Commit | Line | Data |
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2c4a536d | 1 | /* Low-level child interface to ptrace. |
5bf970f9 AC |
2 | |
3 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, | |
8785ced0 MK |
4 | 1998, 1999, 2000, 2001, 2002, 2004, 2005 |
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 | |
11 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
5bf970f9 | 25 | #include "command.h" |
2c4a536d MK |
26 | #include "inferior.h" |
27 | #include "inflow.h" | |
5bf970f9 | 28 | #include "gdbcore.h" |
2c4a536d | 29 | #include "observer.h" |
8785ced0 | 30 | #include "regcache.h" |
5bf970f9 | 31 | |
8785ced0 | 32 | #include "gdb_assert.h" |
2c4a536d MK |
33 | #include "gdb_string.h" |
34 | #include "gdb_ptrace.h" | |
34a17005 | 35 | #include "gdb_wait.h" |
5bf970f9 AC |
36 | #include <signal.h> |
37 | ||
2c4a536d MK |
38 | #include "inf-child.h" |
39 | ||
40 | /* HACK: Save the ptrace ops returned by inf_ptrace_target. */ | |
5bf970f9 AC |
41 | static struct target_ops *ptrace_ops_hack; |
42 | ||
43 | static void | |
44 | inf_ptrace_kill_inferior (void) | |
45 | { | |
46 | int status; | |
47 | int pid = PIDGET (inferior_ptid); | |
48 | ||
49 | if (pid == 0) | |
50 | return; | |
51 | ||
52 | /* This once used to call "kill" to kill the inferior just in case | |
53 | the inferior was still running. As others have noted in the past | |
54 | (kingdon) there shouldn't be any way to get here if the inferior | |
f6ffd89b | 55 | is still running -- else there's a major problem elsewere in GDB |
5bf970f9 AC |
56 | and it needs to be fixed. |
57 | ||
f6ffd89b MK |
58 | The kill call causes problems under HP-UX 10, so it's been |
59 | removed; if this causes problems we'll deal with them as they | |
60 | arise. */ | |
62ece330 MK |
61 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
62 | wait (&status); | |
5bf970f9 AC |
63 | target_mourn_inferior (); |
64 | } | |
65 | ||
66 | /* Resume execution of the inferior process. If STEP is nonzero, | |
67 | single-step it. If SIGNAL is nonzero, give it that signal. */ | |
68 | ||
69 | static void | |
70 | inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal) | |
71 | { | |
72 | int request = PT_CONTINUE; | |
73 | int pid = PIDGET (ptid); | |
74 | ||
75 | if (pid == -1) | |
76 | /* Resume all threads. */ | |
77 | /* I think this only gets used in the non-threaded case, where | |
78 | "resume all threads" and "resume inferior_ptid" are the | |
79 | same. */ | |
80 | pid = PIDGET (inferior_ptid); | |
81 | ||
82 | if (step) | |
83 | { | |
84 | /* If this system does not support PT_STEP, a higher level | |
85 | function will have called single_step() to transmute the step | |
86 | request into a continue request (by setting breakpoints on | |
87 | all possible successor instructions), so we don't have to | |
88 | worry about that here. */ | |
89 | request = PT_STEP; | |
90 | } | |
91 | ||
92 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from | |
93 | where it was. If GDB wanted it to start some other way, we have | |
94 | already written a new PC value to the child. */ | |
95 | errno = 0; | |
96 | ptrace (request, pid, (PTRACE_TYPE_ARG3) 1, target_signal_to_host (signal)); | |
97 | if (errno != 0) | |
98 | perror_with_name ("ptrace"); | |
99 | } | |
100 | ||
5bf970f9 AC |
101 | /* Wait for child to do something. Return pid of child, or -1 in case |
102 | of error; store status through argument pointer OURSTATUS. */ | |
103 | ||
104 | static ptid_t | |
105 | inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus) | |
106 | { | |
107 | int save_errno; | |
108 | int status; | |
109 | char *execd_pathname = NULL; | |
110 | int exit_status; | |
111 | int related_pid; | |
112 | int syscall_id; | |
113 | enum target_waitkind kind; | |
114 | int pid; | |
115 | ||
116 | do | |
117 | { | |
