Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
28e7fd62 | 3 | Copyright (C) 1988-2013 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" |
5bf970f9 | 27 | |
8785ced0 | 28 | #include "gdb_assert.h" |
2c4a536d MK |
29 | #include "gdb_string.h" |
30 | #include "gdb_ptrace.h" | |
34a17005 | 31 | #include "gdb_wait.h" |
5bf970f9 AC |
32 | #include <signal.h> |
33 | ||
2c0b251b | 34 | #include "inf-ptrace.h" |
2c4a536d | 35 | #include "inf-child.h" |
af990527 | 36 | #include "gdbthread.h" |
2c4a536d | 37 | |
c7c14b96 MK |
38 | \f |
39 | ||
735f54b4 MK |
40 | #ifdef PT_GET_PROCESS_STATE |
41 | ||
42 | static int | |
07107ca6 LM |
43 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child, |
44 | int detach_fork) | |
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); | |
25f43500 | 126 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
127 | |
128 | if (! ops_already_pushed) | |
129 | { | |
130 | /* Clear possible core file with its process_stratum. */ | |
131 | push_target (ops); | |
25f43500 | 132 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
133 | } |
134 | ||
136d6dae | 135 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 136 | NULL, NULL, NULL); |
136d6dae | 137 | |
25f43500 | 138 | discard_cleanups (back_to); |
5bf970f9 | 139 | |
c7c14b96 MK |
140 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
141 | be 1 or 2 depending on whether we're starting without or with a | |
142 | shell. */ | |
143 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
144 | ||
145 | /* On some targets, there must be some explicit actions taken after | |
146 | the inferior has been started up. */ | |
147 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
148 | } |
149 | ||
e4ef629d MK |
150 | #ifdef PT_GET_PROCESS_STATE |
151 | ||
152 | static void | |
153 | inf_ptrace_post_startup_inferior (ptid_t pid) | |
154 | { | |
155 | ptrace_event_t pe; | |
156 | ||
157 | /* Set the initial event mask. */ | |
158 | memset (&pe, 0, sizeof pe); | |
159 | pe.pe_set_event |= PTRACE_FORK; | |
160 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
161 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
162 | perror_with_name (("ptrace")); | |
163 | } | |
164 | ||
165 | #endif | |
166 | ||
4b8a1a28 MK |
167 | /* Clean up a rotting corpse of an inferior after it died. */ |
168 | ||
c7c14b96 | 169 | static void |
136d6dae | 170 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 171 | { |
4b8a1a28 MK |
172 | int status; |
173 | ||
174 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 175 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 176 | dealing with a process that we attached to. Such a process will |
3d450bdd | 177 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
178 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
179 | ||
c7c14b96 | 180 | generic_mourn_inferior (); |
d90e17a7 PA |
181 | |
182 | if (!have_inferiors ()) | |
183 | unpush_target (ops); | |
5bf970f9 AC |
184 | } |
185 | ||
4b8a1a28 MK |
186 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
187 | be chatty about it. */ | |
5bf970f9 AC |
188 | |
189 | static void | |
136d6dae | 190 | inf_ptrace_attach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 AC |
191 | { |
192 | char *exec_file; | |
4b8a1a28 | 193 | pid_t pid; |
181e7f93 | 194 | struct inferior *inf; |
5bf970f9 | 195 | |
c0edd9ed JK |
196 | /* Do not change either targets above or the same target if already present. |
197 | The reason is the target stack is shared across multiple inferiors. */ | |
198 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 199 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 200 | |
74164c56 | 201 | pid = parse_pid_to_attach (args); |
5bf970f9 | 202 | |
f6ffd89b | 203 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 204 | error (_("I refuse to debug myself!")); |
5bf970f9 | 205 | |
c0edd9ed JK |
206 | if (! ops_already_pushed) |
207 | { | |
208 | /* target_pid_to_str already uses the target. Also clear possible core | |
209 | file with its process_stratum. */ | |
210 | push_target (ops); | |
25f43500 | 211 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
212 | } |
213 | ||
5bf970f9 AC |
214 | if (from_tty) |
215 | { | |
4b8a1a28 | 216 | exec_file = get_exec_file (0); |
5bf970f9 AC |
217 | |
218 | if (exec_file) | |
a3f17187 | 219 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
220 | target_pid_to_str (pid_to_ptid (pid))); |
221 | else | |
a3f17187 | 222 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
223 | target_pid_to_str (pid_to_ptid (pid))); |
224 | ||
225 | gdb_flush (gdb_stdout); | |
226 | } | |
227 | ||
6e1e94ea MK |
228 | #ifdef PT_ATTACH |
