/* Low-level child interface to ptrace.
- Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1998, 1999, 2000, 2001, 2002, 2004, 2005
+ Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
+ 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007
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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "command.h"
#include "inferior.h"
#include "inflow.h"
#include "gdbcore.h"
-#include "observer.h"
#include "regcache.h"
+#include "gdb_stdint.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include "gdb_ptrace.h"
/* HACK: Save the ptrace ops returned by inf_ptrace_target. */
static struct target_ops *ptrace_ops_hack;
+\f
-static void
-inf_ptrace_kill_inferior (void)
+#ifdef PT_GET_PROCESS_STATE
+
+static int
+inf_ptrace_follow_fork (struct target_ops *ops, int follow_child)
{
- int status;
- int pid = PIDGET (inferior_ptid);
+ pid_t pid, fpid;
+ ptrace_state_t pe;
- if (pid == 0)
- return;
+ /* FIXME: kettenis/20050720: This stuff should really be passed as
+ an argument by our caller. */
+ {
+ ptid_t ptid;
+ struct target_waitstatus status;
- /* 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 ();
-}
+ get_last_target_status (&ptid, &status);
+ gdb_assert (status.kind == TARGET_WAITKIND_FORKED);
-/* Resume execution of the inferior process. If STEP is nonzero,
- single-step it. If SIGNAL is nonzero, give it that signal. */
+ pid = ptid_get_pid (ptid);
+ }
-static void
-inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal)
-{
- int request = PT_CONTINUE;
- int pid = PIDGET (ptid);
+ if (ptrace (PT_GET_PROCESS_STATE, pid,
+ (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
+ perror_with_name (("ptrace"));
- 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);
+ gdb_assert (pe.pe_report_event == PTRACE_FORK);
+ fpid = pe.pe_other_pid;
- if (step)
+ if (follow_child)
{
- /* 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;
+ inferior_ptid = pid_to_ptid (fpid);
+ detach_breakpoints (pid);
+
+ /* Reset breakpoints in the child as appropriate. */
+ follow_inferior_reset_breakpoints ();
+
+ if (ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
+ perror_with_name (("ptrace"));
}
+ else
+ {
+ inferior_ptid = pid_to_ptid (pid);
+ detach_breakpoints (fpid);
- /* 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");
+ if (ptrace (PT_DETACH, fpid, (PTRACE_TYPE_ARG3)1, 0) == -1)
+ perror_with_name (("ptrace"));
+ }
+
+ return 0;
}
-/* Wait for child to do something. Return pid of child, or -1 in case
- of error; store status through argument pointer OURSTATUS. */
+#endif /* PT_GET_PROCESS_STATE */
+\f
-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;
+/* Prepare to be traced. */
- do
- {
- set_sigint_trap (); /* Causes SIGINT to be passed on to the
- attached process. */
- set_sigio_trap ();
+static void
+inf_ptrace_me (void)
+{
+ /* "Trace me, Dr. Memory!" */
+ ptrace (PT_TRACE_ME, 0, (PTRACE_TYPE_ARG3)0, 0);
+}
- pid = wait (&status);
+/* Start tracing PID. */
- save_errno = errno;
+static void
+inf_ptrace_him (int pid)
+{
+ push_target (ptrace_ops_hack);
- clear_sigio_trap ();
+ /* 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. */
- clear_sigint_trap ();
+ target_acknowledge_created_inferior (pid);
- if (pid == -1)
- {
- if (save_errno == EINTR)
- continue;
+ /* 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);
- fprintf_unfiltered (gdb_stderr,
- "Child process unexpectedly missing: %s.\n",
- safe_strerror (save_errno));
+ /* 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));
+}
- /* Claim it exited with unknown signal. */
- ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
- ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
- return pid_to_ptid (-1);
- }
+/* Start a new inferior Unix child process. EXEC_FILE is the file to
+ run, ALLARGS is a string containing the arguments to the program.
