Commit | Line | Data |
---|---|---|
2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 | 2 | |
6aba47ca | 3 | Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, |
0fb0cc75 | 4 | 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009 |
8785ced0 | 5 | Free Software Foundation, Inc. |
5bf970f9 AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
5bf970f9 AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
5bf970f9 AC |
21 | |
22 | #include "defs.h" | |
5bf970f9 | 23 | #include "command.h" |
2c4a536d MK |
24 | #include "inferior.h" |
25 | #include "inflow.h" | |
191c4426 | 26 | #include "terminal.h" |
5bf970f9 | 27 | #include "gdbcore.h" |
8785ced0 | 28 | #include "regcache.h" |
5bf970f9 | 29 | |
8785ced0 | 30 | #include "gdb_assert.h" |
2c4a536d MK |
31 | #include "gdb_string.h" |
32 | #include "gdb_ptrace.h" | |
34a17005 | 33 | #include "gdb_wait.h" |
5bf970f9 AC |
34 | #include <signal.h> |
35 | ||
2c0b251b | 36 | #include "inf-ptrace.h" |
2c4a536d | 37 | #include "inf-child.h" |
af990527 | 38 | #include "gdbthread.h" |
2c4a536d | 39 | |
c7c14b96 MK |
40 | \f |
41 | ||
735f54b4 MK |
42 | #ifdef PT_GET_PROCESS_STATE |
43 | ||
44 | static int | |
ee057212 | 45 | inf_ptrace_follow_fork (struct target_ops *ops, int follow_child) |
735f54b4 MK |
46 | { |
47 | pid_t pid, fpid; | |
48 | ptrace_state_t pe; | |
4e1c45ea | 49 | struct thread_info *last_tp = NULL; |
735f54b4 MK |
50 | |
51 | /* FIXME: kettenis/20050720: This stuff should really be passed as | |
52 | an argument by our caller. */ | |
53 | { | |
54 | ptid_t ptid; | |
55 | struct target_waitstatus status; | |
56 | ||
57 | get_last_target_status (&ptid, &status); | |
58 | gdb_assert (status.kind == TARGET_WAITKIND_FORKED); | |
59 | ||
60 | pid = ptid_get_pid (ptid); | |
4e1c45ea | 61 | last_tp = find_thread_pid (ptid); |
735f54b4 MK |
62 | } |
63 | ||
64 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
65 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
66 | perror_with_name (("ptrace")); | |
67 | ||
68 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
69 | fpid = pe.pe_other_pid; | |
70 | ||
71 | if (follow_child) | |
72 | { | |
4e1c45ea PA |
73 | /* Copy user stepping state to the new inferior thread. */ |
74 | struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint; | |
75 | CORE_ADDR step_range_start = last_tp->step_range_start; | |
76 | CORE_ADDR step_range_end = last_tp->step_range_end; | |
77 | struct frame_id step_frame_id = last_tp->step_frame_id; | |
191c4426 | 78 | struct inferior *parent_inf, *child_inf; |
4e1c45ea PA |
79 | struct thread_info *tp; |
80 | ||
81 | /* Otherwise, deleting the parent would get rid of this | |
82 | breakpoint. */ | |
83 | last_tp->step_resume_breakpoint = NULL; | |
84 | ||
191c4426 PA |
85 | parent_inf = find_inferior_pid (pid); |
86 | ||
87 | /* Add the child. */ | |
88 | child_inf = add_inferior (fpid); | |
89 | child_inf->attach_flag = parent_inf->attach_flag; | |
90 | copy_terminal_info (child_inf, parent_inf); | |
91 | ||
4e1c45ea PA |
92 | /* Before detaching from the parent, remove all breakpoints from |
93 | it. */ | |
77435e4c | 94 | remove_breakpoints (); |
735f54b4 MK |
95 | |
96 | if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
97 | perror_with_name (("ptrace")); | |
4e1c45ea | 98 | |
7f9f62ba PA |
99 | /* Switch inferior_ptid out of the parent's way. */ |
100 | inferior_ptid = pid_to_ptid (fpid); | |
101 | ||
4e1c45ea | 102 | /* Delete the parent. */ |
7f9f62ba | 103 | detach_inferior (pid); |
4e1c45ea | 104 | |
4e1c45ea PA |
105 | tp = add_thread_silent (inferior_ptid); |
106 | ||
107 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
108 | tp->step_range_start = step_range_start; | |
109 | tp->step_range_end = step_range_end; | |
110 | tp->step_frame_id = step_frame_id; | |
111 | ||
112 | /* Reset breakpoints in the child as appropriate. */ | |
113 | follow_inferior_reset_breakpoints (); | |
735f54b4 MK |
114 | } |
115 | else | |
116 | { | |
117 | inferior_ptid = pid_to_ptid (pid); | |
b242c3c2 PA |
118 | |
119 | /* Breakpoints have already been detached from the child by | |
120 | infrun.c. */ | |
735f54b4 MK |
121 | |
122 | if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
123 | perror_with_name (("ptrace")); | |
7f9f62ba | 124 | detach_inferior (pid); |
