1 /* Low-level child interface to ptrace.
3 Copyright (C) 1988-2018 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/>. */
27 #include "nat/gdb_ptrace.h"
31 #include "inf-ptrace.h"
32 #include "inf-child.h"
33 #include "gdbthread.h"
34 #include "nat/fork-inferior.h"
39 /* A unique_ptr helper to unpush a target. */
41 struct target_unpusher
43 void operator() (struct target_ops
*ops
) const
49 /* A unique_ptr that unpushes a target on destruction. */
51 typedef std::unique_ptr
<struct target_ops
, target_unpusher
> target_unpush_up
;
55 #ifdef PT_GET_PROCESS_STATE
57 /* Target hook for follow_fork. On entry and at return inferior_ptid is
58 the ptid of the followed inferior. */
61 inf_ptrace_follow_fork (struct target_ops
*ops
, int follow_child
,
66 struct thread_info
*tp
= inferior_thread ();
67 pid_t child_pid
= ptid_get_pid (tp
->pending_follow
.value
.related_pid
);
69 /* Breakpoints have already been detached from the child by
72 if (ptrace (PT_DETACH
, child_pid
, (PTRACE_TYPE_ARG3
)1, 0) == -1)
73 perror_with_name (("ptrace"));
80 inf_ptrace_insert_fork_catchpoint (struct target_ops
*self
, int pid
)
86 inf_ptrace_remove_fork_catchpoint (struct target_ops
*self
, int pid
)
91 #endif /* PT_GET_PROCESS_STATE */
94 /* Prepare to be traced. */
99 /* "Trace me, Dr. Memory!" */
100 if (ptrace (PT_TRACE_ME
, 0, (PTRACE_TYPE_ARG3
) 0, 0) < 0)
101 trace_start_error_with_name ("ptrace");
104 /* Start a new inferior Unix child process. EXEC_FILE is the file to
105 run, ALLARGS is a string containing the arguments to the program.
106 ENV is the environment vector to pass. If FROM_TTY is non-zero, be
110 inf_ptrace_create_inferior (struct target_ops
*ops
,
111 const char *exec_file
, const std::string
&allargs
,
112 char **env
, int from_tty
)
117 /* Do not change either targets above or the same target if already present.
118 The reason is the target stack is shared across multiple inferiors. */
119 int ops_already_pushed
= target_is_pushed (ops
);
121 target_unpush_up unpusher
;
122 if (! ops_already_pushed
)
124 /* Clear possible core file with its process_stratum. */
126 unpusher
.reset (ops
);
129 pid
= fork_inferior (exec_file
, allargs
, env
, inf_ptrace_me
, NULL
,
132 ptid
= pid_to_ptid (pid
);
133 /* We have something that executes now. We'll be running through
134 the shell at this point (if startup-with-shell is true), but the
135 pid shouldn't change. */
136 add_thread_silent (ptid
);
140 gdb_startup_inferior (pid
, 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 (ptid
);
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 inf_child_mourn_inferior (ops
);
180 /* Attach to the process specified by ARGS. If FROM_TTY is non-zero,
181 be chatty about it. */
184 inf_ptrace_attach (struct target_ops
*ops
, const char *args
, int from_tty
)
188 struct inferior
*inf
;
190 /* Do not change either targets above or the same target if already present.
