Commit | Line | Data |
---|---|---|
2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
0b302171 JB |
3 | Copyright (C) 1988-1996, 1998-2002, 2004-2012 Free Software |
4 | Foundation, Inc. | |
5bf970f9 AC |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
5bf970f9 AC |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5bf970f9 AC |
20 | |
21 | #include "defs.h" | |
5bf970f9 | 22 | #include "command.h" |
2c4a536d MK |
23 | #include "inferior.h" |
24 | #include "inflow.h" | |
191c4426 | 25 | #include "terminal.h" |
5bf970f9 | 26 | #include "gdbcore.h" |
8785ced0 | 27 | #include "regcache.h" |
5bf970f9 | 28 | |
8785ced0 | 29 | #include "gdb_assert.h" |
2c4a536d MK |
30 | #include "gdb_string.h" |
31 | #include "gdb_ptrace.h" | |
34a17005 | 32 | #include "gdb_wait.h" |
5bf970f9 AC |
33 | #include <signal.h> |
34 | ||
2c0b251b | 35 | #include "inf-ptrace.h" |
2c4a536d | 36 | #include "inf-child.h" |
af990527 | 37 | #include "gdbthread.h" |
2c4a536d | 38 | |
c7c14b96 MK |
39 | \f |
40 | ||
735f54b4 MK |
41 | #ifdef PT_GET_PROCESS_STATE |
42 | ||
43 | static int | |
ee057212 | 44 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child) |
735f54b4 MK |
45 | { |
46 | pid_t pid, fpid; | |
47 | ptrace_state_t pe; | |
48 | ||
e58b0e63 | 49 | pid = ptid_get_pid (inferior_ptid); |
735f54b4 MK |
50 | |
51 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
52 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
53 | perror_with_name (("ptrace")); | |
54 | ||
55 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
56 | fpid = pe.pe_other_pid; | |
57 | ||
58 | if (follow_child) | |
59 | { | |
191c4426 | 60 | struct inferior *parent_inf, *child_inf; |
4e1c45ea PA |
61 | struct thread_info *tp; |
62 | ||
191c4426 PA |
63 | parent_inf = find_inferior_pid (pid); |
64 | ||
65 | /* Add the child. */ | |
66 | child_inf = add_inferior (fpid); | |
67 | child_inf->attach_flag = parent_inf->attach_flag; | |
68 | copy_terminal_info (child_inf, parent_inf); | |
6479260d JB |
69 | child_inf->pspace = parent_inf->pspace; |
70 | child_inf->aspace = parent_inf->aspace; | |
191c4426 | 71 | |
4e1c45ea PA |
72 | /* Before detaching from the parent, remove all breakpoints from |
73 | it. */ | |
77435e4c | 74 | remove_breakpoints (); |
735f54b4 MK |
75 | |
76 | if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
77 | perror_with_name (("ptrace")); | |
4e1c45ea | 78 | |
7f9f62ba PA |
79 | /* Switch inferior_ptid out of the parent's way. */ |
80 | inferior_ptid = pid_to_ptid (fpid); | |
81 | ||
4e1c45ea | 82 | /* Delete the parent. */ |
7f9f62ba | 83 | detach_inferior (pid); |
4e1c45ea | 84 | |
e58b0e63 | 85 | add_thread_silent (inferior_ptid); |
735f54b4 MK |
86 | } |
87 | else | |
88 | { | |
b242c3c2 PA |
89 | /* Breakpoints have already been detached from the child by |
90 | infrun.c. */ | |
735f54b4 MK |
91 | |
92 | if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
93 | perror_with_name (("ptrace")); | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | #endif /* PT_GET_PROCESS_STATE */ | |
100 | \f | |
101 | ||
4b8a1a28 | 102 | /* Prepare to be traced. */ |
5bf970f9 AC |
103 | |
104 | static void | |
c7c14b96 | 105 | inf_ptrace_me (void) |
5bf970f9 | 106 | { |
c7c14b96 | 107 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 108 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
109 | } |
110 | ||
136d6dae VP |
111 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
112 | run, ALLARGS is a string containing the arguments to the program. | |
113 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
114 | chatty about it. */ | |
5bf970f9 AC |
115 | |
116 | static void | |
136d6dae VP |
117 | inf_ptrace_create_inferior (struct target_ops *ops, |
118 | char *exec_file, char *allargs, char **env, | |
119 | int from_tty) | |
5bf970f9 | 120 | { |
136d6dae VP |
121 | int pid; |
122 | ||
c0edd9ed JK |
123 | /* Do not change either targets above or the same target if already present. |
124 | The reason is the target stack is shared across multiple inferiors. */ | |
125 | int ops_already_pushed = target_is_pushed (ops); | |
26590820 | 126 | struct cleanup *back_to = NULL; |
c0edd9ed JK |
127 | |
128 | if (! ops_already_pushed) | |
129 | { | |
130 | /* Clear possible core file with its process_stratum. */ | |
131 | push_target (ops); | |
132 | back_to = make_cleanup_unpush_target (ops); | |
133 | } | |
134 | ||
136d6dae | 135 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 136 | NULL, NULL, NULL); |
