/* GNU/Linux native-dependent code common to multiple platforms.
- Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2014 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "inferior.h"
#include "target.h"
-#include "gdb_string.h"
+#include "nat/linux-nat.h"
+#include "nat/linux-waitpid.h"
+#include <string.h>
#include "gdb_wait.h"
#include "gdb_assert.h"
#ifdef HAVE_TKILL_SYSCALL
#endif
#include <sys/ptrace.h>
#include "linux-nat.h"
+#include "linux-ptrace.h"
+#include "linux-procfs.h"
#include "linux-fork.h"
#include "gdbthread.h"
#include "gdbcmd.h"
#include "regcache.h"
#include "regset.h"
+#include "inf-child.h"
#include "inf-ptrace.h"
#include "auxv.h"
-#include <sys/param.h> /* for MAXPATHLEN */
-#include <sys/procfs.h> /* for elf_gregset etc. */
+#include <sys/procfs.h> /* for elf_gregset etc. */
#include "elf-bfd.h" /* for elfcore_write_* */
#include "gregset.h" /* for gregset */
#include "gdbcore.h" /* for get_exec_file */
#include <ctype.h> /* for isdigit */
-#include "gdbthread.h" /* for struct thread_info etc. */
-#include "gdb_stat.h" /* for struct stat */
+#include <sys/stat.h> /* for struct stat */
#include <fcntl.h> /* for O_RDONLY */
#include "inf-loop.h"
#include "event-loop.h"
#include "event-top.h"
+#include <pwd.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include "xml-support.h"
+#include "terminal.h"
+#include <sys/vfs.h>
+#include "solib.h"
+#include "linux-osdata.h"
+#include "linux-tdep.h"
+#include "symfile.h"
+#include "agent.h"
+#include "tracepoint.h"
+#include "exceptions.h"
+#include "buffer.h"
+#include "target-descriptions.h"
+#include "filestuff.h"
+
+#ifndef SPUFS_MAGIC
+#define SPUFS_MAGIC 0x23c9b64e
+#endif
+
+#ifdef HAVE_PERSONALITY
+# include <sys/personality.h>
+# if !HAVE_DECL_ADDR_NO_RANDOMIZE
+# define ADDR_NO_RANDOMIZE 0x0040000
+# endif
+#endif /* HAVE_PERSONALITY */
-/* This comment documents high-level logic of this file.
+/* This comment documents high-level logic of this file.
Waiting for events in sync mode
===============================
When waiting for an event in a specific thread, we just use waitpid, passing
the specific pid, and not passing WNOHANG.
-When waiting for an event in all threads, waitpid is not quite good. Prior to
+When waiting for an event in all threads, waitpid is not quite good. Prior to
version 2.4, Linux can either wait for event in main thread, or in secondary
-threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
+threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might
miss an event. The solution is to use non-blocking waitpid, together with
sigsuspend. First, we use non-blocking waitpid to get an event in the main
-process, if any. Second, we use non-blocking waitpid with the __WCLONED
+process, if any. Second, we use non-blocking waitpid with the __WCLONED
flag to check for events in cloned processes. If nothing is found, we use
sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something
happened to a child process -- and SIGCHLD will be delivered both for events
in main debugged process and in cloned processes. As soon as we know there's
-an event, we get back to calling nonblocking waitpid with and without __WCLONED.
+an event, we get back to calling nonblocking waitpid with and without
+__WCLONED.
Note that SIGCHLD should be blocked between waitpid and sigsuspend calls,
-so that we don't miss a signal. If SIGCHLD arrives in between, when it's
+so that we don't miss a signal. If SIGCHLD arrives in between, when it's
blocked, the signal becomes pending and sigsuspend immediately
notices it and returns.
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
==============
#define O_LARGEFILE 0
#endif
-/* If the system headers did not provide the constants, hard-code the normal
- values. */
-#ifndef PTRACE_EVENT_FORK
-
-#define PTRACE_SETOPTIONS 0x4200
-#define PTRACE_GETEVENTMSG 0x4201
-
-/* options set using PTRACE_SETOPTIONS */
-#define PTRACE_O_TRACESYSGOOD 0x00000001
-#define PTRACE_O_TRACEFORK 0x00000002
-#define PTRACE_O_TRACEVFORK 0x00000004
-#define PTRACE_O_TRACECLONE 0x00000008
-#define PTRACE_O_TRACEEXEC 0x00000010
-#define PTRACE_O_TRACEVFORKDONE 0x00000020
-#define PTRACE_O_TRACEEXIT 0x00000040
-
-/* Wait extended result codes for the above trace options. */
-#define PTRACE_EVENT_FORK 1
-#define PTRACE_EVENT_VFORK 2
-#define PTRACE_EVENT_CLONE 3
-#define PTRACE_EVENT_EXEC 4
-#define PTRACE_EVENT_VFORK_DONE 5
-#define PTRACE_EVENT_EXIT 6
-
-#endif /* PTRACE_EVENT_FORK */
-
-/* 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. */
-#ifndef __WALL
-#define __WALL 0x40000000 /* Wait for any child. */
-#endif
-
-#ifndef PTRACE_GETSIGINFO
-#define PTRACE_GETSIGINFO 0x4202
-#endif
-
/* The single-threaded native GNU/Linux target_ops. We save a pointer for
the use of the multi-threaded target. */
static struct target_ops *linux_ops;
static struct target_ops linux_ops_saved;
/* The method to call, if any, when a new thread is attached. */
-static void (*linux_nat_new_thread) (ptid_t);
+static void (*linux_nat_new_thread) (struct lwp_info *);
+
+/* The method to call, if any, when a new fork is attached. */
+static linux_nat_new_fork_ftype *linux_nat_new_fork;
+
+/* The method to call, if any, when a process is no longer
+ attached. */
+static linux_nat_forget_process_ftype *linux_nat_forget_process_hook;
+
+/* Hook to call prior to resuming a thread. */
+static void (*linux_nat_prepare_to_resume) (struct lwp_info *);
+
+/* 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) (siginfo_t *,
+ 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 *,
- enum target_object,
- const char *, gdb_byte *,
- const gdb_byte *,
- ULONGEST, LONGEST);
+static target_xfer_partial_ftype *super_xfer_partial;
-static int debug_linux_nat;
+static unsigned int debug_linux_nat;
static void
show_debug_linux_nat (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
value);
}
-static int debug_linux_nat_async = 0;
-static void
-show_debug_linux_nat_async (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
-{
- fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"),
- value);
-}
-
-static int linux_parent_pid;
-
struct simple_pid_list
{
int pid;
};
struct simple_pid_list *stopped_pids;
-/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
- can not be used, 1 if it can. */
-
-static int linux_supports_tracefork_flag = -1;
-
-/* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
- PTRACE_O_TRACEVFORKDONE. */
-
-static int linux_supports_tracevforkdone_flag = -1;
-
-/* Async mode support */
-
-/* True if async mode is currently on. */
-static int linux_nat_async_enabled;
-
-/* Zero if the async mode, although enabled, is masked, which means
- linux_nat_wait should behave as if async mode was off. */
-static int linux_nat_async_mask_value = 1;
+/* Async mode support. */
/* 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);
-
-/* 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;
+/* Flush the event pipe. */
-static int
-queued_waitpid (int pid, int *status, int flags)
+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);
+ int ret;
+ char buf;
- 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
+ do
{
- for (; msg; prev = msg, msg = msg->next)
- if ((msg->options & __WCLONE) == 0
- && (pid == -1 || pid == msg->pid))
- break;
+ ret = read (linux_nat_event_pipe[0], &buf, 1);
}
+ while (ret >= 0 || (ret == -1 && errno == EINTR));
+}
- if (msg)
- {
- int pid;
-
- if (prev)
- prev->next = msg->next;
- else
- waitpid_queue = msg->next;
+/* 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. */
- msg->next = NULL;
- if (status)
- *status = msg->status;
- pid = msg->pid;
+static void
+async_file_mark (void)
+{
+ int ret;
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n",
- pid, msg->status);
- xfree (msg);
+ /* 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 ();
- return pid;
+ do
+ {
+ ret = write (linux_nat_event_pipe[1], "+", 1);
}
+ while (ret == -1 && errno == EINTR);
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "QWPID: miss\n");
-
- if (status)
- *status = 0;
- return -1;
+ /* Ignore EAGAIN. If the pipe is full, the event loop will already
+ be awakened anyway. */
}
-static void
-push_waitpid (int pid, int status, int options)
-{
- struct waitpid_result *event, *new_event;
-
- new_event = xmalloc (sizeof (*new_event));
- new_event->pid = pid;
- new_event->status = status;
- new_event->options = options;
- new_event->next = NULL;
+static void linux_nat_async (void (*callback)
+ (enum inferior_event_type event_type,
+ void *context),
+ void *context);
+static int kill_lwp (int lwpid, int signo);
- if (waitpid_queue)
- {
- for (event = waitpid_queue;
- event && event->next;
- event = event->next)
- ;
+static int stop_callback (struct lwp_info *lp, void *data);
- event->next = new_event;
- }
- else
- waitpid_queue = new_event;
-}
+static void block_child_signals (sigset_t *prev_mask);
+static void restore_child_signals_mask (sigset_t *prev_mask);
-/* 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)
- ;
-}
+struct lwp_info;
+static struct lwp_info *add_lwp (ptid_t ptid);
+static void purge_lwp_list (int pid);
+static void delete_lwp (ptid_t ptid);
+static struct lwp_info *find_lwp_pid (ptid_t ptid);
\f
/* Trivial list manipulation functions to keep track of a list of
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)
+in_pid_list_p (struct simple_pid_list *list, int pid)
+{
+ struct simple_pid_list *p;
+
+ for (p = list; p != NULL; p = p->next)
+ if (p->pid == pid)
+ return 1;
+ return 0;
+}
+
+static int
+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;
return 0;
}
-static void
-linux_record_stopped_pid (int pid, int status)
-{
- add_to_pid_list (&stopped_pids, pid, status);
-}
-
-\f
-/* A helper function for linux_test_for_tracefork, called after fork (). */
+/* Initialize ptrace warnings and check for supported ptrace
+ features given PID. */
static void
-linux_tracefork_child (void)
+linux_init_ptrace (pid_t pid)
{
- int ret;
-
- ptrace (PTRACE_TRACEME, 0, 0, 0);
- kill (getpid (), SIGSTOP);
- fork ();
- _exit (0);
+ linux_enable_event_reporting (pid);
+ linux_ptrace_init_warnings ();
}
-/* Wrapper function for waitpid which handles EINTR, and checks for
- locally queued events. */
-
-static int
-my_waitpid (int pid, int *status, int flags)
+static void
+linux_child_post_attach (int pid)
{
- 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);
- }
- while (ret == -1 && errno == EINTR);
-
- return ret;
+ linux_init_ptrace (pid);
}
-/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
-
- First, we try to enable fork 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.
-
- However, if it succeeds, we don't know for sure that the feature is
- available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
- create a child process, attach to it, use PTRACE_SETOPTIONS to enable
- fork tracing, and let it fork. If the process exits, we assume that we
- can't use TRACEFORK; if we get the fork notification, and we can extract
- the new child's PID, then we assume that we can. */
-
static void
-linux_test_for_tracefork (int original_pid)
+linux_child_post_startup_inferior (ptid_t ptid)
{
- int child_pid, ret, status;
- long second_pid;
-
- linux_supports_tracefork_flag = 0;
- linux_supports_tracevforkdone_flag = 0;
-
- ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
- if (ret != 0)
- return;
-
- child_pid = fork ();
- if (child_pid == -1)
- perror_with_name (("fork"));
-
- if (child_pid == 0)
- linux_tracefork_child ();
-
- ret = my_waitpid (child_pid, &status, 0);
- if (ret == -1)
- perror_with_name (("waitpid"));
- else if (ret != child_pid)
- error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret);
- if (! WIFSTOPPED (status))
- error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status);
-
- ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
- if (ret != 0)
- {
- ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
- if (ret != 0)
- {
- warning (_("linux_test_for_tracefork: failed to kill child"));
- return;
- }
-
- ret = my_waitpid (child_pid, &status, 0);
- if (ret != child_pid)
- warning (_("linux_test_for_tracefork: failed to wait for killed child"));
- else if (!WIFSIGNALED (status))
- warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
- "killed child"), status);
-
- return;
- }
-
- /* Check whether PTRACE_O_TRACEVFORKDONE is available. */
- ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0,
- PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
- linux_supports_tracevforkdone_flag = (ret == 0);
-
- ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
- if (ret != 0)
- warning (_("linux_test_for_tracefork: failed to resume child"));
-
- ret = my_waitpid (child_pid, &status, 0);
-
- if (ret == child_pid && WIFSTOPPED (status)
- && status >> 16 == PTRACE_EVENT_FORK)
- {
- second_pid = 0;
- ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
- if (ret == 0 && second_pid != 0)
- {
- int second_status;
-
- linux_supports_tracefork_flag = 1;
- my_waitpid (second_pid, &second_status, 0);
- ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
- if (ret != 0)
- warning (_("linux_test_for_tracefork: failed to kill second child"));
- my_waitpid (second_pid, &status, 0);
- }
- }
- else
- warning (_("linux_test_for_tracefork: unexpected result from waitpid "
- "(%d, status 0x%x)"), ret, status);
-
- ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
- if (ret != 0)
- warning (_("linux_test_for_tracefork: failed to kill child"));
- my_waitpid (child_pid, &status, 0);
+ linux_init_ptrace (ptid_get_pid (ptid));
}
-/* Return non-zero iff we have tracefork functionality available.