229 | errno = 0; | |
4b8a1a28 | 230 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 231 | if (errno != 0) |
e2e0b3e5 | 232 | perror_with_name (("ptrace")); |
6e1e94ea | 233 | #else |
8a3fe4f8 | 234 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 235 | #endif |
5bf970f9 | 236 | |
6c95b8df PA |
237 | inf = current_inferior (); |
238 | inferior_appeared (inf, pid); | |
181e7f93 | 239 | inf->attach_flag = 1; |
6c95b8df | 240 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 241 | |
af990527 PA |
242 | /* Always add a main thread. If some target extends the ptrace |
243 | target, it should decorate the ptid later with more info. */ | |
244 | add_thread_silent (inferior_ptid); | |
245 | ||
25f43500 | 246 | discard_cleanups (back_to); |
5bf970f9 AC |
247 | } |
248 | ||
e4ef629d MK |
249 | #ifdef PT_GET_PROCESS_STATE |
250 | ||
460fac3c | 251 | static void |
e4ef629d MK |
252 | inf_ptrace_post_attach (int pid) |
253 | { | |
254 | ptrace_event_t pe; | |
255 | ||
256 | /* Set the initial event mask. */ | |
257 | memset (&pe, 0, sizeof pe); | |
258 | pe.pe_set_event |= PTRACE_FORK; | |
259 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
260 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
261 | perror_with_name (("ptrace")); | |
262 | } | |
263 | ||
264 | #endif | |
265 | ||
4b8a1a28 | 266 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 267 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
268 | |
269 | static void | |
136d6dae | 270 | inf_ptrace_detach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 | 271 | { |
4b8a1a28 | 272 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 273 | int sig = 0; |
5bf970f9 AC |
274 | |
275 | if (from_tty) | |
276 | { | |
277 | char *exec_file = get_exec_file (0); | |
278 | if (exec_file == 0) | |
279 | exec_file = ""; | |
a3f17187 | 280 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
281 | target_pid_to_str (pid_to_ptid (pid))); |
282 | gdb_flush (gdb_stdout); | |
283 | } | |
284 | if (args) | |
6e1e94ea | 285 | sig = atoi (args); |
5bf970f9 | 286 | |
6e1e94ea | 287 | #ifdef PT_DETACH |
4b8a1a28 | 288 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 289 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
290 | previously attached to the inferior. It *might* work if we |
291 | started the process ourselves. */ | |
6e1e94ea | 292 | errno = 0; |
4b8a1a28 | 293 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 294 | if (errno != 0) |
e2e0b3e5 | 295 | perror_with_name (("ptrace")); |
6e1e94ea | 296 | #else |
8a3fe4f8 | 297 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 298 | #endif |
5bf970f9 AC |
299 | |
300 | inferior_ptid = null_ptid; | |
7f9f62ba | 301 | detach_inferior (pid); |
7a7d3353 PA |
302 | |
303 | if (!have_inferiors ()) | |
304 | unpush_target (ops); | |
5bf970f9 AC |
305 | } |
306 | ||
4b8a1a28 MK |
307 | /* Kill the inferior. */ |
308 | ||
5bf970f9 | 309 | static void |
7d85a9c0 | 310 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 311 | { |
4b8a1a28 | 312 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 313 | int status; |
c7c14b96 MK |
314 | |
315 | if (pid == 0) | |
316 | return; | |
317 | ||
4b8a1a28 MK |
318 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
319 | waitpid (pid, &status, 0); | |
320 | ||
c7c14b96 | 321 | target_mourn_inferior (); |
5bf970f9 AC |
322 | } |
323 | ||
4b8a1a28 | 324 | /* Stop the inferior. */ |
c7c14b96 | 325 | |
5bf970f9 | 326 | static void |
94cc34af | 327 | inf_ptrace_stop (ptid_t ptid) |
5bf970f9 | 328 | { |
4b8a1a28 MK |
329 | /* Send a SIGINT to the process group. This acts just like the user |
330 | typed a ^C on the controlling terminal. Note that using a | |
331 | negative process number in kill() is a System V-ism. The proper | |
332 | BSD interface is killpg(). However, all modern BSDs support the | |
333 | System V interface too. */ | |
7e1789f5 | 334 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
335 | } |
336 | ||
4b8a1a28 MK |
337 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
338 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
339 | that signal. */ | |
5bf970f9 AC |
340 | |
341 | static void | |
28439f5e | 342 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 343 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 344 | { |
4b8a1a28 | 345 | pid_t pid = ptid_get_pid (ptid); |
a96d9b2e | 346 | int request; |
c7c14b96 MK |
347 | |
348 | if (pid == -1) | |
4b8a1a28 MK |
349 | /* Resume all threads. Traditionally ptrace() only supports |
350 | single-threaded processes, so simply resume the inferior. */ | |
351 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 | 352 | |
a96d9b2e SDJ |
