Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
32d0add0 | 3 | Copyright (C) 1988-2015 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 | ||
d83ad864 DB |
39 | /* Target hook for follow_fork. On entry and at return inferior_ptid is |
40 | the ptid of the followed inferior. */ | |
41 | ||
735f54b4 | 42 | static int |
07107ca6 LM |
43 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child, |
44 | int detach_fork) | |
735f54b4 | 45 | { |
d83ad864 | 46 | if (!follow_child) |
735f54b4 | 47 | { |
ebf3aa72 MK |
48 | struct thread_info *tp = inferior_thread (); |
49 | pid_t child_pid = ptid_get_pid (tp->pending_follow.value.related_pid); | |
191c4426 | 50 | |
b242c3c2 PA |
51 | /* Breakpoints have already been detached from the child by |
52 | infrun.c. */ | |
735f54b4 | 53 | |
d83ad864 | 54 | if (ptrace (PT_DETACH, child_pid, (PTRACE_TYPE_ARG3)1, 0) == -1) |
735f54b4 MK |
55 | perror_with_name (("ptrace")); |
56 | } | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | #endif /* PT_GET_PROCESS_STATE */ | |
62 | \f | |
63 | ||
4b8a1a28 | 64 | /* Prepare to be traced. */ |
5bf970f9 AC |
65 | |
66 | static void | |
c7c14b96 | 67 | inf_ptrace_me (void) |
5bf970f9 | 68 | { |
c7c14b96 | 69 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 70 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
71 | } |
72 | ||
136d6dae VP |
73 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
74 | run, ALLARGS is a string containing the arguments to the program. | |
75 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
76 | chatty about it. */ | |
5bf970f9 AC |
77 | |
78 | static void | |
136d6dae VP |
79 | inf_ptrace_create_inferior (struct target_ops *ops, |
80 | char *exec_file, char *allargs, char **env, | |
81 | int from_tty) | |
5bf970f9 | 82 | { |
136d6dae VP |
83 | int pid; |
84 | ||
c0edd9ed JK |
85 | /* Do not change either targets above or the same target if already present. |
86 | The reason is the target stack is shared across multiple inferiors. */ | |
87 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 88 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed JK |
89 | |
90 | if (! ops_already_pushed) | |
91 | { | |
92 | /* Clear possible core file with its process_stratum. */ | |
93 | push_target (ops); | |
25f43500 | 94 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
95 | } |
96 | ||
136d6dae | 97 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 98 | NULL, NULL, NULL); |
136d6dae | 99 | |
25f43500 | 100 | discard_cleanups (back_to); |
5bf970f9 | 101 | |
c7c14b96 MK |
102 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
103 | ||
104 | /* On some targets, there must be some explicit actions taken after | |
105 | the inferior has been started up. */ | |
106 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
107 | } |
108 | ||
e4ef629d MK |
109 | #ifdef PT_GET_PROCESS_STATE |
110 | ||
111 | static void | |
2e97a79e | 112 | inf_ptrace_post_startup_inferior (struct target_ops *self, ptid_t pid) |
e4ef629d MK |
113 | { |
114 | ptrace_event_t pe; | |
115 | ||
116 | /* Set the initial event mask. */ | |
117 | memset (&pe, 0, sizeof pe); | |
118 | pe.pe_set_event |= PTRACE_FORK; | |
119 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
120 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
121 | perror_with_name (("ptrace")); | |
122 | } | |
123 | ||
124 | #endif | |
125 | ||
4b8a1a28 MK |
126 | /* Clean up a rotting corpse of an inferior after it died. */ |
127 | ||
c7c14b96 | 128 | static void |
136d6dae | 129 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 130 | { |
4b8a1a28 MK |
131 | int status; |
132 | ||
133 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 134 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 135 | dealing with a process that we attached to. Such a process will |
3d450bdd | 136 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
137 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
138 | ||
c1ee2fb3 | 139 | inf_child_mourn_inferior (ops); |
5bf970f9 AC |
140 | } |
141 | ||
4b8a1a28 MK |
142 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
143 | be chatty about it. */ | |
5bf970f9 AC |
144 | |
145 | static void | |
c0939df1 | 146 | inf_ptrace_attach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 AC |
