1 /* Low-level child interface to ptrace.
3 Copyright (C) 1988-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
28 #include "gdb_assert.h"
30 #include "gdb_ptrace.h"
34 #include "inf-ptrace.h"
35 #include "inf-child.h"
36 #include "gdbthread.h"
40 #ifdef PT_GET_PROCESS_STATE
43 inf_ptrace_follow_fork (struct target_ops
*ops
, int follow_child
,
49 pid
= ptid_get_pid (inferior_ptid
);
51 if (ptrace (PT_GET_PROCESS_STATE
, pid
,
52 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
53 perror_with_name (("ptrace"));
55 gdb_assert (pe
.pe_report_event
== PTRACE_FORK
);
56 fpid
= pe
.pe_other_pid
;
60 struct inferior
*parent_inf
, *child_inf
;
61 struct thread_info
*tp
;
63 parent_inf
= find_inferior_pid (pid
);
66 child_inf
= add_inferior (fpid
);
67 child_inf
->attach_flag
= parent_inf
->attach_flag
;
68 copy_terminal_info (child_inf
, parent_inf
);
69 child_inf
->pspace
= parent_inf
->pspace
;
70 child_inf
->aspace
= parent_inf
->aspace
;
72 /* Before detaching from the parent, remove all breakpoints from
74 remove_breakpoints ();
76 if (ptrace (PT_DETACH
, pid
, (PTRACE_TYPE_ARG3
)1, 0) == -1)
77 perror_with_name (("ptrace"));
79 /* Switch inferior_ptid out of the parent's way. */
80 inferior_ptid
= pid_to_ptid (fpid
);
82 /* Delete the parent. */
83 detach_inferior (pid
);
85 add_thread_silent (inferior_ptid
);
89 /* Breakpoints have already been detached from the child by
92 if (ptrace (PT_DETACH
, fpid
, (PTRACE_TYPE_ARG3
)1, 0) == -1)
93 perror_with_name (("ptrace"));
99 #endif /* PT_GET_PROCESS_STATE */
102 /* Prepare to be traced. */
107 /* "Trace me, Dr. Memory!" */
108 ptrace (PT_TRACE_ME
, 0, (PTRACE_TYPE_ARG3
)0, 0);
111 /* Start a new inferior Unix child process. EXEC_FILE is the file to
112 run, ALLARGS is a string containing the arguments to the program.
113 ENV is the environment vector to pass. If FROM_TTY is non-zero, be
117 inf_ptrace_create_inferior (struct target_ops
*ops
,
118 char *exec_file
, char *allargs
, char **env
,
123 /* Do not change either targets above or the same target if already present.
124 The reason is the target stack is shared across multiple inferiors. */
125 int ops_already_pushed
= target_is_pushed (ops
);
126 struct cleanup
*back_to
= make_cleanup (null_cleanup
, NULL
);
128 if (! ops_already_pushed
)
130 /* Clear possible core file with its process_stratum. */
132 make_cleanup_unpush_target (ops
);
135 pid
= fork_inferior (exec_file
, allargs
, env
, inf_ptrace_me
, NULL
,
138 discard_cleanups (back_to
);
140 startup_inferior (START_INFERIOR_TRAPS_EXPECTED
);
142 /* On some targets, there must be some explicit actions taken after
143 the inferior has been started up. */
144 target_post_startup_inferior (pid_to_ptid (pid
));
147 #ifdef PT_GET_PROCESS_STATE
150 inf_ptrace_post_startup_inferior (struct target_ops
*self
, ptid_t pid
)
154 /* Set the initial event mask. */
155 memset (&pe
, 0, sizeof pe
);
156 pe
.pe_set_event
|= PTRACE_FORK
;
157 if (ptrace (PT_SET_EVENT_MASK
, ptid_get_pid (pid
),
158 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
159 perror_with_name (("ptrace"));
164 /* Clean up a rotting corpse of an inferior after it died. */
167 inf_ptrace_mourn_inferior (struct target_ops
*ops
)
171 /* Wait just one more time to collect the inferior's exit status.