- This function also sets linux_supports_tracefork_flag. */
-
-static int
-linux_supports_tracefork (int pid)
-{
- if (linux_supports_tracefork_flag == -1)
- linux_test_for_tracefork (pid);
- return linux_supports_tracefork_flag;
-}
+/* Return the number of known LWPs in the tgid given by PID. */
static int
-linux_supports_tracevforkdone (int pid)
-{
- if (linux_supports_tracefork_flag == -1)
- linux_test_for_tracefork (pid);
- return linux_supports_tracevforkdone_flag;
-}
-
-\f
-void
-linux_enable_event_reporting (ptid_t ptid)
+num_lwps (int pid)
{
- 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;
- if (linux_supports_tracevforkdone (pid))
- options |= PTRACE_O_TRACEVFORKDONE;
+ int count = 0;
+ struct lwp_info *lp;
- /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
- read-only process state. */
+ for (lp = lwp_list; lp; lp = lp->next)
+ if (ptid_get_pid (lp->ptid) == pid)
+ count++;
- ptrace (PTRACE_SETOPTIONS, pid, 0, options);
+ return count;
}
-static void
-linux_child_post_attach (int pid)
-{
- linux_enable_event_reporting (pid_to_ptid (pid));
- check_for_thread_db ();
-}
+/* Call delete_lwp with prototype compatible for make_cleanup. */
static void
-linux_child_post_startup_inferior (ptid_t ptid)
+delete_lwp_cleanup (void *lp_voidp)
{
- linux_enable_event_reporting (ptid);
- check_for_thread_db ();
+ struct lwp_info *lp = lp_voidp;
+
+ delete_lwp (lp->ptid);
}
static int
-linux_child_follow_fork (struct target_ops *ops, int follow_child)
+linux_child_follow_fork (struct target_ops *ops, int follow_child,
+ int detach_fork)
{
- ptid_t last_ptid;
- struct target_waitstatus last_status;
int has_vforked;
int parent_pid, child_pid;
- if (target_can_async_p ())
- target_async (NULL, 0);
-
- 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 = last_status.value.related_pid;
+ parent_pid = ptid_get_pid (inferior_ptid);
+ child_pid
+ = ptid_get_pid (inferior_thread ()->pending_follow.value.related_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"));
+ /* FIXME output string > 80 columns. */
+ 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)
{
+ struct cleanup *old_chain;
+
+ /* 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 (ptid_get_pid (inferior_ptid));
+ }
+
if (info_verbose || debug_linux_nat)
{
target_terminal_ours ();
fprintf_filtered (gdb_stdlog,
- "Detaching after fork from child process %d.\n",
+ "Detaching after fork from "
+ "child process %d.\n",
child_pid);
}
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = ptid_build (child_pid, child_pid, 0);
+
+ child_lp = add_lwp (inferior_ptid);
+ child_lp->stopped = 1;
+ child_lp->last_resume_kind = resume_stop;
+ make_cleanup (delete_lwp_cleanup, child_lp);
+
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (child_lp);
ptrace (PTRACE_DETACH, child_pid, 0, 0);
+
+ do_cleanups (old_chain);
}
else
{
- struct fork_info *fp;
- /* 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);
+ struct inferior *parent_inf, *child_inf;
+ struct cleanup *old_chain;
+
+ /* Add process to GDB's tables. */
+ child_inf = add_inferior (child_pid);
+
+ parent_inf = current_inferior ();
+ child_inf->attach_flag = parent_inf->attach_flag;
+ copy_terminal_info (child_inf, parent_inf);
+ child_inf->gdbarch = parent_inf->gdbarch;
+ copy_inferior_target_desc_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->last_resume_kind = resume_stop;
+ child_inf->symfile_flags = SYMFILE_NO_READ;
+
+ /* 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)
{
- gdb_assert (linux_supports_tracefork_flag >= 0);
- if (linux_supports_tracevforkdone (0))
- {
- int status;
+ struct lwp_info *parent_lp;
+ struct inferior *parent_inf;
- 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);
+ 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;
+
+ parent_lp = find_lwp_pid (pid_to_ptid (parent_pid));
+ gdb_assert (linux_supports_tracefork () >= 0);
+
+ if (linux_supports_tracevforkdone ())
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LCFF: waiting for VFORK_DONE on %d\n",
+ parent_pid);
+ parent_lp->stopped = 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. */
+ parent_lp->status = 0;
+ parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE;
+ parent_lp->stopped = 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
{
- char child_pid_spelling[40];
-
- /* 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 *child_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);
+ child_inf->gdbarch = parent_inf->gdbarch;
+ copy_inferior_target_desc_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;
- 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);
+ /* 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);
+ child_lp = add_lwp (inferior_ptid);
+ child_lp->stopped = 1;
+ child_lp->last_resume_kind = resume_stop;
+
+ /* 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;
+ child_inf->symfile_flags = SYMFILE_NO_READ;
+ 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);
-
return 0;
}
\f
-static void
+static int
linux_child_insert_fork_catchpoint (int pid)
{
- if (! linux_supports_tracefork (pid))
- error (_("Your system does not support fork catchpoints."));
+ return !linux_supports_tracefork ();
}
-static void
+static int
+linux_child_remove_fork_catchpoint (int pid)
+{
+ return 0;
+}
+
+static int
linux_child_insert_vfork_catchpoint (int pid)
{
- if (!linux_supports_tracefork (pid))
- error (_("Your system does not support vfork catchpoints."));
+ return !linux_supports_tracefork ();
}
-static void
+static int
+linux_child_remove_vfork_catchpoint (int pid)
+{
+ return 0;
+}
+
+static int
linux_child_insert_exec_catchpoint (int pid)
{
- if (!linux_supports_tracefork (pid))
- error (_("Your system does not support exec catchpoints."));
+ return !linux_supports_tracefork ();
+}
+
+static int
+linux_child_remove_exec_catchpoint (int pid)
+{
+ return 0;
+}
+
+static int
+linux_child_set_syscall_catchpoint (int pid, int needed, int any_count,
+ int table_size, int *table)
+{
+ if (!linux_supports_tracesysgood ())
+ return 1;
+
+ /* 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
/* 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 for asynchronous mode. */
-static struct sigaction async_sigchld_action;
+/* SIGCHLD action. */
+struct sigaction sigchld_action;
-/* SIGCHLD default action, to pass to new inferiors. */
-static struct sigaction sigchld_default_action;
-\f
+/* Block child signals (SIGCHLD and linux threads signals), and store
+ the previous mask in PREV_MASK. */
-/* 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 char *linux_child_pid_to_exec_file (int pid);
-static int cancel_breakpoint (struct lwp_info *lp);
+static void
+block_child_signals (sigset_t *prev_mask)
+{
+ /* Make sure SIGCHLD is blocked. */
+ if (!sigismember (&blocked_mask, SIGCHLD))
+ sigaddset (&blocked_mask, SIGCHLD);
-\f
-/* Convert wait status STATUS to a string. Used for printing debug
- messages only. */
+ sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask);
+}
-static char *
-status_to_str (int status)
-{
- static char buf[64];
+/* Restore child signals mask, previously returned by
+ block_child_signals. */
- if (WIFSTOPPED (status))
- snprintf (buf, sizeof (buf), "%s (stopped)",
- strsignal (WSTOPSIG (status)));
+static void
+restore_child_signals_mask (sigset_t *prev_mask)
+{
+ sigprocmask (SIG_SETMASK, prev_mask, NULL);
+}
+
+/* Mask of signals to pass directly to the inferior. */
+static sigset_t pass_mask;
+
+/* Update signals to pass to the inferior. */
+static void
+linux_nat_pass_signals (int numsigs, unsigned char *pass_signals)
+{
+ int signo;
+
+ sigemptyset (&pass_mask);
+
+ for (signo = 1; signo < NSIG; signo++)
+ {
+ int target_signo = gdb_signal_from_host (signo);
+ if (target_signo < numsigs && pass_signals[target_signo])
+ sigaddset (&pass_mask, signo);
+ }
+}
+
+\f
+
+/* Prototypes for local functions. */
+static int stop_wait_callback (struct lwp_info *lp, void *data);
+static int linux_thread_alive (ptid_t ptid);
+static char *linux_child_pid_to_exec_file (int pid);
+
+\f
+/* Convert wait status STATUS to a string. Used for printing debug
+ messages only. */
+
+static char *
+status_to_str (int status)
+{
+ static char buf[64];
+
+ if (WIFSTOPPED (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. */
+/* Destroy and free LP. */
static void
-init_lwp_list (void)
+lwp_free (struct lwp_info *lp)
{
- struct lwp_info *lp, *lpnext;
+ xfree (lp->arch_private);
+ xfree (lp);
+}
+
+/* Remove all LWPs belong to PID from the lwp list. */
+
+static void
+purge_lwp_list (int pid)
+{
+ struct lwp_info *lp, *lpprev, *lpnext;
+
+ lpprev = NULL;
for (lp = lwp_list; lp; lp = lpnext)
{
lpnext = lp->next;
- xfree (lp);
- }
- lwp_list = NULL;
- num_lwps = 0;
+ if (ptid_get_pid (lp->ptid) == pid)
+ {
+ if (lp == lwp_list)
+ lwp_list = lp->next;
+ else
+ lpprev->next = lp->next;
+
+ lwp_free (lp);
+ }
+ else
+ lpprev = lp;
+ }
}
-/* Add the LWP specified by PID to the list. Return a pointer to the
- structure describing the new LWP. The LWP should already be stopped
- (with an exception for the very first LWP). */
+/* Add the LWP specified by PTID to the list. PTID is the first LWP
+ in the process. Return a pointer to the structure describing the
+ new LWP.
+
+ This differs from add_lwp in that we don't let the arch specific
+ bits know about this new thread. Current clients of this callback
+ take the opportunity to install watchpoints in the new thread, and
+ we shouldn't do that for the first thread. If we're spawning a
+ child ("run"), the thread executes the shell wrapper first, and we
+ shouldn't touch it until it execs the program we want to debug.
+ For "attach", it'd be okay to call the callback, but it's not
+ necessary, because watchpoints can't yet have been inserted into
+ the inferior. */
static struct lwp_info *
-add_lwp (ptid_t ptid)
+add_initial_lwp (ptid_t ptid)
{
struct lwp_info *lp;
- gdb_assert (is_lwp (ptid));
+ gdb_assert (ptid_lwp_p (ptid));
lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
memset (lp, 0, sizeof (struct lwp_info));
+ lp->last_resume_kind = resume_continue;
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)
- linux_nat_new_thread (ptid);
+ return lp;
+}
+
+/* Add the LWP specified by PID to the list. Return a pointer to the
+ structure describing the new LWP. The LWP should already be
+ stopped. */
+
+static struct lwp_info *
+add_lwp (ptid_t ptid)
+{
+ struct lwp_info *lp;
+
+ lp = add_initial_lwp (ptid);
+
+ /* Let the arch specific bits know about this new thread. Current
+ clients of this callback take the opportunity to install
+ watchpoints in the new thread. We don't do this for the first
+ thread though. See add_initial_lwp. */
+ if (linux_nat_new_thread != NULL)
+ linux_nat_new_thread (lp);
return lp;
}
if (!lp)
return;
- num_lwps--;
-
if (lpprev)
lpprev->next = lp->next;
else
lwp_list = lp->next;
- xfree (lp);
+ lwp_free (lp);
}
/* Return a pointer to the structure describing the LWP corresponding
struct lwp_info *lp;
int lwp;
- if (is_lwp (ptid))
- lwp = GET_LWP (ptid);
+ if (ptid_lwp_p (ptid))
+ lwp = ptid_get_lwp (ptid);
else
- lwp = GET_PID (ptid);
+ lwp = ptid_get_pid (ptid);
for (lp = lwp_list; lp; lp = lp->next)
- if (lwp == GET_LWP (lp->ptid))
+ if (lwp == ptid_get_lwp (lp->ptid))
return lp;
return NULL;
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_thread_list ();
- init_lwp_list ();
+ purge_lwp_list (ptid_get_pid (inferior_ptid));
+
lp = add_lwp (new_ptid);
- add_thread_silent (new_ptid);
lp->stopped = 1;
-}
-
-/* Record a PTID for later deletion. */
-
-struct saved_ptids
-{
- ptid_t ptid;
- struct saved_ptids *next;
-};
-static struct saved_ptids *threads_to_delete;
-
-static void
-record_dead_thread (ptid_t ptid)
-{
- struct saved_ptids *p = xmalloc (sizeof (struct saved_ptids));
- p->ptid = ptid;
- p->next = threads_to_delete;
- threads_to_delete = p;
-}
-
-/* Delete any dead threads which are not the current thread. */
-static void
-prune_lwps (void)
-{
- struct saved_ptids **p = &threads_to_delete;
+ /* 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);
- while (*p)
- if (! ptid_equal ((*p)->ptid, inferior_ptid))
- {
- struct saved_ptids *tmp = *p;
- delete_thread (tmp->ptid);
- *p = tmp->next;
- xfree (tmp);
- }
- else
- p = &(*p)->next;
+ /* 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)
{
if (print_thread_events)
printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid));
- /* Core GDB cannot deal with us deleting the current thread. */
- if (!ptid_equal (lp->ptid, inferior_ptid))
- delete_thread (lp->ptid);
- else
- record_dead_thread (lp->ptid);
+ delete_thread (lp->ptid);
}
delete_lwp (lp->ptid);
}
-/* Detect `T (stopped)' in `/proc/PID/status'.
- Other states including `T (tracing stop)' are reported as false. */
-
-static int
-pid_is_stopped (pid_t pid)
-{
- FILE *status_file;
- char buf[100];
- int retval = 0;
-
- snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid);
- status_file = fopen (buf, "r");
- if (status_file != NULL)
- {
- int have_state = 0;
-
- while (fgets (buf, sizeof (buf), status_file))
- {
- if (strncmp (buf, "State:", 6) == 0)
- {
- have_state = 1;
- break;
- }
- }
- if (have_state && strstr (buf, "T (stopped)") != NULL)
- retval = 1;
- fclose (status_file);
- }
- return retval;
-}
-
/* Wait for the LWP specified by LP, which we have just attached to.