136d6dae | 137 | |
c0edd9ed JK |
138 | if (! ops_already_pushed) |
139 | discard_cleanups (back_to); | |
5bf970f9 | 140 | |
c7c14b96 MK |
141 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
142 | be 1 or 2 depending on whether we're starting without or with a | |
143 | shell. */ | |
144 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
145 | ||
146 | /* On some targets, there must be some explicit actions taken after | |
147 | the inferior has been started up. */ | |
148 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
149 | } |
150 | ||
e4ef629d MK |
151 | #ifdef PT_GET_PROCESS_STATE |
152 | ||
153 | static void | |
154 | inf_ptrace_post_startup_inferior (ptid_t pid) | |
155 | { | |
156 | ptrace_event_t pe; | |
157 | ||
158 | /* Set the initial event mask. */ | |
159 | memset (&pe, 0, sizeof pe); | |
160 | pe.pe_set_event |= PTRACE_FORK; | |
161 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
162 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
163 | perror_with_name (("ptrace")); | |
164 | } | |
165 | ||
166 | #endif | |
167 | ||
4b8a1a28 MK |
168 | /* Clean up a rotting corpse of an inferior after it died. */ |
169 | ||
c7c14b96 | 170 | static void |
136d6dae | 171 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 172 | { |
4b8a1a28 MK |
173 | int status; |
174 | ||
175 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 176 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 177 | dealing with a process that we attached to. Such a process will |
3d450bdd | 178 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
179 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
180 | ||
c7c14b96 | 181 | generic_mourn_inferior (); |
d90e17a7 PA |
182 | |
183 | if (!have_inferiors ()) | |
184 | unpush_target (ops); | |
5bf970f9 AC |
185 | } |
186 | ||
4b8a1a28 MK |
187 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
188 | be chatty about it. */ | |
5bf970f9 AC |
189 | |
190 | static void | |
136d6dae | 191 | inf_ptrace_attach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 AC |
192 | { |
193 | char *exec_file; | |
4b8a1a28 | 194 | pid_t pid; |
181e7f93 | 195 | struct inferior *inf; |
5bf970f9 | 196 | |
c0edd9ed JK |
197 | /* Do not change either targets above or the same target if already present. |
198 | The reason is the target stack is shared across multiple inferiors. */ | |
199 | int ops_already_pushed = target_is_pushed (ops); | |
26590820 | 200 | struct cleanup *back_to = NULL; |
c0edd9ed | 201 | |
74164c56 | 202 | pid = parse_pid_to_attach (args); |
5bf970f9 | 203 | |
f6ffd89b | 204 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 205 | error (_("I refuse to debug myself!")); |
5bf970f9 | 206 | |
c0edd9ed JK |
207 | if (! ops_already_pushed) |
208 | { | |
209 | /* target_pid_to_str already uses the target. Also clear possible core | |
210 | file with its process_stratum. */ | |
211 | push_target (ops); | |
212 | back_to = make_cleanup_unpush_target (ops); | |
213 | } | |
214 | ||
5bf970f9 AC |
215 | if (from_tty) |
216 | { | |
4b8a1a28 | 217 | exec_file = get_exec_file (0); |
5bf970f9 AC |
218 | |
219 | if (exec_file) | |
a3f17187 | 220 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
221 | target_pid_to_str (pid_to_ptid (pid))); |
222 | else | |
a3f17187 | 223 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
224 | target_pid_to_str (pid_to_ptid (pid))); |
225 | ||
226 | gdb_flush (gdb_stdout); | |
227 | } | |
228 | ||
6e1e94ea MK |
229 | #ifdef PT_ATTACH |
230 | errno = 0; | |
4b8a1a28 | 231 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 232 | if (errno != 0) |
e2e0b3e5 | 233 | perror_with_name (("ptrace")); |
6e1e94ea | 234 | #else |
8a3fe4f8 | 235 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 236 | #endif |
5bf970f9 | 237 | |
6c95b8df PA |
238 | inf = current_inferior (); |
239 | inferior_appeared (inf, pid); | |
181e7f93 | 240 | inf->attach_flag = 1; |
6c95b8df | 241 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 242 | |
af990527 PA |
243 | /* Always add a main thread. If some target extends the ptrace |
244 | target, it should decorate the ptid later with more info. */ | |
245 | add_thread_silent (inferior_ptid); | |
246 | ||
c0edd9ed JK |
247 | if (! ops_already_pushed) |
248 | discard_cleanups (back_to); | |
5bf970f9 AC |
249 | } |
250 | ||
e4ef629d MK |
251 | #ifdef PT_GET_PROCESS_STATE |
252 | ||
460fac3c | 253 | static void |
e4ef629d MK |
254 | inf_ptrace_post_attach (int pid) |
255 | { | |
