/* GNU/Linux native-dependent code common to multiple platforms.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GDB.
#include "inf-loop.h"
#include "event-loop.h"
#include "event-top.h"
+#include <pwd.h>
+#include <sys/types.h>
+#include "gdb_dirent.h"
+#include "xml-support.h"
+#include "terminal.h"
+#include <sys/vfs.h>
+#include "solib.h"
+
+#ifndef SPUFS_MAGIC
+#define SPUFS_MAGIC 0x23c9b64e
+#endif
#ifdef HAVE_PERSONALITY
# include <sys/personality.h>
Waiting for events in async mode
================================
-In async mode, GDB should always be ready to handle both user input and target
-events, so neither blocking waitpid nor sigsuspend are viable
-options. Instead, we should notify the GDB main event loop whenever there's
-unprocessed event from the target. The only way to notify this event loop is
-to make it wait on input from a pipe, and write something to the pipe whenever
-there's event. Obviously, if we fail to notify the event loop if there's
-target event, it's bad. If we notify the event loop when there's no event
-from target, linux-nat.c will detect that there's no event, actually, and
-report event of type TARGET_WAITKIND_IGNORE, but it will waste time and
-better avoided.
-
-The main design point is that every time GDB is outside linux-nat.c, we have a
-SIGCHLD handler installed that is called when something happens to the target
-and notifies the GDB event loop. Also, the event is extracted from the target
-using waitpid and stored for future use. Whenever GDB core decides to handle
-the event, and calls into linux-nat.c, we disable SIGCHLD and process things
-as in sync mode, except that before waitpid call we check if there are any
-previously read events.
-
-It could happen that during event processing, we'll try to get more events
-than there are events in the local queue, which will result to waitpid call.
-Those waitpid calls, while blocking, are guarantied to always have
-something for waitpid to return. E.g., stopping a thread with SIGSTOP, and
-waiting for the lwp to stop.
-
-The event loop is notified about new events using a pipe. SIGCHLD handler does
-waitpid and writes the results in to a pipe. GDB event loop has the other end
-of the pipe among the sources. When event loop starts to process the event
-and calls a function in linux-nat.c, all events from the pipe are transferred
-into a local queue and SIGCHLD is blocked. Further processing goes as in sync
-mode. Before we return from linux_nat_wait, we transfer all unprocessed events
-from local queue back to the pipe, so that when we get back to event loop,
-event loop will notice there's something more to do.
-
-SIGCHLD is blocked when we're inside target_wait, so that should we actually
-want to wait for some more events, SIGCHLD handler does not steal them from
-us. Technically, it would be possible to add new events to the local queue but
-it's about the same amount of work as blocking SIGCHLD.
-
-This moving of events from pipe into local queue and back into pipe when we
-enter/leave linux-nat.c is somewhat ugly. Unfortunately, GDB event loop is
-home-grown and incapable to wait on any queue.
+In async mode, GDB should always be ready to handle both user input
+and target events, so neither blocking waitpid nor sigsuspend are
+viable options. Instead, we should asynchronously notify the GDB main
+event loop whenever there's an unprocessed event from the target. We
+detect asynchronous target events by handling SIGCHLD signals. To
+notify the event loop about target events, the self-pipe trick is used
+--- a pipe is registered as waitable event source in the event loop,
+the event loop select/poll's on the read end of this pipe (as well on
+other event sources, e.g., stdin), and the SIGCHLD handler writes a
+byte to this pipe. This is more portable than relying on
+pselect/ppoll, since on kernels that lack those syscalls, libc
+emulates them with select/poll+sigprocmask, and that is racy
+(a.k.a. plain broken).
+
+Obviously, if we fail to notify the event loop if there's a target
+event, it's bad. OTOH, if we notify the event loop when there's no
+event from the target, linux_nat_wait will detect that there's no real
+event to report, and return event of type TARGET_WAITKIND_IGNORE.
+This is mostly harmless, but it will waste time and is better avoided.
+
+The main design point is that every time GDB is outside linux-nat.c,
+we have a SIGCHLD handler installed that is called when something
+happens to the target and notifies the GDB event loop. Whenever GDB
+core decides to handle the event, and calls into linux-nat.c, we
+process things as in sync mode, except that the we never block in
+sigsuspend.
+
+While processing an event, we may end up momentarily blocked in
+waitpid calls. Those waitpid calls, while blocking, are guarantied to
+return quickly. E.g., in all-stop mode, before reporting to the core
+that an LWP hit a breakpoint, all LWPs are stopped by sending them
+SIGSTOP, and synchronously waiting for the SIGSTOP to be reported.
+Note that this is different from blocking indefinitely waiting for the
+next event --- here, we're already handling an event.
Use of signals
==============
#endif /* PTRACE_EVENT_FORK */
+/* Unlike other extended result codes, WSTOPSIG (status) on
+ PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
+ instead SIGTRAP with bit 7 set. */
+#define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
+
/* We can't always assume that this flag is available, but all systems
with the ptrace event handlers also have __WALL, so it's safe to use
here. */
#endif
#ifndef PTRACE_GETSIGINFO
-#define PTRACE_GETSIGINFO 0x4202
+# define PTRACE_GETSIGINFO 0x4202
+# define PTRACE_SETSIGINFO 0x4203
#endif
/* The single-threaded native GNU/Linux target_ops. We save a pointer for
/* The method to call, if any, when a new thread is attached. */
static void (*linux_nat_new_thread) (ptid_t);
+/* The method to call, if any, when the siginfo object needs to be
+ converted between the layout returned by ptrace, and the layout in
+ the architecture of the inferior. */
+static int (*linux_nat_siginfo_fixup) (struct siginfo *,
+ gdb_byte *,
+ int);
+
/* The saved to_xfer_partial method, inherited from inf-ptrace.c.
Called by our to_xfer_partial. */
static LONGEST (*super_xfer_partial) (struct target_ops *,
#endif /* !HAVE_PERSONALITY */
}
-static int linux_parent_pid;
-
struct simple_pid_list
{
int pid;
static int linux_supports_tracefork_flag = -1;
+/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACESYSGOOD
+ can not be used, 1 if it can. */
+
+static int linux_supports_tracesysgood_flag = -1;
+
/* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
PTRACE_O_TRACEVFORKDONE. */
linux_nat_wait should behave as if async mode was off. */
static int linux_nat_async_mask_value = 1;
+/* Stores the current used ptrace() options. */
+static int current_ptrace_options = 0;
+
/* The read/write ends of the pipe registered as waitable file in the
event loop. */
static int linux_nat_event_pipe[2] = { -1, -1 };
-/* Number of queued events in the pipe. */
-static volatile int linux_nat_num_queued_events;
-
-/* The possible SIGCHLD handling states. */
-
-enum sigchld_state
-{
- /* SIGCHLD disabled, with action set to sigchld_handler, for the
- sigsuspend in linux_nat_wait. */
- sigchld_sync,
- /* SIGCHLD enabled, with action set to async_sigchld_handler. */
- sigchld_async,
- /* Set SIGCHLD to default action. Used while creating an
- inferior. */
- sigchld_default
-};
-
-/* The current SIGCHLD handling state. */
-static enum sigchld_state linux_nat_async_events_state;
-
-static enum sigchld_state linux_nat_async_events (enum sigchld_state enable);
-static void pipe_to_local_event_queue (void);
-static void local_event_queue_to_pipe (void);
-static void linux_nat_event_pipe_push (int pid, int status, int options);
-static int linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options);
-static void linux_nat_set_async_mode (int on);
-static void linux_nat_async (void (*callback)
- (enum inferior_event_type event_type, void *context),
- void *context);
-static int linux_nat_async_mask (int mask);
-static int kill_lwp (int lwpid, int signo);
-
-static int stop_callback (struct lwp_info *lp, void *data);
-
-/* Captures the result of a successful waitpid call, along with the
- options used in that call. */
-struct waitpid_result
-{
- int pid;
- int status;
- int options;
- struct waitpid_result *next;
-};
-
-/* A singly-linked list of the results of the waitpid calls performed
- in the async SIGCHLD handler. */
-static struct waitpid_result *waitpid_queue = NULL;
-
-/* Similarly to `waitpid', but check the local event queue instead of
- querying the kernel queue. If PEEK, don't remove the event found
- from the queue. */
+/* Flush the event pipe. */
-static int
-queued_waitpid_1 (int pid, int *status, int flags, int peek)
+static void
+async_file_flush (void)
{
- struct waitpid_result *msg = waitpid_queue, *prev = NULL;
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog,
- "\
-QWPID: linux_nat_async_events_state(%d), linux_nat_num_queued_events(%d)\n",
- linux_nat_async_events_state,
- linux_nat_num_queued_events);
-
- if (flags & __WALL)
- {
- for (; msg; prev = msg, msg = msg->next)
- if (pid == -1 || pid == msg->pid)
- break;
- }
- else if (flags & __WCLONE)
- {
- for (; msg; prev = msg, msg = msg->next)
- if (msg->options & __WCLONE
- && (pid == -1 || pid == msg->pid))
- break;
- }
- else
- {
- for (; msg; prev = msg, msg = msg->next)
- if ((msg->options & __WCLONE) == 0
- && (pid == -1 || pid == msg->pid))
- break;
- }
+ int ret;
+ char buf;
- if (msg)
+ do
{
- int pid;
-
- if (status)
- *status = msg->status;
- pid = msg->pid;
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n",
- pid, msg->status);
-
- if (!peek)
- {
- if (prev)
- prev->next = msg->next;
- else
- waitpid_queue = msg->next;
-
- msg->next = NULL;
- xfree (msg);
- }
-
- return pid;
+ ret = read (linux_nat_event_pipe[0], &buf, 1);
}
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "QWPID: miss\n");
-
- if (status)
- *status = 0;
- return -1;
+ while (ret >= 0 || (ret == -1 && errno == EINTR));
}
-/* Similarly to `waitpid', but check the local event queue. */
-
-static int
-queued_waitpid (int pid, int *status, int flags)
-{
- return queued_waitpid_1 (pid, status, flags, 0);
-}
+/* Put something (anything, doesn't matter what, or how much) in event
+ pipe, so that the select/poll in the event-loop realizes we have
+ something to process. */
static void
-push_waitpid (int pid, int status, int options)
+async_file_mark (void)
{
- struct waitpid_result *event, *new_event;
+ int ret;
- new_event = xmalloc (sizeof (*new_event));
- new_event->pid = pid;
- new_event->status = status;
- new_event->options = options;
- new_event->next = NULL;
+ /* It doesn't really matter what the pipe contains, as long we end
+ up with something in it. Might as well flush the previous
+ left-overs. */
+ async_file_flush ();
- if (waitpid_queue)
+ do
{
- for (event = waitpid_queue;
- event && event->next;
- event = event->next)
- ;
-
- event->next = new_event;
+ ret = write (linux_nat_event_pipe[1], "+", 1);
}
- else
- waitpid_queue = new_event;
-}
+ while (ret == -1 && errno == EINTR);
-/* Drain all queued events of PID. If PID is -1, the effect is of
- draining all events. */
-static void
-drain_queued_events (int pid)
-{
- while (queued_waitpid (pid, NULL, __WALL) != -1)
- ;
+ /* Ignore EAGAIN. If the pipe is full, the event loop will already
+ be awakened anyway. */
}
+static void linux_nat_async (void (*callback)
+ (enum inferior_event_type event_type, void *context),
+ void *context);
+static int linux_nat_async_mask (int mask);
+static int kill_lwp (int lwpid, int signo);
+
+static int stop_callback (struct lwp_info *lp, void *data);
+
+static void block_child_signals (sigset_t *prev_mask);
+static void restore_child_signals_mask (sigset_t *prev_mask);
+
+struct lwp_info;
+static struct lwp_info *add_lwp (ptid_t ptid);
+static void purge_lwp_list (int pid);
+static struct lwp_info *find_lwp_pid (ptid_t ptid);
+
\f
/* Trivial list manipulation functions to keep track of a list of
new stopped processes. */
add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
{
struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
+
new_pid->pid = pid;
new_pid->status = status;
new_pid->next = *listp;
}
static int
-pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status)
+pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp)
{
struct simple_pid_list **p;
if ((*p)->pid == pid)
{
struct simple_pid_list *next = (*p)->next;
- *status = (*p)->status;
+
+ *statusp = (*p)->status;
xfree (*p);
*p = next;
return 1;
static void
linux_tracefork_child (void)
{
- int ret;
-
ptrace (PTRACE_TRACEME, 0, 0, 0);
kill (getpid (), SIGSTOP);
fork ();
_exit (0);
}
-/* Wrapper function for waitpid which handles EINTR, and checks for
- locally queued events. */
+/* Wrapper function for waitpid which handles EINTR. */
static int
-my_waitpid (int pid, int *status, int flags)
+my_waitpid (int pid, int *statusp, int flags)
{
int ret;
- /* There should be no concurrent calls to waitpid. */
- gdb_assert (linux_nat_async_events_state == sigchld_sync);
-
- ret = queued_waitpid (pid, status, flags);
- if (ret != -1)
- return ret;
-
do
{
- ret = waitpid (pid, status, flags);
+ ret = waitpid (pid, statusp, flags);
}
while (ret == -1 && errno == EINTR);
{
int child_pid, ret, status;
long second_pid;
- enum sigchld_state async_events_original_state;
+ sigset_t prev_mask;
- async_events_original_state = linux_nat_async_events (sigchld_sync);
+ /* We don't want those ptrace calls to be interrupted. */
+ block_child_signals (&prev_mask);
linux_supports_tracefork_flag = 0;
linux_supports_tracevforkdone_flag = 0;
ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
if (ret != 0)
- return;
+ {
+ restore_child_signals_mask (&prev_mask);
+ return;
+ }
child_pid = fork ();
if (child_pid == -1)
if (ret != 0)
{
warning (_("linux_test_for_tracefork: failed to kill child"));
- linux_nat_async_events (async_events_original_state);
+ restore_child_signals_mask (&prev_mask);
return;
}
warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
"killed child"), status);
- linux_nat_async_events (async_events_original_state);
+ restore_child_signals_mask (&prev_mask);
return;
}
warning (_("linux_test_for_tracefork: failed to kill child"));
my_waitpid (child_pid, &status, 0);
- linux_nat_async_events (async_events_original_state);
+ restore_child_signals_mask (&prev_mask);
+}
+
+/* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls.
+
+ We try to enable syscall tracing on ORIGINAL_PID. If this fails,
+ we know that the feature is not available. This may change the tracing
+ options for ORIGINAL_PID, but we'll be setting them shortly anyway. */
+
+static void
+linux_test_for_tracesysgood (int original_pid)
+{
+ int ret;
+ sigset_t prev_mask;
+
+ /* We don't want those ptrace calls to be interrupted. */
+ block_child_signals (&prev_mask);
+
+ linux_supports_tracesysgood_flag = 0;
+
+ ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD);
+ if (ret != 0)
+ goto out;
+
+ linux_supports_tracesysgood_flag = 1;
+out:
+ restore_child_signals_mask (&prev_mask);
+}
+
+/* Determine wether we support PTRACE_O_TRACESYSGOOD option available.
