/* Low level interface to ptrace, for the remote server for GDB.
- Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
- 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 1995-1996, 1998-2012 Free Software Foundation, Inc.
This file is part of GDB.
#include "server.h"
#include "linux-low.h"
+#include "linux-osdata.h"
+#include "agent.h"
#include <sys/wait.h>
#include <stdio.h>
#include <sys/param.h>
#include <sys/ptrace.h>
+#include "linux-ptrace.h"
+#include "linux-procfs.h"
#include <signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/vfs.h>
+#include <sys/uio.h>
#ifndef ELFMAG0
/* Don't include <linux/elf.h> here. If it got included by gdb_proc_service.h
then ELFMAG0 will have been defined. If it didn't get included by
#define SPUFS_MAGIC 0x23c9b64e
#endif
-#ifndef PTRACE_GETSIGINFO
-# define PTRACE_GETSIGINFO 0x4202
-# define PTRACE_SETSIGINFO 0x4203
+#ifdef HAVE_PERSONALITY
+# include <sys/personality.h>
+# if !HAVE_DECL_ADDR_NO_RANDOMIZE
+# define ADDR_NO_RANDOMIZE 0x0040000
+# endif
#endif
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
-/* If the system headers did not provide the constants, hard-code the normal
- values. */
-#ifndef PTRACE_EVENT_FORK
-
-#define PTRACE_SETOPTIONS 0x4200
-#define PTRACE_GETEVENTMSG 0x4201
-
-/* options set using PTRACE_SETOPTIONS */
-#define PTRACE_O_TRACESYSGOOD 0x00000001
-#define PTRACE_O_TRACEFORK 0x00000002
-#define PTRACE_O_TRACEVFORK 0x00000004
-#define PTRACE_O_TRACECLONE 0x00000008
-#define PTRACE_O_TRACEEXEC 0x00000010
-#define PTRACE_O_TRACEVFORKDONE 0x00000020
-#define PTRACE_O_TRACEEXIT 0x00000040
-
-/* Wait extended result codes for the above trace options. */
-#define PTRACE_EVENT_FORK 1
-#define PTRACE_EVENT_VFORK 2
-#define PTRACE_EVENT_CLONE 3
-#define PTRACE_EVENT_EXEC 4
-#define PTRACE_EVENT_VFORK_DONE 5
-#define PTRACE_EVENT_EXIT 6
-
-#endif /* PTRACE_EVENT_FORK */
-
-/* We can't always assume that this flag is available, but all systems
- with the ptrace event handlers also have __WALL, so it's safe to use
- in some contexts. */
-#ifndef __WALL
-#define __WALL 0x40000000 /* Wait for any child. */
-#endif
-
#ifndef W_STOPCODE
#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
#endif
+/* This is the kernel's hard limit. Not to be confused with
+ SIGRTMIN. */
+#ifndef __SIGRTMIN
+#define __SIGRTMIN 32
+#endif
+
#ifdef __UCLIBC__
#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
#define HAS_NOMMU
struct inferior_list all_lwps;
-/* A list of all unknown processes which receive stop signals. Some other
- process will presumably claim each of these as forked children
- momentarily. */
+/* A list of all unknown processes which receive stop signals. Some
+ other process will presumably claim each of these as forked
+ children momentarily. */
+
+struct simple_pid_list
+{
+ /* The process ID. */
+ int pid;
+
+ /* The status as reported by waitpid. */
+ int status;
+
+ /* Next in chain. */
+ struct simple_pid_list *next;
+};
+struct simple_pid_list *stopped_pids;
+
+/* Trivial list manipulation functions to keep track of a list of new
+ stopped processes. */
+
+static void
+add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
+{
+ struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
+
+ new_pid->pid = pid;
+ new_pid->status = status;
+ new_pid->next = *listp;
+ *listp = new_pid;
+}
+
+static int
+pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp)
+{
+ struct simple_pid_list **p;
+
+ for (p = listp; *p != NULL; p = &(*p)->next)
+ if ((*p)->pid == pid)
+ {
+ struct simple_pid_list *next = (*p)->next;
-struct inferior_list stopped_pids;
+ *statusp = (*p)->status;
+ xfree (*p);
+ *p = next;
+ return 1;
+ }
+ return 0;
+}
/* FIXME this is a bit of a hack, and could be removed. */
int stopping_threads;
/* FIXME make into a target method? */
int using_threads = 1;
+/* True if we're presently stabilizing threads (moving them out of
+ jump pads). */
+static int stabilizing_threads;
+
/* This flag is true iff we've just created or attached to our first
inferior but it has not stopped yet. As soon as it does, we need
to call the low target's arch_setup callback. Doing this only on
static void linux_resume_one_lwp (struct lwp_info *lwp,
int step, int signal, siginfo_t *info);
static void linux_resume (struct thread_resume *resume_info, size_t n);
-static void stop_all_lwps (void);
+static void stop_all_lwps (int suspend, struct lwp_info *except);
+static void unstop_all_lwps (int unsuspend, struct lwp_info *except);
static int linux_wait_for_event (ptid_t ptid, int *wstat, int options);
static void *add_lwp (ptid_t ptid);
static int linux_stopped_by_watchpoint (void);
static void mark_lwp_dead (struct lwp_info *lwp, int wstat);
-static int linux_core_of_thread (ptid_t ptid);
static void proceed_all_lwps (void);
-static void unstop_all_lwps (struct lwp_info *except);
static int finish_step_over (struct lwp_info *lwp);
static CORE_ADDR get_stop_pc (struct lwp_info *lwp);
static int kill_lwp (unsigned long lwpid, int signo);
+static void linux_enable_event_reporting (int pid);
/* True if the low target can hardware single-step. Such targets
don't need a BREAKPOINT_REINSERT_ADDR callback. */
return (the_low_target.get_pc != NULL);
}
+/* Returns true if this target can support fast tracepoints. This
+ does not mean that the in-process agent has been loaded in the
+ inferior. */
+
+static int
+supports_fast_tracepoints (void)
+{
+ return the_low_target.install_fast_tracepoint_jump_pad != NULL;
+}
+
struct pending_signals
{
int signal;
/* True if we're currently in async mode. */
#define target_is_async_p() (linux_event_pipe[0] != -1)
-static void send_sigstop (struct inferior_list_entry *entry);
+static void send_sigstop (struct lwp_info *lwp);
static void wait_for_sigstop (struct inferior_list_entry *entry);
-/* Accepts an integer PID; Returns a string representing a file that
- can be opened to get info for the child process.
- Space for the result is malloc'd, caller must free. */
-
-char *
-linux_child_pid_to_exec_file (int pid)
-{
- char *name1, *name2;
-
- name1 = xmalloc (MAXPATHLEN);
- name2 = xmalloc (MAXPATHLEN);
- memset (name2, 0, MAXPATHLEN);
-
- sprintf (name1, "/proc/%d/exe", pid);
- if (readlink (name1, name2, MAXPATHLEN) > 0)
- {
- free (name1);
- return name2;
- }
- else
- {
- free (name2);
- return name1;
- }
-}
-
/* Return non-zero if HEADER is a 64-bit ELF file. */
static int
zero if the file is not a 64-bit ELF file,
and -1 if the file is not accessible or doesn't exist. */
-int
+static int
elf_64_file_p (const char *file)
{
Elf64_Ehdr header;
return elf_64_header_p (&header);
}
+/* Accepts an integer PID; Returns true if the executable PID is
+ running is a 64-bit ELF file.. */
+
+int
+linux_pid_exe_is_elf_64_file (int pid)
+{
+ char file[MAXPATHLEN];
+
+ sprintf (file, "/proc/%d/exe", pid);
+ return elf_64_file_p (file);
+}
+
static void
delete_lwp (struct lwp_info *lwp)
{
return proc;
}
-/* Remove a process from the common process list,
- also freeing all private data. */
-
-static void
-linux_remove_process (struct process_info *process)
-{
- struct process_info_private *priv = process->private;
-
- free (priv->arch_private);
- free (priv);
- remove_process (process);
-}
-
/* Wrapper function for waitpid which handles EINTR, and emulates
__WALL for systems where that is not available. */
{
ptid_t ptid;
unsigned long new_pid;
- int ret, status = W_STOPCODE (SIGSTOP);
+ int ret, status;
ptrace (PTRACE_GETEVENTMSG, lwpid_of (event_child), 0, &new_pid);
/* If we haven't already seen the new PID stop, wait for it now. */
- if (! pull_pid_from_list (&stopped_pids, new_pid))
+ if (!pull_pid_from_list (&stopped_pids, new_pid, &status))
{
/* The new child has a pending SIGSTOP. We can't affect it until it
hits the SIGSTOP, but we're already attached. */
warning ("wait returned unexpected status 0x%x", status);
}
- ptrace (PTRACE_SETOPTIONS, new_pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE);
+ linux_enable_event_reporting (new_pid);
ptid = ptid_build (pid_of (event_child), new_pid, 0);
new_lwp = (struct lwp_info *) add_lwp (ptid);
stop_pc = get_pc (lwp);
- if (WSTOPSIG (lwp->last_status) == SIGTRAP && !lwp->stepping)
+ if (WSTOPSIG (lwp->last_status) == SIGTRAP
+ && !lwp->stepping
+ && !lwp->stopped_by_watchpoint
+ && lwp->last_status >> 16 == 0)
stop_pc -= the_low_target.decr_pc_after_break;
if (debug_threads)
lwp->head.id = ptid;
- lwp->last_resume_kind = resume_continue;
-
if (the_low_target.new_thread != NULL)
lwp->arch_private = the_low_target.new_thread ();
static int
linux_create_inferior (char *program, char **allargs)
{
+#ifdef HAVE_PERSONALITY
+ int personality_orig = 0, personality_set = 0;
+#endif
struct lwp_info *new_lwp;
int pid;
ptid_t ptid;
+#ifdef HAVE_PERSONALITY
+ if (disable_randomization)
+ {
+ errno = 0;
+ personality_orig = personality (0xffffffff);
+ if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE))
+ {
+ personality_set = 1;
+ personality (personality_orig | ADDR_NO_RANDOMIZE);
+ }
+ if (errno != 0 || (personality_set
+ && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE)))
+ warning ("Error disabling address space randomization: %s",
+ strerror (errno));
+ }
+#endif
+
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
pid = vfork ();
#else
{
ptrace (PTRACE_TRACEME, 0, 0, 0);
-#ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */
+#ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
signal (__SIGRTMIN + 1, SIG_DFL);
#endif
setpgid (0, 0);
+ /* If gdbserver is connected to gdb via stdio, redirect the inferior's
+ stdout to stderr so that inferior i/o doesn't corrupt the connection.