191 The reason is the target stack is shared across multiple inferiors. */
192 int ops_already_pushed
= target_is_pushed (ops
);
194 pid
= parse_pid_to_attach (args
);
196 if (pid
== getpid ()) /* Trying to masturbate? */
197 error (_("I refuse to debug myself!"));
199 target_unpush_up unpusher
;
200 if (! ops_already_pushed
)
202 /* target_pid_to_str already uses the target. Also clear possible core
203 file with its process_stratum. */
205 unpusher
.reset (ops
);
210 exec_file
= get_exec_file (0);
213 printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file
,
214 target_pid_to_str (pid_to_ptid (pid
)));
216 printf_unfiltered (_("Attaching to %s\n"),
217 target_pid_to_str (pid_to_ptid (pid
)));
219 gdb_flush (gdb_stdout
);
224 ptrace (PT_ATTACH
, pid
, (PTRACE_TYPE_ARG3
)0, 0);
226 perror_with_name (("ptrace"));
228 error (_("This system does not support attaching to a process"));
231 inf
= current_inferior ();
232 inferior_appeared (inf
, pid
);
233 inf
->attach_flag
= 1;
234 inferior_ptid
= pid_to_ptid (pid
);
236 /* Always add a main thread. If some target extends the ptrace
237 target, it should decorate the ptid later with more info. */
238 thread_info
*thr
= add_thread_silent (inferior_ptid
);
239 /* Don't consider the thread stopped until we've processed its
240 initial SIGSTOP stop. */
241 set_executing (thr
->ptid
, true);
246 #ifdef PT_GET_PROCESS_STATE
249 inf_ptrace_post_attach (struct target_ops
*self
, int pid
)
253 /* Set the initial event mask. */
254 memset (&pe
, 0, sizeof pe
);
255 pe
.pe_set_event
|= PTRACE_FORK
;
256 if (ptrace (PT_SET_EVENT_MASK
, pid
,
257 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
258 perror_with_name (("ptrace"));
263 /* Detach from the inferior. If FROM_TTY is non-zero, be chatty about it. */
266 inf_ptrace_detach (struct target_ops
*ops
, inferior
*inf
, int from_tty
)
268 pid_t pid
= ptid_get_pid (inferior_ptid
);
270 target_announce_detach (from_tty
);
273 /* We'd better not have left any breakpoints in the program or it'll
274 die when it hits one. Also note that this may only work if we
275 previously attached to the inferior. It *might* work if we
276 started the process ourselves. */
278 ptrace (PT_DETACH
, pid
, (PTRACE_TYPE_ARG3
)1, 0);
280 perror_with_name (("ptrace"));
282 error (_("This system does not support detaching from a process"));
285 inf_ptrace_detach_success (ops
, inf
);
288 /* See inf-ptrace.h. */
291 inf_ptrace_detach_success (struct target_ops
*ops
, inferior
*inf
)
293 inferior_ptid
= null_ptid
;
294 detach_inferior (inf
);
296 inf_child_maybe_unpush_target (ops
);
299 /* Kill the inferior. */
302 inf_ptrace_kill (struct target_ops
*ops
)
304 pid_t pid
= ptid_get_pid (inferior_ptid
);
310 ptrace (PT_KILL
, pid
, (PTRACE_TYPE_ARG3
)0, 0);
311 waitpid (pid
, &status
, 0);
313 target_mourn_inferior (inferior_ptid
);
316 /* Return which PID to pass to ptrace in order to observe/control the
317 tracee identified by PTID. */
320 get_ptrace_pid (ptid_t ptid
)
324 /* If we have an LWPID to work with, use it. Otherwise, we're
325 dealing with a non-threaded program/target. */
326 pid
= ptid_get_lwp (ptid
);
328 pid
= ptid_get_pid (ptid
);
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
)
343 if (ptid_equal (minus_one_ptid
, 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 pid
= get_ptrace_pid (ptid
);
350 if (catch_syscall_enabled () > 0)
351 request
= PT_SYSCALL
;
353 request
= PT_CONTINUE
;
357 /* If this system does not support PT_STEP, a higher level
358 function will have called single_step() to transmute the step
359 request into a continue request (by setting breakpoints on
360 all possible successor instructions), so we don't have to
361 worry about that here. */
365 /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from
366 where it was. If GDB wanted it to start some other way, we have
367 already written a new program counter value to the child. */
369 ptrace (request
, pid
, (PTRACE_TYPE_ARG3
)1, gdb_signal_to_host (signal