+ ENV is the environment vector to pass. If FROM_TTY is non-zero, be
+ chatty about it. */
- /* Did it exit? */
- if (target_has_exited (pid, status, &exit_status))
- {
- /* ??rehrauer: For now, ignore this. */
- continue;
- }
+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);
+}
- 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. */
+#ifdef PT_GET_PROCESS_STATE
- store_waitstatus (ourstatus, status);
- return pid_to_ptid (pid);
+static void
+inf_ptrace_post_startup_inferior (ptid_t pid)
+{
+ ptrace_event_t pe;
+
+ /* Set the initial event mask. */
+ memset (&pe, 0, sizeof pe);
+ pe.pe_set_event |= PTRACE_FORK;
+ if (ptrace (PT_SET_EVENT_MASK, ptid_get_pid (pid),
+ (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
+ perror_with_name (("ptrace"));
}
-/* Check to see if the given thread is alive.
+#endif
- 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. */
+/* Clean up a rotting corpse of an inferior after it died. */
-static int
-inf_ptrace_thread_alive (ptid_t ptid)
+static void
+inf_ptrace_mourn_inferior (void)
{
- pid_t pid = PIDGET (ptid);
+ int status;
- return (kill (pid, 0) != -1);
+ /* Wait just one more time to collect the inferior's exit status.
+ Do not check whether this succeeds though, since we may be
+ dealing with a process that we attached to. Such a process will
+ only report its exit status to its original parent. */
+ waitpid (ptid_get_pid (inferior_ptid), &status, 0);
+
+ unpush_target (ptrace_ops_hack);
+ generic_mourn_inferior ();
}
-/* Attach to process PID, then initialize for debugging it. */
+/* Attach to the process specified by ARGS. If FROM_TTY is non-zero,
+ be chatty about it. */
static void
inf_ptrace_attach (char *args, int from_tty)
{
char *exec_file;
- int pid;
+ pid_t pid;
char *dummy;
if (!args)
- error_no_arg ("process-id to attach");
+ error_no_arg (_("process-id to attach"));
dummy = args;
pid = strtol (args, &dummy, 0);
if (from_tty)
{
- exec_file = (char *) get_exec_file (0);
+ exec_file = get_exec_file (0);
if (exec_file)
- printf_unfiltered ("Attaching to program: %s, %s\n", 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",
+ 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);
+ ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3)0, 0);
if (errno != 0)
- perror_with_name ("ptrace");
+ perror_with_name (("ptrace"));
attach_flag = 1;
#else
error (_("This system does not support attaching to a process"));
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
+#ifdef PT_GET_PROCESS_STATE
+
+void
inf_ptrace_post_attach (int pid)
{
- /* This version of Unix doesn't require a meaningful "post attach"
- operation by a debugger. */
+ ptrace_event_t pe;
+
+ /* Set the initial event mask. */
+ memset (&pe, 0, sizeof pe);
+ pe.pe_set_event |= PTRACE_FORK;
+ if (ptrace (PT_SET_EVENT_MASK, pid,
+ (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
+ perror_with_name (("ptrace"));
}
-/* 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). */
+#endif
+
+/* Detach from the inferior, optionally passing it the signal
+ specified by ARGS. If FROM_TTY is non-zero, be chatty about it. */
static void
inf_ptrace_detach (char *args, int from_tty)
{
+ pid_t pid = ptid_get_pid (inferior_ptid);
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,
+ printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file,
target_pid_to_str (pid_to_ptid (pid)));
gdb_flush (gdb_stdout);
}
sig = atoi (args);
#ifdef PT_DETACH
+ /* We'd better not have left any breakpoints in the program or it'll
+ die when it hits one. Also note that this may only work if we
+ previously attached to the inferior. It *might* work if we
+ started the process ourselves. */
errno = 0;
- ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3) 1, sig);
+ ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3)1, sig);
if (errno != 0)
- perror_with_name ("ptrace");
+ perror_with_name (("ptrace"));
attach_flag = 0;
#else
error (_("This system does not support detaching from a process"));