147 | { |
148 | char *exec_file; | |
4b8a1a28 | 149 | pid_t pid; |
181e7f93 | 150 | struct inferior *inf; |
5bf970f9 | 151 | |
c0edd9ed JK |
152 | /* Do not change either targets above or the same target if already present. |
153 | The reason is the target stack is shared across multiple inferiors. */ | |
154 | int ops_already_pushed = target_is_pushed (ops); | |
25f43500 | 155 | struct cleanup *back_to = make_cleanup (null_cleanup, NULL); |
c0edd9ed | 156 | |
74164c56 | 157 | pid = parse_pid_to_attach (args); |
5bf970f9 | 158 | |
f6ffd89b | 159 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 160 | error (_("I refuse to debug myself!")); |
5bf970f9 | 161 | |
c0edd9ed JK |
162 | if (! ops_already_pushed) |
163 | { | |
164 | /* target_pid_to_str already uses the target. Also clear possible core | |
165 | file with its process_stratum. */ | |
166 | push_target (ops); | |
25f43500 | 167 | make_cleanup_unpush_target (ops); |
c0edd9ed JK |
168 | } |
169 | ||
5bf970f9 AC |
170 | if (from_tty) |
171 | { | |
4b8a1a28 | 172 | exec_file = get_exec_file (0); |
5bf970f9 AC |
173 | |
174 | if (exec_file) | |
a3f17187 | 175 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
176 | target_pid_to_str (pid_to_ptid (pid))); |
177 | else | |
a3f17187 | 178 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
179 | target_pid_to_str (pid_to_ptid (pid))); |
180 | ||
181 | gdb_flush (gdb_stdout); | |
182 | } | |
183 | ||
6e1e94ea MK |
184 | #ifdef PT_ATTACH |
185 | errno = 0; | |
4b8a1a28 | 186 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 187 | if (errno != 0) |
e2e0b3e5 | 188 | perror_with_name (("ptrace")); |
6e1e94ea | 189 | #else |
8a3fe4f8 | 190 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 191 | #endif |
5bf970f9 | 192 | |
6c95b8df PA |
193 | inf = current_inferior (); |
194 | inferior_appeared (inf, pid); | |
181e7f93 | 195 | inf->attach_flag = 1; |
6c95b8df | 196 | inferior_ptid = pid_to_ptid (pid); |
7f9f62ba | 197 | |
af990527 PA |
198 | /* Always add a main thread. If some target extends the ptrace |
199 | target, it should decorate the ptid later with more info. */ | |
200 | add_thread_silent (inferior_ptid); | |
201 | ||
25f43500 | 202 | discard_cleanups (back_to); |
5bf970f9 AC |
203 | } |
204 | ||
e4ef629d MK |
205 | #ifdef PT_GET_PROCESS_STATE |
206 | ||
460fac3c | 207 | static void |
f045800c | 208 | inf_ptrace_post_attach (struct target_ops *self, int pid) |
e4ef629d MK |
209 | { |
210 | ptrace_event_t pe; | |
211 | ||
212 | /* Set the initial event mask. */ | |
213 | memset (&pe, 0, sizeof pe); | |
214 | pe.pe_set_event |= PTRACE_FORK; | |
215 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
216 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
217 | perror_with_name (("ptrace")); | |
218 | } | |
219 | ||
220 | #endif | |
221 | ||
4b8a1a28 | 222 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 223 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
224 | |
225 | static void | |
52554a0e | 226 | inf_ptrace_detach (struct target_ops *ops, const char *args, int from_tty) |
5bf970f9 | 227 | { |
4b8a1a28 | 228 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 229 | int sig = 0; |
5bf970f9 AC |
230 | |
231 | if (from_tty) | |
232 | { | |
233 | char *exec_file = get_exec_file (0); | |
234 | if (exec_file == 0) | |
235 | exec_file = ""; | |
a3f17187 | 236 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
237 | target_pid_to_str (pid_to_ptid (pid))); |
238 | gdb_flush (gdb_stdout); | |
239 | } | |
240 | if (args) | |
6e1e94ea | 241 | sig = atoi (args); |
5bf970f9 | 242 | |
6e1e94ea | 243 | #ifdef PT_DETACH |
4b8a1a28 | 244 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 245 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
246 | previously attached to the inferior. It *might* work if we |
247 | started the process ourselves. */ | |
6e1e94ea | 248 | errno = 0; |
4b8a1a28 | 249 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 250 | if (errno != 0) |
e2e0b3e5 | 251 | perror_with_name (("ptrace")); |
6e1e94ea | 252 | #else |
8a3fe4f8 | 253 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 254 | #endif |
5bf970f9 AC |
255 | |
256 | inferior_ptid = null_ptid; | |
7f9f62ba | 257 | detach_inferior (pid); |
