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) | |
e2e0b3e5 | 98 | perror_with_name (("ptrace")); |
5bf970f9 AC |
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) | |
e2e0b3e5 | 189 | error_no_arg (_("process-id to attach")); |
5bf970f9 AC |
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) |
8a3fe4f8 | 195 | error (_("Illegal process-id: %s."), args); |
5bf970f9 | 196 | |
f6ffd89b | 197 | if (pid == getpid ()) /* Trying to masturbate? */ |
8a3fe4f8 | 198 | error (_("I refuse to debug myself!")); |
5bf970f9 AC |
199 | |
200 | if (from_tty) | |
201 | { | |
202 | exec_file = (char *) get_exec_file (0); | |
203 | ||
204 | if (exec_file) | |
a3f17187 | 205 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
5bf970f9 AC |
206 | target_pid_to_str (pid_to_ptid (pid))); |
207 | else | |
a3f17187 | 208 | printf_unfiltered (_("Attaching to %s\n"), |
5bf970f9 AC |
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) | |
e2e0b3e5 | 218 | perror_with_name (("ptrace")); |
6e1e94ea MK |
219 | attach_flag = 1; |
220 | #else | |
8a3fe4f8 | 221 | error (_("This system does not support attaching to a process")); |
6e1e94ea | 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 = ""; | |
a3f17187 | 257 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
5bf970f9 AC |
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) | |
e2e0b3e5 | 268 | perror_with_name (("ptrace")); |
6e1e94ea MK |
269 | attach_flag = 0; |
270 | #else | |
8a3fe4f8 | 271 | error (_("This system does not support detaching from a process")); |
6e1e94ea | 272 | #endif |
5bf970f9 AC |
273 | |
274 | inferior_ptid = null_ptid; | |
275 | unpush_target (ptrace_ops_hack); | |
276 | } | |
277 | ||
5bf970f9 AC |
278 | /* Print status information about what we're accessing. */ |
279 | ||
280 | static void | |
281 | inf_ptrace_files_info (struct target_ops *ignore) | |
282 | { | |
a3f17187 | 283 | printf_unfiltered (_("\tUsing the running image of %s %s.\n"), |
5bf970f9 AC |
284 | attach_flag ? "attached" : "child", |
285 | target_pid_to_str (inferior_ptid)); | |
286 | } | |
287 | ||
288 | static void | |
289 | inf_ptrace_open (char *arg, int from_tty) | |
290 | { | |
8a3fe4f8 | 291 | error (_("Use the \"run\" command to start a Unix child process.")); |
5bf970f9 AC |
292 | } |
293 | ||
294 | /* Stub function which causes the inferior that runs it, to be ptrace-able | |
295 | by its parent process. */ | |
296 | ||
297 | static void | |
298 | inf_ptrace_me (void) | |
299 | { | |
f6ffd89b | 300 | /* "Trace me, Dr. Memory!" */ |
62ece330 | 301 | ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0); |
5bf970f9 AC |
302 | } |
303 | ||
304 | /* Stub function which causes the GDB that runs it, to start ptrace-ing | |
305 | the child process. */ | |
306 | ||
307 | static void | |
308 | inf_ptrace_him (int pid) | |
309 | { | |
310 | push_target (ptrace_ops_hack); | |
311 | ||
312 | /* On some targets, there must be some explicit synchronization | |
313 | between the parent and child processes after the debugger | |
314 | forks, and before the child execs the debuggee program. This | |
f6ffd89b | 315 | call basically gives permission for the child to exec. */ |
5bf970f9 AC |
316 | |
317 | target_acknowledge_created_inferior (pid); | |
318 | ||
f6ffd89b MK |
319 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will |
320 | be 1 or 2 depending on whether we're starting without or with a | |
321 | shell. */ | |
5bf970f9 AC |
322 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
323 | ||
324 | /* On some targets, there must be some explicit actions taken after | |
f6ffd89b | 325 | the inferior has been started up. */ |
5bf970f9 AC |
326 | target_post_startup_inferior (pid_to_ptid (pid)); |
327 | } | |
328 | ||
329 | /* Start an inferior Unix child process and sets inferior_ptid to its | |
330 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing | |
331 | the arguments to the program. ENV is the environment vector to | |
332 | pass. Errors reported with error(). */ | |
333 | ||
334 | static void | |
335 | inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env, | |
336 | int from_tty) | |
337 | { | |
