Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
b811d2c2 | 3 | Copyright (C) 1988-2020 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" |
e3790375 | 27 | #include "nat/gdb_ptrace.h" |
268a13a5 | 28 | #include "gdbsupport/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" |
2090129c SDJ |
34 | #include "nat/fork-inferior.h" |
35 | #include "utils.h" | |
0d12e84c | 36 | #include "gdbarch.h" |
2c4a536d | 37 | |
c7c14b96 MK |
38 | \f |
39 | ||
f09db380 KR |
40 | static PTRACE_TYPE_RET |
41 | gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr, | |
42 | PTRACE_TYPE_ARG4 data) | |
43 | { | |
44 | #ifdef __NetBSD__ | |
45 | return ptrace (request, ptid.pid (), addr, data); | |
46 | #else | |
47 | pid_t pid = get_ptrace_pid (ptid); | |
48 | return ptrace (request, pid, addr, data); | |
49 | #endif | |
50 | } | |
51 | ||
9ae79dac TT |
52 | /* A unique_ptr helper to unpush a target. */ |
53 | ||
54 | struct target_unpusher | |
55 | { | |
56 | void operator() (struct target_ops *ops) const | |
57 | { | |
58 | unpush_target (ops); | |
59 | } | |
60 | }; | |
61 | ||
62 | /* A unique_ptr that unpushes a target on destruction. */ | |
63 | ||
64 | typedef std::unique_ptr<struct target_ops, target_unpusher> target_unpush_up; | |
65 | ||
66 | \f | |
67 | ||
f6ac5f3d PA |
68 | inf_ptrace_target::~inf_ptrace_target () |
69 | {} | |
70 | ||
735f54b4 MK |
71 | \f |
72 | ||
4b8a1a28 | 73 | /* Prepare to be traced. */ |
5bf970f9 AC |
74 | |
75 | static void | |
c7c14b96 | 76 | inf_ptrace_me (void) |
5bf970f9 | 77 | { |
c7c14b96 | 78 | /* "Trace me, Dr. Memory!" */ |
0db8980c | 79 | if (ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3) 0, 0) < 0) |
50fa3001 | 80 | trace_start_error_with_name ("ptrace"); |
5bf970f9 AC |
81 | } |
82 | ||
136d6dae VP |
83 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
84 | run, ALLARGS is a string containing the arguments to the program. | |
85 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
86 | chatty about it. */ | |
5bf970f9 | 87 | |
f6ac5f3d PA |
88 | void |
89 | inf_ptrace_target::create_inferior (const char *exec_file, | |
90 | const std::string &allargs, | |
91 | char **env, int from_tty) | |
5bf970f9 | 92 | { |
2090129c SDJ |
93 | pid_t pid; |
94 | ptid_t ptid; | |
136d6dae | 95 | |
c0edd9ed JK |
96 | /* Do not change either targets above or the same target if already present. |
97 | The reason is the target stack is shared across multiple inferiors. */ | |
f6ac5f3d | 98 | int ops_already_pushed = target_is_pushed (this); |
c0edd9ed | 99 | |
9ae79dac | 100 | target_unpush_up unpusher; |
c0edd9ed JK |
101 | if (! ops_already_pushed) |
102 | { | |
103 | /* Clear possible core file with its process_stratum. */ | |
f6ac5f3d PA |
104 | push_target (this); |
105 | unpusher.reset (this); | |
c0edd9ed JK |
106 | } |
107 | ||
136d6dae | 108 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
e69860f1 | 109 | NULL, NULL, NULL); |
136d6dae | 110 | |
f2907e49 | 111 | ptid = ptid_t (pid); |
2090129c SDJ |
112 | /* We have something that executes now. We'll be running through |
113 | the shell at this point (if startup-with-shell is true), but the | |
114 | pid shouldn't change. */ | |
5b6d1e4f | 115 | add_thread_silent (this, ptid); |
2090129c | 116 | |
9ae79dac | 117 | unpusher.release (); |
5bf970f9 | 118 | |
2090129c | 119 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); |
c7c14b96 MK |
120 | |
121 | /* On some targets, there must be some explicit actions taken after | |
122 | the inferior has been started up. */ | |
2090129c | 123 | target_post_startup_inferior (ptid); |
5bf970f9 AC |
124 | } |
125 | ||
4b8a1a28 MK |
126 | /* Clean up a rotting corpse of an inferior after it died. */ |
127 | ||
f6ac5f3d PA |
128 | void |
129 | inf_ptrace_target::mourn_inferior () | |
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. */ |
