Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
e2882c85 | 3 | Copyright (C) 1988-2018 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" |
2090129c SDJ |
34 | #include "nat/fork-inferior.h" |
35 | #include "utils.h" | |
2c4a536d | 36 | |
c7c14b96 MK |
37 | \f |
38 | ||
735f54b4 MK |
39 | #ifdef PT_GET_PROCESS_STATE |
40 | ||
d83ad864 DB |
41 | /* Target hook for follow_fork. On entry and at return inferior_ptid is |
42 | the ptid of the followed inferior. */ | |
43 | ||
735f54b4 | 44 | static int |
07107ca6 LM |
45 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child, |
46 | int detach_fork) | |
735f54b4 | 47 | { |
d83ad864 | 48 | if (!follow_child) |
735f54b4 | 49 | { |
ebf3aa72 MK |
50 | struct thread_info *tp = inferior_thread (); |
51 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
191c4426 | 52 | |
b242c3c2 PA |
53 | /* Breakpoints have already been detached from the child by |
54 | infrun.c. */ | |
735f54b4 | 55 | |
d83ad864 | 56 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) |
735f54b4 MK |
57 | perror_with_name (("ptrace")); |
58 | } | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
e85e8e5e MK |
63 | static int |
64 | inf_ptrace_insert_fork_catchpoint (struct target_ops *self, int pid) | |
65 | { | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int | |
70 | inf_ptrace_remove_fork_catchpoint (struct target_ops *self, int pid) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | ||
735f54b4 MK |
75 | #endif /* PT_GET_PROCESS_STATE */ |
76 | \f | |
77 | ||
4b8a1a28 | 78 | /* Prepare to be traced. */ |
5bf970f9 AC |
79 | |
80 | static void | |
c7c14b96 | 81 | inf_ptrace_me (void) |
5bf970f9 | 82 | { |
c7c14b96 | 83 | /* "Trace me, Dr. Memory!" */ |
0db8980c SDJ |
84 | if (ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3) 0, 0) < 0) |
85 | trace_start_error_with_name ("ptrace"); | |
5bf970f9 AC |
86 | } |
87 | ||
136d6dae VP |
88 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
89 | run, ALLARGS is a string containing the arguments to the program. | |
90 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
91 | chatty about it. */ | |
5bf970f9 AC |
92 | |
93 | static void | |
136d6dae | 94 | inf_ptrace_create_inferior (struct target_ops *ops, |
7c5ded6a SDJ |
95 | const char *exec_file, const std::string &allargs, |
96 | char **env, int from_tty) | |
5bf970f9 | 97 | { |
2090129c SDJ |
98 | pid_t pid; |
99 | ptid_t ptid; | |
136d6dae | 100 | |
c0edd9ed JK |
101 | /* Do not change either targets above or the same target if already present. |
102 | The reason is the target stack is shared across multiple inferiors. */ | |
103 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 104 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
105 | |
106 | if (! ops_already_pushed) | |
107 | { | |
108 | /* Clear possible core file with its process_stratum. */ | |
109 | push_target (ops); | |
25f43500 | 110 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
111 | } |
112 | ||
136d6dae | 113 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 114 | NULL, NULL, NULL); |
136d6dae | 115 | |
2090129c SDJ |
116 | ptid = pid_to_ptid (pid); |
117 | /* We have something that executes now. We'll be running through | |
118 | the shell at this point (if startup-with-shell is true), but the | |
119 | pid shouldn't change. */ | |
120 | add_thread_silent (ptid); | |
121 | ||
25f43500 | 122 | discard_cleanups (back_to); |
5bf970f9 | 123 | |
2090129c | 124 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); |
c7c14b96 MK |
125 | |
126 | /* On some targets, there must be some explicit actions taken after | |
127 | the inferior has been started up. */ | |
2090129c | 128 | target_post_startup_inferior (ptid); |
5bf970f9 AC |
129 | } |
130 | ||
e4ef629d MK |
131 | #ifdef PT_GET_PROCESS_STATE |
132 | ||
133 | static void | |
2e97a79e | 134 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
135 | { |
136 | ptrace_event_t pe; | |
137 | ||
138 | /* Set the initial event mask. */ | |
139 | memset (&pe, 0, sizeof pe); | |
140 | pe.pe_set_event |= PTRACE_FORK; | |
141 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
142 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
143 | perror_with_name (("ptrace")); | |
144 | } | |
145 | ||
146 | #endif | |
147 | ||
4b8a1a28 MK |
148 | /* Clean up a rotting corpse of an inferior after it died. */ |
149 | ||
