Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
32d0add0 | 3 | Copyright (C) 1988-2015 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" |
2c4a536d | 27 | #include "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 | ||
61 | #endif /* PT_GET_PROCESS_STATE */ | |
62 | \f | |
63 | ||
4b8a1a28 | 64 | /* Prepare to be traced. */ |
5bf970f9 AC |
65 | |
66 | static void | |
c7c14b96 | 67 | inf_ptrace_me (void) |
5bf970f9 | 68 | { |
c7c14b96 | 69 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 70 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
71 | } |
72 | ||
136d6dae VP |
73 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
74 | run, ALLARGS is a string containing the arguments to the program. | |
75 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
76 | chatty about it. */ | |
5bf970f9 AC |
77 | |
78 | static void | |
136d6dae VP |
79 | inf_ptrace_create_inferior (struct target_ops *ops, |
80 | char *exec_file, char *allargs, char **env, | |
81 | int from_tty) | |
5bf970f9 | 82 | { |
136d6dae VP |
83 | int pid; |
84 | ||
c0edd9ed JK |
85 | /* Do not change either targets above or the same target if already present. |
86 | The reason is the target stack is shared across multiple inferiors. */ | |
87 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 88 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
89 | |
90 | if (! ops_already_pushed) | |
91 | { | |
92 | /* Clear possible core file with its process_stratum. */ | |
93 | push_target (ops); | |
25f43500 | 94 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
95 | } |
96 | ||
136d6dae | 97 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 98 | NULL, NULL, NULL); |
136d6dae | 99 | |
25f43500 | 100 | discard_cleanups (back_to); |
5bf970f9 | 101 | |
c7c14b96 MK |
102 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
103 | ||
104 | /* On some targets, there must be some explicit actions taken after | |
105 | the inferior has been started up. */ | |
106 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
107 | } |
108 | ||
e4ef629d MK |
109 | #ifdef PT_GET_PROCESS_STATE |
110 | ||
111 | static void | |
2e97a79e | 112 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
113 | { |
114 | ptrace_event_t pe; | |
115 | ||
116 | /* Set the initial event mask. */ | |
117 | memset (&pe, 0, sizeof pe); | |
118 | pe.pe_set_event |= PTRACE_FORK; | |
119 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
120 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
121 | perror_with_name (("ptrace")); | |
122 | } | |
123 | ||
124 | #endif | |
125 | ||
4b8a1a28 MK |
126 | /* Clean up a rotting corpse of an inferior after it died. */ |
127 | ||
c7c14b96 | 128 | static void |
136d6dae | 129 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 130 | { |
4b8a1a28 MK |
131 | int status; |
132 | ||
133 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 134 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 135 | dealing with a process that we attached to. Such a process will |
3d450bdd | 136 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
137 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
138 | ||
c1ee2fb3 | 139 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
140 | } |
141 | ||
4b8a1a28 MK |
142 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
143 | be chatty about it. */ | |
5bf970f9 AC |
144 | |
145 | static void | |
c0939df1 | 146 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
147 | { |
148 | char *exec_file; | |
4b8a1a28 | 149 | pid_t pid; |
181e7f93 | 150 | struct inferior *inf; |
5bf970f9 | 151 | |
c0edd9ed JK |
152 | /* Do not change either targets above or the same target if already present. |
153 | The reason is the target stack is shared across multiple inferiors. */ | |
154 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 155 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 156 | |
74164c56 | 157 | pid = parse_pid_to_attach (args); |
5bf970f9 | 158 | |
f6ffd89b | 159 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 160 | error (_("I refuse to debug myself!")); |
5bf970f9 | 161 | |
c0edd9ed JK |
162 | if (! ops_already_pushed) |
163 | { | |
164 | /* target_pid_to_str already uses the target. Also clear possible core | |
165 | file with its process_stratum. */ | |
166 | push_target (ops); | |
25f43500 | 167 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
168 | } |
169 | ||
5bf970f9 AC |
170 | if (from_tty) |
171 | { | |
4b8a1a28 | 172 | exec_file = get_exec_file (0); |
5bf970f9 AC |
173 | |
174 | if (exec_file) | |
a3f17187 | 175 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
176 | target_pid_to_str (pid_to_ptid (pid))); |
177 | else | |
a3f17187 | 178 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
179 | target_pid_to_str (pid_to_ptid (pid))); |
180 | ||
181 | gdb_flush (gdb_stdout); | |
182 | } | |
183 | ||
6e1e94ea MK |
