Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
ecd75fc8 | 3 | Copyright (C) 1988-2014 Free Software Foundation, Inc. |
5bf970f9 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
5bf970f9 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5bf970f9 AC |
19 | |
20 | #include "defs.h" | |
5bf970f9 | 21 | #include "command.h" |
2c4a536d MK |
22 | #include "inferior.h" |
23 | #include "inflow.h" | |
191c4426 | 24 | #include "terminal.h" |
5bf970f9 | 25 | #include "gdbcore.h" |
8785ced0 | 26 | #include "regcache.h" |
2c4a536d | 27 | #include "gdb_ptrace.h" |
34a17005 | 28 | #include "gdb_wait.h" |
5bf970f9 AC |
29 | #include <signal.h> |
30 | ||
2c0b251b | 31 | #include "inf-ptrace.h" |
2c4a536d | 32 | #include "inf-child.h" |
af990527 | 33 | #include "gdbthread.h" |
2c4a536d | 34 | |
c7c14b96 MK |
35 | \f |
36 | ||
735f54b4 MK |
37 | #ifdef PT_GET_PROCESS_STATE |
38 | ||
39 | static int | |
07107ca6 LM |
40 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child, |
41 | int detach_fork) | |
735f54b4 MK |
42 | { |
43 | pid_t pid, fpid; | |
44 | ptrace_state_t pe; | |
45 | ||
e58b0e63 | 46 | pid = ptid_get_pid (inferior_ptid); |
735f54b4 MK |
47 | |
48 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
49 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
50 | perror_with_name (("ptrace")); | |
51 | ||
52 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
53 | fpid = pe.pe_other_pid; | |
54 | ||
55 | if (follow_child) | |
56 | { | |
191c4426 | 57 | struct inferior *parent_inf, *child_inf; |
4e1c45ea PA |
58 | struct thread_info *tp; |
59 | ||
191c4426 PA |
60 | parent_inf = find_inferior_pid (pid); |
61 | ||
62 | /* Add the child. */ | |
63 | child_inf = add_inferior (fpid); | |
64 | child_inf->attach_flag = parent_inf->attach_flag; | |
65 | copy_terminal_info (child_inf, parent_inf); | |
6479260d JB |
66 | child_inf->pspace = parent_inf->pspace; |
67 | child_inf->aspace = parent_inf->aspace; | |
191c4426 | 68 | |
4e1c45ea PA |
69 | /* Before detaching from the parent, remove all breakpoints from |
70 | it. */ | |
77435e4c | 71 | remove_breakpoints (); |
735f54b4 MK |
72 | |
73 | if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
74 | perror_with_name (("ptrace")); | |
4e1c45ea | 75 | |
7f9f62ba PA |
76 | /* Switch inferior_ptid out of the parent's way. */ |
77 | inferior_ptid = pid_to_ptid (fpid); | |
78 | ||
4e1c45ea | 79 | /* Delete the parent. */ |
7f9f62ba | 80 | detach_inferior (pid); |
4e1c45ea | 81 | |
e58b0e63 | 82 | add_thread_silent (inferior_ptid); |
735f54b4 MK |
83 | } |
84 | else | |
85 | { | |
b242c3c2 PA |
86 | /* Breakpoints have already been detached from the child by |
87 | infrun.c. */ | |
735f54b4 MK |
88 | |
89 | if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
90 | perror_with_name (("ptrace")); | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | #endif /* PT_GET_PROCESS_STATE */ | |
97 | \f | |
98 | ||
4b8a1a28 | 99 | /* Prepare to be traced. */ |
5bf970f9 AC |
100 | |
101 | static void | |
c7c14b96 | 102 | inf_ptrace_me (void) |
5bf970f9 | 103 | { |
c7c14b96 | 104 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 105 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
106 | } |
107 | ||
136d6dae VP |
108 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
109 | run, ALLARGS is a string containing the arguments to the program. | |
110 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
111 | chatty about it. */ | |
5bf970f9 AC |
112 | |
113 | static void | |
136d6dae VP |
114 | inf_ptrace_create_inferior (struct target_ops *ops, |
115 | char *exec_file, char *allargs, char **env, | |
116 | int from_tty) | |
5bf970f9 | 117 | { |
136d6dae VP |
118 | int pid; |
119 | ||
c0edd9ed JK |
120 | /* Do not change either targets above or the same target if already present. |
121 | The reason is the target stack is shared across multiple inferiors. */ | |
122 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 123 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
124 | |
125 | if (! ops_already_pushed) | |
126 | { | |
127 | /* Clear possible core file with its process_stratum. */ | |
128 | push_target (ops); | |
25f43500 | 129 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
130 | } |
131 | ||
136d6dae | 132 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 133 | NULL, NULL, NULL); |
136d6dae | 134 | |
25f43500 | 135 | discard_cleanups (back_to); |
5bf970f9 | 136 | |