e99b03dc | 137 | waitpid (inferior_ptid.pid (), &status, 0); |
4b8a1a28 | 138 | |
f6ac5f3d | 139 | inf_child_target::mourn_inferior (); |
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 | 144 | |
f6ac5f3d PA |
145 | void |
146 | inf_ptrace_target::attach (const char *args, int from_tty) | |
5bf970f9 | 147 | { |
4b8a1a28 | 148 | pid_t pid; |
181e7f93 | 149 | struct inferior *inf; |
5bf970f9 | 150 | |
c0edd9ed JK |
151 | /* Do not change either targets above or the same target if already present. |
152 | The reason is the target stack is shared across multiple inferiors. */ | |
f6ac5f3d | 153 | int ops_already_pushed = target_is_pushed (this); |
c0edd9ed | 154 | |
74164c56 | 155 | pid = parse_pid_to_attach (args); |
5bf970f9 | 156 | |
f6ffd89b | 157 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 158 | error (_("I refuse to debug myself!")); |
5bf970f9 | 159 | |
9ae79dac | 160 | target_unpush_up unpusher; |
c0edd9ed JK |
161 | if (! ops_already_pushed) |
162 | { | |
163 | /* target_pid_to_str already uses the target. Also clear possible core | |
164 | file with its process_stratum. */ | |
f6ac5f3d PA |
165 | push_target (this); |
166 | unpusher.reset (this); | |
c0edd9ed JK |
167 | } |
168 | ||
5bf970f9 AC |
169 | if (from_tty) |
170 | { | |
d9fa87f4 | 171 | const char *exec_file = get_exec_file (0); |
5bf970f9 AC |
172 | |
173 | if (exec_file) | |
a3f17187 | 174 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
a068643d | 175 | target_pid_to_str (ptid_t (pid)).c_str ()); |
5bf970f9 | 176 | else |
a3f17187 | 177 | printf_unfiltered (_("Attaching to %s\n"), |
a068643d | 178 | target_pid_to_str (ptid_t (pid)).c_str ()); |
5bf970f9 AC |
179 | } |
180 | ||
6e1e94ea MK |
181 | #ifdef PT_ATTACH |
182 | errno = 0; | |
4b8a1a28 | 183 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 184 | if (errno != 0) |
e2e0b3e5 | 185 | perror_with_name (("ptrace")); |
6e1e94ea | 186 | #else |
8a3fe4f8 | 187 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 188 | #endif |
5bf970f9 | 189 | |
6c95b8df PA |
190 | inf = current_inferior (); |
191 | inferior_appeared (inf, pid); | |
181e7f93 | 192 | inf->attach_flag = 1; |
f2907e49 | 193 | inferior_ptid = ptid_t (pid); |
7f9f62ba | 194 | |
af990527 PA |
195 | /* Always add a main thread. If some target extends the ptrace |
196 | target, it should decorate the ptid later with more info. */ | |
5b6d1e4f | 197 | thread_info *thr = add_thread_silent (this, inferior_ptid); |
00aecdcf PA |
198 | /* Don't consider the thread stopped until we've processed its |
199 | initial SIGSTOP stop. */ | |
5b6d1e4f | 200 | set_executing (this, thr->ptid, true); |
af990527 | 201 | |
9ae79dac | 202 | unpusher.release (); |
5bf970f9 AC |
203 | } |
204 | ||
6bd6f3b6 | 205 | /* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 | 206 | |
f6ac5f3d PA |
207 | void |
208 | inf_ptrace_target::detach (inferior *inf, int from_tty) | |
5bf970f9 | 209 | { |
e99b03dc | 210 | pid_t pid = inferior_ptid.pid (); |
5bf970f9 | 211 | |
0f48b757 | 212 | target_announce_detach (from_tty); |
5bf970f9 | 213 | |
6e1e94ea | 214 | #ifdef PT_DETACH |
4b8a1a28 | 215 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 216 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
217 | previously attached to the inferior. It *might* work if we |
218 | started the process ourselves. */ | |
6e1e94ea | 219 | errno = 0; |
6bd6f3b6 | 220 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0); |
6e1e94ea | 221 | if (errno != 0) |
e2e0b3e5 | 222 | perror_with_name (("ptrace")); |
6e1e94ea | 223 | #else |
8a3fe4f8 | 224 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 225 | #endif |
5bf970f9 | 226 | |
f6ac5f3d | 227 | detach_success (inf); |
ced2dffb PA |
228 | } |
229 | ||
230 | /* See inf-ptrace.h. */ | |
231 | ||
232 | void | |
f6ac5f3d | 233 | inf_ptrace_target::detach_success (inferior *inf) |