118 | set_sigint_trap (); /* Causes SIGINT to be passed on to the | |
119 | attached process. */ | |
120 | set_sigio_trap (); | |
121 | ||
62ece330 | 122 | pid = wait (&status); |
5bf970f9 AC |
123 | |
124 | save_errno = errno; | |
125 | ||
126 | clear_sigio_trap (); | |
127 | ||
128 | clear_sigint_trap (); | |
129 | ||
130 | if (pid == -1) | |
131 | { | |
132 | if (save_errno == EINTR) | |
133 | continue; | |
134 | ||
135 | fprintf_unfiltered (gdb_stderr, | |
136 | "Child process unexpectedly missing: %s.\n", | |
137 | safe_strerror (save_errno)); | |
138 | ||
139 | /* Claim it exited with unknown signal. */ | |
140 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; | |
141 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; | |
142 | return pid_to_ptid (-1); | |
143 | } | |
144 | ||
f6ffd89b | 145 | /* Did it exit? */ |
5bf970f9 AC |
146 | if (target_has_exited (pid, status, &exit_status)) |
147 | { | |
148 | /* ??rehrauer: For now, ignore this. */ | |
149 | continue; | |
150 | } | |
151 | ||
152 | if (!target_thread_alive (pid_to_ptid (pid))) | |
153 | { | |
154 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
155 | return pid_to_ptid (pid); | |
156 | } | |
157 | } | |
f6ffd89b MK |
158 | while (pid != PIDGET (inferior_ptid)); /* Some other child died or |
159 | stopped. */ | |
5bf970f9 AC |
160 | |
161 | store_waitstatus (ourstatus, status); | |
162 | return pid_to_ptid (pid); | |
163 | } | |
164 | ||
5bf970f9 AC |
165 | /* Check to see if the given thread is alive. |
166 | ||
167 | FIXME: Is kill() ever the right way to do this? I doubt it, but | |
168 | for now we're going to try and be compatable with the old thread | |
169 | code. */ | |
170 | ||
171 | static int | |
172 | inf_ptrace_thread_alive (ptid_t ptid) | |
173 | { | |
174 | pid_t pid = PIDGET (ptid); | |
175 | ||
176 | return (kill (pid, 0) != -1); | |
177 | } | |
178 | ||
179 | /* Attach to process PID, then initialize for debugging it. */ | |
180 | ||
181 | static void | |
182 | inf_ptrace_attach (char *args, int from_tty) | |
183 | { | |
184 | char *exec_file; | |
185 | int pid; | |
186 | char *dummy; | |
187 | ||
188 | if (!args) | |
189 | error_no_arg ("process-id to attach"); | |
190 | ||
191 | dummy = args; | |
192 | pid = strtol (args, &dummy, 0); | |
f6ffd89b | 193 | /* Some targets don't set errno on errors, grrr! */ |
6e1e94ea | 194 | if (pid == 0 && args == dummy) |
5bf970f9 AC |
195 | error ("Illegal process-id: %s\n", args); |
196 | ||
f6ffd89b | 197 | if (pid == getpid ()) /* Trying to masturbate? */ |
5bf970f9 AC |
198 | error ("I refuse to debug myself!"); |
199 | ||
200 | if (from_tty) | |
201 | { | |
202 | exec_file = (char *) get_exec_file (0); | |
203 | ||
204 | if (exec_file) | |
205 | printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, | |
206 | target_pid_to_str (pid_to_ptid (pid))); | |
207 | else | |
208 | printf_unfiltered ("Attaching to %s\n", | |
209 | target_pid_to_str (pid_to_ptid (pid))); | |
210 | ||
211 | gdb_flush (gdb_stdout); | |
212 | } | |
213 | ||
6e1e94ea MK |
214 | #ifdef PT_ATTACH |
215 | errno = 0; | |
216 | ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3) 0, 0); | |
217 | if (errno != 0) | |
218 | perror_with_name ("ptrace"); | |
219 | attach_flag = 1; | |
220 | #else | |
221 | error ("This system does not support attaching to a process"); | |
222 | #endif | |
5bf970f9 AC |
223 | |
224 | inferior_ptid = pid_to_ptid (pid); | |
225 | push_target (ptrace_ops_hack); | |
12b8a2cb DJ |
226 | |
227 | /* Do this first, before anything has had a chance to query the | |
228 | inferior's symbol table or similar. */ | |
229 | observer_notify_inferior_created (¤t_target, from_tty); | |
5bf970f9 AC |
230 | } |
231 | ||
232 | static void | |
233 | inf_ptrace_post_attach (int pid) | |
234 | { | |
235 | /* This version of Unix doesn't require a meaningful "post attach" | |
236 | operation by a debugger. */ | |