c7c14b96 MK |
137 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
138 | ||
139 | /* On some targets, there must be some explicit actions taken after | |
140 | the inferior has been started up. */ | |
141 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
142 | } |
143 | ||
e4ef629d MK |
144 | #ifdef PT_GET_PROCESS_STATE |
145 | ||
146 | static void | |
2e97a79e | 147 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
148 | { |
149 | ptrace_event_t pe; | |
150 | ||
151 | /* Set the initial event mask. */ | |
152 | memset (&pe, 0, sizeof pe); | |
153 | pe.pe_set_event |= PTRACE_FORK; | |
154 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
155 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
156 | perror_with_name (("ptrace")); | |
157 | } | |
158 | ||
159 | #endif | |
160 | ||
4b8a1a28 MK |
161 | /* Clean up a rotting corpse of an inferior after it died. */ |
162 | ||
c7c14b96 | 163 | static void |
136d6dae | 164 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 165 | { |
4b8a1a28 MK |
166 | int status; |
167 | ||
168 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 169 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 170 | dealing with a process that we attached to. Such a process will |
3d450bdd | 171 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
172 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
173 | ||
c1ee2fb3 | 174 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
175 | } |
176 | ||
4b8a1a28 MK |
177 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
178 | be chatty about it. */ | |
5bf970f9 AC |
179 | |
180 | static void | |
c0939df1 | 181 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
182 | { |
183 | char *exec_file; | |
4b8a1a28 | 184 | pid_t pid; |
181e7f93 | 185 | struct inferior *inf; |
5bf970f9 | 186 | |
c0edd9ed JK |
187 | /* Do not change either targets above or the same target if already present. |
188 | The reason is the target stack is shared across multiple inferiors. */ | |
189 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 190 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 191 | |
74164c56 | 192 | pid = parse_pid_to_attach (args); |
5bf970f9 | 193 | |
f6ffd89b | 194 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 195 | error (_("I refuse to debug myself!")); |
5bf970f9 | 196 | |
c0edd9ed JK |
197 | if (! ops_already_pushed) |
198 | { | |
199 | /* target_pid_to_str already uses the target. Also clear possible core | |
200 | file with its process_stratum. */ | |
201 | push_target (ops); | |
25f43500 | 202 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
203 | } |
204 | ||
5bf970f9 AC |
205 | if (from_tty) |
206 | { | |
4b8a1a28 | 207 | exec_file = get_exec_file (0); |
5bf970f9 AC |
208 | |
209 | if (exec_file) | |
a3f17187 | 210 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
211 | target_pid_to_str (pid_to_ptid (pid))); |
212 | else | |
a3f17187 | 213 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
214 | target_pid_to_str (pid_to_ptid (pid))); |
215 | ||
216 | gdb_flush (gdb_stdout); | |
217 | } | |
218 | ||
6e1e94ea MK |
219 | #ifdef PT_ATTACH |
220 | errno = 0; | |
4b8a1a28 | 221 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 222 | if (errno != 0) |
e2e0b3e5 | 223 | perror_with_name (("ptrace")); |
6e1e94ea | 224 | #else |
8a3fe4f8 | 225 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 226 | #endif |
5bf970f9 | 227 | |
6c95b8df PA |
228 | inf = current_inferior (); |
229 | inferior_appeared (inf, pid); | |
181e7f93 | 230 | inf->attach_flag = 1; |
6c95b8df | 231 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 232 | |
af990527 PA |
233 | /* Always add a main thread. If some target extends the ptrace |
234 | target, it should decorate the ptid later with more info. */ | |
235 | add_thread_silent (inferior_ptid); | |
236 | ||
25f43500 | 237 | discard_cleanups (back_to); |
5bf970f9 AC |
238 | } |
239 | ||
e4ef629d MK |
240 | #ifdef PT_GET_PROCESS_STATE |
241 | ||
460fac3c | 242 | static void |
f045800c | 243 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
244 | { |
245 | ptrace_event_t pe; | |
246 | ||
247 | /* Set the initial event mask. */ | |
248 | memset (&pe, 0, sizeof pe); | |
249 | pe.pe_set_event |= PTRACE_FORK; | |
250 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
251 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
252 | perror_with_name (("ptrace")); | |
253 | } | |
254 | ||
