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" |
5bf970f9 | 27 | |
8785ced0 | 28 | #include "gdb_assert.h" |
0e9f083f | 29 | #include <string.h> |
2c4a536d | 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 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
141 | ||
142 | /* On some targets, there must be some explicit actions taken after | |
143 | the inferior has been started up. */ | |
144 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
145 | } |
146 | ||
e4ef629d MK |
147 | #ifdef PT_GET_PROCESS_STATE |
148 | ||
149 | static void | |
2e97a79e | 150 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
151 | { |
152 | ptrace_event_t pe; | |
153 | ||
154 | /* Set the initial event mask. */ | |
155 | memset (&pe, 0, sizeof pe); | |
156 | pe.pe_set_event |= PTRACE_FORK; | |
157 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
158 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
159 | perror_with_name (("ptrace")); | |
160 | } | |
161 | ||
162 | #endif | |
163 | ||
4b8a1a28 MK |
164 | /* Clean up a rotting corpse of an inferior after it died. */ |
165 | ||
c7c14b96 | 166 | static void |
136d6dae | 167 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 168 | { |
4b8a1a28 MK |
169 | int status; |
170 | ||
171 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 172 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 173 | dealing with a process that we attached to. Such a process will |
3d450bdd | 174 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
175 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
176 | ||
c1ee2fb3 | 177 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
178 | } |
179 | ||
4b8a1a28 MK |
180 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
181 | be chatty about it. */ | |
5bf970f9 AC |
182 | |
183 | static void | |
c0939df1 | 184 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
185 | { |
186 | char *exec_file; | |
4b8a1a28 | 187 | pid_t pid; |
181e7f93 | 188 | struct inferior *inf; |
5bf970f9 | 189 | |
c0edd9ed JK |
190 | /* Do not change either targets above or the same target if already present. |
191 | The reason is the target stack is shared across multiple inferiors. */ | |
192 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 193 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 194 | |
74164c56 | 195 | pid = parse_pid_to_attach (args); |
5bf970f9 | 196 | |
f6ffd89b | 197 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 198 | error (_("I refuse to debug myself!")); |
5bf970f9 | 199 | |
c0edd9ed JK |
200 | if (! ops_already_pushed) |
201 | { | |
202 | /* target_pid_to_str already uses the target. Also clear possible core | |
203 | file with its process_stratum. */ | |
204 | push_target (ops); | |
25f43500 | 205 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
206 | } |
207 | ||
5bf970f9 AC |
208 | if (from_tty) |
209 | { | |
4b8a1a28 | 210 | exec_file = get_exec_file (0); |
5bf970f9 AC |
211 | |
212 | if (exec_file) | |
a3f17187 | 213 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
214 | target_pid_to_str (pid_to_ptid (pid))); |
215 | else | |
a3f17187 | 216 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
217 | target_pid_to_str (pid_to_ptid (pid))); |
218 | ||
219 | gdb_flush (gdb_stdout); | |
220 | } | |
221 | ||
6e1e94ea MK |
222 | #ifdef PT_ATTACH |
223 | errno = 0; | |
4b8a1a28 | 224 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 225 | if (errno != 0) |
e2e0b3e5 | 226 | perror_with_name (("ptrace")); |
6e1e94ea | 227 | #else |
8a3fe4f8 | 228 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 229 | #endif |
5bf970f9 | 230 | |
6c95b8df PA |
231 | inf = current_inferior (); |
232 | inferior_appeared (inf, pid); | |
181e7f93 | 233 | inf->attach_flag = 1; |
6c95b8df | 234 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 235 | |
af990527 PA |
236 | /* Always add a main thread. If some target extends the ptrace |
237 | target, it should decorate the ptid later with more info. */ | |
238 | add_thread_silent (inferior_ptid); | |
239 | ||
25f43500 | 240 | discard_cleanups (back_to); |
5bf970f9 AC |
241 | } |
242 | ||
e4ef629d MK |
243 | #ifdef PT_GET_PROCESS_STATE |
244 | ||
460fac3c | 245 | static void |
f045800c | 246 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
247 | { |
248 | ptrace_event_t pe; | |
249 | ||
250 | /* Set the initial event mask. */ | |
251 | memset (&pe, 0, sizeof pe); | |
252 | pe.pe_set_event |= PTRACE_FORK; | |
253 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