));
371 perror_with_name (("ptrace"));
374 /* Wait for the child specified by PTID to do something. Return the
375 process ID of the child, or MINUS_ONE_PTID in case of error; store
376 the status in *OURSTATUS. */
379 inf_ptrace_wait (struct target_ops
*ops
,
380 ptid_t ptid
, struct target_waitstatus
*ourstatus
, int options
)
383 int status
, save_errno
;
391 pid
= waitpid (ptid_get_pid (ptid
), &status
, 0);
394 while (pid
== -1 && errno
== EINTR
);
396 clear_sigint_trap ();
400 fprintf_unfiltered (gdb_stderr
,
401 _("Child process unexpectedly missing: %s.\n"),
402 safe_strerror (save_errno
));
404 /* Claim it exited with unknown signal. */
405 ourstatus
->kind
= TARGET_WAITKIND_SIGNALLED
;
406 ourstatus
->value
.sig
= GDB_SIGNAL_UNKNOWN
;
407 return inferior_ptid
;
410 /* Ignore terminated detached child processes. */
411 if (!WIFSTOPPED (status
) && pid
!= ptid_get_pid (inferior_ptid
))
416 #ifdef PT_GET_PROCESS_STATE
417 if (WIFSTOPPED (status
))
422 if (ptrace (PT_GET_PROCESS_STATE
, pid
,
423 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
424 perror_with_name (("ptrace"));
426 switch (pe
.pe_report_event
)
429 ourstatus
->kind
= TARGET_WAITKIND_FORKED
;
430 ourstatus
->value
.related_pid
= pid_to_ptid (pe
.pe_other_pid
);
432 /* Make sure the other end of the fork is stopped too. */
433 fpid
= waitpid (pe
.pe_other_pid
, &status
, 0);
435 perror_with_name (("waitpid"));
437 if (ptrace (PT_GET_PROCESS_STATE
, fpid
,
438 (PTRACE_TYPE_ARG3
)&pe
, sizeof pe
) == -1)
439 perror_with_name (("ptrace"));
441 gdb_assert (pe
.pe_report_event
== PTRACE_FORK
);
442 gdb_assert (pe
.pe_other_pid
== pid
);
443 if (fpid
== ptid_get_pid (inferior_ptid
))
445 ourstatus
->value
.related_pid
= pid_to_ptid (pe
.pe_other_pid
);
446 return pid_to_ptid (fpid
);
449 return pid_to_ptid (pid
);
454 store_waitstatus (ourstatus
, status
);
455 return pid_to_ptid (pid
);
458 /* Transfer data via ptrace into process PID's memory from WRITEBUF, or
459 from process PID's memory into READBUF. Start at target address ADDR
460 and transfer up to LEN bytes. Exactly one of READBUF and WRITEBUF must
461 be non-null. Return the number of transferred bytes. */
464 inf_ptrace_peek_poke (pid_t pid
, gdb_byte
*readbuf
,
465 const gdb_byte
*writebuf
,
466 ULONGEST addr
, ULONGEST len
)
471 /* We transfer aligned words. Thus align ADDR down to a word
472 boundary and determine how many bytes to skip at the
474 ULONGEST skip
= addr
& (sizeof (PTRACE_TYPE_RET
) - 1);
479 n
+= chunk
, addr
+= sizeof (PTRACE_TYPE_RET
), skip
= 0)
481 /* Restrict to a chunk that fits in the current word. */
482 chunk
= std::min (sizeof (PTRACE_TYPE_RET
) - skip
, len
- n
);
484 /* Use a union for type punning. */
487 PTRACE_TYPE_RET word
;
488 gdb_byte byte
[sizeof (PTRACE_TYPE_RET
)];
491 /* Read the word, also when doing a partial word write. */
492 if (readbuf
!= NULL
|| chunk
< sizeof (PTRACE_TYPE_RET
))
495 buf
.word
= ptrace (PT_READ_I
, pid
,
496 (PTRACE_TYPE_ARG3
)(uintptr_t) addr
, 0);
500 memcpy (readbuf
+ n
, buf
.byte
+ skip
, chunk
);
502 if (writebuf
!= NULL
)
504 memcpy (buf
.byte
+ skip
, writebuf
+ n
, chunk
);
506 ptrace (PT_WRITE_D
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t) addr
,
510 /* Using the appropriate one (I or D) is necessary for
511 Gould NP1, at least. */
513 ptrace (PT_WRITE_I
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t) addr
,
524 /* Implement the to_xfer_partial target_ops method. */
526 static enum target_xfer_status
527 inf_ptrace_xfer_partial (struct target_ops
*ops
, enum target_object object
,
528 const char *annex
, gdb_byte
*readbuf
,
529 const gdb_byte
*writebuf
,
530 ULONGEST offset
, ULONGEST len
, ULONGEST
*xfered_len
)
532 pid_t pid
= get_ptrace_pid (inferior_ptid
);
536 case TARGET_OBJECT_MEMORY
:
538 /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO
539 request that promises to be much more efficient in reading
540 and writing data in the traced process's address space. */
