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 | |
bc09b0c1 | 266 | inf_ptrace_detach_success (ops, inf); |
ced2dffb PA |
267 | } |
268 | ||
269 | /* See inf-ptrace.h. */ | |
270 | ||
271 | void | |
bc09b0c1 | 272 | inf_ptrace_detach_success (struct target_ops *ops, inferior *inf) |
ced2dffb | 273 | { |
5bf970f9 | 274 | inferior_ptid = null_ptid; |
bc09b0c1 | 275 | detach_inferior (inf); |
7a7d3353 | 276 | |
6a3cb8e8 | 277 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
278 | } |
279 | ||
4b8a1a28 MK |
280 | /* Kill the inferior. */ |
281 | ||
5bf970f9 | 282 | static void |
7d85a9c0 | 283 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 284 | { |
4b8a1a28 | 285 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 286 | int status; |
c7c14b96 MK |
287 | |
288 | if (pid == 0) | |
289 | return; | |
290 | ||
4b8a1a28 MK |
291 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
292 | waitpid (pid, &status, 0); | |
293 | ||
bc1e6c81 | 294 | target_mourn_inferior (inferior_ptid); |
5bf970f9 AC |
295 | } |
296 | ||
bfedc46a | 297 | /* Interrupt the inferior. */ |
c7c14b96 | 298 | |
5bf970f9 | 299 | static void |
bfedc46a | 300 | inf_ptrace_interrupt (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 301 | { |
4b8a1a28 MK |
302 | /* Send a SIGINT to the process group. This acts just like the user |
303 | typed a ^C on the controlling terminal. Note that using a | |
304 | negative process number in kill() is a System V-ism. The proper | |
305 | BSD interface is killpg(). However, all modern BSDs support the | |
306 | System V interface too. */ | |
7e1789f5 | 307 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
308 | } |
309 | ||
90ad5e1d PA |
310 | /* Return which PID to pass to ptrace in order to observe/control the |
311 | tracee identified by PTID. */ | |
312 | ||
94309df7 | 313 | pid_t |
90ad5e1d PA |
314 | get_ptrace_pid (ptid_t ptid) |
315 | { | |
316 | pid_t pid; | |
317 | ||
318 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
319 | dealing with a non-threaded program/target. */ | |
320 | pid = ptid_get_lwp (ptid); | |
321 | if (pid == 0) | |
322 | pid = ptid_get_pid (ptid); | |
323 | return pid; | |
324 | } | |
325 | ||
4b8a1a28 MK |
326 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
327 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
328 | that signal. */ | |
5bf970f9 AC |
329 | |
330 | static void | |
28439f5e | 331 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 332 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 333 | { |
90ad5e1d | 334 | pid_t pid; |
a96d9b2e | 335 | int request; |
c7c14b96 | 336 | |
90ad5e1d | 337 | if (ptid_equal (minus_one_ptid, ptid)) |
4b8a1a28 MK |
338 | /* Resume all threads. Traditionally ptrace() only supports |
339 | single-threaded processes, so simply resume the inferior. */ | |
c1593e4f | 340 | pid = ptid_get_pid (inferior_ptid); |
90ad5e1d PA |
341 | else |
342 | pid = get_ptrace_pid (ptid); | |
c7c14b96 | 343 | |
a96d9b2e SDJ |
344 | if (catch_syscall_enabled () > 0) |
345 | request = PT_SYSCALL; | |
346 | else | |
347 | request = PT_CONTINUE; | |
348 | ||
c7c14b96 MK |
349 | if (step) |
350 | { | |
351 | /* If this system does not support PT_STEP, a higher level | |
352 | function will have called single_step() to transmute the step | |
353 | request into a continue request (by setting breakpoints on | |
354 | all possible successor instructions), so we don't have to | |
355 | worry about that here. */ | |
356 | request = PT_STEP; | |
357 | } | |
358 | ||
359 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
360 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 361 | already written a new program counter value to the child. */ |
c7c14b96 | 362 | errno = 0; |
2ea28649 | 363 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
364 | if (errno != 0) |
365 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
366 | } |
367 | ||
4b8a1a28 MK |
368 | /* Wait for the child specified by PTID to do something. Return the |
369 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
370 | the status in *OURSTATUS. */ | |
5bf970f9 | 371 | |
c7c14b96 | 372 | static ptid_t |
117de6a9 | 373 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 374 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 375 | { |
4b8a1a28 MK |
376 | pid_t pid; |
377 | int status, save_errno; | |