735f54b4 MK |
125 | } |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | #endif /* PT_GET_PROCESS_STATE */ | |
131 | \f | |
132 | ||
4b8a1a28 | 133 | /* Prepare to be traced. */ |
5bf970f9 AC |
134 | |
135 | static void | |
c7c14b96 | 136 | inf_ptrace_me (void) |
5bf970f9 | 137 | { |
c7c14b96 | 138 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 139 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
140 | } |
141 | ||
136d6dae VP |
142 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
143 | run, ALLARGS is a string containing the arguments to the program. | |
144 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
145 | chatty about it. */ | |
5bf970f9 AC |
146 | |
147 | static void | |
136d6dae VP |
148 | inf_ptrace_create_inferior (struct target_ops *ops, |
149 | char *exec_file, char *allargs, char **env, | |
150 | int from_tty) | |
5bf970f9 | 151 | { |
136d6dae VP |
152 | int pid; |
153 | ||
154 | pid = fork_inferior (exec_file, allargs, env, inf_ptrace_me, NULL, | |
155 | NULL, NULL); | |
156 | ||
157 | push_target (ops); | |
5bf970f9 | 158 | |
c7c14b96 MK |
159 | /* On some targets, there must be some explicit synchronization |
160 | between the parent and child processes after the debugger | |
161 | forks, and before the child execs the debuggee program. This | |
162 | call basically gives permission for the child to exec. */ | |
5bf970f9 | 163 | |
c7c14b96 | 164 | target_acknowledge_created_inferior (pid); |
5bf970f9 | 165 | |
c7c14b96 MK |
166 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
167 | be 1 or 2 depending on whether we're starting without or with a | |
168 | shell. */ | |
169 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
170 | ||
171 | /* On some targets, there must be some explicit actions taken after | |
172 | the inferior has been started up. */ | |
173 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
174 | } |
175 | ||
e4ef629d MK |
176 | #ifdef PT_GET_PROCESS_STATE |
177 | ||
178 | static void | |
179 | inf_ptrace_post_startup_inferior (ptid_t pid) | |
180 | { | |
181 | ptrace_event_t pe; | |
182 | ||
183 | /* Set the initial event mask. */ | |
184 | memset (&pe, 0, sizeof pe); | |
185 | pe.pe_set_event |= PTRACE_FORK; | |
186 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
187 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
188 | perror_with_name (("ptrace")); | |
189 | } | |
190 | ||
191 | #endif | |
192 | ||
4b8a1a28 MK |
193 | /* Clean up a rotting corpse of an inferior after it died. */ |
194 | ||
c7c14b96 | 195 | static void |
136d6dae | 196 | inf_ptrace_mourn_inferior (struct target_ops *ops) |
5bf970f9 | 197 | { |
4b8a1a28 MK |
198 | int status; |
199 | ||
200 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 201 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 202 | dealing with a process that we attached to. Such a process will |
3d450bdd | 203 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
204 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
205 | ||
c7c14b96 | 206 | generic_mourn_inferior (); |
d90e17a7 PA |
207 | |
208 | if (!have_inferiors ()) | |
209 | unpush_target (ops); | |
5bf970f9 AC |
210 | } |
211 | ||
4b8a1a28 MK |
212 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
213 | be chatty about it. */ | |
5bf970f9 AC |
214 | |
215 | static void | |
136d6dae | 216 | inf_ptrace_attach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 AC |
217 | { |
218 | char *exec_file; | |
4b8a1a28 | 219 | pid_t pid; |
5bf970f9 | 220 | char *dummy; |
181e7f93 | 221 | struct inferior *inf; |
5bf970f9 AC |
222 | |
223 | if (!args) | |
e2e0b3e5 | 224 | error_no_arg (_("process-id to attach")); |
5bf970f9 AC |
225 | |
226 | dummy = args; | |
227 | pid = strtol (args, &dummy, 0); | |
f6ffd89b | 228 | /* Some targets don't set errno on errors, grrr! */ |
6e1e94ea | 229 | if (pid == 0 && args == dummy) |
8a3fe4f8 | 230 | error (_("Illegal process-id: %s."), args); |
5bf970f9 | 231 | |
f6ffd89b | 232 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 233 | error (_("I refuse to debug myself!")); |
5bf970f9 AC |
234 | |
235 | if (from_tty) | |
236 | { | |
4b8a1a28 | 237 | exec_file = get_exec_file (0); |
5bf970f9 AC |
238 | |
239 | if (exec_file) | |