255 | #endif | |
256 | ||
4b8a1a28 | 257 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 258 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
259 | |
260 | static void | |
52554a0e | 261 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 262 | { |
4b8a1a28 | 263 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 264 | int sig = 0; |
5bf970f9 AC |
265 | |
266 | if (from_tty) | |
267 | { | |
268 | char *exec_file = get_exec_file (0); | |
269 | if (exec_file == 0) | |
270 | exec_file = ""; | |
a3f17187 | 271 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
272 | target_pid_to_str (pid_to_ptid (pid))); |
273 | gdb_flush (gdb_stdout); | |
274 | } | |
275 | if (args) | |
6e1e94ea | 276 | sig = atoi (args); |
5bf970f9 | 277 | |
6e1e94ea | 278 | #ifdef PT_DETACH |
4b8a1a28 | 279 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 280 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
281 | previously attached to the inferior. It *might* work if we |
282 | started the process ourselves. */ | |
6e1e94ea | 283 | errno = 0; |
4b8a1a28 | 284 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 285 | if (errno != 0) |
e2e0b3e5 | 286 | perror_with_name (("ptrace")); |
6e1e94ea | 287 | #else |
8a3fe4f8 | 288 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 289 | #endif |
5bf970f9 AC |
290 | |
291 | inferior_ptid = null_ptid; | |
7f9f62ba | 292 | detach_inferior (pid); |
7a7d3353 | 293 | |
6a3cb8e8 | 294 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
295 | } |
296 | ||
4b8a1a28 MK |
297 | /* Kill the inferior. */ |
298 | ||
5bf970f9 | 299 | static void |
7d85a9c0 | 300 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 301 | { |
4b8a1a28 | 302 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 303 | int status; |
c7c14b96 MK |
304 | |
305 | if (pid == 0) | |
306 | return; | |
307 | ||
4b8a1a28 MK |
308 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
309 | waitpid (pid, &status, 0); | |
310 | ||
c7c14b96 | 311 | target_mourn_inferior (); |
5bf970f9 AC |
312 | } |
313 | ||
4b8a1a28 | 314 | /* Stop the inferior. */ |
c7c14b96 | 315 | |
5bf970f9 | 316 | static void |
1eab8a48 | 317 | inf_ptrace_stop (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 318 | { |
4b8a1a28 MK |
319 | /* Send a SIGINT to the process group. This acts just like the user |
320 | typed a ^C on the controlling terminal. Note that using a | |
321 | negative process number in kill() is a System V-ism. The proper | |
322 | BSD interface is killpg(). However, all modern BSDs support the | |
323 | System V interface too. */ | |
7e1789f5 | 324 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
325 | } |
326 | ||
4b8a1a28 MK |
327 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
328 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
329 | that signal. */ | |
5bf970f9 AC |
330 | |
331 | static void | |
28439f5e | 332 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 333 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 334 | { |
4b8a1a28 | 335 | pid_t pid = ptid_get_pid (ptid); |
a96d9b2e | 336 | int request; |
c7c14b96 MK |
337 | |
338 | if (pid == -1) | |
4b8a1a28 MK |
339 | /* Resume all threads. Traditionally ptrace() only supports |
340 | single-threaded processes, so simply resume the inferior. */ | |
341 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 | 342 | |
a96d9b2e SDJ |
343 | if (catch_syscall_enabled () > 0) |
344 | request = PT_SYSCALL; | |
345 | else | |
346 | request = PT_CONTINUE; | |
347 | ||
c7c14b96 MK |
348 | if (step) |
349 | { | |
350 | /* If this system does not support PT_STEP, a higher level | |
351 | function will have called single_step() to transmute the step | |
352 | request into a continue request (by setting breakpoints on | |
353 | all possible successor instructions), so we don't have to | |
354 | worry about that here. */ | |
355 | request = PT_STEP; | |
356 | } | |
357 | ||
358 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
359 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 360 | already written a new program counter value to the child. */ |
c7c14b96 | 361 | errno = 0; |
2ea28649 | 362 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
363 | if (errno != 0) |
364 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
365 | } |
366 | ||
4b8a1a28 MK |
367 | /* Wait for the child specified by PTID to do something. Return the |
368 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