256 | ptrace_event_t pe; | |
257 | ||
258 | /* Set the initial event mask. */ | |
259 | memset (&pe, 0, sizeof pe); | |
260 | pe.pe_set_event |= PTRACE_FORK; | |
261 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
262 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
263 | perror_with_name (("ptrace")); | |
264 | } | |
265 | ||
266 | #endif | |
267 | ||
4b8a1a28 | 268 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 269 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
270 | |
271 | static void | |
136d6dae | 272 | inf_ptrace_detach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 | 273 | { |
4b8a1a28 | 274 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 275 | int sig = 0; |
5bf970f9 AC |
276 | |
277 | if (from_tty) | |
278 | { | |
279 | char *exec_file = get_exec_file (0); | |
280 | if (exec_file == 0) | |
281 | exec_file = ""; | |
a3f17187 | 282 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
283 | target_pid_to_str (pid_to_ptid (pid))); |
284 | gdb_flush (gdb_stdout); | |
285 | } | |
286 | if (args) | |
6e1e94ea | 287 | sig = atoi (args); |
5bf970f9 | 288 | |
6e1e94ea | 289 | #ifdef PT_DETACH |
4b8a1a28 | 290 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 291 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
292 | previously attached to the inferior. It *might* work if we |
293 | started the process ourselves. */ | |
6e1e94ea | 294 | errno = 0; |
4b8a1a28 | 295 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 296 | if (errno != 0) |
e2e0b3e5 | 297 | perror_with_name (("ptrace")); |
6e1e94ea | 298 | #else |
8a3fe4f8 | 299 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 300 | #endif |
5bf970f9 AC |
301 | |
302 | inferior_ptid = null_ptid; | |
7f9f62ba | 303 | detach_inferior (pid); |
7a7d3353 PA |
304 | |
305 | if (!have_inferiors ()) | |
306 | unpush_target (ops); | |
5bf970f9 AC |
307 | } |
308 | ||
4b8a1a28 MK |
309 | /* Kill the inferior. */ |
310 | ||
5bf970f9 | 311 | static void |
7d85a9c0 | 312 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 313 | { |
4b8a1a28 | 314 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 315 | int status; |
c7c14b96 MK |
316 | |
317 | if (pid == 0) | |
318 | return; | |
319 | ||
4b8a1a28 MK |
320 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
321 | waitpid (pid, &status, 0); | |
322 | ||
c7c14b96 | 323 | target_mourn_inferior (); |
5bf970f9 AC |
324 | } |
325 | ||
4b8a1a28 | 326 | /* Stop the inferior. */ |
c7c14b96 | 327 | |
5bf970f9 | 328 | static void |
94cc34af | 329 | inf_ptrace_stop (ptid_t ptid) |
5bf970f9 | 330 | { |
4b8a1a28 MK |
331 | /* Send a SIGINT to the process group. This acts just like the user |
332 | typed a ^C on the controlling terminal. Note that using a | |
333 | negative process number in kill() is a System V-ism. The proper | |
334 | BSD interface is killpg(). However, all modern BSDs support the | |
335 | System V interface too. */ | |
7e1789f5 | 336 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
337 | } |
338 | ||
4b8a1a28 MK |
339 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
340 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
341 | that signal. */ | |
5bf970f9 AC |
342 | |
343 | static void | |
28439f5e | 344 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 345 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 346 | { |
4b8a1a28 | 347 | pid_t pid = ptid_get_pid (ptid); |
a96d9b2e | 348 | int request; |
c7c14b96 MK |
349 | |
350 | if (pid == -1) | |
4b8a1a28 MK |
351 | /* Resume all threads. Traditionally ptrace() only supports |
352 | single-threaded processes, so simply resume the inferior. */ | |
353 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 | 354 | |
a96d9b2e SDJ |
355 | if (catch_syscall_enabled () > 0) |
356 | request = PT_SYSCALL; | |
357 | else | |
358 | request = PT_CONTINUE; | |
359 | ||
c7c14b96 MK |
360 | if (step) |
361 | { | |
362 | /* If this system does not support PT_STEP, a higher level | |
363 | function will have called single_step() to transmute the step | |
364 | request into a continue request (by setting breakpoints on | |
365 | all possible successor instructions), so we don't have to | |
366 | worry about that here. */ | |
367 | request = PT_STEP; | |
368 | } | |
369 | ||
370 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
371 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 372 | already written a new program counter value to the child. */ |
c7c14b96 | 373 | errno = 0; |