a3f17187 | 240 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
241 | target_pid_to_str (pid_to_ptid (pid))); |
242 | else | |
a3f17187 | 243 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
244 | target_pid_to_str (pid_to_ptid (pid))); |
245 | ||
246 | gdb_flush (gdb_stdout); | |
247 | } | |
248 | ||
6e1e94ea MK |
249 | #ifdef PT_ATTACH |
250 | errno = 0; | |
4b8a1a28 | 251 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 252 | if (errno != 0) |
e2e0b3e5 | 253 | perror_with_name (("ptrace")); |
6e1e94ea | 254 | #else |
8a3fe4f8 | 255 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 256 | #endif |
5bf970f9 AC |
257 | |
258 | inferior_ptid = pid_to_ptid (pid); | |
af990527 | 259 | |
181e7f93 PA |
260 | inf = add_inferior (pid); |
261 | inf->attach_flag = 1; | |
7f9f62ba | 262 | |
af990527 PA |
263 | /* Always add a main thread. If some target extends the ptrace |
264 | target, it should decorate the ptid later with more info. */ | |
265 | add_thread_silent (inferior_ptid); | |
266 | ||
136d6dae | 267 | push_target(ops); |
5bf970f9 AC |
268 | } |
269 | ||
e4ef629d MK |
270 | #ifdef PT_GET_PROCESS_STATE |
271 | ||
272 | void | |
273 | inf_ptrace_post_attach (int pid) | |
274 | { | |
275 | ptrace_event_t pe; | |
276 | ||
277 | /* Set the initial event mask. */ | |
278 | memset (&pe, 0, sizeof pe); | |
279 | pe.pe_set_event |= PTRACE_FORK; | |
280 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
281 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
282 | perror_with_name (("ptrace")); | |
283 | } | |
284 | ||
285 | #endif | |
286 | ||
4b8a1a28 | 287 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 288 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
289 | |
290 | static void | |
136d6dae | 291 | inf_ptrace_detach (struct target_ops *ops, char *args, int from_tty) |
5bf970f9 | 292 | { |
4b8a1a28 | 293 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 294 | int sig = 0; |
5bf970f9 AC |
295 | |
296 | if (from_tty) | |
297 | { | |
298 | char *exec_file = get_exec_file (0); | |
299 | if (exec_file == 0) | |
300 | exec_file = ""; | |
a3f17187 | 301 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
302 | target_pid_to_str (pid_to_ptid (pid))); |
303 | gdb_flush (gdb_stdout); | |
304 | } | |
305 | if (args) | |
6e1e94ea | 306 | sig = atoi (args); |
5bf970f9 | 307 | |
6e1e94ea | 308 | #ifdef PT_DETACH |
4b8a1a28 | 309 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 310 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
311 | previously attached to the inferior. It *might* work if we |
312 | started the process ourselves. */ | |
6e1e94ea | 313 | errno = 0; |
4b8a1a28 | 314 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 315 | if (errno != 0) |
e2e0b3e5 | 316 | perror_with_name (("ptrace")); |
6e1e94ea | 317 | #else |
8a3fe4f8 | 318 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 319 | #endif |
5bf970f9 AC |
320 | |
321 | inferior_ptid = null_ptid; | |
7f9f62ba | 322 | detach_inferior (pid); |
7a7d3353 PA |
323 | |
324 | if (!have_inferiors ()) | |
325 | unpush_target (ops); | |
5bf970f9 AC |
326 | } |
327 | ||
4b8a1a28 MK |
328 | /* Kill the inferior. */ |
329 | ||
5bf970f9 | 330 | static void |
7d85a9c0 | 331 | inf_ptrace_kill (struct target_ops *ops) |
5bf970f9 | 332 | { |
4b8a1a28 | 333 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 334 | int status; |
c7c14b96 MK |
335 | |
336 | if (pid == 0) | |
337 | return; | |
338 | ||
4b8a1a28 MK |
339 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
340 | waitpid (pid, &status, 0); | |
341 | ||
c7c14b96 | 342 | target_mourn_inferior (); |
5bf970f9 AC |
343 | } |
344 | ||
4b8a1a28 | 345 | /* Stop the inferior. */ |
c7c14b96 | 346 | |
5bf970f9 | 347 | static void |
94cc34af | 348 | inf_ptrace_stop (ptid_t ptid) |
5bf970f9 | 349 | { |
4b8a1a28 MK |
350 | /* Send a SIGINT to the process group. This acts just like the user |
351 | typed a ^C on the controlling terminal. Note that using a | |
352 | negative process number in kill() is a System V-ism. The proper | |
353 | BSD interface is killpg(). However, all modern BSDs support the | |
354 | System V interface too. */ | |
7e1789f5 | 355 | kill (-inferior_process_group (), SIGINT); |
5bf970f9 AC |
356 | } |
357 | ||
4b8a1a28 MK |
358 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