184 | #ifdef PT_ATTACH |
185 | errno = 0; | |
4b8a1a28 | 186 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 187 | if (errno != 0) |
e2e0b3e5 | 188 | perror_with_name (("ptrace")); |
6e1e94ea | 189 | #else |
8a3fe4f8 | 190 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 191 | #endif |
5bf970f9 | 192 | |
6c95b8df PA |
193 | inf = current_inferior (); |
194 | inferior_appeared (inf, pid); | |
181e7f93 | 195 | inf->attach_flag = 1; |
6c95b8df | 196 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 197 | |
af990527 PA |
198 | /* Always add a main thread. If some target extends the ptrace |
199 | target, it should decorate the ptid later with more info. */ | |
200 | add_thread_silent (inferior_ptid); | |
201 | ||
25f43500 | 202 | discard_cleanups (back_to); |
5bf970f9 AC |
203 | } |
204 | ||
e4ef629d MK |
205 | #ifdef PT_GET_PROCESS_STATE |
206 | ||
460fac3c | 207 | static void |
f045800c | 208 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
209 | { |
210 | ptrace_event_t pe; | |
211 | ||
212 | /* Set the initial event mask. */ | |
213 | memset (&pe, 0, sizeof pe); | |
214 | pe.pe_set_event |= PTRACE_FORK; | |
215 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
216 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
217 | perror_with_name (("ptrace")); | |
218 | } | |
219 | ||
220 | #endif | |
221 | ||
4b8a1a28 | 222 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 223 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
224 | |
225 | static void | |
52554a0e | 226 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 227 | { |
4b8a1a28 | 228 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 229 | int sig = 0; |
5bf970f9 AC |
230 | |
231 | if (from_tty) | |
232 | { | |
233 | char *exec_file = get_exec_file (0); | |
234 | if (exec_file == 0) | |
235 | exec_file = ""; | |
a3f17187 | 236 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
237 | target_pid_to_str (pid_to_ptid (pid))); |
238 | gdb_flush (gdb_stdout); | |
239 | } | |
240 | if (args) | |
6e1e94ea | 241 | sig = atoi (args); |
5bf970f9 | 242 | |
6e1e94ea | 243 | #ifdef PT_DETACH |
4b8a1a28 | 244 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 245 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
246 | previously attached to the inferior. It *might* work if we |
247 | started the process ourselves. */ | |
6e1e94ea | 248 | errno = 0; |
4b8a1a28 | 249 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 250 | if (errno != 0) |
e2e0b3e5 | 251 | perror_with_name (("ptrace")); |
6e1e94ea | 252 | #else |
8a3fe4f8 | 253 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 254 | #endif |
5bf970f9 AC |
255 | |
256 | inferior_ptid = null_ptid; | |
7f9f62ba | 257 | detach_inferior (pid); |
7a7d3353 | 258 | |
6a3cb8e8 | 259 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
260 | } |
261 | ||
4b8a1a28 MK |
262 | /* Kill the inferior. */ |
263 | ||
5bf970f9 | 264 | static void |
7d85a9c0 | 265 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 266 | { |
4b8a1a28 | 267 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 268 | int status; |
c7c14b96 MK |
269 | |
270 | if (pid == 0) | |
271 | return; | |
272 | ||
4b8a1a28 MK |
273 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
274 | waitpid (pid, &status, 0); | |
275 | ||
c7c14b96 | 276 | target_mourn_inferior (); |
5bf970f9 AC |
277 | } |
278 | ||
4b8a1a28 | 279 | /* Stop the inferior. */ |
c7c14b96 | 280 | |
5bf970f9 | 281 | static void |
1eab8a48 | 282 | inf_ptrace_stop (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 283 | { |
4b8a1a28 MK |
284 | /* Send a SIGINT to the process group. This acts just like the user |
285 | typed a ^C on the controlling terminal. Note that using a | |
286 | negative process number in kill() is a System V-ism. The proper | |
287 | BSD interface is killpg(). However, all modern BSDs support the | |
288 | System V interface too. */ | |
7e1789f5 | 289 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
290 | } |
291 | ||
90ad5e1d PA |
292 | /* Return which PID to pass to ptrace in order to observe/control the |
293 | tracee identified by PTID. */ | |
294 | ||
295 | static pid_t | |
296 | get_ptrace_pid (ptid_t ptid) | |
297 | { | |
298 | pid_t pid; | |
299 | ||
300 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
301 | dealing with a non-threaded program/target. */ | |
302 | pid = ptid_get_lwp (ptid); | |
303 | if (pid == 0) | |
304 | pid = ptid_get_pid (ptid); | |
305 | return pid; | |
306 | } | |
307 | ||
4b8a1a28 MK |
308 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
309 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
310 | that signal. */ | |
5bf970f9 AC |
311 | |
312 | static void | |
28439f5e | 313 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 314 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 315 | { |
90ad5e1d | 316 | pid_t pid; |