353 | if (catch_syscall_enabled () > 0) |
354 | request = PT_SYSCALL; | |
355 | else | |
356 | request = PT_CONTINUE; | |
357 | ||
c7c14b96 MK |
358 | if (step) |
359 | { | |
360 | /* If this system does not support PT_STEP, a higher level | |
361 | function will have called single_step() to transmute the step | |
362 | request into a continue request (by setting breakpoints on | |
363 | all possible successor instructions), so we don't have to | |
364 | worry about that here. */ | |
365 | request = PT_STEP; | |
366 | } | |
367 | ||
368 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
369 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 370 | already written a new program counter value to the child. */ |
c7c14b96 | 371 | errno = 0; |
2ea28649 | 372 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
373 | if (errno != 0) |
374 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
375 | } |
376 | ||
4b8a1a28 MK |
377 | /* Wait for the child specified by PTID to do something. Return the |
378 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
379 | the status in *OURSTATUS. */ | |
5bf970f9 | 380 | |
c7c14b96 | 381 | static ptid_t |
117de6a9 | 382 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 383 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 384 | { |
4b8a1a28 MK |
385 | pid_t pid; |
386 | int status, save_errno; | |
5bf970f9 | 387 | |
c7c14b96 MK |
388 | do |
389 | { | |
4b8a1a28 | 390 | set_sigint_trap (); |
5bf970f9 | 391 | |
4b8a1a28 MK |
392 | do |
393 | { | |
394 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
395 | save_errno = errno; | |
396 | } | |
397 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 398 | |
c7c14b96 | 399 | clear_sigint_trap (); |
5bf970f9 | 400 | |
c7c14b96 MK |
401 | if (pid == -1) |
402 | { | |
c7c14b96 | 403 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 404 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
405 | safe_strerror (save_errno)); |
406 | ||
407 | /* Claim it exited with unknown signal. */ | |
408 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 409 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 410 | return inferior_ptid; |
c7c14b96 MK |
411 | } |
412 | ||
4b8a1a28 MK |
413 | /* Ignore terminated detached child processes. */ |
414 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
415 | pid = -1; | |
c7c14b96 | 416 | } |
4b8a1a28 | 417 | while (pid == -1); |
c7c14b96 | 418 | |
735f54b4 MK |
419 | #ifdef PT_GET_PROCESS_STATE |
420 | if (WIFSTOPPED (status)) | |
421 | { | |
422 | ptrace_state_t pe; | |
423 | pid_t fpid; | |
424 | ||
425 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
426 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
427 | perror_with_name (("ptrace")); | |
428 | ||
429 | switch (pe.pe_report_event) | |
430 | { | |
431 | case PTRACE_FORK: | |
432 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 433 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
434 | |
435 | /* Make sure the other end of the fork is stopped too. */ | |
436 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
437 | if (fpid == -1) | |
438 | perror_with_name (("waitpid")); | |
439 | ||
440 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
441 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
442 | perror_with_name (("ptrace")); | |
443 | ||
444 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
445 | gdb_assert (pe.pe_other_pid == pid); | |
446 | if (fpid == ptid_get_pid (inferior_ptid)) | |
447 | { | |
3a3e9ee3 | 448 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
449 | return pid_to_ptid (fpid); |
450 | } | |
451 | ||
452 | return pid_to_ptid (pid); | |
453 | } | |
454 | } | |
455 | #endif | |
456 | ||
c7c14b96 MK |
457 | store_waitstatus (ourstatus, status); |
458 | return pid_to_ptid (pid); | |
5bf970f9 AC |
459 | } |
460 | ||
4b8a1a28 MK |
461 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
462 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. | |
463 | Return the number of bytes actually transferred. */ | |
5bf970f9 AC |
464 | |
465 | static LONGEST | |
466 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
961cb7b5 MK |
467 | const char *annex, gdb_byte *readbuf, |
468 | const gdb_byte *writebuf, | |
469 | ULONGEST offset, LONGEST len) | |
5bf970f9 | 470 | { |
4b8a1a28 MK |
471 | pid_t pid = ptid_get_pid (inferior_ptid); |
472 | ||
5bf970f9 AC |
473 | switch (object) |
474 | { | |
475 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
476 | #ifdef PT_IO |
477 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
478 | request that promises to be much more efficient in reading | |