+ This function also sets linux_supports_tracesysgood_flag. */
+
+static int
+linux_supports_tracesysgood (int pid)
+{
+ if (linux_supports_tracesysgood_flag == -1)
+ linux_test_for_tracesysgood (pid);
+ return linux_supports_tracesysgood_flag;
}
/* Return non-zero iff we have tracefork functionality available.
return linux_supports_tracevforkdone_flag;
}
+static void
+linux_enable_tracesysgood (ptid_t ptid)
+{
+ int pid = ptid_get_lwp (ptid);
+
+ if (pid == 0)
+ pid = ptid_get_pid (ptid);
+
+ if (linux_supports_tracesysgood (pid) == 0)
+ return;
+
+ current_ptrace_options |= PTRACE_O_TRACESYSGOOD;
+
+ ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options);
+}
+
\f
void
linux_enable_event_reporting (ptid_t ptid)
{
int pid = ptid_get_lwp (ptid);
- int options;
if (pid == 0)
pid = ptid_get_pid (ptid);
if (! linux_supports_tracefork (pid))
return;
- options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
- | PTRACE_O_TRACECLONE;
+ current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK
+ | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE;
+
if (linux_supports_tracevforkdone (pid))
- options |= PTRACE_O_TRACEVFORKDONE;
+ current_ptrace_options |= PTRACE_O_TRACEVFORKDONE;
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
read-only process state. */
- ptrace (PTRACE_SETOPTIONS, pid, 0, options);
+ ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options);
}
static void
{
linux_enable_event_reporting (pid_to_ptid (pid));
check_for_thread_db ();
+ linux_enable_tracesysgood (pid_to_ptid (pid));
}
static void
{
linux_enable_event_reporting (ptid);
check_for_thread_db ();
+ linux_enable_tracesysgood (ptid);
}
static int
linux_child_follow_fork (struct target_ops *ops, int follow_child)
{
- ptid_t last_ptid;
- struct target_waitstatus last_status;
+ sigset_t prev_mask;
int has_vforked;
int parent_pid, child_pid;
- if (target_can_async_p ())
- target_async (NULL, 0);
+ block_child_signals (&prev_mask);
- get_last_target_status (&last_ptid, &last_status);
- has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED);
- parent_pid = ptid_get_lwp (last_ptid);
+ has_vforked = (inferior_thread ()->pending_follow.kind
+ == TARGET_WAITKIND_VFORKED);
+ parent_pid = ptid_get_lwp (inferior_ptid);
if (parent_pid == 0)
- parent_pid = ptid_get_pid (last_ptid);
- child_pid = PIDGET (last_status.value.related_pid);
+ parent_pid = ptid_get_pid (inferior_ptid);
+ child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid);
+
+ if (!detach_fork)
+ linux_enable_event_reporting (pid_to_ptid (child_pid));
+
+ if (has_vforked
+ && !non_stop /* Non-stop always resumes both branches. */
+ && (!target_is_async_p () || sync_execution)
+ && !(follow_child || detach_fork || sched_multi))
+ {
+ /* The parent stays blocked inside the vfork syscall until the
+ child execs or exits. If we don't let the child run, then
+ the parent stays blocked. If we're telling the parent to run
+ in the foreground, the user will not be able to ctrl-c to get
+ back the terminal, effectively hanging the debug session. */
+ fprintf_filtered (gdb_stderr, _("\
+Can not resume the parent process over vfork in the foreground while\n\
+holding the child stopped. Try \"set detach-on-fork\" or \
+\"set schedule-multiple\".\n"));
+ return 1;
+ }
if (! follow_child)
{
- /* We're already attached to the parent, by default. */
+ struct lwp_info *child_lp = NULL;
- /* Before detaching from the child, remove all breakpoints from
- it. (This won't actually modify the breakpoint list, but will
- physically remove the breakpoints from the child.) */
- /* If we vforked this will remove the breakpoints from the parent
- also, but they'll be reinserted below. */
- detach_breakpoints (child_pid);
+ /* We're already attached to the parent, by default. */
/* Detach new forked process? */
if (detach_fork)
{
+ /* Before detaching from the child, remove all breakpoints
+ from it. If we forked, then this has already been taken
+ care of by infrun.c. If we vforked however, any
+ breakpoint inserted in the parent is visible in the
+ child, even those added while stopped in a vfork
+ catchpoint. This will remove the breakpoints from the
+ parent also, but they'll be reinserted below. */
+ if (has_vforked)
+ {
+ /* keep breakpoints list in sync. */
+ remove_breakpoints_pid (GET_PID (inferior_ptid));
+ }
+
if (info_verbose || debug_linux_nat)
{
target_terminal_ours ();
}
else
{
- struct fork_info *fp;
+ struct inferior *parent_inf, *child_inf;
+ struct cleanup *old_chain;
/* Add process to GDB's tables. */
- add_inferior (child_pid);
+ child_inf = add_inferior (child_pid);
- /* Retain child fork in ptrace (stopped) state. */
- fp = find_fork_pid (child_pid);
- if (!fp)
- fp = add_fork (child_pid);
- fork_save_infrun_state (fp, 0);
+ parent_inf = current_inferior ();
+ child_inf->attach_flag = parent_inf->attach_flag;
+ copy_terminal_info (child_inf, parent_inf);
+
+ old_chain = save_inferior_ptid ();
+ save_current_program_space ();
+
+ inferior_ptid = ptid_build (child_pid, child_pid, 0);
+ add_thread (inferior_ptid);
+ child_lp = add_lwp (inferior_ptid);
+ child_lp->stopped = 1;
+ child_lp->resumed = 1;
+
+ /* If this is a vfork child, then the address-space is
+ shared with the parent. */
+ if (has_vforked)
+ {
+ child_inf->pspace = parent_inf->pspace;
+ child_inf->aspace = parent_inf->aspace;
+
+ /* The parent will be frozen until the child is done
+ with the shared region. Keep track of the
+ parent. */
+ child_inf->vfork_parent = parent_inf;
+ child_inf->pending_detach = 0;
+ parent_inf->vfork_child = child_inf;
+ parent_inf->pending_detach = 0;
+ }
+ else
+ {
+ child_inf->aspace = new_address_space ();
+ child_inf->pspace = add_program_space (child_inf->aspace);
+ child_inf->removable = 1;
+ set_current_program_space (child_inf->pspace);
+ clone_program_space (child_inf->pspace, parent_inf->pspace);
+
+ /* Let the shared library layer (solib-svr4) learn about
+ this new process, relocate the cloned exec, pull in
+ shared libraries, and install the solib event
+ breakpoint. If a "cloned-VM" event was propagated
+ better throughout the core, this wouldn't be
+ required. */
+ solib_create_inferior_hook (0);
+ }
+
+ /* Let the thread_db layer learn about this new process. */
+ check_for_thread_db ();
+
+ do_cleanups (old_chain);
}
if (has_vforked)
{
+ struct lwp_info *lp;
+ struct inferior *parent_inf;
+
+ parent_inf = current_inferior ();
+
+ /* If we detached from the child, then we have to be careful
+ to not insert breakpoints in the parent until the child
+ is done with the shared memory region. However, if we're
+ staying attached to the child, then we can and should
+ insert breakpoints, so that we can debug it. A
+ subsequent child exec or exit is enough to know when does
+ the child stops using the parent's address space. */
+ parent_inf->waiting_for_vfork_done = detach_fork;
+ parent_inf->pspace->breakpoints_not_allowed = detach_fork;
+
+ lp = find_lwp_pid (pid_to_ptid (parent_pid));
gdb_assert (linux_supports_tracefork_flag >= 0);
if (linux_supports_tracevforkdone (0))
{
- int status;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LCFF: waiting for VFORK_DONE on %d\n",
+ parent_pid);
- ptrace (PTRACE_CONT, parent_pid, 0, 0);
- my_waitpid (parent_pid, &status, __WALL);
- if ((status >> 16) != PTRACE_EVENT_VFORK_DONE)
- warning (_("Unexpected waitpid result %06x when waiting for "
- "vfork-done"), status);
+ lp->stopped = 1;
+ lp->resumed = 1;
+
+ /* We'll handle the VFORK_DONE event like any other
+ event, in target_wait. */
}
else
{
is only the single-step breakpoint at vfork's return
point. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LCFF: no VFORK_DONE support, sleeping a bit\n");
+
usleep (10000);
- }
- /* Since we vforked, breakpoints were removed in the parent
- too. Put them back. */
- reattach_breakpoints (parent_pid);
+ /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event,
+ and leave it pending. The next linux_nat_resume call
+ will notice a pending event, and bypasses actually
+ resuming the inferior. */
+ lp->status = 0;
+ lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE;
+ lp->stopped = 0;
+ lp->resumed = 1;
+
+ /* If we're in async mode, need to tell the event loop
+ there's something here to process. */
+ if (target_can_async_p ())
+ async_file_mark ();
+ }
}
}
else
{
- struct thread_info *last_tp = find_thread_pid (last_ptid);
- struct thread_info *tp;
- char child_pid_spelling[40];
-
- /* Copy user stepping state to the new inferior thread. */
- struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint;
- CORE_ADDR step_range_start = last_tp->step_range_start;
- CORE_ADDR step_range_end = last_tp->step_range_end;
- struct frame_id step_frame_id = last_tp->step_frame_id;
-
- /* Otherwise, deleting the parent would get rid of this
- breakpoint. */
- last_tp->step_resume_breakpoint = NULL;
-
- /* Needed to keep the breakpoint lists in sync. */
- if (! has_vforked)
- detach_breakpoints (child_pid);
-
- /* Before detaching from the parent, remove all breakpoints from it. */
- remove_breakpoints ();
+ struct inferior *parent_inf, *child_inf;
+ struct lwp_info *lp;
+ struct program_space *parent_pspace;
if (info_verbose || debug_linux_nat)
{
target_terminal_ours ();
- fprintf_filtered (gdb_stdlog,
- "Attaching after fork to child process %d.\n",
- child_pid);
+ if (has_vforked)
+ fprintf_filtered (gdb_stdlog, _("\
+Attaching after process %d vfork to child process %d.\n"),
+ parent_pid, child_pid);
+ else
+ fprintf_filtered (gdb_stdlog, _("\
+Attaching after process %d fork to child process %d.\n"),
+ parent_pid, child_pid);
}
- /* If we're vforking, we may want to hold on to the parent until
- the child exits or execs. At exec time we can remove the old
- breakpoints from the parent and detach it; at exit time we
- could do the same (or even, sneakily, resume debugging it - the
- child's exec has failed, or something similar).
+ /* Add the new inferior first, so that the target_detach below
+ doesn't unpush the target. */
- This doesn't clean up "properly", because we can't call
- target_detach, but that's OK; if the current target is "child",
- then it doesn't need any further cleanups, and lin_lwp will
- generally not encounter vfork (vfork is defined to fork
- in libpthread.so).
+ child_inf = add_inferior (child_pid);
- The holding part is very easy if we have VFORKDONE events;
- but keeping track of both processes is beyond GDB at the
- moment. So we don't expose the parent to the rest of GDB.
- Instead we quietly hold onto it until such time as we can
- safely resume it. */
+ parent_inf = current_inferior ();
+ child_inf->attach_flag = parent_inf->attach_flag;
+ copy_terminal_info (child_inf, parent_inf);
+
+ parent_pspace = parent_inf->pspace;
+
+ /* If we're vforking, we want to hold on to the parent until the
+ child exits or execs. At child exec or exit time we can
+ remove the old breakpoints from the parent and detach or
+ resume debugging it. Otherwise, detach the parent now; we'll
+ want to reuse it's program/address spaces, but we can't set
+ them to the child before removing breakpoints from the
+ parent, otherwise, the breakpoints module could decide to
+ remove breakpoints from the wrong process (since they'd be
+ assigned to the same address space). */
if (has_vforked)
{
- linux_parent_pid = parent_pid;
- detach_inferior (parent_pid);
- }
- else if (!detach_fork)
- {
- struct fork_info *fp;
- /* Retain parent fork in ptrace (stopped) state. */
- fp = find_fork_pid (parent_pid);
- if (!fp)
- fp = add_fork (parent_pid);
- fork_save_infrun_state (fp, 0);
+ gdb_assert (child_inf->vfork_parent == NULL);
+ gdb_assert (parent_inf->vfork_child == NULL);
+ child_inf->vfork_parent = parent_inf;
+ child_inf->pending_detach = 0;
+ parent_inf->vfork_child = child_inf;
+ parent_inf->pending_detach = detach_fork;
+ parent_inf->waiting_for_vfork_done = 0;
}
- else
+ else if (detach_fork)
target_detach (NULL, 0);
- inferior_ptid = ptid_build (child_pid, child_pid, 0);
- add_inferior (child_pid);
+ /* Note that the detach above makes PARENT_INF dangling. */
- /* Reinstall ourselves, since we might have been removed in
- target_detach (which does other necessary cleanup). */
+ /* Add the child thread to the appropriate lists, and switch to
+ this new thread, before cloning the program space, and
+ informing the solib layer about this new process. */
- push_target (ops);
- linux_nat_switch_fork (inferior_ptid);
- check_for_thread_db ();
+ inferior_ptid = ptid_build (child_pid, child_pid, 0);
+ add_thread (inferior_ptid);
+ lp = add_lwp (inferior_ptid);
+ lp->stopped = 1;
+ lp->resumed = 1;
- tp = inferior_thread ();
- tp->step_resume_breakpoint = step_resume_breakpoint;
- tp->step_range_start = step_range_start;
- tp->step_range_end = step_range_end;
- tp->step_frame_id = step_frame_id;
+ /* If this is a vfork child, then the address-space is shared
+ with the parent. If we detached from the parent, then we can
+ reuse the parent's program/address spaces. */
+ if (has_vforked || detach_fork)
+ {
+ child_inf->pspace = parent_pspace;
+ child_inf->aspace = child_inf->pspace->aspace;
+ }
+ else
+ {
+ child_inf->aspace = new_address_space ();
+ child_inf->pspace = add_program_space (child_inf->aspace);
+ child_inf->removable = 1;
+ set_current_program_space (child_inf->pspace);
+ clone_program_space (child_inf->pspace, parent_pspace);
+
+ /* Let the shared library layer (solib-svr4) learn about
+ this new process, relocate the cloned exec, pull in
+ shared libraries, and install the solib event breakpoint.
+ If a "cloned-VM" event was propagated better throughout
+ the core, this wouldn't be required. */
+ solib_create_inferior_hook (0);
+ }
- /* Reset breakpoints in the child as appropriate. */
- follow_inferior_reset_breakpoints ();
+ /* Let the thread_db layer learn about this new process. */
+ check_for_thread_db ();
}
- if (target_can_async_p ())
- target_async (inferior_event_handler, 0);
-
+ restore_child_signals_mask (&prev_mask);
return 0;
}
error (_("Your system does not support exec catchpoints."));
}
+static int
+linux_child_set_syscall_catchpoint (int pid, int needed, int any_count,
+ int table_size, int *table)
+{
+ if (! linux_supports_tracesysgood (pid))
+ error (_("Your system does not support syscall catchpoints."));
+ /* On GNU/Linux, we ignore the arguments. It means that we only
+ enable the syscall catchpoints, but do not disable them.
+
+ Also, we do not use the `table' information because we do not
+ filter system calls here. We let GDB do the logic for us. */
+ return 0;
+}
+
/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
are processes sharing the same VM space. A multi-threaded process
is basically a group of such processes. However, such a grouping
/* List of known LWPs. */
struct lwp_info *lwp_list;
-
-/* Number of LWPs in the list. */
-static int num_lwps;
\f
/* Original signal mask. */
_initialize_linux_nat. */
static sigset_t suspend_mask;
-/* SIGCHLD action for synchronous mode. */
-struct sigaction sync_sigchld_action;
+/* Signals to block to make that sigsuspend work. */
+static sigset_t blocked_mask;
+
+/* SIGCHLD action. */
+struct sigaction sigchld_action;
+
+/* Block child signals (SIGCHLD and linux threads signals), and store
+ the previous mask in PREV_MASK. */
+
+static void
+block_child_signals (sigset_t *prev_mask)
+{
+ /* Make sure SIGCHLD is blocked. */
+ if (!sigismember (&blocked_mask, SIGCHLD))
+ sigaddset (&blocked_mask, SIGCHLD);
+
+ sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask);
+}
-/* SIGCHLD action for asynchronous mode. */
-static struct sigaction async_sigchld_action;
+/* Restore child signals mask, previously returned by
+ block_child_signals. */
-/* SIGCHLD default action, to pass to new inferiors. */
-static struct sigaction sigchld_default_action;
+static void
+restore_child_signals_mask (sigset_t *prev_mask)
+{
+ sigprocmask (SIG_SETMASK, prev_mask, NULL);
+}
\f
/* Prototypes for local functions. */
static int stop_wait_callback (struct lwp_info *lp, void *data);
-static int linux_nat_thread_alive (ptid_t ptid);
+static int linux_thread_alive (ptid_t ptid);
static char *linux_child_pid_to_exec_file (int pid);
-static int cancel_breakpoint (struct lwp_info *lp);
\f
/* Convert wait status STATUS to a string. Used for printing debug
static char buf[64];
if (WIFSTOPPED (status))
- snprintf (buf, sizeof (buf), "%s (stopped)",
- strsignal (WSTOPSIG (status)));
+ {
+ if (WSTOPSIG (status) == SYSCALL_SIGTRAP)
+ snprintf (buf, sizeof (buf), "%s (stopped at syscall)",
+ strsignal (SIGTRAP));
+ else
+ snprintf (buf, sizeof (buf), "%s (stopped)",
+ strsignal (WSTOPSIG (status)));
+ }
else if (WIFSIGNALED (status))
snprintf (buf, sizeof (buf), "%s (terminated)",
- strsignal (WSTOPSIG (status)));
+ strsignal (WTERMSIG (status)));
else
snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
return buf;
}
-/* Initialize the list of LWPs. Note that this module, contrary to
- what GDB's generic threads layer does for its thread list,
- re-initializes the LWP lists whenever we mourn or detach (which
- doesn't involve mourning) the inferior. */
+/* Remove all LWPs belong to PID from the lwp list. */
static void
-init_lwp_list (void)
+purge_lwp_list (int pid)
{
- struct lwp_info *lp, *lpnext;
+ struct lwp_info *lp, *lpprev, *lpnext;
+
+ lpprev = NULL;
for (lp = lwp_list; lp; lp = lpnext)
{
lpnext = lp->next;
- xfree (lp);
+
+ if (ptid_get_pid (lp->ptid) == pid)
+ {
+ if (lp == lwp_list)
+ lwp_list = lp->next;
+ else
+ lpprev->next = lp->next;
+
+ xfree (lp);
+ }
+ else
+ lpprev = lp;
}
+}
+
+/* Return the number of known LWPs in the tgid given by PID. */
+
+static int
+num_lwps (int pid)
+{
+ int count = 0;
+ struct lwp_info *lp;
- lwp_list = NULL;
- num_lwps = 0;
+ for (lp = lwp_list; lp; lp = lp->next)
+ if (ptid_get_pid (lp->ptid) == pid)
+ count++;
+
+ return count;
}
/* Add the LWP specified by PID to the list. Return a pointer to the
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
lp->ptid = ptid;
+ lp->core = -1;
lp->next = lwp_list;
lwp_list = lp;
- ++num_lwps;
- if (num_lwps > 1 && linux_nat_new_thread != NULL)
+ if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL)
linux_nat_new_thread (ptid);
return lp;
if (!lp)
return;
- num_lwps--;
-
if (lpprev)
lpprev->next = lp->next;
else
Otherwise return NULL. */
struct lwp_info *
-iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
+iterate_over_lwps (ptid_t filter,
+ int (*callback) (struct lwp_info *, void *),
+ void *data)
{
struct lwp_info *lp, *lpnext;
for (lp = lwp_list; lp; lp = lpnext)
{
lpnext = lp->next;
- if ((*callback) (lp, data))
- return lp;
+
+ if (ptid_match (lp->ptid, filter))
+ {
+ if ((*callback) (lp, data))
+ return lp;
+ }
}
return NULL;
}
-/* Update our internal state when changing from one fork (checkpoint,
- et cetera) to another indicated by NEW_PTID. We can only switch
- single-threaded applications, so we only create one new LWP, and
- the previous list is discarded. */
+/* Update our internal state when changing from one checkpoint to
+ another indicated by NEW_PTID. We can only switch single-threaded
+ applications, so we only create one new LWP, and the previous list
+ is discarded. */
void
linux_nat_switch_fork (ptid_t new_ptid)
{
struct lwp_info *lp;
- init_lwp_list ();
+ purge_lwp_list (GET_PID (inferior_ptid));
+
lp = add_lwp (new_ptid);
lp->stopped = 1;
- init_thread_list ();
- add_thread_silent (new_ptid);
+ /* This changes the thread's ptid while preserving the gdb thread
+ num. Also changes the inferior pid, while preserving the
+ inferior num. */
+ thread_change_ptid (inferior_ptid, new_ptid);
+
+ /* We've just told GDB core that the thread changed target id, but,
+ in fact, it really is a different thread, with different register
+ contents. */
+ registers_changed ();
}
/* Handle the exit of a single thread LP. */
static void
exit_lwp (struct lwp_info *lp)
{
- struct thread_info *th = find_thread_pid (lp->ptid);
+ struct thread_info *th = find_thread_ptid (lp->ptid);
if (th)
{
delete_lwp (lp->ptid);
}
+/* Return an lwp's tgid, found in `/proc/PID/status'. */
+
+int
+linux_proc_get_tgid (int lwpid)
+{
+ FILE *status_file;
+ char buf[100];
+ int tgid = -1;
+
+ snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
+ status_file = fopen (buf, "r");
+ if (status_file != NULL)
+ {
+ while (fgets (buf, sizeof (buf), status_file))
+ {
+ if (strncmp (buf, "Tgid:", 5) == 0)
+ {
+ tgid = strtoul (buf + strlen ("Tgid:"), NULL, 10);
+ break;
+ }
+ }
+
+ fclose (status_file);
+ }
+
+ return tgid;
+}
+
/* Detect `T (stopped)' in `/proc/PID/status'.