338 | fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him, | |
339 | NULL, NULL); | |
340 | /* We are at the first instruction we care about. */ | |
341 | observer_notify_inferior_created (¤t_target, from_tty); | |
f6ffd89b | 342 | /* Pedal to the metal... */ |
5bf970f9 AC |
343 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
344 | } | |
345 | ||
5bf970f9 AC |
346 | static int |
347 | inf_ptrace_reported_exec_events_per_exec_call (void) | |
348 | { | |
53283f86 | 349 | /* Typically, we get a single SIGTRAP per exec. */ |
5bf970f9 AC |
350 | return 1; |
351 | } | |
352 | ||
353 | static int | |
354 | inf_ptrace_has_exited (int pid, int wait_status, int *exit_status) | |
355 | { | |
356 | if (WIFEXITED (wait_status)) | |
357 | { | |
358 | *exit_status = WEXITSTATUS (wait_status); | |
359 | return 1; | |
360 | } | |
361 | ||
362 | if (WIFSIGNALED (wait_status)) | |
363 | { | |
364 | *exit_status = 0; /* ?? Don't know what else to say here. */ | |
365 | return 1; | |
366 | } | |
367 | ||
f6ffd89b MK |
368 | /* ??? Do we really need to consult the event state, too? |
369 | Assume the wait_state alone suffices. */ | |
5bf970f9 AC |
370 | return 0; |
371 | } | |
372 | ||
373 | static void | |
374 | inf_ptrace_mourn_inferior (void) | |
375 | { | |
376 | unpush_target (ptrace_ops_hack); | |
377 | generic_mourn_inferior (); | |
378 | } | |
379 | ||
380 | static int | |
381 | inf_ptrace_can_run (void) | |
382 | { | |
383 | return 1; | |
384 | } | |
385 | ||
386 | /* Send a SIGINT to the process group. This acts just like the user | |
387 | typed a ^C on the controlling terminal. | |
388 | ||
f6ffd89b MK |
389 | FIXME: This may not be correct for all systems. Some may want to |
390 | use killpg() instead of kill (-pgrp). */ | |
5bf970f9 AC |
391 | |
392 | static void | |
393 | inf_ptrace_stop (void) | |
394 | { | |
395 | kill (-inferior_process_group, SIGINT); | |
396 | } | |
397 | ||
398 | /* Perform a partial transfer to/from the specified object. For | |
399 | memory transfers, fall back to the old memory xfer functions. */ | |
400 | ||
401 | static LONGEST | |
402 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, | |
403 | const char *annex, void *readbuf, | |
404 | const void *writebuf, ULONGEST offset, LONGEST len) | |
405 | { | |
406 | switch (object) | |
407 | { | |
408 | case TARGET_OBJECT_MEMORY: | |
f929a579 AC |
409 | #ifdef PT_IO |
410 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO | |
411 | request that promises to be much more efficient in reading | |
412 | and writing data in the traced process's address space. */ | |
413 | { | |
414 | struct ptrace_io_desc piod; | |
415 | ||
416 | /* NOTE: We assume that there are no distinct address spaces | |
417 | for instruction and data. */ | |
418 | piod.piod_op = writebuf ? PIOD_WRITE_D : PIOD_READ_D; | |
419 | piod.piod_addr = writebuf ? (void *) writebuf : readbuf; | |
420 | piod.piod_offs = (void *) (long) offset; | |
421 | piod.piod_len = len; | |
422 | ||
423 | errno = 0; | |
424 | if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == 0) | |
425 | /* Return the actual number of bytes read or written. */ | |
426 | return piod.piod_len; | |
427 | /* If the PT_IO request is somehow not supported, fallback on | |
428 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero | |
429 | to indicate failure. */ | |
430 | if (errno != EINVAL) | |
431 | return 0; | |
432 | } | |
433 | #endif | |
434 | { | |
435 | union | |
436 | { | |
437 | PTRACE_TYPE_RET word; | |
438 | unsigned char byte[sizeof (PTRACE_TYPE_RET)]; | |
439 | } buffer; | |
440 | ULONGEST rounded_offset; | |
441 | LONGEST partial_len; | |
442 | ||
cb85a953 AC |
443 | /* Round the start offset down to the next long word |
444 | boundary. */ | |
f929a579 AC |
445 | rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET); |
446 | ||
cb85a953 AC |
447 | /* Since ptrace will transfer a single word starting at that |
448 | rounded_offset the partial_len needs to be adjusted down to | |
449 | that (remember this function only does a single transfer). | |
450 | Should the required length be even less, adjust it down | |
451 | again. */ | |