172 Do not check whether this succeeds though, since we may be
173 dealing with a process that we attached to. Such a process will
174 only report its exit status to its original parent. */
175 waitpid (ptid_get_pid (inferior_ptid
), &status
, 0);
177 generic_mourn_inferior ();
179 inf_child_maybe_unpush_target (ops
);
182 /* Attach to the process specified by ARGS. If FROM_TTY is non-zero,
183 be chatty about it. */
186 inf_ptrace_attach (struct target_ops
*ops
, char *args
, int from_tty
)
190 struct inferior
*inf
;
192 /* Do not change either targets above or the same target if already present.
193 The reason is the target stack is shared across multiple inferiors. */
194 int ops_already_pushed
= target_is_pushed (ops
);
195 struct cleanup
*back_to
= make_cleanup (null_cleanup
, NULL
);
197 pid
= parse_pid_to_attach (args
);
199 if (pid
== getpid ()) /* Trying to masturbate? */
200 error (_("I refuse to debug myself!"));
202 if (! ops_already_pushed
)
204 /* target_pid_to_str already uses the target. Also clear possible core
205 file with its process_stratum. */
207 make_cleanup_unpush_target (ops
);
212 exec_file
= get_exec_file (0);
215 printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file
,
216 target_pid_to_str (pid_to_ptid (pid
)));
218 printf_unfiltered (_("Attaching to %s\n"),
219 target_pid_to_str (pid_to_ptid (pid
)));
221 gdb_flush (gdb_stdout
);
226 ptrace (PT_ATTACH
, pid
, (PTRACE_TYPE_ARG3
)0, 0);
228 perror_with_name (("ptrace"));
230 error (_("This system does not support attaching to a process"));
233 inf
= current_inferior ();
234 inferior_appeared (inf
, pid
);
235 inf
->attach_flag
= 1;
236 inferior_ptid
= pid_to_ptid (pid
);
238 /* Always add a main thread. If some target extends the ptrace
239 target, it should decorate the ptid later with more info. */
240 add_thread_silent (inferior_ptid
);
242 discard_cleanups (back_to
);
245 #ifdef PT_GET_PROCESS_STATE
248 inf_ptrace_post_attach (struct target_ops
*self
, int pid
)
252 /* Set the initial event mask. */
253 memset (&pe
, 0, sizeof pe
);
254 pe
.pe_set_event
|= PTRACE_FORK
;
255 if (ptrace (PT_SET_EVENT_MASK
, pid
,
256 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
257 perror_with_name (("ptrace"));
262 /* Detach from the inferior, optionally passing it the signal
263 specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */
266 inf_ptrace_detach (struct target_ops
*ops
, const char *args
, int from_tty
)
268 pid_t pid
= ptid_get_pid (inferior_ptid
);
273 char *exec_file
= get_exec_file (0);
276 printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file
,
277 target_pid_to_str (pid_to_ptid (pid
)));
278 gdb_flush (gdb_stdout
);
284 /* We'd better not have left any breakpoints in the program or it'll
285 die when it hits one. Also note that this may only work if we
286 previously attached to the inferior. It *might* work if we
287 started the process ourselves. */
289 ptrace (PT_DETACH
, pid
, (PTRACE_TYPE_ARG3
)1, sig
);
291 perror_with_name (("ptrace"));
293 error (_("This system does not support detaching from a process"));
296 inferior_ptid
= null_ptid
;
297 detach_inferior (pid
);
299 inf_child_maybe_unpush_target (ops
);
302 /* Kill the inferior. */
305 inf_ptrace_kill (struct target_ops
*ops
)
307 pid_t pid
= ptid_get_pid (inferior_ptid
);
313 ptrace (PT_KILL
, pid
, (PTRACE_TYPE_ARG3
)0, 0);
314 waitpid (pid
, &status
, 0);
316 target_mourn_inferior ();
319 /* Stop the inferior. */
322 inf_ptrace_stop (struct target_ops
*self
, ptid_t ptid
)