Returns a wait status for that LWP, to cache. */
linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned,
int *signalled)
{
- pid_t new_pid, pid = GET_LWP (ptid);
+ pid_t new_pid, pid = ptid_get_lwp (ptid);
int status;
- if (pid_is_stopped (pid))
+ if (linux_proc_pid_is_stopped (pid))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
*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)
{
return status;
}
-/* Attach to the LWP specified by PID. Return 0 if successful or -1
- if the new LWP could not be attached. */
+/* Attach to the LWP specified by PID. Return 0 if successful, -1 if
+ the new LWP could not be attached, or 1 if we're already auto
+ attached to this thread, but haven't processed the
+ PTRACE_EVENT_CLONE event of its parent thread, so we just ignore
+ its existance, without considering it an error. */
int
lin_lwp_attach_lwp (ptid_t ptid)
{
struct lwp_info *lp;
- enum sigchld_state async_events_original_state;
-
- gdb_assert (is_lwp (ptid));
+ int lwpid;
- async_events_original_state = linux_nat_async_events (sigchld_sync);
+ gdb_assert (ptid_lwp_p (ptid));
lp = find_lwp_pid (ptid);
+ lwpid = ptid_get_lwp (ptid);
/* We assume that we're already attached to any LWP that has an id
equal to the overall process id, and to any LWP that is already
and we've had PID wraparound since we last tried to stop all threads,
this assumption might be wrong; fortunately, this is very unlikely
to happen. */
- if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL)
+ if (lwpid != ptid_get_pid (ptid) && lp == NULL)
{
int status, cloned = 0, signalled = 0;
- if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
+ if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0)
{
+ if (linux_supports_tracefork ())
+ {
+ /* If we haven't stopped all threads when we get here,
+ we may have seen a thread listed in thread_db's list,
+ but not processed the PTRACE_EVENT_CLONE yet. If
+ that's the case, ignore this new thread, and let
+ normal event handling discover it later. */
+ if (in_pid_list_p (stopped_pids, lwpid))
+ {
+ /* We've already seen this thread stop, but we
+ haven't seen the PTRACE_EVENT_CLONE extended
+ event yet. */
+ return 0;
+ }
+ else
+ {
+ int new_pid;
+ int status;
+
+ /* See if we've got a stop for this new child
+ pending. If so, we're already attached. */
+ new_pid = my_waitpid (lwpid, &status, WNOHANG);
+ if (new_pid == -1 && errno == ECHILD)
+ new_pid = my_waitpid (lwpid, &status, __WCLONE | WNOHANG);
+ if (new_pid != -1)
+ {
+ if (WIFSTOPPED (status))
+ add_to_pid_list (&stopped_pids, lwpid, status);
+ return 1;
+ }
+ }
+ }
+
/* If we fail to attach to the thread, issue a warning,
but continue. One way this can happen is if thread
creation is interrupted; as of Linux kernel 2.6.19, a
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->status = status;
}
- target_post_attach (GET_LWP (lp->ptid));
+ target_post_attach (ptid_get_lwp (lp->ptid));
if (debug_linux_nat)
{
lp->stopped = 1;
}
- linux_nat_async_events (async_events_original_state);
+ lp->last_resume_kind = resume_stop;
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
+#ifdef HAVE_PERSONALITY
+ if (disable_randomization)
{
- /* 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);
+ errno = 0;
+ personality_orig = personality (0xffffffff);
+ if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE))
+ {
+ personality_set = 1;
+ personality (personality_orig | ADDR_NO_RANDOMIZE);
+ }
+ if (errno != 0 || (personality_set
+ && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE)))
+ warning (_("Error disabling address space randomization: %s"),
+ safe_strerror (errno));
}
+#endif /* HAVE_PERSONALITY */
- /* 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);
+ /* Make sure we report all signals during startup. */
+ linux_nat_pass_signals (0, NULL);
- linux_ops->to_create_inferior (exec_file, allargs, env, from_tty);
+ linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty);
- if (saved_async)
- linux_nat_async_mask (saved_async);
+#ifdef HAVE_PERSONALITY
+ if (personality_set)
+ {
+ errno = 0;
+ personality (personality_orig);
+ if (errno != 0)
+ warning (_("Error restoring address space randomization: %s"),
+ safe_strerror (errno));
+ }
+#endif /* HAVE_PERSONALITY */
}
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;
+ volatile struct gdb_exception ex;
- /* FIXME: We should probably accept a list of process id's, and
- attach all of them. */
- linux_ops->to_attach (args, from_tty);
+ /* Make sure we report all signals during attach. */
+ linux_nat_pass_signals (0, NULL);
- if (!target_can_async_p ())
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ linux_ops->to_attach (ops, args, from_tty);
+ }
+ if (ex.reason < 0)
{
- /* 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);
+ pid_t pid = parse_pid_to_attach (args);
+ struct buffer buffer;
+ char *message, *buffer_s;
+
+ message = xstrdup (ex.message);
+ make_cleanup (xfree, message);
+
+ buffer_init (&buffer);
+ linux_ptrace_attach_warnings (pid, &buffer);
+
+ buffer_grow_str0 (&buffer, "");
+ buffer_s = buffer_finish (&buffer);
+ make_cleanup (xfree, buffer_s);
+
+ throw_error (ex.error, "%s%s", buffer_s, message);
}
+ /* The ptrace base target adds the main thread with (pid,0,0)
+ format. Decorate it with lwp info. */
+ ptid = ptid_build (ptid_get_pid (inferior_ptid),
+ ptid_get_pid (inferior_ptid),
+ 0);
+ thread_change_ptid (inferior_ptid, ptid);
+
/* Add the initial process as the first LWP to the list. */
- inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid));
- lp = add_lwp (inferior_ptid);
+ lp = add_initial_lwp (ptid);
status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned,
&lp->signalled);
- lp->stopped = 1;
+ 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 gdb_signal signo;
+
+ target_terminal_ours ();
+ target_mourn_inferior ();
+
+ signo = gdb_signal_from_host (WTERMSIG (status));
+ error (_("Unable to attach: program terminated with signal "
+ "%s, %s."),
+ gdb_signal_to_name (signo),
+ gdb_signal_to_string (signo));
+ }
+
+ internal_error (__FILE__, __LINE__,
+ _("unexpected status %d for PID %ld"),
+ status, (long) ptid_get_lwp (ptid));
+ }
- /* If this process is not using thread_db, then we still don't
- detect any other threads, but add at least this one. */
- add_thread_silent (lp->ptid);
+ lp->stopped = 1;
/* Save the wait status to report later. */
lp->resumed = 1;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LNA: waitpid %ld, saving status %s\n",
- (long) GET_PID (lp->ptid), status_to_str (status));
+ (long) ptid_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 gdb_signal signo = GDB_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 GDB_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 (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
+ signo = GDB_SIGNAL_0; /* a pending ptrace event, not a real signal. */
+ else if (lp->status)
+ signo = gdb_signal_from_host (WSTOPSIG (lp->status));
+ else if (non_stop && !is_executing (lp->ptid))
+ {
+ struct thread_info *tp = find_thread_ptid (lp->ptid);
- /* 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. */
+ signo = tp->suspend.stop_signal;
+ }
+ else if (!non_stop)
+ {
+ struct target_waitstatus last;
+ ptid_t last_ptid;
+
+ get_last_target_status (&last_ptid, &last);
+
+ if (ptid_get_lwp (lp->ptid) == ptid_get_lwp (last_ptid))
+ {
+ struct thread_info *tp = find_thread_ptid (lp->ptid);
+
+ signo = tp->suspend.stop_signal;
+ }
+ }
*status = 0;
- if (GET_LWP (lp->ptid) == GET_LWP (last_ptid))
+
+ if (signo == GDB_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 (stop_signal != TARGET_SIGNAL_0
- && signal_pass_state (stop_signal))
- *status = W_STOPCODE (target_signal_to_host (stop_signal));
+ 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),
+ gdb_signal_to_string (signo));
}
- else if (target_can_async_p ())
- queued_waitpid (GET_LWP (lp->ptid), status, __WALL);
else
- *status = lp->status;
+ {
+ *status = W_STOPCODE (gdb_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),
+ gdb_signal_to_string (signo));
+ }
return 0;
}
"DC: Sending SIGCONT to %s\n",
target_pid_to_str (lp->ptid));
- kill_lwp (GET_LWP (lp->ptid), SIGCONT);
+ kill_lwp (ptid_get_lwp (lp->ptid), SIGCONT);
lp->signalled = 0;
}
/* We don't actually detach from the LWP that has an id equal to the
overall process id just yet. */
- if (GET_LWP (lp->ptid) != GET_PID (lp->ptid))
+ if (ptid_get_lwp (lp->ptid) != ptid_get_pid (lp->ptid))
{
int status = 0;
/* Pass on any pending signal for this LWP. */
get_pending_status (lp, &status);
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
errno = 0;
- if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
+ if (ptrace (PTRACE_DETACH, ptid_get_lwp (lp->ptid), 0,
WSTOPSIG (status)) < 0)
error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid),
safe_strerror (errno));
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, const char *args, int from_tty)
{
int pid;
int status;
- enum target_signal sig;
+ struct lwp_info *main_lwp;
- if (target_can_async_p ())
- linux_nat_async (NULL, 0);
+ pid = ptid_get_pid (inferior_ptid);
+
+ /* Don't unregister from the event loop, as there may be other
+ inferiors running. */
- iterate_over_lwps (detach_callback, NULL);
+ /* Stop all threads before detaching. ptrace requires that the
+ thread is stopped to sucessfully detach. */
+ 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 (pid_to_ptid (pid), stop_wait_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 (ptid_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))
{
+ char *tem;
+
/* 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));
+ tem = alloca (8);
+ xsnprintf (tem, 8, "%d", (int) WSTOPSIG (status));
+ args = tem;
+ 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 ();
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (main_lwp);
+ delete_lwp (main_lwp->ptid);
- pid = GET_PID (inferior_ptid);
- inferior_ptid = pid_to_ptid (pid);
- linux_ops->to_detach (args, from_tty);
-
- 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);
+ }
+ else
+ linux_ops->to_detach (ops, args, from_tty);
}
/* Resume LP. */
-static int
-resume_callback (struct lwp_info *lp, void *data)
+static void
+resume_lwp (struct lwp_info *lp, int step, enum gdb_signal signo)
{
- if (lp->stopped && lp->status == 0)
+ if (lp->stopped)
+ {
+ struct inferior *inf = find_inferior_pid (ptid_get_pid (lp->ptid));
+
+ if (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->status == 0
+ && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RC: Resuming sibling %s, %s, %s\n",
+ target_pid_to_str (lp->ptid),
+ (signo != GDB_SIGNAL_0
+ ? strsignal (gdb_signal_to_host (signo))
+ : "0"),
+ step ? "step" : "resume");
+
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops,
+ pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ step, signo);
+ lp->stopped = 0;
+ lp->step = step;
+ lp->stopped_by_watchpoint = 0;
+ }
+ else
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "RC: Not resuming sibling %s (has pending)\n",
+ target_pid_to_str (lp->ptid));
+ }
+ }
+ else
{
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
- 0, TARGET_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
- "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
+ "RC: Not resuming sibling %s (not stopped)\n",
target_pid_to_str (lp->ptid));
- lp->stopped = 0;
- lp->step = 0;
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+ }
+}
+
+/* Resume LWP, with the last stop signal, if it is in pass state. */
+
+static int
+linux_nat_resume_callback (struct lwp_info *lp, void *data)
+{
+ enum gdb_signal signo = GDB_SIGNAL_0;
+
+ if (lp->stopped)
+ {
+ struct thread_info *thread;
+
+ thread = find_thread_ptid (lp->ptid);
+ if (thread != NULL)
+ {
+ if (signal_pass_state (thread->suspend.stop_signal))
+ signo = thread->suspend.stop_signal;
+ thread->suspend.stop_signal = GDB_SIGNAL_0;
+ }
}
+ resume_lwp (lp, 0, signo);
return 0;
}
resume_clear_callback (struct lwp_info *lp, void *data)
{
lp->resumed = 0;
+ lp->last_resume_kind = resume_stop;
return 0;
}
resume_set_callback (struct lwp_info *lp, void *data)
{
lp->resumed = 1;
+ lp->last_resume_kind = resume_continue;
return 0;
}
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 gdb_signal signo)
{
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 != GDB_SIGNAL_0
+ ? strsignal (gdb_signal_to_host (signo)) : "0"),
target_pid_to_str (inferior_ptid));
- prune_lwps ();
-
- if (target_can_async_p ())
- /* Block events while we're here. */
- linux_nat_async_events (sigchld_sync);
-
/* A specific PTID means `step only this process id'. */
- resume_all = (PIDGET (ptid) == -1);
+ resume_many = (ptid_equal (minus_one_ptid, ptid)
+ || ptid_is_pid (ptid));
- if (resume_all)
- iterate_over_lwps (resume_set_callback, NULL);
- else
- iterate_over_lwps (resume_clear_callback, NULL);
-
- /* 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);
- ptid = pid_to_ptid (GET_LWP (lp->ptid));
-
/* Remember if we're stepping. */
lp->step = step;
-
- /* Mark this LWP as resumed. */
- lp->resumed = 1;
+ lp->last_resume_kind = step ? resume_step : resume_continue;
/* If we have a pending wait status for this thread, there is no
point in resuming the process. But first make sure that
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 = target_signal_from_host (WSTOPSIG (lp->status));
-
- if (signal_stop_state (saved_signo) == 0
- && signal_print_state (saved_signo) == 0
- && signal_pass_state (saved_signo) == 1)
+ if (!lp->step
+ && WSTOPSIG (lp->status)
+ && sigismember (&pass_mask, WSTOPSIG (lp->status)))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
/* FIXME: What should we do if we are supposed to continue
this thread with a signal? */
- gdb_assert (signo == TARGET_SIGNAL_0);
- signo = saved_signo;
+ gdb_assert (signo == GDB_SIGNAL_0);
+ signo = gdb_signal_from_host (WSTOPSIG (lp->status));
lp->status = 0;
}
}
- 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? */
- gdb_assert (signo == TARGET_SIGNAL_0);
+ gdb_assert (signo == GDB_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LLR: Short circuiting for status 0x%x\n",
lp->status);
+ if (target_can_async_p ())
+ {
+ target_async (inferior_event_handler, 0);
+ /* Tell the event loop we have something to process. */
+ async_file_mark ();
+ }
return;
}
/* Mark LWP as not stopped to prevent it from being continued by
- resume_callback. */
+ linux_nat_resume_callback. */
lp->stopped = 0;
- if (resume_all)
- iterate_over_lwps (resume_callback, NULL);
+ if (resume_many)
+ iterate_over_lwps (ptid, linux_nat_resume_callback, NULL);
+
+ /* Convert to something the lower layer understands. */
+ ptid = pid_to_ptid (ptid_get_lwp (lp->ptid));
- linux_ops->to_resume (ptid, step, signo);
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops, ptid, step, signo);
+ 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 != GDB_SIGNAL_0
+ ? strsignal (gdb_signal_to_host (signo)) : "0"));
if (target_can_async_p ())
- {
- target_executing = 1;
- target_async (inferior_event_handler, 0);
- }
+ 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,
+ ptid_get_lwp (lp->ptid));
+
+ lp->syscall_state = TARGET_WAITKIND_IGNORE;
+ ptrace (PTRACE_CONT, ptid_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,
+ ptid_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,
+ ptid_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,
+ ptid_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 ();
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops, pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ lp->step, GDB_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
linux_handle_extended_wait (struct lwp_info *lp, int status,
int stopping)
{
- int pid = GET_LWP (lp->ptid);
+ int pid = ptid_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
_("wait returned unexpected status 0x%x"), status);
}
- ourstatus->value.related_pid = new_pid;
+ ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0);
+
+ if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK)
+ {
+ /* The arch-specific native code may need to know about new
+ forks even if those end up never mapped to an
+ inferior. */
+ if (linux_nat_new_fork != NULL)
+ linux_nat_new_fork (lp, new_pid);
+ }
+
+ if (event == PTRACE_EVENT_FORK
+ && linux_fork_checkpointing_p (ptid_get_pid (lp->ptid)))
+ {
+ /* 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 (ptid_build (new_pid, new_pid, 0));
+
+ /* Retain child fork in ptrace (stopped) state. */
+ if (!find_fork_pid (new_pid))
+ 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;
+
+ /* Report the stop to the core. */
+ return 0;
+ }
if (event == PTRACE_EVENT_FORK)
ourstatus->kind = TARGET_WAITKIND_FORKED;
ourstatus->kind = TARGET_WAITKIND_VFORKED;
else
{
+ struct lwp_info *new_lp;
+
ourstatus->kind = TARGET_WAITKIND_IGNORE;
- new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid)));
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: Got clone event "
+ "from LWP %d, new child is LWP %ld\n",
+ pid, new_pid);
+
+ new_lp = add_lwp (ptid_build (ptid_get_pid (lp->ptid), new_pid, 0));
new_lp->cloned = 1;
+ new_lp->stopped = 1;
if (WSTOPSIG (status) != SIGSTOP)
{
new_lp->signalled = 1;
}
else
- status = 0;
+ {
+ struct thread_info *tp;
+
+ /* When we stop for an event in some other thread, and
+ pull the thread list just as this thread has cloned,
+ we'll have seen the new thread in the thread_db list
+ before handling the CLONE event (glibc's
+ pthread_create adds the new thread to the thread list
+ before clone'ing, and has the kernel fill in the
+ thread's tid on the clone call with
+ CLONE_PARENT_SETTID). If that happened, and the core
+ had requested the new thread to stop, we'll have
+ killed it with SIGSTOP. But since SIGSTOP is not an
+ RT signal, it can only be queued once. We need to be
+ careful to not resume the LWP if we wanted it to
+ stop. In that case, we'll leave the SIGSTOP pending.
+ It will later be reported as GDB_SIGNAL_0. */
+ tp = find_thread_ptid (new_lp->ptid);
+ if (tp != NULL && tp->stop_requested)
+ new_lp->last_resume_kind = resume_stop;
+ else
+ status = 0;
+ }
- if (stopping)
- new_lp->stopped = 1;
- else
+ if (non_stop)
+ {
+ /* Add the new thread to GDB's lists as soon as possible
+ so that:
+
+ 1) the frontend doesn't have to wait for a stop to
+ display them, and,
+
+ 2) we tag it with the correct running state. */
+
+ /* If the thread_db layer is active, let it know about
+ this new thread, and add it to GDB's list. */
+ if (!thread_db_attach_lwp (new_lp->ptid))
+ {
+ /* We're not using thread_db. Add it to GDB's
+ list. */
+ target_post_attach (ptid_get_lwp (new_lp->ptid));
+ add_thread (new_lp->ptid);
+ }
+
+ if (!stopping)
+ {
+ set_running (new_lp->ptid, 1);
+ set_executing (new_lp->ptid, 1);
+ /* thread_db_attach_lwp -> lin_lwp_attach_lwp forced
+ resume_stop. */
+ new_lp->last_resume_kind = resume_continue;
+ }
+ }
+
+ 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) ptid_get_lwp (new_lp->ptid),
+ status_to_str (status));
+ new_lp->status = status;
+ }
+
+ /* Note the need to use the low target ops to resume, to
+ handle resuming with PT_SYSCALL if we have syscall
+ catchpoints. */
+ if (!stopping)
{
new_lp->resumed = 1;
- ptrace (PTRACE_CONT, lp->waitstatus.value.related_pid, 0,
- status ? WSTOPSIG (status) : 0);
+
+ if (status == 0)
+ {
+ gdb_assert (new_lp->last_resume_kind == resume_continue);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: resuming new LWP %ld\n",
+ ptid_get_lwp (new_lp->ptid));
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (new_lp);
+ linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid),
+ 0, GDB_SIGNAL_0);
+ new_lp->stopped = 0;
+ }
}
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);
+ "LHEW: resuming parent LWP %d\n", pid);
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops,
+ pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ 0, GDB_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",
+ ptid_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",
+ ptid_get_lwp (lp->ptid));
- linux_parent_pid = 0;
+ ourstatus->kind = TARGET_WAITKIND_VFORK_DONE;
+ return 0;
}
- return 0;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LHEW: Got PTRACE_EVENT_VFORK_DONE "
+ "from LWP %ld: resuming\n",
+ ptid_get_lwp (lp->ptid));
+ ptrace (PTRACE_CONT, ptid_get_lwp (lp->ptid), 0, 0);
+ return 1;
}
internal_error (__FILE__, __LINE__,
wait_lwp (struct lwp_info *lp)
{
pid_t pid;
- int status;
+ int status = 0;
int thread_dead = 0;
+ sigset_t prev_mask;
gdb_assert (!lp->stopped);
gdb_assert (lp->status == 0);
- pid = my_waitpid (GET_LWP (lp->ptid), &status, 0);
- if (pid == -1 && errno == ECHILD)
+ /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */
+ block_child_signals (&prev_mask);
+
+ for (;;)
{
- pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
+ /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind
+ was right and we should just call sigsuspend. */
+
+ pid = my_waitpid (ptid_get_lwp (lp->ptid), &status, WNOHANG);
+ if (pid == -1 && errno == ECHILD)
+ pid = my_waitpid (ptid_get_lwp (lp->ptid), &status, __WCLONE | WNOHANG);
if (pid == -1 && errno == ECHILD)
{
/* The thread has previously exited. We need to delete it
fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n",
target_pid_to_str (lp->ptid));
}
+ if (pid != 0)
+ break;
+
+ /* Bugs 10970, 12702.