a96d9b2e | 317 | int request; |
c7c14b96 | 318 | |
90ad5e1d | 319 | if (ptid_equal (minus_one_ptid, ptid)) |
4b8a1a28 MK |
320 | /* Resume all threads. Traditionally ptrace() only supports |
321 | single-threaded processes, so simply resume the inferior. */ | |
c1593e4f | 322 | pid = ptid_get_pid (inferior_ptid); |
90ad5e1d PA |
323 | else |
324 | pid = get_ptrace_pid (ptid); | |
c7c14b96 | 325 | |
a96d9b2e SDJ |
326 | if (catch_syscall_enabled () > 0) |
327 | request = PT_SYSCALL; | |
328 | else | |
329 | request = PT_CONTINUE; | |
330 | ||
c7c14b96 MK |
331 | if (step) |
332 | { | |
333 | /* If this system does not support PT_STEP, a higher level | |
334 | function will have called single_step() to transmute the step | |
335 | request into a continue request (by setting breakpoints on | |
336 | all possible successor instructions), so we don't have to | |
337 | worry about that here. */ | |
338 | request = PT_STEP; | |
339 | } | |
340 | ||
341 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
342 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 343 | already written a new program counter value to the child. */ |
c7c14b96 | 344 | errno = 0; |
2ea28649 | 345 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
346 | if (errno != 0) |
347 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
348 | } |
349 | ||
4b8a1a28 MK |
350 | /* Wait for the child specified by PTID to do something. Return the |
351 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
352 | the status in *OURSTATUS. */ | |
5bf970f9 | 353 | |
c7c14b96 | 354 | static ptid_t |
117de6a9 | 355 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 356 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 357 | { |
4b8a1a28 MK |
358 | pid_t pid; |
359 | int status, save_errno; | |
5bf970f9 | 360 | |
c7c14b96 MK |
361 | do |
362 | { | |
4b8a1a28 | 363 | set_sigint_trap (); |
5bf970f9 | 364 | |
4b8a1a28 MK |
365 | do |
366 | { | |
367 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
368 | save_errno = errno; | |
369 | } | |
370 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 371 | |
c7c14b96 | 372 | clear_sigint_trap (); |
5bf970f9 | 373 | |
c7c14b96 MK |
374 | if (pid == -1) |
375 | { | |
c7c14b96 | 376 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 377 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
378 | safe_strerror (save_errno)); |
379 | ||
380 | /* Claim it exited with unknown signal. */ | |
381 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 382 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 383 | return inferior_ptid; |
c7c14b96 MK |
384 | } |
385 | ||
4b8a1a28 MK |
386 | /* Ignore terminated detached child processes. */ |
387 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
388 | pid = -1; | |
c7c14b96 | 389 | } |
4b8a1a28 | 390 | while (pid == -1); |
c7c14b96 | 391 | |
735f54b4 MK |
392 | #ifdef PT_GET_PROCESS_STATE |
393 | if (WIFSTOPPED (status)) | |
394 | { | |
395 | ptrace_state_t pe; | |
396 | pid_t fpid; | |
397 | ||
398 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
399 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
400 | perror_with_name (("ptrace")); | |
401 | ||
402 | switch (pe.pe_report_event) | |
403 | { | |
404 | case PTRACE_FORK: | |
405 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 406 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
407 | |
408 | /* Make sure the other end of the fork is stopped too. */ | |
409 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
410 | if (fpid == -1) | |
411 | perror_with_name (("waitpid")); | |
412 | ||
413 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
414 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
415 | perror_with_name (("ptrace")); | |
416 | ||
417 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
418 | gdb_assert (pe.pe_other_pid == pid); | |
419 | if (fpid == ptid_get_pid (inferior_ptid)) | |
420 | { | |
3a3e9ee3 | 421 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
422 | return pid_to_ptid (fpid); |
423 | } | |
424 | ||
425 | return pid_to_ptid (pid); | |
426 | } | |
427 | } | |
428 | #endif | |
429 | ||
c7c14b96 MK |
430 | store_waitstatus (ourstatus, status); |
431 | return pid_to_ptid (pid); | |
5bf970f9 AC |
432 | } |
433 | ||
edcc890f | 434 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 435 | |
9b409511 | 436 | static enum target_xfer_status |
5bf970f9 | 437 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
438 | const char *annex, gdb_byte *readbuf, |
439 | const gdb_byte *writebuf, | |
9b409511 | 440 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 441 | { |
4b8a1a28 MK |
442 | pid_t pid = ptid_get_pid (inferior_ptid); |
443 | ||
5bf970f9 AC |
444 | switch (object) |
445 | { | |
446 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
447 | #ifdef PT_IO |
448 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
