961cb7b5cc
writebuf to `gdb_byte *'. * sparc-nat.c (sparc_xfer_wcookie, sparc_xfer_partial): Change type of readbuf and writebuf to `gdb_byte *'. * bsd-uthread.c (bsd_uthread_xfer_partial): Change type of readbuf and writebuf to `gdb_byte *'. * inf-ptrace.c (inf_ptrace_xfer_partial): Change type of readbuf and writebuf to `gdb_byte *'. * bsd-kvm.c (bsd_kvm_xfer_memory): Replace. (bsd_kvm_xfer_partial): New function. (bsd_kvm_add_target): Set to_xfer_partial instead of to_xfer_memory. * bfd-target.c (target_bfd_xfer_partial): Change type of readbuf and writebuf to `gdb_byte *'. * target.c (deprecated_debug_xfer_memory): Remove prototype. (deprecated_debug_xfer_memory): Change type of second argument to `gdb_byte *'. * remote.c (remote_xfer_memory): Remove prototype. (remote_xfer_memory): Change type of second argument to `gdb_byte *'. (remote_xfer_partial): Change type of readbuf and writebuf to `gdb_byte *'.
684 lines
19 KiB
C
684 lines
19 KiB
C
/* Low-level child interface to ptrace.
|
||
|
||
Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
|
||
1998, 1999, 2000, 2001, 2002, 2004, 2005
|
||
Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "command.h"
|
||
#include "inferior.h"
|
||
#include "inflow.h"
|
||
#include "gdbcore.h"
|
||
#include "observer.h"
|
||
#include "regcache.h"
|
||
|
||
#include "gdb_assert.h"
|
||
#include "gdb_string.h"
|
||
#include "gdb_ptrace.h"
|
||
#include "gdb_wait.h"
|
||
#include <signal.h>
|
||
|
||
#include "inf-child.h"
|
||
|
||
/* HACK: Save the ptrace ops returned by inf_ptrace_target. */
|
||
static struct target_ops *ptrace_ops_hack;
|
||
|
||
static void
|
||
inf_ptrace_kill_inferior (void)
|
||
{
|
||
int status;
|
||
int pid = PIDGET (inferior_ptid);
|
||
|
||
if (pid == 0)
|
||
return;
|
||
|
||
/* This once used to call "kill" to kill the inferior just in case
|
||
the inferior was still running. As others have noted in the past
|
||
(kingdon) there shouldn't be any way to get here if the inferior
|
||
is still running -- else there's a major problem elsewere in GDB
|
||
and it needs to be fixed.
|
||
|
||
The kill call causes problems under HP-UX 10, so it's been
|
||
removed; if this causes problems we'll deal with them as they
|
||
arise. */
|
||
ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0);
|
||
wait (&status);
|
||
target_mourn_inferior ();
|
||
}
|
||
|
||
/* Resume execution of the inferior process. If STEP is nonzero,
|
||
single-step it. If SIGNAL is nonzero, give it that signal. */
|
||
|
||
static void
|
||
inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal)
|
||
{
|
||
int request = PT_CONTINUE;
|
||
int pid = PIDGET (ptid);
|
||
|
||
if (pid == -1)
|
||
/* Resume all threads. */
|
||
/* I think this only gets used in the non-threaded case, where
|
||
"resume all threads" and "resume inferior_ptid" are the
|
||
same. */
|
||
pid = PIDGET (inferior_ptid);
|
||
|
||
if (step)
|
||
{
|
||
/* If this system does not support PT_STEP, a higher level
|
||
function will have called single_step() to transmute the step
|
||
request into a continue request (by setting breakpoints on
|
||
all possible successor instructions), so we don't have to
|
||
worry about that here. */
|
||
request = PT_STEP;
|
||
}
|
||
|
||
/* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from
|
||
where it was. If GDB wanted it to start some other way, we have
|
||
already written a new PC value to the child. */
|
||
errno = 0;
|
||
ptrace (request, pid, (PTRACE_TYPE_ARG3) 1, target_signal_to_host (signal));
|
||
if (errno != 0)
|
||
perror_with_name (("ptrace"));
|
||
}
|
||
|
||
/* Wait for child to do something. Return pid of child, or -1 in case
|
||
of error; store status through argument pointer OURSTATUS. */
|
||
|
||
