]>
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, |
9b254dd1 | 4 | 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008 |
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 | ||
2c4a536d | 35 | #include "inf-child.h" |
af990527 | 36 | #include "gdbthread.h" |
2c4a536d MK |
37 | |
38 | /* HACK: Save the ptrace ops returned by inf_ptrace_target. */ | |
5bf970f9 | 39 | static struct target_ops *ptrace_ops_hack; |
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; | |
735f54b4 | 78 | |
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. */ | |
87 | detach_breakpoints (pid); | |
735f54b4 MK |
88 | |
89 | if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
90 | perror_with_name (("ptrace")); | |
4e1c45ea PA |
91 | |
92 | /* Delete the parent. */ | |
93 | delete_thread_silent (last_tp->ptid); | |
94 | ||
95 | /* Add the child. */ | |
96 | inferior_ptid = pid_to_ptid (fpid); | |
97 | tp = add_thread_silent (inferior_ptid); | |
98 | ||
99 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
100 | tp->step_range_start = step_range_start; | |
101 | tp->step_range_end = step_range_end; | |
102 | tp->step_frame_id = step_frame_id; | |
103 | ||
104 | /* Reset breakpoints in the child as appropriate. */ | |
105 | follow_inferior_reset_breakpoints (); | |
735f54b4 MK |
106 | } |
107 | else | |
108 | { | |
109 | inferior_ptid = pid_to_ptid (pid); | |
110 | detach_breakpoints (fpid); | |
111 | ||
112 | if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1) | |
113 | perror_with_name (("ptrace")); | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | #endif /* PT_GET_PROCESS_STATE */ | |
120 | \f | |
121 | ||
4b8a1a28 | 122 | /* Prepare to be traced. */ |
5bf970f9 AC |
123 | |
124 | static void | |
c7c14b96 | 125 | inf_ptrace_me (void) |
5bf970f9 | 126 | { |
c7c14b96 | 127 | /* "Trace me, Dr. Memory!" */ |
4b8a1a28 | 128 | ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0); |
5bf970f9 AC |
129 | } |
130 | ||
4b8a1a28 | 131 | /* Start tracing PID. */ |
5bf970f9 AC |
132 | |
133 | static void | |
c7c14b96 | 134 | inf_ptrace_him (int pid) |
5bf970f9 | 135 | { |
c7c14b96 | 136 | push_target (ptrace_ops_hack); |
5bf970f9 | 137 | |
c7c14b96 MK |
138 | /* On some targets, there must be some explicit synchronization |
139 | between the parent and child processes after the debugger | |
140 | forks, and before the child execs the debuggee program. This | |
141 | call basically gives permission for the child to exec. */ | |
5bf970f9 | 142 | |
c7c14b96 | 143 | target_acknowledge_created_inferior (pid); |
5bf970f9 | 144 | |
c7c14b96 MK |
145 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
146 | be 1 or 2 depending on whether we're starting without or with a | |
147 | shell. */ | |
148 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); | |
149 | ||
150 | /* On some targets, there must be some explicit actions taken after | |
151 | the inferior has been started up. */ | |
152 | target_post_startup_inferior (pid_to_ptid (pid)); | |
5bf970f9 AC |
153 | } |
154 | ||
4b8a1a28 MK |
155 | /* Start a new inferior Unix child process. EXEC_FILE is the file to |
156 | run, ALLARGS is a string containing the arguments to the program. | |
157 | ENV is the environment vector to pass. If FROM_TTY is non-zero, be | |
158 | chatty about it. */ | |
5bf970f9 | 159 | |
c7c14b96 MK |
160 | static void |
161 | inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env, | |