542 struct ptrace_io_desc piod
;
544 /* NOTE: We assume that there are no distinct address spaces
545 for instruction and data. However, on OpenBSD 3.9 and
546 later, PIOD_WRITE_D doesn't allow changing memory that's
547 mapped read-only. Since most code segments will be
548 read-only, using PIOD_WRITE_D will prevent us from
549 inserting breakpoints, so we use PIOD_WRITE_I instead. */
550 piod
.piod_op
= writebuf
? PIOD_WRITE_I
: PIOD_READ_D
;
551 piod
.piod_addr
= writebuf
? (void *) writebuf
: readbuf
;
552 piod
.piod_offs
= (void *) (long) offset
;
556 if (ptrace (PT_IO
, pid
, (caddr_t
)&piod
, 0) == 0)
558 /* Return the actual number of bytes read or written. */
559 *xfered_len
= piod
.piod_len
;
560 return (piod
.piod_len
== 0) ? TARGET_XFER_EOF
: TARGET_XFER_OK
;
562 /* If the PT_IO request is somehow not supported, fallback on
563 using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
564 to indicate failure. */
566 return TARGET_XFER_EOF
;
569 *xfered_len
= inf_ptrace_peek_poke (pid
, readbuf
, writebuf
,
571 return *xfered_len
!= 0 ? TARGET_XFER_OK
: TARGET_XFER_EOF
;
573 case TARGET_OBJECT_UNWIND_TABLE
:
574 return TARGET_XFER_E_IO
;
576 case TARGET_OBJECT_AUXV
:
577 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
578 /* OpenBSD 4.5 has a new PIOD_READ_AUXV operation for the PT_IO
579 request that allows us to read the auxilliary vector. Other
580 BSD's may follow if they feel the need to support PIE. */
582 struct ptrace_io_desc piod
;
585 return TARGET_XFER_E_IO
;
586 piod
.piod_op
= PIOD_READ_AUXV
;
587 piod
.piod_addr
= readbuf
;
588 piod
.piod_offs
= (void *) (long) offset
;
592 if (ptrace (PT_IO
, pid
, (caddr_t
)&piod
, 0) == 0)
594 /* Return the actual number of bytes read or written. */
595 *xfered_len
= piod
.piod_len
;
596 return (piod
.piod_len
== 0) ? TARGET_XFER_EOF
: TARGET_XFER_OK
;
600 return TARGET_XFER_E_IO
;
602 case TARGET_OBJECT_WCOOKIE
:
603 return TARGET_XFER_E_IO
;
606 return TARGET_XFER_E_IO
;
610 /* Return non-zero if the thread specified by PTID is alive. */
613 inf_ptrace_thread_alive (struct target_ops
*ops
, ptid_t ptid
)
615 /* ??? Is kill the right way to do this? */
616 return (kill (ptid_get_pid (ptid
), 0) != -1);
619 /* Print status information about what we're accessing. */
622 inf_ptrace_files_info (struct target_ops
*ignore
)
624 struct inferior
*inf
= current_inferior ();
626 printf_filtered (_("\tUsing the running image of %s %s.\n"),
627 inf
->attach_flag
? "attached" : "child",
628 target_pid_to_str (inferior_ptid
));
632 inf_ptrace_pid_to_str (struct target_ops
*ops
, ptid_t ptid
)
634 return normal_pid_to_str (ptid
);
637 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
639 /* Read one auxv entry from *READPTR, not reading locations >= ENDPTR.
640 Return 0 if *READPTR is already at the end of the buffer.
641 Return -1 if there is insufficient buffer for a whole entry.
642 Return 1 if an entry was read into *TYPEP and *VALP. */
645 inf_ptrace_auxv_parse (struct target_ops
*ops
, gdb_byte
**readptr
,
646 gdb_byte
*endptr
, CORE_ADDR
*typep
, CORE_ADDR
*valp
)
648 struct type
*int_type
= builtin_type (target_gdbarch ())->builtin_int
;
649 struct type
*ptr_type
= builtin_type (target_gdbarch ())->builtin_data_ptr
;
650 const int sizeof_auxv_type
= TYPE_LENGTH (int_type
);
651 const int sizeof_auxv_val
= TYPE_LENGTH (ptr_type
);
652 enum bfd_endian byte_order
= gdbarch_byte_order (target_gdbarch ());
653 gdb_byte
*ptr
= *readptr
;
658 if (endptr
- ptr
< 2 * sizeof_auxv_val
)
661 *typep
= extract_unsigned_integer (ptr
, sizeof_auxv_type
, byte_order
);
662 ptr
+= sizeof_auxv_val
; /* Alignment. */
663 *valp
= extract_unsigned_integer (ptr
, sizeof_auxv_val
, byte_order
);
664 ptr
+= sizeof_auxv_val
;
672 /* Create a prototype ptrace target. The client can override it with
676 inf_ptrace_target (void)
678 struct target_ops
*t
= inf_child_target ();
680 t
->to_attach
= inf_ptrace_attach
;
681 t
->to_detach
= inf_ptrace_detach
;
682 t
->to_resume
= inf_ptrace_resume