369 | the status in *OURSTATUS. */ | |
5bf970f9 | 370 | |
c7c14b96 | 371 | static ptid_t |
117de6a9 | 372 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 373 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 374 | { |
4b8a1a28 MK |
375 | pid_t pid; |
376 | int status, save_errno; | |
5bf970f9 | 377 | |
c7c14b96 MK |
378 | do |
379 | { | |
4b8a1a28 | 380 | set_sigint_trap (); |
5bf970f9 | 381 | |
4b8a1a28 MK |
382 | do |
383 | { | |
384 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
385 | save_errno = errno; | |
386 | } | |
387 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 388 | |
c7c14b96 | 389 | clear_sigint_trap (); |
5bf970f9 | 390 | |
c7c14b96 MK |
391 | if (pid == -1) |
392 | { | |
c7c14b96 | 393 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 394 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
395 | safe_strerror (save_errno)); |
396 | ||
397 | /* Claim it exited with unknown signal. */ | |
398 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 399 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 400 | return inferior_ptid; |
c7c14b96 MK |
401 | } |
402 | ||
4b8a1a28 MK |
403 | /* Ignore terminated detached child processes. */ |
404 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
405 | pid = -1; | |
c7c14b96 | 406 | } |
4b8a1a28 | 407 | while (pid == -1); |
c7c14b96 | 408 | |
735f54b4 MK |
409 | #ifdef PT_GET_PROCESS_STATE |
410 | if (WIFSTOPPED (status)) | |
411 | { | |
412 | ptrace_state_t pe; | |
413 | pid_t fpid; | |
414 | ||
415 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
416 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
417 | perror_with_name (("ptrace")); | |
418 | ||
419 | switch (pe.pe_report_event) | |
420 | { | |
421 | case PTRACE_FORK: | |
422 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 423 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
424 | |
425 | /* Make sure the other end of the fork is stopped too. */ | |
426 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
427 | if (fpid == -1) | |
428 | perror_with_name (("waitpid")); | |
429 | ||
430 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
431 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
432 | perror_with_name (("ptrace")); | |
433 | ||
434 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
435 | gdb_assert (pe.pe_other_pid == pid); | |
436 | if (fpid == ptid_get_pid (inferior_ptid)) | |
437 | { | |
3a3e9ee3 | 438 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
439 | return pid_to_ptid (fpid); |
440 | } | |
441 | ||
442 | return pid_to_ptid (pid); | |
443 | } | |
444 | } | |
445 | #endif | |
446 | ||
c7c14b96 MK |
447 | store_waitstatus (ourstatus, status); |
448 | return pid_to_ptid (pid); | |
5bf970f9 AC |
449 | } |
450 | ||
edcc890f | 451 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 452 | |
9b409511 | 453 | static enum target_xfer_status |
5bf970f9 | 454 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
455 | const char *annex, gdb_byte *readbuf, |
456 | const gdb_byte *writebuf, | |
9b409511 | 457 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 458 | { |
4b8a1a28 MK |
459 | pid_t pid = ptid_get_pid (inferior_ptid); |
460 | ||
5bf970f9 AC |
461 | switch (object) |
462 | { | |
463 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
464 | #ifdef PT_IO |
465 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
466 | request that promises to be much more efficient in reading | |
467 | and writing data in the traced process's address space. */ | |
468 | { | |
469 | struct ptrace_io_desc piod; | |
4b8a1a28 | 470 | |
f929a579 | 471 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
472 | for instruction and data. However, on OpenBSD 3.9 and |
473 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
474 | mapped read-only. Since most code segments will be | |
475 | read-only, using PIOD_WRITE_D will prevent us from | |
476 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
477 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
478 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
479 | piod.piod_offs = (void *) (long) offset; | |
480 | piod.piod_len = len; | |
481 | ||
482 | errno = 0; | |
4b8a1a28 | 483 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 484 | { |
9b409511 | 485 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
486 | *xfered_len = piod.piod_len; |
487 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 488 | } |