162 | int from_tty) | |
5bf970f9 | 163 | { |
c7c14b96 MK |
164 | fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him, |
165 | NULL, NULL); | |
5bf970f9 AC |
166 | } |
167 | ||
e4ef629d MK |
168 | #ifdef PT_GET_PROCESS_STATE |
169 | ||
170 | static void | |
171 | inf_ptrace_post_startup_inferior (ptid_t pid) | |
172 | { | |
173 | ptrace_event_t pe; | |
174 | ||
175 | /* Set the initial event mask. */ | |
176 | memset (&pe, 0, sizeof pe); | |
177 | pe.pe_set_event |= PTRACE_FORK; | |
178 | if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid), | |
179 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
180 | perror_with_name (("ptrace")); | |
181 | } | |
182 | ||
183 | #endif | |
184 | ||
4b8a1a28 MK |
185 | /* Clean up a rotting corpse of an inferior after it died. */ |
186 | ||
c7c14b96 MK |
187 | static void |
188 | inf_ptrace_mourn_inferior (void) | |
5bf970f9 | 189 | { |
4b8a1a28 MK |
190 | int status; |
191 | ||
192 | /* Wait just one more time to collect the inferior's exit status. | |
f010475d | 193 | Do not check whether this succeeds though, since we may be |
4b8a1a28 | 194 | dealing with a process that we attached to. Such a process will |
3d450bdd | 195 | only report its exit status to its original parent. */ |
4b8a1a28 MK |
196 | waitpid (ptid_get_pid (inferior_ptid), &status, 0); |
197 | ||
c7c14b96 MK |
198 | unpush_target (ptrace_ops_hack); |
199 | generic_mourn_inferior (); | |
5bf970f9 AC |
200 | } |
201 | ||
4b8a1a28 MK |
202 | /* Attach to the process specified by ARGS. If FROM_TTY is non-zero, |
203 | be chatty about it. */ | |
5bf970f9 AC |
204 | |
205 | static void | |
206 | inf_ptrace_attach (char *args, int from_tty) | |
207 | { | |
208 | char *exec_file; | |
4b8a1a28 | 209 | pid_t pid; |
5bf970f9 AC |
210 | char *dummy; |
211 | ||
212 | if (!args) | |
e2e0b3e5 | 213 | error_no_arg (_("process-id to attach")); |
5bf970f9 AC |
214 | |
215 | dummy = args; | |
216 | pid = strtol (args, &dummy, 0); | |
f6ffd89b | 217 | /* Some targets don't set errno on errors, grrr! */ |
6e1e94ea | 218 | if (pid == 0 && args == dummy) |
8a3fe4f8 | 219 | error (_("Illegal process-id: %s."), args); |
5bf970f9 | 220 | |
f6ffd89b | 221 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 222 | error (_("I refuse to debug myself!")); |
5bf970f9 AC |
223 | |
224 | if (from_tty) | |
225 | { | |
4b8a1a28 | 226 | exec_file = get_exec_file (0); |
5bf970f9 AC |
227 | |
228 | if (exec_file) | |
a3f17187 | 229 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
230 | target_pid_to_str (pid_to_ptid (pid))); |
231 | else | |
a3f17187 | 232 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
233 | target_pid_to_str (pid_to_ptid (pid))); |
234 | ||
235 | gdb_flush (gdb_stdout); | |
236 | } | |
237 | ||
6e1e94ea MK |
238 | #ifdef PT_ATTACH |
239 | errno = 0; | |
4b8a1a28 | 240 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0); |
6e1e94ea | 241 | if (errno != 0) |
e2e0b3e5 | 242 | perror_with_name (("ptrace")); |
6e1e94ea MK |
243 | attach_flag = 1; |
244 | #else | |
8a3fe4f8 | 245 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 246 | #endif |
5bf970f9 AC |
247 | |
248 | inferior_ptid = pid_to_ptid (pid); | |
af990527 PA |
249 | |
250 | /* Always add a main thread. If some target extends the ptrace | |
251 | target, it should decorate the ptid later with more info. */ | |
252 | add_thread_silent (inferior_ptid); | |
253 | ||
5bf970f9 AC |
254 | push_target (ptrace_ops_hack); |