ced2dffb | 234 | { |
5bf970f9 | 235 | inferior_ptid = null_ptid; |
bc09b0c1 | 236 | detach_inferior (inf); |
7a7d3353 | 237 | |
f6ac5f3d | 238 | maybe_unpush_target (); |
5bf970f9 AC |
239 | } |
240 | ||
4b8a1a28 MK |
241 | /* Kill the inferior. */ |
242 | ||
f6ac5f3d PA |
243 | void |
244 | inf_ptrace_target::kill () | |
5bf970f9 | 245 | { |
e99b03dc | 246 | pid_t pid = inferior_ptid.pid (); |
c7c14b96 | 247 | int status; |
c7c14b96 MK |
248 | |
249 | if (pid == 0) | |
250 | return; | |
251 | ||
4b8a1a28 MK |
252 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
253 | waitpid (pid, &status, 0); | |
254 | ||
bc1e6c81 | 255 | target_mourn_inferior (inferior_ptid); |
5bf970f9 AC |
256 | } |
257 | ||
f09db380 KR |
258 | #ifndef __NetBSD__ |
259 | ||
260 | /* See inf-ptrace.h. */ | |
90ad5e1d | 261 | |
94309df7 | 262 | pid_t |
90ad5e1d PA |
263 | get_ptrace_pid (ptid_t ptid) |
264 | { | |
265 | pid_t pid; | |
266 | ||
267 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
268 | dealing with a non-threaded program/target. */ | |
e38504b3 | 269 | pid = ptid.lwp (); |
90ad5e1d | 270 | if (pid == 0) |
e99b03dc | 271 | pid = ptid.pid (); |
90ad5e1d PA |
272 | return pid; |
273 | } | |
f09db380 | 274 | #endif |
90ad5e1d | 275 | |
4b8a1a28 MK |
276 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
277 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
278 | that signal. */ | |
5bf970f9 | 279 | |
f6ac5f3d PA |
280 | void |
281 | inf_ptrace_target::resume (ptid_t ptid, int step, enum gdb_signal signal) | |
5bf970f9 | 282 | { |
f09db380 | 283 | PTRACE_TYPE_ARG1 request; |
c7c14b96 | 284 | |
d7e15655 | 285 | if (minus_one_ptid == ptid) |
4b8a1a28 MK |
286 | /* Resume all threads. Traditionally ptrace() only supports |
287 | single-threaded processes, so simply resume the inferior. */ | |
f09db380 | 288 | ptid = ptid_t (inferior_ptid.pid ()); |
c7c14b96 | 289 | |
a96d9b2e SDJ |
290 | if (catch_syscall_enabled () > 0) |
291 | request = PT_SYSCALL; | |
292 | else | |
293 | request = PT_CONTINUE; | |
294 | ||
c7c14b96 MK |
295 | if (step) |
296 | { | |
297 | /* If this system does not support PT_STEP, a higher level | |
7da6a5b9 LM |
298 | function will have called the appropriate functions to transmute the |
299 | step request into a continue request (by setting breakpoints on | |
300 | all possible successor instructions), so we don't have to | |
301 | worry about that here. */ | |
c7c14b96 MK |
302 | request = PT_STEP; |
303 | } | |
304 | ||
305 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
306 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 307 | already written a new program counter value to the child. */ |
c7c14b96 | 308 | errno = 0; |
f09db380 | 309 | gdb_ptrace (request, ptid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
310 | if (errno != 0) |
311 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
312 | } |
313 | ||
4b8a1a28 MK |
314 | /* Wait for the child specified by PTID to do something. Return the |
315 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
316 | the status in *OURSTATUS. */ | |
5bf970f9 | 317 | |
f6ac5f3d PA |
318 | ptid_t |
319 | inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
320 | int options) | |
5bf970f9 | 321 | { |
4b8a1a28 MK |
322 | pid_t pid; |
323 | int status, save_errno; | |
5bf970f9 | 324 | |
c7c14b96 MK |
325 | do |
326 | { | |
4b8a1a28 | 327 | set_sigint_trap (); |
5bf970f9 | 328 | |
4b8a1a28 MK |
329 | do |
330 | { | |
e99b03dc | 331 | pid = waitpid (ptid.pid (), &status, 0); |
4b8a1a28 MK |
332 | save_errno = errno; |
333 | } | |
334 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 335 | |
c7c14b96 | 336 | clear_sigint_trap (); |
5bf970f9 | 337 | |
c7c14b96 MK |
338 | if (pid == -1) |
339 | { | |
c7c14b96 | 340 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 341 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
