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