255 | } | |
256 | ||
e4ef629d MK |
257 | #ifdef PT_GET_PROCESS_STATE |
258 | ||
259 | void | |
260 | inf_ptrace_post_attach (int pid) | |
261 | { | |
262 | ptrace_event_t pe; | |
263 | ||
264 | /* Set the initial event mask. */ | |
265 | memset (&pe, 0, sizeof pe); | |
266 | pe.pe_set_event |= PTRACE_FORK; | |
267 | if (ptrace (PT_SET_EVENT_MASK, pid, | |
268 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
269 | perror_with_name (("ptrace")); | |
270 | } | |
271 | ||
272 | #endif | |
273 | ||
4b8a1a28 | 274 | /* Detach from the inferior, optionally passing it the signal |
f010475d | 275 | specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */ |
5bf970f9 AC |
276 | |
277 | static void | |
278 | inf_ptrace_detach (char *args, int from_tty) | |
279 | { | |
4b8a1a28 | 280 | pid_t pid = ptid_get_pid (inferior_ptid); |
6e1e94ea | 281 | int sig = 0; |
5bf970f9 AC |
282 | |
283 | if (from_tty) | |
284 | { | |
285 | char *exec_file = get_exec_file (0); | |
286 | if (exec_file == 0) | |
287 | exec_file = ""; | |
a3f17187 | 288 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
289 | target_pid_to_str (pid_to_ptid (pid))); |
290 | gdb_flush (gdb_stdout); | |
291 | } | |
292 | if (args) | |
6e1e94ea | 293 | sig = atoi (args); |
5bf970f9 | 294 | |
6e1e94ea | 295 | #ifdef PT_DETACH |
4b8a1a28 | 296 | /* We'd better not have left any breakpoints in the program or it'll |
f010475d | 297 | die when it hits one. Also note that this may only work if we |
4b8a1a28 MK |
298 | previously attached to the inferior. It *might* work if we |
299 | started the process ourselves. */ | |
6e1e94ea | 300 | errno = 0; |
4b8a1a28 | 301 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig); |
6e1e94ea | 302 | if (errno != 0) |
e2e0b3e5 | 303 | perror_with_name (("ptrace")); |
6e1e94ea MK |
304 | attach_flag = 0; |
305 | #else | |
8a3fe4f8 | 306 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 307 | #endif |
5bf970f9 AC |
308 | |
309 | inferior_ptid = null_ptid; | |
310 | unpush_target (ptrace_ops_hack); | |
311 | } | |
312 | ||
4b8a1a28 MK |
313 | /* Kill the inferior. */ |
314 | ||
5bf970f9 | 315 | static void |
4b8a1a28 | 316 | inf_ptrace_kill (void) |
5bf970f9 | 317 | { |
4b8a1a28 | 318 | pid_t pid = ptid_get_pid (inferior_ptid); |
c7c14b96 | 319 | int status; |
c7c14b96 MK |
320 | |
321 | if (pid == 0) | |
322 | return; | |
323 | ||
4b8a1a28 MK |
324 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0); |
325 | waitpid (pid, &status, 0); | |
326 | ||
c7c14b96 | 327 | target_mourn_inferior (); |
5bf970f9 AC |
328 | } |
329 | ||
4b8a1a28 | 330 | /* Stop the inferior. */ |
c7c14b96 | 331 | |
5bf970f9 | 332 | static void |
94cc34af | 333 | inf_ptrace_stop (ptid_t ptid) |
5bf970f9 | 334 | { |
4b8a1a28 MK |
335 | /* Send a SIGINT to the process group. This acts just like the user |
336 | typed a ^C on the controlling terminal. Note that using a | |
337 | negative process number in kill() is a System V-ism. The proper | |
338 | BSD interface is killpg(). However, all modern BSDs support the | |
339 | System V interface too. */ | |
c7c14b96 | 340 | kill (-inferior_process_group, SIGINT); |
5bf970f9 AC |
341 | } |
342 | ||
4b8a1a28 MK |
343 | /* Resume execution of thread PTID, or all threads if PTID is -1. If |
344 | STEP is nonzero, single-step it. If SIGNAL is nonzero, give it | |
345 | that signal. */ | |
5bf970f9 AC |
346 | |
347 | static void | |
