Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
3666a048 | 3 | Copyright (C) 1988-2021 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 | ||
f6ac5f3d PA |
52 | inf_ptrace_target::~inf_ptrace_target () |
53 | {} | |
54 | ||
735f54b4 MK |
55 | \f |
56 | ||
4b8a1a28 | 57 | /* Prepare to be traced. */ |
5bf970f9 AC |
58 | |
59 | static void | |
c7c14b96 | 60 | inf_ptrace_me (void) |
5bf970f9 | 61 | { |
c7c14b96 | 62 | /* "Trace me, Dr. Memory!" */ |
0db8980c | 63 | if (ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3) 0, 0) < 0) |
50fa3001 | 64 | trace_start_error_with_name ("ptrace"); |
5bf970f9 AC |
65 | } |
66 | ||
136d6dae VP |
67 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
68 | run, ALLARGS is a string containing the arguments to the program. | |
69 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
70 | chatty about it. */ | |
5bf970f9 | 71 | |
f6ac5f3d PA |
72 | void |
73 | inf_ptrace_target::create_inferior (const char *exec_file, | |
74 | const std::string &allargs, | |
75 | char **env, int from_tty) | |
5bf970f9 | 76 | { |
c8fbd44a SM |
77 | inferior *inf = current_inferior (); |
78 | ||
c0edd9ed JK |
79 | /* Do not change either targets above or the same target if already present. |
80 | The reason is the target stack is shared across multiple inferiors. */ | |
c8fbd44a | 81 | int ops_already_pushed = inf->target_is_pushed (this); |
c0edd9ed | 82 | |
9ae79dac | 83 | target_unpush_up unpusher; |
c0edd9ed JK |
84 | if (! ops_already_pushed) |
85 | { | |
86 | /* Clear possible core file with its process_stratum. */ | |
c8fbd44a | 87 | inf->push_target (this); |
f6ac5f3d | 88 | unpusher.reset (this); |
c0edd9ed JK |
89 | } |
90 | ||
6155c136 PA |
91 | pid_t pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, |
92 | NULL, NULL, NULL); | |
136d6dae | 93 | |
6155c136 | 94 | ptid_t ptid (pid); |
2090129c SDJ |
95 | /* We have something that executes now. We'll be running through |
96 | the shell at this point (if startup-with-shell is true), but the | |
97 | pid shouldn't change. */ | |
6155c136 PA |
98 | thread_info *thr = add_thread_silent (this, ptid); |
99 | switch_to_thread (thr); | |
2090129c | 100 | |
9ae79dac | 101 | unpusher.release (); |
5bf970f9 | 102 | |
2090129c | 103 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); |
c7c14b96 MK |
104 | |
105 | /* On some targets, there must be some explicit actions taken after | |
106 | the inferior has been started up. */ | |
2090129c | 107 | target_post_startup_inferior (ptid); |
5bf970f9 AC |
108 | } |
109 | ||
4b8a1a28 MK |
110 | /* Clean up a rotting corpse of an inferior after it died. */ |
111 | ||
f6ac5f3d PA |
112 | void |
113 | inf_ptrace_target::mourn_inferior () | |
5bf970f9 | 114 | { |
4b8a1a28 MK |
115 | int status; |
116 | ||
117 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 118 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 119 | dealing with a process that we attached to. Such a process will |
3d450bdd | 120 | only report its exit status to its original parent. */ |
e99b03dc | 121 | waitpid (inferior_ptid.pid (), &status, 0); |
4b8a1a28 | 122 | |
f6ac5f3d | 123 | inf_child_target::mourn_inferior (); |
5bf970f9 AC |
124 | } |
125 | ||
4b8a1a28 MK |
126 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
127 | be chatty about it. */ | |
5bf970f9 | 128 | |
f6ac5f3d PA |
129 | void |
130 | inf_ptrace_target::attach (const char *args, int from_tty) | |
5bf970f9 | 131 | { |
c8fbd44a | 132 | inferior *inf = current_inferior (); |
5bf970f9 | 133 | |
c0edd9ed JK |
134 | /* Do not change either targets above or the same target if already present. |
135 | The reason is the target stack is shared across multiple inferiors. */ | |