237 | } | |
238 | ||
239 | /* Take a program previously attached to and detaches it. The program | |
240 | resumes execution and will no longer stop on signals, etc. We'd | |
241 | better not have left any breakpoints in the program or it'll die | |
242 | when it hits one. For this to work, it may be necessary for the | |
243 | process to have been previously attached. It *might* work if the | |
244 | program was started via the normal ptrace (PTRACE_TRACEME). */ | |
245 | ||
246 | static void | |
247 | inf_ptrace_detach (char *args, int from_tty) | |
248 | { | |
6e1e94ea | 249 | int sig = 0; |
5bf970f9 AC |
250 | int pid = PIDGET (inferior_ptid); |
251 | ||
252 | if (from_tty) | |
253 | { | |
254 | char *exec_file = get_exec_file (0); | |
255 | if (exec_file == 0) | |
256 | exec_file = ""; | |
257 | printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, | |
258 | target_pid_to_str (pid_to_ptid (pid))); | |
259 | gdb_flush (gdb_stdout); | |
260 | } | |
261 | if (args) | |
6e1e94ea | 262 | sig = atoi (args); |
5bf970f9 | 263 | |
6e1e94ea MK |
264 | #ifdef PT_DETACH |
265 | errno = 0; | |
266 | ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3) 1, sig); | |
267 | if (errno != 0) | |
268 | perror_with_name ("ptrace"); | |
269 | attach_flag = 0; | |
270 | #else | |
271 | error ("This system does not support detaching from a process"); | |
272 | #endif | |
5bf970f9 AC |
273 | |
274 | inferior_ptid = null_ptid; | |
275 | unpush_target (ptrace_ops_hack); | |
276 | } | |
277 | ||
278 | /* Get ready to modify the registers array. On machines which store | |
279 | individual registers, this doesn't need to do anything. On | |
280 | machines which store all the registers in one fell swoop, this | |
281 | makes sure that registers contains all the registers from the | |
282 | program being debugged. */ | |
283 | ||
284 | static void | |
285 | inf_ptrace_prepare_to_store (void) | |
286 | { | |
287 | } | |
288 | ||
289 | /* Print status information about what we're accessing. */ | |
290 | ||
291 | static void | |
292 | inf_ptrace_files_info (struct target_ops *ignore) | |
293 | { | |
294 | printf_unfiltered ("\tUsing the running image of %s %s.\n", | |
295 | attach_flag ? "attached" : "child", | |
296 | target_pid_to_str (inferior_ptid)); | |
297 | } | |
298 | ||
299 | static void | |
300 | inf_ptrace_open (char *arg, int from_tty) | |
301 | { | |
302 | error ("Use the \"run\" command to start a Unix child process."); | |
303 | } | |
304 | ||
305 | /* Stub function which causes the inferior that runs it, to be ptrace-able | |
306 | by its parent process. */ | |
307 | ||
308 | static void | |
309 | inf_ptrace_me (void) | |
310 | { | |
f6ffd89b | 311 | /* "Trace me, Dr. Memory!" */ |
62ece330 | 312 | ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0); |
5bf970f9 AC |
313 | } |
314 | ||
315 | /* Stub function which causes the GDB that runs it, to start ptrace-ing | |
316 | the child process. */ | |
317 | ||
318 | static void | |
319 | inf_ptrace_him (int pid) | |
320 | { | |
321 | push_target (ptrace_ops_hack); | |
322 | ||
323 | /* On some targets, there must be some explicit synchronization | |
324 | between the parent and child processes after the debugger | |
325 | forks, and before the child execs the debuggee program. This | |
f6ffd89b | 326 | call basically gives permission for the child to exec. */ |
5bf970f9 AC |
327 | |
328 | target_acknowledge_created_inferior (pid); | |
329 | ||
f6ffd89b MK |
330 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
331 | be 1 or 2 depending on whether we're starting without or with a | |
332 | shell. */ | |
5bf970f9 AC |
333 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
334 | ||
335 | /* On some targets, there must be some explicit actions taken after | |
f6ffd89b | 336 | the inferior has been started up. */ |
5bf970f9 AC |