c7c14b96 | 348 | inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal) |
5bf970f9 | 349 | { |
4b8a1a28 | 350 | pid_t pid = ptid_get_pid (ptid); |
c7c14b96 | 351 | int request = PT_CONTINUE; |
c7c14b96 MK |
352 | |
353 | if (pid == -1) | |
4b8a1a28 MK |
354 | /* Resume all threads. Traditionally ptrace() only supports |
355 | single-threaded processes, so simply resume the inferior. */ | |
356 | pid = ptid_get_pid (inferior_ptid); | |
c7c14b96 MK |
357 | |
358 | if (step) | |
359 | { | |
360 | /* If this system does not support PT_STEP, a higher level | |
361 | function will have called single_step() to transmute the step | |
362 | request into a continue request (by setting breakpoints on | |
363 | all possible successor instructions), so we don't have to | |
364 | worry about that here. */ | |
365 | request = PT_STEP; | |
366 | } | |
367 | ||
368 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
369 | where it was. If GDB wanted it to start some other way, we have | |
4b8a1a28 | 370 | already written a new program counter value to the child. */ |
c7c14b96 | 371 | errno = 0; |
4b8a1a28 | 372 | ptrace (request, pid, (PTRACE_TYPE_ARG3)1, target_signal_to_host (signal)); |
c7c14b96 MK |
373 | if (errno != 0) |
374 | perror_with_name (("ptrace")); | |
5bf970f9 AC |
375 | } |
376 | ||
4b8a1a28 MK |
377 | /* Wait for the child specified by PTID to do something. Return the |
378 | process ID of the child, or MINUS_ONE_PTID in case of error; store | |
379 | the status in *OURSTATUS. */ | |
5bf970f9 | 380 | |
c7c14b96 MK |
381 | static ptid_t |
382 | inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
5bf970f9 | 383 | { |
4b8a1a28 MK |
384 | pid_t pid; |
385 | int status, save_errno; | |
5bf970f9 | 386 | |
c7c14b96 MK |
387 | do |
388 | { | |
4b8a1a28 | 389 | set_sigint_trap (); |
c7c14b96 | 390 | set_sigio_trap (); |
5bf970f9 | 391 | |
4b8a1a28 MK |
392 | do |
393 | { | |
394 | pid = waitpid (ptid_get_pid (ptid), &status, 0); | |
395 | save_errno = errno; | |
396 | } | |
397 | while (pid == -1 && errno == EINTR); | |
5bf970f9 | 398 | |
c7c14b96 | 399 | clear_sigio_trap (); |
c7c14b96 | 400 | clear_sigint_trap (); |
5bf970f9 | 401 | |
c7c14b96 MK |
402 | if (pid == -1) |
403 | { | |
c7c14b96 | 404 | fprintf_unfiltered (gdb_stderr, |
4b8a1a28 | 405 | _("Child process unexpectedly missing: %s.\n"), |
c7c14b96 MK |
406 | safe_strerror (save_errno)); |
407 | ||
408 | /* Claim it exited with unknown signal. */ | |
409 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
410 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
4b8a1a28 | 411 | return minus_one_ptid; |
c7c14b96 MK |
412 | } |
413 | ||
4b8a1a28 MK |
414 | /* Ignore terminated detached child processes. */ |
415 | if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid)) | |
416 | pid = -1; | |
c7c14b96 | 417 | } |
4b8a1a28 | 418 | while (pid == -1); |
c7c14b96 | 419 | |
735f54b4 MK |
420 | #ifdef PT_GET_PROCESS_STATE |
421 | if (WIFSTOPPED (status)) | |
422 | { | |
423 | ptrace_state_t pe; | |
424 | pid_t fpid; | |
425 | ||
426 | if (ptrace (PT_GET_PROCESS_STATE, pid, | |
427 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
428 | perror_with_name (("ptrace")); | |
429 | ||
430 | switch (pe.pe_report_event) | |
431 | { | |
432 | case PTRACE_FORK: | |
433 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
3a3e9ee3 | 434 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
435 | |