2ea28649 | 374 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
375 | if (errno != 0) |
376 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
377 | } |
378 | ||
4b8a1a28 MK |
379 | /* Wait for the child specified by PTID to do something. Return the |
380 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
381 | the status in *OURSTATUS. */ | |
5bf970f9 | 382 | |
c7c14b96 | 383 | static ptid_t |
117de6a9 | 384 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 385 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 386 | { |
4b8a1a28 MK |
387 | pid_t pid; |
388 | int status, save_errno; | |
5bf970f9 | 389 | |
c7c14b96 MK |
390 | do |
391 | { | |
4b8a1a28 | 392 | set_sigint_trap (); |
5bf970f9 | 393 | |
4b8a1a28 MK |
394 | do |
395 | { | |
396 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
397 | save_errno = errno; | |
398 | } | |
399 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 400 | |
c7c14b96 | 401 | clear_sigint_trap (); |
5bf970f9 | 402 | |
c7c14b96 MK |
403 | if (pid == -1) |
404 | { | |
c7c14b96 | 405 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 406 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
407 | safe_strerror (save_errno)); |
408 | ||
409 | /* Claim it exited with unknown signal. */ | |
410 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 411 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 412 | return inferior_ptid; |
c7c14b96 MK |
413 | } |
414 | ||
4b8a1a28 MK |
415 | /* Ignore terminated detached child processes. */ |
416 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
417 | pid = -1; | |
c7c14b96 | 418 | } |
4b8a1a28 | 419 | while (pid == -1); |
c7c14b96 | 420 | |
735f54b4 MK |
421 | #ifdef PT_GET_PROCESS_STATE |
422 | if (WIFSTOPPED (status)) | |
423 | { | |
424 | ptrace_state_t pe; | |
425 | pid_t fpid; | |
426 | ||
427 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
428 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
429 | perror_with_name (("ptrace")); | |
430 | ||
431 | switch (pe.pe_report_event) | |
432 | { | |
433 | case PTRACE_FORK: | |
434 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 435 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
436 | |
437 | /* Make sure the other end of the fork is stopped too. */ | |
438 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
439 | if (fpid == -1) | |
440 | perror_with_name (("waitpid")); | |
441 | ||
442 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
443 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
444 | perror_with_name (("ptrace")); | |
445 | ||
446 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
447 | gdb_assert (pe.pe_other_pid == pid); | |
448 | if (fpid == ptid_get_pid (inferior_ptid)) | |
449 | { | |
3a3e9ee3 | 450 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
451 | return pid_to_ptid (fpid); |
452 | } | |
453 | ||
454 | return pid_to_ptid (pid); | |
455 | } | |
456 | } | |
457 | #endif | |
458 | ||
c7c14b96 MK |
459 | store_waitstatus (ourstatus, status); |
460 | return pid_to_ptid (pid); | |
5bf970f9 AC |
461 | } |
462 | ||
4b8a1a28 MK |
463 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
464 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. | |
465 | Return the number of bytes actually transferred. */ | |
5bf970f9 AC |
466 | |
467 | static LONGEST | |
468 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
961cb7b5 MK |
469 | const char *annex, gdb_byte *readbuf, |
470 | const gdb_byte *writebuf, | |
471 | ULONGEST offset, LONGEST len) | |
5bf970f9 | 472 | { |
4b8a1a28 MK |
473 | pid_t pid = ptid_get_pid (inferior_ptid); |
474 | ||
5bf970f9 AC |
475 | switch (object) |
476 | { | |
477 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
478 | #ifdef PT_IO |
479 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
480 | request that promises to be much more efficient in reading | |
481 | and writing data in the traced process's address space. */ | |
482 | { | |
483 | struct ptrace_io_desc piod; | |
4b8a1a28 | 484 | |
f929a579 | 485 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
486 | for instruction and data. However, on OpenBSD 3.9 and |
487 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
488 | mapped read-only. Since most code segments will be | |
489 | read-only, using PIOD_WRITE_D will prevent us from | |
490 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
491 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
492 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