359 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
360 | that signal. */ | |
5bf970f9 AC |
361 | |
362 | static void | |
28439f5e PA |
363 | inf_ptrace_resume (struct target_ops *ops, |
364 | ptid_t ptid, int step, enum target_signal signal) | |
5bf970f9 | 365 | { |
4b8a1a28 | 366 | pid_t pid = ptid_get_pid (ptid); |
c7c14b96 | 367 | int request = PT_CONTINUE; |
c7c14b96 MK |
368 | |
369 | if (pid == -1) | |
4b8a1a28 MK |
370 | /* Resume all threads. Traditionally ptrace() only supports |
371 | single-threaded processes, so simply resume the inferior. */ | |
372 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 MK |
373 | |
374 | if (step) | |
375 | { | |
376 | /* If this system does not support PT_STEP, a higher level | |
377 | function will have called single_step() to transmute the step | |
378 | request into a continue request (by setting breakpoints on | |
379 | all possible successor instructions), so we don't have to | |
380 | worry about that here. */ | |
381 | request = PT_STEP; | |
382 | } | |
383 | ||
384 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
385 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 386 | already written a new program counter value to the child. */ |
c7c14b96 | 387 | errno = 0; |
4b8a1a28 | 388 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, target_signal_to_host (signal)); |
c7c14b96 MK |
389 | if (errno != 0) |
390 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
391 | } |
392 | ||
4b8a1a28 MK |
393 | /* Wait for the child specified by PTID to do something. Return the |
394 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
395 | the status in *OURSTATUS. */ | |
5bf970f9 | 396 | |
c7c14b96 | 397 | static ptid_t |
117de6a9 | 398 | inf_ptrace_wait (struct target_ops *ops, |
47608cb1 | 399 | ptid_t ptid, struct target_waitstatus *ourstatus, int options) |
5bf970f9 | 400 | { |
4b8a1a28 MK |
401 | pid_t pid; |
402 | int status, save_errno; | |
5bf970f9 | 403 | |
c7c14b96 MK |
404 | do |
405 | { | |
4b8a1a28 | 406 | set_sigint_trap (); |
5bf970f9 | 407 | |
4b8a1a28 MK |
408 | do |
409 | { | |
410 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
411 | save_errno = errno; | |
412 | } | |
413 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 414 | |
c7c14b96 | 415 | clear_sigint_trap (); |
5bf970f9 | 416 | |
c7c14b96 MK |
417 | if (pid == -1) |
418 | { | |
c7c14b96 | 419 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 420 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
421 | safe_strerror (save_errno)); |
422 | ||
423 | /* Claim it exited with unknown signal. */ | |
424 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
425 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
fb66883a | 426 | return inferior_ptid; |
c7c14b96 MK |
427 | } |
428 | ||
4b8a1a28 MK |
429 | /* Ignore terminated detached child processes. */ |
430 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
431 | pid = -1; | |
c7c14b96 | 432 | } |
4b8a1a28 | 433 | while (pid == -1); |
c7c14b96 | 434 | |
735f54b4 MK |
435 | #ifdef PT_GET_PROCESS_STATE |
436 | if (WIFSTOPPED (status)) | |
437 | { | |
438 | ptrace_state_t pe; | |
439 | pid_t fpid; | |
440 | ||
441 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
442 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
443 | perror_with_name (("ptrace")); | |
444 | ||
445 | switch (pe.pe_report_event) | |
446 | { | |
447 | case PTRACE_FORK: | |
448 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 449 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
450 | |
451 | /* Make sure the other end of the fork is stopped too. */ | |
452 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
453 | if (fpid == -1) | |
454 | perror_with_name (("waitpid")); | |
455 | ||
456 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
457 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
458 | perror_with_name (("ptrace")); | |
459 | ||
460 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
461 | gdb_assert (pe.pe_other_pid == pid); | |
462 | if (fpid == ptid_get_pid (inferior_ptid)) | |
463 | { | |
3a3e9ee3 | 464 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
465 | return pid_to_ptid (fpid); |
466 | } | |
467 | ||
468 | return pid_to_ptid (pid); | |
469 | } | |
