/* Multi-threaded debugging support for Linux (LWP layer).
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/* Multi-threaded debugging support for Linux (LWP layer).
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Copyright 2000, 2001 Free Software Foundation, Inc.
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Copyright 2000, 2001 Free Software Foundation, Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "defs.h"
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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#include <errno.h>
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#include <errno.h>
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#include <signal.h>
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#include <signal.h>
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#include <sys/ptrace.h>
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#include <sys/ptrace.h>
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#include "gdb_wait.h"
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#include "gdb_wait.h"
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#include "gdbthread.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "target.h"
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#include "target.h"
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#include "regcache.h"
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#include "regcache.h"
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#include "gdbcmd.h"
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#include "gdbcmd.h"
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static int debug_lin_lwp;
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static int debug_lin_lwp;
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extern const char *strsignal (int sig);
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extern const char *strsignal (int sig);
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/* On Linux there are no real LWP's. The closest thing to LWP's are
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/* On Linux there are no real LWP's. The closest thing to LWP's are
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processes sharing the same VM space. A multi-threaded process is
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processes sharing the same VM space. A multi-threaded process is
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basically a group of such processes. However, such a grouping is
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basically a group of such processes. However, such a grouping is
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almost entirely a user-space issue; the kernel doesn't enforce such
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almost entirely a user-space issue; the kernel doesn't enforce such
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a grouping at all (this might change in the future). In general,
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a grouping at all (this might change in the future). In general,
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we'll rely on the threads library (i.e. the LinuxThreads library)
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we'll rely on the threads library (i.e. the LinuxThreads library)
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to provide such a grouping.
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to provide such a grouping.
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It is perfectly well possible to write a multi-threaded application
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It is perfectly well possible to write a multi-threaded application
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without the assistance of a threads library, by using the clone
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without the assistance of a threads library, by using the clone
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system call directly. This module should be able to give some
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system call directly. This module should be able to give some
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rudimentary support for debugging such applications if developers
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rudimentary support for debugging such applications if developers
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specify the CLONE_PTRACE flag in the clone system call, and are
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specify the CLONE_PTRACE flag in the clone system call, and are
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using Linux 2.4 or above.
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using Linux 2.4 or above.
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Note that there are some peculiarities in Linux that affect this
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Note that there are some peculiarities in Linux that affect this
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code:
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code:
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- In general one should specify the __WCLONE flag to waitpid in
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- In general one should specify the __WCLONE flag to waitpid in
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order to make it report events for any of the cloned processes
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order to make it report events for any of the cloned processes
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(and leave it out for the initial process). However, if a cloned
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(and leave it out for the initial process). However, if a cloned
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process has exited the exit status is only reported if the
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process has exited the exit status is only reported if the
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__WCLONE flag is absent. Linux 2.4 has a __WALL flag, but we
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__WCLONE flag is absent. Linux 2.4 has a __WALL flag, but we
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cannot use it since GDB must work on older systems too.
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cannot use it since GDB must work on older systems too.
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- When a traced, cloned process exits and is waited for by the
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- When a traced, cloned process exits and is waited for by the
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debugger, the kernel reassigns it to the original parent and
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debugger, the kernel reassigns it to the original parent and
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keeps it around as a "zombie". Somehow, the LinuxThreads library
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keeps it around as a "zombie". Somehow, the LinuxThreads library
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doesn't notice this, which leads to the "zombie problem": When
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doesn't notice this, which leads to the "zombie problem": When
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debugged a multi-threaded process that spawns a lot of threads
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debugged a multi-threaded process that spawns a lot of threads
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will run out of processes, even if the threads exit, because the
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will run out of processes, even if the threads exit, because the
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"zombies" stay around. */
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"zombies" stay around. */
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/* Structure describing a LWP. */
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/* Structure describing a LWP. */
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struct lwp_info
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struct lwp_info
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{
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{
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/* The process id of the LWP. This is a combination of the LWP id
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/* The process id of the LWP. This is a combination of the LWP id
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and overall process id. */
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and overall process id. */
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ptid_t ptid;
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ptid_t ptid;
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/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
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/* Non-zero if we sent this LWP a SIGSTOP (but the LWP didn't report
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it back yet). */
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it back yet). */
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int signalled;
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int signalled;
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/* Non-zero if this LWP is stopped. */
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/* Non-zero if this LWP is stopped. */
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int stopped;
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int stopped;
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/* Non-zero if this LWP will be/has been resumed. Note that an LWP
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/* Non-zero if this LWP will be/has been resumed. Note that an LWP
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can be marked both as stopped and resumed at the same time. This
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can be marked both as stopped and resumed at the same time. This
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happens if we try to resume an LWP that has a wait status
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happens if we try to resume an LWP that has a wait status
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pending. We shouldn't let the LWP run until that wait status has
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pending. We shouldn't let the LWP run until that wait status has
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been processed, but we should not report that wait status if GDB
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been processed, but we should not report that wait status if GDB
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didn't try to let the LWP run. */
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didn't try to let the LWP run. */
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int resumed;
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int resumed;
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/* If non-zero, a pending wait status. */
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/* If non-zero, a pending wait status. */
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int status;
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int status;
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/* Non-zero if we were stepping this LWP. */
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/* Non-zero if we were stepping this LWP. */
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int step;
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int step;
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/* Next LWP in list. */
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/* Next LWP in list. */
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struct lwp_info *next;
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struct lwp_info *next;
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};
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};
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/* List of known LWPs. */
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/* List of known LWPs. */
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static struct lwp_info *lwp_list;
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static struct lwp_info *lwp_list;
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/* Number of LWPs in the list. */
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/* Number of LWPs in the list. */
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static int num_lwps;
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static int num_lwps;
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/* Non-zero if we're running in "threaded" mode. */
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/* Non-zero if we're running in "threaded" mode. */
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static int threaded;
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static int threaded;
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#define GET_LWP(ptid) ptid_get_lwp (ptid)
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#define GET_LWP(ptid) ptid_get_lwp (ptid)
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#define GET_PID(ptid) ptid_get_pid (ptid)
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#define GET_PID(ptid) ptid_get_pid (ptid)
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#define is_lwp(ptid) (GET_LWP (ptid) != 0)
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#define is_lwp(ptid) (GET_LWP (ptid) != 0)
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#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
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#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
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#define is_cloned(pid) (GET_LWP (pid) != GET_PID (pid))
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#define is_cloned(pid) (GET_LWP (pid) != GET_PID (pid))
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/* If the last reported event was a SIGTRAP, this variable is set to
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/* If the last reported event was a SIGTRAP, this variable is set to
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the process id of the LWP/thread that got it. */
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the process id of the LWP/thread that got it. */
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ptid_t trap_ptid;
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ptid_t trap_ptid;
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/* This module's target-specific operations. */
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/* This module's target-specific operations. */
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static struct target_ops lin_lwp_ops;
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static struct target_ops lin_lwp_ops;
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/* The standard child operations. */
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/* The standard child operations. */
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extern struct target_ops child_ops;
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extern struct target_ops child_ops;
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/* Since we cannot wait (in lin_lwp_wait) for the initial process and
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/* Since we cannot wait (in lin_lwp_wait) for the initial process and
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any cloned processes with a single call to waitpid, we have to use
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any cloned processes with a single call to waitpid, we have to use
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the WNOHANG flag and call waitpid in a loop. To optimize
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the WNOHANG flag and call waitpid in a loop. To optimize
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things a bit we use `sigsuspend' to wake us up when a process has
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things a bit we use `sigsuspend' to wake us up when a process has
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something to report (it will send us a SIGCHLD if it has). To make
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something to report (it will send us a SIGCHLD if it has). To make
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this work we have to juggle with the signal mask. We save the
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this work we have to juggle with the signal mask. We save the
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original signal mask such that we can restore it before creating a
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original signal mask such that we can restore it before creating a
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new process in order to avoid blocking certain signals in the
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new process in order to avoid blocking certain signals in the
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inferior. We then block SIGCHLD during the waitpid/sigsuspend
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inferior. We then block SIGCHLD during the waitpid/sigsuspend
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loop. */
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loop. */
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/* Original signal mask. */
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/* Original signal mask. */
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static sigset_t normal_mask;
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static sigset_t normal_mask;
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/* Signal mask for use with sigsuspend in lin_lwp_wait, initialized in
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/* Signal mask for use with sigsuspend in lin_lwp_wait, initialized in
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_initialize_lin_lwp. */
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_initialize_lin_lwp. */
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static sigset_t suspend_mask;
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static sigset_t suspend_mask;
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/* Signals to block to make that sigsuspend work. */
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/* Signals to block to make that sigsuspend work. */
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static sigset_t blocked_mask;
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static sigset_t blocked_mask;
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/* Prototypes for local functions. */
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/* Prototypes for local functions. */
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static int stop_wait_callback (struct lwp_info *lp, void *data);
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static int stop_wait_callback (struct lwp_info *lp, void *data);
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/* Initialize the list of LWPs. Note that this module, contrary to
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/* Initialize the list of LWPs. Note that this module, contrary to
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what GDB's generic threads layer does for its thread list,
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what GDB's generic threads layer does for its thread list,
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re-initializes the LWP lists whenever we mourn or detach (which
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re-initializes the LWP lists whenever we mourn or detach (which
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doesn't involve mourning) the inferior. */
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doesn't involve mourning) the inferior. */
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static void
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static void
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init_lwp_list (void)
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init_lwp_list (void)
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{
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{
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struct lwp_info *lp, *lpnext;
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struct lwp_info *lp, *lpnext;
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for (lp = lwp_list; lp; lp = lpnext)
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for (lp = lwp_list; lp; lp = lpnext)
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{
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{
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lpnext = lp->next;
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lpnext = lp->next;
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xfree (lp);
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xfree (lp);
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}
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}
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lwp_list = NULL;
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lwp_list = NULL;
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num_lwps = 0;
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num_lwps = 0;
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threaded = 0;
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threaded = 0;
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}
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}
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/* Add the LWP specified by PID to the list. If this causes the
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/* Add the LWP specified by PID to the list. If this causes the
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number of LWPs to become larger than one, go into "threaded" mode.