c7c14b96 | 150 | static void |
136d6dae | 151 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 152 | { |
4b8a1a28 MK |
153 | int status; |
154 | ||
155 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 156 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 157 | dealing with a process that we attached to. Such a process will |
3d450bdd | 158 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
159 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
160 | ||
c1ee2fb3 | 161 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
162 | } |
163 | ||
4b8a1a28 MK |
164 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
165 | be chatty about it. */ | |
5bf970f9 AC |
166 | |
167 | static void | |
c0939df1 | 168 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
169 | { |
170 | char *exec_file; | |
4b8a1a28 | 171 | pid_t pid; |
181e7f93 | 172 | struct inferior *inf; |
5bf970f9 | 173 | |
c0edd9ed JK |
174 | /* Do not change either targets above or the same target if already present. |
175 | The reason is the target stack is shared across multiple inferiors. */ | |
176 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 177 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 178 | |
74164c56 | 179 | pid = parse_pid_to_attach (args); |
5bf970f9 | 180 | |
f6ffd89b | 181 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 182 | error (_("I refuse to debug myself!")); |
5bf970f9 | 183 | |
c0edd9ed JK |
184 | if (! ops_already_pushed) |
185 | { | |
186 | /* target_pid_to_str already uses the target. Also clear possible core | |
187 | file with its process_stratum. */ | |
188 | push_target (ops); | |
25f43500 | 189 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
190 | } |
191 | ||
5bf970f9 AC |
192 | if (from_tty) |
193 | { | |
4b8a1a28 | 194 | exec_file = get_exec_file (0); |
5bf970f9 AC |
195 | |
196 | if (exec_file) | |
a3f17187 | 197 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
198 | target_pid_to_str (pid_to_ptid (pid))); |
199 | else | |
a3f17187 | 200 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
201 | target_pid_to_str (pid_to_ptid (pid))); |
202 | ||
203 | gdb_flush (gdb_stdout); | |
204 | } | |
205 | ||
6e1e94ea MK |
206 | #ifdef PT_ATTACH |
207 | errno = 0; | |
4b8a1a28 | 208 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 209 | if (errno != 0) |
e2e0b3e5 | 210 | perror_with_name (("ptrace")); |
6e1e94ea | 211 | #else |
8a3fe4f8 | 212 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 213 | #endif |
5bf970f9 | 214 | |
6c95b8df PA |
215 | inf = current_inferior (); |
216 | inferior_appeared (inf, pid); | |
181e7f93 | 217 | inf->attach_flag = 1; |
6c95b8df | 218 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 219 | |
af990527 PA |
220 | /* Always add a main thread. If some target extends the ptrace |
221 | target, it should decorate the ptid later with more info. */ | |
222 | add_thread_silent (inferior_ptid); | |
223 | ||
25f43500 | 224 | discard_cleanups (back_to); |
5bf970f9 AC |
225 | } |
226 | ||
e4ef629d MK |
227 | #ifdef PT_GET_PROCESS_STATE |
228 | ||
460fac3c | 229 | static void |
f045800c | 230 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
231 | { |
232 | ptrace_event_t pe; | |
233 | ||
234 | /* Set the initial event mask. */ | |
235 | memset (&pe, 0, sizeof pe); | |
236 | pe.pe_set_event |= PTRACE_FORK; | |
237 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
238 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
239 | perror_with_name (("ptrace")); | |
240 | } | |
241 | ||
242 | #endif | |
243 | ||
6bd6f3b6 | 244 | /* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
245 | |
246 | static void | |
6e1e1966 | 247 | inf_ptrace_detach (struct target_ops *ops, inferior *inf, int from_tty) |
5bf970f9 | 248 | { |
4b8a1a28 | 249 | pid_t pid = ptid_get_pid (inferior_ptid); |
5bf970f9 | 250 | |
0f48b757 | 251 | target_announce_detach (from_tty); |
5bf970f9 | 252 | |
6e1e94ea | 253 | #ifdef PT_DETACH |
4b8a1a28 | 254 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 255 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
256 | previously attached to the inferior. It *might* work if we |
257 | started the process ourselves. */ | |
6e1e94ea | 258 | errno = 0; |
6bd6f3b6 | 259 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0); |
6e1e94ea | 260 | if (errno != 0) |
e2e0b3e5 | 261 | perror_with_name (("ptrace")); |