479 | and writing data in the traced process's address space. */ | |
480 | { | |
481 | struct ptrace_io_desc piod; | |
4b8a1a28 | 482 | |
f929a579 | 483 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
484 | for instruction and data. However, on OpenBSD 3.9 and |
485 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
486 | mapped read-only. Since most code segments will be | |
487 | read-only, using PIOD_WRITE_D will prevent us from | |
488 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
489 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
490 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
491 | piod.piod_offs = (void *) (long) offset; | |
492 | piod.piod_len = len; | |
493 | ||
494 | errno = 0; | |
4b8a1a28 | 495 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
f929a579 AC |
496 | /* Return the actual number of bytes read or written. */ |
497 | return piod.piod_len; | |
498 | /* If the PT_IO request is somehow not supported, fallback on | |
499 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
500 | to indicate failure. */ | |
501 | if (errno != EINVAL) | |
502 | return 0; | |
503 | } | |
504 | #endif | |
505 | { | |
506 | union | |
507 | { | |
508 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 509 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
510 | } buffer; |
511 | ULONGEST rounded_offset; | |
512 | LONGEST partial_len; | |
4b8a1a28 | 513 | |
cb85a953 AC |
514 | /* Round the start offset down to the next long word |
515 | boundary. */ | |
f929a579 | 516 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 517 | |
cb85a953 AC |
518 | /* Since ptrace will transfer a single word starting at that |
519 | rounded_offset the partial_len needs to be adjusted down to | |
520 | that (remember this function only does a single transfer). | |
521 | Should the required length be even less, adjust it down | |
522 | again. */ | |
523 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
524 | if (partial_len > len) | |
f929a579 | 525 | partial_len = len; |
4b8a1a28 | 526 | |
f929a579 AC |
527 | if (writebuf) |
528 | { | |
cb85a953 AC |
529 | /* If OFFSET:PARTIAL_LEN is smaller than |
530 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
531 | be needed. Read in the entire word. */ | |
f929a579 | 532 | if (rounded_offset < offset |
cb85a953 AC |
533 | || (offset + partial_len |
534 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 535 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 536 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
537 | (PTRACE_TYPE_ARG3)(uintptr_t) |
538 | rounded_offset, 0); | |
4b8a1a28 | 539 | |
f929a579 AC |
540 | /* Copy data to be written over corresponding part of |
541 | buffer. */ | |
f6ffd89b MK |
542 | memcpy (buffer.byte + (offset - rounded_offset), |
543 | writebuf, partial_len); | |
4b8a1a28 | 544 | |
f929a579 | 545 | errno = 0; |
4b8a1a28 | 546 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
547 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
548 | buffer.word); | |
f929a579 AC |
549 | if (errno) |
550 | { | |
551 | /* Using the appropriate one (I or D) is necessary for | |
552 | Gould NP1, at least. */ | |
553 | errno = 0; | |
4b8a1a28 | 554 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
555 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
556 | buffer.word); | |
f929a579 AC |
557 | if (errno) |
558 | return 0; | |
559 | } | |
560 | } | |
4b8a1a28 | 561 | |
f929a579 AC |
562 | if (readbuf) |
563 | { | |
564 | errno = 0; | |
4b8a1a28 | 565 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
566 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
567 | 0); | |
f929a579 AC |
568 | if (errno) |
569 | return 0; | |
570 | /* Copy appropriate bytes out of the buffer. */ | |
571 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
572 | partial_len); | |
573 | } | |
4b8a1a28 | 574 | |
f929a579 AC |
575 | return partial_len; |
576 | } | |
5bf970f9 AC |
577 | |
578 | case TARGET_OBJECT_UNWIND_TABLE: | |
579 | return -1; | |
580 | ||
581 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
582 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
583 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
584 | request that allows us to read the auxilliary vector. Other | |
585 | BSD's may follow if they feel the need to support PIE. */ | |
586 | { | |
587 | struct ptrace_io_desc piod; | |
588 | ||
589 | if (writebuf) | |
a4d0b831 | 590 | return -1; |
e8ace1c0 MK |
591 | piod.piod_op = PIOD_READ_AUXV; |
592 | piod.piod_addr = readbuf; | |
593 | piod.piod_offs = (void *) (long) offset; | |
594 | piod.piod_len = len; | |
595 | ||
596 | errno = 0; | |
597 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
