Commit | Line | Data |
---|---|---|
2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
618f726f | 3 | Copyright (C) 1988-2016 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!" */ |
4b8a1a28 | 82 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
83 | } |
84 | ||
136d6dae VP |
85 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
86 | run, ALLARGS is a string containing the arguments to the program. | |
87 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
88 | chatty about it. */ | |
5bf970f9 AC |
89 | |
90 | static void | |
136d6dae VP |
91 | inf_ptrace_create_inferior (struct target_ops *ops, |
92 | char *exec_file, char *allargs, char **env, | |
93 | int from_tty) | |
5bf970f9 | 94 | { |
136d6dae VP |
95 | int pid; |
96 | ||
c0edd9ed JK |
97 | /* Do not change either targets above or the same target if already present. |
98 | The reason is the target stack is shared across multiple inferiors. */ | |
99 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 100 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
101 | |
102 | if (! ops_already_pushed) | |
103 | { | |
104 | /* Clear possible core file with its process_stratum. */ | |
105 | push_target (ops); | |
25f43500 | 106 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
107 | } |
108 | ||
136d6dae | 109 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 110 | NULL, NULL, NULL); |
136d6dae | 111 | |
25f43500 | 112 | discard_cleanups (back_to); |
5bf970f9 | 113 | |
c7c14b96 MK |
114 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
115 | ||
116 | /* On some targets, there must be some explicit actions taken after | |
117 | the inferior has been started up. */ | |
118 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
119 | } |
120 | ||
e4ef629d MK |
121 | #ifdef PT_GET_PROCESS_STATE |
122 | ||
123 | static void | |
2e97a79e | 124 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
125 | { |
126 | ptrace_event_t pe; | |
127 | ||
128 | /* Set the initial event mask. */ | |
129 | memset (&pe, 0, sizeof pe); | |
130 | pe.pe_set_event |= PTRACE_FORK; | |
131 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
132 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
133 | perror_with_name (("ptrace")); | |
134 | } | |
135 | ||
136 | #endif | |
137 | ||
4b8a1a28 MK |
138 | /* Clean up a rotting corpse of an inferior after it died. */ |
139 | ||
c7c14b96 | 140 | static void |
136d6dae | 141 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 142 | { |
4b8a1a28 MK |
143 | int status; |
144 | ||
145 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 146 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 147 | dealing with a process that we attached to. Such a process will |
3d450bdd | 148 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
149 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
150 | ||
c1ee2fb3 | 151 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
152 | } |
153 | ||
4b8a1a28 MK |
154 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
155 | be chatty about it. */ | |
5bf970f9 AC |
156 | |
157 | static void | |
c0939df1 | 158 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
159 | { |
160 | char *exec_file; | |
4b8a1a28 | 161 | pid_t pid; |
181e7f93 | 162 | struct inferior *inf; |
5bf970f9 | 163 | |
c0edd9ed JK |
164 | /* Do not change either targets above or the same target if already present. |
165 | The reason is the target stack is shared across multiple inferiors. */ | |
166 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 167 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 168 | |
74164c56 | 169 | pid = parse_pid_to_attach (args); |
5bf970f9 | 170 | |
f6ffd89b | 171 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 172 | error (_("I refuse to debug myself!")); |
5bf970f9 | 173 | |
c0edd9ed JK |
174 | if (! ops_already_pushed) |
175 | { | |
176 | /* target_pid_to_str already uses the target. Also clear possible core | |
177 | file with its process_stratum. */ | |
178 | push_target (ops); | |
25f43500 | 179 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
180 | } |
181 | ||
5bf970f9 AC |
182 | if (from_tty) |
183 | { | |
4b8a1a28 | 184 | exec_file = get_exec_file (0); |
5bf970f9 AC |
185 | |
186 | if (exec_file) | |
a3f17187 | 187 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
188 | target_pid_to_str (pid_to_ptid (pid))); |
189 | else | |
a3f17187 | 190 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
191 | target_pid_to_str (pid_to_ptid (pid))); |
192 | ||
193 | gdb_flush (gdb_stdout); | |
194 | } | |
195 | ||
6e1e94ea MK |
196 | #ifdef PT_ATTACH |
197 | errno = 0; | |
4b8a1a28 | 198 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 199 | if (errno != 0) |
e2e0b3e5 | 200 | perror_with_name (("ptrace")); |
6e1e94ea | 201 | #else |