6e1e94ea | 262 | #else |
8a3fe4f8 | 263 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 264 | #endif |
5bf970f9 | 265 | |
ced2dffb PA |
266 | inf_ptrace_detach_success (ops); |
267 | } | |
268 | ||
269 | /* See inf-ptrace.h. */ | |
270 | ||
271 | void | |
272 | inf_ptrace_detach_success (struct target_ops *ops) | |
273 | { | |
274 | pid_t pid = ptid_get_pid (inferior_ptid); | |
275 | ||
5bf970f9 | 276 | inferior_ptid = null_ptid; |
7f9f62ba | 277 | detach_inferior (pid); |
7a7d3353 | 278 | |
6a3cb8e8 | 279 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
280 | } |
281 | ||
4b8a1a28 MK |
282 | /* Kill the inferior. */ |
283 | ||
5bf970f9 | 284 | static void |
7d85a9c0 | 285 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 286 | { |
4b8a1a28 | 287 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 288 | int status; |
c7c14b96 MK |
289 | |
290 | if (pid == 0) | |
291 | return; | |
292 | ||
4b8a1a28 MK |
293 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
294 | waitpid (pid, &status, 0); | |
295 | ||
bc1e6c81 | 296 | target_mourn_inferior (inferior_ptid); |
5bf970f9 AC |
297 | } |
298 | ||
bfedc46a | 299 | /* Interrupt the inferior. */ |
c7c14b96 | 300 | |
5bf970f9 | 301 | static void |
bfedc46a | 302 | inf_ptrace_interrupt (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 303 | { |
4b8a1a28 MK |
304 | /* Send a SIGINT to the process group. This acts just like the user |
305 | typed a ^C on the controlling terminal. Note that using a | |
306 | negative process number in kill() is a System V-ism. The proper | |
307 | BSD interface is killpg(). However, all modern BSDs support the | |
308 | System V interface too. */ | |
7e1789f5 | 309 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
310 | } |
311 | ||
90ad5e1d PA |
312 | /* Return which PID to pass to ptrace in order to observe/control the |
313 | tracee identified by PTID. */ | |
314 | ||
94309df7 | 315 | pid_t |
90ad5e1d PA |
316 | get_ptrace_pid (ptid_t ptid) |
317 | { | |
318 | pid_t pid; | |
319 | ||
320 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
321 | dealing with a non-threaded program/target. */ | |
322 | pid = ptid_get_lwp (ptid); | |
323 | if (pid == 0) | |
324 | pid = ptid_get_pid (ptid); | |
325 | return pid; | |
326 | } | |
327 | ||
4b8a1a28 MK |
328 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
329 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
330 | that signal. */ | |
5bf970f9 AC |
331 | |
332 | static void | |
28439f5e | 333 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 334 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 335 | { |
90ad5e1d | 336 | pid_t pid; |
a96d9b2e | 337 | int request; |
c7c14b96 | 338 | |
90ad5e1d | 339 | if (ptid_equal (minus_one_ptid, ptid)) |
4b8a1a28 MK |
340 | /* Resume all threads. Traditionally ptrace() only supports |
341 | single-threaded processes, so simply resume the inferior. */ | |
c1593e4f | 342 | pid = ptid_get_pid (inferior_ptid); |
90ad5e1d PA |
343 | else |
344 | pid = get_ptrace_pid (ptid); | |
c7c14b96 | 345 | |
a96d9b2e SDJ |
346 | if (catch_syscall_enabled () > 0) |
347 | request = PT_SYSCALL; | |
348 | else | |
349 | request = PT_CONTINUE; | |
350 | ||
c7c14b96 MK |
351 | if (step) |
352 | { | |
353 | /* If this system does not support PT_STEP, a higher level | |
354 | function will have called single_step() to transmute the step | |
355 | request into a continue request (by setting breakpoints on | |
356 | all possible successor instructions), so we don't have to | |
357 | worry about that here. */ | |
358 | request = PT_STEP; | |
359 | } | |
360 | ||
361 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
362 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 363 | already written a new program counter value to the child. */ |
c7c14b96 | 364 | errno = 0; |
2ea28649 | 365 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
366 | if (errno != 0) |
367 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
368 | } |
369 | ||
4b8a1a28 MK |
370 | /* Wait for the child specified by PTID to do something. Return the |
371 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
372 | the status in *OURSTATUS. */ | |
5bf970f9 | 373 | |
c7c14b96 | 374 | static ptid_t |
117de6a9 | 375 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 376 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 377 | { |