470 | } | |
471 | #endif | |
472 | ||
c7c14b96 MK |
473 | store_waitstatus (ourstatus, status); |
474 | return pid_to_ptid (pid); | |
5bf970f9 AC |
475 | } |
476 | ||
4b8a1a28 MK |
477 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
478 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. | |
479 | Return the number of bytes actually transferred. */ | |
5bf970f9 AC |
480 | |
481 | static LONGEST | |
482 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
961cb7b5 MK |
483 | const char *annex, gdb_byte *readbuf, |
484 | const gdb_byte *writebuf, | |
485 | ULONGEST offset, LONGEST len) | |
5bf970f9 | 486 | { |
4b8a1a28 MK |
487 | pid_t pid = ptid_get_pid (inferior_ptid); |
488 | ||
5bf970f9 AC |
489 | switch (object) |
490 | { | |
491 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
492 | #ifdef PT_IO |
493 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
494 | request that promises to be much more efficient in reading | |
495 | and writing data in the traced process's address space. */ | |
496 | { | |
497 | struct ptrace_io_desc piod; | |
4b8a1a28 | 498 | |
f929a579 | 499 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
500 | for instruction and data. However, on OpenBSD 3.9 and |
501 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
502 | mapped read-only. Since most code segments will be | |
503 | read-only, using PIOD_WRITE_D will prevent us from | |
504 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
505 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
506 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
507 | piod.piod_offs = (void *) (long) offset; | |
508 | piod.piod_len = len; | |
509 | ||
510 | errno = 0; | |
4b8a1a28 | 511 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
f929a579 AC |
512 | /* Return the actual number of bytes read or written. */ |
513 | return piod.piod_len; | |
514 | /* If the PT_IO request is somehow not supported, fallback on | |
515 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
516 | to indicate failure. */ | |
517 | if (errno != EINVAL) | |
518 | return 0; | |
519 | } | |
520 | #endif | |
521 | { | |
522 | union | |
523 | { | |
524 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 525 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
526 | } buffer; |
527 | ULONGEST rounded_offset; | |
528 | LONGEST partial_len; | |
4b8a1a28 | 529 | |
cb85a953 AC |
530 | /* Round the start offset down to the next long word |
531 | boundary. */ | |
f929a579 | 532 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 533 | |
cb85a953 AC |
534 | /* Since ptrace will transfer a single word starting at that |
535 | rounded_offset the partial_len needs to be adjusted down to | |
536 | that (remember this function only does a single transfer). | |
537 | Should the required length be even less, adjust it down | |
538 | again. */ | |
539 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
540 | if (partial_len > len) | |
f929a579 | 541 | partial_len = len; |
4b8a1a28 | 542 | |
f929a579 AC |
543 | if (writebuf) |
544 | { | |
cb85a953 AC |
545 | /* If OFFSET:PARTIAL_LEN is smaller than |
546 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
547 | be needed. Read in the entire word. */ | |
f929a579 | 548 | if (rounded_offset < offset |
cb85a953 AC |
549 | || (offset + partial_len |
550 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 551 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 552 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
553 | (PTRACE_TYPE_ARG3)(uintptr_t) |
554 | rounded_offset, 0); | |
4b8a1a28 | 555 | |
f929a579 AC |
556 | /* Copy data to be written over corresponding part of |
557 | buffer. */ | |
f6ffd89b MK |
558 | memcpy (buffer.byte + (offset - rounded_offset), |
559 | writebuf, partial_len); | |
4b8a1a28 | 560 | |
f929a579 | 561 | errno = 0; |
4b8a1a28 | 562 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
563 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
564 | buffer.word); | |
f929a579 AC |
565 | if (errno) |
566 | { | |
567 | /* Using the appropriate one (I or D) is necessary for | |
568 | Gould NP1, at least. */ | |
569 | errno = 0; | |
4b8a1a28 | 570 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
571 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