static ptid_t
|
||
inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
||
{
|
||
int save_errno;
|
||
int status;
|
||
char *execd_pathname = NULL;
|
||
int exit_status;
|
||
int related_pid;
|
||
int syscall_id;
|
||
enum target_waitkind kind;
|
||
int pid;
|
||
|
||
do
|
||
{
|
||
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
||
attached process. */
|
||
set_sigio_trap ();
|
||
|
||
pid = wait (&status);
|
||
|
||
save_errno = errno;
|
||
|
||
clear_sigio_trap ();
|
||
|
||
clear_sigint_trap ();
|
||
|
||
if (pid == -1)
|
||
{
|
||
if (save_errno == EINTR)
|
||
continue;
|
||
|
||
fprintf_unfiltered (gdb_stderr,
|
||
"Child process unexpectedly missing: %s.\n",
|
||
safe_strerror (save_errno));
|
||
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
|
||
return pid_to_ptid (-1);
|
||
}
|
||
|
||
/* Did it exit? */
|
||
if (target_has_exited (pid, status, &exit_status))
|
||
{
|
||
/* ??rehrauer: For now, ignore this. */
|
||
continue;
|
||
}
|
||
|
||
if (!target_thread_alive (pid_to_ptid (pid)))
|
||
{
|
||
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
||
return pid_to_ptid (pid);
|
||
}
|
||
}
|
||
while (pid != PIDGET (inferior_ptid)); /* Some other child died or
|
||
stopped. */
|
||
|
||
store_waitstatus (ourstatus, status);
|
||
return pid_to_ptid (pid);
|
||
}
|
||
|
||
/* Check to see if the given thread is alive.
|
||
|
||
FIXME: Is kill() ever the right way to do this? I doubt it, but
|
||
for now we're going to try and be compatable with the old thread
|
||
code. */
|
||
|
||
static int
|
||
inf_ptrace_thread_alive (ptid_t ptid)
|
||
{
|
||
pid_t pid = PIDGET (ptid);
|
||
|
||
return (kill (pid, 0) != -1);
|
||
}
|
||
|
||
/* Attach to process PID, then initialize for debugging it. */
|
||
|
||
static void
|
||
inf_ptrace_attach (char *args, int from_tty)
|
||
{
|
||
char *exec_file;
|
||
int pid;
|
||
char *dummy;
|
||
|
||
if (!args)
|
||
error_no_arg (_("process-id to attach"));
|
||
|
||
dummy = args;
|
||
pid = strtol (args, &dummy, 0);
|
||
/* Some targets don't set errno on errors, grrr! */
|
||
if (pid == 0 && args == dummy)
|
||
error (_("Illegal process-id: %s."), args);
|
||
|
||
if (pid == getpid ()) /* Trying to masturbate? */
|
||
error (_("I refuse to debug myself!"));
|
||
|
||
if (from_tty)
|
||
{
|
||
exec_file = (char *) get_exec_file (0);
|
||
|
||
if (exec_file)
|
||
printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file,
|
||
target_pid_to_str (pid_to_ptid (pid)));
|
||
else
|
||
printf_unfiltered (_("Attaching to %s\n"),
|
||
target_pid_to_str (pid_to_ptid (pid)));
|
||
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
|
||
#ifdef PT_ATTACH
|
||
errno = 0;
|
||
ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3) 0, 0);
|
||
if (errno != 0)
|
||
perror_with_name (("ptrace"));
|
||
attach_flag = 1;
|
||
#else
|
||
error (_("This system does not support attaching to a process"));
|
||
#endif
|
||
|
||
inferior_ptid = pid_to_ptid (pid);
|
||
push_target (ptrace_ops_hack);
|
||
|
||
/* Do this first, before anything has had a chance to query the
|
||
inferior's symbol table or similar. */
|
||
observer_notify_inferior_created (¤t_target, from_tty);
|
||
}
|
||
|
||
static void
|
||
inf_ptrace_post_attach (int pid)
|
||
{
|
||
/* This version of Unix doesn't require a meaningful "post attach"
|
||
operation by a debugger. */
|
||
}
|
||
|
||
/* Take a program previously attached to and detaches it. The program
|
||
resumes execution and will no longer stop on signals, etc. We'd
|
||
better not have left any breakpoints in the program or it'll die
|
||
when it hits one. For this to work, it may be necessary for the
|
||
process to have been previously attached. It *might* work if the
|
||
program was started via the normal ptrace (PTRACE_TRACEME). */