5bf970f9 | 378 | |
c7c14b96 MK |
379 | do |
380 | { | |
4b8a1a28 | 381 | set_sigint_trap (); |
5bf970f9 | 382 | |
4b8a1a28 MK |
383 | do |
384 | { | |
385 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
386 | save_errno = errno; | |
387 | } | |
388 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 389 | |
c7c14b96 | 390 | clear_sigint_trap (); |
5bf970f9 | 391 | |
c7c14b96 MK |
392 | if (pid == -1) |
393 | { | |
c7c14b96 | 394 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 395 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
396 | safe_strerror (save_errno)); |
397 | ||
398 | /* Claim it exited with unknown signal. */ | |
399 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 400 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 401 | return inferior_ptid; |
c7c14b96 MK |
402 | } |
403 | ||
4b8a1a28 MK |
404 | /* Ignore terminated detached child processes. */ |
405 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
406 | pid = -1; | |
c7c14b96 | 407 | } |
4b8a1a28 | 408 | while (pid == -1); |
c7c14b96 | 409 | |
735f54b4 MK |
410 | #ifdef PT_GET_PROCESS_STATE |
411 | if (WIFSTOPPED (status)) | |
412 | { | |
413 | ptrace_state_t pe; | |
414 | pid_t fpid; | |
415 | ||
416 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
417 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
418 | perror_with_name (("ptrace")); | |
419 | ||
420 | switch (pe.pe_report_event) | |
421 | { | |
422 | case PTRACE_FORK: | |
423 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 424 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
425 | |
426 | /* Make sure the other end of the fork is stopped too. */ | |
427 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
428 | if (fpid == -1) | |
429 | perror_with_name (("waitpid")); | |
430 | ||
431 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
432 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
433 | perror_with_name (("ptrace")); | |
434 | ||
435 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
436 | gdb_assert (pe.pe_other_pid == pid); | |
437 | if (fpid == ptid_get_pid (inferior_ptid)) | |
438 | { | |
3a3e9ee3 | 439 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
440 | return pid_to_ptid (fpid); |
441 | } | |
442 | ||
443 | return pid_to_ptid (pid); | |
444 | } | |
445 | } | |
446 | #endif | |
447 | ||
c7c14b96 MK |
448 | store_waitstatus (ourstatus, status); |
449 | return pid_to_ptid (pid); | |
5bf970f9 AC |
450 | } |
451 | ||
87c336f6 AA |
452 | /* Transfer data via ptrace into process PID's memory from WRITEBUF, or |
453 | from process PID's memory into READBUF. Start at target address ADDR | |
454 | and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must | |
455 | be non-null. Return the number of transferred bytes. */ | |
456 | ||
457 | static ULONGEST | |
458 | inf_ptrace_peek_poke (pid_t pid, gdb_byte *readbuf, | |
459 | const gdb_byte *writebuf, | |
460 | ULONGEST addr, ULONGEST len) | |
461 | { | |
462 | ULONGEST n; | |
463 | unsigned int chunk; | |
464 | ||
465 | /* We transfer aligned words. Thus align ADDR down to a word | |
466 | boundary and determine how many bytes to skip at the | |
467 | beginning. */ | |
28f1c605 | 468 | ULONGEST skip = addr & (sizeof (PTRACE_TYPE_RET) - 1); |
87c336f6 AA |
469 | addr -= skip; |
470 | ||
471 | for (n = 0; | |
472 | n < len; | |
473 | n += chunk, addr += sizeof (PTRACE_TYPE_RET), skip = 0) | |
474 | { | |
475 | /* Restrict to a chunk that fits in the current word. */ | |
476 | chunk = std::min (sizeof (PTRACE_TYPE_RET) - skip, len - n); | |
477 | ||
478 | /* Use a union for type punning. */ | |
479 | union | |
480 | { | |
481 | PTRACE_TYPE_RET word; | |
482 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; | |
483 | } buf; | |
484 | ||
485 | /* Read the word, also when doing a partial word write. */ | |
486 | if (readbuf != NULL || chunk < sizeof (PTRACE_TYPE_RET)) | |
487 | { | |
488 | errno = 0; | |
489 | buf.word = ptrace (PT_READ_I, pid, | |
490 | (PTRACE_TYPE_ARG3)(uintptr_t) addr, 0); | |
491 | if (errno != 0) | |
492 | break; | |
493 | if (readbuf != NULL) | |
494 | memcpy (readbuf + n, buf.byte + skip, chunk); | |
495 | } | |
496 | if (writebuf != NULL) | |
497 | { | |
498 | memcpy (buf.byte + skip, writebuf + n, chunk); | |
499 | errno = 0; | |
500 | ptrace (PT_WRITE_D, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, | |