f929a579 AC |
489 | /* If the PT_IO request is somehow not supported, fallback on |
490 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
491 | to indicate failure. */ | |
492 | if (errno != EINVAL) | |
9b409511 | 493 | return TARGET_XFER_EOF; |
f929a579 AC |
494 | } |
495 | #endif | |
496 | { | |
497 | union | |
498 | { | |
499 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 500 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
501 | } buffer; |
502 | ULONGEST rounded_offset; | |
9b409511 | 503 | ULONGEST partial_len; |
4b8a1a28 | 504 | |
cb85a953 AC |
505 | /* Round the start offset down to the next long word |
506 | boundary. */ | |
f929a579 | 507 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 508 | |
cb85a953 AC |
509 | /* Since ptrace will transfer a single word starting at that |
510 | rounded_offset the partial_len needs to be adjusted down to | |
511 | that (remember this function only does a single transfer). | |
512 | Should the required length be even less, adjust it down | |
513 | again. */ | |
514 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
515 | if (partial_len > len) | |
f929a579 | 516 | partial_len = len; |
4b8a1a28 | 517 | |
f929a579 AC |
518 | if (writebuf) |
519 | { | |
cb85a953 AC |
520 | /* If OFFSET:PARTIAL_LEN is smaller than |
521 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
522 | be needed. Read in the entire word. */ | |
f929a579 | 523 | if (rounded_offset < offset |
cb85a953 AC |
524 | || (offset + partial_len |
525 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 526 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 527 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
528 | (PTRACE_TYPE_ARG3)(uintptr_t) |
529 | rounded_offset, 0); | |
4b8a1a28 | 530 | |
f929a579 AC |
531 | /* Copy data to be written over corresponding part of |
532 | buffer. */ | |
f6ffd89b MK |
533 | memcpy (buffer.byte + (offset - rounded_offset), |
534 | writebuf, partial_len); | |
4b8a1a28 | 535 | |
f929a579 | 536 | errno = 0; |
4b8a1a28 | 537 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
538 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
539 | buffer.word); | |
f929a579 AC |
540 | if (errno) |
541 | { | |
542 | /* Using the appropriate one (I or D) is necessary for | |
543 | Gould NP1, at least. */ | |
544 | errno = 0; | |
4b8a1a28 | 545 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
546 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
547 | buffer.word); | |
f929a579 | 548 | if (errno) |
9b409511 | 549 | return TARGET_XFER_EOF; |
f929a579 AC |
550 | } |
551 | } | |
4b8a1a28 | 552 | |
f929a579 AC |
553 | if (readbuf) |
554 | { | |
555 | errno = 0; | |
4b8a1a28 | 556 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
557 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
558 | 0); | |
f929a579 | 559 | if (errno) |
9b409511 | 560 | return TARGET_XFER_EOF; |
f929a579 AC |
561 | /* Copy appropriate bytes out of the buffer. */ |
562 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
563 | partial_len); | |
564 | } | |
4b8a1a28 | 565 | |
9b409511 YQ |
566 | *xfered_len = partial_len; |
567 | return TARGET_XFER_OK; | |
f929a579 | 568 | } |
5bf970f9 AC |
569 | |
570 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 571 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
572 | |
573 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
574 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
575 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
576 | request that allows us to read the auxilliary vector. Other | |
577 | BSD's may follow if they feel the need to support PIE. */ | |
578 | { | |
579 | struct ptrace_io_desc piod; | |
580 | ||
581 | if (writebuf) | |
2ed4b548 | 582 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
583 | piod.piod_op = PIOD_READ_AUXV; |
584 | piod.piod_addr = readbuf; | |
585 | piod.piod_offs = (void *) (long) offset; | |
586 | piod.piod_len = len; | |
587 | ||
588 | errno = 0; | |
589 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 590 | { |
9b409511 | 591 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
592 | *xfered_len = piod.piod_len; |
593 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 594 | } |
e8ace1c0 MK |
595 | } |
596 | #endif | |
2ed4b548 | 597 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
598 | |
599 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 600 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