+ Also, redirect stdin to /dev/null. */
+ if (remote_connection_is_stdio ())
+ {
+ close (0);
+ open ("/dev/null", O_RDONLY);
+ dup2 (2, 1);
+ if (write (2, "stdin/stdout redirected\n",
+ sizeof ("stdin/stdout redirected\n") - 1) < 0)
+ /* Errors ignored. */;
+ }
+
execv (program, allargs);
if (errno == ENOENT)
execvp (program, allargs);
_exit (0177);
}
+#ifdef HAVE_PERSONALITY
+ if (personality_set)
+ {
+ errno = 0;
+ personality (personality_orig);
+ if (errno != 0)
+ warning ("Error restoring address space randomization: %s",
+ strerror (errno));
+ }
+#endif
+
linux_add_process (pid, 0);
ptid = ptid_build (pid, pid, 0);
if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) != 0)
{
+ struct buffer buffer;
+
if (!initial)
{
/* If we fail to attach to an LWP, just warn. */
fflush (stderr);
return;
}
- else
- /* If we fail to attach to a process, report an error. */
- error ("Cannot attach to lwp %ld: %s (%d)\n", lwpid,
- strerror (errno), errno);
+
+ /* If we fail to attach to a process, report an error. */
+ buffer_init (&buffer);
+ linux_ptrace_attach_warnings (lwpid, &buffer);
+ buffer_grow_str0 (&buffer, "");
+ error ("%sCannot attach to lwp %ld: %s (%d)", buffer_finish (&buffer),
+ lwpid, strerror (errno), errno);
}
if (initial)
- /* NOTE/FIXME: This lwp might have not been the tgid. */
+ /* If lwp is the tgid, we handle adding existing threads later.
+ Otherwise we just add lwp without bothering about any other
+ threads. */
ptid = ptid_build (lwpid, lwpid, 0);
else
{
ptrace call on this LWP. */
new_lwp->must_set_ptrace_flags = 1;
+ if (linux_proc_pid_is_stopped (lwpid))
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Attached to a stopped process\n");
+
+ /* The process is definitely stopped. It is in a job control
+ stop, unless the kernel predates the TASK_STOPPED /
+ TASK_TRACED distinction, in which case it might be in a
+ ptrace stop. Make sure it is in a ptrace stop; from there we
+ can kill it, signal it, et cetera.
+
+ First make sure there is a pending SIGSTOP. Since we are
+ already attached, the process can not transition from stopped
+ to running without a PTRACE_CONT; so we know this signal will
+ go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
+ probably already in the queue (unless this kernel is old
+ enough to use TASK_STOPPED for ptrace stops); but since
+ SIGSTOP is not an RT signal, it can only be queued once. */
+ kill_lwp (lwpid, SIGSTOP);
+
+ /* Finally, resume the stopped process. This will deliver the
+ SIGSTOP (or a higher priority signal, just like normal
+ PTRACE_ATTACH), which we'll catch later on. */
+ ptrace (PTRACE_CONT, lwpid, 0, 0);
+ }
+
/* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
brings it to a halt.
of a new thread that is being created.
In this case we should ignore that SIGSTOP and resume the
process. This is handled below by setting stop_expected = 1,
- and the fact that add_lwp sets last_resume_kind ==
+ and the fact that add_thread sets last_resume_kind ==
resume_continue.
2) This is the first thread (the process thread), and we're attaching
In this case we want the process thread to stop.
This is handled by having linux_attach set last_resume_kind ==
resume_stop after we return.
- ??? If the process already has several threads we leave the other
- threads running.
+
+ If the pid we are attaching to is also the tgid, we attach to and
+ stop all the existing threads. Otherwise, we attach to pid and
+ ignore any other threads in the same group as this pid.
3) GDB is connecting to gdbserver and is requesting an enumeration of all
existing threads.
linux_attach_lwp_1 (lwpid, 0);
}
+/* Attach to PID. If PID is the tgid, attach to it and all
+ of its threads. */
+
int
linux_attach (unsigned long pid)
{
- struct lwp_info *lwp;
-
+ /* Attach to PID. We will check for other threads
+ soon. */
linux_attach_lwp_1 (pid, 1);
-
linux_add_process (pid, 1);
if (!non_stop)
{
- /* Don't ignore the initial SIGSTOP if we just attached to this
- process. It will be collected by wait shortly. */
- lwp = (struct lwp_info *) find_inferior_id (&all_lwps,
- ptid_build (pid, pid, 0));
- lwp->last_resume_kind = resume_stop;
+ struct thread_info *thread;
+
+ /* Don't ignore the initial SIGSTOP if we just attached to this
+ process. It will be collected by wait shortly. */
+ thread = find_thread_ptid (ptid_build (pid, pid, 0));
+ thread->last_resume_kind = resume_stop;
+ }
+
+ if (linux_proc_get_tgid (pid) == pid)
+ {
+ DIR *dir;
+ char pathname[128];
+
+ sprintf (pathname, "/proc/%ld/task", pid);
+
+ dir = opendir (pathname);
+
+ if (!dir)
+ {
+ fprintf (stderr, "Could not open /proc/%ld/task.\n", pid);
+ fflush (stderr);
+ }
+ else
+ {
+ /* At this point we attached to the tgid. Scan the task for
+ existing threads. */
+ unsigned long lwp;
+ int new_threads_found;
+ int iterations = 0;
+ struct dirent *dp;
+
+ while (iterations < 2)
+ {
+ new_threads_found = 0;
+ /* Add all the other threads. While we go through the
+ threads, new threads may be spawned. Cycle through
+ the list of threads until we have done two iterations without
+ finding new threads. */
+ while ((dp = readdir (dir)) != NULL)
+ {
+ /* Fetch one lwp. */
+ lwp = strtoul (dp->d_name, NULL, 10);
+
+ /* Is this a new thread? */
+ if (lwp
+ && find_thread_ptid (ptid_build (pid, lwp, 0)) == NULL)
+ {
+ linux_attach_lwp_1 (lwp, 0);
+ new_threads_found++;
+
+ if (debug_threads)
+ fprintf (stderr, "\
+Found and attached to new lwp %ld\n", lwp);
+ }
+ }
+
+ if (!new_threads_found)
+ iterations++;
+ else
+ iterations = 0;
+
+ rewinddir (dir);
+ }
+ closedir (dir);
+ }
}
return 0;
second_thread_of_pid_p, &counter) == NULL);
}
-/* Kill the inferior lwp. */
+/* Kill LWP. */
+
+static void
+linux_kill_one_lwp (struct lwp_info *lwp)
+{
+ int pid = lwpid_of (lwp);
+
+ /* PTRACE_KILL is unreliable. After stepping into a signal handler,
+ there is no signal context, and ptrace(PTRACE_KILL) (or
+ ptrace(PTRACE_CONT, SIGKILL), pretty much the same) acts like
+ ptrace(CONT, pid, 0,0) and just resumes the tracee. A better
+ alternative is to kill with SIGKILL. We only need one SIGKILL
+ per process, not one for each thread. But since we still support
+ linuxthreads, and we also support debugging programs using raw
+ clone without CLONE_THREAD, we send one for each thread. For
+ years, we used PTRACE_KILL only, so we're being a bit paranoid
+ about some old kernels where PTRACE_KILL might work better
+ (dubious if there are any such, but that's why it's paranoia), so
+ we try SIGKILL first, PTRACE_KILL second, and so we're fine
+ everywhere. */
+
+ errno = 0;
+ kill (pid, SIGKILL);
+ if (debug_threads)
+ fprintf (stderr,
+ "LKL: kill (SIGKILL) %s, 0, 0 (%s)\n",
+ target_pid_to_str (ptid_of (lwp)),
+ errno ? strerror (errno) : "OK");
+
+ errno = 0;
+ ptrace (PTRACE_KILL, pid, 0, 0);
+ if (debug_threads)
+ fprintf (stderr,
+ "LKL: PTRACE_KILL %s, 0, 0 (%s)\n",
+ target_pid_to_str (ptid_of (lwp)),
+ errno ? strerror (errno) : "OK");
+}
+
+/* Callback for `find_inferior'. Kills an lwp of a given process,
+ except the leader. */
static int
-linux_kill_one_lwp (struct inferior_list_entry *entry, void *args)
+kill_one_lwp_callback (struct inferior_list_entry *entry, void *args)
{
struct thread_info *thread = (struct thread_info *) entry;
struct lwp_info *lwp = get_thread_lwp (thread);
return 0;
}
- /* If we're killing a running inferior, make sure it is stopped
- first, as PTRACE_KILL will not work otherwise. */
- if (!lwp->stopped)
- send_sigstop (&lwp->head);
-
do
{
- ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
+ linux_kill_one_lwp (lwp);
/* Make sure it died. The loop is most likely unnecessary. */
pid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
{
struct process_info *process;
struct lwp_info *lwp;
- struct thread_info *thread;
int wstat;
int lwpid;
if (process == NULL)
return -1;
- find_inferior (&all_threads, linux_kill_one_lwp, &pid);
+ /* If we're killing a running inferior, make sure it is stopped
+ first, as PTRACE_KILL will not work otherwise. */
+ stop_all_lwps (0, NULL);
+
+ find_inferior (&all_threads, kill_one_lwp_callback , &pid);
/* See the comment in linux_kill_one_lwp. We did not kill the first
thread in the list, so do so now. */
lwp = find_lwp_pid (pid_to_ptid (pid));
- thread = get_lwp_thread (lwp);
- if (debug_threads)
- fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n",
- lwpid_of (lwp), pid);
+ if (lwp == NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n",
+ lwpid_of (lwp), pid);
+ }
+ else
+ {
+ if (debug_threads)
+ fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n",
+ lwpid_of (lwp), pid);
- /* If we're killing a running inferior, make sure it is stopped