|
||
|
||
static void
|
||
inf_ptrace_detach (char *args, int from_tty)
|
||
{
|
||
int sig = 0;
|
||
int pid = PIDGET (inferior_ptid);
|
||
|
||
if (from_tty)
|
||
{
|
||
char *exec_file = get_exec_file (0);
|
||
if (exec_file == 0)
|
||
exec_file = "";
|
||
printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file,
|
||
target_pid_to_str (pid_to_ptid (pid)));
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
if (args)
|
||
sig = atoi (args);
|
||
|
||
#ifdef PT_DETACH
|
||
errno = 0;
|
||
ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3) 1, sig);
|
||
if (errno != 0)
|
||
perror_with_name (("ptrace"));
|
||
attach_flag = 0;
|
||
#else
|
||
error (_("This system does not support detaching from a process"));
|
||
#endif
|
||
|
||
inferior_ptid = null_ptid;
|
||
unpush_target (ptrace_ops_hack);
|
||
}
|
||
|
||
/* Print status information about what we're accessing. */
|
||
|
||
static void
|
||
inf_ptrace_files_info (struct target_ops *ignore)
|
||
{
|
||
printf_unfiltered (_("\tUsing the running image of %s %s.\n"),
|
||
attach_flag ? "attached" : "child",
|
||
target_pid_to_str (inferior_ptid));
|
||
}
|
||
|
||
static void
|
||
inf_ptrace_open (char *arg, int from_tty)
|
||
{
|
||
error (_("Use the \"run\" command to start a Unix child process."));
|
||
}
|
||
|
||
/* Stub function which causes the inferior that runs it, to be ptrace-able
|
||
by its parent process. */
|
||
|
||
static void
|
||
inf_ptrace_me (void)
|
||
{
|
||
/* "Trace me, Dr. Memory!" */
|
||
ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0);
|
||
}
|
||
|
||
/* Stub function which causes the GDB that runs it, to start ptrace-ing
|
||
the child process. */
|
||
|
||
static void
|
||
inf_ptrace_him (int pid)
|
||
{
|
||
push_target (ptrace_ops_hack);
|
||
|
||
/* On some targets, there must be some explicit synchronization
|
||
between the parent and child processes after the debugger
|
||
forks, and before the child execs the debuggee program. This
|
||
call basically gives permission for the child to exec. */
|
||
|
||
target_acknowledge_created_inferior (pid);
|
||
|
||
/* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will
|
||
be 1 or 2 depending on whether we're starting without or with a
|
||
shell. */
|
||
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
|
||
|
||
/* On some targets, there must be some explicit actions taken after
|
||
the inferior has been started up. */
|
||
target_post_startup_inferior (pid_to_ptid (pid));
|
||
}
|
||
|
||
/* Start an inferior Unix child process and sets inferior_ptid to its
|
||
pid. EXEC_FILE is the file to run. ALLARGS is a string containing
|
||
the arguments to the program. ENV is the environment vector to
|
||
pass. Errors reported with error(). */
|
||
|
||
static void
|
||
inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env,
|
||
int from_tty)
|
||
{
|
||
fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him,
|
||
NULL, NULL);
|
||
/* We are at the first instruction we care about. */
|
||
observer_notify_inferior_created (¤t_target, from_tty);
|
||
/* Pedal to the metal... */
|
||
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
static int
|
||
inf_ptrace_reported_exec_events_per_exec_call (void)
|
||
{
|
||
/* Typically, we get a single SIGTRAP per exec. */
|
||
return 1;
|
||
}
|
||
|
||
static int
|
||
inf_ptrace_has_exited (int pid, int wait_status, int *exit_status)
|
||
{
|
||
if (WIFEXITED (wait_status))
|
||
{
|
||
*exit_status = WEXITSTATUS (wait_status);
|
||
return 1;
|
||
}
|
||
|
||
if (WIFSIGNALED (wait_status))
|
||
{
|
||
*exit_status = 0; /* ?? Don't know what else to say here. */
|
||
return 1;
|
||
}
|
||
|
||
/* ??? Do we really need to consult the event state, too?