449 | request that promises to be much more efficient in reading | |
450 | and writing data in the traced process's address space. */ | |
451 | { | |
452 | struct ptrace_io_desc piod; | |
4b8a1a28 | 453 | |
f929a579 | 454 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
455 | for instruction and data. However, on OpenBSD 3.9 and |
456 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
457 | mapped read-only. Since most code segments will be | |
458 | read-only, using PIOD_WRITE_D will prevent us from | |
459 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
460 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
461 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
462 | piod.piod_offs = (void *) (long) offset; | |
463 | piod.piod_len = len; | |
464 | ||
465 | errno = 0; | |
4b8a1a28 | 466 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 467 | { |
9b409511 | 468 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
469 | *xfered_len = piod.piod_len; |
470 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 471 | } |
f929a579 AC |
472 | /* If the PT_IO request is somehow not supported, fallback on |
473 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
474 | to indicate failure. */ | |
475 | if (errno != EINVAL) | |
9b409511 | 476 | return TARGET_XFER_EOF; |
f929a579 AC |
477 | } |
478 | #endif | |
479 | { | |
480 | union | |
481 | { | |
482 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 483 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
484 | } buffer; |
485 | ULONGEST rounded_offset; | |
9b409511 | 486 | ULONGEST partial_len; |
4b8a1a28 | 487 | |
cb85a953 AC |
488 | /* Round the start offset down to the next long word |
489 | boundary. */ | |
f929a579 | 490 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 491 | |
cb85a953 AC |
492 | /* Since ptrace will transfer a single word starting at that |
493 | rounded_offset the partial_len needs to be adjusted down to | |
494 | that (remember this function only does a single transfer). | |
495 | Should the required length be even less, adjust it down | |
496 | again. */ | |
497 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
498 | if (partial_len > len) | |
f929a579 | 499 | partial_len = len; |
4b8a1a28 | 500 | |
f929a579 AC |
501 | if (writebuf) |
502 | { | |
cb85a953 AC |
503 | /* If OFFSET:PARTIAL_LEN is smaller than |
504 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
505 | be needed. Read in the entire word. */ | |
f929a579 | 506 | if (rounded_offset < offset |
cb85a953 AC |
507 | || (offset + partial_len |
508 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 509 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 510 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
511 | (PTRACE_TYPE_ARG3)(uintptr_t) |
512 | rounded_offset, 0); | |
4b8a1a28 | 513 | |
f929a579 AC |
514 | /* Copy data to be written over corresponding part of |
515 | buffer. */ | |
f6ffd89b MK |
516 | memcpy (buffer.byte + (offset - rounded_offset), |
517 | writebuf, partial_len); | |
4b8a1a28 | 518 | |
f929a579 | 519 | errno = 0; |
4b8a1a28 | 520 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
521 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
522 | buffer.word); | |
f929a579 AC |
523 | if (errno) |
524 | { | |
525 | /* Using the appropriate one (I or D) is necessary for | |
526 | Gould NP1, at least. */ | |
527 | errno = 0; | |
4b8a1a28 | 528 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
529 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
530 | buffer.word); | |
f929a579 | 531 | if (errno) |
9b409511 | 532 | return TARGET_XFER_EOF; |
f929a579 AC |
533 | } |
534 | } | |
4b8a1a28 | 535 | |
f929a579 AC |
536 | if (readbuf) |
537 | { | |
538 | errno = 0; | |
4b8a1a28 | 539 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
540 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
541 | 0); | |
f929a579 | 542 | if (errno) |
9b409511 | 543 | return TARGET_XFER_EOF; |
f929a579 AC |
544 | /* Copy appropriate bytes out of the buffer. */ |
545 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
546 | partial_len); | |
547 | } | |
4b8a1a28 | 548 | |
9b409511 YQ |
549 | *xfered_len = partial_len; |
550 | return TARGET_XFER_OK; | |
f929a579 | 551 | } |
5bf970f9 AC |
552 | |
553 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 554 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
555 | |
556 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
557 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
558 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
559 | request that allows us to read the auxilliary vector. Other | |
560 | BSD's may follow if they feel the need to support PIE. */ | |
561 | { | |
562 | struct ptrace_io_desc piod; | |
563 | ||
564 | if (writebuf) | |
2ed4b548 | 565 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
566 | piod.piod_op = PIOD_READ_AUXV; |