c8fbd44a | 136 | int ops_already_pushed = inf->target_is_pushed (this); |
c0edd9ed | 137 | |
c8fbd44a | 138 | pid_t pid = parse_pid_to_attach (args); |
5bf970f9 | 139 | |
f6ffd89b | 140 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 141 | error (_("I refuse to debug myself!")); |
5bf970f9 | 142 | |
9ae79dac | 143 | target_unpush_up unpusher; |
c0edd9ed JK |
144 | if (! ops_already_pushed) |
145 | { | |
146 | /* target_pid_to_str already uses the target. Also clear possible core | |
147 | file with its process_stratum. */ | |
02980c56 | 148 | inf->push_target (this); |
f6ac5f3d | 149 | unpusher.reset (this); |
c0edd9ed JK |
150 | } |
151 | ||
5bf970f9 AC |
152 | if (from_tty) |
153 | { | |
d9fa87f4 | 154 | const char *exec_file = get_exec_file (0); |
5bf970f9 AC |
155 | |
156 | if (exec_file) | |
a3f17187 | 157 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
a068643d | 158 | target_pid_to_str (ptid_t (pid)).c_str ()); |
5bf970f9 | 159 | else |
a3f17187 | 160 | printf_unfiltered (_("Attaching to %s\n"), |
a068643d | 161 | target_pid_to_str (ptid_t (pid)).c_str ()); |
5bf970f9 AC |
162 | } |
163 | ||
6e1e94ea MK |
164 | #ifdef PT_ATTACH |
165 | errno = 0; | |
4b8a1a28 | 166 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 167 | if (errno != 0) |
e2e0b3e5 | 168 | perror_with_name (("ptrace")); |
6e1e94ea | 169 | #else |
8a3fe4f8 | 170 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 171 | #endif |
5bf970f9 | 172 | |
6c95b8df | 173 | inferior_appeared (inf, pid); |
181e7f93 | 174 | inf->attach_flag = 1; |
7f9f62ba | 175 | |
af990527 PA |
176 | /* Always add a main thread. If some target extends the ptrace |
177 | target, it should decorate the ptid later with more info. */ | |
6155c136 PA |
178 | thread_info *thr = add_thread_silent (this, ptid_t (pid)); |
179 | switch_to_thread (thr); | |
180 | ||
00aecdcf PA |
181 | /* Don't consider the thread stopped until we've processed its |
182 | initial SIGSTOP stop. */ | |
5b6d1e4f | 183 | set_executing (this, thr->ptid, true); |
af990527 | 184 | |
9ae79dac | 185 | unpusher.release (); |
5bf970f9 AC |
186 | } |
187 | ||
6bd6f3b6 | 188 | /* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 | 189 | |
f6ac5f3d PA |
190 | void |
191 | inf_ptrace_target::detach (inferior *inf, int from_tty) | |
5bf970f9 | 192 | { |
e99b03dc | 193 | pid_t pid = inferior_ptid.pid (); |
5bf970f9 | 194 | |
0f48b757 | 195 | target_announce_detach (from_tty); |
5bf970f9 | 196 | |
6e1e94ea | 197 | #ifdef PT_DETACH |
4b8a1a28 | 198 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 199 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
200 | previously attached to the inferior. It *might* work if we |
201 | started the process ourselves. */ | |
6e1e94ea | 202 | errno = 0; |
6bd6f3b6 | 203 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0); |
6e1e94ea | 204 | if (errno != 0) |
e2e0b3e5 | 205 | perror_with_name (("ptrace")); |
6e1e94ea | 206 | #else |
8a3fe4f8 | 207 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 208 | #endif |
5bf970f9 | 209 | |
f6ac5f3d | 210 | detach_success (inf); |
ced2dffb PA |
211 | } |
212 | ||
213 | /* See inf-ptrace.h. */ | |
214 | ||
215 | void | |
f6ac5f3d | 216 | inf_ptrace_target::detach_success (inferior *inf) |
ced2dffb | 217 | { |
6155c136 | 218 | switch_to_no_thread (); |
bc09b0c1 | 219 | detach_inferior (inf); |
7a7d3353 | 220 | |
f6ac5f3d | 221 | maybe_unpush_target (); |
5bf970f9 AC |
222 | } |
223 | ||
4b8a1a28 MK |
224 | /* Kill the inferior. */ |
225 | ||
f6ac5f3d PA |
226 | void |
227 | inf_ptrace_target::kill () | |
5bf970f9 | 228 | { |
e99b03dc | 229 | pid_t pid = inferior_ptid.pid (); |
c7c14b96 | 230 | int status; |
c7c14b96 MK |
231 | |
232 | if (pid == 0) | |
233 | return; | |