|
||
Assume the wait_state alone suffices. */
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
inf_ptrace_mourn_inferior (void)
|
||
{
|
||
unpush_target (ptrace_ops_hack);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static int
|
||
inf_ptrace_can_run (void)
|
||
{
|
||
return 1;
|
||
}
|
||
|
||
/* Send a SIGINT to the process group. This acts just like the user
|
||
typed a ^C on the controlling terminal.
|
||
|
||
FIXME: This may not be correct for all systems. Some may want to
|
||
use killpg() instead of kill (-pgrp). */
|
||
|
||
static void
|
||
inf_ptrace_stop (void)
|
||
{
|
||
kill (-inferior_process_group, SIGINT);
|
||
}
|
||
|
||
/* Perform a partial transfer to/from the specified object. For
|
||
memory transfers, fall back to the old memory xfer functions. */
|
||
|
||
static LONGEST
|
||
inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, LONGEST len)
|
||
{
|
||
switch (object)
|
||
{
|
||
case TARGET_OBJECT_MEMORY:
|
||
#ifdef PT_IO
|
||
/* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO
|
||
request that promises to be much more efficient in reading
|
||
and writing data in the traced process's address space. */
|
||
{
|
||
struct ptrace_io_desc piod;
|
||
|
||
/* NOTE: We assume that there are no distinct address spaces
|
||
for instruction and data. */
|
||
piod.piod_op = writebuf ? PIOD_WRITE_D : PIOD_READ_D;
|
||
piod.piod_addr = writebuf ? (void *) writebuf : readbuf;
|
||
piod.piod_offs = (void *) (long) offset;
|
||
piod.piod_len = len;
|
||
|
||
errno = 0;
|
||
if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == 0)
|
||
/* Return the actual number of bytes read or written. */
|
||
return piod.piod_len;
|
||
/* If the PT_IO request is somehow not supported, fallback on
|
||
using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
|
||
to indicate failure. */
|
||
if (errno != EINVAL)
|
||
return 0;
|
||
}
|
||
#endif
|
||
{
|
||
union
|
||
{
|
||
PTRACE_TYPE_RET word;
|
||
unsigned char byte[sizeof (PTRACE_TYPE_RET)];
|
||
} buffer;
|
||
ULONGEST rounded_offset;
|
||
LONGEST partial_len;
|
||
|
||
/* Round the start offset down to the next long word
|
||
boundary. */
|
||
rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
|
||
|
||
/* Since ptrace will transfer a single word starting at that
|
||
rounded_offset the partial_len needs to be adjusted down to
|
||
that (remember this function only does a single transfer).