8a3fe4f8 | 202 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 203 | #endif |
5bf970f9 | 204 | |
6c95b8df PA |
205 | inf = current_inferior (); |
206 | inferior_appeared (inf, pid); | |
181e7f93 | 207 | inf->attach_flag = 1; |
6c95b8df | 208 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 209 | |
af990527 PA |
210 | /* Always add a main thread. If some target extends the ptrace |
211 | target, it should decorate the ptid later with more info. */ | |
212 | add_thread_silent (inferior_ptid); | |
213 | ||
25f43500 | 214 | discard_cleanups (back_to); |
5bf970f9 AC |
215 | } |
216 | ||
e4ef629d MK |
217 | #ifdef PT_GET_PROCESS_STATE |
218 | ||
460fac3c | 219 | static void |
f045800c | 220 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
221 | { |
222 | ptrace_event_t pe; | |
223 | ||
224 | /* Set the initial event mask. */ | |
225 | memset (&pe, 0, sizeof pe); | |
226 | pe.pe_set_event |= PTRACE_FORK; | |
227 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
228 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
229 | perror_with_name (("ptrace")); | |
230 | } | |
231 | ||
232 | #endif | |
233 | ||
4b8a1a28 | 234 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 235 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
236 | |
237 | static void | |
52554a0e | 238 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 239 | { |
4b8a1a28 | 240 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 241 | int sig = 0; |
5bf970f9 | 242 | |
0f48b757 | 243 | target_announce_detach (from_tty); |
5bf970f9 | 244 | if (args) |
6e1e94ea | 245 | sig = atoi (args); |
5bf970f9 | 246 | |
6e1e94ea | 247 | #ifdef PT_DETACH |
4b8a1a28 | 248 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 249 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
250 | previously attached to the inferior. It *might* work if we |
251 | started the process ourselves. */ | |
6e1e94ea | 252 | errno = 0; |
4b8a1a28 | 253 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 254 | if (errno != 0) |
e2e0b3e5 | 255 | perror_with_name (("ptrace")); |
6e1e94ea | 256 | #else |
8a3fe4f8 | 257 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 258 | #endif |
5bf970f9 AC |
259 | |
260 | inferior_ptid = null_ptid; | |
7f9f62ba | 261 | detach_inferior (pid); |
7a7d3353 | 262 | |
6a3cb8e8 | 263 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
264 | } |
265 | ||
4b8a1a28 MK |
266 | /* Kill the inferior. */ |
267 | ||
5bf970f9 | 268 | static void |
7d85a9c0 | 269 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 270 | { |
4b8a1a28 | 271 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 272 | int status; |
c7c14b96 MK |
273 | |
274 | if (pid == 0) | |
275 | return; | |
276 | ||
4b8a1a28 MK |
277 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
278 | waitpid (pid, &status, 0); | |
279 | ||
c7c14b96 | 280 | target_mourn_inferior (); |
5bf970f9 AC |
281 | } |
282 | ||
bfedc46a | 283 | /* Interrupt the inferior. */ |
c7c14b96 | 284 | |
5bf970f9 | 285 | static void |
bfedc46a | 286 | inf_ptrace_interrupt (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 287 | { |
4b8a1a28 MK |
288 | /* Send a SIGINT to the process group. This acts just like the user |
289 | typed a ^C on the controlling terminal. Note that using a | |
290 | negative process number in kill() is a System V-ism. The proper | |
291 | BSD interface is killpg(). However, all modern BSDs support the | |
292 | System V interface too. */ | |
7e1789f5 | 293 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
294 | } |
295 | ||
90ad5e1d PA |
296 | /* Return which PID to pass to ptrace in order to observe/control the |
297 | tracee identified by PTID. */ | |
298 | ||
94309df7 | 299 | pid_t |
90ad5e1d PA |
300 | get_ptrace_pid (ptid_t ptid) |
301 | { | |
302 | pid_t pid; | |
303 | ||
304 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
305 | dealing with a non-threaded program/target. */ | |
306 | pid = ptid_get_lwp (ptid); | |
307 | if (pid == 0) | |
308 | pid = ptid_get_pid (ptid); | |
309 | return pid; | |
310 | } | |
311 | ||
4b8a1a28 MK |
312 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
313 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
314 | that signal. */ | |
5bf970f9 AC |
315 | |
316 | static void | |
28439f5e | 317 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 318 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 319 | { |
90ad5e1d | 320 | pid_t pid; |
a96d9b2e | 321 | int request; |
c7c14b96 | 322 | |
90ad5e1d | 323 | if (ptid_equal (minus_one_ptid, ptid)) |
4b8a1a28 MK |
324 | /* Resume all threads. Traditionally ptrace() only supports |
325 | single-threaded processes, so simply resume the inferior. */ | |
c1593e4f | 326 | pid = ptid_get_pid (inferior_ptid); |
90ad5e1d PA |
327 | else |
328 | pid = get_ptrace_pid (ptid); | |
c7c14b96 | 329 | |
a96d9b2e SDJ |