4b8a1a28 MK |
378 | pid_t pid; |
379 | int status, save_errno; | |
5bf970f9 | 380 | |
c7c14b96 MK |
381 | do |
382 | { | |
4b8a1a28 | 383 | set_sigint_trap (); |
5bf970f9 | 384 | |
4b8a1a28 MK |
385 | do |
386 | { | |
387 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
388 | save_errno = errno; | |
389 | } | |
390 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 391 | |
c7c14b96 | 392 | clear_sigint_trap (); |
5bf970f9 | 393 | |
c7c14b96 MK |
394 | if (pid == -1) |
395 | { | |
c7c14b96 | 396 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 397 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
398 | safe_strerror (save_errno)); |
399 | ||
400 | /* Claim it exited with unknown signal. */ | |
401 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 402 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 403 | return inferior_ptid; |
c7c14b96 MK |
404 | } |
405 | ||
4b8a1a28 MK |
406 | /* Ignore terminated detached child processes. */ |
407 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
408 | pid = -1; | |
c7c14b96 | 409 | } |
4b8a1a28 | 410 | while (pid == -1); |
c7c14b96 | 411 | |
735f54b4 MK |
412 | #ifdef PT_GET_PROCESS_STATE |
413 | if (WIFSTOPPED (status)) | |
414 | { | |
415 | ptrace_state_t pe; | |
416 | pid_t fpid; | |
417 | ||
418 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
419 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
420 | perror_with_name (("ptrace")); | |
421 | ||
422 | switch (pe.pe_report_event) | |
423 | { | |
424 | case PTRACE_FORK: | |
425 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 426 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
427 | |
428 | /* Make sure the other end of the fork is stopped too. */ | |
429 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
430 | if (fpid == -1) | |
431 | perror_with_name (("waitpid")); | |
432 | ||
433 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
434 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
435 | perror_with_name (("ptrace")); | |
436 | ||
437 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
438 | gdb_assert (pe.pe_other_pid == pid); | |
439 | if (fpid == ptid_get_pid (inferior_ptid)) | |
440 | { | |
3a3e9ee3 | 441 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
442 | return pid_to_ptid (fpid); |
443 | } | |
444 | ||
445 | return pid_to_ptid (pid); | |
446 | } | |
447 | } | |
448 | #endif | |
449 | ||
c7c14b96 MK |
450 | store_waitstatus (ourstatus, status); |
451 | return pid_to_ptid (pid); | |
5bf970f9 AC |
452 | } |
453 | ||
87c336f6 AA |
454 | /* Transfer data via ptrace into process PID's memory from WRITEBUF, or |
455 | from process PID's memory into READBUF. Start at target address ADDR | |
456 | and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must | |
457 | be non-null. Return the number of transferred bytes. */ | |
458 | ||
459 | static ULONGEST | |
460 | inf_ptrace_peek_poke (pid_t pid, gdb_byte *readbuf, | |
461 | const gdb_byte *writebuf, | |
462 | ULONGEST addr, ULONGEST len) | |
463 | { | |
464 | ULONGEST n; | |
465 | unsigned int chunk; | |
466 | ||
467 | /* We transfer aligned words. Thus align ADDR down to a word | |
468 | boundary and determine how many bytes to skip at the | |
469 | beginning. */ | |
28f1c605 | 470 | ULONGEST skip = addr & (sizeof (PTRACE_TYPE_RET) - 1); |
87c336f6 AA |
471 | addr -= skip; |
472 | ||
473 | for (n = 0; | |
474 | n < len; | |
475 | n += chunk, addr += sizeof (PTRACE_TYPE_RET), skip = 0) | |
476 | { | |
477 | /* Restrict to a chunk that fits in the current word. */ | |
478 | chunk = std::min (sizeof (PTRACE_TYPE_RET) - skip, len - n); | |
479 | ||
480 | /* Use a union for type punning. */ | |
481 | union | |
482 | { | |
483 | PTRACE_TYPE_RET word; | |
484 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; | |
485 | } buf; | |
486 | ||
487 | /* Read the word, also when doing a partial word write. */ | |
488 | if (readbuf != NULL || chunk < sizeof (PTRACE_TYPE_RET)) | |
489 | { | |
490 | errno = 0; | |
491 | buf.word = ptrace (PT_READ_I, pid, | |
492 | (PTRACE_TYPE_ARG3)(uintptr_t) addr, 0); | |
493 | if (errno != 0) | |
494 | break; | |
495 | if (readbuf != NULL) | |
496 | memcpy (readbuf + n, buf.byte + skip, chunk); | |
497 | } | |
498 | if (writebuf != NULL) | |
499 | { | |
500 | memcpy (buf.byte + skip, writebuf + n, chunk); | |
501 | errno = 0; | |