|
||
Should the required length be even less, adjust it down
|
||
again. */
|
||
partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
|
||
if (partial_len > len)
|
||
partial_len = len;
|
||
|
||
if (writebuf)
|
||
{
|
||
/* If OFFSET:PARTIAL_LEN is smaller than
|
||
ROUNDED_OFFSET:WORDSIZE then a read/modify write will
|
||
be needed. Read in the entire word. */
|
||
if (rounded_offset < offset
|
||
|| (offset + partial_len
|
||
< rounded_offset + sizeof (PTRACE_TYPE_RET)))
|
||
/* Need part of initial word -- fetch it. */
|
||
buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid),
|
||
(PTRACE_TYPE_ARG3) (long) rounded_offset,
|
||
0);
|
||
|
||
/* Copy data to be written over corresponding part of
|
||
buffer. */
|
||
memcpy (buffer.byte + (offset - rounded_offset),
|
||
writebuf, partial_len);
|
||
|
||
errno = 0;
|
||
ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
|
||
(PTRACE_TYPE_ARG3) (long) rounded_offset,
|
||
buffer.word);
|
||
if (errno)
|
||
{
|
||
/* Using the appropriate one (I or D) is necessary for
|
||
Gould NP1, at least. */
|
||
errno = 0;
|
||
ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
|
||
(PTRACE_TYPE_ARG3) (long) rounded_offset,
|
||
buffer.word);
|
||
if (errno)
|
||
return 0;
|
||
}
|
||
}
|
||
if (readbuf)
|
||
{
|
||
errno = 0;
|
||
buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid),
|
||
(PTRACE_TYPE_ARG3) (long) rounded_offset, 0);
|
||
if (errno)
|
||
return 0;
|
||
/* Copy appropriate bytes out of the buffer. */
|
||
memcpy (readbuf, buffer.byte + (offset - rounded_offset),
|
||
partial_len);
|
||
}
|
||
return partial_len;
|
||
}
|
||
|
||
case TARGET_OBJECT_UNWIND_TABLE:
|
||
return -1;
|
||
|
||
case TARGET_OBJECT_AUXV:
|
||
return -1;
|
||
|
||
case TARGET_OBJECT_WCOOKIE:
|
||
return -1;
|
||
|
||
default:
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
static char *
|
||
inf_ptrace_pid_to_str (ptid_t ptid)
|
||
{
|
||
return normal_pid_to_str (ptid);
|
||
}
|
||
|
||
/* Create a prototype ptrace target. The client can override it with
|
||
local methods. */
|
||
|
||
struct target_ops *
|
||
inf_ptrace_target (void)
|
||
{
|
||
struct target_ops *t = inf_child_target ();
|
||
|
||
t->to_open = inf_ptrace_open;
|
||
t->to_attach = inf_ptrace_attach;
|
||
t->to_post_attach = inf_ptrace_post_attach;
|
||
t->to_detach = inf_ptrace_detach;
|
||
t->to_resume = inf_ptrace_resume;
|
||
t->to_wait = inf_ptrace_wait;
|
||
t->to_xfer_partial = inf_ptrace_xfer_partial;
|
||
t->to_files_info = inf_ptrace_files_info;
|
||
t->to_kill = inf_ptrace_kill_inferior;
|
||
t->to_create_inferior = inf_ptrace_create_inferior;
|
||
t->to_reported_exec_events_per_exec_call =
|
||
inf_ptrace_reported_exec_events_per_exec_call;
|
||
t->to_has_exited = inf_ptrace_has_exited;
|
||
t->to_mourn_inferior = inf_ptrace_mourn_inferior;
|
||
t->to_can_run = inf_ptrace_can_run;
|
||
t->to_thread_alive = inf_ptrace_thread_alive;
|
||
t->to_pid_to_str = inf_ptrace_pid_to_str;
|
||
t->to_stop = inf_ptrace_stop;
|
||
t->to_stratum = process_stratum;
|
||
t->to_has_all_memory = 1;
|
||
t->to_has_memory = 1;
|
||
t->to_has_stack = 1;
|
||
t->to_has_registers = 1;
|
||
t->to_has_execution = 1;
|
||
t->to_magic = OPS_MAGIC;
|
||
ptrace_ops_hack = t;
|
||
|
||
return t;
|
||
}
|
||
|
||
|
||
/* Pointer to a function that returns the oggset within the user area
|
||
where a particular register is stored. */
|
||
static CORE_ADDR (*inf_ptrace_register_u_offset)(int);