234 | ||
4b8a1a28 MK |
235 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
236 | waitpid (pid, &status, 0); | |
237 | ||
bc1e6c81 | 238 | target_mourn_inferior (inferior_ptid); |
5bf970f9 AC |
239 | } |
240 | ||
f09db380 KR |
241 | #ifndef __NetBSD__ |
242 | ||
243 | /* See inf-ptrace.h. */ | |
90ad5e1d | 244 | |
94309df7 | 245 | pid_t |
90ad5e1d PA |
246 | get_ptrace_pid (ptid_t ptid) |
247 | { | |
248 | pid_t pid; | |
249 | ||
250 | /* If we have an LWPID to work with, use it. Otherwise, we're | |
251 | dealing with a non-threaded program/target. */ | |
e38504b3 | 252 | pid = ptid.lwp (); |
90ad5e1d | 253 | if (pid == 0) |
e99b03dc | 254 | pid = ptid.pid (); |
90ad5e1d PA |
255 | return pid; |
256 | } | |
f09db380 | 257 | #endif |
90ad5e1d | 258 | |
4b8a1a28 MK |
259 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
260 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
261 | that signal. */ | |
5bf970f9 | 262 | |
f6ac5f3d PA |
263 | void |
264 | inf_ptrace_target::resume (ptid_t ptid, int step, enum gdb_signal signal) | |
5bf970f9 | 265 | { |
f09db380 | 266 | PTRACE_TYPE_ARG1 request; |
c7c14b96 | 267 | |
d7e15655 | 268 | if (minus_one_ptid == ptid) |
4b8a1a28 MK |
269 | /* Resume all threads. Traditionally ptrace() only supports |
270 | single-threaded processes, so simply resume the inferior. */ | |
f09db380 | 271 | ptid = ptid_t (inferior_ptid.pid ()); |
c7c14b96 | 272 | |
a96d9b2e SDJ |
273 | if (catch_syscall_enabled () > 0) |
274 | request = PT_SYSCALL; | |
275 | else | |
276 | request = PT_CONTINUE; | |
277 | ||
c7c14b96 MK |
278 | if (step) |
279 | { | |
280 | /* If this system does not support PT_STEP, a higher level | |
7da6a5b9 LM |
281 | function will have called the appropriate functions to transmute the |
282 | step request into a continue request (by setting breakpoints on | |
283 | all possible successor instructions), so we don't have to | |
284 | worry about that here. */ | |
c7c14b96 MK |
285 | request = PT_STEP; |
286 | } | |
287 | ||
288 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
289 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 290 | already written a new program counter value to the child. */ |
c7c14b96 | 291 | errno = 0; |
f09db380 | 292 | gdb_ptrace (request, ptid, (PTRACE_TYPE_ARG3)1, gdb_signal_to_host (signal)); |
c7c14b96 MK |
293 | if (errno != 0) |
294 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
295 | } |
296 | ||
4b8a1a28 MK |
297 | /* Wait for the child specified by PTID to do something. Return the |
298 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
299 | the status in *OURSTATUS. */ | |
5bf970f9 | 300 | |
f6ac5f3d PA |
301 | ptid_t |
302 | inf_ptrace_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus, | |
b60cea74 | 303 | target_wait_flags options) |
5bf970f9 | 304 | { |
4b8a1a28 MK |
305 | pid_t pid; |
306 | int status, save_errno; | |
5bf970f9 | 307 | |
c7c14b96 MK |
308 | do |
309 | { | |
4b8a1a28 | 310 | set_sigint_trap (); |
5bf970f9 | 311 | |
4b8a1a28 MK |
312 | do |
313 | { | |
e99b03dc | 314 | pid = waitpid (ptid.pid (), &status, 0); |
4b8a1a28 MK |
315 | save_errno = errno; |
316 | } | |
317 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 318 | |
c7c14b96 | 319 | clear_sigint_trap (); |
5bf970f9 | 320 | |
c7c14b96 MK |
321 | if (pid == -1) |
322 | { | |
c7c14b96 | 323 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 324 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
325 | safe_strerror (save_errno)); |
326 | ||
327 | /* Claim it exited with unknown signal. */ | |
328 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
a493e3e2 | 329 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; |
fb66883a | 330 | return inferior_ptid; |