- first, as PTRACE_KILL will not work otherwise. */
- if (!lwp->stopped)
- send_sigstop (&lwp->head);
+ do
+ {
+ linux_kill_one_lwp (lwp);
- do
- {
- ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
+ /* Make sure it died. The loop is most likely unnecessary. */
+ lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
+ } while (lwpid > 0 && WIFSTOPPED (wstat));
+ }
- /* Make sure it died. The loop is most likely unnecessary. */
- lwpid = linux_wait_for_event (lwp->head.id, &wstat, __WALL);
- } while (lwpid > 0 && WIFSTOPPED (wstat));
+ the_target->mourn (process);
-#ifdef USE_THREAD_DB
- thread_db_free (process, 0);
-#endif
- delete_lwp (lwp);
- linux_remove_process (process);
+ /* Since we presently can only stop all lwps of all processes, we
+ need to unstop lwps of other processes. */
+ unstop_all_lwps (0, NULL);
return 0;
}
+/* Get pending signal of THREAD, for detaching purposes. This is the
+ signal the thread last stopped for, which we need to deliver to the
+ thread when detaching, otherwise, it'd be suppressed/lost. */
+
static int
-linux_detach_one_lwp (struct inferior_list_entry *entry, void *args)
+get_detach_signal (struct thread_info *thread)
{
- struct thread_info *thread = (struct thread_info *) entry;
- struct lwp_info *lwp = get_thread_lwp (thread);
- int pid = * (int *) args;
+ enum target_signal signo = TARGET_SIGNAL_0;
+ int status;
+ struct lwp_info *lp = get_thread_lwp (thread);
- if (ptid_get_pid (entry->id) != pid)
- return 0;
+ if (lp->status_pending_p)
+ status = lp->status_pending;
+ else
+ {
+ /* If the thread had been suspended by gdbserver, and it stopped
+ cleanly, then it'll have stopped with SIGSTOP. But we don't
+ want to deliver that SIGSTOP. */
+ if (thread->last_status.kind != TARGET_WAITKIND_STOPPED
+ || thread->last_status.value.sig == TARGET_SIGNAL_0)
+ return 0;
- /* If we're detaching from a running inferior, make sure it is
- stopped first, as PTRACE_DETACH will not work otherwise. */
- if (!lwp->stopped)
+ /* Otherwise, we may need to deliver the signal we
+ intercepted. */
+ status = lp->last_status;
+ }
+
+ if (!WIFSTOPPED (status))
{
- int lwpid = lwpid_of (lwp);
+ if (debug_threads)
+ fprintf (stderr,
+ "GPS: lwp %s hasn't stopped: no pending signal\n",
+ target_pid_to_str (ptid_of (lp)));
+ return 0;
+ }
- stopping_threads = 1;
- send_sigstop (&lwp->head);
+ /* Extended wait statuses aren't real SIGTRAPs. */
+ if (WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "GPS: lwp %s had stopped with extended "
+ "status: no pending signal\n",
+ target_pid_to_str (ptid_of (lp)));
+ return 0;
+ }
- /* If this detects a new thread through a clone event, the new
- thread is appended to the end of the lwp list, so we'll
- eventually detach from it. */
- wait_for_sigstop (&lwp->head);
- stopping_threads = 0;
+ signo = target_signal_from_host (WSTOPSIG (status));
- /* If LWP exits while we're trying to stop it, there's nothing
- left to do. */
- lwp = find_lwp_pid (pid_to_ptid (lwpid));
- if (lwp == NULL)
- return 0;
+ if (program_signals_p && !program_signals[signo])
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "GPS: lwp %s had signal %s, but it is in nopass state\n",
+ target_pid_to_str (ptid_of (lp)),
+ target_signal_to_string (signo));
+ return 0;
+ }
+ else if (!program_signals_p
+ /* If we have no way to know which signals GDB does not
+ want to have passed to the program, assume
+ SIGTRAP/SIGINT, which is GDB's default. */
+ && (signo == TARGET_SIGNAL_TRAP || signo == TARGET_SIGNAL_INT))
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "GPS: lwp %s had signal %s, "
+ "but we don't know if we should pass it. Default to not.\n",
+ target_pid_to_str (ptid_of (lp)),
+ target_signal_to_string (signo));
+ return 0;
+ }
+ else
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "GPS: lwp %s has pending signal %s: delivering it.\n",
+ target_pid_to_str (ptid_of (lp)),
+ target_signal_to_string (signo));
+
+ return WSTOPSIG (status);
}
+}
+
+static int
+linux_detach_one_lwp (struct inferior_list_entry *entry, void *args)
+{
+ struct thread_info *thread = (struct thread_info *) entry;
+ struct lwp_info *lwp = get_thread_lwp (thread);
+ int pid = * (int *) args;
+ int sig;
- /* If this process is stopped but is expecting a SIGSTOP, then make
- sure we take care of that now. This isn't absolutely guaranteed
- to collect the SIGSTOP, but is fairly likely to. */
+ if (ptid_get_pid (entry->id) != pid)
+ return 0;
+
+ /* If there is a pending SIGSTOP, get rid of it. */
if (lwp->stop_expected)
{
- int wstat;
- /* Clear stop_expected, so that the SIGSTOP will be reported. */
+ if (debug_threads)
+ fprintf (stderr,
+ "Sending SIGCONT to %s\n",
+ target_pid_to_str (ptid_of (lwp)));
+
+ kill_lwp (lwpid_of (lwp), SIGCONT);
lwp->stop_expected = 0;
- if (lwp->stopped)
- linux_resume_one_lwp (lwp, 0, 0, NULL);
- linux_wait_for_event (lwp->head.id, &wstat, __WALL);
}
/* Flush any pending changes to the process's registers. */
regcache_invalidate_one ((struct inferior_list_entry *)
get_lwp_thread (lwp));
+ /* Pass on any pending signal for this thread. */
+ sig = get_detach_signal (thread);
+
/* Finally, let it resume. */
- ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0);
+ if (the_low_target.prepare_to_resume != NULL)
+ the_low_target.prepare_to_resume (lwp);
+ if (ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, sig) < 0)
+ error (_("Can't detach %s: %s"),
+ target_pid_to_str (ptid_of (lwp)),
+ strerror (errno));
delete_lwp (lwp);
return 0;
}
-static int
-any_thread_of (struct inferior_list_entry *entry, void *args)
-{
- int *pid_p = args;
-
- if (ptid_get_pid (entry->id) == *pid_p)
- return 1;
-
- return 0;
-}
-
static int
linux_detach (int pid)
{
if (process == NULL)
return -1;
+ /* Stop all threads before detaching. First, ptrace requires that
+ the thread is stopped to sucessfully detach. Second, thread_db
+ may need to uninstall thread event breakpoints from memory, which
+ only works with a stopped process anyway. */
+ stop_all_lwps (0, NULL);
+
#ifdef USE_THREAD_DB
- thread_db_free (process, 1);
+ thread_db_detach (process);
#endif
- current_inferior =
- (struct thread_info *) find_inferior (&all_threads, any_thread_of, &pid);
+ /* Stabilize threads (move out of jump pads). */
+ stabilize_threads ();
- delete_all_breakpoints ();
find_inferior (&all_threads, linux_detach_one_lwp, &pid);
- linux_remove_process (process);
+
+ the_target->mourn (process);
+
+ /* Since we presently can only stop all lwps of all processes, we
+ need to unstop lwps of other processes. */
+ unstop_all_lwps (0, NULL);
+ return 0;
+}
+
+/* Remove all LWPs that belong to process PROC from the lwp list. */
+
+static int
+delete_lwp_callback (struct inferior_list_entry *entry, void *proc)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+ struct process_info *process = proc;
+
+ if (pid_of (lwp) == pid_of (process))
+ delete_lwp (lwp);
+
return 0;
}
+static void
+linux_mourn (struct process_info *process)
+{
+ struct process_info_private *priv;
+
+#ifdef USE_THREAD_DB
+ thread_db_mourn (process);
+#endif
+
+ find_inferior (&all_lwps, delete_lwp_callback, process);
+
+ /* Freeing all private data. */
+ priv = process->private;
+ free (priv->arch_private);
+ free (priv);
+ process->private = NULL;
+
+ remove_process (process);
+}
+
static void
linux_join (int pid)
{
int status, ret;
- struct process_info *process;
-
- process = find_process_pid (pid);
- if (process == NULL)
- return;
do {
ret = my_waitpid (pid, &status, 0);
{
struct lwp_info *lwp = (struct lwp_info *) entry;
ptid_t ptid = * (ptid_t *) arg;
- struct thread_info *thread = get_lwp_thread (lwp);
+ struct thread_info *thread;
/* Check if we're only interested in events from a specific process
or its lwps. */
/* If we got a `vCont;t', but we haven't reported a stop yet, do
report any status pending the LWP may have. */
- if (lwp->last_resume_kind == resume_stop
- && thread->last_status.kind == TARGET_WAITKIND_STOPPED)
+ if (thread->last_resume_kind == resume_stop
+ && thread->last_status.kind != TARGET_WAITKIND_IGNORE)
return 0;
return lwp->status_pending_p;
was reported to us by the kernel. Save its PID. */
if (child == NULL && WIFSTOPPED (*wstatp))
{
- add_pid_to_list (&stopped_pids, ret);
+ add_to_pid_list (&stopped_pids, ret, *wstatp);
goto retry;
}
else if (child == NULL)
return child;
}
-/* Arrange for a breakpoint to be hit again later. We don't keep the
- SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
- will handle the current event, eventually we will resume this LWP,
- and this breakpoint will trap again. */
+/* This function should only be called if the LWP got a SIGTRAP.
