSD 3.9 and |
471 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
472 | mapped read-only. Since most code segments will be | |
473 | read-only, using PIOD_WRITE_D will prevent us from | |
474 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
475 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
476 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
477 | piod.piod_offs = (void *) (long) offset; | |
478 | piod.piod_len = len; | |
479 | ||
480 | errno = 0; | |
4b8a1a28 | 481 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 482 | { |
9b409511 | 483 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
484 | *xfered_len = piod.piod_len; |
485 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 486 | } |
f929a579 AC |
487 | /* If the PT_IO request is somehow not supported, fallback on |
488 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
489 | to indicate failure. */ | |
490 | if (errno != EINVAL) | |
9b409511 | 491 | return TARGET_XFER_EOF; |
f929a579 AC |
492 | } |
493 | #endif | |
494 | { | |
495 | union | |
496 | { | |
497 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 498 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
499 | } buffer; |
500 | ULONGEST rounded_offset; | |
9b409511 | 501 | ULONGEST partial_len; |
4b8a1a28 | 502 | |
cb85a953 AC |
503 | /* Round the start offset down to the next long word |
504 | boundary. */ | |
f929a579 | 505 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 506 | |
cb85a953 AC |
507 | /* Since ptrace will transfer a single word starting at that |
508 | rounded_offset the partial_len needs to be adjusted down to | |
509 | that (remember this function only does a single transfer). | |
510 | Should the required length be even less, adjust it down | |
511 | again. */ | |
512 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
513 | if (partial_len > len) | |
f929a579 | 514 | partial_len = len; |
4b8a1a28 | 515 | |
f929a579 AC |
516 | if (writebuf) |
517 | { | |
cb85a953 AC |
518 | /* If OFFSET:PARTIAL_LEN is smaller than |
519 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
520 | be needed. Read in the entire word. */ | |
f929a579 | 521 | if (rounded_offset < offset |
cb85a953 AC |
522 | || (offset + partial_len |
523 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 524 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 525 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
526 | (PTRACE_TYPE_ARG3)(uintptr_t) |
527 | rounded_offset, 0); | |
4b8a1a28 | 528 | |
f929a579 AC |
529 | /* Copy data to be written over corresponding part of |
530 | buffer. */ | |
f6ffd89b MK |
531 | memcpy (buffer.byte + (offset - rounded_offset), |
532 | writebuf, partial_len); | |
4b8a1a28 | 533 | |
f929a579 | 534 | errno = 0; |
4b8a1a28 | 535 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
536 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
537 | buffer.word); | |
f929a579 AC |
538 | if (errno) |
539 | { | |
540 | /* Using the appropriate one (I or D) is necessary for | |
541 | Gould NP1, at least. */ | |
542 | errno = 0; | |
4b8a1a28 | 543 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
544 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
545 | buffer.word); | |
f929a579 | 546 | if (errno) |
9b409511 | 547 | return TARGET_XFER_EOF; |
f929a579 AC |
548 | } |
549 | } | |
4b8a1a28 | 550 | |
f929a579 AC |
551 | if (readbuf) |
552 | { | |
553 | errno = 0; | |
4b8a1a28 | 554 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
555 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
556 | 0); | |
f929a579 | 557 | if (errno) |
9b409511 | 558 | return TARGET_XFER_EOF; |
f929a579 AC |
559 | /* Copy appropriate bytes out of the buffer. */ |
560 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
561 | partial_len); | |
562 | } | |
4b8a1a28 | 563 | |
9b409511 YQ |
564 | *xfered_len = partial_len; |
565 | return TARGET_XFER_OK; | |
f929a579 | 566 | } |
5bf970f9 AC |
567 | |
568 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 569 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
570 | |
571 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
572 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
573 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
574 | request that allows us to read the auxilliary vector. Other | |
575 | BSD's may follow if they feel the need to support PIE. */ | |
576 | { | |
577 | struct ptrace_io_desc piod; | |
578 | ||
579 | if (writebuf) | |
2ed4b548 | 580 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
581 | piod.piod_op = PIOD_READ_AUXV; |
582 | piod.piod_addr = readbuf; | |
583 | piod.piod_offs = (void *) (long) offset; | |
584 | piod.piod_len = len; | |
585 | ||
586 | errno = 0; | |
587 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 588 | { |
9b409511 | 589 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
590 | *xfered_len = piod.piod_len; |
591 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 592 | } |
e8ace1c0 MK |
593 | } |
594 | #endif | |
2ed4b548 | 595 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
596 | |
597 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 598 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
599 | |
600 | default: | |
2ed4b548 | 601 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
602 | } |
603 | } | |
604 | ||
4b8a1a28 | 605 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
606 | |
607 | static int | |
28439f5e | 608 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 609 | { |
4b8a1a28 MK |
610 | /* ??? Is kill the right way to do this? */ |
611 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
612 | } |
613 | ||
614 | /* Print status information about what we're accessing. */ | |
615 | ||
616 | static void | |
617 | inf_ptrace_files_info (struct target_ops *ignore) | |
618 | { | |
181e7f93 PA |
619 | struct inferior *inf = current_inferior (); |
620 | ||
4b8a1a28 | 621 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 622 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 623 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
624 | } |
625 | ||
117de6a9 PA |
626 | static char * |
627 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
628 | { | |
629 | return normal_pid_to_str (ptid); | |
630 | } | |
631 | ||
e8ace1c0 MK |
632 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
633 | ||
634 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
635 | Return 0 if *READPTR is already at the end of the buffer. | |
636 | Return -1 if there is insufficient buffer for a whole entry. | |
637 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
638 | ||
639 | static int | |
640 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
641 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
642 | { | |
f5656ead TT |
643 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
644 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
645 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
646 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 647 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
648 | gdb_byte *ptr = *readptr; |
649 | ||
650 | if (endptr == ptr) | |
651 | return 0; | |
652 | ||
653 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
654 | return -1; | |
655 | ||