436 | /* Make sure the other end of the fork is stopped too. */ | |
437 | fpid = waitpid (pe.pe_other_pid, &status, 0); | |
438 | if (fpid == -1) | |
439 | perror_with_name (("waitpid")); | |
440 | ||
441 | if (ptrace (PT_GET_PROCESS_STATE, fpid, | |
442 | (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1) | |
443 | perror_with_name (("ptrace")); | |
444 | ||
445 | gdb_assert (pe.pe_report_event == PTRACE_FORK); | |
446 | gdb_assert (pe.pe_other_pid == pid); | |
447 | if (fpid == ptid_get_pid (inferior_ptid)) | |
448 | { | |
3a3e9ee3 | 449 | ourstatus->value.related_pid = pid_to_ptid (pe.pe_other_pid); |
735f54b4 MK |
450 | return pid_to_ptid (fpid); |
451 | } | |
452 | ||
453 | return pid_to_ptid (pid); | |
454 | } | |
455 | } | |
456 | #endif | |
457 | ||
c7c14b96 MK |
458 | store_waitstatus (ourstatus, status); |
459 | return pid_to_ptid (pid); | |
5bf970f9 AC |
460 | } |
461 | ||
4b8a1a28 MK |
462 | /* Attempt a transfer all LEN bytes starting at OFFSET between the |
463 | inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer. | |
464 | Return the number of bytes actually transferred. */ | |
5bf970f9 AC |
465 | |
466 | static LONGEST | |
467 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
961cb7b5 MK |
468 | const char *annex, gdb_byte *readbuf, |
469 | const gdb_byte *writebuf, | |
470 | ULONGEST offset, LONGEST len) | |
5bf970f9 | 471 | { |
4b8a1a28 MK |
472 | pid_t pid = ptid_get_pid (inferior_ptid); |
473 | ||
5bf970f9 AC |
474 | switch (object) |
475 | { | |
476 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
477 | #ifdef PT_IO |
478 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
479 | request that promises to be much more efficient in reading | |
480 | and writing data in the traced process's address space. */ | |
481 | { | |
482 | struct ptrace_io_desc piod; | |
4b8a1a28 | 483 | |
f929a579 | 484 | /* NOTE: We assume that there are no distinct address spaces |
b457b3dd MK |
485 | for instruction and data. However, on OpenBSD 3.9 and |
486 | later, PIOD_WRITE_D doesn't allow changing memory that's | |
487 | mapped read-only. Since most code segments will be | |
488 | read-only, using PIOD_WRITE_D will prevent us from | |
489 | inserting breakpoints, so we use PIOD_WRITE_I instead. */ | |
490 | piod.piod_op = writebuf ? PIOD_WRITE_I : PIOD_READ_D; | |
f929a579 AC |
491 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; |
492 | piod.piod_offs = (void *) (long) offset; | |
493 | piod.piod_len = len; | |
494 | ||
495 | errno = 0; | |
4b8a1a28 | 496 | if (ptrace (PT_IO, pid, (caddr_t)&piod, 0) == 0) |
f929a579 AC |
497 | /* Return the actual number of bytes read or written. */ |
498 | return piod.piod_len; | |
499 | /* If the PT_IO request is somehow not supported, fallback on | |
500 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
501 | to indicate failure. */ | |
502 | if (errno != EINVAL) | |
503 | return 0; | |
504 | } | |
505 | #endif | |
506 | { | |
507 | union | |
508 | { | |
509 | PTRACE_TYPE_RET word; | |
4b8a1a28 | 510 | gdb_byte byte[sizeof (PTRACE_TYPE_RET)]; |
f929a579 AC |
511 | } buffer; |
512 | ULONGEST rounded_offset; | |
513 | LONGEST partial_len; | |
4b8a1a28 | 514 | |
cb85a953 AC |
515 | /* Round the start offset down to the next long word |
516 | boundary. */ | |
f929a579 | 517 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
4b8a1a28 | 518 | |
cb85a953 AC |
519 | /* Since ptrace will transfer a single word starting at that |