324 /* Send a SIGINT to the process group. This acts just like the user
325 typed a ^C on the controlling terminal. Note that using a
326 negative process number in kill() is a System V-ism. The proper
327 BSD interface is killpg(). However, all modern BSDs support the
328 System V interface too. */
329 kill (-inferior_process_group (), SIGINT
);
332 /* Resume execution of thread PTID, or all threads if PTID is -1. If
333 STEP is nonzero, single-step it. If SIGNAL is nonzero, give it
337 inf_ptrace_resume (struct target_ops
*ops
,
338 ptid_t ptid
, int step
, enum gdb_signal signal
)
340 pid_t pid
= ptid_get_pid (ptid
);
344 /* Resume all threads. Traditionally ptrace() only supports
345 single-threaded processes, so simply resume the inferior. */
346 pid
= ptid_get_pid (inferior_ptid
);
348 if (catch_syscall_enabled () > 0)
349 request
= PT_SYSCALL
;
351 request
= PT_CONTINUE
;
355 /* If this system does not support PT_STEP, a higher level
356 function will have called single_step() to transmute the step
357 request into a continue request (by setting breakpoints on
358 all possible successor instructions), so we don't have to
359 worry about that here. */
363 /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from
364 where it was. If GDB wanted it to start some other way, we have
365 already written a new program counter value to the child. */
367 ptrace (request
, pid
, (PTRACE_TYPE_ARG3
)1, gdb_signal_to_host (signal
));
369 perror_with_name (("ptrace"));
372 /* Wait for the child specified by PTID to do something. Return the
373 process ID of the child, or MINUS_ONE_PTID in case of error; store
374 the status in *OURSTATUS. */
377 inf_ptrace_wait (struct target_ops
*ops
,
378 ptid_t ptid
, struct target_waitstatus
*ourstatus
, int options
)
381 int status
, save_errno
;
389 pid
= waitpid (ptid_get_pid (ptid
), &status
, 0);
392 while (pid
== -1 && errno
== EINTR
);
394 clear_sigint_trap ();
398 fprintf_unfiltered (gdb_stderr
,
399 _("Child process unexpectedly missing: %s.\n"),
400 safe_strerror (save_errno
));
402 /* Claim it exited with unknown signal. */
403 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
404 ourstatus
->value
.sig
= GDB_SIGNAL_UNKNOWN
;
405 return inferior_ptid
;
408 /* Ignore terminated detached child processes. */
409 if (!WIFSTOPPED (status
) && pid
!= ptid_get_pid (inferior_ptid
))
414 #ifdef PT_GET_PROCESS_STATE
415 if (WIFSTOPPED (status
))
420 if (ptrace (PT_GET_PROCESS_STATE
, pid
,
421 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
422 perror_with_name (("ptrace"));
424 switch (pe
.pe_report_event
)
427 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
428 ourstatus
->value
.related_pid
= pid_to_ptid (pe
.pe_other_pid
);
430 /* Make sure the other end of the fork is stopped too. */
431 fpid
= waitpid (pe
.pe_other_pid
, &status
, 0);
433 perror_with_name (("waitpid"));
435 if (ptrace (PT_GET_PROCESS_STATE
, fpid
,
436 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
437 perror_with_name (("ptrace"));
439 gdb_assert (pe
.pe_report_event
== PTRACE_FORK
);
440 gdb_assert (pe
.pe_other_pid
== pid
);
441 if (fpid
== ptid_get_pid (inferior_ptid
))
443 ourstatus
->value
.related_pid
= pid_to_ptid (pe
.pe_other_pid
);
444 return pid_to_ptid (fpid
);
447 return pid_to_ptid (pid
);
452 store_waitstatus (ourstatus
, status
);
453 return pid_to_ptid (pid
);
456 /* Implement the to_xfer_partial target_ops method. */
458 static enum target_xfer_status
459 inf_ptrace_xfer_partial (struct target_ops
*ops