330 | if (catch_syscall_enabled () > 0) |
331 | request = PT_SYSCALL; | |
332 | else | |
333 | request = PT_CONTINUE; | |
334 | ||
c7c14b96 MK |
335 | if (step) |
336 | { | |
337 | /* If this system does not support PT_STEP, a higher level | |
338 | function will have called single_step() to transmute the step | |
339 | request into a continue request (by setting breakpoints on | |
340 | all possible successor instructions), so we don't have to | |
341 | worry about that here. */ | |
342 | request = PT_STEP; | |
343 | } | |
344 | ||
345 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
346 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 347 | already written a new program counter value to the child. */ |
c7c14b96 | 348 | errno = 0; |
2ea28649 | 349 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
350 | if (errno != 0) |
351 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
352 | } |
353 | ||
4b8a1a28 MK |
354 | /* Wait for the child specified by PTID to do something. Return the |
355 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
356 | the status in *OURSTATUS. */ | |
5bf970f9 | 357 | |
c7c14b96 | 358 | static ptid_t |
117de6a9 | 359 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 360 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 361 | { |
4b8a1a28 MK |
362 | pid_t pid; |
363 | int status, save_errno; | |
5bf970f9 | 364 | |
c7c14b96 MK |
365 | do |
366 | { | |
4b8a1a28 | 367 | set_sigint_trap (); |
5bf970f9 | 368 | |
4b8a1a28 MK |
369 | do |
370 | { | |
371 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
372 | save_errno = errno; | |
373 | } | |
374 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 375 | |
c7c14b96 | 376 | clear_sigint_trap (); |
5bf970f9 | 377 | |
c7c14b96 MK |
378 | if (pid == -1) |
379 | { | |
c7c14b96 | 380 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 381 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
382 | safe_strerror (save_errno)); |
383 | ||
384 | /* Claim it exited with unknown signal. */ | |
385 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 386 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 387 | return inferior_ptid; |
c7c14b96 MK |
388 | } |
389 | ||
4b8a1a28 MK |
390 | /* Ignore terminated detached child processes. */ |
391 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
392 | pid = -1; | |
c7c14b96 | 393 | } |
4b8a1a28 | 394 | while (pid == -1); |
c7c14b96 | 395 | |
735f54b4 MK |
396 | #ifdef PT_GET_PROCESS_STATE |
397 | if (WIFSTOPPED (status)) | |
398 | { | |
399 | ptrace_state_t pe; | |
400 | pid_t fpid; | |
401 | ||
402 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
403 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
404 | perror_with_name (("ptrace")); | |
405 | ||
406 | switch (pe.pe_report_event) | |
407 | { | |
408 | case PTRACE_FORK: | |
409 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 410 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
411 | |
412 | /* Make sure the other end of the fork is stopped too. */ | |
413 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
414 | if (fpid == -1) | |
415 | perror_with_name (("waitpid")); | |
416 | ||
417 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
418 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
419 | perror_with_name (("ptrace")); | |
420 | ||
421 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
422 | gdb_assert (pe.pe_other_pid == pid); | |
423 | if (fpid == ptid_get_pid (inferior_ptid)) | |
424 | { | |
3a3e9ee3 | 425 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
426 | return pid_to_ptid (fpid); |
427 | } | |
428 | ||
429 | return pid_to_ptid (pid); | |
430 | } | |
431 | } | |
432 | #endif | |
433 | ||
c7c14b96 MK |
434 | store_waitstatus (ourstatus, status); |
435 | return pid_to_ptid (pid); | |
5bf970f9 AC |
436 | } |
437 | ||
edcc890f | 438 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 439 | |
9b409511 | 440 | static enum target_xfer_status |
5bf970f9 | 441 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
442 | const char *annex, gdb_byte *readbuf, |
443 | const gdb_byte *writebuf, | |
9b409511 | 444 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 445 | { |
4b8a1a28 MK |
446 | pid_t pid = ptid_get_pid (inferior_ptid); |
447 | ||
5bf970f9 AC |
448 | switch (object) |
449 | { | |
450 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
451 | #ifdef PT_IO |
452 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
453 | request that promises to be much more efficient in reading | |
454 | and writing data in the traced process's address space. */ | |
455 | { | |
456 | struct ptrace_io_desc piod; | |
4b8a1a28 | 457 | |
f929a579 | 458 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
459 | for instruction and data. However, on OpenBSD 3.9 and |
460 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