572 | buffer.word); | |
f929a579 AC |
573 | if (errno) |
574 | return 0; | |
575 | } | |
576 | } | |
4b8a1a28 | 577 | |
f929a579 AC |
578 | if (readbuf) |
579 | { | |
580 | errno = 0; | |
4b8a1a28 | 581 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
582 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
583 | 0); | |
f929a579 AC |
584 | if (errno) |
585 | return 0; | |
586 | /* Copy appropriate bytes out of the buffer. */ | |
587 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
588 | partial_len); | |
589 | } | |
4b8a1a28 | 590 | |
f929a579 AC |
591 | return partial_len; |
592 | } | |
5bf970f9 AC |
593 | |
594 | case TARGET_OBJECT_UNWIND_TABLE: | |
595 | return -1; | |
596 | ||
597 | case TARGET_OBJECT_AUXV: | |
598 | return -1; | |
599 | ||
600 | case TARGET_OBJECT_WCOOKIE: | |
601 | return -1; | |
602 | ||
603 | default: | |
604 | return -1; | |
605 | } | |
606 | } | |
607 | ||
4b8a1a28 | 608 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
609 | |
610 | static int | |
28439f5e | 611 | inf_ptrace_thread_alive (struct target_ops *ops, ptid_t ptid) |
c7c14b96 | 612 | { |
4b8a1a28 MK |
613 | /* ??? Is kill the right way to do this? */ |
614 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
615 | } |
616 | ||
617 | /* Print status information about what we're accessing. */ | |
618 | ||
619 | static void | |
620 | inf_ptrace_files_info (struct target_ops *ignore) | |
621 | { | |
181e7f93 PA |
622 | struct inferior *inf = current_inferior (); |
623 | ||
4b8a1a28 | 624 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
181e7f93 | 625 | inf->attach_flag ? "attached" : "child", |
4b8a1a28 | 626 | target_pid_to_str (inferior_ptid)); |
5bf970f9 AC |
627 | } |
628 | ||
117de6a9 PA |
629 | static char * |
630 | inf_ptrace_pid_to_str (struct target_ops *ops, ptid_t ptid) | |
631 | { | |
632 | return normal_pid_to_str (ptid); | |
633 | } | |
634 | ||
8785ced0 MK |
635 | /* Create a prototype ptrace target. The client can override it with |
636 | local methods. */ | |
637 | ||
5bf970f9 AC |
638 | struct target_ops * |
639 | inf_ptrace_target (void) | |
640 | { | |
641 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 642 | |
5bf970f9 | 643 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
644 | t->to_detach = inf_ptrace_detach; |
645 | t->to_resume = inf_ptrace_resume; | |
646 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 647 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 648 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 649 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
650 | #ifdef PT_GET_PROCESS_STATE |
651 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
652 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
653 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 654 | #endif |
5bf970f9 | 655 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 656 | t->to_thread_alive = inf_ptrace_thread_alive; |
117de6a9 | 657 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
5bf970f9 | 658 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 659 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
8785ced0 MK |
660 | |
661 | return t; | |
662 | } | |
663 | \f | |
664 | ||
4b8a1a28 | 665 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 666 | where a particular register is stored. */ |
7714d83a | 667 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
668 | |
669 | /* Fetch register REGNUM from the inferior. */ | |
670 | ||
671 | static void | |
56be3814 | 672 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 673 | { |
3b3b1423 | 674 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
675 | CORE_ADDR addr; |
676 | size_t size; | |
677 | PTRACE_TYPE_RET *buf; | |
678 | int pid, i; | |
679 | ||
7714d83a | 680 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 681 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 682 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 683 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 684 | { |
56be3814 | 685 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
686 | return; |
687 | } | |
688 | ||
8785ced0 | 689 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 690 | separate processes. */ |
8785ced0 MK |
691 | pid = ptid_get_lwp (inferior_ptid); |
692 | if (pid == 0) | |