601 | |
602 | default: | |
2ed4b548 | 603 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
604 | } |
605 | } | |
606 | ||
4b8a1a28 | 607 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
608 | |
609 | static int | |
28439f5e | 610 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 611 | { |
4b8a1a28 MK |
612 | /* ??? Is kill the right way to do this? */ |
613 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
614 | } |
615 | ||
616 | /* Print status information about what we're accessing. */ | |
617 | ||
618 | static void | |
619 | inf_ptrace_files_info (struct target_ops *ignore) | |
620 | { | |
181e7f93 PA |
621 | struct inferior *inf = current_inferior (); |
622 | ||
4b8a1a28 | 623 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 624 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 625 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
626 | } |
627 | ||
117de6a9 PA |
628 | static char * |
629 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
630 | { | |
631 | return normal_pid_to_str (ptid); | |
632 | } | |
633 | ||
e8ace1c0 MK |
634 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
635 | ||
636 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
637 | Return 0 if *READPTR is already at the end of the buffer. | |
638 | Return -1 if there is insufficient buffer for a whole entry. | |
639 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
640 | ||
641 | static int | |
642 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
643 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
644 | { | |
f5656ead TT |
645 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
646 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
647 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
648 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 649 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
650 | gdb_byte *ptr = *readptr; |
651 | ||
652 | if (endptr == ptr) | |
653 | return 0; | |
654 | ||
655 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
656 | return -1; | |
657 | ||
658 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
659 | ptr += sizeof_auxv_val; /* Alignment. */ | |
660 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
661 | ptr += sizeof_auxv_val; | |
662 | ||
663 | *readptr = ptr; | |
664 | return 1; | |
665 | } | |
666 | ||
667 | #endif | |
668 | ||
8785ced0 MK |
669 | /* Create a prototype ptrace target. The client can override it with |
670 | local methods. */ | |
671 | ||
5bf970f9 AC |
672 | struct target_ops * |
673 | inf_ptrace_target (void) | |
674 | { | |
675 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 676 | |
5bf970f9 | 677 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
678 | t->to_detach = inf_ptrace_detach; |
679 | t->to_resume = inf_ptrace_resume; | |
680 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 681 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 682 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 683 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
684 | #ifdef PT_GET_PROCESS_STATE |
685 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
686 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
687 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 688 | #endif |
5bf970f9 | 689 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 690 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 691 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 692 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 693 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
694 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
695 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
696 | #endif | |
8785ced0 MK |
697 | |
698 | return t; | |
699 | } | |
700 | \f | |
701 | ||
4b8a1a28 | 702 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 703 | where a particular register is stored. */ |
7714d83a | 704 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
705 | |
706 | /* Fetch register REGNUM from the inferior. */ | |
707 | ||
708 | static void | |
56be3814 | 709 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 710 | { |
3b3b1423 | 711 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
712 | CORE_ADDR addr; |
713 | size_t size; | |
714 | PTRACE_TYPE_RET *buf; | |
715 | int pid, i; | |
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 | ||