unpush_target (ptrace_ops_hack);
}
-/* Print status information about what we're accessing. */
+/* Kill the inferior. */
static void
-inf_ptrace_files_info (struct target_ops *ignore)
+inf_ptrace_kill (void)
{
- printf_unfiltered ("\tUsing the running image of %s %s.\n",
- attach_flag ? "attached" : "child",
- target_pid_to_str (inferior_ptid));
-}
+ pid_t pid = ptid_get_pid (inferior_ptid);
+ int status;
-static void
-inf_ptrace_open (char *arg, int from_tty)
-{
- error (_("Use the \"run\" command to start a Unix child process."));
+ if (pid == 0)
+ return;
+
+ ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3)0, 0);
+ waitpid (pid, &status, 0);
+
+ target_mourn_inferior ();
}
-/* Stub function which causes the inferior that runs it, to be ptrace-able
- by its parent process. */
+/* Stop the inferior. */
static void
-inf_ptrace_me (void)
+inf_ptrace_stop (void)
{
- /* "Trace me, Dr. Memory!" */
- ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0);
+ /* Send a SIGINT to the process group. This acts just like the user
+ typed a ^C on the controlling terminal. Note that using a
+ negative process number in kill() is a System V-ism. The proper
+ BSD interface is killpg(). However, all modern BSDs support the
+ System V interface too. */
+ kill (-inferior_process_group, SIGINT);
}
-/* Stub function which causes the GDB that runs it, to start ptrace-ing
- the child process. */
+/* Resume execution of thread PTID, or all threads if PTID is -1. If
+ STEP is nonzero, single-step it. If SIGNAL is nonzero, give it
+ that signal. */
static void
-inf_ptrace_him (int pid)
+inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal)
{
- 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. */
+ pid_t pid = ptid_get_pid (ptid);
+ int request = PT_CONTINUE;
- target_acknowledge_created_inferior (pid);
+ if (pid == -1)
+ /* Resume all threads. Traditionally ptrace() only supports
+ single-threaded processes, so simply resume the inferior. */
+ pid = ptid_get_pid (inferior_ptid);
- /* 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);
+ 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;
+ }
- /* 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));
+ /* 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 program counter 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"));
}
-/* 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);
-}
+/* Wait for the child specified by PTID to do something. Return the
+ process ID of the child, or MINUS_ONE_PTID in case of error; store
+ the status in *OURSTATUS. */
-static int
-inf_ptrace_reported_exec_events_per_exec_call (void)
+static ptid_t
+inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
{
- /* Typically, we get a single SIGTRAP per exec. */
- return 1;
-}
+ pid_t pid;
+ int status, save_errno;
-static int
-inf_ptrace_has_exited (int pid, int wait_status, int *exit_status)
-{
- if (WIFEXITED (wait_status))
+ do
{
- *exit_status = WEXITSTATUS (wait_status);
- return 1;
- }
+ set_sigint_trap ();
+ set_sigio_trap ();
- if (WIFSIGNALED (wait_status))
- {
- *exit_status = 0; /* ?? Don't know what else to say here. */
- return 1;
- }
+ do
+ {
+ pid = waitpid (ptid_get_pid (ptid), &status, 0);
+ save_errno = errno;
+ }
+ while (pid == -1 && errno == EINTR);
- /* ??? Do we really need to consult the event state, too?
- Assume the wait_state alone suffices. */
- return 0;
-}
+ clear_sigio_trap ();
+ clear_sigint_trap ();
-static void
-inf_ptrace_mourn_inferior (void)
-{
- unpush_target (ptrace_ops_hack);
- generic_mourn_inferior ();
-}
+ if (pid == -1)
+ {
+ fprintf_unfiltered (gdb_stderr,
+ _("Child process unexpectedly missing: %s.\n"),
+ safe_strerror (save_errno));
-static int
-inf_ptrace_can_run (void)
-{
- return 1;
-}
+ /* Claim it exited with unknown signal. */
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+ return minus_one_ptid;
+ }
-/* Send a SIGINT to the process group. This acts just like the user
- typed a ^C on the controlling terminal.