693 | pid = ptid_get_pid (inferior_ptid); | |
694 | ||
3b3b1423 | 695 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
696 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
697 | buf = alloca (size); | |
698 | ||
10d6c8cd | 699 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
700 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
701 | { | |
702 | errno = 0; | |
f7dd0ed7 | 703 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 704 | if (errno != 0) |
4b8a1a28 | 705 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 706 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 707 | regnum, safe_strerror (errno)); |
8785ced0 MK |
708 | |
709 | addr += sizeof (PTRACE_TYPE_RET); | |
710 | } | |
56be3814 | 711 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
712 | } |
713 | ||
714 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
715 | for all registers. */ | |
716 | ||
717 | static void | |
28439f5e PA |
718 | inf_ptrace_fetch_registers (struct target_ops *ops, |
719 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
720 | { |
721 | if (regnum == -1) | |
3b3b1423 UW |
722 | for (regnum = 0; |
723 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
724 | regnum++) | |
56be3814 | 725 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 726 | else |
56be3814 | 727 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
728 | } |
729 | ||
730 | /* Store register REGNUM into the inferior. */ | |
731 | ||
732 | static void | |
56be3814 | 733 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 734 | { |
3b3b1423 | 735 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
736 | CORE_ADDR addr; |
737 | size_t size; | |
738 | PTRACE_TYPE_RET *buf; | |
739 | int pid, i; | |
740 | ||
7714d83a | 741 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 742 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 743 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 744 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
745 | return; |
746 | ||
8785ced0 | 747 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 748 | separate processes. */ |
8785ced0 MK |
749 | pid = ptid_get_lwp (inferior_ptid); |
750 | if (pid == 0) | |
751 | pid = ptid_get_pid (inferior_ptid); | |
752 | ||
3b3b1423 | 753 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
754 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
755 | buf = alloca (size); | |
756 | ||
10d6c8cd | 757 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 758 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
759 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
760 | { | |
761 | errno = 0; | |
f7dd0ed7 | 762 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 763 | if (errno != 0) |
4b8a1a28 | 764 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 765 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 766 | regnum, safe_strerror (errno)); |
8785ced0 MK |
767 | |
768 | addr += sizeof (PTRACE_TYPE_RET); | |
769 | } | |
770 | } | |
771 | ||
772 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
773 | this for all registers. */ | |
774 | ||
2c0b251b | 775 | static void |
28439f5e PA |
776 | inf_ptrace_store_registers (struct target_ops *ops, |
777 | struct regcache *regcache, int regnum) | |
8785ced0 MK |
778 | { |
779 | if (regnum == -1) | |
3b3b1423 UW |
780 | for (regnum = 0; |
781 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
782 | regnum++) | |
56be3814 | 783 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 784 | else |
56be3814 | 785 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
786 | } |
787 | ||
788 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
789 | a function returning the offset within the user area where a | |
790 | particular register is stored. */ | |
791 | ||
792 | struct target_ops * | |
7714d83a UW |
793 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
794 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
795 | { |
796 | struct target_ops *t = inf_ptrace_target(); | |
797 | ||
798 | gdb_assert (register_u_offset); | |
799 | inf_ptrace_register_u_offset = register_u_offset; | |
800 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
801 | t->to_store_registers = inf_ptrace_store_registers; | |
802 | ||
5bf970f9 AC |
803 | return t; |
804 | } |