Other states including `T (tracing stop)' are reported as false. */
*cloned = 1;
}
- gdb_assert (pid == new_pid && WIFSTOPPED (status));
+ gdb_assert (pid == new_pid);
+
+ if (!WIFSTOPPED (status))
+ {
+ /* The pid we tried to attach has apparently just exited. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s",
+ pid, status_to_str (status));
+ return status;
+ }
if (WSTOPSIG (status) != SIGSTOP)
{
lin_lwp_attach_lwp (ptid_t ptid)
{
struct lwp_info *lp;
- enum sigchld_state async_events_original_state;
+ sigset_t prev_mask;
gdb_assert (is_lwp (ptid));
- async_events_original_state = linux_nat_async_events (sigchld_sync);
+ block_child_signals (&prev_mask);
lp = find_lwp_pid (ptid);
to create them. */
warning (_("Can't attach %s: %s"), target_pid_to_str (ptid),
safe_strerror (errno));
+ restore_child_signals_mask (&prev_mask);
return -1;
}
target_pid_to_str (ptid));
status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled);
+ if (!WIFSTOPPED (status))
+ return -1;
+
lp = add_lwp (ptid);
lp->stopped = 1;
lp->cloned = cloned;
lp->stopped = 1;
}
- linux_nat_async_events (async_events_original_state);
+ restore_child_signals_mask (&prev_mask);
return 0;
}
static void
-linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
+linux_nat_create_inferior (struct target_ops *ops,
+ char *exec_file, char *allargs, char **env,
int from_tty)
{
- int saved_async = 0;
#ifdef HAVE_PERSONALITY
int personality_orig = 0, personality_set = 0;
#endif /* HAVE_PERSONALITY */
/* The fork_child mechanism is synchronous and calls target_wait, so
we have to mask the async mode. */
- if (target_can_async_p ())
- /* Mask async mode. Creating a child requires a loop calling
- wait_for_inferior currently. */
- saved_async = linux_nat_async_mask (0);
- else
- {
- /* Restore the original signal mask. */
- sigprocmask (SIG_SETMASK, &normal_mask, NULL);
- /* Make sure we don't block SIGCHLD during a sigsuspend. */
- suspend_mask = normal_mask;
- sigdelset (&suspend_mask, SIGCHLD);
- }
-
- /* Set SIGCHLD to the default action, until after execing the child,
- since the inferior inherits the superior's signal mask. It will
- be blocked again in linux_nat_wait, which is only reached after
- the inferior execing. */
- linux_nat_async_events (sigchld_default);
-
#ifdef HAVE_PERSONALITY
if (disable_randomization)
{
}
#endif /* HAVE_PERSONALITY */
- linux_ops->to_create_inferior (exec_file, allargs, env, from_tty);
+ linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty);
#ifdef HAVE_PERSONALITY
if (personality_set)
safe_strerror (errno));
}
#endif /* HAVE_PERSONALITY */
-
- if (saved_async)
- linux_nat_async_mask (saved_async);
}
static void
-linux_nat_attach (char *args, int from_tty)
+linux_nat_attach (struct target_ops *ops, char *args, int from_tty)
{
struct lwp_info *lp;
int status;
ptid_t ptid;
- /* FIXME: We should probably accept a list of process id's, and
- attach all of them. */
- linux_ops->to_attach (args, from_tty);
-
- if (!target_can_async_p ())
- {
- /* Restore the original signal mask. */
- sigprocmask (SIG_SETMASK, &normal_mask, NULL);
- /* Make sure we don't block SIGCHLD during a sigsuspend. */
- suspend_mask = normal_mask;
- sigdelset (&suspend_mask, SIGCHLD);
- }
+ linux_ops->to_attach (ops, args, from_tty);
/* The ptrace base target adds the main thread with (pid,0,0)
format. Decorate it with lwp info. */
status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned,
&lp->signalled);
+ if (!WIFSTOPPED (status))
+ {
+ if (WIFEXITED (status))
+ {
+ int exit_code = WEXITSTATUS (status);
+
+ target_terminal_ours ();
+ target_mourn_inferior ();
+ if (exit_code == 0)
+ error (_("Unable to attach: program exited normally."));
+ else
+ error (_("Unable to attach: program exited with code %d."),
+ exit_code);
+ }
+ else if (WIFSIGNALED (status))
+ {
+ enum target_signal signo;
+
+ target_terminal_ours ();
+ target_mourn_inferior ();
+
+ signo = target_signal_from_host (WTERMSIG (status));
+ error (_("Unable to attach: program terminated with signal "
+ "%s, %s."),
+ target_signal_to_name (signo),
+ target_signal_to_string (signo));
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("unexpected status %d for PID %ld"),
+ status, (long) GET_LWP (ptid));
+ }
+
lp->stopped = 1;
/* Save the wait status to report later. */
"LNA: waitpid %ld, saving status %s\n",
(long) GET_PID (lp->ptid), status_to_str (status));
- if (!target_can_async_p ())
- lp->status = status;
- else
- {
- /* We already waited for this LWP, so put the wait result on the
- pipe. The event loop will wake up and gets us to handling
- this event. */
- linux_nat_event_pipe_push (GET_PID (lp->ptid), status,
- lp->cloned ? __WCLONE : 0);
- /* Register in the event loop. */
- target_async (inferior_event_handler, 0);
- }
+ lp->status = status;
+
+ if (target_can_async_p ())
+ target_async (inferior_event_handler, 0);
}
/* Get pending status of LP. */
static int
get_pending_status (struct lwp_info *lp, int *status)
{
- struct target_waitstatus last;
- ptid_t last_ptid;
+ enum target_signal signo = TARGET_SIGNAL_0;
+
+ /* If we paused threads momentarily, we may have stored pending
+ events in lp->status or lp->waitstatus (see stop_wait_callback),
+ and GDB core hasn't seen any signal for those threads.
+ Otherwise, the last signal reported to the core is found in the
+ thread object's stop_signal.
+
+ There's a corner case that isn't handled here at present. Only
+ if the thread stopped with a TARGET_WAITKIND_STOPPED does
+ stop_signal make sense as a real signal to pass to the inferior.
+ Some catchpoint related events, like
+ TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set
+ to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But,
+ those traps are debug API (ptrace in our case) related and
+ induced; the inferior wouldn't see them if it wasn't being
+ traced. Hence, we should never pass them to the inferior, even
+ when set to pass state. Since this corner case isn't handled by
+ infrun.c when proceeding with a signal, for consistency, neither
+ do we handle it here (or elsewhere in the file we check for
+ signal pass state). Normally SIGTRAP isn't set to pass state, so
+ this is really a corner case. */
- get_last_target_status (&last_ptid, &last);
-
- /* If this lwp is the ptid that GDB is processing an event from, the
- signal will be in stop_signal. Otherwise, in all-stop + sync
- mode, we may cache pending events in lp->status while trying to
- stop all threads (see stop_wait_callback). In async mode, the
- events are always cached in waitpid_queue. */
-
- *status = 0;
+ if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
+ signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */
+ else if (lp->status)
+ signo = target_signal_from_host (WSTOPSIG (lp->status));
+ else if (non_stop && !is_executing (lp->ptid))
+ {
+ struct thread_info *tp = find_thread_ptid (lp->ptid);
- if (non_stop)
+ signo = tp->stop_signal;
+ }
+ else if (!non_stop)
{
- enum target_signal signo = TARGET_SIGNAL_0;
+ struct target_waitstatus last;
+ ptid_t last_ptid;
- if (is_executing (lp->ptid))
- {
- /* If the core thought this lwp was executing --- e.g., the
- executing property hasn't been updated yet, but the
- thread has been stopped with a stop_callback /
- stop_wait_callback sequence (see linux_nat_detach for
- example) --- we can only have pending events in the local
- queue. */
- if (queued_waitpid (GET_LWP (lp->ptid), status, __WALL) != -1)
- {
- if (WIFSTOPPED (*status))
- signo = target_signal_from_host (WSTOPSIG (*status));
+ get_last_target_status (&last_ptid, &last);
- /* If not stopped, then the lwp is gone, no use in
- resending a signal. */
- }
- }
- else
+ if (GET_LWP (lp->ptid) == GET_LWP (last_ptid))
{
- /* If the core knows the thread is not executing, then we
- have the last signal recorded in
- thread_info->stop_signal. */
+ struct thread_info *tp = find_thread_ptid (lp->ptid);
- struct thread_info *tp = find_thread_pid (lp->ptid);
signo = tp->stop_signal;
}
+ }
- if (signo != TARGET_SIGNAL_0
- && !signal_pass_state (signo))
- {
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog, "\
-GPT: lwp %s had signal %s, but it is in no pass state\n",
- target_pid_to_str (lp->ptid),
- target_signal_to_string (signo));
- }
- else
- {
- if (signo != TARGET_SIGNAL_0)
- *status = W_STOPCODE (target_signal_to_host (signo));
+ *status = 0;
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "GPT: lwp %s as pending signal %s\n",
- target_pid_to_str (lp->ptid),
- target_signal_to_string (signo));
- }
+ if (signo == TARGET_SIGNAL_0)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "GPT: lwp %s has no pending signal\n",
+ target_pid_to_str (lp->ptid));
+ }
+ else if (!signal_pass_state (signo))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "\
+GPT: lwp %s had signal %s, but it is in no pass state\n",
+ target_pid_to_str (lp->ptid),
+ target_signal_to_string (signo));
}
else
{
- if (GET_LWP (lp->ptid) == GET_LWP (last_ptid))
- {
- struct thread_info *tp = find_thread_pid (lp->ptid);
- if (tp->stop_signal != TARGET_SIGNAL_0
- && signal_pass_state (tp->stop_signal))
- *status = W_STOPCODE (target_signal_to_host (tp->stop_signal));
- }
- else if (target_can_async_p ())
- queued_waitpid (GET_LWP (lp->ptid), status, __WALL);
- else
- *status = lp->status;
+ *status = W_STOPCODE (target_signal_to_host (signo));
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "GPT: lwp %s has pending signal %s\n",
+ target_pid_to_str (lp->ptid),
+ target_signal_to_string (signo));
}
return 0;
fprintf_unfiltered (gdb_stdlog,
"PTRACE_DETACH (%s, %s, 0) (OK)\n",
target_pid_to_str (lp->ptid),
- strsignal (WSTOPSIG (lp->status)));
+ strsignal (WSTOPSIG (status)));
delete_lwp (lp->ptid);
}
}
static void
-linux_nat_detach (char *args, int from_tty)
+linux_nat_detach (struct target_ops *ops, char *args, int from_tty)
{
int pid;
int status;
- enum target_signal sig;
+ struct lwp_info *main_lwp;
+
+ pid = GET_PID (inferior_ptid);
if (target_can_async_p ())
linux_nat_async (NULL, 0);
/* Stop all threads before detaching. ptrace requires that the
thread is stopped to sucessfully detach. */
- iterate_over_lwps (stop_callback, NULL);
+ iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL);
/* ... and wait until all of them have reported back that
they're no longer running. */
- iterate_over_lwps (stop_wait_callback, NULL);
+ iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL);
- iterate_over_lwps (detach_callback, NULL);
+ iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL);
/* Only the initial process should be left right now. */
- gdb_assert (num_lwps == 1);
+ gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1);
+
+ main_lwp = find_lwp_pid (pid_to_ptid (pid));
/* Pass on any pending signal for the last LWP. */
if ((args == NULL || *args == '\0')
- && get_pending_status (lwp_list, &status) != -1
+ && get_pending_status (main_lwp, &status) != -1
&& WIFSTOPPED (status))
{
/* Put the signal number in ARGS so that inf_ptrace_detach will
pass it along with PTRACE_DETACH. */
args = alloca (8);
sprintf (args, "%d", (int) WSTOPSIG (status));
- fprintf_unfiltered (gdb_stdlog,
- "LND: Sending signal %s to %s\n",
- args,
- target_pid_to_str (lwp_list->ptid));
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LND: Sending signal %s to %s\n",
+ args,
+ target_pid_to_str (main_lwp->ptid));
}
- /* Destroy LWP info; it's no longer valid. */
- init_lwp_list ();
-
- pid = GET_PID (inferior_ptid);
- inferior_ptid = pid_to_ptid (pid);
- linux_ops->to_detach (args, from_tty);
+ delete_lwp (main_lwp->ptid);
- if (target_can_async_p ())
- drain_queued_events (pid);
+ if (forks_exist_p ())
+ {
+ /* Multi-fork case. The current inferior_ptid is being detached
+ from, but there are other viable forks to debug. Detach from
+ the current fork, and context-switch to the first
+ available. */
+ linux_fork_detach (args, from_tty);
+
+ if (non_stop && target_can_async_p ())
+ target_async (inferior_event_handler, 0);
+ }
+ else
+ linux_ops->to_detach (ops, args, from_tty);
}
/* Resume LP. */
static int
resume_callback (struct lwp_info *lp, void *data)
{
- if (lp->stopped && lp->status == 0)
+ struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid));
+
+ if (lp->stopped && inf->vfork_child != NULL)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RC: Not resuming %s (vfork parent)\n",
+ target_pid_to_str (lp->ptid));
+ }
+ else if (lp->stopped && lp->status == 0)
{
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
- 0, TARGET_SIGNAL_0);
+ struct thread_info *tp = find_thread_ptid (lp->ptid);
+ /* lp->step may already contain a stale value. */
+ int step = tp ? currently_stepping (tp) : 0;
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RC: %s %s, 0, 0 (resuming sibling)\n",
+ step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
+ target_pid_to_str (lp->ptid));
+
+ linux_ops->to_resume (linux_ops,
+ pid_to_ptid (GET_LWP (lp->ptid)),
+ step, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
- "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
+ "RC: %s %s, 0, 0 (resume sibling)\n",
+ step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
target_pid_to_str (lp->ptid));
lp->stopped = 0;
- lp->step = 0;
+ lp->step = step;
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+ lp->stopped_by_watchpoint = 0;
}
else if (lp->stopped && debug_linux_nat)
fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n",
}
static void
-linux_nat_resume (ptid_t ptid, int step, enum target_signal signo)
+linux_nat_resume (struct target_ops *ops,
+ ptid_t ptid, int step, enum target_signal signo)
{
+ sigset_t prev_mask;
struct lwp_info *lp;
- int resume_all;
+ int resume_many;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
step ? "step" : "resume",
target_pid_to_str (ptid),
- signo ? strsignal (signo) : "0",
+ (signo != TARGET_SIGNAL_0
+ ? strsignal (target_signal_to_host (signo)) : "0"),
target_pid_to_str (inferior_ptid));
- if (target_can_async_p ())
- /* Block events while we're here. */
- linux_nat_async_events (sigchld_sync);
+ block_child_signals (&prev_mask);
/* A specific PTID means `step only this process id'. */
- resume_all = (PIDGET (ptid) == -1);
-
- if (non_stop && resume_all)
- internal_error (__FILE__, __LINE__,
- "can't resume all in non-stop mode");
-
- if (!non_stop)
- {
- if (resume_all)
- iterate_over_lwps (resume_set_callback, NULL);
- else
- iterate_over_lwps (resume_clear_callback, NULL);
- }
+ resume_many = (ptid_equal (minus_one_ptid, ptid)
+ || ptid_is_pid (ptid));
- /* If PID is -1, it's the current inferior that should be
- handled specially. */
- if (PIDGET (ptid) == -1)
- ptid = inferior_ptid;
+ /* Mark the lwps we're resuming as resumed. */
+ iterate_over_lwps (ptid, resume_set_callback, NULL);
- lp = find_lwp_pid (ptid);
+ /* See if it's the current inferior that should be handled
+ specially. */
+ if (resume_many)
+ lp = find_lwp_pid (inferior_ptid);
+ else
+ lp = find_lwp_pid (ptid);
gdb_assert (lp != NULL);
- /* Convert to something the lower layer understands. */
- ptid = pid_to_ptid (GET_LWP (lp->ptid));
-
/* Remember if we're stepping. */
lp->step = step;
- /* Mark this LWP as resumed. */
- lp->resumed = 1;
-
/* If we have a pending wait status for this thread, there is no
point in resuming the process. But first make sure that
linux_nat_wait won't preemptively handle the event - we
other threads. This bit of code needs to be synchronized
with linux_nat_wait. */
- /* In async mode, we never have pending wait status. */
- if (target_can_async_p () && lp->status)
- internal_error (__FILE__, __LINE__, "Pending status in async mode");
-
if (lp->status && WIFSTOPPED (lp->status))
{
- int saved_signo;
+ enum target_signal saved_signo;
struct inferior *inf;
- inf = find_inferior_pid (ptid_get_pid (ptid));
+ inf = find_inferior_pid (ptid_get_pid (lp->ptid));
gdb_assert (inf);
saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
}
}
- if (lp->status)
+ if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
{
/* FIXME: What should we do if we are supposed to continue
this thread with a signal? */
"LLR: Short circuiting for status 0x%x\n",
lp->status);
+ restore_child_signals_mask (&prev_mask);
+ if (target_can_async_p ())
+ {
+ target_async (inferior_event_handler, 0);
+ /* Tell the event loop we have something to process. */
+ async_file_mark ();
+ }
return;
}
resume_callback. */
lp->stopped = 0;
- if (resume_all)
- iterate_over_lwps (resume_callback, NULL);
+ if (resume_many)
+ iterate_over_lwps (ptid, resume_callback, NULL);
+
+ /* Convert to something the lower layer understands. */
+ ptid = pid_to_ptid (GET_LWP (lp->ptid));
- linux_ops->to_resume (ptid, step, signo);
+ linux_ops->to_resume (linux_ops, ptid, step, signo);
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+ lp->stopped_by_watchpoint = 0;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLR: %s %s, %s (resume event thread)\n",
step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
target_pid_to_str (ptid),
- signo ? strsignal (signo) : "0");
+ (signo != TARGET_SIGNAL_0
+ ? strsignal (target_signal_to_host (signo)) : "0"));
+ restore_child_signals_mask (&prev_mask);
if (target_can_async_p ())
target_async (inferior_event_handler, 0);
}
-/* Issue kill to specified lwp. */
-
-static int tkill_failed;
+/* Send a signal to an LWP. */
static int
kill_lwp (int lwpid, int signo)
{
- errno = 0;
-
-/* Use tkill, if possible, in case we are using nptl threads. If tkill
- fails, then we are not using nptl threads and we should be using kill. */
+ /* Use tkill, if possible, in case we are using nptl threads. If tkill
+ fails, then we are not using nptl threads and we should be using kill. */
#ifdef HAVE_TKILL_SYSCALL
- if (!tkill_failed)
- {
- int ret = syscall (__NR_tkill, lwpid, signo);
- if (errno != ENOSYS)
- return ret;
- errno = 0;
- tkill_failed = 1;
- }
+ {
+ static int tkill_failed;
+
+ if (!tkill_failed)
+ {
+ int ret;
+
+ errno = 0;
+ ret = syscall (__NR_tkill, lwpid, signo);
+ if (errno != ENOSYS)
+ return ret;
+ tkill_failed = 1;
+ }
+ }
#endif
return kill (lwpid, signo);
}
+/* Handle a GNU/Linux syscall trap wait response. If we see a syscall
+ event, check if the core is interested in it: if not, ignore the
+ event, and keep waiting; otherwise, we need to toggle the LWP's
+ syscall entry/exit status, since the ptrace event itself doesn't
+ indicate it, and report the trap to higher layers. */
+
+static int
+linux_handle_syscall_trap (struct lwp_info *lp, int stopping)
+{
+ struct target_waitstatus *ourstatus = &lp->waitstatus;
+ struct gdbarch *gdbarch = target_thread_architecture (lp->ptid);
+ int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid);
+
+ if (stopping)
+ {
+ /* If we're stopping threads, there's a SIGSTOP pending, which
+ makes it so that the LWP reports an immediate syscall return,
+ followed by the SIGSTOP. Skip seeing that "return" using
+ PTRACE_CONT directly, and let stop_wait_callback collect the
+ SIGSTOP. Later when the thread is resumed, a new syscall
+ entry event. If we didn't do this (and returned 0), we'd
+ leave a syscall entry pending, and our caller, by using
+ PTRACE_CONT to collect the SIGSTOP, skips the syscall return
+ itself. Later, when the user re-resumes this LWP, we'd see
+ another syscall entry event and we'd mistake it for a return.