567 | piod.piod_addr = readbuf; | |
568 | piod.piod_offs = (void *) (long) offset; | |
569 | piod.piod_len = len; | |
570 | ||
571 | errno = 0; | |
572 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 573 | { |
9b409511 | 574 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
575 | *xfered_len = piod.piod_len; |
576 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 577 | } |
e8ace1c0 MK |
578 | } |
579 | #endif | |
2ed4b548 | 580 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
581 | |
582 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 583 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
584 | |
585 | default: | |
2ed4b548 | 586 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
587 | } |
588 | } | |
589 | ||
4b8a1a28 | 590 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
591 | |
592 | static int | |
28439f5e | 593 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 594 | { |
4b8a1a28 MK |
595 | /* ??? Is kill the right way to do this? */ |
596 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
597 | } |
598 | ||
599 | /* Print status information about what we're accessing. */ | |
600 | ||
601 | static void | |
602 | inf_ptrace_files_info (struct target_ops *ignore) | |
603 | { | |
181e7f93 PA |
604 | struct inferior *inf = current_inferior (); |
605 | ||
4b8a1a28 | 606 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 607 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 608 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
609 | } |
610 | ||
117de6a9 PA |
611 | static char * |
612 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
613 | { | |
614 | return normal_pid_to_str (ptid); | |
615 | } | |
616 | ||
e8ace1c0 MK |
617 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
618 | ||
619 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
620 | Return 0 if *READPTR is already at the end of the buffer. | |
621 | Return -1 if there is insufficient buffer for a whole entry. | |
622 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
623 | ||
624 | static int | |
625 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
626 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
627 | { | |
f5656ead TT |
628 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
629 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
630 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
631 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 632 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
633 | gdb_byte *ptr = *readptr; |
634 | ||
635 | if (endptr == ptr) | |
636 | return 0; | |
637 | ||
638 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
639 | return -1; | |
640 | ||
641 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
642 | ptr += sizeof_auxv_val; /* Alignment. */ | |
643 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
644 | ptr += sizeof_auxv_val; | |
645 | ||
646 | *readptr = ptr; | |
647 | return 1; | |
648 | } | |
649 | ||
650 | #endif | |
651 | ||
8785ced0 MK |
652 | /* Create a prototype ptrace target. The client can override it with |
653 | local methods. */ | |
654 | ||
5bf970f9 AC |
655 | struct target_ops * |
656 | inf_ptrace_target (void) | |
657 | { | |
658 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 659 | |
5bf970f9 | 660 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
661 | t->to_detach = inf_ptrace_detach; |
662 | t->to_resume = inf_ptrace_resume; | |
663 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 664 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 665 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 666 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
667 | #ifdef PT_GET_PROCESS_STATE |
668 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
669 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
670 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 671 | #endif |
5bf970f9 | 672 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 673 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 674 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 675 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 676 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
677 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
678 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
679 | #endif | |
8785ced0 MK |
680 | |
681 | return t; | |
682 | } | |
683 | \f | |
684 | ||
4b8a1a28 | 685 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 686 | where a particular register is stored. */ |
7714d83a | 687 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
688 | |
689 | /* Fetch register REGNUM from the inferior. */ | |
690 | ||
691 | static void | |
56be3814 | 692 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 693 | { |
3b3b1423 | 694 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
695 | CORE_ADDR addr; |
696 | size_t size; | |