+ Thread group leader may have exited in which case we'll lock up in
+ waitpid if there are other threads, even if they are all zombies too.
+ Basically, we're not supposed to use waitpid this way.
+ __WCLONE is not applicable for the leader so we can't use that.
+ LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED
+ process; it gets ESRCH both for the zombie and for running processes.
+
+ As a workaround, check if we're waiting for the thread group leader and
+ if it's a zombie, and avoid calling waitpid if it is.
+
+ This is racy, what if the tgl becomes a zombie right after we check?
+ Therefore always use WNOHANG with sigsuspend - it is equivalent to
+ waiting waitpid but linux_proc_pid_is_zombie is safe this way. */
+
+ if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid)
+ && linux_proc_pid_is_zombie (ptid_get_lwp (lp->ptid)))
+ {
+ thread_dead = 1;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "WL: Thread group leader %s vanished.\n",
+ target_pid_to_str (lp->ptid));
+ break;
+ }
+
+ /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers
+ get invoked despite our caller had them intentionally blocked by
+ block_child_signals. This is sensitive only to the loop of
+ linux_nat_wait_1 and there if we get called my_waitpid gets called
+ again before it gets to sigsuspend so we can safely let the handlers
+ get executed here. */
+
+ sigsuspend (&suspend_mask);
}
+ restore_child_signals_mask (&prev_mask);
+
if (!thread_dead)
{
- gdb_assert (pid == GET_LWP (lp->ptid));
+ gdb_assert (pid == ptid_get_lwp (lp->ptid));
if (debug_linux_nat)
{
target_pid_to_str (lp->ptid),
status_to_str (status));
}
- }
- /* Check if the thread has exited. */
- if (WIFEXITED (status) || WIFSIGNALED (status))
- {
- thread_dead = 1;
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
- target_pid_to_str (lp->ptid));
+ /* Check if the thread has exited. */
+ if (WIFEXITED (status) || WIFSIGNALED (status))
+ {
+ thread_dead = 1;
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
+ target_pid_to_str (lp->ptid));
+ }
}
if (thread_dead)
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)
{
return status;
}
-/* Save the most recent siginfo for LP. This is currently only called
- for SIGTRAP; some ports use the si_addr field for
- target_stopped_data_address. In the future, it may also be used to
- restore the siginfo of requeued signals. */
-
-static void
-save_siginfo (struct lwp_info *lp)
-{
- errno = 0;
- ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
- (PTRACE_TYPE_ARG3) 0, &lp->siginfo);
-
- if (errno != 0)
- memset (&lp->siginfo, 0, sizeof (lp->siginfo));
-}
-
/* Send a SIGSTOP to LP. */
static int
target_pid_to_str (lp->ptid));
}
errno = 0;
- ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP);
+ ret = kill_lwp (ptid_get_lwp (lp->ptid), SIGSTOP);
if (debug_linux_nat)
{
fprintf_unfiltered (gdb_stdlog,
return 0;
}
-/* Wait until LP is stopped. If DATA is non-null it is interpreted as
- a pointer to a set of signals to be flushed immediately. */
+/* Request a stop on LWP. */
-static int
-stop_wait_callback (struct lwp_info *lp, void *data)
+void
+linux_stop_lwp (struct lwp_info *lwp)
{
- sigset_t *flush_mask = data;
-
- if (!lp->stopped)
- {
- int status;
-
- status = wait_lwp (lp);
- if (status == 0)
- return 0;
-
- /* Ignore any signals in FLUSH_MASK. */
- if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
- {
- if (!lp->signalled)
- {
- lp->stopped = 1;
- return 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)\n",
- target_pid_to_str (lp->ptid),
- errno ? safe_strerror (errno) : "OK");
+ stop_callback (lwp, NULL);
+}
- return stop_wait_callback (lp, flush_mask);
- }
+/* Return non-zero if LWP PID has a pending SIGINT. */
- 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.
-
- 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);
-
- /* Now resume this LWP and get the SIGSTOP event. */
- 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)\n",
- target_pid_to_str (lp->ptid),
- errno ? safe_strerror (errno) : "OK");
-
- fprintf_unfiltered (gdb_stdlog,
- "SWC: Candidate SIGTRAP event in %s\n",
- target_pid_to_str (lp->ptid));
- }
- /* Hold this event/waitstatus while we check to see if
- there are any more (we still want to get that SIGSTOP). */
- stop_wait_callback (lp, data);
+static int
+linux_nat_has_pending_sigint (int pid)
+{
+ sigset_t pending, blocked, ignored;
- if (target_can_async_p ())
- {
- /* 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: kill %s, %s\n",
- target_pid_to_str (lp->ptid),
- status_to_str ((int) status));
- kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
- }
- }
- 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;
- }
- return 0;
- }
- else
- {
- /* The thread was stopped with a signal other than
- SIGSTOP, and didn't accidentally trip a breakpoint. */
+ linux_proc_pending_signals (pid, &pending, &blocked, &ignored);
- if (debug_linux_nat)
- {
- fprintf_unfiltered (gdb_stdlog,
- "SWC: Pending event %s in %s\n",
- status_to_str ((int) status),
- target_pid_to_str (lp->ptid));
- }
- /* Now resume this LWP and get the SIGSTOP event. */
- errno = 0;
- ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
- target_pid_to_str (lp->ptid),
- errno ? safe_strerror (errno) : "OK");
-
- /* Hold this event/waitstatus while we check to see if
- there are any more (we still want to get that SIGSTOP). */
- stop_wait_callback (lp, data);
-
- /* 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 (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 (status));
- }
- else
- lp->status = status;
- return 0;
- }
- }
- else
- {
- /* We caught the SIGSTOP that we intended to catch, so
- there's no SIGSTOP pending. */
- lp->stopped = 1;
- lp->signalled = 0;
- }
- }
+ if (sigismember (&pending, SIGINT)
+ && !sigismember (&ignored, SIGINT))
+ return 1;
return 0;
}
-/* Check whether PID has any pending signals in FLUSH_MASK. If so set
- the appropriate bits in PENDING, and return 1 - otherwise return 0. */
+/* Set a flag in LP indicating that we should ignore its next SIGINT. */
static int
-linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask)
+set_ignore_sigint (struct lwp_info *lp, void *data)
{
- sigset_t blocked, ignored;
- int i;
-
- linux_proc_pending_signals (pid, pending, &blocked, &ignored);
+ /* If a thread has a pending SIGINT, consume it; otherwise, set a
+ flag to consume the next one. */
+ if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status)
+ && WSTOPSIG (lp->status) == SIGINT)
+ lp->status = 0;
+ else
+ lp->ignore_sigint = 1;
- if (!flush_mask)
- return 0;
+ return 0;
+}
- for (i = 1; i < NSIG; i++)
- if (sigismember (pending, i))
- if (!sigismember (flush_mask, i)
- || sigismember (&blocked, i)
- || sigismember (&ignored, i))
- sigdelset (pending, i);
+/* If LP does not have a SIGINT pending, then clear the ignore_sigint flag.
+ This function is called after we know the LWP has stopped; if the LWP
+ stopped before the expected SIGINT was delivered, then it will never have
+ arrived. Also, if the signal was delivered to a shared queue and consumed
+ by a different thread, it will never be delivered to this LWP. */
- if (sigisemptyset (pending))
- return 0;
+static void
+maybe_clear_ignore_sigint (struct lwp_info *lp)
+{
+ if (!lp->ignore_sigint)
+ return;
- return 1;
+ if (!linux_nat_has_pending_sigint (ptid_get_lwp (lp->ptid)))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "MCIS: Clearing bogus flag for %s\n",
+ target_pid_to_str (lp->ptid));
+ lp->ignore_sigint = 0;
+ }
}
-/* DATA is interpreted as a mask of signals to flush. If LP has
- signals pending, and they are all in the flush mask, then arrange
- to flush them. LP should be stopped, as should all other threads
- it might share a signal queue with. */
+/* 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
-flush_callback (struct lwp_info *lp, void *data)
+static void
+save_sigtrap (struct lwp_info *lp)
{
- sigset_t *flush_mask = data;
- sigset_t pending, intersection, blocked, ignored;
- int pid, status;
-
- /* Normally, when an LWP exits, it is removed from the LWP list. The
- last LWP isn't removed till later, however. So if there is only
- one LWP on the list, make sure it's alive. */
- if (lwp_list == lp && lp->next == NULL)
- if (!linux_nat_thread_alive (lp->ptid))
- return 0;
-
- /* Just because the LWP is stopped doesn't mean that new signals
- can't arrive from outside, so this function must be careful of
- race conditions. However, because all threads are stopped, we
- can assume that the pending mask will not shrink unless we resume
- the LWP, and that it will then get another signal. We can't
- control which one, however. */
+ struct cleanup *old_chain;
- if (lp->status)
+ if (linux_ops->to_stopped_by_watchpoint == NULL)
{
- if (debug_linux_nat)
- printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status);
- if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status)))
- lp->status = 0;
+ lp->stopped_by_watchpoint = 0;
+ return;
}
- /* While there is a pending signal we would like to flush, continue
- the inferior and collect another signal. But if there's already
- a saved status that we don't want to flush, we can't resume the
- inferior - if it stopped for some other reason we wouldn't have
- anywhere to save the new status. In that case, we must leave the
- signal unflushed (and possibly generate an extra SIGINT stop).
- That's much less bad than losing a signal. */
- while (lp->status == 0
- && linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
- {
- int ret;
-
- errno = 0;
- ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stderr,
- "FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno);
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = lp->ptid;
- lp->stopped = 0;
- stop_wait_callback (lp, flush_mask);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stderr,
- "FC: Wait finished; saved status is %d\n",
- lp->status);
+ lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint ();
+
+ 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 0;
+ do_cleanups (old_chain);
}
-/* Return non-zero if LP has a wait status pending. */
+/* See save_sigtrap. */
static int
-status_callback (struct lwp_info *lp, void *data)
+linux_nat_stopped_by_watchpoint (void)
{
- /* Only report a pending wait status if we pretend that this has
- indeed been resumed. */
- return (lp->status != 0 && lp->resumed);
-}
+ struct lwp_info *lp = find_lwp_pid (inferior_ptid);
-/* Return non-zero if LP isn't stopped. */
+ gdb_assert (lp != NULL);
-static int
-running_callback (struct lwp_info *lp, void *data)
-{
- return (lp->stopped == 0 || (lp->status != 0 && lp->resumed));
+ return lp->stopped_by_watchpoint;
}
-/* Count the LWP's that have had events. */
-
static int
-count_events_callback (struct lwp_info *lp, void *data)
+linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p)
{
- int *count = data;
+ struct lwp_info *lp = find_lwp_pid (inferior_ptid);
- gdb_assert (count != NULL);
+ gdb_assert (lp != NULL);
- /* Count only LWPs that have a SIGTRAP event pending. */
- if (lp->status != 0
- && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
- (*count)++;
+ *addr_p = lp->stopped_data_address;
- return 0;
+ return lp->stopped_data_address_p;
}
-/* Select the LWP (if any) that is currently being single-stepped. */
+/* 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 (ptid_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, ptid_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)
+ {
+ /* The thread was stopped with a signal other than SIGSTOP. */
+
+ save_sigtrap (lp);
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SWC: Pending event %s in %s\n",
+ status_to_str ((int) status),
+ target_pid_to_str (lp->ptid));
+
+ /* Save the sigtrap event. */
+ lp->status = status;
+ gdb_assert (!lp->stopped);
+ gdb_assert (lp->signalled);
+ lp->stopped = 1;
+ }
+ else
+ {
+ /* We caught the SIGSTOP that we intended to catch, so
+ there's no SIGSTOP pending. */
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SWC: Delayed SIGSTOP caught for %s.\n",
+ target_pid_to_str (lp->ptid));
+
+ lp->stopped = 1;
+
+ /* Reset SIGNALLED only after the stop_wait_callback call
+ above as it does gdb_assert on SIGNALLED. */
+ lp->signalled = 0;
+ }
+ }
+
+ return 0;
+}
+
+/* Return non-zero if LP has a wait status pending. */
+
+static int
+status_callback (struct lwp_info *lp, void *data)
+{
+ /* Only report a pending wait status if we pretend that this has
+ indeed been 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 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. */
+
+static int
+running_callback (struct lwp_info *lp, void *data)
+{
+ return (!lp->stopped
+ || ((lp->status != 0
+ || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
+ && lp->resumed));
+}
+
+/* Count the LWP's that have had events. */
+
+static int
+count_events_callback (struct lwp_info *lp, void *data)
+{
+ int *count = data;
+
+ gdb_assert (count != NULL);
+
+ /* Count only resumed LWPs that have a SIGTRAP event pending. */
+ if (lp->resumed && linux_nat_lp_status_is_event (lp))
+ (*count)++;
+
+ return 0;
+}
+
+/* Select the LWP (if any) that is currently being single-stepped. */
static int
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
{
- if (lp->step && lp->status != 0)
+ if (lp->last_resume_kind == resume_step
+ && lp->status != 0)
return 1;
else
return 0;
gdb_assert (selector != NULL);
- /* Select only LWPs that have a SIGTRAP event pending. */
- if (lp->status != 0
- && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
+ /* Select only resumed LWPs that have a SIGTRAP event pending. */
+ if (lp->resumed && linux_nat_lp_status_is_event (lp))
if ((*selector)-- == 0)
return 1;
struct gdbarch *gdbarch = get_regcache_arch (regcache);
CORE_ADDR pc;
- pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch);
- if (breakpoint_inserted_here_p (pc))
+ pc = regcache_read_pc (regcache) - target_decr_pc_after_break (gdbarch);
+ if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
target_pid_to_str (lp->ptid));
/* Back up the PC if necessary. */
- if (gdbarch_decr_pc_after_break (gdbarch))
+ if (target_decr_pc_after_break (gdbarch))
regcache_write_pc (regcache, pc);
return 1;
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);
}
return lp->resumed;
}
-/* Stop an active thread, verify it still exists, then resume it. */
+/* Stop an active thread, verify it still exists, then resume it. If
+ the thread ends up with a pending status, then it is not resumed,
+ and *DATA (really a pointer to int), is set. */
static int
stop_and_resume_callback (struct lwp_info *lp, void *data)
{
- struct lwp_info *ptr;
+ int *new_pending_p = data;
- if (!lp->stopped && !lp->signalled)
+ if (!lp->stopped)
{
+ ptid_t ptid = lp->ptid;
+
stop_callback (lp, NULL);
stop_wait_callback (lp, NULL);
- /* Resume if the lwp still exists. */
- for (ptr = lwp_list; ptr; ptr = ptr->next)
- if (lp == ptr)
- {
- resume_callback (lp, NULL);
- resume_set_callback (lp, NULL);
- }
+
+ /* Resume if the lwp still exists, and the core wanted it
+ running. */
+ lp = find_lwp_pid (ptid);
+ if (lp != NULL)
+ {
+ if (lp->last_resume_kind == resume_stop
+ && lp->status == 0)
+ {
+ /* The core wanted the LWP to stop. Even if it stopped
+ cleanly (with SIGSTOP), leave the event pending. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SARC: core wanted LWP %ld stopped "
+ "(leaving SIGSTOP pending)\n",
+ ptid_get_lwp (lp->ptid));
+ lp->status = W_STOPCODE (SIGSTOP);
+ }
+
+ if (lp->status == 0)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SARC: re-resuming LWP %ld\n",
+ ptid_get_lwp (lp->ptid));
+ resume_lwp (lp, lp->step, GDB_SIGNAL_0);
+ }
+ else
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "SARC: not re-resuming LWP %ld "
+ "(has pending)\n",
+ ptid_get_lwp (lp->ptid));
+ if (new_pending_p)
+ *new_pending_p = 1;
+ }
+ }
}
return 0;
}
/* Check if we should go on and pass this event to common code.