+
+ If stop_wait_callback didn't force the SIGSTOP out of the LWP
+ (leaving immediately with LWP->signalled set, without issuing
+ a PTRACE_CONT), it would still be problematic to leave this
+ syscall enter pending, as later when the thread is resumed,
+ it would then see the same syscall exit mentioned above,
+ followed by the delayed SIGSTOP, while the syscall didn't
+ actually get to execute. It seems it would be even more
+ confusing to the user. */
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHST: ignoring syscall %d "
+ "for LWP %ld (stopping threads), "
+ "resuming with PTRACE_CONT for SIGSTOP\n",
+ syscall_number,
+ GET_LWP (lp->ptid));
+
+ lp->syscall_state = TARGET_WAITKIND_IGNORE;
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ return 1;
+ }
+
+ if (catch_syscall_enabled ())
+ {
+ /* Always update the entry/return state, even if this particular
+ syscall isn't interesting to the core now. In async mode,
+ the user could install a new catchpoint for this syscall
+ between syscall enter/return, and we'll need to know to
+ report a syscall return if that happens. */
+ lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY
+ ? TARGET_WAITKIND_SYSCALL_RETURN
+ : TARGET_WAITKIND_SYSCALL_ENTRY);
+
+ if (catching_syscall_number (syscall_number))
+ {
+ /* Alright, an event to report. */
+ ourstatus->kind = lp->syscall_state;
+ ourstatus->value.syscall_number = syscall_number;
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHST: stopping for %s of syscall %d"
+ " for LWP %ld\n",
+ lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY
+ ? "entry" : "return",
+ syscall_number,
+ GET_LWP (lp->ptid));
+ return 0;
+ }
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHST: ignoring %s of syscall %d "
+ "for LWP %ld\n",
+ lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY
+ ? "entry" : "return",
+ syscall_number,
+ GET_LWP (lp->ptid));
+ }
+ else
+ {
+ /* If we had been syscall tracing, and hence used PT_SYSCALL
+ before on this LWP, it could happen that the user removes all
+ syscall catchpoints before we get to process this event.
+ There are two noteworthy issues here:
+
+ - When stopped at a syscall entry event, resuming with
+ PT_STEP still resumes executing the syscall and reports a
+ syscall return.
+
+ - Only PT_SYSCALL catches syscall enters. If we last
+ single-stepped this thread, then this event can't be a
+ syscall enter. If we last single-stepped this thread, this
+ has to be a syscall exit.
+
+ The points above mean that the next resume, be it PT_STEP or
+ PT_CONTINUE, can not trigger a syscall trace event. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHST: caught syscall event with no syscall catchpoints."
+ " %d for LWP %ld, ignoring\n",
+ syscall_number,
+ GET_LWP (lp->ptid));
+ lp->syscall_state = TARGET_WAITKIND_IGNORE;
+ }
+
+ /* The core isn't interested in this event. For efficiency, avoid
+ stopping all threads only to have the core resume them all again.
+ Since we're not stopping threads, if we're still syscall tracing
+ and not stepping, we can't use PTRACE_CONT here, as we'd miss any
+ subsequent syscall. Simply resume using the inf-ptrace layer,
+ which knows when to use PT_SYSCALL or PT_CONTINUE. */
+
+ /* Note that gdbarch_get_syscall_number may access registers, hence
+ fill a regcache. */
+ registers_changed ();
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
+ lp->step, TARGET_SIGNAL_0);
+ return 1;
+}
+
/* Handle a GNU/Linux extended wait response. If we see a clone
event, we need to add the new LWP to our list (and not report the
trap to higher layers). This function returns non-zero if the
{
int pid = GET_LWP (lp->ptid);
struct target_waitstatus *ourstatus = &lp->waitstatus;
- struct lwp_info *new_lp = NULL;
int event = status >> 16;
if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0);
+ if (event == PTRACE_EVENT_FORK
+ && linux_fork_checkpointing_p (GET_PID (lp->ptid)))
+ {
+ struct fork_info *fp;
+
+ /* Handle checkpointing by linux-fork.c here as a special
+ case. We don't want the follow-fork-mode or 'catch fork'
+ to interfere with this. */
+
+ /* This won't actually modify the breakpoint list, but will
+ physically remove the breakpoints from the child. */
+ detach_breakpoints (new_pid);
+
+ /* Retain child fork in ptrace (stopped) state. */
+ fp = find_fork_pid (new_pid);
+ if (!fp)
+ fp = add_fork (new_pid);
+
+ /* Report as spurious, so that infrun doesn't want to follow
+ this fork. We're actually doing an infcall in
+ linux-fork.c. */
+ ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ linux_enable_event_reporting (pid_to_ptid (new_pid));
+
+ /* Report the stop to the core. */
+ return 0;
+ }
+
if (event == PTRACE_EVENT_FORK)
ourstatus->kind = TARGET_WAITKIND_FORKED;
else if (event == PTRACE_EVENT_VFORK)
ourstatus->kind = TARGET_WAITKIND_VFORKED;
else
{
- struct cleanup *old_chain;
+ struct lwp_info *new_lp;
ourstatus->kind = TARGET_WAITKIND_IGNORE;
- new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid)));
+
+ new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid)));
new_lp->cloned = 1;
new_lp->stopped = 1;
}
}
+ /* Note the need to use the low target ops to resume, to
+ handle resuming with PT_SYSCALL if we have syscall
+ catchpoints. */
if (!stopping)
{
+ enum target_signal signo;
+
new_lp->stopped = 0;
new_lp->resumed = 1;
- ptrace (PTRACE_CONT, new_pid, 0,
- status ? WSTOPSIG (status) : 0);
+
+ signo = (status
+ ? target_signal_from_host (WSTOPSIG (status))
+ : TARGET_SIGNAL_0);
+
+ linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid),
+ 0, signo);
+ }
+ else
+ {
+ if (status != 0)
+ {
+ /* We created NEW_LP so it cannot yet contain STATUS. */
+ gdb_assert (new_lp->status == 0);
+
+ /* Save the wait status to report later. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: waitpid of new LWP %ld, "
+ "saving status %s\n",
+ (long) GET_LWP (new_lp->ptid),
+ status_to_str (status));
+ new_lp->status = status;
+ }
}
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LHEW: Got clone event from LWP %ld, resuming\n",
GET_LWP (lp->ptid));
- ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
+ 0, TARGET_SIGNAL_0);
return 1;
}
if (event == PTRACE_EVENT_EXEC)
{
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: Got exec event from LWP %ld\n",
+ GET_LWP (lp->ptid));
+
ourstatus->kind = TARGET_WAITKIND_EXECD;
ourstatus->value.execd_pathname
= xstrdup (linux_child_pid_to_exec_file (pid));
- if (linux_parent_pid)
+ return 0;
+ }
+
+ if (event == PTRACE_EVENT_VFORK_DONE)
+ {
+ if (current_inferior ()->waiting_for_vfork_done)
{
- detach_breakpoints (linux_parent_pid);
- ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "\
+LHEW: Got expected PTRACE_EVENT_VFORK_DONE from LWP %ld: stopping\n",
+ GET_LWP (lp->ptid));
- linux_parent_pid = 0;
+ ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
+ return 0;
}
- /* At this point, all inserted breakpoints are gone. Doing this
- as soon as we detect an exec prevents the badness of deleting
- a breakpoint writing the current "shadow contents" to lift
- the bp. That shadow is NOT valid after an exec.
-
- Note that we have to do this after the detach_breakpoints
- call above, otherwise breakpoints wouldn't be lifted from the
- parent on a vfork, because detach_breakpoints would think
- that breakpoints are not inserted. */
- mark_breakpoints_out ();
- return 0;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "\
+LHEW: Got PTRACE_EVENT_VFORK_DONE from LWP %ld: resuming\n",
+ GET_LWP (lp->ptid));
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ return 1;
}
internal_error (__FILE__, __LINE__,
gdb_assert (WIFSTOPPED (status));
+ /* Handle GNU/Linux's syscall SIGTRAPs. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP)
+ {
+ /* No longer need the sysgood bit. The ptrace event ends up
+ recorded in lp->waitstatus if we care for it. We can carry
+ on handling the event like a regular SIGTRAP from here
+ on. */
+ status = W_STOPCODE (SIGTRAP);
+ if (linux_handle_syscall_trap (lp, 1))
+ return wait_lwp (lp);
+ }
+
/* Handle GNU/Linux's extended waitstatus for trace events. */
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
{
linux_nat_has_pending_sigint (int pid)
{
sigset_t pending, blocked, ignored;
- int i;
linux_proc_pending_signals (pid, &pending, &blocked, &ignored);
}
}
-/* Wait until LP is stopped. */
+/* Fetch the possible triggered data watchpoint info and store it in
+ LP.
+
+ On some archs, like x86, that use debug registers to set
+ watchpoints, it's possible that the way to know which watched
+ address trapped, is to check the register that is used to select
+ which address to watch. Problem is, between setting the watchpoint
+ and reading back which data address trapped, the user may change
+ the set of watchpoints, and, as a consequence, GDB changes the
+ debug registers in the inferior. To avoid reading back a stale
+ stopped-data-address when that happens, we cache in LP the fact
+ that a watchpoint trapped, and the corresponding data address, as
+ soon as we see LP stop with a SIGTRAP. If GDB changes the debug
+ registers meanwhile, we have the cached data we can rely on. */
-static int
-stop_wait_callback (struct lwp_info *lp, void *data)
+static void
+save_sigtrap (struct lwp_info *lp)
{
- if (!lp->stopped)
+ struct cleanup *old_chain;
+
+ if (linux_ops->to_stopped_by_watchpoint == NULL)
{
- int status;
+ lp->stopped_by_watchpoint = 0;
+ return;
+ }
- status = wait_lwp (lp);
- if (status == 0)
- return 0;
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = lp->ptid;
- if (lp->ignore_sigint && WIFSTOPPED (status)
- && WSTOPSIG (status) == SIGINT)
- {
- lp->ignore_sigint = 0;
+ lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint ();
- errno = 0;
- ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n",
- target_pid_to_str (lp->ptid),
- errno ? safe_strerror (errno) : "OK");
+ if (lp->stopped_by_watchpoint)
+ {
+ if (linux_ops->to_stopped_data_address != NULL)
+ lp->stopped_data_address_p =
+ linux_ops->to_stopped_data_address (¤t_target,
+ &lp->stopped_data_address);
+ else
+ lp->stopped_data_address_p = 0;
+ }
- return stop_wait_callback (lp, NULL);
- }
+ do_cleanups (old_chain);
+}
- maybe_clear_ignore_sigint (lp);
+/* See save_sigtrap. */
- if (WSTOPSIG (status) != SIGSTOP)
- {
- if (WSTOPSIG (status) == SIGTRAP)
- {
- /* If a LWP other than the LWP that we're reporting an
- event for has hit a GDB breakpoint (as opposed to
- some random trap signal), then just arrange for it to
- hit it again later. We don't keep the SIGTRAP status
- and don't forward the SIGTRAP signal to the LWP. We
- will handle the current event, eventually we will
- resume all LWPs, and this one will get its breakpoint
- trap again.