520 | rounded_offset the partial_len needs to be adjusted down to | |
521 | that (remember this function only does a single transfer). | |
522 | Should the required length be even less, adjust it down | |
523 | again. */ | |
524 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
525 | if (partial_len > len) | |
f929a579 | 526 | partial_len = len; |
4b8a1a28 | 527 | |
f929a579 AC |
528 | if (writebuf) |
529 | { | |
cb85a953 AC |
530 | /* If OFFSET:PARTIAL_LEN is smaller than |
531 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
532 | be needed. Read in the entire word. */ | |
f929a579 | 533 | if (rounded_offset < offset |
cb85a953 AC |
534 | || (offset + partial_len |
535 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 | 536 | /* Need part of initial word -- fetch it. */ |
4b8a1a28 | 537 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
538 | (PTRACE_TYPE_ARG3)(uintptr_t) |
539 | rounded_offset, 0); | |
4b8a1a28 | 540 | |
f929a579 AC |
541 | /* Copy data to be written over corresponding part of |
542 | buffer. */ | |
f6ffd89b MK |
543 | memcpy (buffer.byte + (offset - rounded_offset), |
544 | writebuf, partial_len); | |
4b8a1a28 | 545 | |
f929a579 | 546 | errno = 0; |
4b8a1a28 | 547 | ptrace (PT_WRITE_D, pid, |
f7dd0ed7 UW |
548 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
549 | buffer.word); | |
f929a579 AC |
550 | if (errno) |
551 | { | |
552 | /* Using the appropriate one (I or D) is necessary for | |
553 | Gould NP1, at least. */ | |
554 | errno = 0; | |
4b8a1a28 | 555 | ptrace (PT_WRITE_I, pid, |
f7dd0ed7 UW |
556 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
557 | buffer.word); | |
f929a579 AC |
558 | if (errno) |
559 | return 0; | |
560 | } | |
561 | } | |
4b8a1a28 | 562 | |
f929a579 AC |
563 | if (readbuf) |
564 | { | |
565 | errno = 0; | |
4b8a1a28 | 566 | buffer.word = ptrace (PT_READ_I, pid, |
f7dd0ed7 UW |
567 | (PTRACE_TYPE_ARG3)(uintptr_t)rounded_offset, |
568 | 0); | |
f929a579 AC |
569 | if (errno) |
570 | return 0; | |
571 | /* Copy appropriate bytes out of the buffer. */ | |
572 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
573 | partial_len); | |
574 | } | |
4b8a1a28 | 575 | |
f929a579 AC |
576 | return partial_len; |
577 | } | |
5bf970f9 AC |
578 | |
579 | case TARGET_OBJECT_UNWIND_TABLE: | |
580 | return -1; | |
581 | ||
582 | case TARGET_OBJECT_AUXV: | |
583 | return -1; | |
584 | ||
585 | case TARGET_OBJECT_WCOOKIE: | |
586 | return -1; | |
587 | ||
588 | default: | |
589 | return -1; | |
590 | } | |
591 | } | |
592 | ||
4b8a1a28 | 593 | /* Return non-zero if the thread specified by PTID is alive. */ |
c7c14b96 MK |
594 | |
595 | static int | |
596 | inf_ptrace_thread_alive (ptid_t ptid) | |
597 | { | |
4b8a1a28 MK |
598 | /* ??? Is kill the right way to do this? */ |
599 | return (kill (ptid_get_pid (ptid), 0) != -1); | |
c7c14b96 MK |
600 | } |
601 | ||
602 | /* Print status information about what we're accessing. */ | |
603 | ||
604 | static void | |
605 | inf_ptrace_files_info (struct target_ops *ignore) | |
606 | { | |
4b8a1a28 MK |
607 | printf_filtered (_("\tUsing the running image of %s %s.\n"), |
608 | attach_flag ? "attached" : "child", | |
609 | target_pid_to_str (inferior_ptid)); | |
5bf970f9 AC |
610 | } |
611 | ||
8785ced0 MK |
612 | /* Create a prototype ptrace target. The client can override it with |
613 | local methods. */ | |
614 | ||
5bf970f9 AC |
615 | struct target_ops * |