461 | mapped read-only. Since most code segments will be | |
462 | read-only, using PIOD_WRITE_D will prevent us from | |
463 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
464 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
465 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
466 | piod.piod_offs = (void *) (long) offset; | |
467 | piod.piod_len = len; | |
468 | ||
469 | errno = 0; | |
4b8a1a28 | 470 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 471 | { |
9b409511 | 472 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
473 | *xfered_len = piod.piod_len; |
474 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 475 | } |
f929a579 AC |
476 | /* If the PT_IO request is somehow not supported, fallback on |
477 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
478 | to indicate failure. */ | |
479 | if (errno != EINVAL) | |
9b409511 | 480 | return TARGET_XFER_EOF; |
f929a579 AC |
481 | } |
482 | #endif | |
483 | { | |
484 | union | |
485 | { | |
486 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 487 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
488 | } buffer; |
489 | ULONGEST rounded_offset; | |
9b409511 | 490 | ULONGEST partial_len; |
4b8a1a28 | 491 | |
cb85a953 AC |
492 | /* Round the start offset down to the next long word |
493 | boundary. */ | |
f929a579 | 494 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 495 | |
cb85a953 AC |
496 | /* Since ptrace will transfer a single word starting at that |
497 | rounded_offset the partial_len needs to be adjusted down to | |
498 | that (remember this function only does a single transfer). | |
499 | Should the required length be even less, adjust it down | |
500 | again. */ | |
501 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
502 | if (partial_len > len) | |
f929a579 | 503 | partial_len = len; |
4b8a1a28 | 504 | |
f929a579 AC |
505 | if (writebuf) |
506 | { | |
cb85a953 AC |
507 | /* If OFFSET:PARTIAL_LEN is smaller than |
508 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
509 | be needed. Read in the entire word. */ | |
f929a579 | 510 | if (rounded_offset < offset |
cb85a953 AC |
511 | || (offset + partial_len |
512 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 513 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 514 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
515 | (PTRACE_TYPE_ARG3)(uintptr_t) |
516 | rounded_offset, 0); | |
4b8a1a28 | 517 | |
f929a579 AC |
518 | /* Copy data to be written over corresponding part of |
519 | buffer. */ | |
f6ffd89b MK |
520 | memcpy (buffer.byte + (offset - rounded_offset), |
521 | writebuf, partial_len); | |
4b8a1a28 | 522 | |
f929a579 | 523 | errno = 0; |
4b8a1a28 | 524 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
525 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
526 | buffer.word); | |
f929a579 AC |
527 | if (errno) |
528 | { | |
529 | /* Using the appropriate one (I or D) is necessary for | |
530 | Gould NP1, at least. */ | |
531 | errno = 0; | |
4b8a1a28 | 532 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
533 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
534 | buffer.word); | |
f929a579 | 535 | if (errno) |
9b409511 | 536 | return TARGET_XFER_EOF; |
f929a579 AC |
537 | } |
538 | } | |
4b8a1a28 | 539 | |
f929a579 AC |
540 | if (readbuf) |
541 | { | |
542 | errno = 0; | |
4b8a1a28 | 543 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
544 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
545 | 0); | |
f929a579 | 546 | if (errno) |
9b409511 | 547 | return TARGET_XFER_EOF; |
f929a579 AC |
548 | /* Copy appropriate bytes out of the buffer. */ |
549 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
550 | partial_len); | |
551 | } | |
4b8a1a28 | 552 | |
9b409511 YQ |
553 | *xfered_len = partial_len; |
554 | return TARGET_XFER_OK; | |
f929a579 | 555 | } |
5bf970f9 AC |
556 | |
557 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 558 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
559 | |
560 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
561 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
562 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
563 | request that allows us to read the auxilliary vector. Other | |
564 | BSD's may follow if they feel the need to support PIE. */ | |
565 | { | |
566 | struct ptrace_io_desc piod; | |
567 | ||
568 | if (writebuf) | |
2ed4b548 | 569 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
570 | piod.piod_op = PIOD_READ_AUXV; |
571 | piod.piod_addr = readbuf; | |
572 | piod.piod_offs = (void *) (long) offset; | |
573 | piod.piod_len = len; | |
574 | ||
575 | errno = 0; | |
576 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 577 | { |
9b409511 | 578 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
579 | *xfered_len = piod.piod_len; |