+ /* Ignore terminated detached child processes. */
+ if (!WIFSTOPPED (status) && pid != ptid_get_pid (inferior_ptid))
+ pid = -1;
+ }
+ while (pid == -1);
- FIXME: This may not be correct for all systems. Some may want to
- use killpg() instead of kill (-pgrp). */
+#ifdef PT_GET_PROCESS_STATE
+ if (WIFSTOPPED (status))
+ {
+ ptrace_state_t pe;
+ pid_t fpid;
-static void
-inf_ptrace_stop (void)
-{
- kill (-inferior_process_group, SIGINT);
+ if (ptrace (PT_GET_PROCESS_STATE, pid,
+ (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
+ perror_with_name (("ptrace"));
+
+ switch (pe.pe_report_event)
+ {
+ case PTRACE_FORK:
+ ourstatus->kind = TARGET_WAITKIND_FORKED;
+ ourstatus->value.related_pid = pe.pe_other_pid;
+
+ /* Make sure the other end of the fork is stopped too. */
+ fpid = waitpid (pe.pe_other_pid, &status, 0);
+ if (fpid == -1)
+ perror_with_name (("waitpid"));
+
+ if (ptrace (PT_GET_PROCESS_STATE, fpid,
+ (PTRACE_TYPE_ARG3)&pe, sizeof pe) == -1)
+ perror_with_name (("ptrace"));
+
+ gdb_assert (pe.pe_report_event == PTRACE_FORK);
+ gdb_assert (pe.pe_other_pid == pid);
+ if (fpid == ptid_get_pid (inferior_ptid))
+ {
+ ourstatus->value.related_pid = pe.pe_other_pid;
+ return pid_to_ptid (fpid);
+ }
+
+ return pid_to_ptid (pid);
+ }
+ }
+#endif
+
+ store_waitstatus (ourstatus, status);
+ return pid_to_ptid (pid);
}
-/* Perform a partial transfer to/from the specified object. For
- memory transfers, fall back to the old memory xfer functions. */
+/* Attempt a transfer all LEN bytes starting at OFFSET between the
+ inferior's OBJECT:ANNEX space and GDB's READBUF/WRITEBUF buffer.
+ Return the number of bytes actually transferred. */
static LONGEST
inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, void *readbuf,
- const void *writebuf, ULONGEST offset, LONGEST len)
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
{
+ pid_t pid = ptid_get_pid (inferior_ptid);
+
switch (object)
{
case TARGET_OBJECT_MEMORY:
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;
+ for instruction and data. However, on OpenBSD 3.9 and
+ later, PIOD_WRITE_D doesn't allow changing memory that's
+ mapped read-only. Since most code segments will be
+ read-only, using PIOD_WRITE_D will prevent us from
+ inserting breakpoints, so we use PIOD_WRITE_I instead. */
+ piod.piod_op = writebuf ? PIOD_WRITE_I : 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)
+ if (ptrace (PT_IO, pid, (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
union
{
PTRACE_TYPE_RET word;
- unsigned char byte[sizeof (PTRACE_TYPE_RET)];
+ gdb_byte 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).