493 | piod.piod_offs = (void *) (long) offset; | |
494 | piod.piod_len = len; | |
495 | ||
496 | errno = 0; | |
4b8a1a28 | 497 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
f929a579 AC |
498 | /* Return the actual number of bytes read or written. */ |
499 | return piod.piod_len; | |
500 | /* If the PT_IO request is somehow not supported, fallback on | |
501 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
502 | to indicate failure. */ | |
503 | if (errno != EINVAL) | |
504 | return 0; | |
505 | } | |
506 | #endif | |
507 | { | |
508 | union | |
509 | { | |
510 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 511 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
512 | } buffer; |
513 | ULONGEST rounded_offset; | |
514 | LONGEST partial_len; | |
4b8a1a28 | 515 | |
cb85a953 AC |
516 | /* Round the start offset down to the next long word |
517 | boundary. */ | |
f929a579 | 518 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 519 | |
cb85a953 AC |
520 | /* Since ptrace will transfer a single word starting at that |
521 | rounded_offset the partial_len needs to be adjusted down to | |
522 | that (remember this function only does a single transfer). | |
523 | Should the required length be even less, adjust it down | |
524 | again. */ | |
525 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
526 | if (partial_len > len) | |
f929a579 | 527 | partial_len = len; |
4b8a1a28 | 528 | |
f929a579 AC |
529 | if (writebuf) |
530 | { | |
cb85a953 AC |
531 | /* If OFFSET:PARTIAL_LEN is smaller than |
532 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
533 | be needed. Read in the entire word. */ | |
f929a579 | 534 | if (rounded_offset < offset |
cb85a953 AC |
535 | || (offset + partial_len |
536 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 537 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 538 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
539 | (PTRACE_TYPE_ARG3)(uintptr_t) |
540 | rounded_offset, 0); | |
4b8a1a28 | 541 | |
f929a579 AC |
542 | /* Copy data to be written over corresponding part of |
543 | buffer. */ | |
f6ffd89b MK |
544 | memcpy (buffer.byte + (offset - rounded_offset), |
545 | writebuf, partial_len); | |
4b8a1a28 | 546 | |
f929a579 | 547 | errno = 0; |
4b8a1a28 | 548 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
549 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
550 | buffer.word); | |
f929a579 AC |
551 | if (errno) |
552 | { | |
553 | /* Using the appropriate one (I or D) is necessary for | |
554 | Gould NP1, at least. */ | |
555 | errno = 0; | |
4b8a1a28 | 556 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
557 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
558 | buffer.word); | |
f929a579 AC |
559 | if (errno) |
560 | return 0; | |
561 | } | |
562 | } | |
4b8a1a28 | 563 | |
f929a579 AC |
564 | if (readbuf) |
565 | { | |
566 | errno = 0; | |
4b8a1a28 | 567 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
568 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
569 | 0); | |
f929a579 AC |
570 | if (errno) |
571 | return 0; | |
572 | /* Copy appropriate bytes out of the buffer. */ | |
573 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
574 | partial_len); | |
575 | } | |
4b8a1a28 | 576 | |
f929a579 AC |
577 | return partial_len; |
578 | } | |
5bf970f9 AC |
579 | |
580 | case TARGET_OBJECT_UNWIND_TABLE: | |
581 | return -1; | |
582 | ||
583 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
584 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
585 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
586 | request that allows us to read the auxilliary vector. Other | |
587 | BSD's may follow if they feel the need to support PIE. */ | |
588 | { | |
589 | struct ptrace_io_desc piod; | |
590 | ||
591 | if (writebuf) | |
a4d0b831 | 592 | return -1; |
e8ace1c0 MK |
593 | piod.piod_op = PIOD_READ_AUXV; |
594 | piod.piod_addr = readbuf; | |
595 | piod.piod_offs = (void *) (long) offset; | |
596 | piod.piod_len = len; | |
597 | ||
598 | errno = 0; | |
599 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
600 | /* Return the actual number of bytes read or written. */ | |
601 | return piod.piod_len; | |
602 | } | |
603 | #endif | |
5bf970f9 AC |
604 | return -1; |
605 | ||
606 | case TARGET_OBJECT_WCOOKIE: | |
607 | return -1; | |
608 | ||
609 | default: | |
610 | return -1; | |
611 | } | |
612 | } | |
613 | ||
4b8a1a28 | 614 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