452 | partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset; | |
453 | if (partial_len > len) | |
f929a579 AC |
454 | partial_len = len; |
455 | ||
456 | if (writebuf) | |
457 | { | |
cb85a953 AC |
458 | /* If OFFSET:PARTIAL_LEN is smaller than |
459 | ROUNDED_OFFSET:WORDSIZE then a read/modify write will | |
460 | be needed. Read in the entire word. */ | |
f929a579 | 461 | if (rounded_offset < offset |
cb85a953 AC |
462 | || (offset + partial_len |
463 | < rounded_offset + sizeof (PTRACE_TYPE_RET))) | |
f929a579 AC |
464 | /* Need part of initial word -- fetch it. */ |
465 | buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid), | |
466 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
467 | 0); | |
468 | ||
469 | /* Copy data to be written over corresponding part of | |
470 | buffer. */ | |
f6ffd89b MK |
471 | memcpy (buffer.byte + (offset - rounded_offset), |
472 | writebuf, partial_len); | |
f929a579 AC |
473 | |
474 | errno = 0; | |
475 | ptrace (PT_WRITE_D, PIDGET (inferior_ptid), | |
476 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
cb85a953 | 477 | buffer.word); |
f929a579 AC |
478 | if (errno) |
479 | { | |
480 | /* Using the appropriate one (I or D) is necessary for | |
481 | Gould NP1, at least. */ | |
482 | errno = 0; | |
483 | ptrace (PT_WRITE_I, PIDGET (inferior_ptid), | |
484 | (PTRACE_TYPE_ARG3) (long) rounded_offset, | |
cb85a953 | 485 | buffer.word); |
f929a579 AC |
486 | if (errno) |
487 | return 0; | |
488 | } | |
489 | } | |
490 | if (readbuf) | |
491 | { | |
492 | errno = 0; | |
493 | buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid), | |
494 | (PTRACE_TYPE_ARG3) (long) rounded_offset, 0); | |
495 | if (errno) | |
496 | return 0; | |
497 | /* Copy appropriate bytes out of the buffer. */ | |
498 | memcpy (readbuf, buffer.byte + (offset - rounded_offset), | |
499 | partial_len); | |
500 | } | |
501 | return partial_len; | |
502 | } | |
5bf970f9 AC |
503 | |
504 | case TARGET_OBJECT_UNWIND_TABLE: | |
505 | return -1; | |
506 | ||
507 | case TARGET_OBJECT_AUXV: | |
508 | return -1; | |
509 | ||
510 | case TARGET_OBJECT_WCOOKIE: | |
511 | return -1; | |
512 | ||
513 | default: | |
514 | return -1; | |
515 | } | |
516 | } | |
517 | ||
518 | static char * | |
519 | inf_ptrace_pid_to_str (ptid_t ptid) | |
520 | { | |
521 | return normal_pid_to_str (ptid); | |
522 | } | |
523 | ||
8785ced0 MK |
524 | /* Create a prototype ptrace target. The client can override it with |
525 | local methods. */ | |
526 | ||
5bf970f9 AC |
527 | struct target_ops * |
528 | inf_ptrace_target (void) | |
529 | { | |
530 | struct target_ops *t = inf_child_target (); | |
8785ced0 | 531 | |
5bf970f9 AC |
532 | t->to_open = inf_ptrace_open; |
533 | t->to_attach = inf_ptrace_attach; | |
534 | t->to_post_attach = inf_ptrace_post_attach; | |
535 | t->to_detach = inf_ptrace_detach; | |
536 | t->to_resume = inf_ptrace_resume; | |
537 | t->to_wait = inf_ptrace_wait; | |
5bf970f9 AC |
538 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
539 | t->to_files_info = inf_ptrace_files_info; | |
540 | t->to_kill = inf_ptrace_kill_inferior; | |
541 | t->to_create_inferior = inf_ptrace_create_inferior; | |
5bf970f9 AC |
542 | t->to_reported_exec_events_per_exec_call = |
543 | inf_ptrace_reported_exec_events_per_exec_call; | |
544 | t->to_has_exited = inf_ptrace_has_exited; | |
545 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; | |
546 | t->to_can_run = inf_ptrace_can_run; | |
547 | t->to_thread_alive = inf_ptrace_thread_alive; | |
548 | t->to_pid_to_str = inf_ptrace_pid_to_str; | |
549 | t->to_stop = inf_ptrace_stop; | |
550 | t->to_stratum = process_stratum; | |
551 | t->to_has_all_memory = 1; | |
552 | t->to_has_memory = 1; | |
553 | t->to_has_stack = 1; | |
554 | t->to_has_registers = 1; | |
555 | t->to_has_execution = 1; | |
556 | t->to_magic = OPS_MAGIC; | |
557 | ptrace_ops_hack = t; | |
8785ced0 MK |
558 | |
559 | return t; | |
560 | } | |
561 | \f | |
562 | ||
563 | /* Pointer to a function that returns the oggset within the user area | |
564 | where a particular register is stored. */ | |
565 | static CORE_ADDR (*inf_ptrace_register_u_offset)(int); | |
566 | ||
567 | /* Fetch register REGNUM from the inferior. */ | |