254 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
255 | perror_with_name (("ptrace")); | |
256 | } | |
257 | ||
258 | #endif | |
259 | ||
4b8a1a28 | 260 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 261 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
262 | |
263 | static void | |
52554a0e | 264 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 265 | { |
4b8a1a28 | 266 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 267 | int sig = 0; |
5bf970f9 AC |
268 | |
269 | if (from_tty) | |
270 | { | |
271 | char *exec_file = get_exec_file (0); | |
272 | if (exec_file == 0) | |
273 | exec_file = ""; | |
a3f17187 | 274 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
275 | target_pid_to_str (pid_to_ptid (pid))); |
276 | gdb_flush (gdb_stdout); | |
277 | } | |
278 | if (args) | |
6e1e94ea | 279 | sig = atoi (args); |
5bf970f9 | 280 | |
6e1e94ea | 281 | #ifdef PT_DETACH |
4b8a1a28 | 282 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 283 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
284 | previously attached to the inferior. It *might* work if we |
285 | started the process ourselves. */ | |
6e1e94ea | 286 | errno = 0; |
4b8a1a28 | 287 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 288 | if (errno != 0) |
e2e0b3e5 | 289 | perror_with_name (("ptrace")); |
6e1e94ea | 290 | #else |
8a3fe4f8 | 291 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 292 | #endif |
5bf970f9 AC |
293 | |
294 | inferior_ptid = null_ptid; | |
7f9f62ba | 295 | detach_inferior (pid); |
7a7d3353 | 296 | |
6a3cb8e8 | 297 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
298 | } |
299 | ||
4b8a1a28 MK |
300 | /* Kill the inferior. */ |
301 | ||
5bf970f9 | 302 | static void |
7d85a9c0 | 303 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 304 | { |
4b8a1a28 | 305 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 306 | int status; |
c7c14b96 MK |
307 | |
308 | if (pid == 0) | |
309 | return; | |
310 | ||
4b8a1a28 MK |
311 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
312 | waitpid (pid, &status, 0); | |
313 | ||
c7c14b96 | 314 | target_mourn_inferior (); |
5bf970f9 AC |
315 | } |
316 | ||
4b8a1a28 | 317 | /* Stop the inferior. */ |
c7c14b96 | 318 | |
5bf970f9 | 319 | static void |
1eab8a48 | 320 | inf_ptrace_stop (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 321 | { |
4b8a1a28 MK |
322 | /* Send a SIGINT to the process group. This acts just like the user |
323 | typed a ^C on the controlling terminal. Note that using a | |
324 | negative process number in kill() is a System V-ism. The proper | |
325 | BSD interface is killpg(). However, all modern BSDs support the | |
326 | System V interface too. */ | |
7e1789f5 | 327 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
328 | } |
329 | ||
4b8a1a28 MK |
330 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
331 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
332 | that signal. */ | |
5bf970f9 AC |
333 | |
334 | static void | |
28439f5e | 335 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 336 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 337 | { |
4b8a1a28 | 338 | pid_t pid = ptid_get_pid (ptid); |
a96d9b2e | 339 | int request; |
c7c14b96 MK |
340 | |
341 | if (pid == -1) | |
4b8a1a28 MK |
342 | /* Resume all threads. Traditionally ptrace() only supports |
343 | single-threaded processes, so simply resume the inferior. */ | |
344 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 | 345 | |
a96d9b2e SDJ |
346 | if (catch_syscall_enabled () > 0) |
347 | request = PT_SYSCALL; | |
348 | else | |
349 | request = PT_CONTINUE; | |
350 | ||
c7c14b96 MK |
351 | if (step) |
352 | { | |
353 | /* If this system does not support PT_STEP, a higher level | |
354 | function will have called single_step() to transmute the step | |
355 | request into a continue request (by setting breakpoints on | |
356 | all possible successor instructions), so we don't have to | |
357 | worry about that here. */ | |
358 | request = PT_STEP; | |
359 | } | |
360 | ||
361 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
362 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 363 | already written a new program counter value to the child. */ |
c7c14b96 | 364 | errno = 0; |
2ea28649 | 365 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
366 | if (errno != 0) |
367 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
368 | } |
369 | ||
4b8a1a28 MK |
370 | /* Wait for the child specified by PTID to do something. Return the |