615 | |
616 | static int | |
28439f5e | 617 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 618 | { |
4b8a1a28 MK |
619 | /* ??? Is kill the right way to do this? */ |
620 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
621 | } |
622 | ||
623 | /* Print status information about what we're accessing. */ | |
624 | ||
625 | static void | |
626 | inf_ptrace_files_info (struct target_ops *ignore) | |
627 | { | |
181e7f93 PA |
628 | struct inferior *inf = current_inferior (); |
629 | ||
4b8a1a28 | 630 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 631 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 632 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
633 | } |
634 | ||
117de6a9 PA |
635 | static char * |
636 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
637 | { | |
638 | return normal_pid_to_str (ptid); | |
639 | } | |
640 | ||
e8ace1c0 MK |
641 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
642 | ||
643 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
644 | Return 0 if *READPTR is already at the end of the buffer. | |
645 | Return -1 if there is insufficient buffer for a whole entry. | |
646 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
647 | ||
648 | static int | |
649 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
650 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
651 | { | |
652 | struct type *int_type = builtin_type (target_gdbarch)->builtin_int; | |
653 | struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr; | |
654 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); | |
655 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
656 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
657 | gdb_byte *ptr = *readptr; | |
658 | ||
659 | if (endptr == ptr) | |
660 | return 0; | |
661 | ||
662 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
663 | return -1; | |
664 | ||
665 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
666 | ptr += sizeof_auxv_val; /* Alignment. */ | |
667 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
668 | ptr += sizeof_auxv_val; | |
669 | ||
670 | *readptr = ptr; | |
671 | return 1; | |
672 | } | |
673 | ||
674 | #endif | |
675 | ||
8785ced0 MK |
676 | /* Create a prototype ptrace target. The client can override it with |
677 | local methods. */ | |
678 | ||
5bf970f9 AC |
679 | struct target_ops * |
680 | inf_ptrace_target (void) | |
681 | { | |
682 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 683 | |
5bf970f9 | 684 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
685 | t->to_detach = inf_ptrace_detach; |
686 | t->to_resume = inf_ptrace_resume; | |
687 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 688 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 689 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 690 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
691 | #ifdef PT_GET_PROCESS_STATE |
692 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
693 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
694 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 695 | #endif |
5bf970f9 | 696 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 697 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 698 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 699 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 700 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
701 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
702 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
703 | #endif | |
8785ced0 MK |
704 | |
705 | return t; | |
706 | } | |
707 | \f | |
708 | ||
4b8a1a28 | 709 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 710 | where a particular register is stored. */ |
7714d83a | 711 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
712 | |
713 | /* Fetch register REGNUM from the inferior. */ | |
714 | ||
715 | static void | |
56be3814 | 716 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 717 | { |
3b3b1423 | 718 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
719 | CORE_ADDR addr; |
720 | size_t size; | |
721 | PTRACE_TYPE_RET *buf; | |
722 | int pid, i; | |
723 | ||
7714d83a | 724 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 725 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 726 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 727 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 728 | { |
56be3814 | 729 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
730 | return; |