- Return the affected lwp if we are, or NULL otherwise. */
+ Return the affected lwp if we are, or NULL otherwise. If we stop
+ all lwps temporarily, we may end up with new pending events in some
+ other lwp. In that case set *NEW_PENDING_P to true. */
+
static struct lwp_info *
-linux_nat_filter_event (int lwpid, int status, int options)
+linux_nat_filter_event (int lwpid, int status, int *new_pending_p)
{
struct lwp_info *lp;
+ *new_pending_p = 0;
+
lp = find_lwp_pid (pid_to_ptid (lwpid));
/* Check for stop events reported by a process we didn't already
fork, vfork, and clone events, then we'll just add the
new one to our list and go back to waiting for the event
to be reported - the stopped process might be returned
- from waitpid before or after the event is. */
+ from waitpid before or after the event is.
+
+ But note the case of a non-leader thread exec'ing after the
+ leader having exited, and gone from our lists. The non-leader
+ thread changes its tid to the tgid. */
+
+ if (WIFSTOPPED (status) && lp == NULL
+ && (WSTOPSIG (status) == SIGTRAP && status >> 16 == PTRACE_EVENT_EXEC))
+ {
+ /* A multi-thread exec after we had seen the leader exiting. */
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: Re-adding thread group leader LWP %d.\n",
+ lwpid);
+
+ lp = add_lwp (ptid_build (lwpid, lwpid, 0));
+ lp->stopped = 1;
+ lp->resumed = 1;
+ add_thread (lp->ptid);
+ }
+
if (WIFSTOPPED (status) && !lp)
{
- linux_record_stopped_pid (lwpid, status);
+ add_to_pid_list (&stopped_pids, lwpid, status);
return NULL;
}
/* Make sure we don't report an event for the exit of an LWP not in
- our list, i.e. not part of the current process. This can happen
- if we detach from a program we original forked and then it
+ our list, i.e. not part of the current process. This can happen
+ if we detach from a program we originally forked and then it
exits. */
if (!WIFSTOPPED (status) && !lp)
return NULL;
- /* NOTE drow/2003-06-17: This code seems to be meant for debugging
- CLONE_PTRACE processes which do not use the thread library -
- otherwise we wouldn't find the new LWP this way. That doesn't
- currently work, and the following code is currently unreachable
- due to the two blocks above. If it's fixed some day, this code
- should be broken out into a function so that we can also pick up
- LWPs from the new interface. */
- if (!lp)
+ /* Handle GNU/Linux's syscall SIGTRAPs. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP)
{
- lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
- if (options & __WCLONE)
- lp->cloned = 1;
-
- gdb_assert (WIFSTOPPED (status)
- && WSTOPSIG (status) == SIGSTOP);
- lp->signalled = 1;
-
- if (!in_thread_list (inferior_ptid))
- {
- inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
- GET_PID (inferior_ptid));
- add_thread (inferior_ptid);
- }
-
- add_thread (lp->ptid);
+ /* 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;
}
- /* Save the trap's siginfo in case we need it later. */
- if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
- save_siginfo (lp);
-
/* 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_sigtrap (lp);
+
/* Check if the thread has exited. */
- if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
+ if ((WIFEXITED (status) || WIFSIGNALED (status))
+ && num_lwps (ptid_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
should be ignored or whether it means the end of the debugged
application, regardless of which threading model is being
used. */
- if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
+ if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid))
{
lp->stopped = 1;
- iterate_over_lwps (stop_and_resume_callback, NULL);
+ iterate_over_lwps (pid_to_ptid (ptid_get_pid (lp->ptid)),
+ stop_and_resume_callback, new_pending_p);
}
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)
- {
- /* Make sure there is at least one thread running. */
- gdb_assert (iterate_over_lwps (running_callback, NULL));
-
- /* Discard the event. */
- return NULL;
- }
+ if (num_lwps (ptid_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 (ptid_get_pid (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid))
{
+ ptid_t ptid = pid_to_ptid (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;
"LLW: Delayed SIGSTOP caught for %s.\n",
target_pid_to_str (lp->ptid));
- /* This is a delayed SIGSTOP. */
lp->signalled = 0;
- registers_changed ();
+ if (lp->last_resume_kind != resume_stop)
+ {
+ /* This is a delayed SIGSTOP. */
+
+ registers_changed ();
+
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops,
+ pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ lp->step, GDB_SIGNAL_0);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
+ lp->step ?
+ "PTRACE_SINGLESTEP" : "PTRACE_CONT",
+ target_pid_to_str (lp->ptid));
+
+ lp->stopped = 0;
+ gdb_assert (lp->resumed);
+
+ /* Discard the event. */
+ return NULL;
+ }
+ }
+
+ /* Make sure we don't report a SIGINT that we have already displayed
+ for another thread. */
+ if (lp->ignore_sigint
+ && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LLW: Delayed SIGINT caught for %s.\n",
+ target_pid_to_str (lp->ptid));
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
- lp->step, TARGET_SIGNAL_0);
+ /* This is a delayed SIGINT. */
+ lp->ignore_sigint = 0;
+
+ registers_changed ();
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops, pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ lp->step, GDB_SIGNAL_0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
- "LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
+ "LLW: %s %s, 0, 0 (discard SIGINT)\n",
lp->step ?
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
target_pid_to_str (lp->ptid));
/* 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. */
+/* Detect zombie thread group leaders, and "exit" them. We can't reap
+ their exits until all other threads in the group have exited. */
static void
-pipe_to_local_event_queue (void)
+check_zombie_leaders (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)
+ struct inferior *inf;
+
+ ALL_INFERIORS (inf)
{
- int lwpid, status, options;
- lwpid = linux_nat_event_pipe_pop (&status, &options);
- gdb_assert (lwpid > 0);
- push_waitpid (lwpid, status, options);
- }
-}
+ struct lwp_info *leader_lp;
-/* Get the unprocessed events stored in the local queue back into the
- pipe, so the event loop realizes there's something else to
- process. */
+ if (inf->pid == 0)
+ continue;
-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;
+ leader_lp = find_lwp_pid (pid_to_ptid (inf->pid));
+ if (leader_lp != NULL
+ /* Check if there are other threads in the group, as we may
+ have raced with the inferior simply exiting. */
+ && num_lwps (inf->pid) > 1
+ && linux_proc_pid_is_zombie (inf->pid))
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "CZL: Thread group leader %d zombie "
+ "(it exited, or another thread execd).\n",
+ inf->pid);
+
+ /* A leader zombie can mean one of two things:
+
+ - It exited, and there's an exit status pending
+ available, or only the leader exited (not the whole
+ program). In the latter case, we can't waitpid the
+ leader's exit status until all other threads are gone.
+
+ - There are 3 or more threads in the group, and a thread
+ other than the leader exec'd. On an exec, the Linux
+ kernel destroys all other threads (except the execing
+ one) in the thread group, and resets the execing thread's
+ tid to the tgid. No exit notification is sent for the
+ execing thread -- from the ptracer's perspective, it
+ appears as though the execing thread just vanishes.
+ Until we reap all other threads except the leader and the
+ execing thread, the leader will be zombie, and the
+ execing thread will be in `D (disc sleep)'. As soon as
+ all other threads are reaped, the execing thread changes
+ it's tid to the tgid, and the previous (zombie) leader
+ vanishes, giving place to the "new" leader. We could try
+ distinguishing the exit and exec cases, by waiting once
+ more, and seeing if something comes out, but it doesn't
+ sound useful. The previous leader _does_ go away, and
+ we'll re-add the new one once we see the exec event
+ (which is just the same as what would happen if the
+ previous leader did exit voluntarily before some other
+ thread execs). */
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog,
- "LEQTP: linux_nat_num_queued_events(%d)\n",
- linux_nat_num_queued_events);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "CZL: Thread group leader %d vanished.\n",
+ inf->pid);
+ exit_lwp (leader_lp);
+ }
+ }
}
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)
{
- struct lwp_info *lp = NULL;
- int options = 0;
- int status = 0;
- pid_t pid = PIDGET (ptid);
- sigset_t flush_mask;
+ static sigset_t prev_mask;
+ enum resume_kind last_resume_kind;
+ struct lwp_info *lp;
+ int status;
- if (debug_linux_nat_async)
+ if (debug_linux_nat)
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,
+ ptid_build (ptid_get_pid (inferior_ptid),
+ ptid_get_pid (inferior_ptid), 0));
- inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
- GET_PID (inferior_ptid));
- lp = add_lwp (inferior_ptid);
+ lp = add_initial_lwp (inferior_ptid);
lp->resumed = 1;
- /* Add the main thread to GDB's thread list. */
- add_thread_silent (lp->ptid);
}
- sigemptyset (&flush_mask);
-
- /* Block events while we're here. */
- linux_nat_async_events (sigchld_sync);
+ /* Make sure SIGCHLD is blocked until the sigsuspend below. */
+ block_child_signals (&prev_mask);
retry:
-
- /* Make sure there is at least one LWP that has been resumed. */
- gdb_assert (iterate_over_lwps (resumed_callback, NULL));
+ lp = NULL;
+ status = 0;
/* First check if there is a LWP with a wait status pending. */
- if (pid == -1)
+ if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))
{
- /* Any LWP that's been resumed will do. */
- lp = iterate_over_lwps (status_callback, NULL);
+ /* Any LWP in the PTID group that's been resumed will do. */
+ 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. */
- options = __WCLONE | WNOHANG;
}
- else if (is_lwp (ptid))
+ else if (ptid_lwp_p (ptid))
{
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
/* 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),
- target_pid_to_str (lp->ptid));
-
- /* If we have to wait, take into account whether PID is a cloned
- process or not. And we have to convert it to something that
- the layer beneath us can understand. */
- options = lp->cloned ? __WCLONE : 0;
- pid = GET_LWP (ptid);
- }
-
- if (status && lp->signalled)
- {
- /* A pending SIGSTOP may interfere with the normal stream of
- events. In a typical case where interference is a problem,
- we have a SIGSTOP signal pending for LWP A while
- single-stepping it, encounter an event in LWP B, and take the
- pending SIGSTOP while trying to stop LWP A. After processing
- the event in LWP B, LWP A is continued, and we'll never see
- the SIGTRAP associated with the last time we were
- single-stepping LWP A. */
-
- /* Resume the thread. It should halt immediately returning the
- pending SIGSTOP. */
- registers_changed ();
- linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
- lp->step, TARGET_SIGNAL_0);
- if (debug_linux_nat)
- fprintf_unfiltered (gdb_stdlog,
- "LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
- lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
+ status_to_str (lp->status),
target_pid_to_str (lp->ptid));
- lp->stopped = 0;
- gdb_assert (lp->resumed);
- /* This should catch the pending SIGSTOP. */
- stop_wait_callback (lp, NULL);
+ /* 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 (!target_can_async_p ())
{
/* Causes SIGINT to be passed on to the attached process. */
set_sigint_trap ();
- set_sigio_trap ();
}
- while (status == 0)
+ /* But if we don't find a pending event, we'll have to wait. */
+
+ 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);
+ /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace
+ quirks:
+
+ - If the thread group leader exits while other threads in the
+ thread group still exist, waitpid(TGID, ...) hangs. That
+ waitpid won't return an exit status until the other threads
+ in the group are reapped.
+
+ - When a non-leader thread execs, that thread just vanishes
+ without reporting an exit (so we'd hang if we waited for it
+ explicitly in that case). The exec event is reported to
+ the TGID pid. */
+
+ errno = 0;
+ lwpid = my_waitpid (-1, &status, __WCLONE | WNOHANG);
+ if (lwpid == 0 || (lwpid == -1 && errno == ECHILD))
+ lwpid = my_waitpid (-1, &status, WNOHANG);
+
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNW: waitpid(-1, ...) returned %d, %s\n",
+ lwpid, errno ? safe_strerror (errno) : "ERRNO-OK");
if (lwpid > 0)
{
- gdb_assert (pid == -1 || lwpid == pid);
+ /* If this is true, then we paused LWPs momentarily, and may
+ now have pending events to handle. */
+ int new_pending;
if (debug_linux_nat)
{
(long) lwpid, status_to_str (status));
}
- lp = linux_nat_filter_event (lwpid, status, options);
- if (!lp)
- {
- /* A discarded event. */
- status = 0;
- continue;
- }
-
- break;
- }
+ lp = linux_nat_filter_event (lwpid, status, &new_pending);
- if (pid == -1)
- {
- /* Alternate between checking cloned and uncloned processes. */
- options ^= __WCLONE;
+ /* STATUS is now no longer valid, use LP->STATUS instead. */
+ status = 0;
- /* And every time we have checked both:
- In async mode, return to event loop;
- In sync mode, suspend waiting for a SIGCHLD signal. */
- if (options & __WCLONE)
+ if (lp && !ptid_match (lp->ptid, ptid))
{
- if (target_can_async_p ())
- {
- /* No interesting event. */
- ourstatus->kind = TARGET_WAITKIND_IGNORE;
-
- /* Get ready for the next event. */
- target_async (inferior_event_handler, 0);
+ gdb_assert (lp->resumed);
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n");
+ if (debug_linux_nat)
+ fprintf (stderr,
+ "LWP %ld got an event %06x, leaving pending.\n",
+ ptid_get_lwp (lp->ptid), lp->status);
- return minus_one_ptid;
+ 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;
+ }
+
+ if (new_pending)
+ {
+ /* Some LWP now has a pending event. Go all the way
+ back to check it. */
+ goto retry;
+ }
- sigsuspend (&suspend_mask);
+ if (lp)
+ {
+ /* We got an event to report to the core. */
+ break;
}
+
+ /* Retry until nothing comes out of waitpid. A single
+ SIGCHLD can indicate more than one child stopped. */
+ continue;
+ }
+
+ /* Check for zombie thread group leaders. Those can't be reaped
+ until all other threads in the thread group are. */
+ check_zombie_leaders ();
+
+ /* If there are no resumed children left, bail. We'd be stuck
+ forever in the sigsuspend call below otherwise. */
+ if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n");
+
+ ourstatus->kind = TARGET_WAITKIND_NO_RESUMED;
+
+ if (!target_can_async_p ())
+ clear_sigint_trap ();
+
+ restore_child_signals_mask (&prev_mask);
+ return minus_one_ptid;
+ }
+
+ /* No interesting event to report to the core. */
+
+ if (target_options & TARGET_WNOHANG)
+ {
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n");
+
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+ 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);
+
+ /* Block until we get an event reported with SIGCHLD. */
+ sigsuspend (&suspend_mask);
}
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 gdb_signal signo = gdb_signal_from_host (WSTOPSIG (status));
- /* If we get a signal while single-stepping, we may need special
- care, e.g. to skip the signal handler. Defer to common code. */
+ /* When using hardware single-step, we need to report every signal.