656 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
657 | ptr += sizeof_auxv_val; /* Alignment. */ | |
658 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
659 | ptr += sizeof_auxv_val; | |
660 | ||
661 | *readptr = ptr; | |
662 | return 1; | |
663 | } | |
664 | ||
665 | #endif | |
666 | ||
8785ced0 MK |
667 | /* Create a prototype ptrace target. The client can override it with |
668 | local methods. */ | |
669 | ||
5bf970f9 AC |
670 | struct target_ops * |
671 | inf_ptrace_target (void) | |
672 | { | |
673 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 674 | |
5bf970f9 | 675 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
676 | t->to_detach = inf_ptrace_detach; |
677 | t->to_resume = inf_ptrace_resume; | |
678 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 679 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 680 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 681 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
682 | #ifdef PT_GET_PROCESS_STATE |
683 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e85e8e5e MK |
684 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; |
685 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; | |
e4ef629d MK |
686 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
687 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 688 | #endif |
5bf970f9 | 689 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 690 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 691 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
bfedc46a | 692 | t->to_interrupt = inf_ptrace_interrupt; |
c7c14b96 | 693 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
694 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
695 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
696 | #endif | |
8785ced0 MK |
697 | |
698 | return t; | |
699 | } | |
700 | \f | |
701 | ||
4b8a1a28 | 702 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 703 | where a particular register is stored. */ |
7714d83a | 704 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
705 | |
706 | /* Fetch register REGNUM from the inferior. */ | |
707 | ||
708 | static void | |
56be3814 | 709 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 710 | { |
3b3b1423 | 711 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
712 | CORE_ADDR addr; |
713 | size_t size; | |
714 | PTRACE_TYPE_RET *buf; | |
715 | int pid, i; | |
716 | ||
7714d83a | 717 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 718 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 719 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 720 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 721 | { |
56be3814 | 722 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
723 | return; |
724 | } | |
725 | ||
8785ced0 | 726 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 727 | separate processes. */ |
8785ced0 MK |
728 | pid = ptid_get_lwp (inferior_ptid); |
729 | if (pid == 0) | |
730 | pid = ptid_get_pid (inferior_ptid); | |
731 | ||
3b3b1423 | 732 | size = register_size (gdbarch, regnum); |
8785ced0 | 733 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 734 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 735 | |
10d6c8cd | 736 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
737 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
738 | { | |
739 | errno = 0; | |
f7dd0ed7 | 740 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 741 | if (errno != 0) |
4b8a1a28 | 742 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 743 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 744 | regnum, safe_strerror (errno)); |
8785ced0 MK |
745 | |
746 | addr += sizeof (PTRACE_TYPE_RET); | |
747 | } | |
56be3814 | 748 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
749 | } |
750 | ||
751 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
752 | for all registers. */ | |
753 | ||
754 | static void | |
28439f5e PA |
755 | inf_ptrace_fetch_registers (struct target_ops *ops, |
756 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
757 | { |
758 | if (regnum == -1) | |
3b3b1423 UW |
759 | for (regnum = 0; |
760 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
761 | regnum++) | |
56be3814 | 762 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 763 | else |
56be3814 | 764 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
765 | } |
766 | ||
767 | /* Store register REGNUM into the inferior. */ | |
768 | ||
769 | static void | |
56be3814 | 770 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 771 | { |
3b3b1423 | 772 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
773 | CORE_ADDR addr; |
774 | size_t size; | |
775 | PTRACE_TYPE_RET *buf; | |
776 | int pid, i; | |
777 | ||
7714d83a | 778 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 779 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 780 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 781 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
782 | return; |
783 | ||
8785ced0 | 784 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 785 | separate processes. */ |
8785ced0 MK |
786 | pid = ptid_get_lwp (inferior_ptid); |
787 | if (pid == 0) | |
788 | pid = ptid_get_pid (inferior_ptid); | |
789 | ||
3b3b1423 | 790 | size = register_size (gdbarch, regnum); |
8785ced0 | 791 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 792 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 793 | |
10d6c8cd | 794 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 795 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
796 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
797 | { | |
798 | errno = 0; | |
f7dd0ed7 | 799 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 800 | if (errno != 0) |
4b8a1a28 | 801 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 802 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 803 | regnum, safe_strerror (errno)); |
8785ced0 MK |
804 | |
805 | addr += sizeof (PTRACE_TYPE_RET); | |
806 | } | |
807 | } | |
808 | ||
809 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
810 | this for all registers. */ | |
811 | ||
2c0b251b | 812 | static void |
28439f5e PA |
813 | inf_ptrace_store_registers (struct target_ops *ops, |
814 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
815 | { |
816 | if (regnum == -1) | |
3b3b1423 UW |
817 | for (regnum = 0; |
818 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
819 | regnum++) | |
56be3814 | 820 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 821 | else |
56be3814 | 822 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
823 | } |
824 | ||
825 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
826 | a function returning the offset within the user area where a | |
827 | particular register is stored. */ | |
828 | ||
829 | struct target_ops * | |
7714d83a UW |
830 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
831 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
832 | { |
833 | struct target_ops *t = inf_ptrace_target(); | |
834 | ||
835 | gdb_assert (register_u_offset); | |
836 | inf_ptrace_register_u_offset = register_u_offset; | |
837 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
838 | t->to_store_registers = inf_ptrace_store_registers; | |
839 | ||
5bf970f9 AC |
840 | return t; |
841 | } |