371 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
372 | the status in *OURSTATUS. */ | |
5bf970f9 | 373 | |
c7c14b96 | 374 | static ptid_t |
117de6a9 | 375 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 376 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 377 | { |
4b8a1a28 MK |
378 | pid_t pid; |
379 | int status, save_errno; | |
5bf970f9 | 380 | |
c7c14b96 MK |
381 | do |
382 | { | |
4b8a1a28 | 383 | set_sigint_trap (); |
5bf970f9 | 384 | |
4b8a1a28 MK |
385 | do |
386 | { | |
387 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
388 | save_errno = errno; | |
389 | } | |
390 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 391 | |
c7c14b96 | 392 | clear_sigint_trap (); |
5bf970f9 | 393 | |
c7c14b96 MK |
394 | if (pid == -1) |
395 | { | |
c7c14b96 | 396 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 397 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
398 | safe_strerror (save_errno)); |
399 | ||
400 | /* Claim it exited with unknown signal. */ | |
401 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 402 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 403 | return inferior_ptid; |
c7c14b96 MK |
404 | } |
405 | ||
4b8a1a28 MK |
406 | /* Ignore terminated detached child processes. */ |
407 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
408 | pid = -1; | |
c7c14b96 | 409 | } |
4b8a1a28 | 410 | while (pid == -1); |
c7c14b96 | 411 | |
735f54b4 MK |
412 | #ifdef PT_GET_PROCESS_STATE |
413 | if (WIFSTOPPED (status)) | |
414 | { | |
415 | ptrace_state_t pe; | |
416 | pid_t fpid; | |
417 | ||
418 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
419 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
420 | perror_with_name (("ptrace")); | |
421 | ||
422 | switch (pe.pe_report_event) | |
423 | { | |
424 | case PTRACE_FORK: | |
425 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 426 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
427 | |
428 | /* Make sure the other end of the fork is stopped too. */ | |
429 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
430 | if (fpid == -1) | |
431 | perror_with_name (("waitpid")); | |
432 | ||
433 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
434 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
435 | perror_with_name (("ptrace")); | |
436 | ||
437 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
438 | gdb_assert (pe.pe_other_pid == pid); | |
439 | if (fpid == ptid_get_pid (inferior_ptid)) | |
440 | { | |
3a3e9ee3 | 441 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
442 | return pid_to_ptid (fpid); |
443 | } | |
444 | ||
445 | return pid_to_ptid (pid); | |
446 | } | |
447 | } | |
448 | #endif | |
449 | ||
c7c14b96 MK |
450 | store_waitstatus (ourstatus, status); |
451 | return pid_to_ptid (pid); | |
5bf970f9 AC |
452 | } |
453 | ||
edcc890f | 454 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 455 | |
9b409511 | 456 | static enum target_xfer_status |
5bf970f9 | 457 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
458 | const char *annex, gdb_byte *readbuf, |
459 | const gdb_byte *writebuf, | |
9b409511 | 460 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 461 | { |
4b8a1a28 MK |
462 | pid_t pid = ptid_get_pid (inferior_ptid); |
463 | ||
5bf970f9 AC |
464 | switch (object) |
465 | { | |
466 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
467 | #ifdef PT_IO |
468 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
469 | request that promises to be much more efficient in reading | |
470 | and writing data in the traced process's address space. */ | |
471 | { | |
472 | struct ptrace_io_desc piod; | |
4b8a1a28 | 473 | |
f929a579 | 474 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
475 | for instruction and data. However, on OpenBSD 3.9 and |
476 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
477 | mapped read-only. Since most code segments will be | |
478 | read-only, using PIOD_WRITE_D will prevent us from | |
479 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
480 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
481 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
482 | piod.piod_offs = (void *) (long) offset; | |
483 | piod.piod_len = len; | |
484 | ||
485 | errno = 0; | |
4b8a1a28 | 486 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 487 | { |
9b409511 | 488 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
489 | *xfered_len = piod.piod_len; |
490 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 491 | } |
f929a579 AC |