731 | } | |
732 | ||
8785ced0 | 733 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 734 | separate processes. */ |
8785ced0 MK |
735 | pid = ptid_get_lwp (inferior_ptid); |
736 | if (pid == 0) | |
737 | pid = ptid_get_pid (inferior_ptid); | |
738 | ||
3b3b1423 | 739 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
740 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
741 | buf = alloca (size); | |
742 | ||
10d6c8cd | 743 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
744 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
745 | { | |
746 | errno = 0; | |
f7dd0ed7 | 747 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 748 | if (errno != 0) |
4b8a1a28 | 749 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 750 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 751 | regnum, safe_strerror (errno)); |
8785ced0 MK |
752 | |
753 | addr += sizeof (PTRACE_TYPE_RET); | |
754 | } | |
56be3814 | 755 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
756 | } |
757 | ||
758 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
759 | for all registers. */ | |
760 | ||
761 | static void | |
28439f5e PA |
762 | inf_ptrace_fetch_registers (struct target_ops *ops, |
763 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
764 | { |
765 | if (regnum == -1) | |
3b3b1423 UW |
766 | for (regnum = 0; |
767 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
768 | regnum++) | |
56be3814 | 769 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 770 | else |
56be3814 | 771 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
772 | } |
773 | ||
774 | /* Store register REGNUM into the inferior. */ | |
775 | ||
776 | static void | |
56be3814 | 777 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 778 | { |
3b3b1423 | 779 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
780 | CORE_ADDR addr; |
781 | size_t size; | |
782 | PTRACE_TYPE_RET *buf; | |
783 | int pid, i; | |
784 | ||
7714d83a | 785 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 786 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 787 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 788 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
789 | return; |
790 | ||
8785ced0 | 791 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 792 | separate processes. */ |
8785ced0 MK |
793 | pid = ptid_get_lwp (inferior_ptid); |
794 | if (pid == 0) | |
795 | pid = ptid_get_pid (inferior_ptid); | |
796 | ||
3b3b1423 | 797 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
798 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
799 | buf = alloca (size); | |
800 | ||
10d6c8cd | 801 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 802 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
803 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
804 | { | |
805 | errno = 0; | |
f7dd0ed7 | 806 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 807 | if (errno != 0) |
4b8a1a28 | 808 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 809 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 810 | regnum, safe_strerror (errno)); |
8785ced0 MK |
811 | |
812 | addr += sizeof (PTRACE_TYPE_RET); | |
813 | } | |
814 | } | |
815 | ||
816 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
817 | this for all registers. */ | |
818 | ||
2c0b251b | 819 | static void |
28439f5e PA |
820 | inf_ptrace_store_registers (struct target_ops *ops, |
821 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
822 | { |
823 | if (regnum == -1) | |
3b3b1423 UW |
824 | for (regnum = 0; |
825 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
826 | regnum++) | |
56be3814 | 827 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 828 | else |
56be3814 | 829 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
830 | } |
831 | ||
832 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
833 | a function returning the offset within the user area where a | |
834 | particular register is stored. */ | |
835 | ||
836 | struct target_ops * | |
7714d83a UW |
837 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
838 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
839 | { |
840 | struct target_ops *t = inf_ptrace_target(); | |
841 | ||
842 | gdb_assert (register_u_offset); | |
843 | inf_ptrace_register_u_offset = register_u_offset; | |
844 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
845 | t->to_store_registers = inf_ptrace_store_registers; | |
846 | ||
5bf970f9 AC |
847 | return t; |
848 | } |