+static int
+linux_nat_stopped_by_watchpoint (void)
+{
+ struct lwp_info *lp = find_lwp_pid (inferior_ptid);
- If we do not do this, then we run the risk that the
- user will delete or disable the breakpoint, but the
- thread will have already tripped on it. */
+ gdb_assert (lp != NULL);
+
+ return lp->stopped_by_watchpoint;
+}
+
+static int
+linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
+{
+ struct lwp_info *lp = find_lwp_pid (inferior_ptid);
+
+ gdb_assert (lp != NULL);
+
+ *addr_p = lp->stopped_data_address;
+
+ return lp->stopped_data_address_p;
+}
+
+/* Commonly any breakpoint / watchpoint generate only SIGTRAP. */
+
+static int
+sigtrap_is_event (int status)
+{
+ return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP;
+}
+
+/* SIGTRAP-like events recognizer. */
+
+static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event;
+
+/* Check for SIGTRAP-like events in LP. */
+
+static int
+linux_nat_lp_status_is_event (struct lwp_info *lp)
+{
+ /* We check for lp->waitstatus in addition to lp->status, because we can
+ have pending process exits recorded in lp->status
+ and W_EXITCODE(0,0) == 0. We should probably have an additional
+ lp->status_p flag. */
+
+ return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE
+ && linux_nat_status_is_event (lp->status));
+}
+
+/* Set alternative SIGTRAP-like events recognizer. If
+ breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be
+ applied. */
+
+void
+linux_nat_set_status_is_event (struct target_ops *t,
+ int (*status_is_event) (int status))
+{
+ linux_nat_status_is_event = status_is_event;
+}
+
+/* Wait until LP is stopped. */
+
+static int
+stop_wait_callback (struct lwp_info *lp, void *data)
+{
+ struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid));
+
+ /* If this is a vfork parent, bail out, it is not going to report
+ any SIGSTOP until the vfork is done with. */
+ if (inf->vfork_child != NULL)
+ return 0;
+
+ if (!lp->stopped)
+ {
+ int status;
+
+ status = wait_lwp (lp);
+ if (status == 0)
+ return 0;
+
+ if (lp->ignore_sigint && WIFSTOPPED (status)
+ && WSTOPSIG (status) == SIGINT)
+ {
+ lp->ignore_sigint = 0;
+
+ errno = 0;
+ ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n",
+ target_pid_to_str (lp->ptid),
+ errno ? safe_strerror (errno) : "OK");
+
+ return stop_wait_callback (lp, NULL);
+ }
+
+ maybe_clear_ignore_sigint (lp);
+
+ if (WSTOPSIG (status) != SIGSTOP)
+ {
+ if (linux_nat_status_is_event (status))
+ {
+ /* If a LWP other than the LWP that we're reporting an
+ event for has hit a GDB breakpoint (as opposed to
+ some random trap signal), then just arrange for it to
+ hit it again later. We don't keep the SIGTRAP status
+ and don't forward the SIGTRAP signal to the LWP. We
+ will handle the current event, eventually we will
+ resume all LWPs, and this one will get its breakpoint
+ trap again.
+
+ If we do not do this, then we run the risk that the
+ user will delete or disable the breakpoint, but the
+ thread will have already tripped on it. */
/* Save the trap's siginfo in case we need it later. */
save_siginfo (lp);
+ save_sigtrap (lp);
+
/* Now resume this LWP and get the SIGSTOP event. */
errno = 0;
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
there are any more (we still want to get that SIGSTOP). */
stop_wait_callback (lp, NULL);
- if (target_can_async_p ())
+ /* Hold the SIGTRAP for handling by linux_nat_wait. If
+ there's another event, throw it back into the
+ queue. */
+ if (lp->status)
{
- /* Don't leave a pending wait status in async mode.
- Retrigger the breakpoint. */
- if (!cancel_breakpoint (lp))
- {
- /* There was no gdb breakpoint set at pc. Put
- the event back in the queue. */
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog, "\
-SWC: leaving SIGTRAP in local queue of %s\n", target_pid_to_str (lp->ptid));
- push_waitpid (GET_LWP (lp->ptid),
- W_STOPCODE (SIGTRAP),
- lp->cloned ? __WCLONE : 0);
- }
- }
- else
- {
- /* Hold the SIGTRAP for handling by
- linux_nat_wait. */
- /* If there's another event, throw it back into the
- queue. */
- if (lp->status)
- {
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "SWC: kill %s, %s\n",
- target_pid_to_str (lp->ptid),
- status_to_str ((int) status));
- kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
- }
- /* Save the sigtrap event. */
- lp->status = status;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SWC: kill %s, %s\n",
+ target_pid_to_str (lp->ptid),
+ status_to_str ((int) status));
+ kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
}
+
+ /* Save the sigtrap event. */
+ lp->status = status;
return 0;
}
else
/* If the lp->status field is still empty, use it to
hold this event. If not, then this event must be
returned to the event queue of the LWP. */
- if (lp->status || target_can_async_p ())
+ if (lp->status)
{
if (debug_linux_nat)
{
{
/* Only report a pending wait status if we pretend that this has
indeed been resumed. */
- return (lp->status != 0 && lp->resumed);
+ if (!lp->resumed)
+ return 0;
+
+ if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
+ {
+ /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event,
+ or a a pending process exit. Note that `W_EXITCODE(0,0) ==
+ 0', so a clean process exit can not be stored pending in
+ lp->status, it is indistinguishable from
+ no-pending-status. */
+ return 1;
+ }
+
+ if (lp->status != 0)
+ return 1;
+
+ return 0;
}
/* Return non-zero if LP isn't stopped. */
gdb_assert (count != NULL);
/* Count only resumed LWPs that have a SIGTRAP event pending. */
- if (lp->status != 0 && lp->resumed
- && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
+ if (lp->resumed && linux_nat_lp_status_is_event (lp))
(*count)++;
return 0;
gdb_assert (selector != NULL);
/* Select only resumed LWPs that have a SIGTRAP event pending. */
- if (lp->status != 0 && lp->resumed
- && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
+ if (lp->resumed && linux_nat_lp_status_is_event (lp))
if ((*selector)-- == 0)
return 1;
CORE_ADDR pc;
pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch);
- if (breakpoint_inserted_here_p (pc))
+ if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
delete or disable the breakpoint, but the LWP will have already
tripped on it. */
- if (lp->status != 0
- && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
+ if (linux_nat_lp_status_is_event (lp)
&& cancel_breakpoint (lp))
/* Throw away the SIGTRAP. */
lp->status = 0;
/* Select one LWP out of those that have events pending. */
static void
-select_event_lwp (struct lwp_info **orig_lp, int *status)
+select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status)
{
int num_events = 0;
int random_selector;
(*orig_lp)->status = *status;
/* Give preference to any LWP that is being single-stepped. */
- event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL);
+ event_lp = iterate_over_lwps (filter,
+ select_singlestep_lwp_callback, NULL);
if (event_lp != NULL)
{
if (debug_linux_nat)
which have had SIGTRAP events. */
/* First see how many SIGTRAP events we have. */
- iterate_over_lwps (count_events_callback, &num_events);
+ iterate_over_lwps (filter, count_events_callback, &num_events);
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
random_selector = (int)
"SEL: Found %d SIGTRAP events, selecting #%d\n",
num_events, random_selector);
- event_lp = iterate_over_lwps (select_event_lwp_callback,
+ event_lp = iterate_over_lwps (filter,
+ select_event_lwp_callback,
&random_selector);
}
add_thread (lp->ptid);
}
- /* Save the trap's siginfo in case we need it later. */
- if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
- save_siginfo (lp);
+ /* Handle GNU/Linux's syscall SIGTRAPs. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP)
+ {
+ /* No longer need the sysgood bit. The ptrace event ends up
+ recorded in lp->waitstatus if we care for it. We can carry
+ on handling the event like a regular SIGTRAP from here
+ on. */
+ status = W_STOPCODE (SIGTRAP);
+ if (linux_handle_syscall_trap (lp, 0))
+ return NULL;
+ }
/* Handle GNU/Linux's extended waitstatus for trace events. */
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
return NULL;
}
+ if (linux_nat_status_is_event (status))
+ {
+ /* Save the trap's siginfo in case we need it later. */
+ save_siginfo (lp);
+
+ save_sigtrap (lp);
+ }
+
/* Check if the thread has exited. */
- if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
+ if ((WIFEXITED (status) || WIFSIGNALED (status))
+ && num_lwps (GET_PID (lp->ptid)) > 1)
{
- /* If this is the main thread, we must stop all threads and
- verify if they are still alive. This is because in the nptl
- thread model, there is no signal issued for exiting LWPs
+ /* If this is the main thread, we must stop all threads and verify
+ if they are still alive. This is because in the nptl thread model
+ on Linux 2.4, there is no signal issued for exiting LWPs
other than the main thread. We only get the main thread exit
signal once all child threads have already exited. If we
stop all the threads and use the stop_wait_callback to check
if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
{
lp->stopped = 1;
- iterate_over_lwps (stop_and_resume_callback, NULL);
+ iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)),
+ stop_and_resume_callback, NULL);
}
if (debug_linux_nat)
"LLW: %s exited.\n",
target_pid_to_str (lp->ptid));
- exit_lwp (lp);
-
- /* If there is at least one more LWP, then the exit signal was
- not the end of the debugged application and should be
- ignored. */
- if (num_lwps > 0)
- return NULL;
+ if (num_lwps (GET_PID (lp->ptid)) > 1)
+ {
+ /* If there is at least one more LWP, then the exit signal
+ was not the end of the debugged application and should be
+ ignored. */
+ exit_lwp (lp);
+ return NULL;
+ }
}
/* Check if the current LWP has previously exited. In the nptl
thread model, LWPs other than the main thread do not issue
signals when they exit so we must check whenever the thread has
stopped. A similar check is made in stop_wait_callback(). */
- if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
+ if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid))
{
+ ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid));
+
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLW: %s exited.\n",
exit_lwp (lp);
/* Make sure there is at least one thread running. */
- gdb_assert (iterate_over_lwps (running_callback, NULL));
+ gdb_assert (iterate_over_lwps (ptid, running_callback, NULL));
/* Discard the event. */
return NULL;
registers_changed ();
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
lp->step, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
lp->ignore_sigint = 0;
registers_changed ();
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
lp->step, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
/* An interesting event. */
gdb_assert (lp);
+ lp->status = status;
return lp;
}
-/* Get the events stored in the pipe into the local queue, so they are
- accessible to queued_waitpid. We need to do this, since it is not
- always the case that the event at the head of the pipe is the event
- we want. */
-
-static void
-pipe_to_local_event_queue (void)
-{
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog,
- "PTLEQ: linux_nat_num_queued_events(%d)\n",
- linux_nat_num_queued_events);
- while (linux_nat_num_queued_events)
- {
- int lwpid, status, options;
- lwpid = linux_nat_event_pipe_pop (&status, &options);
- gdb_assert (lwpid > 0);
- push_waitpid (lwpid, status, options);
- }
-}
-
-/* Get the unprocessed events stored in the local queue back into the
- pipe, so the event loop realizes there's something else to
- process. */
-
-static void
-local_event_queue_to_pipe (void)
-{
- struct waitpid_result *w = waitpid_queue;
- while (w)
- {
- struct waitpid_result *next = w->next;
- linux_nat_event_pipe_push (w->pid,
- w->status,
- w->options);
- xfree (w);
- w = next;
- }
- waitpid_queue = NULL;
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog,
- "LEQTP: linux_nat_num_queued_events(%d)\n",
- linux_nat_num_queued_events);
-}
-
static ptid_t
-linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
+linux_nat_wait_1 (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
{
+ static sigset_t prev_mask;
struct lwp_info *lp = NULL;
int options = 0;
int status = 0;
- pid_t pid = PIDGET (ptid);
+ pid_t pid;
if (debug_linux_nat_async)
fprintf_unfiltered (gdb_stdlog, "LLW: enter\n");
/* The first time we get here after starting a new inferior, we may
not have added it to the LWP list yet - this is the earliest
moment at which we know its PID. */
- if (num_lwps == 0)
+ if (ptid_is_pid (inferior_ptid))
{
- gdb_assert (!is_lwp (inferior_ptid));
-
/* Upgrade the main thread's ptid. */
thread_change_ptid (inferior_ptid,
BUILD_LWP (GET_PID (inferior_ptid),
lp->resumed = 1;
}
- /* Block events while we're here. */
- linux_nat_async_events (sigchld_sync);
+ /* Make sure SIGCHLD is blocked. */
+ block_child_signals (&prev_mask);
+
+ if (ptid_equal (ptid, minus_one_ptid))
+ pid = -1;
+ else if (ptid_is_pid (ptid))
+ /* A request to wait for a specific tgid. This is not possible
+ with waitpid, so instead, we wait for any child, and leave
+ children we're not interested in right now with a pending
+ status to report later. */
+ pid = -1;
+ else
+ pid = GET_LWP (ptid);
retry:
+ lp = NULL;
+ status = 0;
+
+ /* Make sure that of those LWPs we want to get an event from, there
+ is at least one LWP that has been resumed. If there's none, just
+ bail out. The core may just be flushing asynchronously all
+ events. */
+ if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL)
+ {
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n");
- /* Make sure there is at least one LWP that has been resumed. */
- gdb_assert (iterate_over_lwps (resumed_callback, NULL));
+ restore_child_signals_mask (&prev_mask);
+ return minus_one_ptid;
+ }
/* First check if there is a LWP with a wait status pending. */
if (pid == -1)
{
/* Any LWP that's been resumed will do. */
- lp = iterate_over_lwps (status_callback, NULL);
+ lp = iterate_over_lwps (ptid, status_callback, NULL);
if (lp)
{
- if (target_can_async_p ())
- internal_error (__FILE__, __LINE__,
- "Found an LWP with a pending status in async mode.");
-
- status = lp->status;
- lp->status = 0;
-
- if (debug_linux_nat && status)
+ if (debug_linux_nat && lp->status)
fprintf_unfiltered (gdb_stdlog,
"LLW: Using pending wait status %s for %s.\n",
- status_to_str (status),
+ status_to_str (lp->status),
target_pid_to_str (lp->ptid));
}
/* But if we don't find one, we'll have to wait, and check both
- cloned and uncloned processes. We start with the cloned
- processes. */
+ cloned and uncloned processes. We start with the cloned
+ processes. */
options = __WCLONE | WNOHANG;
}
else if (is_lwp (ptid))
/* We have a specific LWP to check. */
lp = find_lwp_pid (ptid);
gdb_assert (lp);
- status = lp->status;
- lp->status = 0;
- if (debug_linux_nat && status)
+ if (debug_linux_nat && lp->status)
fprintf_unfiltered (gdb_stdlog,
"LLW: Using pending wait status %s for %s.\n",
- status_to_str (status),
+ status_to_str (lp->status),
target_pid_to_str (lp->ptid));
/* If we have to wait, take into account whether PID is a cloned
the layer beneath us can understand. */
options = lp->cloned ? __WCLONE : 0;
pid = GET_LWP (ptid);
+
+ /* We check for lp->waitstatus in addition to lp->status,
+ because we can have pending process exits recorded in
+ lp->status and W_EXITCODE(0,0) == 0. We should probably have
+ an additional lp->status_p flag. */
+ if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE)
+ lp = NULL;
}
- if (status && lp->signalled)
+ if (lp && lp->signalled)
{
/* A pending SIGSTOP may interfere with the normal stream of
events. In a typical case where interference is a problem,
/* Resume the thread. It should halt immediately returning the
pending SIGSTOP. */
registers_changed ();
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
lp->step, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
lp->stopped = 0;
gdb_assert (lp->resumed);
- /* This should catch the pending SIGSTOP. */
+ /* Catch the pending SIGSTOP. */
+ status = lp->status;
+ lp->status = 0;
+
stop_wait_callback (lp, NULL);
+
+ /* If the lp->status field isn't empty, we caught another signal
+ while flushing the SIGSTOP. Return it back to the event
+ queue of the LWP, as we already have an event to handle. */
+ if (lp->status)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: kill %s, %s\n",
+ target_pid_to_str (lp->ptid),
+ status_to_str (lp->status));
+ kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
+ }
+
+ lp->status = status;
}
if (!target_can_async_p ())
{
/* Causes SIGINT to be passed on to the attached process. */
set_sigint_trap ();
- set_sigio_trap ();
}
- while (status == 0)
+ /* Translate generic target_wait options into waitpid options. */
+ if (target_options & TARGET_WNOHANG)
+ options |= WNOHANG;
+
+ while (lp == NULL)
{
pid_t lwpid;
- if (target_can_async_p ())
- /* In async mode, don't ever block. Only look at the locally
- queued events. */
- lwpid = queued_waitpid (pid, &status, options);
- else
- lwpid = my_waitpid (pid, &status, options);
+ lwpid = my_waitpid (pid, &status, options);
if (lwpid > 0)
{
}
lp = linux_nat_filter_event (lwpid, status, options);
- if (!lp)
+
+ /* STATUS is now no longer valid, use LP->STATUS instead. */
+ status = 0;
+
+ if (lp
+ && ptid_is_pid (ptid)
+ && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid))
{
- /* A discarded event. */
- status = 0;
+ gdb_assert (lp->resumed);
+
+ if (debug_linux_nat)
+ fprintf (stderr, "LWP %ld got an event %06x, leaving pending.\n",
+ ptid_get_lwp (lp->ptid), lp->status);
+
+ if (WIFSTOPPED (lp->status))
+ {
+ if (WSTOPSIG (lp->status) != SIGSTOP)
+ {
+ /* Cancel breakpoint hits. The breakpoint may
+ be removed before we fetch events from this
+ process to report to the core. It is best
+ not to assume the moribund breakpoints
+ heuristic always handles these cases --- it
+ could be too many events go through to the
+ core before this one is handled. All-stop
+ always cancels breakpoint hits in all
+ threads. */
+ if (non_stop
+ && linux_nat_lp_status_is_event (lp)
+ && cancel_breakpoint (lp))
+ {
+ /* Throw away the SIGTRAP. */
+ lp->status = 0;
+
+ if (debug_linux_nat)
+ fprintf (stderr,
+ "LLW: LWP %ld hit a breakpoint while waiting "
+ "for another process; cancelled it\n",
+ ptid_get_lwp (lp->ptid));
+ }
+ lp->stopped = 1;
+ }
+ else
+ {
+ lp->stopped = 1;
+ lp->signalled = 0;
+ }
+ }
+ else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status))
+ {
+ if (debug_linux_nat)
+ fprintf (stderr, "Process %ld exited while stopping LWPs\n",
+ ptid_get_lwp (lp->ptid));
+
+ /* This was the last lwp in the process. Since
+ events are serialized to GDB core, and we can't
+ report this one right now, but GDB core and the
+ other target layers will want to be notified
+ about the exit code/signal, leave the status
+ pending for the next time we're able to report
+ it. */
+
+ /* Prevent trying to stop this thread again. We'll
+ never try to resume it because it has a pending
+ status. */
+ lp->stopped = 1;
+
+ /* Dead LWP's aren't expected to reported a pending
+ sigstop. */
+ lp->signalled = 0;
+
+ /* Store the pending event in the waitstatus as
+ well, because W_EXITCODE(0,0) == 0. */
+ store_waitstatus (&lp->waitstatus, lp->status);
+ }
+
+ /* Keep looking. */
+ lp = NULL;
continue;
}
- break;
+ if (lp)
+ break;
+ else
+ {
+ if (pid == -1)
+ {
+ /* waitpid did return something. Restart over. */
+ options |= __WCLONE;
+ }
+ continue;
+ }
}
if (pid == -1)
In sync mode, suspend waiting for a SIGCHLD signal. */
if (options & __WCLONE)
{
- if (target_can_async_p ())
+ if (target_options & TARGET_WNOHANG)
{
/* No interesting event. */
ourstatus->kind = TARGET_WAITKIND_IGNORE;
- /* Get ready for the next event. */
- target_async (inferior_event_handler, 0);
-
if (debug_linux_nat_async)
fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n");
+ restore_child_signals_mask (&prev_mask);
return minus_one_ptid;
}
sigsuspend (&suspend_mask);
}
}
+ else if (target_options & TARGET_WNOHANG)
+ {
+ /* No interesting event for PID yet. */
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n");
+
+ restore_child_signals_mask (&prev_mask);
+ return minus_one_ptid;
+ }
/* We shouldn't end up here unless we want to try again. */
- gdb_assert (status == 0);
+ gdb_assert (lp == NULL);
}
if (!target_can_async_p ())
- {
- clear_sigio_trap ();
- clear_sigint_trap ();
- }
+ clear_sigint_trap ();
gdb_assert (lp);
+ status = lp->status;
+ lp->status = 0;
+
/* Don't report signals that GDB isn't interested in, such as
signals that are neither printed nor stopped upon. Stopping all
threads can be a bit time-consuming so if we want decent
if (WIFSTOPPED (status))
{
- int signo = target_signal_from_host (WSTOPSIG (status));
+ enum target_signal signo = target_signal_from_host (WSTOPSIG (status));
struct inferior *inf;
inf = find_inferior_pid (ptid_get_pid (lp->ptid));
newly attached threads may cause an unwanted delay in
getting them running. */
registers_changed ();
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
lp->step, signo);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
lp->step ?