616 | inf_ptrace_target (void) | |
617 | { | |
618 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 619 | |
5bf970f9 | 620 | t->to_attach = inf_ptrace_attach; |
5bf970f9 AC |
621 | t->to_detach = inf_ptrace_detach; |
622 | t->to_resume = inf_ptrace_resume; | |
623 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 624 | t->to_files_info = inf_ptrace_files_info; |
4b8a1a28 | 625 | t->to_kill = inf_ptrace_kill; |
5bf970f9 | 626 | t->to_create_inferior = inf_ptrace_create_inferior; |
735f54b4 MK |
627 | #ifdef PT_GET_PROCESS_STATE |
628 | t->to_follow_fork = inf_ptrace_follow_fork; | |
e4ef629d MK |
629 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
630 | t->to_post_attach = inf_ptrace_post_attach; | |
735f54b4 | 631 | #endif |
5bf970f9 | 632 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
5bf970f9 | 633 | t->to_thread_alive = inf_ptrace_thread_alive; |
4b8a1a28 | 634 | t->to_pid_to_str = normal_pid_to_str; |
5bf970f9 | 635 | t->to_stop = inf_ptrace_stop; |
c7c14b96 | 636 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
8785ced0 | 637 | |
c7c14b96 | 638 | ptrace_ops_hack = t; |
8785ced0 MK |
639 | return t; |
640 | } | |
641 | \f | |
642 | ||
4b8a1a28 | 643 | /* Pointer to a function that returns the offset within the user area |
8785ced0 | 644 | where a particular register is stored. */ |
7714d83a | 645 | static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int); |
8785ced0 MK |
646 | |
647 | /* Fetch register REGNUM from the inferior. */ | |
648 | ||
649 | static void | |
56be3814 | 650 | inf_ptrace_fetch_register (struct regcache *regcache, int regnum) |
8785ced0 | 651 | { |
3b3b1423 | 652 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
653 | CORE_ADDR addr; |
654 | size_t size; | |
655 | PTRACE_TYPE_RET *buf; | |
656 | int pid, i; | |
657 | ||
7714d83a | 658 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 659 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0); |
8d4c1ba3 | 660 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 661 | || gdbarch_cannot_fetch_register (gdbarch, regnum)) |
10d6c8cd | 662 | { |
56be3814 | 663 | regcache_raw_supply (regcache, regnum, NULL); |
10d6c8cd DJ |
664 | return; |
665 | } | |
666 | ||
8785ced0 | 667 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 668 | separate processes. */ |
8785ced0 MK |
669 | pid = ptid_get_lwp (inferior_ptid); |
670 | if (pid == 0) | |
671 | pid = ptid_get_pid (inferior_ptid); | |
672 | ||
3b3b1423 | 673 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
674 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
675 | buf = alloca (size); | |
676 | ||
10d6c8cd | 677 | /* Read the register contents from the inferior a chunk at a time. */ |
8785ced0 MK |
678 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
679 | { | |
680 | errno = 0; | |
f7dd0ed7 | 681 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0); |
8785ced0 | 682 | if (errno != 0) |
4b8a1a28 | 683 | error (_("Couldn't read register %s (#%d): %s."), |
3b3b1423 | 684 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 685 | regnum, safe_strerror (errno)); |
8785ced0 MK |
686 | |
687 | addr += sizeof (PTRACE_TYPE_RET); | |
688 | } | |
56be3814 | 689 | regcache_raw_supply (regcache, regnum, buf); |
8785ced0 MK |
690 | } |
691 | ||
692 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
693 | for all registers. */ | |
694 | ||
695 | static void | |
56be3814 | 696 | inf_ptrace_fetch_registers (struct regcache *regcache, int regnum) |