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number of LWPs to become larger than one, go into "threaded" mode.
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Return a pointer to the structure describing the new LWP. */
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Return a pointer to the structure describing the new LWP. */
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static struct lwp_info *
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static struct lwp_info *
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add_lwp (ptid_t ptid)
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add_lwp (ptid_t ptid)
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{
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{
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struct lwp_info *lp;
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struct lwp_info *lp;
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gdb_assert (is_lwp (ptid));
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gdb_assert (is_lwp (ptid));
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lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
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lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
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memset (lp, 0, sizeof (struct lwp_info));
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memset (lp, 0, sizeof (struct lwp_info));
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lp->ptid = ptid;
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lp->ptid = ptid;
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lp->next = lwp_list;
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lp->next = lwp_list;
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lwp_list = lp;
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lwp_list = lp;
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if (++num_lwps > 1)
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if (++num_lwps > 1)
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threaded = 1;
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threaded = 1;
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return lp;
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return lp;
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}
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}
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/* Remove the LWP specified by PID from the list. */
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/* Remove the LWP specified by PID from the list. */
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static void
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static void
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delete_lwp (ptid_t ptid)
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delete_lwp (ptid_t ptid)
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{
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{
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struct lwp_info *lp, *lpprev;
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struct lwp_info *lp, *lpprev;
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lpprev = NULL;
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lpprev = NULL;
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for (lp = lwp_list; lp; lpprev = lp, lp = lp->next)
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for (lp = lwp_list; lp; lpprev = lp, lp = lp->next)
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if (ptid_equal (lp->ptid, ptid))
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if (ptid_equal (lp->ptid, ptid))
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break;
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break;
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if (!lp)
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if (!lp)
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return;
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return;
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/* We don't go back to "non-threaded" mode if the number of threads
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/* We don't go back to "non-threaded" mode if the number of threads
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becomes less than two. */
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becomes less than two. */
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num_lwps--;
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num_lwps--;
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if (lpprev)
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if (lpprev)
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lpprev->next = lp->next;
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lpprev->next = lp->next;
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else
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else
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lwp_list = lp->next;
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lwp_list = lp->next;
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xfree (lp);
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xfree (lp);
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}
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}
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/* Return a pointer to the structure describing the LWP corresponding
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/* Return a pointer to the structure describing the LWP corresponding
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to PID. If no corresponding LWP could be found, return NULL. */
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to PID. If no corresponding LWP could be found, return NULL. */
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static struct lwp_info *
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static struct lwp_info *
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find_lwp_pid (ptid_t ptid)
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find_lwp_pid (ptid_t ptid)
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{
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{
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struct lwp_info *lp;
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struct lwp_info *lp;
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int lwp;
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int lwp;
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if (is_lwp (ptid))
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if (is_lwp (ptid))
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lwp = GET_LWP (ptid);
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lwp = GET_LWP (ptid);
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else
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else
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lwp = GET_PID (ptid);
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lwp = GET_PID (ptid);
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for (lp = lwp_list; lp; lp = lp->next)
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for (lp = lwp_list; lp; lp = lp->next)
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if (lwp == GET_LWP (lp->ptid))
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if (lwp == GET_LWP (lp->ptid))
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return lp;
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return lp;
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return NULL;
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return NULL;
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}
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}
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/* Call CALLBACK with its second argument set to DATA for every LWP in
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/* Call CALLBACK with its second argument set to DATA for every LWP in
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the list. If CALLBACK returns 1 for a particular LWP, return a
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the list. If CALLBACK returns 1 for a particular LWP, return a
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pointer to the structure describing that LWP immediately.
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pointer to the structure describing that LWP immediately.
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Otherwise return NULL. */
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Otherwise return NULL. */
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struct lwp_info *
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struct lwp_info *
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iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
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iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
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{
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{
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struct lwp_info *lp, *lpnext;
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struct lwp_info *lp, *lpnext;
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for (lp = lwp_list; lp; lp = lpnext)
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for (lp = lwp_list; lp; lp = lpnext)
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{
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{
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lpnext = lp->next;
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lpnext = lp->next;
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if ((*callback) (lp, data))