+
+ Handle any tracepoint steps or hits. Return true if a tracepoint
+ event was handled, 0 otherwise. */
static int
-cancel_breakpoint (struct lwp_info *lwp)
+handle_tracepoints (struct lwp_info *lwp)
{
- struct thread_info *saved_inferior;
- struct regcache *regcache;
+ struct thread_info *tinfo = get_lwp_thread (lwp);
+ int tpoint_related_event = 0;
- /* There's nothing to do if we don't support breakpoints. */
- if (!supports_breakpoints ())
+ /* If this tracepoint hit causes a tracing stop, we'll immediately
+ uninsert tracepoints. To do this, we temporarily pause all
+ threads, unpatch away, and then unpause threads. We need to make
+ sure the unpausing doesn't resume LWP too. */
+ lwp->suspended++;
+
+ /* And we need to be sure that any all-threads-stopping doesn't try
+ to move threads out of the jump pads, as it could deadlock the
+ inferior (LWP could be in the jump pad, maybe even holding the
+ lock.) */
+
+ /* Do any necessary step collect actions. */
+ tpoint_related_event |= tracepoint_finished_step (tinfo, lwp->stop_pc);
+
+ tpoint_related_event |= handle_tracepoint_bkpts (tinfo, lwp->stop_pc);
+
+ /* See if we just hit a tracepoint and do its main collect
+ actions. */
+ tpoint_related_event |= tracepoint_was_hit (tinfo, lwp->stop_pc);
+
+ lwp->suspended--;
+
+ gdb_assert (lwp->suspended == 0);
+ gdb_assert (!stabilizing_threads || lwp->collecting_fast_tracepoint);
+
+ if (tpoint_related_event)
+ {
+ if (debug_threads)
+ fprintf (stderr, "got a tracepoint event\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+/* Convenience wrapper. Returns true if LWP is presently collecting a
+ fast tracepoint. */
+
+static int
+linux_fast_tracepoint_collecting (struct lwp_info *lwp,
+ struct fast_tpoint_collect_status *status)
+{
+ CORE_ADDR thread_area;
+
+ if (the_low_target.get_thread_area == NULL)
+ return 0;
+
+ /* Get the thread area address. This is used to recognize which
+ thread is which when tracing with the in-process agent library.
+ We don't read anything from the address, and treat it as opaque;
+ it's the address itself that we assume is unique per-thread. */
+ if ((*the_low_target.get_thread_area) (lwpid_of (lwp), &thread_area) == -1)
return 0;
- if (lwp->stepping)
+ return fast_tracepoint_collecting (thread_area, lwp->stop_pc, status);
+}
+
+/* The reason we resume in the caller, is because we want to be able
+ to pass lwp->status_pending as WSTAT, and we need to clear
+ status_pending_p before resuming, otherwise, linux_resume_one_lwp
+ refuses to resume. */
+
+static int
+maybe_move_out_of_jump_pad (struct lwp_info *lwp, int *wstat)
+{
+ struct thread_info *saved_inferior;
+
+ saved_inferior = current_inferior;
+ current_inferior = get_lwp_thread (lwp);
+
+ if ((wstat == NULL
+ || (WIFSTOPPED (*wstat) && WSTOPSIG (*wstat) != SIGTRAP))
+ && supports_fast_tracepoints ()
+ && agent_loaded_p ())
{
+ struct fast_tpoint_collect_status status;
+ int r;
+
if (debug_threads)
+ fprintf (stderr, "\
+Checking whether LWP %ld needs to move out of the jump pad.\n",
+ lwpid_of (lwp));
+
+ r = linux_fast_tracepoint_collecting (lwp, &status);
+
+ if (wstat == NULL
+ || (WSTOPSIG (*wstat) != SIGILL
+ && WSTOPSIG (*wstat) != SIGFPE
+ && WSTOPSIG (*wstat) != SIGSEGV
+ && WSTOPSIG (*wstat) != SIGBUS))
+ {
+ lwp->collecting_fast_tracepoint = r;
+
+ if (r != 0)
+ {
+ if (r == 1 && lwp->exit_jump_pad_bkpt == NULL)
+ {
+ /* Haven't executed the original instruction yet.
+ Set breakpoint there, and wait till it's hit,
+ then single-step until exiting the jump pad. */
+ lwp->exit_jump_pad_bkpt
+ = set_breakpoint_at (status.adjusted_insn_addr, NULL);
+ }
+
+ if (debug_threads)
+ fprintf (stderr, "\
+Checking whether LWP %ld needs to move out of the jump pad...it does\n",
+ lwpid_of (lwp));
+ current_inferior = saved_inferior;
+
+ return 1;
+ }
+ }
+ else
+ {
+ /* If we get a synchronous signal while collecting, *and*
+ while executing the (relocated) original instruction,
+ reset the PC to point at the tpoint address, before
+ reporting to GDB. Otherwise, it's an IPA lib bug: just
+ report the signal to GDB, and pray for the best. */
+
+ lwp->collecting_fast_tracepoint = 0;
+
+ if (r != 0
+ && (status.adjusted_insn_addr <= lwp->stop_pc
+ && lwp->stop_pc < status.adjusted_insn_addr_end))
+ {
+ siginfo_t info;
+ struct regcache *regcache;
+
+ /* The si_addr on a few signals references the address
+ of the faulting instruction. Adjust that as
+ well. */
+ if ((WSTOPSIG (*wstat) == SIGILL
+ || WSTOPSIG (*wstat) == SIGFPE
+ || WSTOPSIG (*wstat) == SIGBUS
+ || WSTOPSIG (*wstat) == SIGSEGV)
+ && ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &info) == 0
+ /* Final check just to make sure we don't clobber
+ the siginfo of non-kernel-sent signals. */
+ && (uintptr_t) info.si_addr == lwp->stop_pc)
+ {
+ info.si_addr = (void *) (uintptr_t) status.tpoint_addr;
+ ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &info);
+ }
+
+ regcache = get_thread_regcache (get_lwp_thread (lwp), 1);
+ (*the_low_target.set_pc) (regcache, status.tpoint_addr);
+ lwp->stop_pc = status.tpoint_addr;
+
+ /* Cancel any fast tracepoint lock this thread was
+ holding. */
+ force_unlock_trace_buffer ();
+ }
+
+ if (lwp->exit_jump_pad_bkpt != NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Cancelling fast exit-jump-pad: removing bkpt. "
+ "stopping all threads momentarily.\n");
+
+ stop_all_lwps (1, lwp);
+ cancel_breakpoints ();
+
+ delete_breakpoint (lwp->exit_jump_pad_bkpt);
+ lwp->exit_jump_pad_bkpt = NULL;
+
+ unstop_all_lwps (1, lwp);
+
+ gdb_assert (lwp->suspended >= 0);
+ }
+ }
+ }
+
+ if (debug_threads)
+ fprintf (stderr, "\
+Checking whether LWP %ld needs to move out of the jump pad...no\n",
+ lwpid_of (lwp));
+
+ current_inferior = saved_inferior;
+ return 0;
+}
+
+/* Enqueue one signal in the "signals to report later when out of the
+ jump pad" list. */
+
+static void
+enqueue_one_deferred_signal (struct lwp_info *lwp, int *wstat)
+{
+ struct pending_signals *p_sig;
+
+ if (debug_threads)
+ fprintf (stderr, "\
+Deferring signal %d for LWP %ld.\n", WSTOPSIG (*wstat), lwpid_of (lwp));
+
+ if (debug_threads)
+ {
+ struct pending_signals *sig;
+
+ for (sig = lwp->pending_signals_to_report;
+ sig != NULL;
+ sig = sig->prev)
fprintf (stderr,
- "CB: [%s] is stepping\n",
- target_pid_to_str (lwp->head.id));
- return 0;
+ " Already queued %d\n",
+ sig->signal);
+
+ fprintf (stderr, " (no more currently queued signals)\n");
+ }
+
+ /* Don't enqueue non-RT signals if they are already in the deferred
+ queue. (SIGSTOP being the easiest signal to see ending up here
+ twice) */
+ if (WSTOPSIG (*wstat) < __SIGRTMIN)
+ {
+ struct pending_signals *sig;
+
+ for (sig = lwp->pending_signals_to_report;
+ sig != NULL;
+ sig = sig->prev)
+ {
+ if (sig->signal == WSTOPSIG (*wstat))
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Not requeuing already queued non-RT signal %d"
+ " for LWP %ld\n",
+ sig->signal,
+ lwpid_of (lwp));
+ return;
+ }
+ }
+ }
+
+ p_sig = xmalloc (sizeof (*p_sig));
+ p_sig->prev = lwp->pending_signals_to_report;
+ p_sig->signal = WSTOPSIG (*wstat);
+ memset (&p_sig->info, 0, sizeof (siginfo_t));
+ ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &p_sig->info);
+
+ lwp->pending_signals_to_report = p_sig;
+}
+
+/* Dequeue one signal from the "signals to report later when out of
+ the jump pad" list. */
+
+static int
+dequeue_one_deferred_signal (struct lwp_info *lwp, int *wstat)
+{
+ if (lwp->pending_signals_to_report != NULL)
+ {
+ struct pending_signals **p_sig;
+
+ p_sig = &lwp->pending_signals_to_report;
+ while ((*p_sig)->prev != NULL)
+ p_sig = &(*p_sig)->prev;
+
+ *wstat = W_STOPCODE ((*p_sig)->signal);
+ if ((*p_sig)->info.si_signo != 0)
+ ptrace (PTRACE_SETSIGINFO, lwpid_of (lwp), 0, &(*p_sig)->info);
+ free (*p_sig);
+ *p_sig = NULL;
+
+ if (debug_threads)
+ fprintf (stderr, "Reporting deferred signal %d for LWP %ld.\n",
+ WSTOPSIG (*wstat), lwpid_of (lwp));
+
+ if (debug_threads)
+ {
+ struct pending_signals *sig;
+
+ for (sig = lwp->pending_signals_to_report;
+ sig != NULL;
+ sig = sig->prev)