c7c14b96 MK |
331 | } |
332 | ||
4b8a1a28 | 333 | /* Ignore terminated detached child processes. */ |
f37e5866 | 334 | if (!WIFSTOPPED (status) && find_inferior_pid (this, pid) == nullptr) |
4b8a1a28 | 335 | pid = -1; |
c7c14b96 | 336 | } |
4b8a1a28 | 337 | while (pid == -1); |
c7c14b96 MK |
338 | |
339 | store_waitstatus (ourstatus, status); | |
f2907e49 | 340 | return ptid_t (pid); |
5bf970f9 AC |
341 | } |
342 | ||
87c336f6 AA |
343 | /* Transfer data via ptrace into process PID's memory from WRITEBUF, or |
344 | from process PID's memory into READBUF. Start at target address ADDR | |
345 | and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must | |
346 | be non-null. Return the number of transferred bytes. */ | |
347 | ||
348 | static ULONGEST | |
f09db380 | 349 | inf_ptrace_peek_poke (ptid_t ptid, gdb_byte *readbuf, |
87c336f6 AA |
350 | const gdb_byte *writebuf, |
351 | ULONGEST addr, ULONGEST len) | |
352 | { | |
353 | ULONGEST n; | |
354 | unsigned int chunk; | |
355 | ||
356 | /* We transfer aligned words. Thus align ADDR down to a word | |
357 | boundary and determine how many bytes to skip at the | |
358 | beginning. */ | |
28f1c605 | 359 | ULONGEST skip = addr & (sizeof (PTRACE_TYPE_RET) - 1); |
87c336f6 AA |
360 | addr -= skip; |
361 | ||
362 | for (n = 0; | |
363 | n < len; | |
364 | n += chunk, addr += sizeof (PTRACE_TYPE_RET), skip = 0) | |
365 | { | |
366 | /* Restrict to a chunk that fits in the current word. */ | |
367 | chunk = std::min (sizeof (PTRACE_TYPE_RET) - skip, len - n); | |
368 | ||
369 | /* Use a union for type punning. */ | |
370 | union | |
371 | { | |
372 | PTRACE_TYPE_RET word; | |
373 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; | |
374 | } buf; | |
375 | ||
376 | /* Read the word, also when doing a partial word write. */ | |
377 | if (readbuf != NULL || chunk < sizeof (PTRACE_TYPE_RET)) | |
378 | { | |
379 | errno = 0; | |
f09db380 KR |
380 | buf.word = gdb_ptrace (PT_READ_I, ptid, |
381 | (PTRACE_TYPE_ARG3)(uintptr_t) addr, 0); | |
87c336f6 AA |
382 | if (errno != 0) |
383 | break; | |
384 | if (readbuf != NULL) | |
385 | memcpy (readbuf + n, buf.byte + skip, chunk); | |
386 | } | |
387 | if (writebuf != NULL) | |
388 | { | |
389 | memcpy (buf.byte + skip, writebuf + n, chunk); | |
390 | errno = 0; | |
f09db380 | 391 | gdb_ptrace (PT_WRITE_D, ptid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, |
87c336f6 AA |
392 | buf.word); |
393 | if (errno != 0) | |
394 | { | |
395 | /* Using the appropriate one (I or D) is necessary for | |
396 | Gould NP1, at least. */ | |
397 | errno = 0; | |
f09db380 KR |
398 | gdb_ptrace (PT_WRITE_I, ptid, (PTRACE_TYPE_ARG3)(uintptr_t) addr, |
399 | buf.word); | |
87c336f6 AA |
400 | if (errno != 0) |
401 | break; | |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | return n; | |
407 | } | |
408 | ||
edcc890f | 409 | /* Implement the to_xfer_partial target_ops method. */ |
5bf970f9 | 410 | |
f6ac5f3d PA |
411 | enum target_xfer_status |
412 | inf_ptrace_target::xfer_partial (enum target_object object, | |
413 | const char *annex, gdb_byte *readbuf, | |
414 | const gdb_byte *writebuf, | |
415 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
5bf970f9 | 416 | { |
f09db380 | 417 | ptid_t ptid = inferior_ptid; |
4b8a1a28 | 418 | |
5bf970f9 AC |
419 | switch (object) |
420 | { | |
421 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
422 | #ifdef PT_IO |
423 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
424 | request that promises to be much more efficient in reading | |
425 | and writing data in the traced process's address space. */ | |
426 | { | |
427 | struct ptrace_io_desc piod; | |
4b8a1a28 | 428 | |
f929a579 | 429 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