580 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 581 | } |
e8ace1c0 MK |
582 | } |
583 | #endif | |
2ed4b548 | 584 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
585 | |
586 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 587 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
588 | |
589 | default: | |
2ed4b548 | 590 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
591 | } |
592 | } | |
593 | ||
4b8a1a28 | 594 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
595 | |
596 | static int | |
28439f5e | 597 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 598 | { |
4b8a1a28 MK |
599 | /* ??? Is kill the right way to do this? */ |
600 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
601 | } |
602 | ||
603 | /* Print status information about what we're accessing. */ | |
604 | ||
605 | static void | |
606 | inf_ptrace_files_info (struct target_ops *ignore) | |
607 | { | |
181e7f93 PA |
608 | struct inferior *inf = current_inferior (); |
609 | ||
4b8a1a28 | 610 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 611 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 612 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
613 | } |
614 | ||
117de6a9 PA |
615 | static char * |
616 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
617 | { | |
618 | return normal_pid_to_str (ptid); | |
619 | } | |
620 | ||
e8ace1c0 MK |
621 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
622 | ||
623 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
624 | Return 0 if *READPTR is already at the end of the buffer. | |
625 | Return -1 if there is insufficient buffer for a whole entry. | |
626 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
627 | ||
628 | static int | |
629 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
630 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
631 | { | |
f5656ead TT |
632 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
633 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
634 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
635 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 636 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
637 | gdb_byte *ptr = *readptr; |
638 | ||
639 | if (endptr == ptr) | |
640 | return 0; | |
641 | ||
642 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
643 | return -1; | |
644 | ||
645 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
646 | ptr += sizeof_auxv_val; /* Alignment. */ | |
647 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
648 | ptr += sizeof_auxv_val; | |
649 | ||
650 | *readptr = ptr; | |
651 | return 1; | |
652 | } | |
653 | ||
654 | #endif | |
655 | ||
8785ced0 MK |
656 | /* Create a prototype ptrace target. The client can override it with |
657 | local methods. */ | |
658 | ||
5bf970f9 AC |
659 | struct target_ops * |
660 | inf_ptrace_target (void) | |
661 | { | |
662 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 663 | |
5bf970f9 | 664 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
665 | t->to_detach = inf_ptrace_detach; |
666 | t->to_resume = inf_ptrace_resume; | |
667 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 668 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 669 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 670 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
671 | #ifdef PT_GET_PROCESS_STATE |
672 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e85e8e5e MK |
673 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; |
674 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; | |
e4ef629d MK |
675 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
676 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 677 | #endif |
5bf970f9 | 678 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 679 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 680 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
bfedc46a | 681 | t->to_interrupt = inf_ptrace_interrupt; |
c7c14b96 | 682 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
683 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
684 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
685 | #endif | |
8785ced0 MK |
686 | |
687 | return t; | |
688 | } | |
689 | \f | |
690 | ||
4b8a1a28 | 691 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 692 | where a particular register is stored. */ |
7714d83a | 693 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
694 | |
695 | /* Fetch register REGNUM from the inferior. */ | |
696 | ||
697 | static void | |
56be3814 | 698 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 699 | { |
3b3b1423 | 700 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
701 | CORE_ADDR addr; |
702 | size_t size; | |
703 | PTRACE_TYPE_RET *buf; | |
704 | int pid, i; | |
705 | ||