+ fprintf (stderr,
+ " Still queued %d\n",
+ sig->signal);
+
+ fprintf (stderr, " (no more queued signals)\n");
+ }
+
+ return 1;
}
- regcache = get_thread_regcache (get_lwp_thread (lwp), 1);
+ return 0;
+}
+
+/* Arrange for a breakpoint to be hit again later. We don't keep the
+ SIGTRAP status and don't forward the SIGTRAP signal to the LWP. We
+ will handle the current event, eventually we will resume this LWP,
+ and this breakpoint will trap again. */
+
+static int
+cancel_breakpoint (struct lwp_info *lwp)
+{
+ struct thread_info *saved_inferior;
+
+ /* There's nothing to do if we don't support breakpoints. */
+ if (!supports_breakpoints ())
+ return 0;
/* breakpoint_at reads from current inferior. */
saved_inferior = current_inferior;
if (debug_threads)
fprintf (stderr,
"CB: Push back breakpoint for %s\n",
- target_pid_to_str (lwp->head.id));
+ target_pid_to_str (ptid_of (lwp)));
/* Back up the PC if necessary. */
if (the_low_target.decr_pc_after_break)
{
struct regcache *regcache
- = get_thread_regcache (get_lwp_thread (lwp), 1);
+ = get_thread_regcache (current_inferior, 1);
(*the_low_target.set_pc) (regcache, lwp->stop_pc);
}
fprintf (stderr,
"CB: No breakpoint found at %s for [%s]\n",
paddress (lwp->stop_pc),
- target_pid_to_str (lwp->head.id));
+ target_pid_to_str (ptid_of (lwp)));
}
current_inferior = saved_inferior;
the stopped child otherwise. */
static int
-linux_wait_for_event_1 (ptid_t ptid, int *wstat, int options)
+linux_wait_for_event (ptid_t ptid, int *wstat, int options)
{
struct lwp_info *event_child, *requested_child;
+ ptid_t wait_ptid;
event_child = NULL;
requested_child = NULL;
/* Check for a lwp with a pending status. */
- if (ptid_equal (ptid, minus_one_ptid)
- || ptid_equal (pid_to_ptid (ptid_get_pid (ptid)), ptid))
+ if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))
{
event_child = (struct lwp_info *)
find_inferior (&all_lwps, status_pending_p_callback, &ptid);
{
requested_child = find_lwp_pid (ptid);
+ if (!stopping_threads
+ && requested_child->status_pending_p
+ && requested_child->collecting_fast_tracepoint)
+ {
+ enqueue_one_deferred_signal (requested_child,
+ &requested_child->status_pending);
+ requested_child->status_pending_p = 0;
+ requested_child->status_pending = 0;
+ linux_resume_one_lwp (requested_child, 0, 0, NULL);
+ }
+
+ if (requested_child->suspended
+ && requested_child->status_pending_p)
+ fatal ("requesting an event out of a suspended child?");
+
if (requested_child->status_pending_p)
event_child = requested_child;
}
return lwpid_of (event_child);
}
+ if (ptid_is_pid (ptid))
+ {
+ /* A request to wait for a specific tgid. This is not possible
+ with waitpid, so instead, we wait for any child, and leave
+ children we're not interested in right now with a pending
+ status to report later. */
+ wait_ptid = minus_one_ptid;
+ }
+ else
+ wait_ptid = ptid;
+
/* We only enter this loop if no process has a pending wait status. Thus
any action taken in response to a wait status inside this loop is
responding as soon as we detect the status, not after any pending
events. */
while (1)
{
- event_child = linux_wait_for_lwp (ptid, wstat, options);
+ event_child = linux_wait_for_lwp (wait_ptid, wstat, options);
if ((options & WNOHANG) && event_child == NULL)
{
if (event_child == NULL)
error ("event from unknown child");
+ if (ptid_is_pid (ptid)
+ && ptid_get_pid (ptid) != ptid_get_pid (ptid_of (event_child)))
+ {
+ if (! WIFSTOPPED (*wstat))
+ mark_lwp_dead (event_child, *wstat);
+ else
+ {
+ event_child->status_pending_p = 1;
+ event_child->status_pending = *wstat;
+ }
+ continue;
+ }
+
current_inferior = get_lwp_thread (event_child);
/* Check for thread exit. */
/* Cancel the step-over operation --- the thread that
started it is gone. */
if (finish_step_over (event_child))
- unstop_all_lwps (event_child);
+ unstop_all_lwps (1, event_child);
delete_lwp (event_child);
return lwpid;
}
if (event_child->must_set_ptrace_flags)
{
- ptrace (PTRACE_SETOPTIONS, lwpid_of (event_child),
- 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE);
+ linux_enable_event_reporting (lwpid_of (event_child));
event_child->must_set_ptrace_flags = 0;
}
continue;
}
- /* If GDB is not interested in this signal, don't stop other
- threads, and don't report it to GDB. Just resume the
- inferior right away. We do this for threading-related
- signals as well as any that GDB specifically requested we
- ignore. But never ignore SIGSTOP if we sent it ourselves,
- and do not ignore signals when stepping - they may require
- special handling to skip the signal handler. */
- /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
- thread library? */
- if (WIFSTOPPED (*wstat)
- && !event_child->stepping
- && (
-#if defined (USE_THREAD_DB) && defined (__SIGRTMIN)
- (current_process ()->private->thread_db != NULL
- && (WSTOPSIG (*wstat) == __SIGRTMIN
- || WSTOPSIG (*wstat) == __SIGRTMIN + 1))
- ||
-#endif
- (pass_signals[target_signal_from_host (WSTOPSIG (*wstat))]
- && !(WSTOPSIG (*wstat) == SIGSTOP
- && event_child->stop_expected))))
- {
- siginfo_t info, *info_p;
-
- if (debug_threads)
- fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
- WSTOPSIG (*wstat), lwpid_of (event_child));
-
- if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0)
- info_p = &info;
- else
- info_p = NULL;
- linux_resume_one_lwp (event_child, event_child->stepping,
- WSTOPSIG (*wstat), info_p);
- continue;
- }
-
if (WIFSTOPPED (*wstat)
&& WSTOPSIG (*wstat) == SIGSTOP
&& event_child->stop_expected)
fprintf (stderr, "Expected stop.\n");
event_child->stop_expected = 0;
- should_stop = (event_child->last_resume_kind == resume_stop
+ should_stop = (current_inferior->last_resume_kind == resume_stop
|| stopping_threads);
if (!should_stop)
return 0;
}
-static int
-linux_wait_for_event (ptid_t ptid, int *wstat, int options)
-{
- ptid_t wait_ptid;
-
- if (ptid_is_pid (ptid))
- {
- /* A request to wait for a specific tgid. This is not possible
- with waitpid, so instead, we wait for any child, and leave
- children we're not interested in right now with a pending
- status to report later. */
- wait_ptid = minus_one_ptid;
- }
- else
- wait_ptid = ptid;
-
- while (1)
- {
- int event_pid;
-
- event_pid = linux_wait_for_event_1 (wait_ptid, wstat, options);
-
- if (event_pid > 0
- && ptid_is_pid (ptid) && ptid_get_pid (ptid) != event_pid)
- {
- struct lwp_info *event_child = find_lwp_pid (pid_to_ptid (event_pid));
-
- if (! WIFSTOPPED (*wstat))
- mark_lwp_dead (event_child, *wstat);
- else
- {
- event_child->status_pending_p = 1;
- event_child->status_pending = *wstat;
- }
- }
- else
- return event_pid;
- }
-}
-
-
/* Count the LWP's that have had events. */
static int
count_events_callback (struct inferior_list_entry *entry, void *data)
{
struct lwp_info *lp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lp);
int *count = data;
gdb_assert (count != NULL);
/* Count only resumed LWPs that have a SIGTRAP event pending that
should be reported to GDB. */
- if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE
- && lp->last_resume_kind != resume_stop
+ if (thread->last_status.kind == TARGET_WAITKIND_IGNORE
+ && thread->last_resume_kind != resume_stop
&& lp->status_pending_p
&& WIFSTOPPED (lp->status_pending)
&& WSTOPSIG (lp->status_pending) == SIGTRAP
select_singlestep_lwp_callback (struct inferior_list_entry *entry, void *data)
{
struct lwp_info *lp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lp);
- if (get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE
- && lp->last_resume_kind == resume_step
+ if (thread->last_status.kind == TARGET_WAITKIND_IGNORE
+ && thread->last_resume_kind == resume_step
&& lp->status_pending_p)
return 1;
else
select_event_lwp_callback (struct inferior_list_entry *entry, void *data)
{
struct lwp_info *lp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lp);
int *selector = data;
gdb_assert (selector != NULL);
/* Select only resumed LWPs that have a SIGTRAP event pending. */
- if (lp->last_resume_kind != resume_stop
- && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE
+ if (thread->last_resume_kind != resume_stop
+ && thread->last_status.kind == TARGET_WAITKIND_IGNORE
&& lp->status_pending_p
&& WIFSTOPPED (lp->status_pending)
&& WSTOPSIG (lp->status_pending) == SIGTRAP
cancel_breakpoints_callback (struct inferior_list_entry *entry, void *data)
{
struct lwp_info *lp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lp);
struct lwp_info *event_lp = data;
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
delete or disable the breakpoint, but the LWP will have already
tripped on it. */
- if (lp->last_resume_kind != resume_stop
- && get_lwp_thread (lp)->last_status.kind == TARGET_WAITKIND_IGNORE
+ if (thread->last_resume_kind != resume_stop
+ && thread->last_status.kind == TARGET_WAITKIND_IGNORE
&& lp->status_pending_p
&& WIFSTOPPED (lp->status_pending)
&& WSTOPSIG (lp->status_pending) == SIGTRAP
+ && !lp->stepping
+ && !lp->stopped_by_watchpoint
&& cancel_breakpoint (lp))
/* Throw away the SIGTRAP. */
lp->status_pending_p = 0;
return 0;
}
+static void
+linux_cancel_breakpoints (void)
+{
+ find_inferior (&all_lwps, cancel_breakpoints_callback, NULL);
+}
+
/* Select one LWP out of those that have events pending. */
static void
}
}
-/* Set this inferior LWP's state as "want-stopped". We won't resume
- this LWP until the client gives us another action for it. */
+/* Decrement the suspend count of an LWP. */
-static void
-gdb_wants_lwp_stopped (struct inferior_list_entry *entry)
+static int
+unsuspend_one_lwp (struct inferior_list_entry *entry, void *except)
{
struct lwp_info *lwp = (struct lwp_info *) entry;
- struct thread_info *thread = get_lwp_thread (lwp);
- /* Most threads are stopped implicitly (all-stop); tag that with
- signal 0. The thread being explicitly reported stopped to the
- client, gets it's status fixed up afterwards. */
- thread->last_status.kind = TARGET_WAITKIND_STOPPED;
- thread->last_status.value.sig = TARGET_SIGNAL_0;
+ /* Ignore EXCEPT. */
+ if (lwp == except)
+ return 0;
+
+ lwp->suspended--;
- lwp->last_resume_kind = resume_stop;
+ gdb_assert (lwp->suspended >= 0);
+ return 0;
}
-/* Set all LWP's states as "want-stopped". */
+/* Decrement the suspend count of all LWPs, except EXCEPT, if non
+ NULL. */
static void
-gdb_wants_all_stopped (void)
+unsuspend_all_lwps (struct lwp_info *except)
{
- for_each_inferior (&all_lwps, gdb_wants_lwp_stopped);
+ find_inferior (&all_lwps, unsuspend_one_lwp, except);
}
-/* Wait for process, returns status. */
+static void move_out_of_jump_pad_callback (struct inferior_list_entry *entry);
+static int stuck_in_jump_pad_callback (struct inferior_list_entry *entry,
+ void *data);
+static int lwp_running (struct inferior_list_entry *entry, void *data);
+static ptid_t linux_wait_1 (ptid_t ptid,
+ struct target_waitstatus *ourstatus,
+ int target_options);
+
+/* Stabilize threads (move out of jump pads).
+
+ If a thread is midway collecting a fast tracepoint, we need to
+ finish the collection and move it out of the jump pad before
+ reporting the signal.
+
+ This avoids recursion while collecting (when a signal arrives
+ midway, and the signal handler itself collects), which would trash
+ the trace buffer. In case the user set a breakpoint in a signal
+ handler, this avoids the backtrace showing the jump pad, etc..
+ Most importantly, there are certain things we can't do safely if
+ threads are stopped in a jump pad (or in its callee's). For
+ example:
+
+ - starting a new trace run. A thread still collecting the
+ previous run, could trash the trace buffer when resumed. The trace
+ buffer control structures would have been reset but the thread had
+ no way to tell. The thread could even midway memcpy'ing to the
+ buffer, which would mean that when resumed, it would clobber the
+ trace buffer that had been set for a new run.
+
+ - we can't rewrite/reuse the jump pads for new tracepoints
+ safely. Say you do tstart while a thread is stopped midway while
+ collecting. When the thread is later resumed, it finishes the
+ collection, and returns to the jump pad, to execute the original
+ instruction that was under the tracepoint jump at the time the
+ older run had been started. If the jump pad had been rewritten
+ since for something else in the new run, the thread would now
+ execute the wrong / random instructions. */
-static ptid_t
-linux_wait_1 (ptid_t ptid,
- struct target_waitstatus *ourstatus, int target_options)
+static void
+linux_stabilize_threads (void)
{
- int w;
- struct thread_info *thread = NULL;
- struct lwp_info *event_child = NULL;
- int options;
- int pid;
- int step_over_finished;
- int bp_explains_trap;
- int maybe_internal_trap;
- int report_to_gdb;
+ struct thread_info *save_inferior;
+ struct lwp_info *lwp_stuck;
- /* Translate generic target options into linux options. */
- options = __WALL;
- if (target_options & TARGET_WNOHANG)
- options |= WNOHANG;
+ lwp_stuck
+ = (struct lwp_info *) find_inferior (&all_lwps,
+ stuck_in_jump_pad_callback, NULL);
+ if (lwp_stuck != NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr, "can't stabilize, LWP %ld is stuck in jump pad\n",
+ lwpid_of (lwp_stuck));
+ return;
+ }
-retry:
- ourstatus->kind = TARGET_WAITKIND_IGNORE;
+ save_inferior = current_inferior;
- /* If we were only supposed to resume one thread, only wait for
- that thread - if it's still alive. If it died, however - which
- can happen if we're coming from the thread death case below -
+ stabilizing_threads = 1;
+
+ /* Kick 'em all. */
+ for_each_inferior (&all_lwps, move_out_of_jump_pad_callback);
+
+ /* Loop until all are stopped out of the jump pads. */
+ while (find_inferior (&all_lwps, lwp_running, NULL) != NULL)
+ {
+ struct target_waitstatus ourstatus;
+ struct lwp_info *lwp;
+ int wstat;
+
+ /* Note that we go through the full wait even loop. While
+ moving threads out of jump pad, we need to be able to step
+ over internal breakpoints and such. */
+ linux_wait_1 (minus_one_ptid, &ourstatus, 0);
+
+ if (ourstatus.kind == TARGET_WAITKIND_STOPPED)
+ {
+ lwp = get_thread_lwp (current_inferior);
+
+ /* Lock it. */
+ lwp->suspended++;
+
+ if (ourstatus.value.sig != TARGET_SIGNAL_0
+ || current_inferior->last_resume_kind == resume_stop)
+ {
+ wstat = W_STOPCODE (target_signal_to_host (ourstatus.value.sig));
+ enqueue_one_deferred_signal (lwp, &wstat);
+ }
+ }
+ }
+
+ find_inferior (&all_lwps, unsuspend_one_lwp, NULL);
+
+ stabilizing_threads = 0;
+
+ current_inferior = save_inferior;
+
+ if (debug_threads)
+ {
+ lwp_stuck
+ = (struct lwp_info *) find_inferior (&all_lwps,
+ stuck_in_jump_pad_callback, NULL);
+ if (lwp_stuck != NULL)
+ fprintf (stderr, "couldn't stabilize, LWP %ld got stuck in jump pad\n",
+ lwpid_of (lwp_stuck));
+ }
+}
+
+/* Wait for process, returns status. */
+
+static ptid_t
+linux_wait_1 (ptid_t ptid,
+ struct target_waitstatus *ourstatus, int target_options)
+{
+ int w;
+ struct lwp_info *event_child;
+ int options;
+ int pid;
+ int step_over_finished;
+ int bp_explains_trap;
+ int maybe_internal_trap;
+ int report_to_gdb;
+ int trace_event;
+
+ /* Translate generic target options into linux options. */
+ options = __WALL;
+ if (target_options & TARGET_WNOHANG)
+ options |= WNOHANG;
+
+retry:
+ bp_explains_trap = 0;
+ trace_event = 0;
+ ourstatus->kind = TARGET_WAITKIND_IGNORE;
+
+ /* If we were only supposed to resume one thread, only wait for
+ that thread - if it's still alive. If it died, however - which
+ can happen if we're coming from the thread death case below -
then we need to make sure we restart the other threads. We could
pick a thread at random or restart all; restarting all is less
arbitrary. */
&& !ptid_equal (cont_thread, null_ptid)
&& !ptid_equal (cont_thread, minus_one_ptid))
{
+ struct thread_info *thread;
+
thread = (struct thread_info *) find_inferior_id (&all_threads,
cont_thread);
{
if (WIFEXITED (w) || WIFSIGNALED (w))
{
- int pid = pid_of (event_child);
- struct process_info *process = find_process_pid (pid);
-
-#ifdef USE_THREAD_DB
- thread_db_free (process, 0);
-#endif
- delete_lwp (event_child);
- linux_remove_process (process);
-