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if ((*callback) (lp, data))
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return lp;
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return lp;
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}
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}
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return NULL;
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return NULL;
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}
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}
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/* Implementation of the PREPARE_TO_PROCEED hook for the Linux LWP
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/* Implementation of the PREPARE_TO_PROCEED hook for the Linux LWP
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layer.
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layer.
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|
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Note that this implementation is potentially redundant now that
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Note that this implementation is potentially redundant now that
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default_prepare_to_proceed() has been added.
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default_prepare_to_proceed() has been added.
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FIXME This may not support switching threads after Ctrl-C
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FIXME This may not support switching threads after Ctrl-C
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correctly. The default implementation does support this. */
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correctly. The default implementation does support this. */
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int
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int
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lin_lwp_prepare_to_proceed (void)
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lin_lwp_prepare_to_proceed (void)
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{
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{
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if (! ptid_equal (trap_ptid, null_ptid)
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if (! ptid_equal (trap_ptid, null_ptid)
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&& ! ptid_equal (inferior_ptid, trap_ptid))
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&& ! ptid_equal (inferior_ptid, trap_ptid))
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{
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{
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/* Switched over from TRAP_PID. */
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/* Switched over from TRAP_PID. */
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CORE_ADDR stop_pc = read_pc ();
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CORE_ADDR stop_pc = read_pc ();
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CORE_ADDR trap_pc;
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CORE_ADDR trap_pc;
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/* Avoid switching where it wouldn't do any good, i.e. if both
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/* Avoid switching where it wouldn't do any good, i.e. if both
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threads are at the same breakpoint. */
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threads are at the same breakpoint. */
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trap_pc = read_pc_pid (trap_ptid);
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trap_pc = read_pc_pid (trap_ptid);
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if (trap_pc != stop_pc && breakpoint_here_p (trap_pc))
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if (trap_pc != stop_pc && breakpoint_here_p (trap_pc))
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{
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{
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/* User hasn't deleted the breakpoint. Return non-zero, and
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/* User hasn't deleted the breakpoint. Return non-zero, and
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switch back to TRAP_PID. */
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switch back to TRAP_PID. */
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inferior_ptid = trap_ptid;
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inferior_ptid = trap_ptid;
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|
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/* FIXME: Is this stuff really necessary? */
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/* FIXME: Is this stuff really necessary? */
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flush_cached_frames ();
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flush_cached_frames ();
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registers_changed ();
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registers_changed ();
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return 1;
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return 1;
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}
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}
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}
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}
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|
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return 0;
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return 0;
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}
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}
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#if 0
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#if 0
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static void
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static void
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lin_lwp_open (char *args, int from_tty)
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lin_lwp_open (char *args, int from_tty)
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{
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{
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push_target (&lin_lwp_ops);
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push_target (&lin_lwp_ops);
|
}
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}
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#endif
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#endif
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|
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/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
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/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
|
a message telling the user that a new LWP has been added to the
|
a message telling the user that a new LWP has been added to the
|
process. */
|
process. */
|
|
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void
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void
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lin_lwp_attach_lwp (ptid_t ptid, int verbose)
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lin_lwp_attach_lwp (ptid_t ptid, int verbose)
|
{
|
{
|
struct lwp_info *lp;
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struct lwp_info *lp;
|
|
|
gdb_assert (is_lwp (ptid));
|
gdb_assert (is_lwp (ptid));
|
|
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if (verbose)
|
if (verbose)
|
printf_filtered ("[New %s]\n", target_pid_to_str (ptid));
|
printf_filtered ("[New %s]\n", target_pid_to_str (ptid));
|
|
|
/* We assume that we're already tracing the initial process. */
|
/* We assume that we're already tracing the initial process. */
|
if (is_cloned (ptid) && ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
|
if (is_cloned (ptid) && ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
|
error ("Can't attach %s: %s", target_pid_to_str (ptid), strerror (errno));
|
error ("Can't attach %s: %s", target_pid_to_str (ptid), strerror (errno));
|
|
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
if (lp == NULL)
|
if (lp == NULL)
|
lp = add_lwp (ptid);
|
lp = add_lwp (ptid);
|
|
|
if (is_cloned (ptid))
|
if (is_cloned (ptid))
|
{
|
{
|
lp->signalled = 1;
|
lp->signalled = 1;
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
}
|
}
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_attach (char *args, int from_tty)
|
lin_lwp_attach (char *args, int from_tty)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
|
|
/* FIXME: We should probably accept a list of process id's, and
|
/* FIXME: We should probably accept a list of process id's, and
|
attach all of them. */
|
attach all of them. */
|
child_ops.to_attach (args, from_tty);
|
child_ops.to_attach (args, from_tty);
|
|
|
/* Add the initial process as the first LWP to the list. */
|
/* Add the initial process as the first LWP to the list. */
|
lp = add_lwp (BUILD_LWP (PIDGET (inferior_ptid), PIDGET (inferior_ptid)));
|
lp = add_lwp (BUILD_LWP (PIDGET (inferior_ptid), PIDGET (inferior_ptid)));
|
|
|
/* Make sure the initial process is stopped. The user-level threads
|
/* Make sure the initial process is stopped. The user-level threads
|
layer might want to poke around in the inferior, and that won't
|
layer might want to poke around in the inferior, and that won't
|
work if things haven't stabilized yet. */
|
work if things haven't stabilized yet. */
|
lp->signalled = 1;
|
lp->signalled = 1;
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
gdb_assert (lp->status == 0);
|
gdb_assert (lp->status == 0);
|
|
|