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
target_pid_to_str (lp->ptid),
- signo ? strsignal (signo) : "0");
+ (signo != TARGET_SIGNAL_0
+ ? strsignal (target_signal_to_host (signo))
+ : "0"));
lp->stopped = 0;
- status = 0;
goto retry;
}
will receive it - unless they're using CLONE_THREAD to
share signals. Since we only want to report it once, we
mark it as ignored for all LWPs except this one. */
- iterate_over_lwps (set_ignore_sigint, NULL);
+ iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)),
+ set_ignore_sigint, NULL);
lp->ignore_sigint = 0;
}
else
if (!non_stop)
{
/* Now stop all other LWP's ... */
- iterate_over_lwps (stop_callback, NULL);
+ iterate_over_lwps (minus_one_ptid, stop_callback, NULL);
/* ... and wait until all of them have reported back that
they're no longer running. */
- iterate_over_lwps (stop_wait_callback, NULL);
+ iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL);
/* If we're not waiting for a specific LWP, choose an event LWP
from among those that have had events. Giving equal priority
to all LWPs that have had events helps prevent
starvation. */
if (pid == -1)
- select_event_lwp (&lp, &status);
- }
+ select_event_lwp (ptid, &lp, &status);
+
+ /* Now that we've selected our final event LWP, cancel any
+ breakpoints in other LWPs that have hit a GDB breakpoint.
+ See the comment in cancel_breakpoints_callback to find out
+ why. */
+ iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp);
- /* Now that we've selected our final event LWP, cancel any
- breakpoints in other LWPs that have hit a GDB breakpoint. See
- the comment in cancel_breakpoints_callback to find out why. */
- iterate_over_lwps (cancel_breakpoints_callback, lp);
+ /* In all-stop, from the core's perspective, all LWPs are now
+ stopped until a new resume action is sent over. */
+ iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL);
+ }
+ else
+ lp->resumed = 0;
- if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
+ if (linux_nat_status_is_event (status))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
else
store_waitstatus (ourstatus, status);
- /* Get ready for the next event. */
- if (target_can_async_p ())
- target_async (inferior_event_handler, 0);
-
if (debug_linux_nat_async)
fprintf_unfiltered (gdb_stdlog, "LLW: exit\n");
+ restore_child_signals_mask (&prev_mask);
+
+ if (ourstatus->kind == TARGET_WAITKIND_EXITED
+ || ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
+ lp->core = -1;
+ else
+ lp->core = linux_nat_core_of_thread_1 (lp->ptid);
+
return lp->ptid;
}
+/* Resume LWPs that are currently stopped without any pending status
+ to report, but are resumed from the core's perspective. */
+
+static int
+resume_stopped_resumed_lwps (struct lwp_info *lp, void *data)
+{
+ ptid_t *wait_ptid_p = data;
+
+ if (lp->stopped
+ && lp->resumed
+ && lp->status == 0
+ && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE)
+ {
+ gdb_assert (is_executing (lp->ptid));
+
+ /* Don't bother if there's a breakpoint at PC that we'd hit
+ immediately, and we're not waiting for this LWP. */
+ if (!ptid_match (lp->ptid, *wait_ptid_p))
+ {
+ struct regcache *regcache = get_thread_regcache (lp->ptid);
+ CORE_ADDR pc = regcache_read_pc (regcache);
+
+ if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc))
+ return 0;
+ }
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RSRL: resuming stopped-resumed LWP %s\n",
+ target_pid_to_str (lp->ptid));
+
+ linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)),
+ lp->step, TARGET_SIGNAL_0);
+ lp->stopped = 0;
+ memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+ lp->stopped_by_watchpoint = 0;
+ }
+
+ return 0;
+}
+
+static ptid_t
+linux_nat_wait (struct target_ops *ops,
+ ptid_t ptid, struct target_waitstatus *ourstatus,
+ int target_options)
+{
+ ptid_t event_ptid;
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid));
+
+ /* Flush the async file first. */
+ if (target_can_async_p ())
+ async_file_flush ();
+
+ /* Resume LWPs that are currently stopped without any pending status
+ to report, but are resumed from the core's perspective. LWPs get
+ in this state if we find them stopping at a time we're not
+ interested in reporting the event (target_wait on a
+ specific_process, for example, see linux_nat_wait_1), and
+ meanwhile the event became uninteresting. Don't bother resuming
+ LWPs we're not going to wait for if they'd stop immediately. */
+ if (non_stop)
+ iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid);
+
+ event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options);
+
+ /* If we requested any event, and something came out, assume there
+ may be more. If we requested a specific lwp or process, also
+ assume there may be more. */
+ if (target_can_async_p ()
+ && (ourstatus->kind != TARGET_WAITKIND_IGNORE
+ || !ptid_equal (ptid, minus_one_ptid)))
+ async_file_mark ();
+
+ /* Get ready for the next event. */
+ if (target_can_async_p ())
+ target_async (inferior_event_handler, 0);
+
+ return event_ptid;
+}
+
static int
kill_callback (struct lwp_info *lp, void *data)
{
}
static void
-linux_nat_kill (void)
+linux_nat_kill (struct target_ops *ops)
{
struct target_waitstatus last;
ptid_t last_ptid;
int status;
- if (target_can_async_p ())
- target_async (NULL, 0);
-
/* If we're stopped while forking and we haven't followed yet,
kill the other task. We need to do this first because the
parent will be sleeping if this is a vfork. */
}
if (forks_exist_p ())
- {
- linux_fork_killall ();
- drain_queued_events (-1);
- }
+ linux_fork_killall ();
else
{
+ ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
+
/* Stop all threads before killing them, since ptrace requires
that the thread is stopped to sucessfully PTRACE_KILL. */
- iterate_over_lwps (stop_callback, NULL);
+ iterate_over_lwps (ptid, stop_callback, NULL);
/* ... and wait until all of them have reported back that
they're no longer running. */
- iterate_over_lwps (stop_wait_callback, NULL);
+ iterate_over_lwps (ptid, stop_wait_callback, NULL);
/* Kill all LWP's ... */
- iterate_over_lwps (kill_callback, NULL);
+ iterate_over_lwps (ptid, kill_callback, NULL);
/* ... and wait until we've flushed all events. */
- iterate_over_lwps (kill_wait_callback, NULL);
+ iterate_over_lwps (ptid, kill_wait_callback, NULL);
}
target_mourn_inferior ();
}
static void
-linux_nat_mourn_inferior (void)
+linux_nat_mourn_inferior (struct target_ops *ops)
{
- /* Destroy LWP info; it's no longer valid. */
- init_lwp_list ();
+ purge_lwp_list (ptid_get_pid (inferior_ptid));
if (! forks_exist_p ())
- {
- /* Normal case, no other forks available. */
- if (target_can_async_p ())
- linux_nat_async (NULL, 0);
- linux_ops->to_mourn_inferior ();
- }
+ /* Normal case, no other forks available. */
+ linux_ops->to_mourn_inferior (ops);
else
/* Multi-fork case. The current inferior_ptid has exited, but
there are other viable forks to debug. Delete the exiting
linux_fork_mourn_inferior ();
}
-static LONGEST
-linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
+/* Convert a native/host siginfo object, into/from the siginfo in the
+ layout of the inferiors' architecture. */
+
+static void
+siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction)
{
- struct cleanup *old_chain = save_inferior_ptid ();
- LONGEST xfer;
+ int done = 0;
+
+ if (linux_nat_siginfo_fixup != NULL)
+ done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction);
+
+ /* If there was no callback, or the callback didn't do anything,
+ then just do a straight memcpy. */
+ if (!done)
+ {
+ if (direction == 1)
+ memcpy (siginfo, inf_siginfo, sizeof (struct siginfo));
+ else
+ memcpy (inf_siginfo, siginfo, sizeof (struct siginfo));
+ }
+}
+
+static LONGEST
+linux_xfer_siginfo (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ int pid;
+ struct siginfo siginfo;
+ gdb_byte inf_siginfo[sizeof (struct siginfo)];
+
+ gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO);
+ gdb_assert (readbuf || writebuf);
+
+ pid = GET_LWP (inferior_ptid);
+ if (pid == 0)
+ pid = GET_PID (inferior_ptid);
+
+ if (offset > sizeof (siginfo))
+ return -1;
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ return -1;
+
+ /* When GDB is built as a 64-bit application, ptrace writes into
+ SIGINFO an object with 64-bit layout. Since debugging a 32-bit
+ inferior with a 64-bit GDB should look the same as debugging it
+ with a 32-bit GDB, we need to convert it. GDB core always sees
+ the converted layout, so any read/write will have to be done
+ post-conversion. */
+ siginfo_fixup (&siginfo, inf_siginfo, 0);
+
+ if (offset + len > sizeof (siginfo))
+ len = sizeof (siginfo) - offset;
+
+ if (readbuf != NULL)
+ memcpy (readbuf, inf_siginfo + offset, len);
+ else
+ {
+ memcpy (inf_siginfo + offset, writebuf, len);
+
+ /* Convert back to ptrace layout before flushing it out. */
+ siginfo_fixup (&siginfo, inf_siginfo, 1);
+
+ errno = 0;
+ ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ return -1;
+ }
+
+ return len;
+}
+
+static LONGEST
+linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
+{
+ struct cleanup *old_chain;
+ LONGEST xfer;
+
+ if (object == TARGET_OBJECT_SIGNAL_INFO)
+ return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
+ /* The target is connected but no live inferior is selected. Pass
+ this request down to a lower stratum (e.g., the executable
+ file). */
+ if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid))
+ return 0;
+
+ old_chain = save_inferior_ptid ();
if (is_lwp (inferior_ptid))
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
}
static int
-linux_nat_thread_alive (ptid_t ptid)
+linux_thread_alive (ptid_t ptid)
{
int err;
return 1;
}
+static int
+linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid)
+{
+ return linux_thread_alive (ptid);
+}
+
static char *
-linux_nat_pid_to_str (ptid_t ptid)
+linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
static char buf[64];
if (is_lwp (ptid)
- && ((lwp_list && lwp_list->next)
- || GET_PID (ptid) != GET_LWP (ptid)))
+ && (GET_PID (ptid) != GET_LWP (ptid)
+ || num_lwps (GET_PID (ptid)) > 1))
{
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
return buf;
return normal_pid_to_str (ptid);
}
-static void
-sigchld_handler (int signo)
-{
- if (target_async_permitted
- && linux_nat_async_events_state != sigchld_sync
- && signo == SIGCHLD)
- /* It is *always* a bug to hit this. */
- internal_error (__FILE__, __LINE__,
- "sigchld_handler called when async events are enabled");
-
- /* Do nothing. The only reason for this handler is that it allows
- us to use sigsuspend in linux_nat_wait above to wait for the
- arrival of a SIGCHLD. */
-}
-
/* Accepts an integer PID; Returns a string representing a file that
can be opened to get the symbols for the child process. */
regions in the inferior for a corefile. */
static int
-linux_nat_find_memory_regions (int (*func) (CORE_ADDR,
- unsigned long,
- int, int, int, void *), void *obfd)
+linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd)
{
- long long pid = PIDGET (inferior_ptid);
+ int pid = PIDGET (inferior_ptid);
char mapsfilename[MAXPATHLEN];
FILE *mapsfile;
long long addr, endaddr, size, offset, inode;
char permissions[8], device[8], filename[MAXPATHLEN];
int read, write, exec;
- int ret;
struct cleanup *cleanup;
/* Compose the filename for the /proc memory map, and open it. */
- sprintf (mapsfilename, "/proc/%lld/maps", pid);
+ sprintf (mapsfilename, "/proc/%d/maps", pid);
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
error (_("Could not open %s."), mapsfilename);
cleanup = make_cleanup_fclose (mapsfile);
if (info_verbose)
{
fprintf_filtered (gdb_stdout,
- "Save segment, %lld bytes at 0x%s (%c%c%c)",
- size, paddr_nz (addr),
+ "Save segment, %s bytes at %s (%c%c%c)",
+ plongest (size), paddress (target_gdbarch, addr),
read ? 'r' : ' ',
write ? 'w' : ' ', exec ? 'x' : ' ');
if (filename[0])
char *note_data, int *note_size,
enum target_signal stop_signal)
{
- gdb_gregset_t gregs;
- gdb_fpregset_t fpregs;
unsigned long lwp = ptid_get_lwp (ptid);
- struct regcache *regcache = get_thread_regcache (ptid);
- struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch *gdbarch = target_gdbarch;
+ struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch);
const struct regset *regset;
int core_regset_p;
struct cleanup *old_chain;
core_regset_p = gdbarch_regset_from_core_section_p (gdbarch);
sect_list = gdbarch_core_regset_sections (gdbarch);
- if (core_regset_p
- && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg",
- sizeof (gregs))) != NULL
- && regset->collect_regset != NULL)
- regset->collect_regset (regset, regcache, -1,
- &gregs, sizeof (gregs));
- else
- fill_gregset (regcache, &gregs, -1);
-
- note_data = (char *) elfcore_write_prstatus (obfd,
- note_data,
- note_size,
- lwp,
- stop_signal, &gregs);
-
/* The loop below uses the new struct core_regset_section, which stores
the supported section names and sizes for the core file. Note that
note PRSTATUS needs to be treated specially. But the other notes are
if (core_regset_p && sect_list != NULL)
while (sect_list->sect_name != NULL)
{
- /* .reg was already handled above. */
- if (strcmp (sect_list->sect_name, ".reg") == 0)
- {
- sect_list++;
- continue;
- }
regset = gdbarch_regset_from_core_section (gdbarch,
sect_list->sect_name,
sect_list->size);
gdb_regset = xmalloc (sect_list->size);
regset->collect_regset (regset, regcache, -1,
gdb_regset, sect_list->size);
- note_data = (char *) elfcore_write_register_note (obfd,
- note_data,
- note_size,
- sect_list->sect_name,
- gdb_regset,
- sect_list->size);
+
+ if (strcmp (sect_list->sect_name, ".reg") == 0)
+ note_data = (char *) elfcore_write_prstatus
+ (obfd, note_data, note_size,
+ lwp, target_signal_to_host (stop_signal),
+ gdb_regset);
+ else
+ note_data = (char *) elfcore_write_register_note
+ (obfd, note_data, note_size,
+ sect_list->sect_name, gdb_regset,
+ sect_list->size);