501 | buf.word); | |
502 | if (errno != 0) | |
503 | { | |
504 | /* Using the appropriate one (I or D) is necessary for | |
505 | Gould NP1, at least. */ | |
506 | errno = 0; | |
507 | ptrace (PT_WRITE_I, pid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, | |
508 | buf.word); | |
509 | if (errno != 0) | |
510 | break; | |
511 | } | |
512 | } | |
513 | } | |
514 | ||
515 | return n; | |
516 | } | |
517 | ||
edcc890f | 518 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 519 | |
9b409511 | 520 | static enum target_xfer_status |
5bf970f9 | 521 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
522 | const char *annex, gdb_byte *readbuf, |
523 | const gdb_byte *writebuf, | |
9b409511 | 524 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 525 | { |
b67aeab0 | 526 | pid_t pid = get_ptrace_pid (inferior_ptid); |
4b8a1a28 | 527 | |
5bf970f9 AC |
528 | switch (object) |
529 | { | |
530 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
531 | #ifdef PT_IO |
532 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
533 | request that promises to be much more efficient in reading | |
534 | and writing data in the traced process's address space. */ | |
535 | { | |
536 | struct ptrace_io_desc piod; | |
4b8a1a28 | 537 | |
f929a579 | 538 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
539 | for instruction and data. However, on OpenBSD 3.9 and |
540 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
541 | mapped read-only. Since most code segments will be | |
542 | read-only, using PIOD_WRITE_D will prevent us from | |
543 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
544 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
545 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
546 | piod.piod_offs = (void *) (long) offset; | |
547 | piod.piod_len = len; | |
548 | ||
549 | errno = 0; | |
4b8a1a28 | 550 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 551 | { |
9b409511 | 552 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
553 | *xfered_len = piod.piod_len; |
554 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 555 | } |
f929a579 AC |
556 | /* If the PT_IO request is somehow not supported, fallback on |
557 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
558 | to indicate failure. */ | |
559 | if (errno != EINVAL) | |
9b409511 | 560 | return TARGET_XFER_EOF; |
f929a579 AC |
561 | } |
562 | #endif | |
87c336f6 AA |
563 | *xfered_len = inf_ptrace_peek_poke (pid, readbuf, writebuf, |
564 | offset, len); | |
565 | return *xfered_len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF; | |
5bf970f9 AC |
566 | |
567 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 568 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
569 | |
570 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
571 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
572 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
573 | request that allows us to read the auxilliary vector. Other | |
574 | BSD's may follow if they feel the need to support PIE. */ | |
575 | { | |
576 | struct ptrace_io_desc piod; | |
577 | ||
578 | if (writebuf) | |
2ed4b548 | 579 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
580 | piod.piod_op = PIOD_READ_AUXV; |
581 | piod.piod_addr = readbuf; | |
582 | piod.piod_offs = (void *) (long) offset; | |
583 | piod.piod_len = len; | |
584 | ||
585 | errno = 0; | |
586 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 587 | { |
9b409511 | 588 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
589 | *xfered_len = piod.piod_len; |
590 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 591 | } |
e8ace1c0 MK |
592 | } |
593 | #endif | |
2ed4b548 | 594 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
595 | |
596 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 597 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
598 | |
599 | default: | |
2ed4b548 | 600 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
601 | } |
602 | } | |
603 | ||
4b8a1a28 | 604 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
605 | |
606 | static int | |
28439f5e | 607 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 608 | { |
4b8a1a28 MK |
609 | /* ??? Is kill the right way to do this? */ |
610 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
611 | } |
612 | ||
613 | /* Print status information about what we're accessing. */ | |