- current_inferior = NULL;
-
if (WIFEXITED (w))
{
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = WEXITSTATUS (w);
if (debug_threads)
- fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+ fprintf (stderr,
+ "\nChild exited with retcode = %x \n",
+ WEXITSTATUS (w));
}
else
{
ourstatus->value.sig = target_signal_from_host (WTERMSIG (w));
if (debug_threads)
- fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+ fprintf (stderr,
+ "\nChild terminated with signal = %x \n",
+ WTERMSIG (w));
}
- return pid_to_ptid (pid);
+ return ptid_of (event_child);
}
}
else
/* Now invoke the callbacks of any internal breakpoints there. */
check_breakpoints (event_child->stop_pc);
+ /* Handle tracepoint data collecting. This may overflow the
+ trace buffer, and cause a tracing stop, removing
+ breakpoints. */
+ trace_event = handle_tracepoints (event_child);
+
if (bp_explains_trap)
{
/* If we stepped or ran into an internal breakpoint, we've
if (debug_threads)
fprintf (stderr, "Hit a gdbserver breakpoint.\n");
- event_child->need_step_over = 1;
+ if (breakpoint_here (event_child->stop_pc))
+ event_child->need_step_over = 1;
}
}
else
/* We have all the data we need. Either report the event to GDB, or
resume threads and keep waiting for more. */
- /* Check If GDB would be interested in this event. If GDB wanted
- this thread to single step, we always want to report the SIGTRAP,
- and let GDB handle it. */
+ /* If we're collecting a fast tracepoint, finish the collection and
+ move out of the jump pad before delivering a signal. See
+ linux_stabilize_threads. */
+
+ if (WIFSTOPPED (w)
+ && WSTOPSIG (w) != SIGTRAP
+ && supports_fast_tracepoints ()
+ && agent_loaded_p ())
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Got signal %d for LWP %ld. Check if we need "
+ "to defer or adjust it.\n",
+ WSTOPSIG (w), lwpid_of (event_child));
+
+ /* Allow debugging the jump pad itself. */
+ if (current_inferior->last_resume_kind != resume_step
+ && maybe_move_out_of_jump_pad (event_child, &w))
+ {
+ enqueue_one_deferred_signal (event_child, &w);
+
+ if (debug_threads)
+ fprintf (stderr,
+ "Signal %d for LWP %ld deferred (in jump pad)\n",
+ WSTOPSIG (w), lwpid_of (event_child));
+
+ linux_resume_one_lwp (event_child, 0, 0, NULL);
+ goto retry;
+ }
+ }
+
+ if (event_child->collecting_fast_tracepoint)
+ {
+ if (debug_threads)
+ fprintf (stderr, "\
+LWP %ld was trying to move out of the jump pad (%d). \
+Check if we're already there.\n",
+ lwpid_of (event_child),
+ event_child->collecting_fast_tracepoint);
+
+ trace_event = 1;
+
+ event_child->collecting_fast_tracepoint
+ = linux_fast_tracepoint_collecting (event_child, NULL);
+
+ if (event_child->collecting_fast_tracepoint != 1)
+ {
+ /* No longer need this breakpoint. */
+ if (event_child->exit_jump_pad_bkpt != NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "No longer need exit-jump-pad bkpt; removing it."
+ "stopping all threads momentarily.\n");
+
+ /* Other running threads could hit this breakpoint.
+ We don't handle moribund locations like GDB does,
+ instead we always pause all threads when removing
+ breakpoints, so that any step-over or
+ decr_pc_after_break adjustment is always taken
+ care of while the breakpoint is still
+ inserted. */
+ stop_all_lwps (1, event_child);
+ cancel_breakpoints ();
+
+ delete_breakpoint (event_child->exit_jump_pad_bkpt);
+ event_child->exit_jump_pad_bkpt = NULL;
+
+ unstop_all_lwps (1, event_child);
+
+ gdb_assert (event_child->suspended >= 0);
+ }
+ }
+
+ if (event_child->collecting_fast_tracepoint == 0)
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "fast tracepoint finished "
+ "collecting successfully.\n");
+
+ /* We may have a deferred signal to report. */
+ if (dequeue_one_deferred_signal (event_child, &w))
+ {
+ if (debug_threads)
+ fprintf (stderr, "dequeued one signal.\n");
+ }
+ else
+ {
+ if (debug_threads)
+ fprintf (stderr, "no deferred signals.\n");
+
+ if (stabilizing_threads)
+ {
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
+ ourstatus->value.sig = TARGET_SIGNAL_0;
+ return ptid_of (event_child);
+ }
+ }
+ }
+ }
+
+ /* Check whether GDB would be interested in this event. */
+
+ /* If GDB is not interested in this signal, don't stop other
+ threads, and don't report it to GDB. Just resume the inferior
+ right away. We do this for threading-related signals as well as
+ any that GDB specifically requested we ignore. But never ignore
+ SIGSTOP if we sent it ourselves, and do not ignore signals when
+ stepping - they may require special handling to skip the signal
+ handler. */
+ /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
+ thread library? */
+ if (WIFSTOPPED (w)
+ && current_inferior->last_resume_kind != resume_step
+ && (
+#if defined (USE_THREAD_DB) && !defined (__ANDROID__)
+ (current_process ()->private->thread_db != NULL
+ && (WSTOPSIG (w) == __SIGRTMIN
+ || WSTOPSIG (w) == __SIGRTMIN + 1))
+ ||
+#endif
+ (pass_signals[target_signal_from_host (WSTOPSIG (w))]
+ && !(WSTOPSIG (w) == SIGSTOP
+ && current_inferior->last_resume_kind == resume_stop))))
+ {
+ siginfo_t info, *info_p;
+
+ if (debug_threads)
+ fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
+ WSTOPSIG (w), lwpid_of (event_child));
+
+ if (ptrace (PTRACE_GETSIGINFO, lwpid_of (event_child), 0, &info) == 0)
+ info_p = &info;
+ else
+ info_p = NULL;
+ linux_resume_one_lwp (event_child, event_child->stepping,
+ WSTOPSIG (w), info_p);
+ goto retry;
+ }
+
+ /* If GDB wanted this thread to single step, we always want to
+ report the SIGTRAP, and let GDB handle it. Watchpoints should
+ always be reported. So should signals we can't explain. A
+ SIGTRAP we can't explain could be a GDB breakpoint --- we may or
+ not support Z0 breakpoints. If we do, we're be able to handle
+ GDB breakpoints on top of internal breakpoints, by handling the
+ internal breakpoint and still reporting the event to GDB. If we
+ don't, we're out of luck, GDB won't see the breakpoint hit. */
report_to_gdb = (!maybe_internal_trap
- || event_child->last_resume_kind == resume_step
+ || current_inferior->last_resume_kind == resume_step
|| event_child->stopped_by_watchpoint
- || (!step_over_finished && !bp_explains_trap));
+ || (!step_over_finished
+ && !bp_explains_trap && !trace_event)
+ || (gdb_breakpoint_here (event_child->stop_pc)
+ && gdb_condition_true_at_breakpoint (event_child->stop_pc)));
/* We found no reason GDB would want us to stop. We either hit one
of our own breakpoints, or finished an internal step GDB
fprintf (stderr, "Hit a gdbserver breakpoint.\n");
if (step_over_finished)
fprintf (stderr, "Step-over finished.\n");
+ if (trace_event)
+ fprintf (stderr, "Tracepoint event.\n");
}
/* We're not reporting this breakpoint to GDB, so apply the
(*the_low_target.set_pc) (regcache, event_child->stop_pc);
}
- /* We've finished stepping over a breakpoint. We've stopped all
- LWPs momentarily except the stepping one. This is where we
- resume them all again. We're going to keep waiting, so use
- proceed, which handles stepping over the next breakpoint. */
+ /* We may have finished stepping over a breakpoint. If so,
+ we've stopped and suspended all LWPs momentarily except the
+ stepping one. This is where we resume them all again. We're
+ going to keep waiting, so use proceed, which handles stepping
+ over the next breakpoint. */
if (debug_threads)
fprintf (stderr, "proceeding all threads.\n");
+
+ if (step_over_finished)
+ unsuspend_all_lwps (event_child);
+
proceed_all_lwps ();
goto retry;
}
if (debug_threads)
{
- if (event_child->last_resume_kind == resume_step)
+ if (current_inferior->last_resume_kind == resume_step)
fprintf (stderr, "GDB wanted to single-step, reporting event.\n");
if (event_child->stopped_by_watchpoint)
fprintf (stderr, "Stopped by watchpoint.\n");
+ if (gdb_breakpoint_here (event_child->stop_pc))
+ fprintf (stderr, "Stopped by GDB breakpoint.\n");
if (debug_threads)
fprintf (stderr, "Hit a non-gdbserver trap event.\n");
}
/* Alright, we're going to report a stop. */
- if (!non_stop)
+ if (!non_stop && !stabilizing_threads)
{