|
||
|
||
/* Fetch register REGNUM from the inferior. */
|
||
|
||
static void
|
||
inf_ptrace_fetch_register (int regnum)
|
||
{
|
||
CORE_ADDR addr;
|
||
size_t size;
|
||
PTRACE_TYPE_RET *buf;
|
||
int pid, i;
|
||
|
||
/* Cater for systems like GNU/Linux, that implement threads as
|
||
seperate processes. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* This isn't really an address, but ptrace thinks of it as one. */
|
||
addr = inf_ptrace_register_u_offset (regnum);
|
||
size = register_size (current_gdbarch, regnum);
|
||
|
||
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
||
buf = alloca (size);
|
||
|
||
/* Read the register contents from the inferior a chuck at the time. */
|
||
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
||
{
|
||
errno = 0;
|
||
buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) addr, 0);
|
||
if (errno != 0)
|
||
error (_("Couldn't read register %s (#%d): %s."), REGISTER_NAME (regnum),
|
||
regnum, safe_strerror (errno));
|
||
|
||
addr += sizeof (PTRACE_TYPE_RET);
|
||
}
|
||
regcache_raw_supply (current_regcache, regnum, buf);
|
||
}
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers. */
|
||
|
||
static void
|
||
inf_ptrace_fetch_registers (int regnum)
|
||
{
|
||
if (regnum == -1)
|
||
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
||
inf_ptrace_fetch_register (regnum);
|
||
else
|
||
inf_ptrace_fetch_register (regnum);
|
||
}
|
||
|
||
/* Store register REGNUM into the inferior. */
|
||
|
||
static void
|
||
inf_ptrace_store_register (int regnum)
|
||
{
|
||
CORE_ADDR addr;
|
||
size_t size;
|
||
PTRACE_TYPE_RET *buf;
|
||
int pid, i;
|
||
|
||
/* Cater for systems like GNU/Linux, that implement threads as
|
||
seperate processes. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* This isn't really an address, but ptrace thinks of it as one. */
|
||
addr = inf_ptrace_register_u_offset (regnum);
|
||
size = register_size (current_gdbarch, regnum);
|
||
|
||
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
||
buf = alloca (size);
|
||
|
||
/* Write the register contents into the inferior a chunk at the time. */
|
||
regcache_raw_collect (current_regcache, regnum, buf);
|
||
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
||
{
|
||
errno = 0;
|
||
ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) addr, buf[i]);
|
||
if (errno != 0)
|
||
error (_("Couldn't write register %s (#%d): %s."), REGISTER_NAME (regnum),
|
||
regnum, safe_strerror (errno));
|
||
|
||
addr += sizeof (PTRACE_TYPE_RET);
|
||
}
|
||
}
|
||
|
||
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
||
this for all registers. */
|
||
|
||
void
|
||
inf_ptrace_store_registers (int regnum)
|
||
{
|
||
if (regnum == -1)
|
||
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
||
inf_ptrace_store_register (regnum);
|
||
else
|
||
inf_ptrace_store_register (regnum);
|
||
}
|
||
|
||
/* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
|
||
a function returning the offset within the user area where a
|
||
particular register is stored. */
|
||
|
||
struct target_ops *
|
||
inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(int))
|
||
{
|
||
struct target_ops *t = inf_ptrace_target();
|
||
|
||
gdb_assert (register_u_offset);
|
||
inf_ptrace_register_u_offset = register_u_offset;
|
||
t->to_fetch_registers = inf_ptrace_fetch_registers;
|
||
t->to_store_registers = inf_ptrace_store_registers;
|
||
|
||
return t;
|
||
}
|