8785ced0 MK |
697 | { |
698 | if (regnum == -1) | |
3b3b1423 UW |
699 | for (regnum = 0; |
700 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
701 | regnum++) | |
56be3814 | 702 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 | 703 | else |
56be3814 | 704 | inf_ptrace_fetch_register (regcache, regnum); |
8785ced0 MK |
705 | } |
706 | ||
707 | /* Store register REGNUM into the inferior. */ | |
708 | ||
709 | static void | |
56be3814 | 710 | inf_ptrace_store_register (const struct regcache *regcache, int regnum) |
8785ced0 | 711 | { |
3b3b1423 | 712 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
8785ced0 MK |
713 | CORE_ADDR addr; |
714 | size_t size; | |
715 | PTRACE_TYPE_RET *buf; | |
716 | int pid, i; | |
717 | ||
7714d83a | 718 | /* This isn't really an address, but ptrace thinks of it as one. */ |
3b3b1423 | 719 | addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1); |
8d4c1ba3 | 720 | if (addr == (CORE_ADDR)-1 |
3b3b1423 | 721 | || gdbarch_cannot_store_register (gdbarch, regnum)) |
10d6c8cd DJ |
722 | return; |
723 | ||
8785ced0 | 724 | /* Cater for systems like GNU/Linux, that implement threads as |
10d6c8cd | 725 | separate processes. */ |
8785ced0 MK |
726 | pid = ptid_get_lwp (inferior_ptid); |
727 | if (pid == 0) | |
728 | pid = ptid_get_pid (inferior_ptid); | |
729 | ||
3b3b1423 | 730 | size = register_size (gdbarch, regnum); |
8785ced0 MK |
731 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); |
732 | buf = alloca (size); | |
733 | ||
10d6c8cd | 734 | /* Write the register contents into the inferior a chunk at a time. */ |
56be3814 | 735 | regcache_raw_collect (regcache, regnum, buf); |
8785ced0 MK |
736 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) |
737 | { | |
738 | errno = 0; | |
f7dd0ed7 | 739 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]); |
8785ced0 | 740 | if (errno != 0) |
4b8a1a28 | 741 | error (_("Couldn't write register %s (#%d): %s."), |
3b3b1423 | 742 | gdbarch_register_name (gdbarch, regnum), |
c9f4d572 | 743 | regnum, safe_strerror (errno)); |
8785ced0 MK |
744 | |
745 | addr += sizeof (PTRACE_TYPE_RET); | |
746 | } | |
747 | } | |
748 | ||
749 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
750 | this for all registers. */ | |
751 | ||
752 | void | |
56be3814 | 753 | inf_ptrace_store_registers (struct regcache *regcache, int regnum) |
8785ced0 MK |
754 | { |
755 | if (regnum == -1) | |
3b3b1423 UW |
756 | for (regnum = 0; |
757 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); | |
758 | regnum++) | |
56be3814 | 759 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 | 760 | else |
56be3814 | 761 | inf_ptrace_store_register (regcache, regnum); |
8785ced0 MK |
762 | } |
763 | ||
764 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
765 | a function returning the offset within the user area where a | |
766 | particular register is stored. */ | |
767 | ||
768 | struct target_ops * | |
7714d83a UW |
769 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset) |
770 | (struct gdbarch *, int, int)) | |
8785ced0 MK |
771 | { |
772 | struct target_ops *t = inf_ptrace_target(); | |
773 | ||
774 | gdb_assert (register_u_offset); | |
775 | inf_ptrace_register_u_offset = register_u_offset; | |
776 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
777 | t->to_store_registers = inf_ptrace_store_registers; | |
778 | ||
5bf970f9 AC |
779 | return t; |
780 | } |