/* Fake the SIGSTOP that core GDB expects. */
|
/* Fake the SIGSTOP that core GDB expects. */
|
lp->status = W_STOPCODE (SIGSTOP);
|
lp->status = W_STOPCODE (SIGSTOP);
|
lp->resumed = 1;
|
lp->resumed = 1;
|
}
|
}
|
|
|
static int
|
static int
|
detach_callback (struct lwp_info *lp, void *data)
|
detach_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
|
|
if (debug_lin_lwp && lp->status)
|
if (debug_lin_lwp && lp->status)
|
fprintf_unfiltered (gdb_stdlog, "Pending %s for LWP %ld on detach.\n",
|
fprintf_unfiltered (gdb_stdlog, "Pending %s for LWP %ld on detach.\n",
|
strsignal (WSTOPSIG (lp->status)), GET_LWP (lp->ptid));
|
strsignal (WSTOPSIG (lp->status)), GET_LWP (lp->ptid));
|
|
|
while (lp->signalled && lp->stopped)
|
while (lp->signalled && lp->stopped)
|
{
|
{
|
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
|
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
|
WSTOPSIG (lp->status)) < 0)
|
WSTOPSIG (lp->status)) < 0)
|
error ("Can't continue %s: %s", target_pid_to_str (lp->ptid),
|
error ("Can't continue %s: %s", target_pid_to_str (lp->ptid),
|
strerror (errno));
|
strerror (errno));
|
|
|
lp->stopped = 0;
|
lp->stopped = 0;
|
lp->signalled = 0;
|
lp->signalled = 0;
|
lp->status = 0;
|
lp->status = 0;
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
|
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
}
|
}
|
|
|
if (is_cloned (lp->ptid))
|
if (is_cloned (lp->ptid))
|
{
|
{
|
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
|
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
|
WSTOPSIG (lp->status)) < 0)
|
WSTOPSIG (lp->status)) < 0)
|
error ("Can't detach %s: %s", target_pid_to_str (lp->ptid),
|
error ("Can't detach %s: %s", target_pid_to_str (lp->ptid),
|
strerror (errno));
|
strerror (errno));
|
|
|
delete_lwp (lp->ptid);
|
delete_lwp (lp->ptid);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_detach (char *args, int from_tty)
|
lin_lwp_detach (char *args, int from_tty)
|
{
|
{
|
iterate_over_lwps (detach_callback, NULL);
|
iterate_over_lwps (detach_callback, NULL);
|
|
|
/* Only the initial (uncloned) process should be left right now. */
|
/* Only the initial (uncloned) process should be left right now. */
|
gdb_assert (num_lwps == 1);
|
gdb_assert (num_lwps == 1);
|
|
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
/* Destroy LWP info; it's no longer valid. */
|
init_lwp_list ();
|
init_lwp_list ();
|
|
|
/* Restore the original signal mask. */
|
/* Restore the original signal mask. */
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
child_ops.to_detach (args, from_tty);
|
child_ops.to_detach (args, from_tty);
|
}
|
}
|
|
|
|
|
struct private_thread_info
|
struct private_thread_info
|
{
|
{
|
int lwpid;
|
int lwpid;
|
};
|
};
|
|
|
/* Return non-zero if TP corresponds to the LWP specified by DATA
|
/* Return non-zero if TP corresponds to the LWP specified by DATA
|
(which is assumed to be a pointer to a `struct lwp_info'. */
|
(which is assumed to be a pointer to a `struct lwp_info'. */
|
|
|
static int
|
static int
|
find_lwp_callback (struct thread_info *tp, void *data)
|
find_lwp_callback (struct thread_info *tp, void *data)
|
{
|
{
|
struct lwp_info *lp = data;
|
struct lwp_info *lp = data;
|
|
|
if (tp->private->lwpid == GET_LWP (lp->ptid))
|
if (tp->private->lwpid == GET_LWP (lp->ptid))
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Resume LP. */
|
/* Resume LP. */
|
|
|
static int
|
static int
|
resume_callback (struct lwp_info *lp, void *data)
|
resume_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (lp->stopped && lp->status == 0)
|
if (lp->stopped && lp->status == 0)
|
{
|
{
|
struct thread_info *tp;
|
struct thread_info *tp;
|
|
|
#if 0
|
#if 0
|
/* FIXME: kettenis/2000-08-26: This should really be handled
|
/* FIXME: kettenis/2000-08-26: This should really be handled
|
properly by core GDB. */
|
properly by core GDB. */
|
|
|
tp = find_thread_pid (lp->ptid);
|
tp = find_thread_pid (lp->ptid);
|
if (tp == NULL)
|
if (tp == NULL)
|
tp = iterate_over_threads (find_lwp_callback, lp);
|
tp = iterate_over_threads (find_lwp_callback, lp);
|
gdb_assert (tp);
|
gdb_assert (tp);
|
|
|
/* If we were previously stepping the thread, and now continue
|
/* If we were previously stepping the thread, and now continue
|
the thread we must invalidate the stepping range. However,
|
the thread we must invalidate the stepping range. However,
|
if there is a step_resume breakpoint for this thread, we must
|
if there is a step_resume breakpoint for this thread, we must
|
preserve the stepping range to make it possible to continue
|
preserve the stepping range to make it possible to continue
|
stepping once we hit it. */
|
stepping once we hit it. */
|
if (tp->step_range_end && tp->step_resume_breakpoint == NULL)
|
if (tp->step_range_end && tp->step_resume_breakpoint == NULL)
|
{
|
{
|
gdb_assert (lp->step);
|
gdb_assert (lp->step);
|
tp->step_range_start = tp->step_range_end = 0;
|
tp->step_range_start = tp->step_range_end = 0;
|
}
|
}
|
#endif
|
#endif
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0);
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0);
|
lp->stopped = 0;
|
lp->stopped = 0;
|
lp->step = 0;
|
lp->step = 0;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
resume_clear_callback (struct lwp_info *lp, void *data)
|
resume_clear_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
lp->resumed = 0;
|
lp->resumed = 0;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
resume_set_callback (struct lwp_info *lp, void *data)
|
resume_set_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
lp->resumed = 1;
|
lp->resumed = 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_resume (ptid_t ptid, int step, enum target_signal signo)
|
lin_lwp_resume (ptid_t ptid, int step, enum target_signal signo)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
int resume_all;
|
int resume_all;
|
|
|
/* Apparently the interpretation of PID is dependent on STEP: If
|
/* Apparently the interpretation of PID is dependent on STEP: If
|
STEP is non-zero, a specific PID means `step only this process
|
STEP is non-zero, a specific PID means `step only this process
|
id'. But if STEP is zero, then PID means `continue *all*
|
id'. But if STEP is zero, then PID means `continue *all*
|
processes, but give the signal only to this one'. */
|
processes, but give the signal only to this one'. */
|
resume_all = (PIDGET (ptid) == -1) || !step;
|
resume_all = (PIDGET (ptid) == -1) || !step;
|
|
|
if (resume_all)
|
if (resume_all)
|
iterate_over_lwps (resume_set_callback, NULL);
|
iterate_over_lwps (resume_set_callback, NULL);
|
else
|
else
|
iterate_over_lwps (resume_clear_callback, NULL);
|
iterate_over_lwps (resume_clear_callback, NULL);
|
|
|
/* If PID is -1, it's the current inferior that should be
|
/* If PID is -1, it's the current inferior that should be
|
handled specially. */
|
handled specially. */
|
if (PIDGET (ptid) == -1)
|
if (PIDGET (ptid) == -1)
|
ptid = inferior_ptid;
|
ptid = inferior_ptid;
|
|
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
if (lp)
|
if (lp)
|
{
|
{
|
ptid = pid_to_ptid (GET_LWP (lp->ptid));
|
ptid = pid_to_ptid (GET_LWP (lp->ptid));
|
|
|
/* Remember if we're stepping. */
|
/* Remember if we're stepping. */
|
lp->step = step;
|
lp->step = step;
|
|
|
/* Mark this LWP as resumed. */
|
/* Mark this LWP as resumed. */
|
lp->resumed = 1;
|
lp->resumed = 1;
|
|
|
/* If we have a pending wait status for this thread, there is no
|
/* If we have a pending wait status for this thread, there is no
|
point in resuming the process. */
|
point in resuming the process. */
|
if (lp->status)
|
if (lp->status)
|
{
|
{
|
/* FIXME: What should we do if we are supposed to continue
|
/* FIXME: What should we do if we are supposed to continue
|
this thread with a signal? */
|
this thread with a signal? */
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
return;
|
return;
|
}
|
}
|
|
|
/* Mark LWP as not stopped to prevent it from being continued by
|
/* Mark LWP as not stopped to prevent it from being continued by
|
resume_callback. */
|
resume_callback. */
|
lp->stopped = 0;
|
lp->stopped = 0;
|
}
|
}
|
|
|
if (resume_all)
|
if (resume_all)
|
iterate_over_lwps (resume_callback, NULL);
|
iterate_over_lwps (resume_callback, NULL);
|
|
|
child_resume (ptid, step, signo);
|
child_resume (ptid, step, signo);
|
}
|
}
|
|
|
|
|
/* Send a SIGSTOP to LP. */
|
/* Send a SIGSTOP to LP. */
|
|
|
static int
|
static int
|
stop_callback (struct lwp_info *lp, void *data)
|
stop_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (! lp->stopped && ! lp->signalled)
|
if (! lp->stopped && ! lp->signalled)
|
{
|
{
|
int ret;
|
int ret;
|
|
|
ret = kill (GET_LWP (lp->ptid), SIGSTOP);
|
ret = kill (GET_LWP (lp->ptid), SIGSTOP);
|
gdb_assert (ret == 0);
|
gdb_assert (ret == 0);
|
|
|
lp->signalled = 1;
|
lp->signalled = 1;
|
gdb_assert (lp->status == 0);
|
gdb_assert (lp->status == 0);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Wait until LP is stopped. */
|
/* Wait until LP is stopped. */
|
|
|
static int
|
static int
|
stop_wait_callback (struct lwp_info *lp, void *data)
|
stop_wait_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (! lp->stopped && lp->signalled)
|
if (! lp->stopped && lp->signalled)
|
{
|
{
|
pid_t pid;
|
pid_t pid;
|
int status;
|
int status;
|
|
|
gdb_assert (lp->status == 0);
|
gdb_assert (lp->status == 0);
|
|
|
pid = waitpid (GET_LWP (lp->ptid), &status,
|
pid = waitpid (GET_LWP (lp->ptid), &status,
|
is_cloned (lp->ptid) ? __WCLONE : 0);
|
is_cloned (lp->ptid) ? __WCLONE : 0);
|
if (pid == -1 && errno == ECHILD)
|
if (pid == -1 && errno == ECHILD)
|
/* OK, the proccess has disappeared. We'll catch the actual
|
/* OK, the proccess has disappeared. We'll catch the actual
|
exit event in lin_lwp_wait. */
|
exit event in lin_lwp_wait. */
|
return 0;
|
return 0;
|
|
|
gdb_assert (pid == GET_LWP (lp->ptid));
|
gdb_assert (pid == GET_LWP (lp->ptid));