;
683 t
->to_wait
= inf_ptrace_wait
;
684 t
->to_files_info
= inf_ptrace_files_info
;
685 t
->to_kill
= inf_ptrace_kill
;
686 t
->to_create_inferior
= inf_ptrace_create_inferior
;
687 #ifdef PT_GET_PROCESS_STATE
688 t
->to_follow_fork
= inf_ptrace_follow_fork
;
689 t
->to_insert_fork_catchpoint
= inf_ptrace_insert_fork_catchpoint
;
690 t
->to_remove_fork_catchpoint
= inf_ptrace_remove_fork_catchpoint
;
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_xfer_partial
= inf_ptrace_xfer_partial
;
698 #if defined (PT_IO) && defined (PIOD_READ_AUXV)
699 t
->to_auxv_parse
= inf_ptrace_auxv_parse
;
706 /* Pointer to a function that returns the offset within the user area
707 where a particular register is stored. */
708 static CORE_ADDR (*inf_ptrace_register_u_offset
)(struct gdbarch
*, int, int);
710 /* Fetch register REGNUM from the inferior. */
713 inf_ptrace_fetch_register (struct regcache
*regcache
, int regnum
)
715 struct gdbarch
*gdbarch
= regcache
->arch ();
718 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 pid
= get_ptrace_pid (regcache_get_ptid (regcache
));
733 size
= register_size (gdbarch
, regnum
);
734 gdb_assert ((size
% sizeof (PTRACE_TYPE_RET
)) == 0);
735 buf
= (PTRACE_TYPE_RET
*) alloca (size
);
737 /* Read the register contents from the inferior a chunk at a time. */
738 for (i
= 0; i
< size
/ sizeof (PTRACE_TYPE_RET
); i
++)
741 buf
[i
] = ptrace (PT_READ_U
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t)addr
, 0);
743 error (_("Couldn't read register %s (#%d): %s."),
744 gdbarch_register_name (gdbarch
, regnum
),
745 regnum
, safe_strerror (errno
));
747 addr
+= sizeof (PTRACE_TYPE_RET
);
749 regcache_raw_supply (regcache
, regnum
, buf
);
752 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
753 for all registers. */
756 inf_ptrace_fetch_registers (struct target_ops
*ops
,
757 struct regcache
*regcache
, int regnum
)
761 regnum
< gdbarch_num_regs (regcache
->arch ());
763 inf_ptrace_fetch_register (regcache
, regnum
);
765 inf_ptrace_fetch_register (regcache
, regnum
);
768 /* Store register REGNUM into the inferior. */
771 inf_ptrace_store_register (const struct regcache
*regcache
, int regnum
)
773 struct gdbarch
*gdbarch
= regcache
->arch ();
776 PTRACE_TYPE_RET
*buf
;
780 /* This isn't really an address, but ptrace thinks of it as one. */
781 addr
= inf_ptrace_register_u_offset (gdbarch
, regnum
, 1);
782 if (addr
== (CORE_ADDR
)-1
783 || gdbarch_cannot_store_register (gdbarch
, regnum
))
786 pid
= get_ptrace_pid (regcache_get_ptid (regcache
));
788 size
= register_size (gdbarch
, regnum
);
789 gdb_assert ((size
% sizeof (PTRACE_TYPE_RET
)) == 0);
790 buf
= (PTRACE_TYPE_RET
*) alloca (size
);
792 /* Write the register contents into the inferior a chunk at a time. */
793 regcache_raw_collect (regcache
, regnum
, buf
);
794 for (i
= 0; i
< size
/ sizeof (PTRACE_TYPE_RET
); i
++)
797 ptrace (PT_WRITE_U
, pid
, (PTRACE_TYPE_ARG3
)(uintptr_t)addr
, buf
[i
]);
799 error (_("Couldn't write register %s (#%d): %s."),
800 gdbarch_register_name (gdbarch
, regnum
),
801 regnum
, safe_strerror (errno
));
803 addr
+= sizeof (PTRACE_TYPE_RET
);
807 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
808 this for all registers. */
811 inf_ptrace_store_registers (struct target_ops
*ops
,
812 struct regcache
*regcache
, int regnum
)
816 regnum
< gdbarch_num_regs (regcache
->arch ());
818 inf_ptrace_store_register (regcache
, regnum
);
820 inf_ptrace_store_register (regcache
, regnum
);
823 /* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
824 a function returning the offset within the user area where a
825 particular register is stored. */
828 inf_ptrace_trad_target (CORE_ADDR (*register_u_offset
)
829 (struct gdbarch
*, int, int))
831 struct target_ops
*t
= inf_ptrace_target();
833 gdb_assert (register_u_offset
);
834 inf_ptrace_register_u_offset
= register_u_offset
;
835 t
->to_fetch_registers
= inf_ptrace_fetch_registers
;
836 t
->to_store_registers
= inf_ptrace_store_registers
;