, enum target_object object
,
460 const char *annex
, gdb_byte
*readbuf
,
461 const gdb_byte
*writebuf
,
462 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
464 pid_t pid
= ptid_get_pid (inferior_ptid
);
468 case TARGET_OBJECT_MEMORY
:
470 /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO
471 request that promises to be much more efficient in reading
472 and writing data in the traced process's address space. */
474 struct ptrace_io_desc piod
;
476 /* NOTE: We assume that there are no distinct address spaces
477 for instruction and data. However, on OpenBSD 3.9 and
478 later, PIOD_WRITE_D doesn't allow changing memory that's
479 mapped read-only. Since most code segments will be
480 read-only, using PIOD_WRITE_D will prevent us from
481 inserting breakpoints, so we use PIOD_WRITE_I instead. */
482 piod
.piod_op
= writebuf
? PIOD_WRITE_I
: PIOD_READ_D
;
483 piod
.piod_addr
= writebuf
? (void *) writebuf
: readbuf
;
484 piod
.piod_offs
= (void *) (long) offset
;
488 if (ptrace (PT_IO
, pid
, (caddr_t
)&piod
, 0) == 0)
490 /* Return the actual number of bytes read or written. */
491 *xfered_len
= piod
.piod_len
;
492 return (piod
.piod_len
== 0) ? TARGET_XFER_EOF
: TARGET_XFER_OK
;
494 /* If the PT_IO request is somehow not supported, fallback on
495 using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
496 to indicate failure. */
498 return TARGET_XFER_EOF
;
504 PTRACE_TYPE_RET word
;
505 gdb_byte byte
[sizeof (PTRACE_TYPE_RET
)];
507 ULONGEST rounded_offset
;
508 ULONGEST partial_len
;
510 /* Round the start offset down to the next long word
512 rounded_offset
= offset
& -(ULONGEST
) sizeof (PTRACE_TYPE_RET
);
514 /* Since ptrace will transfer a single word starting at that
515 rounded_offset the partial_len needs to be adjusted down to
516 that (remember this function only does a single transfer).
517 Should the required length be even less, adjust it down
519 partial_len
= (rounded_offset
+ sizeof (PTRACE_TYPE_RET
)) - offset
;
520 if (partial_len
> len
)
525 /* If OFFSET:PARTIAL_LEN is smaller than
526 ROUNDED_OFFSET:WORDSIZE then a read/modify write will
527 be needed. Read in the entire word. */
528 if (rounded_offset
< offset
529 || (offset
+ partial_len
530 < rounded_offset
+ sizeof (PTRACE_TYPE_RET
)))
531 /* Need part of initial word -- fetch it. */
532 buffer
.word
= ptrace (PT_READ_I
, pid
,
533 (PTRACE_TYPE_ARG3
)(uintptr_t)
536 /* Copy data to be written over corresponding part of
538 memcpy (buffer
.byte
+ (offset
- rounded_offset
),
539 writebuf
, partial_len
);
542 ptrace (PT_WRITE_D
, pid
,
543 (PTRACE_TYPE_ARG3
)(uintptr_t)rounded_offset
,
547 /* Using the appropriate one (I or D) is necessary for
548 Gould NP1, at least. */
550 ptrace (PT_WRITE_I
, pid
,
551 (PTRACE_TYPE_ARG3
)(uintptr_t)rounded_offset
,
554 return TARGET_XFER_EOF
;
561 buffer
.word
= ptrace (PT_READ_I
, pid
,
562 (PTRACE_TYPE_ARG3
)(uintptr_t)rounded_offset
,
565 return TARGET_XFER_EOF
;
566 /* Copy appropriate bytes out of the buffer. */
567 memcpy (readbuf
, buffer
.byte
+ (offset
- rounded_offset
),
571 *xfered_len
= partial_len
;
572 return TARGET_XFER_OK
;
575 case TARGET_OBJECT_UNWIND_TABLE
:
576 return TARGET_XFER_E_IO
;
578 case TARGET_OBJECT_AUXV
:
579 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
580 /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO
581 request that allows us to read the auxilliary vector. Other
582 BSD's may follow if they feel the need to support PIE. */
584 struct ptrace_io_desc piod
;
587 return TARGET_XFER_E_IO