+ Otherwise, signals in pass_mask may be short-circuited. */
if (!lp->step
- && signal_stop_state (signo) == 0
- && signal_print_state (signo) == 0
- && signal_pass_state (signo) == 1)
+ && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status)))
{
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
here? It is not clear we should. GDB may not expect
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)),
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops,
+ pid_to_ptid (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 != GDB_SIGNAL_0
+ ? strsignal (gdb_signal_to_host (signo))
+ : "0"));
lp->stopped = 0;
- status = 0;
goto retry;
}
- if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
+ if (!non_stop)
{
- /* If ^C/BREAK is typed at the tty/console, SIGINT gets
- forwarded to the entire process group, that is, all LWP's
- will receive it. Since we only want to report it once,
- we try to flush it from all LWPs except this one. */
- sigaddset (&flush_mask, SIGINT);
+ /* Only do the below in all-stop, as we currently use SIGINT
+ to implement target_stop (see linux_nat_stop) in
+ non-stop. */
+ if (signo == GDB_SIGNAL_INT && signal_pass_state (signo) == 0)
+ {
+ /* If ^C/BREAK is typed at the tty/console, SIGINT gets
+ forwarded to the entire process group, that is, all LWPs
+ 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 (pid_to_ptid (ptid_get_pid (ptid)),
+ set_ignore_sigint, NULL);
+ lp->ignore_sigint = 0;
+ }
+ else
+ maybe_clear_ignore_sigint (lp);
}
}
fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n",
status_to_str (status), target_pid_to_str (lp->ptid));
- /* Now stop all other LWP's ... */
- iterate_over_lwps (stop_callback, NULL);
-
- /* ... and wait until all of them have reported back that they're no
- longer running. */
- iterate_over_lwps (stop_wait_callback, &flush_mask);
- iterate_over_lwps (flush_callback, &flush_mask);
-
- /* 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);
-
- /* 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);
+ if (!non_stop)
+ {
+ /* Now stop all other LWP's ... */
+ 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 (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 (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))
+ 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);
+
+ /* We'll need this to determine whether to report a SIGSTOP as
+ TARGET_WAITKIND_0. Need to take a copy because
+ resume_clear_callback clears it. */
+ last_resume_kind = lp->last_resume_kind;
+
+ /* 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
+ {
+ /* See above. */
+ last_resume_kind = lp->last_resume_kind;
+ resume_clear_callback (lp, NULL);
+ }
- 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);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog, "LLW: exit\n");
+
+ restore_child_signals_mask (&prev_mask);
+
+ if (last_resume_kind == resume_stop
+ && ourstatus->kind == TARGET_WAITKIND_STOPPED
+ && WSTOPSIG (status) == SIGSTOP)
+ {
+ /* A thread that has been requested to stop by GDB with
+ target_stop, and it stopped cleanly, so report as SIG0. The
+ use of SIGSTOP is an implementation detail. */
+ ourstatus->value.sig = GDB_SIGNAL_0;
+ }
+
+ if (ourstatus->kind == TARGET_WAITKIND_EXITED
+ || ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
+ lp->core = -1;
+ else
+ lp->core = linux_common_core_of_thread (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)
+ {
+ struct regcache *regcache = get_thread_regcache (lp->ptid);
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR pc = regcache_read_pc (regcache);
+
+ 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))
+ {
+ 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 at %s: step=%d\n",
+ target_pid_to_str (lp->ptid),
+ paddress (gdbarch, pc),
+ lp->step);
+
+ registers_changed ();
+ if (linux_nat_prepare_to_resume != NULL)
+ linux_nat_prepare_to_resume (lp);
+ linux_ops->to_resume (linux_ops, pid_to_ptid (ptid_get_lwp (lp->ptid)),
+ lp->step, GDB_SIGNAL_0);
+ lp->stopped = 0;
+ 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)
+ {
+ char *options_string;
+
+ options_string = target_options_to_string (target_options);
+ fprintf_unfiltered (gdb_stdlog,
+ "linux_nat_wait: [%s], [%s]\n",
+ target_pid_to_str (ptid),
+ options_string);
+ xfree (options_string);
+ }
+
+ /* 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
+ && ourstatus->kind != TARGET_WAITKIND_NO_RESUMED)
+ || !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);
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "LLW: exit\n");
-
- return lp->ptid;
+ return event_ptid;
}
static int
kill_callback (struct lwp_info *lp, void *data)
{
+ /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */
+
+ errno = 0;
+ kill (ptid_get_lwp (lp->ptid), SIGKILL);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "KC: kill (SIGKILL) %s, 0, 0 (%s)\n",
+ target_pid_to_str (lp->ptid),
+ errno ? safe_strerror (errno) : "OK");
+
+ /* Some kernels ignore even SIGKILL for processes under ptrace. */
+
errno = 0;
- ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
+ ptrace (PTRACE_KILL, ptid_get_lwp (lp->ptid), 0, 0);
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"KC: PTRACE_KILL %s, 0, 0 (%s)\n",
{
do
{
- pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
+ pid = my_waitpid (ptid_get_lwp (lp->ptid), NULL, __WCLONE);
if (pid != (pid_t) -1)
{
if (debug_linux_nat)
kill_callback (lp, NULL);
}
}
- while (pid == GET_LWP (lp->ptid));
+ while (pid == ptid_get_lwp (lp->ptid));
gdb_assert (pid == -1 && errno == ECHILD);
}
do
{
- pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0);
+ pid = my_waitpid (ptid_get_lwp (lp->ptid), NULL, 0);
if (pid != (pid_t) -1)
{
if (debug_linux_nat)
kill_callback (lp, NULL);
}
}
- while (pid == GET_LWP (lp->ptid));
+ while (pid == ptid_get_lwp (lp->ptid));
gdb_assert (pid == -1 && errno == ECHILD);
return 0;
}
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 (last.kind == TARGET_WAITKIND_FORKED
|| last.kind == TARGET_WAITKIND_VFORKED)
{
- ptrace (PT_KILL, last.value.related_pid, 0, 0);
+ ptrace (PT_KILL, ptid_get_pid (last.value.related_pid), 0, 0);
wait (&status);
+
+ /* Let the arch-specific native code know this process is
+ gone. */
+ linux_nat_forget_process (ptid_get_pid (last.value.related_pid));
}
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 (ptid, stop_callback, NULL);
+ /* ... and wait until all of them have reported back that
+ they're no longer running. */
+ 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 ();
+ int pid = ptid_get_pid (inferior_ptid);
+
+ purge_lwp_list (pid);
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
one and context-switch to the first available. */
linux_fork_mourn_inferior ();
+
+ /* Let the arch-specific native code know this process is gone. */
+ linux_nat_forget_process (pid);
}
-static LONGEST
+/* Convert a native/host siginfo object, into/from the siginfo in the
+ layout of the inferiors' architecture. */
+
+static void
+siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo, int direction)
+{
+ 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 (siginfo_t));
+ else
+ memcpy (inf_siginfo, siginfo, sizeof (siginfo_t));
+ }
+}
+
+static enum target_xfer_status
+linux_xfer_siginfo (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
+{
+ int pid;
+ siginfo_t siginfo;
+ gdb_byte inf_siginfo[sizeof (siginfo_t)];
+
+ gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO);
+ gdb_assert (readbuf || writebuf);
+
+ pid = ptid_get_lwp (inferior_ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (inferior_ptid);
+
+ if (offset > sizeof (siginfo))
+ return TARGET_XFER_E_IO;
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo);
+ if (errno != 0)
+ return TARGET_XFER_E_IO;
+
+ /* 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 TARGET_XFER_E_IO;
+ }
+
+ *xfered_len = len;
+ return TARGET_XFER_OK;
+}
+
+static enum target_xfer_status
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)
+ ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
{
- struct cleanup *old_chain = save_inferior_ptid ();
- LONGEST xfer;
+ struct cleanup *old_chain;
+ enum target_xfer_status xfer;
+
+ if (object == TARGET_OBJECT_SIGNAL_INFO)
+ return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf,
+ offset, len, xfered_len);
- if (is_lwp (inferior_ptid))
- inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
+ /* 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 TARGET_XFER_EOF;
+
+ old_chain = save_inferior_ptid ();
+
+ if (ptid_lwp_p (inferior_ptid))
+ inferior_ptid = pid_to_ptid (ptid_get_lwp (inferior_ptid));
xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf,
- offset, len);
+ offset, len, xfered_len);
do_cleanups (old_chain);
return xfer;
}
static int
-linux_nat_thread_alive (ptid_t ptid)
+linux_thread_alive (ptid_t ptid)
{
- gdb_assert (is_lwp (ptid));
+ int err, tmp_errno;
- errno = 0;
- ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
+ gdb_assert (ptid_lwp_p (ptid));
+
+ /* Send signal 0 instead of anything ptrace, because ptracing a
+ running thread errors out claiming that the thread doesn't
+ exist. */
+ err = kill_lwp (ptid_get_lwp (ptid), 0);
+ tmp_errno = errno;
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
- "LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n",
+ "LLTA: KILL(SIG0) %s (%s)\n",
target_pid_to_str (ptid),
- errno ? safe_strerror (errno) : "OK");
+ err ? safe_strerror (tmp_errno) : "OK");
- /* Not every Linux kernel implements PTRACE_PEEKUSER. But we can
- handle that case gracefully since ptrace will first do a lookup
- for the process based upon the passed-in pid. If that fails we
- will get either -ESRCH or -EPERM, otherwise the child exists and
- is alive. */
- if (errno == ESRCH || errno == EPERM)
+ if (err != 0)
return 0;
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)))
+ if (ptid_lwp_p (ptid)
+ && (ptid_get_pid (ptid) != ptid_get_lwp (ptid)
+ || num_lwps (ptid_get_pid (ptid)) > 1))
{
- snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
+ snprintf (buf, sizeof (buf), "LWP %ld", ptid_get_lwp (ptid));
return buf;
}
return normal_pid_to_str (ptid);
}
-static void
-sigchld_handler (int signo)
+static char *
+linux_nat_thread_name (struct thread_info *thr)
{
- if (linux_nat_async_enabled
- && 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");
+ int pid = ptid_get_pid (thr->ptid);
+ long lwp = ptid_get_lwp (thr->ptid);
+#define FORMAT "/proc/%d/task/%ld/comm"
+ char buf[sizeof (FORMAT) + 30];
+ FILE *comm_file;
+ char *result = NULL;
+
+ snprintf (buf, sizeof (buf), FORMAT, pid, lwp);
+ comm_file = gdb_fopen_cloexec (buf, "r");
+ if (comm_file)
+ {
+ /* Not exported by the kernel, so we define it here. */
+#define COMM_LEN 16
+ static char line[COMM_LEN + 1];
+
+ if (fgets (line, sizeof (line), comm_file))
+ {
+ char *nl = strchr (line, '\n');
- /* 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. */
+ if (nl)
+ *nl = '\0';
+ if (*line != '\0')
+ result = line;
+ }
+
+ fclose (comm_file);
+ }
+
+#undef COMM_LEN
+#undef FORMAT
+
+ return result;
}
/* Accepts an integer PID; Returns a string representing a file that
{
char *name1, *name2;
- name1 = xmalloc (MAXPATHLEN);
- name2 = xmalloc (MAXPATHLEN);
+ name1 = xmalloc (PATH_MAX);
+ name2 = xmalloc (PATH_MAX);
make_cleanup (xfree, name1);
make_cleanup (xfree, name2);
- memset (name2, 0, MAXPATHLEN);
+ memset (name2, 0, PATH_MAX);
- sprintf (name1, "/proc/%d/exe", pid);
- if (readlink (name1, name2, MAXPATHLEN) > 0)
+ xsnprintf (name1, PATH_MAX, "/proc/%d/exe", pid);
+ if (readlink (name1, name2, PATH_MAX - 1) > 0)
return name2;
else
return name1;
}
-/* Service function for corefiles and info proc. */
-
-static int
-read_mapping (FILE *mapfile,
- long long *addr,
- long long *endaddr,
- char *permissions,
- long long *offset,
- char *device, long long *inode, char *filename)
-{
- int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx",
- addr, endaddr, permissions, offset, device, inode);
-
- filename[0] = '\0';
- if (ret > 0 && ret != EOF)
- {
- /* Eat everything up to EOL for the filename. This will prevent
- weird filenames (such as one with embedded whitespace) from
- confusing this code. It also makes this code more robust in
- respect to annotations the kernel may add after the filename.