430 | for instruction and data. However, on OpenBSD 3.9 and |
431 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
432 | mapped read-only. Since most code segments will be | |
433 | read-only, using PIOD_WRITE_D will prevent us from | |
434 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
435 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
436 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
437 | piod.piod_offs = (void *) (long) offset; | |
438 | piod.piod_len = len; | |
439 | ||
440 | errno = 0; | |
f09db380 | 441 | if (gdb_ptrace (PT_IO, ptid, (caddr_t)&piod, 0) == 0) |
9b409511 | 442 | { |
9b409511 | 443 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
444 | *xfered_len = piod.piod_len; |
445 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 446 | } |
f929a579 AC |
447 | /* If the PT_IO request is somehow not supported, fallback on |
448 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
449 | to indicate failure. */ | |
450 | if (errno != EINVAL) | |
9b409511 | 451 | return TARGET_XFER_EOF; |
f929a579 AC |
452 | } |
453 | #endif | |
f09db380 | 454 | *xfered_len = inf_ptrace_peek_poke (ptid, readbuf, writebuf, |
87c336f6 AA |
455 | offset, len); |
456 | return *xfered_len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF; | |
5bf970f9 AC |
457 | |
458 | case TARGET_OBJECT_UNWIND_TABLE: | |
2ed4b548 | 459 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
460 | |
461 | case TARGET_OBJECT_AUXV: | |
e8ace1c0 MK |
462 | #if defined (PT_IO) && defined (PIOD_READ_AUXV) |
463 | /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO | |
464 | request that allows us to read the auxilliary vector. Other | |
465 | BSD's may follow if they feel the need to support PIE. */ | |
466 | { | |
467 | struct ptrace_io_desc piod; | |
468 | ||
469 | if (writebuf) | |
2ed4b548 | 470 | return TARGET_XFER_E_IO; |
e8ace1c0 MK |
471 | piod.piod_op = PIOD_READ_AUXV; |
472 | piod.piod_addr = readbuf; | |
473 | piod.piod_offs = (void *) (long) offset; | |
474 | piod.piod_len = len; | |
475 | ||
476 | errno = 0; | |
f09db380 | 477 | if (gdb_ptrace (PT_IO, ptid, (caddr_t)&piod, 0) == 0) |
9b409511 | 478 | { |
9b409511 | 479 | /* Return the actual number of bytes read or written. */ |
493443a4 MK |
480 | *xfered_len = piod.piod_len; |
481 | return (piod.piod_len == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK; | |
9b409511 | 482 | } |
e8ace1c0 MK |
483 | } |
484 | #endif | |
2ed4b548 | 485 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
486 | |
487 | case TARGET_OBJECT_WCOOKIE: | |
2ed4b548 | 488 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
489 | |
490 | default: | |
2ed4b548 | 491 | return TARGET_XFER_E_IO; |
5bf970f9 AC |
492 | } |
493 | } | |
494 | ||
4b8a1a28 | 495 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 | 496 | |
57810aa7 | 497 | bool |
f6ac5f3d | 498 | inf_ptrace_target::thread_alive (ptid_t ptid) |
c7c14b96 | 499 | { |
4b8a1a28 | 500 | /* ??? Is kill the right way to do this? */ |
e99b03dc | 501 | return (::kill (ptid.pid (), 0) != -1); |
c7c14b96 MK |
502 | } |
503 | ||
504 | /* Print status information about what we're accessing. */ | |
505 | ||
f6ac5f3d PA |
506 | void |
507 | inf_ptrace_target::files_info () | |
c7c14b96 | 508 | { |
181e7f93 PA |
509 | struct inferior *inf = current_inferior (); |
510 | ||
4b8a1a28 | 511 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 512 | inf->attach_flag ? "attached" : "child", |
a068643d | 513 | target_pid_to_str (inferior_ptid).c_str ()); |
5bf970f9 AC |
514 | } |
515 | ||
a068643d | 516 | std::string |
f6ac5f3d | 517 | inf_ptrace_target::pid_to_str (ptid_t ptid) |
117de6a9 PA |
518 | { |
519 | return normal_pid_to_str (ptid); | |
520 | } |