502 | ptrace (PT_WRITE_D, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, | |
503 | buf.word); | |
504 | if (errno != 0) | |
505 | { | |
506 | /* Using the appropriate one (I or D) is necessary for | |
507 | Gould NP1, at least. */ | |
508 | errno = 0; | |
509 | ptrace (PT_WRITE_I, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, | |
510 | buf.word); | |
511 | if (errno != 0) | |
512 | break; | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | return n; | |
518 | } | |
519 | ||
edcc890f | 520 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 521 | |
9b409511 | 522 | static enum target_xfer_status |
5bf970f9 | 523 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
524 | const char *annex, gdb_byte *readbuf, |
525 | const gdb_byte *writebuf, | |
9b409511 | 526 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 527 | { |
b67aeab0 | 528 | pid_t pid = get_ptrace_pid (inferior_ptid); |
4b8a1a28 | 529 | |
5bf970f9 AC |
530 | switch (object) |
531 | { | |
532 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
533 | #ifdef PT_IO |
534 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
535 | request that promises to be much more efficient in reading | |
536 | and writing data in the traced process's address space. */ | |
537 | { | |
538 | struct ptrace_io_desc piod; | |
4b8a1a28 | 539 | |
f929a579 | 540 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
541 | for instruction and data. However, on OpenBSD 3.9 and |
542 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
543 | mapped read-only. Since most code segments will be | |
544 | read-only, using PIOD_WRITE_D will prevent us from | |
545 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
546 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
547 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
548 | piod.piod_offs = (void *) (long) offset; | |
549 | piod.piod_len = len; | |
550 | ||
551 | errno = 0; | |
4b8a1a28 | 552 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 553 | { |
9b409511 | 554 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
555 | *xfered_len = piod.piod_len; |
556 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 557 | } |
f929a579 AC |
558 | /* If the PT_IO request is somehow not supported, fallback on |
559 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
560 | to indicate failure. */ | |
561 | if (errno != EINVAL) | |
9b409511 | 562 | return TARGET_XFER_EOF; |
f929a579 AC |
563 | } |
564 | #endif | |
87c336f6 AA |
565 | *xfered_len = inf_ptrace_peek_poke (pid, readbuf, writebuf, |
566 | offset, len); | |
567 | return *xfered_len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF; | |
5bf970f9 AC |
568 | |
569 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 570 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
571 | |
572 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
573 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
574 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
575 | request that allows us to read the auxilliary vector. Other | |
576 | BSD's may follow if they feel the need to support PIE. */ | |
577 | { | |
578 | struct ptrace_io_desc piod; | |
579 | ||
580 | if (writebuf) | |
2ed4b548 | 581 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
582 | piod.piod_op = PIOD_READ_AUXV; |
583 | piod.piod_addr = readbuf; | |
584 | piod.piod_offs = (void *) (long) offset; | |
585 | piod.piod_len = len; | |
586 | ||
587 | errno = 0; | |
588 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 589 | { |
9b409511 | 590 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
591 | *xfered_len = piod.piod_len; |
592 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 593 | } |
e8ace1c0 MK |
594 | } |
595 | #endif | |
2ed4b548 | 596 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
597 | |
598 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 599 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
600 | |
601 | default: | |
2ed4b548 | 602 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
603 | } |
604 | } | |
605 | ||
4b8a1a28 | 606 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
607 | |
608 | static int | |
28439f5e | 609 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 610 | { |
4b8a1a28 MK |
611 | /* ??? Is kill the right way to do this? */ |
612 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
613 | } |