492 | /* If the PT_IO request is somehow not supported, fallback on |
493 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
494 | to indicate failure. */ | |
495 | if (errno != EINVAL) | |
9b409511 | 496 | return TARGET_XFER_EOF; |
f929a579 AC |
497 | } |
498 | #endif | |
499 | { | |
500 | union | |
501 | { | |
502 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 503 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
504 | } buffer; |
505 | ULONGEST rounded_offset; | |
9b409511 | 506 | ULONGEST partial_len; |
4b8a1a28 | 507 | |
cb85a953 AC |
508 | /* Round the start offset down to the next long word |
509 | boundary. */ | |
f929a579 | 510 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 511 | |
cb85a953 AC |
512 | /* Since ptrace will transfer a single word starting at that |
513 | rounded_offset the partial_len needs to be adjusted down to | |
514 | that (remember this function only does a single transfer). | |
515 | Should the required length be even less, adjust it down | |
516 | again. */ | |
517 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
518 | if (partial_len > len) | |
f929a579 | 519 | partial_len = len; |
4b8a1a28 | 520 | |
f929a579 AC |
521 | if (writebuf) |
522 | { | |
cb85a953 AC |
523 | /* If OFFSET:PARTIAL_LEN is smaller than |
524 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
525 | be needed. Read in the entire word. */ | |
f929a579 | 526 | if (rounded_offset < offset |
cb85a953 AC |
527 | || (offset + partial_len |
528 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 529 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 530 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
531 | (PTRACE_TYPE_ARG3)(uintptr_t) |
532 | rounded_offset, 0); | |
4b8a1a28 | 533 | |
f929a579 AC |
534 | /* Copy data to be written over corresponding part of |
535 | buffer. */ | |
f6ffd89b MK |
536 | memcpy (buffer.byte + (offset - rounded_offset), |
537 | writebuf, partial_len); | |
4b8a1a28 | 538 | |
f929a579 | 539 | errno = 0; |
4b8a1a28 | 540 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
541 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
542 | buffer.word); | |
f929a579 AC |
543 | if (errno) |
544 | { | |
545 | /* Using the appropriate one (I or D) is necessary for | |
546 | Gould NP1, at least. */ | |
547 | errno = 0; | |
4b8a1a28 | 548 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
549 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
550 | buffer.word); | |
f929a579 | 551 | if (errno) |
9b409511 | 552 | return TARGET_XFER_EOF; |
f929a579 AC |
553 | } |
554 | } | |
4b8a1a28 | 555 | |
f929a579 AC |
556 | if (readbuf) |
557 | { | |
558 | errno = 0; | |
4b8a1a28 | 559 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
560 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
561 | 0); | |
f929a579 | 562 | if (errno) |
9b409511 | 563 | return TARGET_XFER_EOF; |
f929a579 AC |
564 | /* Copy appropriate bytes out of the buffer. */ |
565 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
566 | partial_len); | |
567 | } | |
4b8a1a28 | 568 | |
9b409511 YQ |
569 | *xfered_len = partial_len; |
570 | return TARGET_XFER_OK; | |
f929a579 | 571 | } |
5bf970f9 AC |
572 | |
573 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 574 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
575 | |
576 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
577 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
578 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
579 | request that allows us to read the auxilliary vector. Other | |
580 | BSD's may follow if they feel the need to support PIE. */ | |
581 | { | |
582 | struct ptrace_io_desc piod; | |
583 | ||
584 | if (writebuf) | |
2ed4b548 | 585 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
586 | piod.piod_op = PIOD_READ_AUXV; |
587 | piod.piod_addr = readbuf; | |
588 | piod.piod_offs = (void *) (long) offset; | |
589 | piod.piod_len = len; | |
590 | ||
591 | errno = 0; | |
592 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 593 | { |
9b409511 | 594 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
595 | *xfered_len = piod.piod_len; |
596 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 597 | } |
e8ace1c0 MK |
598 | } |
599 | #endif | |
2ed4b548 | 600 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
601 | |
602 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 603 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
604 | |
605 | default: | |
2ed4b548 | 606 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