598 | /* Return the actual number of bytes read or written. */ | |
599 | return piod.piod_len; | |
600 | } | |
601 | #endif | |
5bf970f9 AC |
602 | return -1; |
603 | ||
604 | case TARGET_OBJECT_WCOOKIE: | |
605 | return -1; | |
606 | ||
607 | default: | |
608 | return -1; | |
609 | } | |
610 | } | |
611 | ||
4b8a1a28 | 612 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
613 | |
614 | static int | |
28439f5e | 615 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 616 | { |
4b8a1a28 MK |
617 | /* ??? Is kill the right way to do this? */ |
618 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
619 | } |
620 | ||
621 | /* Print status information about what we're accessing. */ | |
622 | ||
623 | static void | |
624 | inf_ptrace_files_info (struct target_ops *ignore) | |
625 | { | |
181e7f93 PA |
626 | struct inferior *inf = current_inferior (); |
627 | ||
4b8a1a28 | 628 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 629 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 630 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
631 | } |
632 | ||
117de6a9 PA |
633 | static char * |
634 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
635 | { | |
636 | return normal_pid_to_str (ptid); | |
637 | } | |
638 | ||
e8ace1c0 MK |
639 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
640 | ||
641 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
642 | Return 0 if *READPTR is already at the end of the buffer. | |
643 | Return -1 if there is insufficient buffer for a whole entry. | |
644 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
645 | ||
646 | static int | |
647 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
648 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
649 | { | |
f5656ead TT |
650 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
651 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
652 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
653 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 654 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
655 | gdb_byte *ptr = *readptr; |
656 | ||
657 | if (endptr == ptr) | |
658 | return 0; | |
659 | ||
660 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
661 | return -1; | |
662 | ||
663 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
664 | ptr += sizeof_auxv_val; /* Alignment. */ | |
665 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
666 | ptr += sizeof_auxv_val; | |
667 | ||
668 | *readptr = ptr; | |
669 | return 1; | |
670 | } | |
671 | ||
672 | #endif | |
673 | ||
8785ced0 MK |
674 | /* Create a prototype ptrace target. The client can override it with |
675 | local methods. */ | |
676 | ||
5bf970f9 AC |
677 | struct target_ops * |
678 | inf_ptrace_target (void) | |
679 | { | |
680 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 681 | |
5bf970f9 | 682 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
683 | t->to_detach = inf_ptrace_detach; |
684 | t->to_resume = inf_ptrace_resume; | |
685 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 686 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 687 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 688 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
689 | #ifdef PT_GET_PROCESS_STATE |
690 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
691 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
692 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 693 | #endif |
5bf970f9 | 694 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 695 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 696 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 697 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 698 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
699 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
700 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
701 | #endif | |
8785ced0 MK |
702 | |
703 | return t; | |
704 | } | |
705 | \f | |
706 | ||
4b8a1a28 | 707 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 708 | where a particular register is stored. */ |
7714d83a | 709 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
710 | |
711 | /* Fetch register REGNUM from the inferior. */ | |
712 | ||
713 | static void | |
56be3814 | 714 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 715 | { |
3b3b1423 | 716 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
717 | CORE_ADDR addr; |
718 | size_t size; | |
719 | PTRACE_TYPE_RET *buf; | |
720 | int pid, i; | |
721 | ||
7714d83a | 722 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 723 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 724 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 725 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 726 | { |