614 | ||
615 | /* Print status information about what we're accessing. */ | |
616 | ||
617 | static void | |
618 | inf_ptrace_files_info (struct target_ops *ignore) | |
619 | { | |
181e7f93 PA |
620 | struct inferior *inf = current_inferior (); |
621 | ||
4b8a1a28 | 622 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 623 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 624 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
625 | } |
626 | ||
7a114964 | 627 | static const char * |
117de6a9 PA |
628 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
629 | { | |
630 | return normal_pid_to_str (ptid); | |
631 | } | |
632 | ||
e8ace1c0 MK |
633 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
634 | ||
635 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
636 | Return 0 if *READPTR is already at the end of the buffer. | |
637 | Return -1 if there is insufficient buffer for a whole entry. | |
638 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
639 | ||
640 | static int | |
641 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
642 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
643 | { | |
f5656ead TT |
644 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
645 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
646 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
647 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 648 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
649 | gdb_byte *ptr = *readptr; |
650 | ||
651 | if (endptr == ptr) | |
652 | return 0; | |
653 | ||
654 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
655 | return -1; | |
656 | ||
657 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
658 | ptr += sizeof_auxv_val; /* Alignment. */ | |
659 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
660 | ptr += sizeof_auxv_val; | |
661 | ||
662 | *readptr = ptr; | |
663 | return 1; | |
664 | } | |
665 | ||
666 | #endif | |
667 | ||
8785ced0 MK |
668 | /* Create a prototype ptrace target. The client can override it with |
669 | local methods. */ | |
670 | ||
5bf970f9 AC |
671 | struct target_ops * |
672 | inf_ptrace_target (void) | |
673 | { | |
674 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 675 | |
5bf970f9 | 676 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
677 | t->to_detach = inf_ptrace_detach; |
678 | t->to_resume = inf_ptrace_resume; | |
679 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 680 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 681 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 682 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
683 | #ifdef PT_GET_PROCESS_STATE |
684 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e85e8e5e MK |
685 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; |
686 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; | |
e4ef629d MK |
687 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
688 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 689 | #endif |
5bf970f9 | 690 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 691 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 692 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
bfedc46a | 693 | t->to_interrupt = inf_ptrace_interrupt; |
c7c14b96 | 694 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
695 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
696 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
697 | #endif | |
8785ced0 MK |
698 | |
699 | return t; | |
700 | } | |
701 | \f | |
702 | ||
4b8a1a28 | 703 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 704 | where a particular register is stored. */ |
7714d83a | 705 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
706 | |
707 | /* Fetch register REGNUM from the inferior. */ | |
708 | ||
709 | static void | |
56be3814 | 710 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 711 | { |
ac7936df | 712 | struct gdbarch *gdbarch = regcache->arch (); |
8785ced0 MK |
713 | CORE_ADDR addr; |
714 | size_t size; | |
715 | PTRACE_TYPE_RET *buf; | |
bcc0c096 SM |
716 | pid_t pid; |
717 | int i; | |
8785ced0 | 718 | |
7714d83a | 719 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 720 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 721 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 722 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 723 | { |