337 | target_post_startup_inferior (pid_to_ptid (pid)); |
338 | } | |
339 | ||
340 | /* Start an inferior Unix child process and sets inferior_ptid to its | |
341 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing | |
342 | the arguments to the program. ENV is the environment vector to | |
343 | pass. Errors reported with error(). */ | |
344 | ||
345 | static void | |
346 | inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env, | |
347 | int from_tty) | |
348 | { | |
349 | fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him, | |
350 | NULL, NULL); | |
351 | /* We are at the first instruction we care about. */ | |
352 | observer_notify_inferior_created (¤t_target, from_tty); | |
f6ffd89b | 353 | /* Pedal to the metal... */ |
5bf970f9 AC |
354 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
355 | } | |
356 | ||
357 | static void | |
358 | inf_ptrace_post_startup_inferior (ptid_t ptid) | |
359 | { | |
f6ffd89b MK |
360 | /* This version of Unix doesn't require a meaningful "post startup |
361 | inferior" operation by a debugger. */ | |
5bf970f9 AC |
362 | } |
363 | ||
364 | static void | |
365 | inf_ptrace_acknowledge_created_inferior (int pid) | |
366 | { | |
f6ffd89b MK |
367 | /* This version of Unix doesn't require a meaningful "acknowledge |
368 | created inferior" operation by a debugger. */ | |
5bf970f9 AC |
369 | } |
370 | ||
371 | static int | |
372 | inf_ptrace_insert_fork_catchpoint (int pid) | |
373 | { | |
374 | /* This version of Unix doesn't support notification of fork events. */ | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static int | |
379 | inf_ptrace_remove_fork_catchpoint (int pid) | |
380 | { | |
381 | /* This version of Unix doesn't support notification of fork events. */ | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int | |
386 | inf_ptrace_insert_vfork_catchpoint (int pid) | |
387 | { | |
388 | /* This version of Unix doesn't support notification of vfork events. */ | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int | |
393 | inf_ptrace_remove_vfork_catchpoint (int pid) | |
394 | { | |
395 | /* This version of Unix doesn't support notification of vfork events. */ | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static int | |
400 | inf_ptrace_follow_fork (int follow_child) | |
401 | { | |
402 | /* This version of Unix doesn't support following fork or vfork events. */ | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int | |
407 | inf_ptrace_insert_exec_catchpoint (int pid) | |
408 | { | |
409 | /* This version of Unix doesn't support notification of exec events. */ | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static int | |
414 | inf_ptrace_remove_exec_catchpoint (int pid) | |
415 | { | |
416 | /* This version of Unix doesn't support notification of exec events. */ | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int | |
421 | inf_ptrace_reported_exec_events_per_exec_call (void) | |
422 | { | |
f6ffd89b | 423 | /* This version of Unix doesn't support notification of exec events. */ |
5bf970f9 AC |
424 | return 1; |
425 | } | |
426 | ||
427 | static int | |
428 | inf_ptrace_has_exited (int pid, int wait_status, int *exit_status) | |
429 | { | |
430 | if (WIFEXITED (wait_status)) | |
431 | { | |
432 | *exit_status = WEXITSTATUS (wait_status); | |
433 | return 1; | |
434 | } | |
435 | ||
436 | if (WIFSIGNALED (wait_status)) | |
437 | { | |
438 | *exit_status = 0; /* ?? Don't know what else to say here. */ | |
439 | return 1; | |
440 | } | |
441 | ||
f6ffd89b MK |
442 | /* ??? Do we really need to consult the event state, too? |
443 | Assume the wait_state alone suffices. */ | |
5bf970f9 AC |
444 | return 0; |
445 | } | |
446 | ||
447 | static void | |
448 | inf_ptrace_mourn_inferior (void) | |
449 | { | |
450 | unpush_target (ptrace_ops_hack); | |
451 | generic_mourn_inferior (); | |
452 | } | |