607 | } |
608 | } | |
609 | ||
4b8a1a28 | 610 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
611 | |
612 | static int | |
28439f5e | 613 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 614 | { |
4b8a1a28 MK |
615 | /* ??? Is kill the right way to do this? */ |
616 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
617 | } |
618 | ||
619 | /* Print status information about what we're accessing. */ | |
620 | ||
621 | static void | |
622 | inf_ptrace_files_info (struct target_ops *ignore) | |
623 | { | |
181e7f93 PA |
624 | struct inferior *inf = current_inferior (); |
625 | ||
4b8a1a28 | 626 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 627 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 628 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
629 | } |
630 | ||
117de6a9 PA |
631 | static char * |
632 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
633 | { | |
634 | return normal_pid_to_str (ptid); | |
635 | } | |
636 | ||
e8ace1c0 MK |
637 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
638 | ||
639 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
640 | Return 0 if *READPTR is already at the end of the buffer. | |
641 | Return -1 if there is insufficient buffer for a whole entry. | |
642 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
643 | ||
644 | static int | |
645 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
646 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
647 | { | |
f5656ead TT |
648 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
649 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
650 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
651 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 652 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
653 | gdb_byte *ptr = *readptr; |
654 | ||
655 | if (endptr == ptr) | |
656 | return 0; | |
657 | ||
658 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
659 | return -1; | |
660 | ||
661 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
662 | ptr += sizeof_auxv_val; /* Alignment. */ | |
663 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
664 | ptr += sizeof_auxv_val; | |
665 | ||
666 | *readptr = ptr; | |
667 | return 1; | |
668 | } | |
669 | ||
670 | #endif | |
671 | ||
8785ced0 MK |
672 | /* Create a prototype ptrace target. The client can override it with |
673 | local methods. */ | |
674 | ||
5bf970f9 AC |
675 | struct target_ops * |
676 | inf_ptrace_target (void) | |
677 | { | |
678 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 679 | |
5bf970f9 | 680 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
681 | t->to_detach = inf_ptrace_detach; |
682 | t->to_resume = inf_ptrace_resume; | |
683 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 684 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 685 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 686 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
687 | #ifdef PT_GET_PROCESS_STATE |
688 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
689 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
690 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 691 | #endif |
5bf970f9 | 692 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 693 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 694 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 695 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 696 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
697 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
698 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
699 | #endif | |
8785ced0 MK |
700 | |
701 | return t; | |
702 | } | |
703 | \f | |
704 | ||
4b8a1a28 | 705 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 706 | where a particular register is stored. */ |
7714d83a | 707 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
708 | |
709 | /* Fetch register REGNUM from the inferior. */ | |
710 | ||
711 | static void | |
56be3814 | 712 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 713 | { |
3b3b1423 | 714 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
715 | CORE_ADDR addr; |
716 | size_t size; | |
717 | PTRACE_TYPE_RET *buf; | |
718 | int pid, i; | |
719 | ||
7714d83a | 720 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 721 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 722 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 723 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 724 | { |
56be3814 | 725 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