-
- Note the filename is used for informational purposes
- only. */
- ret += fscanf (mapfile, "%[^\n]\n", filename);
- }
-
- return (ret != 0 && ret != EOF);
-}
-
-/* Fills the "to_find_memory_regions" target vector. Lists the memory
- 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)
-{
- long long 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;
-
- /* Compose the filename for the /proc memory map, and open it. */
- sprintf (mapsfilename, "/proc/%lld/maps", pid);
- if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
- error (_("Could not open %s."), mapsfilename);
-
- if (info_verbose)
- fprintf_filtered (gdb_stdout,
- "Reading memory regions from %s\n", mapsfilename);
-
- /* Now iterate until end-of-file. */
- while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0],
- &offset, &device[0], &inode, &filename[0]))
- {
- size = endaddr - addr;
-
- /* Get the segment's permissions. */
- read = (strchr (permissions, 'r') != 0);
- write = (strchr (permissions, 'w') != 0);
- exec = (strchr (permissions, 'x') != 0);
-
- if (info_verbose)
- {
- fprintf_filtered (gdb_stdout,
- "Save segment, %lld bytes at 0x%s (%c%c%c)",
- size, paddr_nz (addr),
- read ? 'r' : ' ',
- write ? 'w' : ' ', exec ? 'x' : ' ');
- if (filename[0])
- fprintf_filtered (gdb_stdout, " for %s", filename);
- fprintf_filtered (gdb_stdout, "\n");
- }
-
- /* Invoke the callback function to create the corefile
- segment. */
- func (addr, size, read, write, exec, obfd);
- }
- fclose (mapsfile);
- return 0;
-}
-
/* Records the thread's register state for the corefile note
section. */
static char *
-linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid,
- char *note_data, int *note_size)
+linux_nat_collect_thread_registers (const struct regcache *regcache,
+ ptid_t ptid, bfd *obfd,
+ char *note_data, int *note_size,
+ enum gdb_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);
const struct regset *regset;
int core_regset_p;
- struct cleanup *old_chain;
- struct core_regset_section *sect_list;
- char *gdb_regset;
-
- old_chain = save_inferior_ptid ();
- inferior_ptid = ptid;
- target_fetch_registers (regcache, -1);
- do_cleanups (old_chain);
+ gdb_gregset_t gregs;
+ gdb_fpregset_t fpregs;
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));
+ 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
- structurally the same, so they can benefit from the new struct. */
- 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_assert (regset && regset->collect_regset);
- 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);
- xfree (gdb_regset);
- sect_list++;
- }
+ note_data = (char *) elfcore_write_prstatus
+ (obfd, note_data, note_size, ptid_get_lwp (ptid),
+ gdb_signal_to_host (stop_signal), &gregs);
- /* For architectures that does not have the struct core_regset_section
- implemented, we use the old method. When all the architectures have
- the new support, the code below should be deleted. */
+ if (core_regset_p
+ && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
+ sizeof (fpregs)))
+ != NULL && regset->collect_regset != NULL)
+ regset->collect_regset (regset, regcache, -1, &fpregs, sizeof (fpregs));
else
- {
- if (core_regset_p
- && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
- sizeof (fpregs))) != NULL
- && regset->collect_regset != NULL)
- regset->collect_regset (regset, regcache, -1,
- &fpregs, sizeof (fpregs));
- else
- fill_fpregset (regcache, &fpregs, -1);
+ fill_fpregset (regcache, &fpregs, -1);
- note_data = (char *) elfcore_write_prfpreg (obfd,
- note_data,
- note_size,
- &fpregs, sizeof (fpregs));
- }
+ note_data = (char *) elfcore_write_prfpreg (obfd, note_data, note_size,
+ &fpregs, sizeof (fpregs));
return note_data;
}
-struct linux_nat_corefile_thread_data
+/* Fills the "to_make_corefile_note" target vector. Builds the note
+ section for a corefile, and returns it in a malloc buffer. */
+
+static char *
+linux_nat_make_corefile_notes (bfd *obfd, int *note_size)
{
- bfd *obfd;
- char *note_data;
- int *note_size;
- int num_notes;
-};
+ /* FIXME: uweigand/2011-10-06: Once all GNU/Linux architectures have been
+ converted to gdbarch_core_regset_sections, this function can go away. */
+ return linux_make_corefile_notes (target_gdbarch (), obfd, note_size,
+ linux_nat_collect_thread_registers);
+}
-/* Called by gdbthread.c once per thread. Records the thread's
- register state for the corefile note section. */
+/* Implement the to_xfer_partial interface for memory reads using the /proc
+ filesystem. Because we can use a single read() call for /proc, this
+ can be much more efficient than banging away at PTRACE_PEEKTEXT,
+ but it doesn't support writes. */
-static int
-linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data)
+static enum target_xfer_status
+linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, LONGEST len, ULONGEST *xfered_len)
{
- struct linux_nat_corefile_thread_data *args = data;
+ LONGEST ret;
+ int fd;
+ char filename[64];
- args->note_data = linux_nat_do_thread_registers (args->obfd,
- ti->ptid,
- args->note_data,
- args->note_size);
- args->num_notes++;
+ if (object != TARGET_OBJECT_MEMORY || !readbuf)
+ return 0;
- return 0;
-}
+ /* Don't bother for one word. */
+ if (len < 3 * sizeof (long))
+ return TARGET_XFER_EOF;
-/* Records the register state for the corefile note section. */
+ /* We could keep this file open and cache it - possibly one per
+ thread. That requires some juggling, but is even faster. */
+ xsnprintf (filename, sizeof filename, "/proc/%d/mem",
+ ptid_get_pid (inferior_ptid));
+ fd = gdb_open_cloexec (filename, O_RDONLY | O_LARGEFILE, 0);
+ if (fd == -1)
+ return TARGET_XFER_EOF;
-static char *
-linux_nat_do_registers (bfd *obfd, ptid_t ptid,
- char *note_data, int *note_size)
-{
- return linux_nat_do_thread_registers (obfd,
- ptid_build (ptid_get_pid (inferior_ptid),
- ptid_get_pid (inferior_ptid),
- 0),
- note_data, note_size);
+ /* If pread64 is available, use it. It's faster if the kernel
+ supports it (only one syscall), and it's 64-bit safe even on
+ 32-bit platforms (for instance, SPARC debugging a SPARC64
+ application). */
+#ifdef HAVE_PREAD64
+ if (pread64 (fd, readbuf, len, offset) != len)
+#else
+ if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len)
+#endif
+ ret = 0;
+ else
+ ret = len;
+
+ close (fd);
+
+ if (ret == 0)
+ return TARGET_XFER_EOF;
+ else
+ {
+ *xfered_len = ret;
+ return TARGET_XFER_OK;
+ }
}
-/* Fills the "to_make_corefile_note" target vector. Builds the note
- section for a corefile, and returns it in a malloc buffer. */
-static char *
-linux_nat_make_corefile_notes (bfd *obfd, int *note_size)
+/* Enumerate spufs IDs for process PID. */
+static LONGEST
+spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, ULONGEST len)
{
- 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;
- gdb_byte *auxv;
- int auxv_len;
-
- if (get_exec_file (0))
+ 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)
{
- strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname));
- strncpy (psargs, get_exec_file (0), sizeof (psargs));
- if (get_inferior_args ())
+ 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)
{
- char *string_end;
- char *psargs_end = psargs + sizeof (psargs);
-
- /* linux_elfcore_write_prpsinfo () handles zero unterminated
- strings fine. */
- string_end = memchr (psargs, 0, sizeof (psargs));
- if (string_end != NULL)
- {
- *string_end++ = ' ';
- strncpy (string_end, get_inferior_args (),
- psargs_end - string_end);
- }
+ store_unsigned_integer (buf + pos - offset, 4, byte_order, fd);
+ written += 4;
}
- note_data = (char *) elfcore_write_prpsinfo (obfd,
- note_data,
- note_size, fname, psargs);
+ pos += 4;
}
- /* Dump information for threads. */
- thread_args.obfd = obfd;
- thread_args.note_data = note_data;
- thread_args.note_size = note_size;
- thread_args.num_notes = 0;
- iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args);
- if (thread_args.num_notes == 0)
- {
- /* iterate_over_threads didn't come up with any threads; just
- use inferior_ptid. */
- note_data = linux_nat_do_registers (obfd, inferior_ptid,
- note_data, note_size);
- }
- else
- {
- note_data = thread_args.note_data;
- }
-
- auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV,
- NULL, &auxv);
- if (auxv_len > 0)
- {
- note_data = elfcore_write_note (obfd, note_data, note_size,
- "CORE", NT_AUXV, auxv, auxv_len);
- xfree (auxv);
- }
-
- make_cleanup (xfree, note_data);
- return note_data;
+ closedir (dir);
+ return written;
}
-/* Implement the "info proc" command. */
+/* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU
+ object type, using the /proc file system. */
-static void
-linux_nat_info_proc_cmd (char *args, int from_tty)
+static enum target_xfer_status
+linux_proc_xfer_spu (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf,
+ ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
{
- long long pid = PIDGET (inferior_ptid);
- FILE *procfile;
- char **argv = NULL;
- char buffer[MAXPATHLEN];
- char fname1[MAXPATHLEN], fname2[MAXPATHLEN];
- int cmdline_f = 1;
- 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;
- struct stat dummy;
-
- if (args)
- {
- /* Break up 'args' into an argv array. */
- if ((argv = buildargv (args)) == NULL)
- nomem (0);
- else
- make_cleanup_freeargv (argv);
- }
- while (argv != NULL && *argv != NULL)
- {
- if (isdigit (argv[0][0]))
- {
- pid = strtoul (argv[0], NULL, 10);
- }
- else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0)
- {
- mappings_f = 1;
- }
- else if (strcmp (argv[0], "status") == 0)
- {
- status_f = 1;
- }
- else if (strcmp (argv[0], "stat") == 0)
- {
- stat_f = 1;
- }
- else if (strcmp (argv[0], "cmd") == 0)
- {
- cmdline_f = 1;
- }
- else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0)
- {
- exe_f = 1;
- }
- else if (strcmp (argv[0], "cwd") == 0)
- {
- cwd_f = 1;
- }
- else if (strncmp (argv[0], "all", strlen (argv[0])) == 0)
- {
- all = 1;
- }
- else
- {
- /* [...] (future options here) */
- }
- argv++;
- }
- if (pid == 0)
- error (_("No current process: you must name one."));
+ char buf[128];
+ int fd = 0;
+ int ret = -1;
+ int pid = ptid_get_pid (inferior_ptid);
- sprintf (fname1, "/proc/%lld", pid);
- if (stat (fname1, &dummy) != 0)
- error (_("No /proc directory: '%s'"), fname1);
-
- printf_filtered (_("process %lld\n"), pid);
- if (cmdline_f || all)
- {
- sprintf (fname1, "/proc/%lld/cmdline", pid);
- if ((procfile = fopen (fname1, "r")) != NULL)
- {
- fgets (buffer, sizeof (buffer), procfile);
- printf_filtered ("cmdline = '%s'\n", buffer);
- fclose (procfile);
- }
- else
- warning (_("unable to open /proc file '%s'"), fname1);
- }
- if (cwd_f || all)
+ if (!annex)
{
- sprintf (fname1, "/proc/%lld/cwd", pid);
- memset (fname2, 0, sizeof (fname2));
- if (readlink (fname1, fname2, sizeof (fname2)) > 0)
- printf_filtered ("cwd = '%s'\n", fname2);
+ if (!readbuf)
+ return TARGET_XFER_E_IO;
else
- warning (_("unable to read link '%s'"), fname1);
- }
- if (exe_f || all)
- {
- sprintf (fname1, "/proc/%lld/exe", pid);
- memset (fname2, 0, sizeof (fname2));
- if (readlink (fname1, fname2, sizeof (fname2)) > 0)
- printf_filtered ("exe = '%s'\n", fname2);
- else
- warning (_("unable to read link '%s'"), fname1);
- }
- if (mappings_f || all)
- {
- sprintf (fname1, "/proc/%lld/maps", pid);
- if ((procfile = fopen (fname1, "r")) != NULL)
{
- long long addr, endaddr, size, offset, inode;
- char permissions[8], device[8], filename[MAXPATHLEN];
+ LONGEST l = spu_enumerate_spu_ids (pid, readbuf, offset, len);
- printf_filtered (_("Mapped address spaces:\n\n"));
- if (gdbarch_addr_bit (current_gdbarch) == 32)
- {
- printf_filtered ("\t%10s %10s %10s %10s %7s\n",
- "Start Addr",
- " End Addr",
- " Size", " Offset", "objfile");
- }
+ if (l < 0)
+ return TARGET_XFER_E_IO;
+ else if (l == 0)
+ return TARGET_XFER_EOF;
else
- {
- printf_filtered (" %18s %18s %10s %10s %7s\n",
- "Start Addr",
- " End Addr",
- " Size", " Offset", "objfile");
- }
-
- while (read_mapping (procfile, &addr, &endaddr, &permissions[0],
- &offset, &device[0], &inode, &filename[0]))
{
- size = endaddr - addr;
-
- /* FIXME: carlton/2003-08-27: Maybe the printf_filtered
- calls here (and possibly above) should be abstracted
- out into their own functions? Andrew suggests using
- a generic local_address_string instead to print out
- the addresses; that makes sense to me, too. */
-
- if (gdbarch_addr_bit (current_gdbarch) == 32)
- {
- printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
- (unsigned long) addr, /* FIXME: pr_addr */
- (unsigned long) endaddr,
- (int) size,
- (unsigned int) offset,
- filename[0] ? filename : "");
- }
- else
- {
- printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
- (unsigned long) addr, /* FIXME: pr_addr */
- (unsigned long) endaddr,
- (int) size,
- (unsigned int) offset,
- filename[0] ? filename : "");
- }
+ *xfered_len = (ULONGEST) l;
+ return TARGET_XFER_OK;
}
-
- fclose (procfile);
}
- else
- warning (_("unable to open /proc file '%s'"), fname1);
}
- if (status_f || all)
- {
- sprintf (fname1, "/proc/%lld/status", pid);
- if ((procfile = fopen (fname1, "r")) != NULL)
- {
- while (fgets (buffer, sizeof (buffer), procfile) != NULL)
- puts_filtered (buffer);
- fclose (procfile);
- }
- else
- warning (_("unable to open /proc file '%s'"), fname1);
- }
- if (stat_f || all)
- {
- sprintf (fname1, "/proc/%lld/stat", pid);
- if ((procfile = fopen (fname1, "r")) != NULL)
- {
- int itmp;
- char ctmp;
- long ltmp;
-
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("Process: %d\n"), itmp);
- if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0)
- printf_filtered (_("Exec file: %s\n"), buffer);
- if (fscanf (procfile, "%c ", &ctmp) > 0)
- printf_filtered (_("State: %c\n"), ctmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("Parent process: %d\n"), itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("Process group: %d\n"), itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("Session id: %d\n"), itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("TTY: %d\n"), itmp);
- if (fscanf (procfile, "%d ", &itmp) > 0)
- printf_filtered (_("TTY owner process group: %d\n"), itmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Flags: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Minor faults (no memory page): %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Minor faults, children: %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Major faults (memory page faults): %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Major faults, children: %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("utime: %ld\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("stime: %ld\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("utime, children: %ld\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("stime, children: %ld\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
- ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("'nice' value: %ld\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("jiffies until next timeout: %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("start time (jiffies since system boot): %ld\n"),
- ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Virtual memory size: %lu\n"),
- (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Start of text: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("End of text: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0)
- printf_filtered (_("Start of stack: 0x%lx\n"), ltmp);
-#if 0 /* Don't know how architecture-dependent the rest is...