453 | ||
454 | static int | |
455 | inf_ptrace_can_run (void) | |
456 | { | |
457 | return 1; | |
458 | } | |
459 | ||
460 | /* Send a SIGINT to the process group. This acts just like the user | |
461 | typed a ^C on the controlling terminal. | |
462 | ||
f6ffd89b MK |
463 | FIXME: This may not be correct for all systems. Some may want to |
464 | use killpg() instead of kill (-pgrp). */ | |
5bf970f9 AC |
465 | |
466 | static void | |
467 | inf_ptrace_stop (void) | |
468 | { | |
469 | kill (-inferior_process_group, SIGINT); | |
470 | } | |
471 | ||
472 | /* Perform a partial transfer to/from the specified object. For | |
473 | memory transfers, fall back to the old memory xfer functions. */ | |
474 | ||
475 | static LONGEST | |
476 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
477 | const char *annex, void *readbuf, | |
478 | const void *writebuf, ULONGEST offset, LONGEST len) | |
479 | { | |
480 | switch (object) | |
481 | { | |
482 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
483 | #ifdef PT_IO |
484 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
485 | request that promises to be much more efficient in reading | |
486 | and writing data in the traced process's address space. */ | |
487 | { | |
488 | struct ptrace_io_desc piod; | |
489 | ||
490 | /* NOTE: We assume that there are no distinct address spaces | |
491 | for instruction and data. */ | |
492 | piod.piod_op = writebuf ? PIOD_WRITE_D : PIOD_READ_D; | |
493 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; | |
494 | piod.piod_offs = (void *) (long) offset; | |
495 | piod.piod_len = len; | |
496 | ||
497 | errno = 0; | |
498 | if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == 0) | |
499 | /* Return the actual number of bytes read or written. */ | |
500 | return piod.piod_len; | |
501 | /* If the PT_IO request is somehow not supported, fallback on | |
502 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
503 | to indicate failure. */ | |
504 | if (errno != EINVAL) | |
505 | return 0; | |
506 | } | |
507 | #endif | |
508 | { | |
509 | union | |
510 | { | |
511 | PTRACE_TYPE_RET word; | |
512 | unsigned char byte[sizeof (PTRACE_TYPE_RET)]; | |
513 | } buffer; | |
514 | ULONGEST rounded_offset; | |
515 | LONGEST partial_len; | |
516 | ||
cb85a953 AC |
517 | /* Round the start offset down to the next long word |
518 | boundary. */ | |
f929a579 AC |
519 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
520 | ||
cb85a953 AC |
521 | /* Since ptrace will transfer a single word starting at that |
522 | rounded_offset the partial_len needs to be adjusted down to | |
523 | that (remember this function only does a single transfer). | |
524 | Should the required length be even less, adjust it down | |
525 | again. */ | |
526 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
527 | if (partial_len > len) | |
f929a579 AC |
528 | partial_len = len; |
529 | ||
530 | if (writebuf) | |
531 | { | |
cb85a953 AC |
532 | /* If OFFSET:PARTIAL_LEN is smaller than |
533 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
534 | be needed. Read in the entire word. */ | |
f929a579 | 535 | if (rounded_offset < offset |
cb85a953 AC |
536 | || (offset + partial_len |
537 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 AC |
538 | /* Need part of initial word -- fetch it. */ |
539 | buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid), | |
540 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
541 | 0); | |
542 | ||
543 | /* Copy data to be written over corresponding part of | |
544 | buffer. */ | |
f6ffd89b MK |
545 | memcpy (buffer.byte + (offset - rounded_offset), |
546 | writebuf, partial_len); | |
f929a579 AC |
547 | |
548 | errno = 0; | |
549 | ptrace (PT_WRITE_D, PIDGET (inferior_ptid), | |
550 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
cb85a953 | 551 | buffer.word); |
f929a579 AC |