|
|
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
{
|
{
|
gdb_assert (num_lwps > 1);
|
gdb_assert (num_lwps > 1);
|
|
|
if (in_thread_list (lp->ptid))
|
if (in_thread_list (lp->ptid))
|
{
|
{
|
/* Core GDB cannot deal with us deleting the current
|
/* Core GDB cannot deal with us deleting the current
|
thread. */
|
thread. */
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
delete_thread (lp->ptid);
|
delete_thread (lp->ptid);
|
printf_unfiltered ("[%s exited]\n",
|
printf_unfiltered ("[%s exited]\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"%s exited.\n", target_pid_to_str (lp->ptid));
|
"%s exited.\n", target_pid_to_str (lp->ptid));
|
|
|
delete_lwp (lp->ptid);
|
delete_lwp (lp->ptid);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
gdb_assert (WIFSTOPPED (status));
|
gdb_assert (WIFSTOPPED (status));
|
|
|
if (WSTOPSIG (status) != SIGSTOP)
|
if (WSTOPSIG (status) != SIGSTOP)
|
{
|
{
|
if (WSTOPSIG (status) == SIGTRAP)
|
if (WSTOPSIG (status) == SIGTRAP)
|
{
|
{
|
/* If a LWP other than the LWP that we're reporting an
|
/* If a LWP other than the LWP that we're reporting an
|
event for has hit a GDB breakpoint (as opposed to
|
event for has hit a GDB breakpoint (as opposed to
|
some random trap signal), then just arrange for it to
|
some random trap signal), then just arrange for it to
|
hit it again later. We don't keep the SIGTRAP status
|
hit it again later. We don't keep the SIGTRAP status
|
and don't forward the SIGTRAP signal to the LWP. We
|
and don't forward the SIGTRAP signal to the LWP. We
|
will handle the current event, eventually we will
|
will handle the current event, eventually we will
|
resume all LWPs, and this one will get its breakpoint
|
resume all LWPs, and this one will get its breakpoint
|
trap again.
|
trap again.
|
|
|
If we do not do this, then we run the risk that the
|
If we do not do this, then we run the risk that the
|
user will delete or disable the breakpoint, but the
|
user will delete or disable the breakpoint, but the
|
thread will have already tripped on it. */
|
thread will have already tripped on it. */
|
|
|
/* Now resume this LWP and get the SIGSTOP event. */
|
/* Now resume this LWP and get the SIGSTOP event. */
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
{
|
{
|
fprintf_unfiltered (gdb_stderr,
|
fprintf_unfiltered (gdb_stderr,
|
"SWC: Candidate SIGTRAP event in %ld\n",
|
"SWC: Candidate SIGTRAP event in %ld\n",
|
GET_LWP (lp->ptid));
|
GET_LWP (lp->ptid));
|
}
|
}
|
/* Hold the SIGTRAP for handling by lin_lwp_wait. */
|
/* Hold the SIGTRAP for handling by lin_lwp_wait. */
|
stop_wait_callback (lp, data);
|
stop_wait_callback (lp, data);
|
/* If there's another event, throw it back into the queue. */
|
/* If there's another event, throw it back into the queue. */
|
if (lp->status)
|
if (lp->status)
|
kill (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
|
kill (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
|
/* Save the sigtrap event. */
|
/* Save the sigtrap event. */
|
lp->status = status;
|
lp->status = status;
|
return 0;
|
return 0;
|
}
|
}
|
else if (WSTOPSIG (status) == SIGINT &&
|
else if (WSTOPSIG (status) == SIGINT &&
|
signal_pass_state (SIGINT) == 0)
|
signal_pass_state (SIGINT) == 0)
|
{
|
{
|
/* Since SIGINT gets forwarded to the entire process group
|
/* Since SIGINT gets forwarded to the entire process group
|
(in the case where ^C/BREAK is typed at the tty/console),
|
(in the case where ^C/BREAK is typed at the tty/console),
|
just ignore all SIGINT events from all lwp's except for
|
just ignore all SIGINT events from all lwp's except for
|
the one that was caught by lin_lwp_wait. */
|
the one that was caught by lin_lwp_wait. */
|
|
|
/* Now resume this LWP and get the SIGSTOP event. */
|
/* Now resume this LWP and get the SIGSTOP event. */
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
return stop_wait_callback (lp, data);
|
return stop_wait_callback (lp, data);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* The thread was stopped with a signal other than
|
/* The thread was stopped with a signal other than
|
SIGSTOP, and didn't accidentally trip a breakpoint. */
|
SIGSTOP, and didn't accidentally trip a breakpoint. */
|
|
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
{
|
{
|
fprintf_unfiltered (gdb_stderr,
|
fprintf_unfiltered (gdb_stderr,
|
"SWC: Pending event %d in %ld\n",
|
"SWC: Pending event %d in %ld\n",
|
WSTOPSIG (status), GET_LWP (lp->ptid));
|
WSTOPSIG (status), GET_LWP (lp->ptid));
|
}
|
}
|
/* Now resume this LWP and get the SIGSTOP event. */
|
/* Now resume this LWP and get the SIGSTOP event. */
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
/* Hold this event/waitstatus while we check to see if
|
/* Hold this event/waitstatus while we check to see if
|
there are any more (we still want to get that SIGSTOP). */
|
there are any more (we still want to get that SIGSTOP). */
|
stop_wait_callback (lp, data);
|
stop_wait_callback (lp, data);
|
/* If the lp->status field is still empty, use it to hold
|
/* If the lp->status field is still empty, use it to hold
|
this event. If not, then this event must be returned
|
this event. If not, then this event must be returned
|
to the event queue of the LWP. */
|
to the event queue of the LWP. */
|
if (lp->status == 0)
|
if (lp->status == 0)
|
lp->status = status;
|
lp->status = status;
|
else
|
else
|
kill (GET_LWP (lp->ptid), WSTOPSIG (status));
|
kill (GET_LWP (lp->ptid), WSTOPSIG (status));
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/* We caught the SIGSTOP that we intended to catch, so
|
/* We caught the SIGSTOP that we intended to catch, so
|
there's no SIGSTOP pending. */
|
there's no SIGSTOP pending. */
|
lp->stopped = 1;
|
lp->stopped = 1;
|
lp->signalled = 0;
|
lp->signalled = 0;
|
}
|
}
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Return non-zero if LP has a wait status pending. */
|
/* Return non-zero if LP has a wait status pending. */
|
|
|
static int
|
static int
|
status_callback (struct lwp_info *lp, void *data)
|
status_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
/* Only report a pending wait status if we pretend that this has
|
/* Only report a pending wait status if we pretend that this has
|
indeed been resumed. */
|
indeed been resumed. */
|
return (lp->status != 0 && lp->resumed);
|
return (lp->status != 0 && lp->resumed);
|
}
|
}
|
|
|
/* Return non-zero if LP isn't stopped. */
|
/* Return non-zero if LP isn't stopped. */
|
|
|
static int
|
static int
|
running_callback (struct lwp_info *lp, void *data)
|
running_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
return (lp->stopped == 0);
|
return (lp->stopped == 0);
|
}
|
}
|
|
|
/* Count the LWP's that have had events. */
|
/* Count the LWP's that have had events. */
|
|
|
static int
|
static int
|
count_events_callback (struct lwp_info *lp, void *data)
|
count_events_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
int *count = data;
|
int *count = data;
|
|
|
gdb_assert (count != NULL);
|
gdb_assert (count != NULL);
|
|
|
/* Count only LWPs that have a SIGTRAP event pending. */
|
/* Count only LWPs that have a SIGTRAP event pending. */
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
(*count)++;
|
(*count)++;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select the LWP (if any) that is currently being single-stepped. */
|
/* Select the LWP (if any) that is currently being single-stepped. */
|
|
|
static int
|
static int
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (lp->step && lp->status != 0)
|
if (lp->step && lp->status != 0)
|
return 1;
|
return 1;
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select the Nth LWP that has had a SIGTRAP event. */
|
/* Select the Nth LWP that has had a SIGTRAP event. */
|
|
|
static int
|
static int
|
select_event_lwp_callback (struct lwp_info *lp, void *data)
|
select_event_lwp_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
int *selector = data;
|
int *selector = data;
|
|
|
gdb_assert (selector != NULL);
|
gdb_assert (selector != NULL);
|
|
|
/* Select only LWPs that have a SIGTRAP event pending. */
|
/* Select only LWPs that have a SIGTRAP event pending. */
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
if ((*selector)-- == 0)
|
if ((*selector)-- == 0)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
|
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
struct lwp_info *event_lp = data;
|
struct lwp_info *event_lp = data;
|
|
|
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
|
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
|
if (lp == event_lp)
|
if (lp == event_lp)
|
return 0;
|
return 0;
|
|
|
/* If a LWP other than the LWP that we're reporting an event for has
|
/* 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),
|
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
|
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
|
the SIGTRAP status and don't forward the SIGTRAP signal to the
|
LWP. We will handle the current event, eventually we will resume
|
LWP. We will handle the current event, eventually we will resume
|
all LWPs, and this one will get its breakpoint trap again.
|
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
|
If we do not do this, then we run the risk that the user will
|
delete or disable the breakpoint, but the LWP will have already
|
delete or disable the breakpoint, but the LWP will have already
|
tripped on it. */
|
tripped on it. */
|
|
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
|
&& breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
|
&& breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
|
DECR_PC_AFTER_BREAK))
|
DECR_PC_AFTER_BREAK))
|
{
|
{
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Push back breakpoint for LWP %ld\n",
|
"Push back breakpoint for LWP %ld\n",
|
GET_LWP (lp->ptid));
|
GET_LWP (lp->ptid));
|
|
|