7a7d3353 | 258 | |
6a3cb8e8 | 259 | inf_child_maybe_unpush_target (ops); |
5bf970f9 AC |
260 | } |
261 | ||
4b8a1a28 MK |
262 | /* Kill the inferior. */ |
263 | ||
5bf970f9 | 264 | static void |
7d85a9c0 | 265 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 266 | { |
4b8a1a28 | 267 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 268 | int status; |
c7c14b96 MK |
269 | |
270 | if (pid == 0) | |
271 | return; | |
272 | ||
4b8a1a28 MK |
273 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
274 | waitpid (pid, &status, 0); | |
275 | ||
c7c14b96 | 276 | target_mourn_inferior (); |
5bf970f9 AC |
277 | } |
278 | ||
4b8a1a28 | 279 | /* Stop the inferior. */ |
c7c14b96 | 280 | |
5bf970f9 | 281 | static void |
1eab8a48 | 282 | inf_ptrace_stop (struct target_ops *self, ptid_t ptid) |
5bf970f9 | 283 | { |
4b8a1a28 MK |
284 | /* Send a SIGINT to the process group. This acts just like the user |
285 | typed a ^C on the controlling terminal. Note that using a | |
286 | negative process number in kill() is a System V-ism. The proper | |
287 | BSD interface is killpg(). However, all modern BSDs support the | |
288 | System V interface too. */ | |
7e1789f5 | 289 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
290 | } |
291 | ||
4b8a1a28 MK |
292 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
293 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
294 | that signal. */ | |
5bf970f9 AC |
295 | |
296 | static void | |
28439f5e | 297 | inf_ptrace_resume (struct target_ops *ops, |
2ea28649 | 298 | ptid_t ptid, int step, enum gdb_signal signal) |
5bf970f9 | 299 | { |
4b8a1a28 | 300 | pid_t pid = ptid_get_pid (ptid); |
a96d9b2e | 301 | int request; |
c7c14b96 MK |
302 | |
303 | if (pid == -1) | |
4b8a1a28 MK |
304 | /* Resume all threads. Traditionally ptrace() only supports |
305 | single-threaded processes, so simply resume the inferior. */ | |
306 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 | 307 | |
a96d9b2e SDJ |
308 | if (catch_syscall_enabled () > 0) |
309 | request = PT_SYSCALL; | |
310 | else | |
311 | request = PT_CONTINUE; | |
312 | ||
c7c14b96 MK |
313 | if (step) |
314 | { | |
315 | /* If this system does not support PT_STEP, a higher level | |
316 | function will have called single_step() to transmute the step | |
317 | request into a continue request (by setting breakpoints on | |
318 | all possible successor instructions), so we don't have to | |
319 | worry about that here. */ | |
320 | request = PT_STEP; | |
321 | } | |
322 | ||
323 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
324 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 325 | already written a new program counter value to the child. */ |
c7c14b96 | 326 | errno = 0; |
2ea28649 | 327 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
328 | if (errno != 0) |
329 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
330 | } |
331 | ||
4b8a1a28 MK |
332 | /* Wait for the child specified by PTID to do something. Return the |
333 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
334 | the status in *OURSTATUS. */ | |
5bf970f9 | 335 | |
c7c14b96 | 336 | static ptid_t |
117de6a9 | 337 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 338 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 339 | { |
4b8a1a28 MK |
340 | pid_t pid; |
341 | int status, save_errno; | |
5bf970f9 | 342 | |
c7c14b96 MK |
343 | do |
344 | { | |
4b8a1a28 | 345 | set_sigint_trap (); |
5bf970f9 | 346 | |
4b8a1a28 MK |
347 | do |
348 | { | |
349 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
350 | save_errno = errno; | |
351 | } | |
352 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 353 | |
c7c14b96 | 354 | clear_sigint_trap (); |
5bf970f9 | 355 | |
c7c14b96 MK |
356 | if (pid == -1) |
357 | { | |
c7c14b96 | 358 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 359 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
360 | safe_strerror (save_errno)); |
361 | ||
362 | /* Claim it exited with unknown signal. */ | |
363 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 364 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 365 | return inferior_ptid; |
c7c14b96 MK |
366 | } |
367 | ||
4b8a1a28 MK |
368 | /* Ignore terminated detached child processes. */ |