xfree (gdb_regset);
sect_list++;
}
the new support, the code below should be deleted. */
else
{
+ gdb_gregset_t gregs;
+ gdb_fpregset_t fpregs;
+
+ if (core_regset_p
+ && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg",
+ sizeof (gregs))) != NULL
+ && regset->collect_regset != NULL)
+ regset->collect_regset (regset, regcache, -1,
+ &gregs, sizeof (gregs));
+ else
+ fill_gregset (regcache, &gregs, -1);
+
+ note_data = (char *) elfcore_write_prstatus
+ (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal),
+ &gregs);
+
if (core_regset_p
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
sizeof (fpregs))) != NULL
return 0;
}
+/* Enumerate spufs IDs for process PID. */
+
+static void
+iterate_over_spus (int pid, void (*callback) (void *, int), void *data)
+{
+ char path[128];
+ DIR *dir;
+ struct dirent *entry;
+
+ xsnprintf (path, sizeof path, "/proc/%d/fd", pid);
+ dir = opendir (path);
+ if (!dir)
+ return;
+
+ rewinddir (dir);
+ while ((entry = readdir (dir)) != NULL)
+ {
+ struct stat st;
+ struct statfs stfs;
+ int fd;
+
+ fd = atoi (entry->d_name);
+ if (!fd)
+ continue;
+
+ xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd);
+ if (stat (path, &st) != 0)
+ continue;
+ if (!S_ISDIR (st.st_mode))
+ continue;
+
+ if (statfs (path, &stfs) != 0)
+ continue;
+ if (stfs.f_type != SPUFS_MAGIC)
+ continue;
+
+ callback (data, fd);
+ }
+
+ closedir (dir);
+}
+
+/* Generate corefile notes for SPU contexts. */
+
+struct linux_spu_corefile_data
+{
+ bfd *obfd;
+ char *note_data;
+ int *note_size;
+};
+
+static void
+linux_spu_corefile_callback (void *data, int fd)
+{
+ struct linux_spu_corefile_data *args = data;
+ int i;
+
+ static const char *spu_files[] =
+ {
+ "object-id",
+ "mem",
+ "regs",
+ "fpcr",
+ "lslr",
+ "decr",
+ "decr_status",
+ "signal1",
+ "signal1_type",
+ "signal2",
+ "signal2_type",
+ "event_mask",
+ "event_status",
+ "mbox_info",
+ "ibox_info",
+ "wbox_info",
+ "dma_info",
+ "proxydma_info",
+ };
+
+ for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++)
+ {
+ char annex[32], note_name[32];
+ gdb_byte *spu_data;
+ LONGEST spu_len;
+
+ xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]);
+ spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU,
+ annex, &spu_data);
+ if (spu_len > 0)
+ {
+ xsnprintf (note_name, sizeof note_name, "SPU/%s", annex);
+ args->note_data = elfcore_write_note (args->obfd, args->note_data,
+ args->note_size, note_name,
+ NT_SPU, spu_data, spu_len);
+ xfree (spu_data);
+ }
+ }
+}
+
+static char *
+linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size)
+{
+ struct linux_spu_corefile_data args;
+
+ args.obfd = obfd;
+ args.note_data = note_data;
+ args.note_size = note_size;
+
+ iterate_over_spus (PIDGET (inferior_ptid),
+ linux_spu_corefile_callback, &args);
+
+ return args.note_data;
+}
+
/* Fills the "to_make_corefile_note" target vector. Builds the note
section for a corefile, and returns it in a malloc buffer. */
linux_nat_make_corefile_notes (bfd *obfd, int *note_size)
{
struct linux_nat_corefile_thread_data thread_args;
- struct cleanup *old_chain;
/* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
char fname[16] = { '\0' };
/* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
char psargs[80] = { '\0' };
char *note_data = NULL;
- ptid_t current_ptid = inferior_ptid;
+ ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid));
gdb_byte *auxv;
int auxv_len;
thread_args.note_size = note_size;
thread_args.num_notes = 0;
thread_args.stop_signal = find_stop_signal ();
- iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args);
+ iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args);
gdb_assert (thread_args.num_notes != 0);
note_data = thread_args.note_data;
xfree (auxv);
}
+ note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size);
+
make_cleanup (xfree, note_data);
return note_data;
}
static void
linux_nat_info_proc_cmd (char *args, int from_tty)
{
- long long pid = PIDGET (inferior_ptid);
+ /* A long is used for pid instead of an int to avoid a loss of precision
+ compiler warning from the output of strtoul. */
+ long pid = PIDGET (inferior_ptid);
FILE *procfile;
char **argv = NULL;
char buffer[MAXPATHLEN];
int cwd_f = 1;
int exe_f = 1;
int mappings_f = 0;
- int environ_f = 0;
int status_f = 0;
int stat_f = 0;
int all = 0;
if (pid == 0)
error (_("No current process: you must name one."));
- sprintf (fname1, "/proc/%lld", pid);
+ sprintf (fname1, "/proc/%ld", pid);
if (stat (fname1, &dummy) != 0)
error (_("No /proc directory: '%s'"), fname1);
- printf_filtered (_("process %lld\n"), pid);
+ printf_filtered (_("process %ld\n"), pid);
if (cmdline_f || all)
{
- sprintf (fname1, "/proc/%lld/cmdline", pid);
+ sprintf (fname1, "/proc/%ld/cmdline", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
struct cleanup *cleanup = make_cleanup_fclose (procfile);
- fgets (buffer, sizeof (buffer), procfile);
- printf_filtered ("cmdline = '%s'\n", buffer);
+
+ if (fgets (buffer, sizeof (buffer), procfile))
+ printf_filtered ("cmdline = '%s'\n", buffer);
+ else
+ warning (_("unable to read '%s'"), fname1);
do_cleanups (cleanup);
}
else
}
if (cwd_f || all)
{
- sprintf (fname1, "/proc/%lld/cwd", pid);
+ sprintf (fname1, "/proc/%ld/cwd", pid);
memset (fname2, 0, sizeof (fname2));
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("cwd = '%s'\n", fname2);
}
if (exe_f || all)
{
- sprintf (fname1, "/proc/%lld/exe", pid);
+ sprintf (fname1, "/proc/%ld/exe", pid);
memset (fname2, 0, sizeof (fname2));
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
printf_filtered ("exe = '%s'\n", fname2);
}
if (mappings_f || all)
{
- sprintf (fname1, "/proc/%lld/maps", pid);
+ sprintf (fname1, "/proc/%ld/maps", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
long long addr, endaddr, size, offset, inode;
cleanup = make_cleanup_fclose (procfile);
printf_filtered (_("Mapped address spaces:\n\n"));
- if (gdbarch_addr_bit (current_gdbarch) == 32)
+ if (gdbarch_addr_bit (target_gdbarch) == 32)
{
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
"Start Addr",
a generic local_address_string instead to print out
the addresses; that makes sense to me, too. */
- if (gdbarch_addr_bit (current_gdbarch) == 32)
+ if (gdbarch_addr_bit (target_gdbarch) == 32)
{
printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
(unsigned long) addr, /* FIXME: pr_addr */
}
if (status_f || all)
{
- sprintf (fname1, "/proc/%lld/status", pid);
+ sprintf (fname1, "/proc/%ld/status", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
struct cleanup *cleanup = make_cleanup_fclose (procfile);
+
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
puts_filtered (buffer);
do_cleanups (cleanup);
}
if (stat_f || all)
{
- sprintf (fname1, "/proc/%lld/stat", pid);
+ sprintf (fname1, "/proc/%ld/stat", pid);
if ((procfile = fopen (fname1, "r")) != NULL)
{
int itmp;
return ret;
}
+
+/* Enumerate spufs IDs for process PID. */
+static LONGEST
+spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len)
+{
+ enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);
+ LONGEST pos = 0;
+ LONGEST written = 0;
+ char path[128];
+ DIR *dir;
+ struct dirent *entry;
+
+ xsnprintf (path, sizeof path, "/proc/%d/fd", pid);
+ dir = opendir (path);
+ if (!dir)
+ return -1;
+
+ rewinddir (dir);
+ while ((entry = readdir (dir)) != NULL)
+ {
+ struct stat st;
+ struct statfs stfs;
+ int fd;
+
+ fd = atoi (entry->d_name);
+ if (!fd)
+ continue;
+
+ xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd);
+ if (stat (path, &st) != 0)
+ continue;
+ if (!S_ISDIR (st.st_mode))
+ continue;
+
+ if (statfs (path, &stfs) != 0)
+ continue;
+ if (stfs.f_type != SPUFS_MAGIC)
+ continue;
+
+ if (pos >= offset && pos + 4 <= offset + len)
+ {
+ store_unsigned_integer (buf + pos - offset, 4, byte_order, fd);
+ written += 4;
+ }
+ pos += 4;
+ }
+
+ closedir (dir);
+ return written;
+}
+
+/* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
+ object type, using the /proc file system. */
+static LONGEST
+linux_proc_xfer_spu (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len)
+{
+ char buf[128];
+ int fd = 0;
+ int ret = -1;
+ int pid = PIDGET (inferior_ptid);
+
+ if (!annex)
+ {
+ if (!readbuf)
+ return -1;
+ else
+ return spu_enumerate_spu_ids (pid, readbuf, offset, len);
+ }
+
+ xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex);
+ fd = open (buf, writebuf? O_WRONLY : O_RDONLY);
+ if (fd <= 0)
+ return -1;
+
+ if (offset != 0
+ && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
+ {
+ close (fd);
+ return 0;
+ }
+
+ if (writebuf)
+ ret = write (fd, writebuf, (size_t) len);
+ else if (readbuf)
+ ret = read (fd, readbuf, (size_t) len);
+
+ close (fd);
+ return ret;
+}
+
+
/* Parse LINE as a signal set and add its set bits to SIGS. */
static void
{
FILE *procfile;
char buffer[MAXPATHLEN], fname[MAXPATHLEN];
- int signum;
struct cleanup *cleanup;
sigemptyset (pending);
do_cleanups (cleanup);
}
+static LONGEST
+linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+{
+ /* We make the process list snapshot when the object starts to be
+ read. */
+ static const char *buf;
+ static LONGEST len_avail = -1;
+ static struct obstack obstack;
+
+ DIR *dirp;
+
+ gdb_assert (object == TARGET_OBJECT_OSDATA);
+
+ if (!annex)
+ {
+ if (offset == 0)
+ {
+ if (len_avail != -1 && len_avail != 0)
+ obstack_free (&obstack, NULL);
+ len_avail = 0;
+ buf = NULL;
+ obstack_init (&obstack);
+ obstack_grow_str (&obstack, "<osdata type=\"types\">\n");
+
+ obstack_xml_printf (
+ &obstack,
+ "<item>"
+ "<column name=\"Type\">processes</column>"
+ "<column name=\"Description\">Listing of all processes</column>"
+ "</item>");
+
+ obstack_grow_str0 (&obstack, "</osdata>\n");
+ buf = obstack_finish (&obstack);
+ len_avail = strlen (buf);
+ }
+
+ if (offset >= len_avail)
+ {
+ /* Done. Get rid of the obstack. */
+ obstack_free (&obstack, NULL);
+ buf = NULL;
+ len_avail = 0;
+ return 0;
+ }
+
+ if (len > len_avail - offset)
+ len = len_avail - offset;
+ memcpy (readbuf, buf + offset, len);
+
+ return len;
+ }
+
+ if (strcmp (annex, "processes") != 0)
+ return 0;
+
+ gdb_assert (readbuf && !writebuf);
+
+ if (offset == 0)
+ {
+ if (len_avail != -1 && len_avail != 0)
+ obstack_free (&obstack, NULL);
+ len_avail = 0;
+ buf = NULL;
+ obstack_init (&obstack);
+ obstack_grow_str (&obstack, "<osdata type=\"processes\">\n");
+
+ dirp = opendir ("/proc");
+ if (dirp)
+ {
+ struct dirent *dp;
+
+ while ((dp = readdir (dirp)) != NULL)
+ {
+ struct stat statbuf;
+ char procentry[sizeof ("/proc/4294967295")];
+
+ if (!isdigit (dp->d_name[0])
+ || NAMELEN (dp) > sizeof ("4294967295") - 1)
+ continue;
+
+ sprintf (procentry, "/proc/%s", dp->d_name);
+ if (stat (procentry, &statbuf) == 0
+ && S_ISDIR (statbuf.st_mode))
+ {
+ char *pathname;
+ FILE *f;
+ char cmd[MAXPATHLEN + 1];
+ struct passwd *entry;
+
+ pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name);
+ entry = getpwuid (statbuf.st_uid);
+
+ if ((f = fopen (pathname, "r")) != NULL)
+ {
+ size_t len = fread (cmd, 1, sizeof (cmd) - 1, f);
+
+ if (len > 0)
+ {
+ int i;
+
+ for (i = 0; i < len; i++)
+ if (cmd[i] == '\0')
+ cmd[i] = ' ';
+ cmd[len] = '\0';
+
+ obstack_xml_printf (
+ &obstack,
+ "<item>"
+ "<column name=\"pid\">%s</column>"
+ "<column name=\"user\">%s</column>"
+ "<column name=\"command\">%s</column>"
+ "</item>",
+ dp->d_name,
+ entry ? entry->pw_name : "?",
+ cmd);
+ }
+ fclose (f);
+ }
+
+ xfree (pathname);
+ }
+ }
+
+ closedir (dirp);
+ }
+
+ obstack_grow_str0 (&obstack, "</osdata>\n");
+ buf = obstack_finish (&obstack);
+ len_avail = strlen (buf);
+ }
+
+ if (offset >= len_avail)
+ {
+ /* Done. Get rid of the obstack. */
+ obstack_free (&obstack, NULL);
+ buf = NULL;
+ len_avail = 0;
+ return 0;
+ }
+
+ if (len > len_avail - offset)
+ len = len_avail - offset;
+ memcpy (readbuf, buf + offset, len);
+
+ return len;
+}
+
static LONGEST
linux_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
LONGEST xfer;
if (object == TARGET_OBJECT_AUXV)
- return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
+ return memory_xfer_auxv (ops, object, annex, readbuf, writebuf,
offset, len);
+ if (object == TARGET_OBJECT_OSDATA)
+ return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
+ if (object == TARGET_OBJECT_SPU)
+ return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf,
+ offset, len);
+
+ /* GDB calculates all the addresses in possibly larget width of the address.
+ Address width needs to be masked before its final use - either by
+ linux_proc_xfer_partial or inf_ptrace_xfer_partial.
+
+ Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */
+
+ if (object == TARGET_OBJECT_MEMORY)
+ {
+ int addr_bit = gdbarch_addr_bit (target_gdbarch);
+
+ if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT))
+ offset &= ((ULONGEST) 1 << addr_bit) - 1;
+ }
+
xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
offset, len);
if (xfer != 0)
t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint;
t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint;
t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint;
+ t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint;
t->to_pid_to_exec_file = linux_child_pid_to_exec_file;
t->to_post_startup_inferior = linux_child_post_startup_inferior;
t->to_post_attach = linux_child_post_attach;
linux_nat_is_async_p (void)
{
/* NOTE: palves 2008-03-21: We're only async when the user requests
- it explicitly with the "maintenance set target-async" command.
+ it explicitly with the "set target-async" command.
Someday, linux will always be async. */
if (!target_async_permitted)
return 0;
- return 1;
+ /* See target.h/target_async_mask. */
+ return linux_nat_async_mask_value;
}
/* target_can_async_p implementation. */
linux_nat_can_async_p (void)
{
/* NOTE: palves 2008-03-21: We're only async when the user requests
- it explicitly with the "maintenance set target-async" command.
+ it explicitly with the "set target-async" command.