/* Back up the PC if necessary. */
|
/* Back up the PC if necessary. */
|
if (DECR_PC_AFTER_BREAK)
|
if (DECR_PC_AFTER_BREAK)
|
write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid);
|
write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid);
|
|
|
/* Throw away the SIGTRAP. */
|
/* Throw away the SIGTRAP. */
|
lp->status = 0;
|
lp->status = 0;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select one LWP out of those that have events pending. */
|
/* Select one LWP out of those that have events pending. */
|
|
|
static void
|
static void
|
select_event_lwp (struct lwp_info **orig_lp, int *status)
|
select_event_lwp (struct lwp_info **orig_lp, int *status)
|
{
|
{
|
int num_events = 0;
|
int num_events = 0;
|
int random_selector;
|
int random_selector;
|
struct lwp_info *event_lp;
|
struct lwp_info *event_lp;
|
|
|
/* Record the wait status for the origional LWP. */
|
/* Record the wait status for the origional LWP. */
|
(*orig_lp)->status = *status;
|
(*orig_lp)->status = *status;
|
|
|
/* Give preference to any LWP that is being single-stepped. */
|
/* 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 (select_singlestep_lwp_callback, NULL);
|
if (event_lp != NULL)
|
if (event_lp != NULL)
|
{
|
{
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Select single-step LWP %ld\n",
|
"Select single-step LWP %ld\n",
|
GET_LWP (event_lp->ptid));
|
GET_LWP (event_lp->ptid));
|
}
|
}
|
else
|
else
|
{
|
{
|
/* No single-stepping LWP. Select one at random, out of those
|
/* No single-stepping LWP. Select one at random, out of those
|
which have had SIGTRAP events. */
|
which have had SIGTRAP events. */
|
|
|
/* First see how many SIGTRAP events we have. */
|
/* First see how many SIGTRAP events we have. */
|
iterate_over_lwps (count_events_callback, &num_events);
|
iterate_over_lwps (count_events_callback, &num_events);
|
|
|
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
|
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
|
random_selector = (int)
|
random_selector = (int)
|
((num_events * (double) rand ()) / (RAND_MAX + 1.0));
|
((num_events * (double) rand ()) / (RAND_MAX + 1.0));
|
|
|
if (debug_lin_lwp && num_events > 1)
|
if (debug_lin_lwp && num_events > 1)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Found %d SIGTRAP events, selecting #%d\n",
|
"Found %d SIGTRAP events, selecting #%d\n",
|
num_events, random_selector);
|
num_events, random_selector);
|
|
|
event_lp = iterate_over_lwps (select_event_lwp_callback,
|
event_lp = iterate_over_lwps (select_event_lwp_callback,
|
&random_selector);
|
&random_selector);
|
}
|
}
|
|
|
if (event_lp != NULL)
|
if (event_lp != NULL)
|
{
|
{
|
/* Switch the event LWP. */
|
/* Switch the event LWP. */
|
*orig_lp = event_lp;
|
*orig_lp = event_lp;
|
*status = event_lp->status;
|
*status = event_lp->status;
|
}
|
}
|
|
|
/* Flush the wait status for the event LWP. */
|
/* Flush the wait status for the event LWP. */
|
(*orig_lp)->status = 0;
|
(*orig_lp)->status = 0;
|
}
|
}
|
|
|
/* Return non-zero if LP has been resumed. */
|
/* Return non-zero if LP has been resumed. */
|
|
|
static int
|
static int
|
resumed_callback (struct lwp_info *lp, void *data)
|
resumed_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
return lp->resumed;
|
return lp->resumed;
|
}
|
}
|
|
|
static ptid_t
|
static ptid_t
|
lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
lin_lwp_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
{
|
{
|
struct lwp_info *lp = NULL;
|
struct lwp_info *lp = NULL;
|
int options = 0;
|
int options = 0;
|
int status = 0;
|
int status = 0;
|
pid_t pid = PIDGET (ptid);
|
pid_t pid = PIDGET (ptid);
|
|
|
/* Make sure SIGCHLD is blocked. */
|
/* Make sure SIGCHLD is blocked. */
|
if (! sigismember (&blocked_mask, SIGCHLD))
|
if (! sigismember (&blocked_mask, SIGCHLD))
|
{
|
{
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
}
|
}
|
|
|
retry:
|
retry:
|
|
|
/* Make sure there is at least one thread that has been resumed. */
|
/* Make sure there is at least one thread that has been resumed. */
|
gdb_assert (iterate_over_lwps (resumed_callback, NULL));
|
gdb_assert (iterate_over_lwps (resumed_callback, NULL));
|
|
|
/* First check if there is a LWP with a wait status pending. */
|
/* First check if there is a LWP with a wait status pending. */
|
if (pid == -1)
|
if (pid == -1)
|
{
|
{
|
/* Any LWP that's been resumed will do. */
|
/* Any LWP that's been resumed will do. */
|
lp = iterate_over_lwps (status_callback, NULL);
|
lp = iterate_over_lwps (status_callback, NULL);
|
if (lp)
|
if (lp)
|
{
|
{
|
status = lp->status;
|
status = lp->status;
|
lp->status = 0;
|
lp->status = 0;
|
|
|
if (debug_lin_lwp && status)
|
if (debug_lin_lwp && status)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Using pending wait status %d for LWP %ld.\n",
|
"Using pending wait status %d for LWP %ld.\n",
|
WIFSTOPPED (status) ? WSTOPSIG (status) :
|
WIFSTOPPED (status) ? WSTOPSIG (status) :
|
WIFSIGNALED (status) ? WTERMSIG (status) :
|
WIFSIGNALED (status) ? WTERMSIG (status) :
|
WEXITSTATUS (status), GET_LWP (lp->ptid));
|
WEXITSTATUS (status), GET_LWP (lp->ptid));
|
}
|
}
|
|
|
/* But if we don't fine one, we'll have to wait, and check both
|
/* But if we don't fine one, we'll have to wait, and check both
|
cloned and uncloned processes. We start with the cloned
|
cloned and uncloned processes. We start with the cloned
|
processes. */
|
processes. */
|
options = __WCLONE | WNOHANG;
|
options = __WCLONE | WNOHANG;
|
}
|
}
|
else if (is_lwp (ptid))
|
else if (is_lwp (ptid))
|
{
|
{
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Waiting for specific LWP %ld.\n",
|
"Waiting for specific LWP %ld.\n",
|
GET_LWP (ptid));
|
GET_LWP (ptid));
|
|
|
/* We have a specific LWP to check. */
|
/* We have a specific LWP to check. */
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
gdb_assert (lp);
|
gdb_assert (lp);
|
status = lp->status;
|
status = lp->status;
|
lp->status = 0;
|
lp->status = 0;
|
|
|
if (debug_lin_lwp && status)
|
if (debug_lin_lwp && status)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Using pending wait status %d for LWP %ld.\n",
|
"Using pending wait status %d for LWP %ld.\n",
|
WIFSTOPPED (status) ? WSTOPSIG (status) :
|
WIFSTOPPED (status) ? WSTOPSIG (status) :
|
WIFSIGNALED (status) ? WTERMSIG (status) :
|
WIFSIGNALED (status) ? WTERMSIG (status) :
|
WEXITSTATUS (status), GET_LWP (lp->ptid));
|
WEXITSTATUS (status), GET_LWP (lp->ptid));
|
|
|
/* If we have to wait, take into account whether PID is a cloned
|
/* 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
|
process or not. And we have to convert it to something that
|
the layer beneath us can understand. */
|
the layer beneath us can understand. */
|
options = is_cloned (lp->ptid) ? __WCLONE : 0;
|
options = is_cloned (lp->ptid) ? __WCLONE : 0;
|
pid = GET_LWP (ptid);
|
pid = GET_LWP (ptid);
|
}
|
}
|
|
|
if (status && lp->signalled)
|
if (status && lp->signalled)
|
{
|
{
|
/* A pending SIGSTOP may interfere with the normal stream of
|
/* A pending SIGSTOP may interfere with the normal stream of
|
events. In a typical case where interference is a problem,
|
events. In a typical case where interference is a problem,
|
we have a SIGSTOP signal pending for LWP A while
|
we have a SIGSTOP signal pending for LWP A while
|
single-stepping it, encounter an event in LWP B, and take the
|
single-stepping it, encounter an event in LWP B, and take the
|
pending SIGSTOP while trying to stop LWP A. After processing
|
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 event in LWP B, LWP A is continued, and we'll never see
|
the SIGTRAP associated with the last time we were
|
the SIGTRAP associated with the last time we were
|
single-stepping LWP A. */
|
single-stepping LWP A. */
|
|
|
/* Resume the thread. It should halt immediately returning the
|
/* Resume the thread. It should halt immediately returning the
|
pending SIGSTOP. */
|
pending SIGSTOP. */
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
TARGET_SIGNAL_0);
|
TARGET_SIGNAL_0);
|
lp->stopped = 0;
|
lp->stopped = 0;
|
gdb_assert (lp->resumed);
|
gdb_assert (lp->resumed);
|
|
|
/* This should catch the pending SIGSTOP. */
|
/* This should catch the pending SIGSTOP. */
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
}
|
}
|
|
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
attached process. */
|
attached process. */
|
set_sigio_trap ();
|
set_sigio_trap ();
|
|
|
while (status == 0)
|
while (status == 0)
|
{
|
{
|
pid_t lwpid;
|
pid_t lwpid;
|
|
|
lwpid = waitpid (pid, &status, options);
|
lwpid = waitpid (pid, &status, options);
|
if (lwpid > 0)
|
if (lwpid > 0)
|
{
|
{
|
gdb_assert (pid == -1 || lwpid == pid);
|
gdb_assert (pid == -1 || lwpid == pid);
|
|
|
lp = find_lwp_pid (pid_to_ptid (lwpid));
|
lp = find_lwp_pid (pid_to_ptid (lwpid));
|
if (! lp)
|
if (! lp)
|
{
|
{
|
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
|
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
|
if (threaded)
|
if (threaded)
|
{
|
{
|
gdb_assert (WIFSTOPPED (status)
|
gdb_assert (WIFSTOPPED (status)
|
&& WSTOPSIG (status) == SIGSTOP);
|
&& WSTOPSIG (status) == SIGSTOP);
|
lp->signalled = 1;
|
lp->signalled = 1;
|
|
|
if (! in_thread_list (inferior_ptid))
|
if (! in_thread_list (inferior_ptid))
|
{
|
{
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
GET_PID (inferior_ptid));
|
GET_PID (inferior_ptid));
|
add_thread (inferior_ptid);
|
add_thread (inferior_ptid);
|
}
|
}
|
|
|
add_thread (lp->ptid);
|
add_thread (lp->ptid);
|
printf_unfiltered ("[New %s]\n",
|
printf_unfiltered ("[New %s]\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
}
|
}
|
|
|
/* Make sure we don't report a TARGET_WAITKIND_EXITED or
|
/* Make sure we don't report a TARGET_WAITKIND_EXITED or
|
TARGET_WAITKIND_SIGNALLED event if there are still LWP's
|
TARGET_WAITKIND_SIGNALLED event if there are still LWP's
|
left in the process. */