369 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
370 | pid = -1; | |
c7c14b96 | 371 | } |
4b8a1a28 | 372 | while (pid == -1); |
c7c14b96 | 373 | |
735f54b4 MK |
374 | #ifdef PT_GET_PROCESS_STATE |
375 | if (WIFSTOPPED (status)) | |
376 | { | |
377 | ptrace_state_t pe; | |
378 | pid_t fpid; | |
379 | ||
380 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
381 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
382 | perror_with_name (("ptrace")); | |
383 | ||
384 | switch (pe.pe_report_event) | |
385 | { | |
386 | case PTRACE_FORK: | |
387 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 388 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
389 | |
390 | /* Make sure the other end of the fork is stopped too. */ | |
391 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
392 | if (fpid == -1) | |
393 | perror_with_name (("waitpid")); | |
394 | ||
395 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
396 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
397 | perror_with_name (("ptrace")); | |
398 | ||
399 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
400 | gdb_assert (pe.pe_other_pid == pid); | |
401 | if (fpid == ptid_get_pid (inferior_ptid)) | |
402 | { | |
3a3e9ee3 | 403 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
404 | return pid_to_ptid (fpid); |
405 | } | |
406 | ||
407 | return pid_to_ptid (pid); | |
408 | } | |
409 | } | |
410 | #endif | |
411 | ||
c7c14b96 MK |
412 | store_waitstatus (ourstatus, status); |
413 | return pid_to_ptid (pid); | |
5bf970f9 AC |
414 | } |
415 | ||
edcc890f | 416 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 417 | |
9b409511 | 418 | static enum target_xfer_status |
5bf970f9 | 419 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
961cb7b5 MK |
420 | const char *annex, gdb_byte *readbuf, |
421 | const gdb_byte *writebuf, | |
9b409511 | 422 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
5bf970f9 | 423 | { |
4b8a1a28 MK |
424 | pid_t pid = ptid_get_pid (inferior_ptid); |
425 | ||
5bf970f9 AC |
426 | switch (object) |
427 | { | |
428 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
429 | #ifdef PT_IO |
430 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
431 | request that promises to be much more efficient in reading | |
432 | and writing data in the traced process's address space. */ | |
433 | { | |
434 | struct ptrace_io_desc piod; | |
4b8a1a28 | 435 | |
f929a579 | 436 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
437 | for instruction and data. However, on OpenBSD 3.9 and |
438 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
439 | mapped read-only. Since most code segments will be | |
440 | read-only, using PIOD_WRITE_D will prevent us from | |
441 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
442 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
443 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
444 | piod.piod_offs = (void *) (long) offset; | |
445 | piod.piod_len = len; | |
446 | ||
447 | errno = 0; | |
4b8a1a28 | 448 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
9b409511 | 449 | { |
9b409511 | 450 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
451 | *xfered_len = piod.piod_len; |
452 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 453 | } |
f929a579 AC |
454 | /* If the PT_IO request is somehow not supported, fallback on |
455 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
456 | to indicate failure. */ | |
457 | if (errno != EINVAL) | |
9b409511 | 458 | return TARGET_XFER_EOF; |
f929a579 AC |
459 | } |
460 | #endif | |
461 | { | |
462 | union | |
463 | { | |
464 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 465 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
466 | } buffer; |
467 | ULONGEST rounded_offset; | |
9b409511 | 468 | ULONGEST partial_len; |
4b8a1a28 | 469 | |
cb85a953 AC |
470 | /* Round the start offset down to the next long word |
471 | boundary. */ | |
f929a579 | 472 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 473 | |
cb85a953 AC |
474 | /* Since ptrace will transfer a single word starting at that |
475 | rounded_offset the partial_len needs to be adjusted down to | |
476 | that (remember this function only does a single transfer). | |