697 | PTRACE_TYPE_RET *buf; | |
698 | int pid, i; | |
699 | ||
7714d83a | 700 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 701 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 702 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 703 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 704 | { |
56be3814 | 705 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
706 | return; |
707 | } | |
708 | ||
8785ced0 | 709 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 710 | separate processes. */ |
8785ced0 MK |
711 | pid = ptid_get_lwp (inferior_ptid); |
712 | if (pid == 0) | |
713 | pid = ptid_get_pid (inferior_ptid); | |
714 | ||
3b3b1423 | 715 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
716 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
717 | buf = alloca (size); | |
718 | ||
10d6c8cd | 719 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
720 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
721 | { | |
722 | errno = 0; | |
f7dd0ed7 | 723 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 724 | if (errno != 0) |
4b8a1a28 | 725 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 726 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 727 | regnum, safe_strerror (errno)); |
8785ced0 MK |
728 | |
729 | addr += sizeof (PTRACE_TYPE_RET); | |
730 | } | |
56be3814 | 731 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
732 | } |
733 | ||
734 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
735 | for all registers. */ | |
736 | ||
737 | static void | |
28439f5e PA |
738 | inf_ptrace_fetch_registers (struct target_ops *ops, |
739 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
740 | { |
741 | if (regnum == -1) | |
3b3b1423 UW |
742 | for (regnum = 0; |
743 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
744 | regnum++) | |
56be3814 | 745 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 746 | else |
56be3814 | 747 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
748 | } |
749 | ||
750 | /* Store register REGNUM into the inferior. */ | |
751 | ||
752 | static void | |
56be3814 | 753 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 754 | { |
3b3b1423 | 755 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
756 | CORE_ADDR addr; |
757 | size_t size; | |
758 | PTRACE_TYPE_RET *buf; | |
759 | int pid, i; | |
760 | ||
7714d83a | 761 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 762 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 763 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 764 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
765 | return; |
766 | ||
8785ced0 | 767 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 768 | separate processes. */ |
8785ced0 MK |
769 | pid = ptid_get_lwp (inferior_ptid); |
770 | if (pid == 0) | |
771 | pid = ptid_get_pid (inferior_ptid); | |
772 | ||
3b3b1423 | 773 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
774 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
775 | buf = alloca (size); | |
776 | ||
10d6c8cd | 777 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 778 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
779 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
780 | { | |
781 | errno = 0; | |
f7dd0ed7 | 782 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 783 | if (errno != 0) |
4b8a1a28 | 784 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 785 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 786 | regnum, safe_strerror (errno)); |
8785ced0 MK |
787 | |
788 | addr += sizeof (PTRACE_TYPE_RET); | |
789 | } | |
790 | } | |
791 | ||
792 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
793 | this for all registers. */ | |
794 | ||
2c0b251b | 795 | static void |
28439f5e PA |
796 | inf_ptrace_store_registers (struct target_ops *ops, |
797 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
798 | { |
799 | if (regnum == -1) | |
3b3b1423 UW |
800 | for (regnum = 0; |
801 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
802 | regnum++) | |
56be3814 | 803 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 804 | else |
56be3814 | 805 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
806 | } |
807 | ||
808 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
809 | a function returning the offset within the user area where a | |
810 | particular register is stored. */ | |
811 | ||
812 | struct target_ops * | |
7714d83a UW |
813 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
814 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
815 | { |
816 | struct target_ops *t = inf_ptrace_target(); | |
817 | ||
818 | gdb_assert (register_u_offset); | |
819 | inf_ptrace_register_u_offset = register_u_offset; | |
820 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
821 | t->to_store_registers = inf_ptrace_store_registers; | |
822 | ||
5bf970f9 AC |
823 | return t; |
824 | } |