8785ced0 | 726 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 727 | separate processes. */ |
8785ced0 MK |
728 | pid = ptid_get_lwp (inferior_ptid); |
729 | if (pid == 0) | |
730 | pid = ptid_get_pid (inferior_ptid); | |
731 | ||
3b3b1423 | 732 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
733 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
734 | buf = alloca (size); | |
735 | ||
10d6c8cd | 736 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
737 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
738 | { | |
739 | errno = 0; | |
f7dd0ed7 | 740 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 741 | if (errno != 0) |
4b8a1a28 | 742 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 743 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 744 | regnum, safe_strerror (errno)); |
8785ced0 MK |
745 | |
746 | addr += sizeof (PTRACE_TYPE_RET); | |
747 | } | |
56be3814 | 748 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
749 | } |
750 | ||
751 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
752 | for all registers. */ | |
753 | ||
754 | static void | |
28439f5e PA |
755 | inf_ptrace_fetch_registers (struct target_ops *ops, |
756 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
757 | { |
758 | if (regnum == -1) | |
3b3b1423 UW |
759 | for (regnum = 0; |
760 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
761 | regnum++) | |
56be3814 | 762 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 763 | else |
56be3814 | 764 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
765 | } |
766 | ||
767 | /* Store register REGNUM into the inferior. */ | |
768 | ||
769 | static void | |
56be3814 | 770 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 771 | { |
3b3b1423 | 772 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
773 | CORE_ADDR addr; |
774 | size_t size; | |
775 | PTRACE_TYPE_RET *buf; | |
776 | int pid, i; | |
777 | ||
7714d83a | 778 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 779 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 780 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 781 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
782 | return; |
783 | ||
8785ced0 | 784 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 785 | separate processes. */ |
8785ced0 MK |
786 | pid = ptid_get_lwp (inferior_ptid); |
787 | if (pid == 0) | |
788 | pid = ptid_get_pid (inferior_ptid); | |
789 | ||
3b3b1423 | 790 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
791 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
792 | buf = alloca (size); | |
793 | ||
10d6c8cd | 794 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 795 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
796 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
797 | { | |
798 | errno = 0; | |
f7dd0ed7 | 799 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 800 | if (errno != 0) |
4b8a1a28 | 801 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 802 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 803 | regnum, safe_strerror (errno)); |
8785ced0 MK |
804 | |
805 | addr += sizeof (PTRACE_TYPE_RET); | |
806 | } | |
807 | } | |
808 | ||
809 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
810 | this for all registers. */ | |
811 | ||
2c0b251b | 812 | static void |
28439f5e PA |
813 | inf_ptrace_store_registers (struct target_ops *ops, |
814 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
815 | { |
816 | if (regnum == -1) | |
3b3b1423 UW |
817 | for (regnum = 0; |
818 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
819 | regnum++) | |
56be3814 | 820 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 821 | else |
56be3814 | 822 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
823 | } |
824 | ||
825 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
826 | a function returning the offset within the user area where a | |
827 | particular register is stored. */ | |
828 | ||
829 | struct target_ops * | |
7714d83a UW |
830 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
831 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
832 | { |
833 | struct target_ops *t = inf_ptrace_target(); | |
834 | ||
835 | gdb_assert (register_u_offset); | |
836 | inf_ptrace_register_u_offset = register_u_offset; | |
837 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
838 | t->to_store_registers = inf_ptrace_store_registers; | |
839 | ||
5bf970f9 AC |
840 | return t; |
841 | } |