56be3814 | 724 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
725 | return; |
726 | } | |
727 | ||
bcc0c096 | 728 | pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
8785ced0 | 729 | |
3b3b1423 | 730 | size = register_size (gdbarch, regnum); |
8785ced0 | 731 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 732 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 733 | |
10d6c8cd | 734 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
735 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
736 | { | |
737 | errno = 0; | |
f7dd0ed7 | 738 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 739 | if (errno != 0) |
4b8a1a28 | 740 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 741 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 742 | regnum, safe_strerror (errno)); |
8785ced0 MK |
743 | |
744 | addr += sizeof (PTRACE_TYPE_RET); | |
745 | } | |
56be3814 | 746 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
747 | } |
748 | ||
749 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
750 | for all registers. */ | |
751 | ||
752 | static void | |
28439f5e PA |
753 | inf_ptrace_fetch_registers (struct target_ops *ops, |
754 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
755 | { |
756 | if (regnum == -1) | |
3b3b1423 | 757 | for (regnum = 0; |
ac7936df | 758 | regnum < gdbarch_num_regs (regcache->arch ()); |
3b3b1423 | 759 | regnum++) |
56be3814 | 760 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 761 | else |
56be3814 | 762 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
763 | } |
764 | ||
765 | /* Store register REGNUM into the inferior. */ | |
766 | ||
767 | static void | |
56be3814 | 768 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 769 | { |
ac7936df | 770 | struct gdbarch *gdbarch = regcache->arch (); |
8785ced0 MK |
771 | CORE_ADDR addr; |
772 | size_t size; | |
773 | PTRACE_TYPE_RET *buf; | |
bcc0c096 SM |
774 | pid_t pid; |
775 | int i; | |
8785ced0 | 776 | |
7714d83a | 777 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 778 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 779 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 780 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
781 | return; |
782 | ||
bcc0c096 | 783 | pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
8785ced0 | 784 | |
3b3b1423 | 785 | size = register_size (gdbarch, regnum); |
8785ced0 | 786 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 787 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 788 | |
10d6c8cd | 789 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 790 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
791 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
792 | { | |
793 | errno = 0; | |
f7dd0ed7 | 794 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 795 | if (errno != 0) |
4b8a1a28 | 796 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 797 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 798 | regnum, safe_strerror (errno)); |
8785ced0 MK |
799 | |
800 | addr += sizeof (PTRACE_TYPE_RET); | |
801 | } | |
802 | } | |
803 | ||
804 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
805 | this for all registers. */ | |
806 | ||
2c0b251b | 807 | static void |
28439f5e PA |
808 | inf_ptrace_store_registers (struct target_ops *ops, |
809 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
810 | { |
811 | if (regnum == -1) | |
3b3b1423 | 812 | for (regnum = 0; |
ac7936df | 813 | regnum < gdbarch_num_regs (regcache->arch ()); |
3b3b1423 | 814 | regnum++) |
56be3814 | 815 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 816 | else |
56be3814 | 817 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
818 | } |
819 | ||
820 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
821 | a function returning the offset within the user area where a | |
822 | particular register is stored. */ | |
823 | ||
824 | struct target_ops * | |
7714d83a UW |
825 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
826 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
827 | { |
828 | struct target_ops *t = inf_ptrace_target(); | |
829 | ||
830 | gdb_assert (register_u_offset); | |
831 | inf_ptrace_register_u_offset = register_u_offset; | |
832 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
833 | t->to_store_registers = inf_ptrace_store_registers; | |
834 | ||
5bf970f9 AC |
835 | return t; |
836 | } |