;
588 piod
.piod_op
= PIOD_READ_AUXV
;
589 piod
.piod_addr
= readbuf
;
590 piod
.piod_offs
= (void *) (long) offset
;
594 if (ptrace (PT_IO
, pid
, (caddr_t
)&piod
, 0) == 0)
596 /* Return the actual number of bytes read or written. */
597 *xfered_len
= piod
.piod_len
;
598 return (piod
.piod_len
== 0) ? TARGET_XFER_EOF
: TARGET_XFER_OK
;
602 return TARGET_XFER_E_IO
;
604 case TARGET_OBJECT_WCOOKIE
:
605 return TARGET_XFER_E_IO
;
608 return TARGET_XFER_E_IO
;
612 /* Return non-zero if the thread specified by PTID is alive. */
615 inf_ptrace_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
617 /* ??? Is kill the right way to do this? */
618 return (kill (ptid_get_pid (ptid
), 0) != -1);
621 /* Print status information about what we're accessing. */
624 inf_ptrace_files_info (struct target_ops
*ignore
)
626 struct inferior
*inf
= current_inferior ();
628 printf_filtered (_("\tUsing the running image of %s %s.\n"),
629 inf
->attach_flag
? "attached" : "child",
630 target_pid_to_str (inferior_ptid
));
634 inf_ptrace_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
636 return normal_pid_to_str (ptid
);
639 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
641 /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
642 Return 0 if *READPTR is already at the end of the buffer.
643 Return -1 if there is insufficient buffer for a whole entry.
644 Return 1 if an entry was read into *TYPEP and *VALP. */
647 inf_ptrace_auxv_parse (struct target_ops
*ops
, gdb_byte
**readptr
,
648 gdb_byte
*endptr
, CORE_ADDR
*typep
, CORE_ADDR
*valp
)
650 struct type
*int_type
= builtin_type (target_gdbarch ())->builtin_int
;
651 struct type
*ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
652 const int sizeof_auxv_type
= TYPE_LENGTH (int_type
);
653 const int sizeof_auxv_val
= TYPE_LENGTH (ptr_type
);
654 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
655 gdb_byte
*ptr
= *readptr
;
660 if (endptr
- ptr
< 2 * sizeof_auxv_val
)
663 *typep
= extract_unsigned_integer (ptr
, sizeof_auxv_type
, byte_order
);
664 ptr
+= sizeof_auxv_val
; /* Alignment. */
665 *valp
= extract_unsigned_integer (ptr
, sizeof_auxv_val
, byte_order
);
666 ptr
+= sizeof_auxv_val
;
674 /* Create a prototype ptrace target. The client can override it with
678 inf_ptrace_target (void)
680 struct target_ops
*t
= inf_child_target ();
682 t
->to_attach
= inf_ptrace_attach
;
683 t
->to_detach
= inf_ptrace_detach
;
684 t
->to_resume
= inf_ptrace_resume
;
685 t
->to_wait
= inf_ptrace_wait
;
686 t
->to_files_info
= inf_ptrace_files_info
;
687 t
->to_kill
= inf_ptrace_kill
;
688 t
->to_create_inferior
= inf_ptrace_create_inferior
;
689 #ifdef PT_GET_PROCESS_STATE
690 t
->to_follow_fork
= inf_ptrace_follow_fork
;
691 t
->to_post_startup_inferior
= inf_ptrace_post_startup_inferior
;
692 t
->to_post_attach
= inf_ptrace_post_attach
;
694 t
->to_mourn_inferior
= inf_ptrace_mourn_inferior
;
695 t
->to_thread_alive
= inf_ptrace_thread_alive
;
696 t
->to_pid_to_str
= inf_ptrace_pid_to_str
;
697 t
->to_stop
= inf_ptrace_stop
;
698 t
->to_xfer_partial
= inf_ptrace_xfer_partial
;
699 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
700 t
->to_auxv_parse
= inf_ptrace_auxv_parse
;
707 /* Pointer to a function that returns the offset within the user area
708 where a particular register is stored. */
709 static CORE_ADDR (*inf_ptrace_register_u_offset
)(struct gdbarch
*, int, int);
711 /* Fetch register REGNUM from the inferior. */
714 inf_ptrace_fetch_register (struct regcache
*regcache
, int regnum