614 | ||
615 | static void | |
616 | inf_ptrace_files_info (struct target_ops *ignore) | |
617 | { | |
181e7f93 PA |
618 | struct inferior *inf = current_inferior (); |
619 | ||
4b8a1a28 | 620 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 621 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 622 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
623 | } |
624 | ||
7a114964 | 625 | static const char * |
117de6a9 PA |
626 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) |
627 | { | |
628 | return normal_pid_to_str (ptid); | |
629 | } | |
630 | ||
e8ace1c0 MK |
631 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
632 | ||
633 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
634 | Return 0 if *READPTR is already at the end of the buffer. | |
635 | Return -1 if there is insufficient buffer for a whole entry. | |
636 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
637 | ||
638 | static int | |
639 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
640 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
641 | { | |
f5656ead TT |
642 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
643 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
644 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
645 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 646 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
647 | gdb_byte *ptr = *readptr; |
648 | ||
649 | if (endptr == ptr) | |
650 | return 0; | |
651 | ||
652 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
653 | return -1; | |
654 | ||
655 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
656 | ptr += sizeof_auxv_val; /* Alignment. */ | |
657 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
658 | ptr += sizeof_auxv_val; | |
659 | ||
660 | *readptr = ptr; | |
661 | return 1; | |
662 | } | |
663 | ||
664 | #endif | |
665 | ||
8785ced0 MK |
666 | /* Create a prototype ptrace target. The client can override it with |
667 | local methods. */ | |
668 | ||
5bf970f9 AC |
669 | struct target_ops * |
670 | inf_ptrace_target (void) | |
671 | { | |
672 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 673 | |
5bf970f9 | 674 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
675 | t->to_detach = inf_ptrace_detach; |
676 | t->to_resume = inf_ptrace_resume; | |
677 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 678 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 679 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 680 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
681 | #ifdef PT_GET_PROCESS_STATE |
682 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e85e8e5e MK |
683 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; |
684 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; | |
e4ef629d MK |
685 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
686 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 687 | #endif |
5bf970f9 | 688 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 689 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 690 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
bfedc46a | 691 | t->to_interrupt = inf_ptrace_interrupt; |
c7c14b96 | 692 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
693 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
694 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
695 | #endif | |
8785ced0 MK |
696 | |
697 | return t; | |
698 | } | |
699 | \f | |
700 | ||
4b8a1a28 | 701 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 702 | where a particular register is stored. */ |
7714d83a | 703 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
704 | |
705 | /* Fetch register REGNUM from the inferior. */ | |
706 | ||
707 | static void | |
56be3814 | 708 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 709 | { |
ac7936df | 710 | struct gdbarch *gdbarch = regcache->arch (); |
8785ced0 MK |
711 | CORE_ADDR addr; |
712 | size_t size; | |
713 | PTRACE_TYPE_RET *buf; | |
bcc0c096 SM |
714 | pid_t pid; |
715 | int i; | |
8785ced0 | 716 | |
7714d83a | 717 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 718 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 719 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 720 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 721 | { |
56be3814 | 722 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