477 | Should the required length be even less, adjust it down | |
478 | again. */ | |
479 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
480 | if (partial_len > len) | |
f929a579 | 481 | partial_len = len; |
4b8a1a28 | 482 | |
f929a579 AC |
483 | if (writebuf) |
484 | { | |
cb85a953 AC |
485 | /* If OFFSET:PARTIAL_LEN is smaller than |
486 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
487 | be needed. Read in the entire word. */ | |
f929a579 | 488 | if (rounded_offset < offset |
cb85a953 AC |
489 | || (offset + partial_len |
490 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 491 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 492 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
493 | (PTRACE_TYPE_ARG3)(uintptr_t) |
494 | rounded_offset, 0); | |
4b8a1a28 | 495 | |
f929a579 AC |
496 | /* Copy data to be written over corresponding part of |
497 | buffer. */ | |
f6ffd89b MK |
498 | memcpy (buffer.byte + (offset - rounded_offset), |
499 | writebuf, partial_len); | |
4b8a1a28 | 500 | |
f929a579 | 501 | errno = 0; |
4b8a1a28 | 502 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
503 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
504 | buffer.word); | |
f929a579 AC |
505 | if (errno) |
506 | { | |
507 | /* Using the appropriate one (I or D) is necessary for | |
508 | Gould NP1, at least. */ | |
509 | errno = 0; | |
4b8a1a28 | 510 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
511 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
512 | buffer.word); | |
f929a579 | 513 | if (errno) |
9b409511 | 514 | return TARGET_XFER_EOF; |
f929a579 AC |
515 | } |
516 | } | |
4b8a1a28 | 517 | |
f929a579 AC |
518 | if (readbuf) |
519 | { | |
520 | errno = 0; | |
4b8a1a28 | 521 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
522 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
523 | 0); | |
f929a579 | 524 | if (errno) |
9b409511 | 525 | return TARGET_XFER_EOF; |
f929a579 AC |
526 | /* Copy appropriate bytes out of the buffer. */ |
527 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
528 | partial_len); | |
529 | } | |
4b8a1a28 | 530 | |
9b409511 YQ |
531 | *xfered_len = partial_len; |
532 | return TARGET_XFER_OK; | |
f929a579 | 533 | } |
5bf970f9 AC |
534 | |
535 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 536 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
537 | |
538 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
539 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
540 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
541 | request that allows us to read the auxilliary vector. Other | |
542 | BSD's may follow if they feel the need to support PIE. */ | |
543 | { | |
544 | struct ptrace_io_desc piod; | |
545 | ||
546 | if (writebuf) | |
2ed4b548 | 547 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
548 | piod.piod_op = PIOD_READ_AUXV; |
549 | piod.piod_addr = readbuf; | |
550 | piod.piod_offs = (void *) (long) offset; | |
551 | piod.piod_len = len; | |
552 | ||
553 | errno = 0; | |
554 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) | |
9b409511 | 555 | { |
9b409511 | 556 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
557 | *xfered_len = piod.piod_len; |
558 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 559 | } |
e8ace1c0 MK |
560 | } |
561 | #endif | |
2ed4b548 | 562 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
563 | |
564 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 565 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
566 | |
567 | default: | |
2ed4b548 | 568 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
569 | } |
570 | } | |
571 | ||
4b8a1a28 | 572 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
573 | |
574 | static int | |
28439f5e | 575 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 576 | { |
4b8a1a28 MK |
577 | /* ??? Is kill the right way to do this? */ |
578 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
579 | } |
580 | ||
581 | /* Print status information about what we're accessing. */ | |
582 | ||
583 | static void | |
584 | inf_ptrace_files_info (struct target_ops *ignore) | |
585 | { | |
181e7f93 PA |
586 | struct inferior *inf = current_inferior (); |
587 | ||