Someday, linux will always be async. */
if (!target_async_permitted)
return 0;
return 1;
}
-/* target_async_mask implementation. */
-
-static int
-linux_nat_async_mask (int mask)
-{
- int current_state;
- current_state = linux_nat_async_mask_value;
-
- if (current_state != mask)
- {
- if (mask == 0)
- {
- linux_nat_async (NULL, 0);
- linux_nat_async_mask_value = mask;
- }
- else
- {
- linux_nat_async_mask_value = mask;
- linux_nat_async (inferior_event_handler, 0);
- }
- }
-
- return current_state;
-}
+/* True if we want to support multi-process. To be removed when GDB
+ supports multi-exec. */
-/* Pop an event from the event pipe. */
+int linux_multi_process = 1;
static int
-linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options)
+linux_nat_supports_multi_process (void)
{
- struct waitpid_result event = {0};
- int ret;
-
- do
- {
- ret = read (linux_nat_event_pipe[0], &event, sizeof (event));
- }
- while (ret == -1 && errno == EINTR);
-
- gdb_assert (ret == sizeof (event));
-
- *ptr_status = event.status;
- *ptr_options = event.options;
-
- linux_nat_num_queued_events--;
-
- return event.pid;
+ return linux_multi_process;
}
-/* Push an event into the event pipe. */
-
-static void
-linux_nat_event_pipe_push (int pid, int status, int options)
-{
- int ret;
- struct waitpid_result event = {0};
- event.pid = pid;
- event.status = status;
- event.options = options;
-
- do
- {
- ret = write (linux_nat_event_pipe[1], &event, sizeof (event));
- gdb_assert ((ret == -1 && errno == EINTR) || ret == sizeof (event));
- } while (ret == -1 && errno == EINTR);
-
- linux_nat_num_queued_events++;
-}
+/* target_async_mask implementation. */
-static void
-get_pending_events (void)
+static int
+linux_nat_async_mask (int new_mask)
{
- int status, options, pid;
-
- if (!target_async_permitted
- || linux_nat_async_events_state != sigchld_async)
- internal_error (__FILE__, __LINE__,
- "get_pending_events called with async masked");
+ int curr_mask = linux_nat_async_mask_value;
- while (1)
+ if (curr_mask != new_mask)
{
- status = 0;
- options = __WCLONE | WNOHANG;
-
- do
- {
- pid = waitpid (-1, &status, options);
- }
- while (pid == -1 && errno == EINTR);
-
- if (pid <= 0)
+ if (new_mask == 0)
{
- options = WNOHANG;
- do
- {
- pid = waitpid (-1, &status, options);
- }
- while (pid == -1 && errno == EINTR);
+ linux_nat_async (NULL, 0);
+ linux_nat_async_mask_value = new_mask;
}
-
- if (pid <= 0)
- /* No more children reporting events. */
- break;
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "\
-get_pending_events: pid(%d), status(%x), options (%x)\n",
- pid, status, options);
-
- linux_nat_event_pipe_push (pid, status, options);
- }
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "\
-get_pending_events: linux_nat_num_queued_events(%d)\n",
- linux_nat_num_queued_events);
-}
-
-/* SIGCHLD handler for async mode. */
-
-static void
-async_sigchld_handler (int signo)
-{
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "async_sigchld_handler\n");
-
- get_pending_events ();
-}
-
-/* Set SIGCHLD handling state to STATE. Returns previous state. */
-
-static enum sigchld_state
-linux_nat_async_events (enum sigchld_state state)
-{
- enum sigchld_state current_state = linux_nat_async_events_state;
-
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog,
- "LNAE: state(%d): linux_nat_async_events_state(%d), "
- "linux_nat_num_queued_events(%d)\n",
- state, linux_nat_async_events_state,
- linux_nat_num_queued_events);
-
- if (current_state != state)
- {
- sigset_t mask;
- sigemptyset (&mask);
- sigaddset (&mask, SIGCHLD);
-
- /* Always block before changing state. */
- sigprocmask (SIG_BLOCK, &mask, NULL);
-
- /* Set new state. */
- linux_nat_async_events_state = state;
-
- switch (state)
+ else
{
- case sigchld_sync:
- {
- /* Block target events. */
- sigprocmask (SIG_BLOCK, &mask, NULL);
- sigaction (SIGCHLD, &sync_sigchld_action, NULL);
- /* Get events out of queue, and make them available to
- queued_waitpid / my_waitpid. */
- pipe_to_local_event_queue ();
- }
- break;
- case sigchld_async:
- {
- /* Unblock target events for async mode. */
-
- sigprocmask (SIG_BLOCK, &mask, NULL);
+ linux_nat_async_mask_value = new_mask;
- /* Put events we already waited on, in the pipe first, so
- events are FIFO. */
- local_event_queue_to_pipe ();
- /* While in masked async, we may have not collected all
- the pending events. Get them out now. */
- get_pending_events ();
-
- /* Let'em come. */
- sigaction (SIGCHLD, &async_sigchld_action, NULL);
- sigprocmask (SIG_UNBLOCK, &mask, NULL);
- }
- break;
- case sigchld_default:
- {
- /* SIGCHLD default mode. */
- sigaction (SIGCHLD, &sigchld_default_action, NULL);
-
- /* Get events out of queue, and make them available to
- queued_waitpid / my_waitpid. */
- pipe_to_local_event_queue ();
-
- /* Unblock SIGCHLD. */
- sigprocmask (SIG_UNBLOCK, &mask, NULL);
- }
- break;
+ /* If we're going out of async-mask in all-stop, then the
+ inferior is stopped. The next resume will call
+ target_async. In non-stop, the target event source
+ should be always registered in the event loop. Do so
+ now. */
+ if (non_stop)
+ linux_nat_async (inferior_event_handler, 0);
}
}
- return current_state;
+ return curr_mask;
}
static int async_terminal_is_ours = 1;
return;
}
- /* GDB should never give the terminal to the inferior, if the
- inferior is running in the background (run&, continue&, etc.).
- This check can be removed when the common code is fixed. */
- if (!sync_execution)
- return;
-
terminal_inferior ();
+ /* Calls to target_terminal_*() are meant to be idempotent. */
if (!async_terminal_is_ours)
return;
/* target_terminal_ours implementation. */
-void
+static void
linux_nat_terminal_ours (void)
{
if (!target_is_async_p ())
but claiming it sure should. */
terminal_ours ();
- if (!sync_execution)
- return;
-
if (async_terminal_is_ours)
return;
void *context);
static void *async_client_context;
+/* SIGCHLD handler that serves two purposes: In non-stop/async mode,
+ so we notice when any child changes state, and notify the
+ event-loop; it allows us to use sigsuspend in linux_nat_wait_1
+ above to wait for the arrival of a SIGCHLD. */
+
+static void
+sigchld_handler (int signo)
+{
+ int old_errno = errno;
+
+ if (debug_linux_nat_async)
+ fprintf_unfiltered (gdb_stdlog, "sigchld\n");
+
+ if (signo == SIGCHLD
+ && linux_nat_event_pipe[0] != -1)
+ async_file_mark (); /* Let the event loop know that there are
+ events to handle. */
+
+ errno = old_errno;
+}
+
+/* Callback registered with the target events file descriptor. */
+
static void
-linux_nat_async_file_handler (int error, gdb_client_data client_data)
+handle_target_event (int error, gdb_client_data client_data)
{
- async_client_callback (INF_REG_EVENT, async_client_context);
+ (*async_client_callback) (INF_REG_EVENT, async_client_context);
+}
+
+/* Create/destroy the target events pipe. Returns previous state. */
+
+static int
+linux_async_pipe (int enable)
+{
+ int previous = (linux_nat_event_pipe[0] != -1);
+
+ if (previous != enable)
+ {
+ sigset_t prev_mask;
+
+ block_child_signals (&prev_mask);
+
+ if (enable)
+ {
+ if (pipe (linux_nat_event_pipe) == -1)
+ internal_error (__FILE__, __LINE__,
+ "creating event pipe failed.");
+
+ fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK);
+ fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK);
+ }
+ else
+ {
+ close (linux_nat_event_pipe[0]);
+ close (linux_nat_event_pipe[1]);
+ linux_nat_event_pipe[0] = -1;
+ linux_nat_event_pipe[1] = -1;
+ }
+
+ restore_child_signals_mask (&prev_mask);
+ }
+
+ return previous;
}
/* target_async implementation. */
{
async_client_callback = callback;
async_client_context = context;
- add_file_handler (linux_nat_event_pipe[0],
- linux_nat_async_file_handler, NULL);
-
- linux_nat_async_events (sigchld_async);
+ if (!linux_async_pipe (1))
+ {
+ add_file_handler (linux_nat_event_pipe[0],
+ handle_target_event, NULL);
+ /* There may be pending events to handle. Tell the event loop
+ to poll them. */
+ async_file_mark ();
+ }
}
else
{
async_client_callback = callback;
async_client_context = context;
-
- linux_nat_async_events (sigchld_sync);
delete_file_handler (linux_nat_event_pipe[0]);
+ linux_async_pipe (0);
}
return;
}
static int
linux_nat_stop_lwp (struct lwp_info *lwp, void *data)
{
- ptid_t ptid = * (ptid_t *) data;
-
- if (ptid_equal (lwp->ptid, ptid)
- || ptid_equal (minus_one_ptid, ptid)
- || (ptid_is_pid (ptid)
- && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid)))
+ if (!lwp->stopped)
{
- if (!lwp->stopped)
- {
- int pid, status;
+ ptid_t ptid = lwp->ptid;
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LNSL: running -> suspending %s\n",
- target_pid_to_str (lwp->ptid));
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNSL: running -> suspending %s\n",
+ target_pid_to_str (lwp->ptid));
- /* Peek once, to check if we've already waited for this
- LWP. */
- pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
- lwp->cloned ? __WCLONE : 0, 1 /* peek */);
- if (pid == -1)
- {
- ptid_t ptid = lwp->ptid;
+ stop_callback (lwp, NULL);
+ stop_wait_callback (lwp, NULL);
- stop_callback (lwp, NULL);
- stop_wait_callback (lwp, NULL);
-
- /* If the lwp exits while we try to stop it, there's
- nothing else to do. */
- lwp = find_lwp_pid (ptid);
- if (lwp == NULL)
- return 0;
+ /* If the lwp exits while we try to stop it, there's nothing
+ else to do. */
+ lwp = find_lwp_pid (ptid);
+ if (lwp == NULL)
+ return 0;
- pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status,
- lwp->cloned ? __WCLONE : 0,
- 1 /* peek */);
- }
+ /* If we didn't collect any signal other than SIGSTOP while
+ stopping the LWP, push a SIGNAL_0 event. In either case, the
+ event-loop will end up calling target_wait which will collect
+ these. */
+ if (lwp->status == 0)
+ lwp->status = W_STOPCODE (0);
+ async_file_mark ();
+ }
+ else
+ {
+ /* Already known to be stopped; do nothing. */
- /* If we didn't collect any signal other than SIGSTOP while
- stopping the LWP, push a SIGNAL_0 event. In either case,
- the event-loop will end up calling target_wait which will
- collect these. */
- if (pid == -1)
- push_waitpid (ptid_get_lwp (lwp->ptid), W_STOPCODE (0),
- lwp->cloned ? __WCLONE : 0);
- }
- else
+ if (debug_linux_nat)
{
- /* Already known to be stopped; do nothing. */
-
- if (debug_linux_nat)
- {
- if (find_thread_pid (lwp->ptid)->stop_requested)
- fprintf_unfiltered (gdb_stdlog, "\
+ if (find_thread_ptid (lwp->ptid)->stop_requested)
+ fprintf_unfiltered (gdb_stdlog, "\
LNSL: already stopped/stop_requested %s\n",
- target_pid_to_str (lwp->ptid));
- else
- fprintf_unfiltered (gdb_stdlog, "\
+ target_pid_to_str (lwp->ptid));
+ else
+ fprintf_unfiltered (gdb_stdlog, "\
LNSL: already stopped/no stop_requested yet %s\n",
- target_pid_to_str (lwp->ptid));
- }
+ target_pid_to_str (lwp->ptid));
}
}
return 0;
linux_nat_stop (ptid_t ptid)
{
if (non_stop)
+ iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL);
+ else
+ linux_ops->to_stop (ptid);
+}
+
+static void
+linux_nat_close (int quitting)
+{
+ /* Unregister from the event loop. */
+ if (target_is_async_p ())
+ target_async (NULL, 0);
+
+ /* Reset the async_masking. */
+ linux_nat_async_mask_value = 1;
+
+ if (linux_ops->to_close)
+ linux_ops->to_close (quitting);
+}
+
+/* When requests are passed down from the linux-nat layer to the
+ single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are
+ used. The address space pointer is stored in the inferior object,
+ but the common code that is passed such ptid can't tell whether
+ lwpid is a "main" process id or not (it assumes so). We reverse
+ look up the "main" process id from the lwp here. */
+
+struct address_space *
+linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid)
+{
+ struct lwp_info *lwp;
+ struct inferior *inf;
+ int pid;
+
+ pid = GET_LWP (ptid);
+ if (GET_LWP (ptid) == 0)
{
- linux_nat_async_events (sigchld_sync);
- iterate_over_lwps (linux_nat_stop_lwp, &ptid);
- target_async (inferior_event_handler, 0);
+ /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
+ tgid. */
+ lwp = find_lwp_pid (ptid);
+ pid = GET_PID (lwp->ptid);
}
else
- linux_ops->to_stop (ptid);
+ {
+ /* A (pid,lwpid,0) ptid. */
+ pid = GET_PID (ptid);
+ }
+
+ inf = find_inferior_pid (pid);
+ gdb_assert (inf != NULL);
+ return inf->aspace;
+}
+
+int
+linux_nat_core_of_thread_1 (ptid_t ptid)
+{
+ struct cleanup *back_to;
+ char *filename;
+ FILE *f;
+ char *content = NULL;
+ char *p;
+ char *ts = 0;
+ int content_read = 0;
+ int i;
+ int core;
+
+ filename = xstrprintf ("/proc/%d/task/%ld/stat",
+ GET_PID (ptid), GET_LWP (ptid));
+ back_to = make_cleanup (xfree, filename);
+
+ f = fopen (filename, "r");
+ if (!f)
+ {
+ do_cleanups (back_to);
+ return -1;
+ }
+
+ make_cleanup_fclose (f);
+
+ for (;;)
+ {
+ int n;
+
+ content = xrealloc (content, content_read + 1024);
+ n = fread (content + content_read, 1, 1024, f);
+ content_read += n;
+ if (n < 1024)
+ {
+ content[content_read] = '\0';
+ break;
+ }
+ }
+
+ make_cleanup (xfree, content);
+
+ p = strchr (content, '(');
+
+ /* Skip ")". */
+ if (p != NULL)
+ p = strchr (p, ')');
+ if (p != NULL)
+ p++;
+
+ /* If the first field after program name has index 0, then core number is
+ the field with index 36. There's no constant for that anywhere. */
+ if (p != NULL)
+ p = strtok_r (p, " ", &ts);
+ for (i = 0; p != NULL && i != 36; ++i)
+ p = strtok_r (NULL, " ", &ts);
+
+ if (p == NULL || sscanf (p, "%d", &core) == 0)
+ core = -1;
+
+ do_cleanups (back_to);
+
+ return core;
+}
+
+/* Return the cached value of the processor core for thread PTID. */
+
+int
+linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid)
+{
+ struct lwp_info *info = find_lwp_pid (ptid);
+
+ if (info)
+ return info->core;
+ return -1;
}
void
t->to_thread_alive = linux_nat_thread_alive;
t->to_pid_to_str = linux_nat_pid_to_str;
t->to_has_thread_control = tc_schedlock;
+ t->to_thread_address_space = linux_nat_thread_address_space;
+ t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint;
+ t->to_stopped_data_address = linux_nat_stopped_data_address;
t->to_can_async_p = linux_nat_can_async_p;
t->to_is_async_p = linux_nat_is_async_p;
t->to_async_mask = linux_nat_async_mask;
t->to_terminal_inferior = linux_nat_terminal_inferior;
t->to_terminal_ours = linux_nat_terminal_ours;
+ t->to_close = linux_nat_close;
/* Methods for non-stop support. */
t->to_stop = linux_nat_stop;
+ t->to_supports_multi_process = linux_nat_supports_multi_process;
+
+ t->to_core_of_thread = linux_nat_core_of_thread;
+
/* We don't change the stratum; this target will sit at
process_stratum and thread_db will set at thread_stratum. This
is a little strange, since this is a multi-threaded-capable
also want to be used for single-threaded processes. */
add_target (t);
-
- /* TODO: Eliminate this and have libthread_db use
- find_target_beneath. */
- thread_db_init (t);
}
/* Register a method to call whenever a new thread is attached. */
linux_nat_new_thread = new_thread;
}
+/* Register a method that converts a siginfo object between the layout
+ that ptrace returns, and the layout in the architecture of the
+ inferior. */
+void
+linux_nat_set_siginfo_fixup (struct target_ops *t,
+ int (*siginfo_fixup) (struct siginfo *,
+ gdb_byte *,
+ int))
+{
+ /* Save the pointer. */
+ linux_nat_siginfo_fixup = siginfo_fixup;
+}
+
/* Return the saved siginfo associated with PTID. */
struct siginfo *
linux_nat_get_siginfo (ptid_t ptid)
return &lp->siginfo;
}
-/* Enable/Disable async mode. */
-
-static void
-linux_nat_setup_async (void)
-{
- if (pipe (linux_nat_event_pipe) == -1)
- internal_error (__FILE__, __LINE__,
- "creating event pipe failed.");
- fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK);
- fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK);
-}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_linux_nat;
void
_initialize_linux_nat (void)
{
- sigset_t mask;
-
add_info ("proc", linux_nat_info_proc_cmd, _("\
Show /proc process information about any running process.\n\
Specify any process id, or use the program being debugged by default.\n\
show_debug_linux_nat_async,
&setdebuglist, &showdebuglist);
- /* Get the default SIGCHLD action. Used while forking an inferior
- (see linux_nat_create_inferior/linux_nat_async_events). */
- sigaction (SIGCHLD, NULL, &sigchld_default_action);
-
- /* Block SIGCHLD by default. Doing this early prevents it getting
- unblocked if an exception is thrown due to an error while the
- inferior is starting (sigsetjmp/siglongjmp). */
- sigemptyset (&mask);
- sigaddset (&mask, SIGCHLD);
- sigprocmask (SIG_BLOCK, &mask, NULL);
-
/* Save this mask as the default. */
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
- /* The synchronous SIGCHLD handler. */
- sync_sigchld_action.sa_handler = sigchld_handler;
- sigemptyset (&sync_sigchld_action.sa_mask);
- sync_sigchld_action.sa_flags = SA_RESTART;
+ /* Install a SIGCHLD handler. */
+ sigchld_action.sa_handler = sigchld_handler;
+ sigemptyset (&sigchld_action.sa_mask);
+ sigchld_action.sa_flags = SA_RESTART;
/* Make it the default. */
- sigaction (SIGCHLD, &sync_sigchld_action, NULL);
+ sigaction (SIGCHLD, &sigchld_action, NULL);
/* Make sure we don't block SIGCHLD during a sigsuspend. */
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
sigdelset (&suspend_mask, SIGCHLD);
- /* SIGCHLD handler for async mode. */
- async_sigchld_action.sa_handler = async_sigchld_handler;
- sigemptyset (&async_sigchld_action.sa_mask);
- async_sigchld_action.sa_flags = SA_RESTART;
-
- linux_nat_setup_async ();
+ sigemptyset (&blocked_mask);
add_setshow_boolean_cmd ("disable-randomization", class_support,
&disable_randomization, _("\
{
struct sigaction action;
int restart, cancel;
- sigset_t blocked_mask;
sigemptyset (&blocked_mask);
sigemptyset (set);