7714d83a | 706 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 707 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 708 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 709 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 710 | { |
56be3814 | 711 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
712 | return; |
713 | } | |
714 | ||
8785ced0 | 715 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 716 | separate processes. */ |
8785ced0 MK |
717 | pid = ptid_get_lwp (inferior_ptid); |
718 | if (pid == 0) | |
719 | pid = ptid_get_pid (inferior_ptid); | |
720 | ||
3b3b1423 | 721 | size = register_size (gdbarch, regnum); |
8785ced0 | 722 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 723 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 724 | |
10d6c8cd | 725 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
726 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
727 | { | |
728 | errno = 0; | |
f7dd0ed7 | 729 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 730 | if (errno != 0) |
4b8a1a28 | 731 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 732 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 733 | regnum, safe_strerror (errno)); |
8785ced0 MK |
734 | |
735 | addr += sizeof (PTRACE_TYPE_RET); | |
736 | } | |
56be3814 | 737 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
738 | } |
739 | ||
740 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
741 | for all registers. */ | |
742 | ||
743 | static void | |
28439f5e PA |
744 | inf_ptrace_fetch_registers (struct target_ops *ops, |
745 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
746 | { |
747 | if (regnum == -1) | |
3b3b1423 UW |
748 | for (regnum = 0; |
749 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
750 | regnum++) | |
56be3814 | 751 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 752 | else |
56be3814 | 753 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
754 | } |
755 | ||
756 | /* Store register REGNUM into the inferior. */ | |
757 | ||
758 | static void | |
56be3814 | 759 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 760 | { |
3b3b1423 | 761 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
762 | CORE_ADDR addr; |
763 | size_t size; | |
764 | PTRACE_TYPE_RET *buf; | |
765 | int pid, i; | |
766 | ||
7714d83a | 767 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 768 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 769 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 770 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
771 | return; |
772 | ||
8785ced0 | 773 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 774 | separate processes. */ |
8785ced0 MK |
775 | pid = ptid_get_lwp (inferior_ptid); |
776 | if (pid == 0) | |
777 | pid = ptid_get_pid (inferior_ptid); | |
778 | ||
3b3b1423 | 779 | size = register_size (gdbarch, regnum); |
8785ced0 | 780 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 781 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 782 | |
10d6c8cd | 783 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 784 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
785 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
786 | { | |
787 | errno = 0; | |
f7dd0ed7 | 788 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 789 | if (errno != 0) |
4b8a1a28 | 790 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 791 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 792 | regnum, safe_strerror (errno)); |
8785ced0 MK |
793 | |
794 | addr += sizeof (PTRACE_TYPE_RET); | |
795 | } | |
796 | } | |
797 | ||
798 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
799 | this for all registers. */ | |
800 | ||
2c0b251b | 801 | static void |
28439f5e PA |
802 | inf_ptrace_store_registers (struct target_ops *ops, |
803 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
804 | { |
805 | if (regnum == -1) | |
3b3b1423 UW |
806 | for (regnum = 0; |
807 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
808 | regnum++) | |
56be3814 | 809 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 810 | else |
56be3814 | 811 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
812 | } |
813 | ||
814 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
815 | a function returning the offset within the user area where a | |
816 | particular register is stored. */ | |
817 | ||
818 | struct target_ops * | |
7714d83a UW |
819 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
820 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
821 | { |
822 | struct target_ops *t = inf_ptrace_target(); | |
823 | ||
824 | gdb_assert (register_u_offset); | |
825 | inf_ptrace_register_u_offset = register_u_offset; | |
826 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
827 | t->to_store_registers = inf_ptrace_store_registers; | |
828 | ||
5bf970f9 AC |
829 | return t; |
830 | } |