|
left in the process. */
|
if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
|
if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
|
{
|
{
|
if (in_thread_list (lp->ptid))
|
if (in_thread_list (lp->ptid))
|
{
|
{
|
/* Core GDB cannot deal with us deleting the current
|
/* Core GDB cannot deal with us deleting the current
|
thread. */
|
thread. */
|
if (! ptid_equal (lp->ptid, inferior_ptid))
|
if (! ptid_equal (lp->ptid, inferior_ptid))
|
delete_thread (lp->ptid);
|
delete_thread (lp->ptid);
|
printf_unfiltered ("[%s exited]\n",
|
printf_unfiltered ("[%s exited]\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"%s exited.\n",
|
"%s exited.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
delete_lwp (lp->ptid);
|
delete_lwp (lp->ptid);
|
|
|
/* Make sure there is at least one thread running. */
|
/* Make sure there is at least one thread running. */
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
|
|
/* Discard the event. */
|
/* Discard the event. */
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
/* Make sure we don't report a SIGSTOP that we sent
|
/* Make sure we don't report a SIGSTOP that we sent
|
ourselves in an attempt to stop an LWP. */
|
ourselves in an attempt to stop an LWP. */
|
if (lp->signalled && WIFSTOPPED (status)
|
if (lp->signalled && WIFSTOPPED (status)
|
&& WSTOPSIG (status) == SIGSTOP)
|
&& WSTOPSIG (status) == SIGSTOP)
|
{
|
{
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"Delayed SIGSTOP caught for %s.\n",
|
"Delayed SIGSTOP caught for %s.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
/* This is a delayed SIGSTOP. */
|
/* This is a delayed SIGSTOP. */
|
lp->signalled = 0;
|
lp->signalled = 0;
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
TARGET_SIGNAL_0);
|
TARGET_SIGNAL_0);
|
lp->stopped = 0;
|
lp->stopped = 0;
|
gdb_assert (lp->resumed);
|
gdb_assert (lp->resumed);
|
|
|
/* Discard the event. */
|
/* Discard the event. */
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
break;
|
break;
|
}
|
}
|
|
|
if (pid == -1)
|
if (pid == -1)
|
{
|
{
|
/* Alternate between checking cloned and uncloned processes. */
|
/* Alternate between checking cloned and uncloned processes. */
|
options ^= __WCLONE;
|
options ^= __WCLONE;
|
|
|
/* And suspend every time we have checked both. */
|
/* And suspend every time we have checked both. */
|
if (options & __WCLONE)
|
if (options & __WCLONE)
|
sigsuspend (&suspend_mask);
|
sigsuspend (&suspend_mask);
|
}
|
}
|
|
|
/* We shouldn't end up here unless we want to try again. */
|
/* We shouldn't end up here unless we want to try again. */
|
gdb_assert (status == 0);
|
gdb_assert (status == 0);
|
}
|
}
|
|
|
clear_sigio_trap ();
|
clear_sigio_trap ();
|
clear_sigint_trap ();
|
clear_sigint_trap ();
|
|
|
gdb_assert (lp);
|
gdb_assert (lp);
|
|
|
/* Don't report signals that GDB isn't interested in, such as
|
/* Don't report signals that GDB isn't interested in, such as
|
signals that are neither printed nor stopped upon. Stopping all
|
signals that are neither printed nor stopped upon. Stopping all
|
threads can be a bit time-consuming so if we want decent
|
threads can be a bit time-consuming so if we want decent
|
performance with heavily multi-threaded programs, especially when
|
performance with heavily multi-threaded programs, especially when
|
they're using a high frequency timer, we'd better avoid it if we
|
they're using a high frequency timer, we'd better avoid it if we
|
can. */
|
can. */
|
|
|
if (WIFSTOPPED (status))
|
if (WIFSTOPPED (status))
|
{
|
{
|
int signo = target_signal_from_host (WSTOPSIG (status));
|
int signo = target_signal_from_host (WSTOPSIG (status));
|
|
|
if (signal_stop_state (signo) == 0
|
if (signal_stop_state (signo) == 0
|
&& signal_print_state (signo) == 0
|
&& signal_print_state (signo) == 0
|
&& signal_pass_state (signo) == 1)
|
&& signal_pass_state (signo) == 1)
|
{
|
{
|
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
|
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
|
here? It is not clear we should. GDB may not expect
|
here? It is not clear we should. GDB may not expect
|
other threads to run. On the other hand, not resuming
|
other threads to run. On the other hand, not resuming
|
newly attached threads may cause an unwanted delay in
|
newly attached threads may cause an unwanted delay in
|
getting them running. */
|
getting them running. */
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo);
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo);
|
lp->stopped = 0;
|
lp->stopped = 0;
|
status = 0;
|
status = 0;
|
goto retry;
|
goto retry;
|
}
|
}
|
}
|
}
|
|
|
/* This LWP is stopped now. */
|
/* This LWP is stopped now. */
|
lp->stopped = 1;
|
lp->stopped = 1;
|
|
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Candidate event %d in %ld\n",
|
"LLW: Candidate event %d in %ld\n",
|
WSTOPSIG (status), GET_LWP (lp->ptid));
|
WSTOPSIG (status), GET_LWP (lp->ptid));
|
|
|
/* Now stop all other LWP's ... */
|
/* Now stop all other LWP's ... */
|
iterate_over_lwps (stop_callback, NULL);
|
iterate_over_lwps (stop_callback, NULL);
|
|
|
/* ... and wait until all of them have reported back that they're no
|
/* ... and wait until all of them have reported back that they're no
|
longer running. */
|
longer running. */
|
iterate_over_lwps (stop_wait_callback, NULL);
|
iterate_over_lwps (stop_wait_callback, NULL);
|
|
|
/* If we're not waiting for a specific LWP, choose an event LWP from
|
/* 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
|
among those that have had events. Giving equal priority to all
|
LWPs that have had events helps prevent starvation. */
|
LWPs that have had events helps prevent starvation. */
|
if (pid == -1)
|
if (pid == -1)
|
select_event_lwp (&lp, &status);
|
select_event_lwp (&lp, &status);
|
|
|
/* Now that we've selected our final event LWP, cancel any
|
/* Now that we've selected our final event LWP, cancel any
|
breakpoints in other LWPs that have hit a GDB breakpoint. See
|
breakpoints in other LWPs that have hit a GDB breakpoint. See
|
the comment in cancel_breakpoints_callback to find out why. */
|
the comment in cancel_breakpoints_callback to find out why. */
|
iterate_over_lwps (cancel_breakpoints_callback, lp);
|
iterate_over_lwps (cancel_breakpoints_callback, lp);
|
|
|
/* If we're not running in "threaded" mode, we'll report the bare
|
/* If we're not running in "threaded" mode, we'll report the bare
|
process id. */
|
process id. */
|
|
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
{
|
{
|
trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
if (debug_lin_lwp)
|
if (debug_lin_lwp)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: trap_ptid is %ld\n",
|
"LLW: trap_ptid is %ld\n",
|
GET_LWP (trap_ptid));
|
GET_LWP (trap_ptid));
|
}
|
}
|
else
|
else
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
store_waitstatus (ourstatus, status);
|
store_waitstatus (ourstatus, status);
|
return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
}
|
}
|
|
|
static int
|
static int
|
kill_callback (struct lwp_info *lp, void *data)
|
kill_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
kill_wait_callback (struct lwp_info *lp, void *data)
|
kill_wait_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
pid_t pid;
|
pid_t pid;
|
|
|
/* We must make sure that there are no pending events (delayed
|
/* We must make sure that there are no pending events (delayed
|
SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
|
SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
|
program doesn't interfere with any following debugging session. */
|
program doesn't interfere with any following debugging session. */
|
|
|
/* For cloned processes we must check both with __WCLONE and
|
/* For cloned processes we must check both with __WCLONE and
|
without, since the exit status of a cloned process isn't reported
|
without, since the exit status of a cloned process isn't reported
|
with __WCLONE. */
|
with __WCLONE. */
|
if (is_cloned (lp->ptid))
|
if (is_cloned (lp->ptid))
|
{
|
{
|
do
|
do
|
{
|
{
|
pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
|
pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
|
}
|
}
|
while (pid == GET_LWP (lp->ptid));
|
while (pid == GET_LWP (lp->ptid));
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
gdb_assert (pid == -1 && errno == ECHILD);
|
}
|
}
|
|
|
do
|
do
|
{
|
{
|
pid = waitpid (GET_LWP (lp->ptid), NULL, 0);
|
pid = waitpid (GET_LWP (lp->ptid), NULL, 0);
|
}
|
}
|
while (pid == GET_LWP (lp->ptid));
|
while (pid == GET_LWP (lp->ptid));
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
gdb_assert (pid == -1 && errno == ECHILD);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_kill (void)
|
lin_lwp_kill (void)
|
{
|
{
|
/* Kill all LWP's ... */
|
/* Kill all LWP's ... */
|
iterate_over_lwps (kill_callback, NULL);
|
iterate_over_lwps (kill_callback, NULL);
|
|
|
/* ... and wait until we've flushed all events. */
|
/* ... and wait until we've flushed all events. */
|
iterate_over_lwps (kill_wait_callback, NULL);
|
iterate_over_lwps (kill_wait_callback, NULL);
|
|
|
target_mourn_inferior ();
|
target_mourn_inferior ();
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_create_inferior (char *exec_file, char *allargs, char **env)
|
lin_lwp_create_inferior (char *exec_file, char *allargs, char **env)
|
{
|
{
|
child_ops.to_create_inferior (exec_file, allargs, env);
|
child_ops.to_create_inferior (exec_file, allargs, env);
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_mourn_inferior (void)
|
lin_lwp_mourn_inferior (void)
|
{
|
{
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
/* Destroy LWP info; it's no longer valid. */
|
init_lwp_list ();
|
init_lwp_list ();
|
|
|
/* Restore the original signal mask. */
|
/* Restore the original signal mask. */
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
child_ops.to_mourn_inferior ();