342 | safe_strerror (save_errno)); |
343 | ||
344 | /* Claim it exited with unknown signal. */ | |
345 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 346 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 347 | return inferior_ptid; |
c7c14b96 MK |
348 | } |
349 | ||
4b8a1a28 | 350 | /* Ignore terminated detached child processes. */ |
e99b03dc | 351 | if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ()) |
4b8a1a28 | 352 | pid = -1; |
c7c14b96 | 353 | } |
4b8a1a28 | 354 | while (pid == -1); |
c7c14b96 MK |
355 | |
356 | store_waitstatus (ourstatus, status); | |
f2907e49 | 357 | return ptid_t (pid); |
5bf970f9 AC |
358 | } |
359 | ||
87c336f6 AA |
360 | /* Transfer data via ptrace into process PID's memory from WRITEBUF, or |
361 | from process PID's memory into READBUF. Start at target address ADDR | |
362 | and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must | |
363 | be non-null. Return the number of transferred bytes. */ | |
364 | ||
365 | static ULONGEST | |
f09db380 | 366 | inf_ptrace_peek_poke (ptid_t ptid, gdb_byte *readbuf, |
87c336f6 AA |
367 | const gdb_byte *writebuf, |
368 | ULONGEST addr, ULONGEST len) | |
369 | { | |
370 | ULONGEST n; | |
371 | unsigned int chunk; | |
372 | ||
373 | /* We transfer aligned words. Thus align ADDR down to a word | |
374 | boundary and determine how many bytes to skip at the | |
375 | beginning. */ | |
28f1c605 | 376 | ULONGEST skip = addr & (sizeof (PTRACE_TYPE_RET) - 1); |
87c336f6 AA |
377 | addr -= skip; |
378 | ||
379 | for (n = 0; | |
380 | n < len; | |
381 | n += chunk, addr += sizeof (PTRACE_TYPE_RET), skip = 0) | |
382 | { | |
383 | /* Restrict to a chunk that fits in the current word. */ | |
384 | chunk = std::min (sizeof (PTRACE_TYPE_RET) - skip, len - n); | |
385 | ||
386 | /* Use a union for type punning. */ | |
387 | union | |
388 | { | |
389 | PTRACE_TYPE_RET word; | |
390 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; | |
391 | } buf; | |
392 | ||
393 | /* Read the word, also when doing a partial word write. */ | |
394 | if (readbuf != NULL || chunk < sizeof (PTRACE_TYPE_RET)) | |
395 | { | |
396 | errno = 0; | |
f09db380 KR |
397 | buf.word = gdb_ptrace (PT_READ_I, ptid, |
398 | (PTRACE_TYPE_ARG3)(uintptr_t) addr, 0); | |
87c336f6 AA |
399 | if (errno != 0) |
400 | break; | |
401 | if (readbuf != NULL) | |
402 | memcpy (readbuf + n, buf.byte + skip, chunk); | |
403 | } | |
404 | if (writebuf != NULL) | |
405 | { | |
406 | memcpy (buf.byte + skip, writebuf + n, chunk); | |
407 | errno = 0; | |
f09db380 | 408 | gdb_ptrace (PT_WRITE_D, ptid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, |
87c336f6 AA |
409 | buf.word); |
410 | if (errno != 0) | |
411 | { | |
412 | /* Using the appropriate one (I or D) is necessary for | |
413 | Gould NP1, at least. */ | |
414 | errno = 0; | |
f09db380 KR |
415 | gdb_ptrace (PT_WRITE_I, ptid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, |
416 | buf.word); | |
87c336f6 AA |
417 | if (errno != 0) |
418 | break; | |
419 | } | |
420 | } | |
421 | } | |
422 | ||
423 | return n; | |
424 | } | |
425 | ||
edcc890f | 426 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 427 | |
f6ac5f3d PA |
428 | enum target_xfer_status |
429 | inf_ptrace_target::xfer_partial (enum target_object object, | |
430 | const char *annex, gdb_byte *readbuf, | |
431 | const gdb_byte *writebuf, | |
432 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
5bf970f9 | 433 | { |
f09db380 | 434 | ptid_t ptid = inferior_ptid; |
4b8a1a28 | 435 | |
5bf970f9 AC |
436 | switch (object) |
437 | { | |
438 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
439 | #ifdef PT_IO |
440 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
441 | request that promises to be much more efficient in reading | |
442 | and writing data in the traced process's address space. */ | |