552 | if (errno) |
553 | { | |
554 | /* Using the appropriate one (I or D) is necessary for | |
555 | Gould NP1, at least. */ | |
556 | errno = 0; | |
557 | ptrace (PT_WRITE_I, PIDGET (inferior_ptid), | |
558 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
cb85a953 | 559 | buffer.word); |
f929a579 AC |
560 | if (errno) |
561 | return 0; | |
562 | } | |
563 | } | |
564 | if (readbuf) | |
565 | { | |
566 | errno = 0; | |
567 | buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid), | |
568 | (PTRACE_TYPE_ARG3) (long) rounded_offset, 0); | |
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 | } | |
575 | return partial_len; | |
576 | } | |
5bf970f9 AC |
577 | |
578 | case TARGET_OBJECT_UNWIND_TABLE: | |
579 | return -1; | |
580 | ||
581 | case TARGET_OBJECT_AUXV: | |
582 | return -1; | |
583 | ||
584 | case TARGET_OBJECT_WCOOKIE: | |
585 | return -1; | |
586 | ||
587 | default: | |
588 | return -1; | |
589 | } | |
590 | } | |
591 | ||
592 | static char * | |
593 | inf_ptrace_pid_to_str (ptid_t ptid) | |
594 | { | |
595 | return normal_pid_to_str (ptid); | |
596 | } | |
597 | ||
8785ced0 MK |
598 | /* Create a prototype ptrace target. The client can override it with |
599 | local methods. */ | |
600 | ||
5bf970f9 AC |
601 | struct target_ops * |
602 | inf_ptrace_target (void) | |
603 | { | |
604 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 605 | |
5bf970f9 AC |
606 | t->to_open = inf_ptrace_open; |
607 | t->to_attach = inf_ptrace_attach; | |
608 | t->to_post_attach = inf_ptrace_post_attach; | |
609 | t->to_detach = inf_ptrace_detach; | |
610 | t->to_resume = inf_ptrace_resume; | |
611 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 | 612 | t->to_prepare_to_store = inf_ptrace_prepare_to_store; |
5bf970f9 AC |
613 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
614 | t->to_files_info = inf_ptrace_files_info; | |
615 | t->to_kill = inf_ptrace_kill_inferior; | |
616 | t->to_create_inferior = inf_ptrace_create_inferior; | |
617 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; | |
618 | t->to_acknowledge_created_inferior = | |
619 | inf_ptrace_acknowledge_created_inferior; | |
620 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; | |
621 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; | |
622 | t->to_insert_vfork_catchpoint = inf_ptrace_insert_vfork_catchpoint; | |
623 | t->to_remove_vfork_catchpoint = inf_ptrace_remove_vfork_catchpoint; | |
624 | t->to_follow_fork = inf_ptrace_follow_fork; | |
625 | t->to_insert_exec_catchpoint = inf_ptrace_insert_exec_catchpoint; | |
626 | t->to_remove_exec_catchpoint = inf_ptrace_remove_exec_catchpoint; | |
627 | t->to_reported_exec_events_per_exec_call = | |
628 | inf_ptrace_reported_exec_events_per_exec_call; | |
629 | t->to_has_exited = inf_ptrace_has_exited; | |
630 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; | |
631 | t->to_can_run = inf_ptrace_can_run; | |
632 | t->to_thread_alive = inf_ptrace_thread_alive; | |
633 | t->to_pid_to_str = inf_ptrace_pid_to_str; | |
634 | t->to_stop = inf_ptrace_stop; | |
635 | t->to_stratum = process_stratum; | |
636 | t->to_has_all_memory = 1; | |
637 | t->to_has_memory = 1; | |
638 | t->to_has_stack = 1; | |
639 | t->to_has_registers = 1; | |
640 | t->to_has_execution = 1; | |
641 | t->to_magic = OPS_MAGIC; | |
642 | ptrace_ops_hack = t; | |
8785ced0 MK |
643 | |
644 | return t; | |
645 | } | |
646 | \f | |
647 | ||
648 | /* Pointer to a function that returns the oggset within the user area | |
649 | where a particular register is stored. */ | |
650 | static CORE_ADDR (*inf_ptrace_register_u_offset)(int); | |
651 | ||
652 | /* Fetch register REGNUM from the inferior. */ | |
653 | ||
654 | static void | |
655 | inf_ptrace_fetch_register (int regnum) | |
656 | { | |
657 | CORE_ADDR addr; | |
658 | size_t size; | |
659 | PTRACE_TYPE_RET *buf; | |
660 | int pid, i; | |