56be3814 | 727 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
728 | return; |
729 | } | |
730 | ||
8785ced0 | 731 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 732 | separate processes. */ |
8785ced0 MK |
733 | pid = ptid_get_lwp (inferior_ptid); |
734 | if (pid == 0) | |
735 | pid = ptid_get_pid (inferior_ptid); | |
736 | ||
3b3b1423 | 737 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
738 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
739 | buf = alloca (size); | |
740 | ||
10d6c8cd | 741 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
742 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
743 | { | |
744 | errno = 0; | |
f7dd0ed7 | 745 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 746 | if (errno != 0) |
4b8a1a28 | 747 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 748 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 749 | regnum, safe_strerror (errno)); |
8785ced0 MK |
750 | |
751 | addr += sizeof (PTRACE_TYPE_RET); | |
752 | } | |
56be3814 | 753 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
754 | } |
755 | ||
756 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
757 | for all registers. */ | |
758 | ||
759 | static void | |
28439f5e PA |
760 | inf_ptrace_fetch_registers (struct target_ops *ops, |
761 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
762 | { |
763 | if (regnum == -1) | |
3b3b1423 UW |
764 | for (regnum = 0; |
765 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
766 | regnum++) | |
56be3814 | 767 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 768 | else |
56be3814 | 769 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
770 | } |
771 | ||
772 | /* Store register REGNUM into the inferior. */ | |
773 | ||
774 | static void | |
56be3814 | 775 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 776 | { |
3b3b1423 | 777 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
778 | CORE_ADDR addr; |
779 | size_t size; | |
780 | PTRACE_TYPE_RET *buf; | |
781 | int pid, i; | |
782 | ||
7714d83a | 783 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 784 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 785 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 786 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
787 | return; |
788 | ||
8785ced0 | 789 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 790 | separate processes. */ |
8785ced0 MK |
791 | pid = ptid_get_lwp (inferior_ptid); |
792 | if (pid == 0) | |
793 | pid = ptid_get_pid (inferior_ptid); | |
794 | ||
3b3b1423 | 795 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
796 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
797 | buf = alloca (size); | |
798 | ||
10d6c8cd | 799 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 800 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
801 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
802 | { | |
803 | errno = 0; | |
f7dd0ed7 | 804 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 805 | if (errno != 0) |
4b8a1a28 | 806 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 807 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 808 | regnum, safe_strerror (errno)); |
8785ced0 MK |
809 | |
810 | addr += sizeof (PTRACE_TYPE_RET); | |
811 | } | |
812 | } | |
813 | ||
814 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
815 | this for all registers. */ | |
816 | ||
2c0b251b | 817 | static void |
28439f5e PA |
818 | inf_ptrace_store_registers (struct target_ops *ops, |
819 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
820 | { |
821 | if (regnum == -1) | |
3b3b1423 UW |
822 | for (regnum = 0; |
823 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
824 | regnum++) | |
56be3814 | 825 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 826 | else |
56be3814 | 827 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
828 | } |
829 | ||
830 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
831 | a function returning the offset within the user area where a | |
832 | particular register is stored. */ | |
833 | ||
834 | struct target_ops * | |
7714d83a UW |
835 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
836 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
837 | { |
838 | struct target_ops *t = inf_ptrace_target(); | |
839 | ||
840 | gdb_assert (register_u_offset); | |
841 | inf_ptrace_register_u_offset = register_u_offset; | |
842 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
843 | t->to_store_registers = inf_ptrace_store_registers; | |
844 | ||
5bf970f9 AC |
845 | return t; |
846 | } |