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
|| (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);
-
+ buffer.word = ptrace (PT_READ_I, pid,
+ (PTRACE_TYPE_ARG3)(uintptr_t)
+ 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,
+ ptrace (PT_WRITE_D, pid,
+ (PTRACE_TYPE_ARG3)(uintptr_t)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,
+ ptrace (PT_WRITE_I, pid,
+ (PTRACE_TYPE_ARG3)(uintptr_t)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);
+ buffer.word = ptrace (PT_READ_I, pid,
+ (PTRACE_TYPE_ARG3)(uintptr_t)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;
}
}
}
-static char *
-inf_ptrace_pid_to_str (ptid_t ptid)
+/* Return non-zero if the thread specified by PTID is alive. */
+
+static int
+inf_ptrace_thread_alive (ptid_t ptid)
{
- return normal_pid_to_str (ptid);
+ /* ??? Is kill the right way to do this? */
+ return (kill (ptid_get_pid (ptid), 0) != -1);
+}
+
+/* Print status information about what we're accessing. */
+
+static void
+inf_ptrace_files_info (struct target_ops *ignore)
+{
+ printf_filtered (_("\tUsing the running image of %s %s.\n"),
+ attach_flag ? "attached" : "child",
+ target_pid_to_str (inferior_ptid));
}
/* Create a prototype ptrace target. The client can override it with
{
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_kill = inf_ptrace_kill;
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;
+#ifdef PT_GET_PROCESS_STATE
+ t->to_follow_fork = inf_ptrace_follow_fork;
+ t->to_post_startup_inferior = inf_ptrace_post_startup_inferior;
+ t->to_post_attach = inf_ptrace_post_attach;
+#endif
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_pid_to_str = normal_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;
+ t->to_xfer_partial = inf_ptrace_xfer_partial;
+ ptrace_ops_hack = t;
return t;
}
\f
-/* Pointer to a function that returns the oggset within the user area
+/* Pointer to a function that returns the offset within the user area
where a particular register is stored. */
-static CORE_ADDR (*inf_ptrace_register_u_offset)(int);
+static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int);
/* Fetch register REGNUM from the inferior. */
static void
-inf_ptrace_fetch_register (int regnum)
+inf_ptrace_fetch_register (struct regcache *regcache, int regnum)
{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
int pid, i;
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0);
+ if (addr == (CORE_ADDR)-1
+ || gdbarch_cannot_fetch_register (gdbarch, regnum))
+ {
+ regcache_raw_supply (regcache, regnum, NULL);
+ return;
+ }
+
/* Cater for systems like GNU/Linux, that implement threads as
- seperate processes. */
+ separate 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);
-
+ size = register_size (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. */
+ /* Read the register contents from the inferior a chunk at a 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);
+ buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0);
if (errno != 0)
- error (_("Couldn't read register %s (#%d): %s."), REGISTER_NAME (regnum),
+ error (_("Couldn't read register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
- regcache_raw_supply (current_regcache, regnum, buf);
+ regcache_raw_supply (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)
+inf_ptrace_fetch_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- inf_ptrace_fetch_register (regnum);
+ for (regnum = 0;
+ regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+ regnum++)
+ inf_ptrace_fetch_register (regcache, regnum);
else
- inf_ptrace_fetch_register (regnum);
+ inf_ptrace_fetch_register (regcache, regnum);
}
/* Store register REGNUM into the inferior. */
static void
-inf_ptrace_store_register (int regnum)
+inf_ptrace_store_register (const struct regcache *regcache, int regnum)
{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
int pid, i;
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1);
+ if (addr == (CORE_ADDR)-1
+ || gdbarch_cannot_store_register (gdbarch, regnum))
+ return;
+
/* Cater for systems like GNU/Linux, that implement threads as
- seperate processes. */
+ separate 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);
-
+ size = register_size (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);
+ /* Write the register contents into the inferior a chunk at a time. */
+ regcache_raw_collect (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]);
+ ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]);
if (errno != 0)
- error (_("Couldn't write register %s (#%d): %s."), REGISTER_NAME (regnum),
+ error (_("Couldn't write register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
this for all registers. */
void
-inf_ptrace_store_registers (int regnum)
+inf_ptrace_store_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- inf_ptrace_store_register (regnum);
+ for (regnum = 0;
+ regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+ regnum++)
+ inf_ptrace_store_register (regcache, regnum);
else
- inf_ptrace_store_register (regnum);
+ inf_ptrace_store_register (regcache, regnum);
}
/* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
particular register is stored. */
struct target_ops *
-inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(int))
+inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)
+ (struct gdbarch *, int, int))
{
struct target_ops *t = inf_ptrace_target();
projects / deliverable / binutils-gdb.git / blobdiff