- Anyway the signal bitmap info is available from "status". */
- if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
- printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
- printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%ld ", <mp) > 0)
- printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp);
- if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
- printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
-#endif
- fclose (procfile);
- }
- else
- warning (_("unable to open /proc file '%s'"), fname1);
- }
-}
-
-/* Implement the to_xfer_partial interface for memory reads using the /proc
- filesystem. Because we can use a single read() call for /proc, this
- can be much more efficient than banging away at PTRACE_PEEKTEXT,
- but it doesn't support writes. */
-static LONGEST
-linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
- const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf,
- ULONGEST offset, LONGEST len)
-{
- LONGEST ret;
- int fd;
- char filename[64];
+ xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex);
+ fd = gdb_open_cloexec (buf, writebuf? O_WRONLY : O_RDONLY, 0);
+ if (fd <= 0)
+ return TARGET_XFER_E_IO;
- if (object != TARGET_OBJECT_MEMORY || !readbuf)
- return 0;
+ if (offset != 0
+ && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
+ {
+ close (fd);
+ return TARGET_XFER_EOF;
+ }
- /* Don't bother for one word. */
- if (len < 3 * sizeof (long))
- return 0;
+ if (writebuf)
+ ret = write (fd, writebuf, (size_t) len);
+ else if (readbuf)
+ ret = read (fd, readbuf, (size_t) len);
- /* We could keep this file open and cache it - possibly one per
- thread. That requires some juggling, but is even faster. */
- sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid));
- fd = open (filename, O_RDONLY | O_LARGEFILE);
- if (fd == -1)
- return 0;
+ close (fd);
- /* If pread64 is available, use it. It's faster if the kernel
- supports it (only one syscall), and it's 64-bit safe even on
- 32-bit platforms (for instance, SPARC debugging a SPARC64
- application). */
-#ifdef HAVE_PREAD64
- if (pread64 (fd, readbuf, len, offset) != len)
-#else
- if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len)
-#endif
- ret = 0;
+ if (ret < 0)
+ return TARGET_XFER_E_IO;
+ else if (ret == 0)
+ return TARGET_XFER_EOF;
else
- ret = len;
-
- close (fd);
- return ret;
+ {
+ *xfered_len = (ULONGEST) ret;
+ return TARGET_XFER_OK;
+ }
}
+
/* Parse LINE as a signal set and add its set bits to SIGS. */
static void
SIGS to match. */
void
-linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored)
+linux_proc_pending_signals (int pid, sigset_t *pending,
+ sigset_t *blocked, sigset_t *ignored)
{
FILE *procfile;
- char buffer[MAXPATHLEN], fname[MAXPATHLEN];
- int signum;
+ char buffer[PATH_MAX], fname[PATH_MAX];
+ struct cleanup *cleanup;
sigemptyset (pending);
sigemptyset (blocked);
sigemptyset (ignored);
- sprintf (fname, "/proc/%d/status", pid);
- procfile = fopen (fname, "r");
+ xsnprintf (fname, sizeof fname, "/proc/%d/status", pid);
+ procfile = gdb_fopen_cloexec (fname, "r");
if (procfile == NULL)
error (_("Could not open %s"), fname);
+ cleanup = make_cleanup_fclose (procfile);
- while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
+ while (fgets (buffer, PATH_MAX, procfile) != NULL)
{
/* Normal queued signals are on the SigPnd line in the status
file. However, 2.6 kernels also have a "shared" pending
add_line_to_sigset (buffer + 8, ignored);
}
- fclose (procfile);
+ do_cleanups (cleanup);
}
-static LONGEST
+static enum target_xfer_status
+linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object,
+ const char *annex, gdb_byte *readbuf,
+ const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
+{
+ gdb_assert (object == TARGET_OBJECT_OSDATA);
+
+ *xfered_len = linux_common_xfer_osdata (annex, readbuf, offset, len);
+ if (*xfered_len == 0)
+ return TARGET_XFER_EOF;
+ else
+ return TARGET_XFER_OK;
+}
+
+static enum target_xfer_status
linux_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
- const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
+ const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+ ULONGEST *xfered_len)
{
- LONGEST xfer;
+ enum target_xfer_status xfer;
if (object == TARGET_OBJECT_AUXV)
- return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
- offset, len);
+ return memory_xfer_auxv (ops, object, annex, readbuf, writebuf,
+ offset, len, xfered_len);
+
+ if (object == TARGET_OBJECT_OSDATA)
+ return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf,
+ offset, len, xfered_len);
+
+ if (object == TARGET_OBJECT_SPU)
+ return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf,
+ offset, len, xfered_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)
+ offset, len, xfered_len);
+ if (xfer != TARGET_XFER_EOF)
return xfer;
return super_xfer_partial (ops, object, annex, readbuf, writebuf,
- offset, len);
+ offset, len, xfered_len);
+}
+
+static void
+cleanup_target_stop (void *arg)
+{
+ ptid_t *ptid = (ptid_t *) arg;
+
+ gdb_assert (arg != NULL);
+
+ /* Unpause all */
+ target_resume (*ptid, 0, GDB_SIGNAL_0);
+}
+
+static VEC(static_tracepoint_marker_p) *
+linux_child_static_tracepoint_markers_by_strid (const char *strid)
+{
+ char s[IPA_CMD_BUF_SIZE];
+ struct cleanup *old_chain;
+ int pid = ptid_get_pid (inferior_ptid);
+ VEC(static_tracepoint_marker_p) *markers = NULL;
+ struct static_tracepoint_marker *marker = NULL;
+ char *p = s;
+ ptid_t ptid = ptid_build (pid, 0, 0);
+
+ /* Pause all */
+ target_stop (ptid);
+
+ memcpy (s, "qTfSTM", sizeof ("qTfSTM"));
+ s[sizeof ("qTfSTM")] = 0;
+
+ agent_run_command (pid, s, strlen (s) + 1);
+
+ old_chain = make_cleanup (free_current_marker, &marker);
+ make_cleanup (cleanup_target_stop, &ptid);
+
+ while (*p++ == 'm')
+ {
+ if (marker == NULL)
+ marker = XCNEW (struct static_tracepoint_marker);
+
+ do
+ {
+ parse_static_tracepoint_marker_definition (p, &p, marker);
+
+ if (strid == NULL || strcmp (strid, marker->str_id) == 0)
+ {
+ VEC_safe_push (static_tracepoint_marker_p,
+ markers, marker);
+ marker = NULL;
+ }
+ else
+ {
+ release_static_tracepoint_marker (marker);
+ memset (marker, 0, sizeof (*marker));
+ }
+ }
+ while (*p++ == ','); /* comma-separated list */
+
+ memcpy (s, "qTsSTM", sizeof ("qTsSTM"));
+ s[sizeof ("qTsSTM")] = 0;
+ agent_run_command (pid, s, strlen (s) + 1);
+ p = s;
+ }
+
+ do_cleanups (old_chain);
+
+ return markers;
}
/* Create a prototype generic GNU/Linux target. The client can override
linux_target_install_ops (struct target_ops *t)
{
t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint;
+ t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint;
t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint;
+ t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint;
t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint;
+ t->to_remove_exec_catchpoint = linux_child_remove_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;
t->to_follow_fork = linux_child_follow_fork;
- t->to_find_memory_regions = linux_nat_find_memory_regions;
t->to_make_corefile_notes = linux_nat_make_corefile_notes;
super_xfer_partial = t->to_xfer_partial;
t->to_xfer_partial = linux_xfer_partial;
+
+ t->to_static_tracepoint_markers_by_strid
+ = linux_child_static_tracepoint_markers_by_strid;
}
struct target_ops *
return t;
}
-/* Controls if async mode is permitted. */
-static int linux_async_permitted = 0;
-
-/* The set command writes to this variable. If the inferior is
- executing, linux_nat_async_permitted is *not* updated. */
-static int linux_async_permitted_1 = 0;
-
-static void
-set_maintenance_linux_async_permitted (char *args, int from_tty,
- struct cmd_list_element *c)
-{
- if (target_has_execution)
- {
- linux_async_permitted_1 = linux_async_permitted;
- error (_("Cannot change this setting while the inferior is running."));
- }
-
- linux_async_permitted = linux_async_permitted_1;
- linux_nat_set_async_mode (linux_async_permitted);
-}
-
-static void
-show_maintenance_linux_async_permitted (struct ui_file *file, int from_tty,
- struct cmd_list_element *c, const char *value)
-{
- fprintf_filtered (file, _("\
-Controlling the GNU/Linux inferior in asynchronous mode is %s.\n"),
- value);
-}
-
/* target_is_async_p implementation. */
static int
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 linux-async" command.
+ it explicitly with the "set target-async" command.
Someday, linux will always be async. */
- if (!linux_async_permitted)
- return 0;
-
- return 1;
+ return target_async_permitted;
}
/* 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 linux-async" command.
+ it explicitly with the "set target-async" command.
Someday, linux will always be async. */
- if (!linux_async_permitted)
- return 0;
-
- /* See target.h/target_async_mask. */
- return linux_nat_async_mask_value;
-}
-
-/* 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;
+ return target_async_permitted;
}
-/* Pop an event from the event pipe. */
-
static int
-linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options)
+linux_nat_supports_non_stop (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;
-}
-
-/* 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++;
+ return 1;
}
-static void
-get_pending_events (void)
-{
- int status, options, pid;
-
- if (!linux_nat_async_enabled
- || linux_nat_async_events_state != sigchld_async)
- internal_error (__FILE__, __LINE__,
- "get_pending_events called with async masked");
-
- while (1)
- {
- status = 0;
- options = __WCLONE | WNOHANG;
-
- do
- {
- pid = waitpid (-1, &status, options);
- }
- while (pid == -1 && errno == EINTR);
-
- if (pid <= 0)
- {
- options = WNOHANG;
- do
- {
- pid = waitpid (-1, &status, options);
- }
- while (pid == -1 && errno == EINTR);
- }
-
- if (pid <= 0)
- /* No more children reporting events. */
- break;
+/* True if we want to support multi-process. To be removed when GDB
+ supports multi-exec. */
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "\
-get_pending_events: pid(%d), status(%x), options (%x)\n",
- pid, status, options);
+int linux_multi_process = 1;
- 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)
+static int
+linux_nat_supports_multi_process (void)
{
- if (debug_linux_nat_async)
- fprintf_unfiltered (gdb_stdlog, "async_sigchld_handler\n");
-
- get_pending_events ();
+ return linux_multi_process;
}
-/* Set SIGCHLD handling state to STATE. Returns previous state. */
-
-static enum sigchld_state
-linux_nat_async_events (enum sigchld_state state)
+static int
+linux_nat_supports_disable_randomization (void)
{
- 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)
- {
- 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);
-
- /* 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;
- }
- }
-
- return current_state;
+#ifdef HAVE_PERSONALITY
+ return 1;
+#else
+ return 0;
+#endif
}
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
-linux_nat_async_file_handler (int error, gdb_client_data client_data)
+sigchld_handler (int signo)
+{
+ int old_errno = errno;
+
+ if (debug_linux_nat)
+ ui_file_write_async_safe (gdb_stdlog,
+ "sigchld\n", sizeof ("sigchld\n") - 1);
+
+ 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
+handle_target_event (int error, gdb_client_data client_data)
+{
+ (*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)
{
- async_client_callback (INF_REG_EVENT, async_client_context);
+ int previous = (linux_nat_event_pipe[0] != -1);
+
+ if (previous != enable)
+ {
+ sigset_t prev_mask;
+
+ /* Block child signals while we create/destroy the pipe, as
+ their handler writes to it. */
+ block_child_signals (&prev_mask);
+
+ if (enable)
+ {
+ if (gdb_pipe_cloexec (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. */
linux_nat_async (void (*callback) (enum inferior_event_type event_type,
void *context), void *context)
{
- if (linux_nat_async_mask_value == 0 || !linux_nat_async_enabled)
- internal_error (__FILE__, __LINE__,
- "Calling target_async when async is masked");
-
if (callback != NULL)
{
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;
}
-/* Enable/Disable async mode. */
+/* Stop an LWP, and push a GDB_SIGNAL_0 stop status if no other
+ event came out. */
-static void
-linux_nat_set_async_mode (int on)
+static int
+linux_nat_stop_lwp (struct lwp_info *lwp, void *data)
{
- if (linux_nat_async_enabled != on)
+ if (!lwp->stopped)
{
- if (on)
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "LNSL: running -> suspending %s\n",
+ target_pid_to_str (lwp->ptid));
+
+
+ if (lwp->last_resume_kind == resume_stop)
{
- gdb_assert (waitpid_queue == NULL);
- 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);
+ if (debug_linux_nat)
+ fprintf_unfiltered (gdb_stdlog,
+ "linux-nat: already stopping LWP %ld at "
+ "GDB's request\n",
+ ptid_get_lwp (lwp->ptid));
+ return 0;
}
- else
- {
- drain_queued_events (-1);
- linux_nat_num_queued_events = 0;
- close (linux_nat_event_pipe[0]);
- close (linux_nat_event_pipe[1]);
- linux_nat_event_pipe[0] = linux_nat_event_pipe[1] = -1;
+ stop_callback (lwp, NULL);
+ lwp->last_resume_kind = resume_stop;
+ }
+ else
+ {
+ /* Already known to be stopped; do nothing. */
+
+ if (debug_linux_nat)
+ {
+ 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,
+ "LNSL: already stopped/no "
+ "stop_requested yet %s\n",
+ target_pid_to_str (lwp->ptid));
}
}
- linux_nat_async_enabled = on;
+ return 0;
+}
+
+static void
+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 (void)
+{
+ /* Unregister from the event loop. */
+ if (linux_nat_is_async_p ())
+ linux_nat_async (NULL, 0);
+
+ if (linux_ops->to_close)
+ linux_ops->to_close ();
+}
+
+/* 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. */
+
+static 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 = ptid_get_lwp (ptid);
+ if (ptid_get_lwp (ptid) == 0)
+ {
+ /* An (lwpid,0,0) ptid. Look up the lwp object to get at the
+ tgid. */
+ lwp = find_lwp_pid (ptid);
+ pid = ptid_get_pid (lwp->ptid);
+ }
+ else
+ {
+ /* A (pid,lwpid,0) ptid. */
+ pid = ptid_get_pid (ptid);
+ }
+
+ inf = find_inferior_pid (pid);
+ gdb_assert (inf != NULL);
+ return inf->aspace;
+}
+
+/* Return the cached value of the processor core for thread PTID. */
+
+static 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_detach = linux_nat_detach;
t->to_resume = linux_nat_resume;
t->to_wait = linux_nat_wait;
+ t->to_pass_signals = linux_nat_pass_signals;
t->to_xfer_partial = linux_nat_xfer_partial;
t->to_kill = linux_nat_kill;
t->to_mourn_inferior = linux_nat_mourn_inferior;
t->to_thread_alive = linux_nat_thread_alive;
t->to_pid_to_str = linux_nat_pid_to_str;
+ t->to_thread_name = linux_nat_thread_name;
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_supports_non_stop = linux_nat_supports_non_stop;
t->to_async = linux_nat_async;
- 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_supports_disable_randomization
+ = linux_nat_supports_disable_randomization;
+
+ 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
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. */
void
-linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t))
+linux_nat_set_new_thread (struct target_ops *t,
+ void (*new_thread) (struct lwp_info *))
{
/* Save the pointer. We only support a single registered instance
of the GNU/Linux native target, so we do not need to map this to
linux_nat_new_thread = new_thread;
}
-/* Return the saved siginfo associated with PTID. */
-struct siginfo *
-linux_nat_get_siginfo (ptid_t ptid)
+/* See declaration in linux-nat.h. */
+
+void
+linux_nat_set_new_fork (struct target_ops *t,
+ linux_nat_new_fork_ftype *new_fork)
{
- struct lwp_info *lp = find_lwp_pid (ptid);
+ /* Save the pointer. */
+ linux_nat_new_fork = new_fork;
+}
- gdb_assert (lp != NULL);
+/* See declaration in linux-nat.h. */
- return &lp->siginfo;
+void
+linux_nat_set_forget_process (struct target_ops *t,
+ linux_nat_forget_process_ftype *fn)
+{
+ /* Save the pointer. */
+ linux_nat_forget_process_hook = fn;
}
+/* See declaration in linux-nat.h. */
+
void
-_initialize_linux_nat (void)
+linux_nat_forget_process (pid_t pid)
+{
+ if (linux_nat_forget_process_hook != NULL)
+ linux_nat_forget_process_hook (pid);
+}
+
+/* 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) (siginfo_t *,
+ gdb_byte *,
+ int))
+{
+ /* Save the pointer. */
+ linux_nat_siginfo_fixup = siginfo_fixup;
+}
+
+/* Register a method to call prior to resuming a thread. */
+
+void
+linux_nat_set_prepare_to_resume (struct target_ops *t,
+ void (*prepare_to_resume) (struct lwp_info *))
{
- sigset_t mask;
+ /* Save the pointer. */
+ linux_nat_prepare_to_resume = prepare_to_resume;
+}
+
+/* See linux-nat.h. */
- 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\
-Specify any of the following keywords for detailed info:\n\
- mappings -- list of mapped memory regions.\n\
- stat -- list a bunch of random process info.\n\
- status -- list a different bunch of random process info.\n\
- all -- list all available /proc info."));
+int
+linux_nat_get_siginfo (ptid_t ptid, siginfo_t *siginfo)
+{
+ int pid;
- add_setshow_zinteger_cmd ("lin-lwp", class_maintenance,
- &debug_linux_nat, _("\
+ pid = ptid_get_lwp (ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (ptid);
+
+ errno = 0;
+ ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, siginfo);
+ if (errno != 0)
+ {
+ memset (siginfo, 0, sizeof (*siginfo));
+ return 0;
+ }
+ return 1;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_linux_nat;
+
+void
+_initialize_linux_nat (void)
+{
+ add_setshow_zuinteger_cmd ("lin-lwp", class_maintenance,
+ &debug_linux_nat, _("\
Set debugging of GNU/Linux lwp module."), _("\
Show debugging of GNU/Linux lwp module."), _("\
Enables printf debugging output."),
- NULL,
- show_debug_linux_nat,
- &setdebuglist, &showdebuglist);
-
- add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance,
- &debug_linux_nat_async, _("\
-Set debugging of GNU/Linux async lwp module."), _("\
-Show debugging of GNU/Linux async lwp module."), _("\
-Enables printf debugging output."),
- NULL,
- show_debug_linux_nat_async,
- &setdebuglist, &showdebuglist);
-
- add_setshow_boolean_cmd ("linux-async", class_maintenance,
- &linux_async_permitted_1, _("\
-Set whether gdb controls the GNU/Linux inferior in asynchronous mode."), _("\
-Show whether gdb controls the GNU/Linux inferior in asynchronous mode."), _("\
-Tells gdb whether to control the GNU/Linux inferior in asynchronous mode."),
- set_maintenance_linux_async_permitted,
- show_maintenance_linux_async_permitted,
- &maintenance_set_cmdlist,
- &maintenance_show_cmdlist);
-
- /* 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);
+ NULL,
+ show_debug_linux_nat,
+ &setdebuglist, &showdebuglist);
/* 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;
-
- /* Install the default mode. */
- linux_nat_set_async_mode (linux_async_permitted);
+ sigemptyset (&blocked_mask);
}
\f
{
struct sigaction action;
int restart, cancel;
- sigset_t blocked_mask;
sigemptyset (&blocked_mask);
sigemptyset (set);
projects / deliverable / binutils-gdb.git / blobdiff