443 | { | |
444 | struct ptrace_io_desc piod; | |
4b8a1a28 | 445 | |
f929a579 | 446 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
447 | for instruction and data. However, on OpenBSD 3.9 and |
448 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
449 | mapped read-only. Since most code segments will be | |
450 | read-only, using PIOD_WRITE_D will prevent us from | |
451 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
452 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
453 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
454 | piod.piod_offs = (void *) (long) offset; | |
455 | piod.piod_len = len; | |
456 | ||
457 | errno = 0; | |
f09db380 | 458 | if (gdb_ptrace (PT_IO, ptid, (caddr_t)&piod, 0) == 0) |
9b409511 | 459 | { |
9b409511 | 460 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
461 | *xfered_len = piod.piod_len; |
462 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 463 | } |
f929a579 AC |
464 | /* If the PT_IO request is somehow not supported, fallback on |
465 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
466 | to indicate failure. */ | |
467 | if (errno != EINVAL) | |
9b409511 | 468 | return TARGET_XFER_EOF; |
f929a579 AC |
469 | } |
470 | #endif | |
f09db380 | 471 | *xfered_len = inf_ptrace_peek_poke (ptid, readbuf, writebuf, |
87c336f6 AA |
472 | offset, len); |
473 | return *xfered_len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF; | |
5bf970f9 AC |
474 | |
475 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 476 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
477 | |
478 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
479 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
480 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
481 | request that allows us to read the auxilliary vector. Other | |
482 | BSD's may follow if they feel the need to support PIE. */ | |
483 | { | |
484 | struct ptrace_io_desc piod; | |
485 | ||
486 | if (writebuf) | |
2ed4b548 | 487 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
488 | piod.piod_op = PIOD_READ_AUXV; |
489 | piod.piod_addr = readbuf; | |
490 | piod.piod_offs = (void *) (long) offset; | |
491 | piod.piod_len = len; | |
492 | ||
493 | errno = 0; | |
f09db380 | 494 | if (gdb_ptrace (PT_IO, ptid, (caddr_t)&piod, 0) == 0) |
9b409511 | 495 | { |
9b409511 | 496 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
497 | *xfered_len = piod.piod_len; |
498 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 499 | } |
e8ace1c0 MK |
500 | } |
501 | #endif | |
2ed4b548 | 502 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
503 | |
504 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 505 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
506 | |
507 | default: | |
2ed4b548 | 508 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
509 | } |
510 | } | |
511 | ||
4b8a1a28 | 512 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 | 513 | |
57810aa7 | 514 | bool |
f6ac5f3d | 515 | inf_ptrace_target::thread_alive (ptid_t ptid) |
c7c14b96 | 516 | { |
4b8a1a28 | 517 | /* ??? Is kill the right way to do this? */ |
e99b03dc | 518 | return (::kill (ptid.pid (), 0) != -1); |
c7c14b96 MK |
519 | } |
520 | ||
521 | /* Print status information about what we're accessing. */ | |
522 | ||
f6ac5f3d PA |
523 | void |
524 | inf_ptrace_target::files_info () | |
c7c14b96 | 525 | { |
181e7f93 PA |
526 | struct inferior *inf = current_inferior (); |
527 | ||
4b8a1a28 | 528 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 529 | inf->attach_flag ? "attached" : "child", |
a068643d | 530 | target_pid_to_str (inferior_ptid).c_str ()); |
5bf970f9 AC |
531 | } |
532 | ||
a068643d | 533 | std::string |
f6ac5f3d | 534 | inf_ptrace_target::pid_to_str (ptid_t ptid) |
117de6a9 PA |
535 | { |
536 | return normal_pid_to_str (ptid); | |
537 | } |