4b8a1a28 | 588 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 589 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 590 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
591 | } |
592 | ||
117de6a9 PA |
593 | static char * |
594 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
595 | { | |
596 | return normal_pid_to_str (ptid); | |
597 | } | |
598 | ||
e8ace1c0 MK |
599 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
600 | ||
601 | /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR. | |
602 | Return 0 if *READPTR is already at the end of the buffer. | |
603 | Return -1 if there is insufficient buffer for a whole entry. | |
604 | Return 1 if an entry was read into *TYPEP and *VALP. */ | |
605 | ||
606 | static int | |
607 | inf_ptrace_auxv_parse (struct target_ops *ops, gdb_byte **readptr, | |
608 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) | |
609 | { | |
f5656ead TT |
610 | struct type *int_type = builtin_type (target_gdbarch ())->builtin_int; |
611 | struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr; | |
e8ace1c0 MK |
612 | const int sizeof_auxv_type = TYPE_LENGTH (int_type); |
613 | const int sizeof_auxv_val = TYPE_LENGTH (ptr_type); | |
f5656ead | 614 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
e8ace1c0 MK |
615 | gdb_byte *ptr = *readptr; |
616 | ||
617 | if (endptr == ptr) | |
618 | return 0; | |
619 | ||
620 | if (endptr - ptr < 2 * sizeof_auxv_val) | |
621 | return -1; | |
622 | ||
623 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_type, byte_order); | |
624 | ptr += sizeof_auxv_val; /* Alignment. */ | |
625 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_val, byte_order); | |
626 | ptr += sizeof_auxv_val; | |
627 | ||
628 | *readptr = ptr; | |
629 | return 1; | |
630 | } | |
631 | ||
632 | #endif | |
633 | ||
8785ced0 MK |
634 | /* Create a prototype ptrace target. The client can override it with |
635 | local methods. */ | |
636 | ||
5bf970f9 AC |
637 | struct target_ops * |
638 | inf_ptrace_target (void) | |
639 | { | |
640 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 641 | |
5bf970f9 | 642 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
643 | t->to_detach = inf_ptrace_detach; |
644 | t->to_resume = inf_ptrace_resume; | |
645 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 646 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 647 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 648 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
649 | #ifdef PT_GET_PROCESS_STATE |
650 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
651 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
652 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 653 | #endif |
5bf970f9 | 654 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 655 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 656 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 657 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 658 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
e8ace1c0 MK |
659 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
660 | t->to_auxv_parse = inf_ptrace_auxv_parse; | |
661 | #endif | |
8785ced0 MK |
662 | |
663 | return t; | |
664 | } | |
665 | \f | |
666 | ||
4b8a1a28 | 667 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 668 | where a particular register is stored. */ |
7714d83a | 669 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
670 | |
671 | /* Fetch register REGNUM from the inferior. */ | |
672 | ||
673 | static void | |
56be3814 | 674 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 675 | { |
3b3b1423 | 676 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
677 | CORE_ADDR addr; |
678 | size_t size; | |
679 | PTRACE_TYPE_RET *buf; | |
680 | int pid, i; | |
681 | ||
7714d83a | 682 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 683 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 684 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 685 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 686 | { |
56be3814 | 687 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
688 | return; |
689 | } | |
690 | ||
8785ced0 | 691 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 692 | separate processes. */ |
8785ced0 MK |
693 | pid = ptid_get_lwp (inferior_ptid); |
694 | if (pid == 0) | |