723 | return; |
724 | } | |
725 | ||
bcc0c096 | 726 | pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
8785ced0 | 727 | |
3b3b1423 | 728 | size = register_size (gdbarch, regnum); |
8785ced0 | 729 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 730 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 731 | |
10d6c8cd | 732 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
733 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
734 | { | |
735 | errno = 0; | |
f7dd0ed7 | 736 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 737 | if (errno != 0) |
4b8a1a28 | 738 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 739 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 740 | regnum, safe_strerror (errno)); |
8785ced0 MK |
741 | |
742 | addr += sizeof (PTRACE_TYPE_RET); | |
743 | } | |
56be3814 | 744 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
745 | } |
746 | ||
747 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
748 | for all registers. */ | |
749 | ||
750 | static void | |
28439f5e PA |
751 | inf_ptrace_fetch_registers (struct target_ops *ops, |
752 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
753 | { |
754 | if (regnum == -1) | |
3b3b1423 | 755 | for (regnum = 0; |
ac7936df | 756 | regnum < gdbarch_num_regs (regcache->arch ()); |
3b3b1423 | 757 | regnum++) |
56be3814 | 758 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 759 | else |
56be3814 | 760 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
761 | } |
762 | ||
763 | /* Store register REGNUM into the inferior. */ | |
764 | ||
765 | static void | |
56be3814 | 766 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 767 | { |
ac7936df | 768 | struct gdbarch *gdbarch = regcache->arch (); |
8785ced0 MK |
769 | CORE_ADDR addr; |
770 | size_t size; | |
771 | PTRACE_TYPE_RET *buf; | |
bcc0c096 SM |
772 | pid_t pid; |
773 | int i; | |
8785ced0 | 774 | |
7714d83a | 775 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 776 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 777 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 778 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
779 | return; |
780 | ||
bcc0c096 | 781 | pid = get_ptrace_pid (regcache_get_ptid (regcache)); |
8785ced0 | 782 | |
3b3b1423 | 783 | size = register_size (gdbarch, regnum); |
8785ced0 | 784 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
4397c913 | 785 | buf = (PTRACE_TYPE_RET *) alloca (size); |
8785ced0 | 786 | |
10d6c8cd | 787 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 788 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
789 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
790 | { | |
791 | errno = 0; | |
f7dd0ed7 | 792 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 793 | if (errno != 0) |
4b8a1a28 | 794 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 795 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 796 | regnum, safe_strerror (errno)); |
8785ced0 MK |
797 | |
798 | addr += sizeof (PTRACE_TYPE_RET); | |
799 | } | |
800 | } | |
801 | ||
802 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
803 | this for all registers. */ | |
804 | ||
2c0b251b | 805 | static void |
28439f5e PA |
806 | inf_ptrace_store_registers (struct target_ops *ops, |
807 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
808 | { |
809 | if (regnum == -1) | |
3b3b1423 | 810 | for (regnum = 0; |
ac7936df | 811 | regnum < gdbarch_num_regs (regcache->arch ()); |
3b3b1423 | 812 | regnum++) |
56be3814 | 813 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 814 | else |
56be3814 | 815 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
816 | } |
817 | ||
818 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
819 | a function returning the offset within the user area where a | |
820 | particular register is stored. */ | |
821 | ||
822 | struct target_ops * | |
7714d83a UW |
823 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
824 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
825 | { |
826 | struct target_ops *t = inf_ptrace_target(); | |
827 | ||
828 | gdb_assert (register_u_offset); | |
829 | inf_ptrace_register_u_offset = register_u_offset; | |
830 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
831 | t->to_store_registers = inf_ptrace_store_registers; | |
832 | ||
5bf970f9 AC |
833 | return t; |
834 | } |