661 | ||
662 | /* Cater for systems like GNU/Linux, that implement threads as | |
663 | seperate processes. */ | |
664 | pid = ptid_get_lwp (inferior_ptid); | |
665 | if (pid == 0) | |
666 | pid = ptid_get_pid (inferior_ptid); | |
667 | ||
668 | /* This isn't really an address, but ptrace thinks of it as one. */ | |
669 | addr = inf_ptrace_register_u_offset (regnum); | |
670 | size = register_size (current_gdbarch, regnum); | |
671 | ||
672 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); | |
673 | buf = alloca (size); | |
674 | ||
675 | /* Read the register contents from the inferior a chuck at the time. */ | |
676 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
677 | { | |
678 | errno = 0; | |
679 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) addr, 0); | |
680 | if (errno != 0) | |
681 | error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regnum), | |
682 | regnum, safe_strerror (errno)); | |
683 | ||
684 | addr += sizeof (PTRACE_TYPE_RET); | |
685 | } | |
686 | regcache_raw_supply (current_regcache, regnum, buf); | |
687 | } | |
688 | ||
689 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
690 | for all registers. */ | |
691 | ||
692 | static void | |
693 | inf_ptrace_fetch_registers (int regnum) | |
694 | { | |
695 | if (regnum == -1) | |
696 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
697 | inf_ptrace_fetch_register (regnum); | |
698 | else | |
699 | inf_ptrace_fetch_register (regnum); | |
700 | } | |
701 | ||
702 | /* Store register REGNUM into the inferior. */ | |
703 | ||
704 | static void | |
705 | inf_ptrace_store_register (int regnum) | |
706 | { | |
707 | CORE_ADDR addr; | |
708 | size_t size; | |
709 | PTRACE_TYPE_RET *buf; | |
710 | int pid, i; | |
711 | ||
712 | /* Cater for systems like GNU/Linux, that implement threads as | |
713 | seperate processes. */ | |
714 | pid = ptid_get_lwp (inferior_ptid); | |
715 | if (pid == 0) | |
716 | pid = ptid_get_pid (inferior_ptid); | |
717 | ||
718 | /* This isn't really an address, but ptrace thinks of it as one. */ | |
719 | addr = inf_ptrace_register_u_offset (regnum); | |
720 | size = register_size (current_gdbarch, regnum); | |
721 | ||
722 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); | |
723 | buf = alloca (size); | |
724 | ||
725 | /* Write the register contents into the inferior a chunk at the time. */ | |
726 | regcache_raw_collect (current_regcache, regnum, buf); | |
727 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
728 | { | |
729 | errno = 0; | |
730 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) addr, buf[i]); | |
731 | if (errno != 0) | |
732 | error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regnum), | |
733 | regnum, safe_strerror (errno)); | |
734 | ||
735 | addr += sizeof (PTRACE_TYPE_RET); | |
736 | } | |
737 | } | |
738 | ||
739 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
740 | this for all registers. */ | |
741 | ||
742 | void | |
743 | inf_ptrace_store_registers (int regnum) | |
744 | { | |
745 | if (regnum == -1) | |
746 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
747 | inf_ptrace_store_register (regnum); | |
748 | else | |
749 | inf_ptrace_store_register (regnum); | |
750 | } | |
751 | ||
752 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
753 | a function returning the offset within the user area where a | |
754 | particular register is stored. */ | |
755 | ||
756 | struct target_ops * | |
757 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(int)) | |
758 | { | |
759 | struct target_ops *t = inf_ptrace_target(); | |
760 | ||
761 | gdb_assert (register_u_offset); | |
762 | inf_ptrace_register_u_offset = register_u_offset; | |
763 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
764 | t->to_store_registers = inf_ptrace_store_registers; | |
765 | ||
5bf970f9 AC |
766 | return t; |
767 | } |