695 | pid = ptid_get_pid (inferior_ptid); | |
696 | ||
3b3b1423 | 697 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
698 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
699 | buf = alloca (size); | |
700 | ||
10d6c8cd | 701 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
702 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
703 | { | |
704 | errno = 0; | |
f7dd0ed7 | 705 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 706 | if (errno != 0) |
4b8a1a28 | 707 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 708 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 709 | regnum, safe_strerror (errno)); |
8785ced0 MK |
710 | |
711 | addr += sizeof (PTRACE_TYPE_RET); | |
712 | } | |
56be3814 | 713 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
714 | } |
715 | ||
716 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
717 | for all registers. */ | |
718 | ||
719 | static void | |
28439f5e PA |
720 | inf_ptrace_fetch_registers (struct target_ops *ops, |
721 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
722 | { |
723 | if (regnum == -1) | |
3b3b1423 UW |
724 | for (regnum = 0; |
725 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
726 | regnum++) | |
56be3814 | 727 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 728 | else |
56be3814 | 729 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
730 | } |
731 | ||
732 | /* Store register REGNUM into the inferior. */ | |
733 | ||
734 | static void | |
56be3814 | 735 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 736 | { |
3b3b1423 | 737 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
738 | CORE_ADDR addr; |
739 | size_t size; | |
740 | PTRACE_TYPE_RET *buf; | |
741 | int pid, i; | |
742 | ||
7714d83a | 743 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 744 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 745 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 746 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
747 | return; |
748 | ||
8785ced0 | 749 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 750 | separate processes. */ |
8785ced0 MK |
751 | pid = ptid_get_lwp (inferior_ptid); |
752 | if (pid == 0) | |
753 | pid = ptid_get_pid (inferior_ptid); | |
754 | ||
3b3b1423 | 755 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
756 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
757 | buf = alloca (size); | |
758 | ||
10d6c8cd | 759 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 760 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
761 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
762 | { | |
763 | errno = 0; | |
f7dd0ed7 | 764 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 765 | if (errno != 0) |
4b8a1a28 | 766 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 767 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 768 | regnum, safe_strerror (errno)); |
8785ced0 MK |
769 | |
770 | addr += sizeof (PTRACE_TYPE_RET); | |
771 | } | |
772 | } | |
773 | ||
774 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
775 | this for all registers. */ | |
776 | ||
2c0b251b | 777 | static void |
28439f5e PA |
778 | inf_ptrace_store_registers (struct target_ops *ops, |
779 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
780 | { |
781 | if (regnum == -1) | |
3b3b1423 UW |
782 | for (regnum = 0; |
783 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
784 | regnum++) | |
56be3814 | 785 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 786 | else |
56be3814 | 787 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
788 | } |
789 | ||
790 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
791 | a function returning the offset within the user area where a | |
792 | particular register is stored. */ | |
793 | ||
794 | struct target_ops * | |
7714d83a UW |
795 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
796 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
797 | { |
798 | struct target_ops *t = inf_ptrace_target(); | |
799 | ||
800 | gdb_assert (register_u_offset); | |
801 | inf_ptrace_register_u_offset = register_u_offset; | |
802 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
803 | t->to_store_registers = inf_ptrace_store_registers; | |
804 | ||
5bf970f9 AC |
805 | return t; |
806 | } |