726 | return; |
727 | } | |
728 | ||
8785ced0 | 729 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 730 | separate processes. */ |
8785ced0 MK |
731 | pid = ptid_get_lwp (inferior_ptid); |
732 | if (pid == 0) | |
733 | pid = ptid_get_pid (inferior_ptid); | |
734 | ||
3b3b1423 | 735 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
736 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
737 | buf = alloca (size); | |
738 | ||
10d6c8cd | 739 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
740 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
741 | { | |
742 | errno = 0; | |
f7dd0ed7 | 743 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 744 | if (errno != 0) |
4b8a1a28 | 745 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 746 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 747 | regnum, safe_strerror (errno)); |
8785ced0 MK |
748 | |
749 | addr += sizeof (PTRACE_TYPE_RET); | |
750 | } | |
56be3814 | 751 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
752 | } |
753 | ||
754 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
755 | for all registers. */ | |
756 | ||
757 | static void | |
28439f5e PA |
758 | inf_ptrace_fetch_registers (struct target_ops *ops, |
759 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
760 | { |
761 | if (regnum == -1) | |
3b3b1423 UW |
762 | for (regnum = 0; |
763 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
764 | regnum++) | |
56be3814 | 765 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 766 | else |
56be3814 | 767 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
768 | } |
769 | ||
770 | /* Store register REGNUM into the inferior. */ | |
771 | ||
772 | static void | |
56be3814 | 773 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 774 | { |
3b3b1423 | 775 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
776 | CORE_ADDR addr; |
777 | size_t size; | |
778 | PTRACE_TYPE_RET *buf; | |
779 | int pid, i; | |
780 | ||
7714d83a | 781 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 782 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 783 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 784 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
785 | return; |
786 | ||
8785ced0 | 787 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 788 | separate processes. */ |
8785ced0 MK |
789 | pid = ptid_get_lwp (inferior_ptid); |
790 | if (pid == 0) | |
791 | pid = ptid_get_pid (inferior_ptid); | |
792 | ||
3b3b1423 | 793 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
794 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
795 | buf = alloca (size); | |
796 | ||
10d6c8cd | 797 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 798 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
799 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
800 | { | |
801 | errno = 0; | |
f7dd0ed7 | 802 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 803 | if (errno != 0) |
4b8a1a28 | 804 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 805 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 806 | regnum, safe_strerror (errno)); |
8785ced0 MK |
807 | |
808 | addr += sizeof (PTRACE_TYPE_RET); | |
809 | } | |
810 | } | |
811 | ||
812 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
813 | this for all registers. */ | |
814 | ||
2c0b251b | 815 | static void |
28439f5e PA |
816 | inf_ptrace_store_registers (struct target_ops *ops, |
817 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
818 | { |
819 | if (regnum == -1) | |
3b3b1423 UW |
820 | for (regnum = 0; |
821 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
822 | regnum++) | |
56be3814 | 823 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 824 | else |
56be3814 | 825 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
826 | } |
827 | ||
828 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
829 | a function returning the offset within the user area where a | |
830 | particular register is stored. */ | |
831 | ||
832 | struct target_ops * | |
7714d83a UW |
833 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
834 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
835 | { |
836 | struct target_ops *t = inf_ptrace_target(); | |
837 | ||
838 | gdb_assert (register_u_offset); | |
839 | inf_ptrace_register_u_offset = register_u_offset; | |
840 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
841 | t->to_store_registers = inf_ptrace_store_registers; | |
842 | ||
5bf970f9 AC |
843 | return t; |
844 | } |