|
child_ops.to_mourn_inferior ();
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_fetch_registers (int regno)
|
lin_lwp_fetch_registers (int regno)
|
{
|
{
|
struct cleanup *old_chain = save_inferior_ptid ();
|
struct cleanup *old_chain = save_inferior_ptid ();
|
|
|
if (is_lwp (inferior_ptid))
|
if (is_lwp (inferior_ptid))
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
|
|
fetch_inferior_registers (regno);
|
fetch_inferior_registers (regno);
|
|
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
}
|
}
|
|
|
static void
|
static void
|
lin_lwp_store_registers (int regno)
|
lin_lwp_store_registers (int regno)
|
{
|
{
|
struct cleanup *old_chain = save_inferior_ptid ();
|
struct cleanup *old_chain = save_inferior_ptid ();
|
|
|
if (is_lwp (inferior_ptid))
|
if (is_lwp (inferior_ptid))
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
|
|
store_inferior_registers (regno);
|
store_inferior_registers (regno);
|
|
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
}
|
}
|
|
|
static int
|
static int
|
lin_lwp_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
|
lin_lwp_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
|
struct mem_attrib *attrib,
|
struct mem_attrib *attrib,
|
struct target_ops *target)
|
struct target_ops *target)
|
{
|
{
|
struct cleanup *old_chain = save_inferior_ptid ();
|
struct cleanup *old_chain = save_inferior_ptid ();
|
int xfer;
|
int xfer;
|
|
|
if (is_lwp (inferior_ptid))
|
if (is_lwp (inferior_ptid))
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
|
|
xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target);
|
xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target);
|
|
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
return xfer;
|
return xfer;
|
}
|
}
|
|
|
static int
|
static int
|
lin_lwp_thread_alive (ptid_t ptid)
|
lin_lwp_thread_alive (ptid_t ptid)
|
{
|
{
|
gdb_assert (is_lwp (ptid));
|
gdb_assert (is_lwp (ptid));
|
|
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
|
ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
|
if (errno)
|
if (errno)
|
return 0;
|
return 0;
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static char *
|
static char *
|
lin_lwp_pid_to_str (ptid_t ptid)
|
lin_lwp_pid_to_str (ptid_t ptid)
|
{
|
{
|
static char buf[64];
|
static char buf[64];
|
|
|
if (is_lwp (ptid))
|
if (is_lwp (ptid))
|
{
|
{
|
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
|
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
|
return buf;
|
return buf;
|
}
|
}
|
|
|
return normal_pid_to_str (ptid);
|
return normal_pid_to_str (ptid);
|
}
|
}
|
|
|
static void
|
static void
|
init_lin_lwp_ops (void)
|
init_lin_lwp_ops (void)
|
{
|
{
|
#if 0
|
#if 0
|
lin_lwp_ops.to_open = lin_lwp_open;
|
lin_lwp_ops.to_open = lin_lwp_open;
|
#endif
|
#endif
|
lin_lwp_ops.to_shortname = "lwp-layer";
|
lin_lwp_ops.to_shortname = "lwp-layer";
|
lin_lwp_ops.to_longname = "lwp-layer";
|
lin_lwp_ops.to_longname = "lwp-layer";
|
lin_lwp_ops.to_doc = "Low level threads support (LWP layer)";
|
lin_lwp_ops.to_doc = "Low level threads support (LWP layer)";
|
lin_lwp_ops.to_attach = lin_lwp_attach;
|
lin_lwp_ops.to_attach = lin_lwp_attach;
|
lin_lwp_ops.to_detach = lin_lwp_detach;
|
lin_lwp_ops.to_detach = lin_lwp_detach;
|
lin_lwp_ops.to_resume = lin_lwp_resume;
|
lin_lwp_ops.to_resume = lin_lwp_resume;
|
lin_lwp_ops.to_wait = lin_lwp_wait;
|
lin_lwp_ops.to_wait = lin_lwp_wait;
|
lin_lwp_ops.to_fetch_registers = lin_lwp_fetch_registers;
|
lin_lwp_ops.to_fetch_registers = lin_lwp_fetch_registers;
|
lin_lwp_ops.to_store_registers = lin_lwp_store_registers;
|
lin_lwp_ops.to_store_registers = lin_lwp_store_registers;
|
lin_lwp_ops.to_xfer_memory = lin_lwp_xfer_memory;
|
lin_lwp_ops.to_xfer_memory = lin_lwp_xfer_memory;
|
lin_lwp_ops.to_kill = lin_lwp_kill;
|
lin_lwp_ops.to_kill = lin_lwp_kill;
|
lin_lwp_ops.to_create_inferior = lin_lwp_create_inferior;
|
lin_lwp_ops.to_create_inferior = lin_lwp_create_inferior;
|
lin_lwp_ops.to_mourn_inferior = lin_lwp_mourn_inferior;
|
lin_lwp_ops.to_mourn_inferior = lin_lwp_mourn_inferior;
|
lin_lwp_ops.to_thread_alive = lin_lwp_thread_alive;
|
lin_lwp_ops.to_thread_alive = lin_lwp_thread_alive;
|
lin_lwp_ops.to_pid_to_str = lin_lwp_pid_to_str;
|
lin_lwp_ops.to_pid_to_str = lin_lwp_pid_to_str;
|
lin_lwp_ops.to_stratum = thread_stratum;
|
lin_lwp_ops.to_stratum = thread_stratum;
|
lin_lwp_ops.to_has_thread_control = tc_schedlock;
|
lin_lwp_ops.to_has_thread_control = tc_schedlock;
|
lin_lwp_ops.to_magic = OPS_MAGIC;
|
lin_lwp_ops.to_magic = OPS_MAGIC;
|
}
|
}
|
|
|
static void
|
static void
|
sigchld_handler (int signo)
|
sigchld_handler (int signo)
|
{
|
{
|
/* Do nothing. The only reason for this handler is that it allows
|
/* Do nothing. The only reason for this handler is that it allows
|
us to use sigsuspend in lin_lwp_wait above to wait for the
|
us to use sigsuspend in lin_lwp_wait above to wait for the
|
arrival of a SIGCHLD. */
|
arrival of a SIGCHLD. */
|
}
|
}
|
|
|
void
|
void
|
_initialize_lin_lwp (void)
|
_initialize_lin_lwp (void)
|
{
|
{
|
struct sigaction action;
|
struct sigaction action;
|
|
|
extern void thread_db_init (struct target_ops *);
|
extern void thread_db_init (struct target_ops *);
|
|
|
init_lin_lwp_ops ();
|
init_lin_lwp_ops ();
|
add_target (&lin_lwp_ops);
|
add_target (&lin_lwp_ops);
|
thread_db_init (&lin_lwp_ops);
|
thread_db_init (&lin_lwp_ops);
|
|
|
/* Save the original signal mask. */
|
/* Save the original signal mask. */
|
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
|
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
|
|
|
action.sa_handler = sigchld_handler;
|
action.sa_handler = sigchld_handler;
|
sigemptyset (&action.sa_mask);
|
sigemptyset (&action.sa_mask);
|
action.sa_flags = 0;
|
action.sa_flags = 0;
|
sigaction (SIGCHLD, &action, NULL);
|
sigaction (SIGCHLD, &action, NULL);
|
|
|
/* Make sure we don't block SIGCHLD during a sigsuspend. */
|
/* Make sure we don't block SIGCHLD during a sigsuspend. */
|
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
|
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
|
sigdelset (&suspend_mask, SIGCHLD);
|
sigdelset (&suspend_mask, SIGCHLD);
|
|
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
add_show_from_set (add_set_cmd ("lin-lwp", no_class, var_zinteger,
|
add_show_from_set (add_set_cmd ("lin-lwp", no_class, var_zinteger,
|
(char *) &debug_lin_lwp,
|
(char *) &debug_lin_lwp,
|
"Set debugging of linux lwp module.\n\
|
"Set debugging of linux lwp module.\n\
|
Enables printf debugging output.\n",
|
Enables printf debugging output.\n",
|
&setdebuglist),
|
&setdebuglist),
|
&showdebuglist);
|
&showdebuglist);
|
}
|
}
|
|
|
|
|
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
|
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
|
the LinuxThreads library and therefore doesn't really belong here. */
|
the LinuxThreads library and therefore doesn't really belong here. */
|
|
|
/* Read variable NAME in the target and return its value if found.
|
/* Read variable NAME in the target and return its value if found.
|
Otherwise return zero. It is assumed that the type of the variable
|
Otherwise return zero. It is assumed that the type of the variable
|
is `int'. */
|
is `int'. */
|
|
|
static int
|
static int
|
get_signo (const char *name)
|
get_signo (const char *name)
|
{
|
{
|
struct minimal_symbol *ms;
|
struct minimal_symbol *ms;
|
int signo;
|
int signo;
|
|
|
ms = lookup_minimal_symbol (name, NULL, NULL);
|
ms = lookup_minimal_symbol (name, NULL, NULL);
|
if (ms == NULL)
|
if (ms == NULL)
|
return 0;
|
return 0;
|
|
|
if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo,
|
if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo,
|
sizeof (signo)) != 0)
|
sizeof (signo)) != 0)
|
return 0;
|
return 0;
|
|
|
return signo;
|
return signo;
|
}
|
}
|
|
|
/* Return the set of signals used by the threads library in *SET. */
|
/* Return the set of signals used by the threads library in *SET. */
|
|
|
void
|
void
|
lin_thread_get_thread_signals (sigset_t *set)
|
lin_thread_get_thread_signals (sigset_t *set)
|
{
|
{
|
struct sigaction action;
|
struct sigaction action;
|
int restart, cancel;
|
int restart, cancel;
|
|
|
sigemptyset (set);
|
sigemptyset (set);
|
|
|
restart = get_signo ("__pthread_sig_restart");
|
restart = get_signo ("__pthread_sig_restart");
|
if (restart == 0)
|
if (restart == 0)
|
return;
|
return;
|
|
|
cancel = get_signo ("__pthread_sig_cancel");
|
cancel = get_signo ("__pthread_sig_cancel");
|
if (cancel == 0)
|
if (cancel == 0)
|
return;
|
return;
|
|
|
sigaddset (set, restart);
|
sigaddset (set, restart);
|
sigaddset (set, cancel);
|
sigaddset (set, cancel);
|
|
|
/* The LinuxThreads library makes terminating threads send a special
|
/* The LinuxThreads library makes terminating threads send a special
|
"cancel" signal instead of SIGCHLD. Make sure we catch those (to
|
"cancel" signal instead of SIGCHLD. Make sure we catch those (to
|
prevent them from terminating GDB itself, which is likely to be
|
prevent them from terminating GDB itself, which is likely to be
|
their default action) and treat them the same way as SIGCHLD. */
|
their default action) and treat them the same way as SIGCHLD. */
|
|
|
action.sa_handler = sigchld_handler;
|
action.sa_handler = sigchld_handler;
|
sigemptyset (&action.sa_mask);
|
sigemptyset (&action.sa_mask);
|
action.sa_flags = 0;
|
action.sa_flags = 0;
|
sigaction (cancel, &action, NULL);
|
sigaction (cancel, &action, NULL);
|
|
|
/* We block the "cancel" signal throughout this code ... */
|
/* We block the "cancel" signal throughout this code ... */
|
sigaddset (&blocked_mask, cancel);
|
sigaddset (&blocked_mask, cancel);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
|
|
/* ... except during a sigsuspend. */
|
/* ... except during a sigsuspend. */
|
sigdelset (&suspend_mask, cancel);
|
sigdelset (&suspend_mask, cancel);
|
}
|
}
|
|
|