568 | ||
569 | static void | |
570 | inf_ptrace_fetch_register (int regnum) | |
571 | { | |
572 | CORE_ADDR addr; | |
573 | size_t size; | |
574 | PTRACE_TYPE_RET *buf; | |
575 | int pid, i; | |
576 | ||
577 | /* Cater for systems like GNU/Linux, that implement threads as | |
578 | seperate processes. */ | |
579 | pid = ptid_get_lwp (inferior_ptid); | |
580 | if (pid == 0) | |
581 | pid = ptid_get_pid (inferior_ptid); | |
582 | ||
583 | /* This isn't really an address, but ptrace thinks of it as one. */ | |
584 | addr = inf_ptrace_register_u_offset (regnum); | |
585 | size = register_size (current_gdbarch, regnum); | |
586 | ||
587 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); | |
588 | buf = alloca (size); | |
589 | ||
590 | /* Read the register contents from the inferior a chuck at the time. */ | |
591 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
592 | { | |
593 | errno = 0; | |
594 | buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) addr, 0); | |
595 | if (errno != 0) | |
8a3fe4f8 | 596 | error (_("Couldn't read register %s (#%d): %s."), REGISTER_NAME (regnum), |
8785ced0 MK |
597 | regnum, safe_strerror (errno)); |
598 | ||
599 | addr += sizeof (PTRACE_TYPE_RET); | |
600 | } | |
601 | regcache_raw_supply (current_regcache, regnum, buf); | |
602 | } | |
603 | ||
604 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
605 | for all registers. */ | |
606 | ||
607 | static void | |
608 | inf_ptrace_fetch_registers (int regnum) | |
609 | { | |
610 | if (regnum == -1) | |
611 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
612 | inf_ptrace_fetch_register (regnum); | |
613 | else | |
614 | inf_ptrace_fetch_register (regnum); | |
615 | } | |
616 | ||
617 | /* Store register REGNUM into the inferior. */ | |
618 | ||
619 | static void | |
620 | inf_ptrace_store_register (int regnum) | |
621 | { | |
622 | CORE_ADDR addr; | |
623 | size_t size; | |
624 | PTRACE_TYPE_RET *buf; | |
625 | int pid, i; | |
626 | ||
627 | /* Cater for systems like GNU/Linux, that implement threads as | |
628 | seperate processes. */ | |
629 | pid = ptid_get_lwp (inferior_ptid); | |
630 | if (pid == 0) | |
631 | pid = ptid_get_pid (inferior_ptid); | |
632 | ||
633 | /* This isn't really an address, but ptrace thinks of it as one. */ | |
634 | addr = inf_ptrace_register_u_offset (regnum); | |
635 | size = register_size (current_gdbarch, regnum); | |
636 | ||
637 | gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0); | |
638 | buf = alloca (size); | |
639 | ||
640 | /* Write the register contents into the inferior a chunk at the time. */ | |
641 | regcache_raw_collect (current_regcache, regnum, buf); | |
642 | for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++) | |
643 | { | |
644 | errno = 0; | |
645 | ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) addr, buf[i]); | |
646 | if (errno != 0) | |
8a3fe4f8 | 647 | error (_("Couldn't write register %s (#%d): %s."), REGISTER_NAME (regnum), |
8785ced0 MK |
648 | regnum, safe_strerror (errno)); |
649 | ||
650 | addr += sizeof (PTRACE_TYPE_RET); | |
651 | } | |
652 | } | |
653 | ||
654 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
655 | this for all registers. */ | |
656 | ||
657 | void | |
658 | inf_ptrace_store_registers (int regnum) | |
659 | { | |
660 | if (regnum == -1) | |
661 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
662 | inf_ptrace_store_register (regnum); | |
663 | else | |
664 | inf_ptrace_store_register (regnum); | |
665 | } | |
666 | ||
667 | /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be | |
668 | a function returning the offset within the user area where a | |
669 | particular register is stored. */ | |
670 | ||
671 | struct target_ops * | |
672 | inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(int)) | |
673 | { | |
674 | struct target_ops *t = inf_ptrace_target(); | |
675 | ||
676 | gdb_assert (register_u_offset); | |
677 | inf_ptrace_register_u_offset = register_u_offset; | |
678 | t->to_fetch_registers = inf_ptrace_fetch_registers; | |
679 | t->to_store_registers = inf_ptrace_store_registers; | |
680 | ||
5bf970f9 AC |
681 | return t; |
682 | } |