)
716 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
719 PTRACE_TYPE_RET
*buf
;
722 /* This isn't really an address, but ptrace thinks of it as one. */
723 addr
= inf_ptrace_register_u_offset (gdbarch
, regnum
, 0);
724 if (addr
== (CORE_ADDR
)-1
725 || gdbarch_cannot_fetch_register (gdbarch
, regnum
))
727 regcache_raw_supply (regcache
, regnum
, NULL
);
731 /* Cater for systems like GNU/Linux, that implement threads as
732 separate processes. */
733 pid
= ptid_get_lwp (inferior_ptid
);
735 pid
= ptid_get_pid (inferior_ptid
);
737 size
= register_size (gdbarch
, regnum
);
738 gdb_assert ((size
% sizeof (PTRACE_TYPE_RET
)) == 0);
741 /* Read the register contents from the inferior a chunk at a time. */
742 for (i
= 0; i
< size
/ sizeof (PTRACE_TYPE_RET
); i
++)
745 buf
[i
] = ptrace (PT_READ_U
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t)addr
, 0);
747 error (_("Couldn't read register %s (#%d): %s."),
748 gdbarch_register_name (gdbarch
, regnum
),
749 regnum
, safe_strerror (errno
));
751 addr
+= sizeof (PTRACE_TYPE_RET
);
753 regcache_raw_supply (regcache
, regnum
, buf
);
756 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
757 for all registers. */
760 inf_ptrace_fetch_registers (struct target_ops
*ops
,
761 struct regcache
*regcache
, int regnum
)
765 regnum
< gdbarch_num_regs (get_regcache_arch (regcache
));
767 inf_ptrace_fetch_register (regcache
, regnum
);
769 inf_ptrace_fetch_register (regcache
, regnum
);
772 /* Store register REGNUM into the inferior. */
775 inf_ptrace_store_register (const struct regcache
*regcache
, int regnum
)
777 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
780 PTRACE_TYPE_RET
*buf
;
783 /* This isn't really an address, but ptrace thinks of it as one. */
784 addr
= inf_ptrace_register_u_offset (gdbarch
, regnum
, 1);
785 if (addr
== (CORE_ADDR
)-1
786 || gdbarch_cannot_store_register (gdbarch
, regnum
))
789 /* Cater for systems like GNU/Linux, that implement threads as
790 separate processes. */
791 pid
= ptid_get_lwp (inferior_ptid
);
793 pid
= ptid_get_pid (inferior_ptid
);
795 size
= register_size (gdbarch
, regnum
);
796 gdb_assert ((size
% sizeof (PTRACE_TYPE_RET
)) == 0);
799 /* Write the register contents into the inferior a chunk at a time. */
800 regcache_raw_collect (regcache
, regnum
, buf
);
801 for (i
= 0; i
< size
/ sizeof (PTRACE_TYPE_RET
); i
++)
804 ptrace (PT_WRITE_U
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t)addr
, buf
[i
]);
806 error (_("Couldn't write register %s (#%d): %s."),
807 gdbarch_register_name (gdbarch
, regnum
),
808 regnum
, safe_strerror (errno
));
810 addr
+= sizeof (PTRACE_TYPE_RET
);
814 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
815 this for all registers. */
818 inf_ptrace_store_registers (struct target_ops
*ops
,
819 struct regcache
*regcache
, int regnum
)
823 regnum
< gdbarch_num_regs (get_regcache_arch (regcache
));
825 inf_ptrace_store_register (regcache
, regnum
);
827 inf_ptrace_store_register (regcache
, regnum
);
830 /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
831 a function returning the offset within the user area where a
832 particular register is stored. */
835 inf_ptrace_trad_target (CORE_ADDR (*register_u_offset
)
836 (struct gdbarch
*, int, int))
838 struct target_ops
*t
= inf_ptrace_target();
840 gdb_assert (register_u_offset
);
841 inf_ptrace_register_u_offset
= register_u_offset
;
842 t
->to_fetch_registers
= inf_ptrace_fetch_registers
;
843 t
->to_store_registers
= inf_ptrace_store_registers
;