/* In all-stop, stop all threads. */
- stop_all_lwps ();
+ stop_all_lwps (0, NULL);
/* If we're not waiting for a specific LWP, choose an event LWP
from among those that have had events. Giving equal priority
See the comment in cancel_breakpoints_callback to find out
why. */
find_inferior (&all_lwps, cancel_breakpoints_callback, event_child);
+
+ /* If we were going a step-over, all other threads but the stepping one
+ had been paused in start_step_over, with their suspend counts
+ incremented. We don't want to do a full unstop/unpause, because we're
+ in all-stop mode (so we want threads stopped), but we still need to
+ unsuspend the other threads, to decrement their `suspended' count
+ back. */
+ if (step_over_finished)
+ unsuspend_all_lwps (event_child);
+
+ /* Stabilize threads (move out of jump pads). */
+ stabilize_threads ();
}
else
{
threads stopped by now anyway. In non-stop, we need to
re-resume threads that GDB wanted to be running. */
if (step_over_finished)
- unstop_all_lwps (event_child);
+ unstop_all_lwps (1, event_child);
}
ourstatus->kind = TARGET_WAITKIND_STOPPED;
- /* Do this before the gdb_wants_all_stopped calls below, since they
- always set last_resume_kind to resume_stop. */
- if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) == SIGSTOP)
+ if (current_inferior->last_resume_kind == resume_stop
+ && WSTOPSIG (w) == SIGSTOP)
{
/* A thread that has been requested to stop by GDB with vCont;t,
and it stopped cleanly, so report as SIG0. The use of
SIGSTOP is an implementation detail. */
ourstatus->value.sig = TARGET_SIGNAL_0;
}
- else if (event_child->last_resume_kind == resume_stop && WSTOPSIG (w) != SIGSTOP)
+ else if (current_inferior->last_resume_kind == resume_stop
+ && WSTOPSIG (w) != SIGSTOP)
{
/* A thread that has been requested to stop by GDB with vCont;t,
but, it stopped for other reasons. */
gdb_assert (ptid_equal (step_over_bkpt, null_ptid));
- if (!non_stop)
- {
- /* From GDB's perspective, all-stop mode always stops all
- threads implicitly. Tag all threads as "want-stopped". */
- gdb_wants_all_stopped ();
- }
- else
- {
- /* We're reporting this LWP as stopped. Update it's
- "want-stopped" state to what the client wants, until it gets
- a new resume action. */
- gdb_wants_lwp_stopped (&event_child->head);
- }
-
if (debug_threads)
fprintf (stderr, "linux_wait ret = %s, %d, %d\n",
target_pid_to_str (ptid_of (event_child)),
ourstatus->kind,
ourstatus->value.sig);
- get_lwp_thread (event_child)->last_status = *ourstatus;
return ptid_of (event_child);
}
return kill (lwpid, signo);
}
+void
+linux_stop_lwp (struct lwp_info *lwp)
+{
+ send_sigstop (lwp);
+}
+
static void
-send_sigstop (struct inferior_list_entry *entry)
+send_sigstop (struct lwp_info *lwp)
{
- struct lwp_info *lwp = (struct lwp_info *) entry;
int pid;
- if (lwp->stopped)
- return;
-
pid = lwpid_of (lwp);
/* If we already have a pending stop signal for this process, don't
kill_lwp (pid, SIGSTOP);
}
+static int
+send_sigstop_callback (struct inferior_list_entry *entry, void *except)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+
+ /* Ignore EXCEPT. */
+ if (lwp == except)
+ return 0;
+
+ if (lwp->stopped)
+ return 0;
+
+ send_sigstop (lwp);
+ return 0;
+}
+
+/* Increment the suspend count of an LWP, and stop it, if not stopped
+ yet. */
+static int
+suspend_and_send_sigstop_callback (struct inferior_list_entry *entry,
+ void *except)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+
+ /* Ignore EXCEPT. */
+ if (lwp == except)
+ return 0;
+
+ lwp->suspended++;
+
+ return send_sigstop_callback (entry, except);
+}
+
static void
mark_lwp_dead (struct lwp_info *lwp, int wstat)
{
}
}
+/* Returns true if LWP ENTRY is stopped in a jump pad, and we can't
+ move it out, because we need to report the stop event to GDB. For
+ example, if the user puts a breakpoint in the jump pad, it's
+ because she wants to debug it. */
+
+static int
+stuck_in_jump_pad_callback (struct inferior_list_entry *entry, void *data)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lwp);
+
+ gdb_assert (lwp->suspended == 0);
+ gdb_assert (lwp->stopped);
+
+ /* Allow debugging the jump pad, gdb_collect, etc.. */
+ return (supports_fast_tracepoints ()
+ && agent_loaded_p ()
+ && (gdb_breakpoint_here (lwp->stop_pc)
+ || lwp->stopped_by_watchpoint
+ || thread->last_resume_kind == resume_step)
+ && linux_fast_tracepoint_collecting (lwp, NULL));
+}
+
+static void
+move_out_of_jump_pad_callback (struct inferior_list_entry *entry)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+ struct thread_info *thread = get_lwp_thread (lwp);
+ int *wstat;
+
+ gdb_assert (lwp->suspended == 0);
+ gdb_assert (lwp->stopped);
+
+ wstat = lwp->status_pending_p ? &lwp->status_pending : NULL;
+
+ /* Allow debugging the jump pad, gdb_collect, etc. */
+ if (!gdb_breakpoint_here (lwp->stop_pc)
+ && !lwp->stopped_by_watchpoint
+ && thread->last_resume_kind != resume_step
+ && maybe_move_out_of_jump_pad (lwp, wstat))
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "LWP %ld needs stabilizing (in jump pad)\n",
+ lwpid_of (lwp));
+
+ if (wstat)
+ {
+ lwp->status_pending_p = 0;
+ enqueue_one_deferred_signal (lwp, wstat);
+
+ if (debug_threads)
+ fprintf (stderr,
+ "Signal %d for LWP %ld deferred "
+ "(in jump pad)\n",
+ WSTOPSIG (*wstat), lwpid_of (lwp));
+ }
+
+ linux_resume_one_lwp (lwp, 0, 0, NULL);
+ }
+ else
+ lwp->suspended++;
+}
+
+static int
+lwp_running (struct inferior_list_entry *entry, void *data)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+
+ if (lwp->dead)
+ return 0;
+ if (lwp->stopped)
+ return 0;
+ return 1;
+}
+
+/* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
+ If SUSPEND, then also increase the suspend count of every LWP,
+ except EXCEPT. */
+
static void
-stop_all_lwps (void)
+stop_all_lwps (int suspend, struct lwp_info *except)
{
stopping_threads = 1;
- for_each_inferior (&all_lwps, send_sigstop);
+
+ if (suspend)
+ find_inferior (&all_lwps, suspend_and_send_sigstop_callback, except);
+ else
+ find_inferior (&all_lwps, send_sigstop_callback, except);
for_each_inferior (&all_lwps, wait_for_sigstop);
stopping_threads = 0;
}
int step, int signal, siginfo_t *info)
{
struct thread_info *saved_inferior;
+ int fast_tp_collecting;
if (lwp->stopped == 0)
return;
+ fast_tp_collecting = lwp->collecting_fast_tracepoint;
+
+ gdb_assert (!stabilizing_threads || fast_tp_collecting);
+
+ /* Cancel actions that rely on GDB not changing the PC (e.g., the
+ user used the "jump" command, or "set $pc = foo"). */
+ if (lwp->stop_pc != get_pc (lwp))
+ {
+ /* Collecting 'while-stepping' actions doesn't make sense
+ anymore. */
+ release_while_stepping_state_list (get_lwp_thread (lwp));
+ }
+
/* If we have pending signals or status, and a new signal, enqueue the
signal. Also enqueue the signal if we are waiting to reinsert a
breakpoint; it will be picked up again below. */
if (signal != 0
- && (lwp->status_pending_p || lwp->pending_signals != NULL
- || lwp->bp_reinsert != 0))
+ && (lwp->status_pending_p
+ || lwp->pending_signals != NULL
+ || lwp->bp_reinsert != 0
+ || fast_tp_collecting))
{
struct pending_signals *p_sig;
p_sig = xmalloc (sizeof (*p_sig));
if (lwp->bp_reinsert != 0 && can_hardware_single_step ())
{
- if (step == 0)
- fprintf (stderr, "BAD - reinserting but not stepping.\n");
+ if (fast_tp_collecting == 0)
+ {
+ if (step == 0)
+ fprintf (stderr, "BAD - reinserting but not stepping.\n");
+ if (lwp->suspended)
+ fprintf (stderr, "BAD - reinserting and suspended(%d).\n",
+ lwp->suspended);
+ }
step = 1;
}
signal = 0;
}
+ if (fast_tp_collecting == 1)
+ {
+ if (debug_threads)
+ fprintf (stderr, "\
+lwp %ld wants to get out of fast tracepoint jump pad (exit-jump-pad-bkpt)\n",
+ lwpid_of (lwp));
+
+ /* Postpone any pending signal. It was enqueued above. */
+ signal = 0;
+ }
+ else if (fast_tp_collecting == 2)
+ {
+ if (debug_threads)
+ fprintf (stderr, "\
+lwp %ld wants to get out of fast tracepoint jump pad single-stepping\n",
+ lwpid_of (lwp));
+
+ if (can_hardware_single_step ())
+ step = 1;
+ else
+ fatal ("moving out of jump pad single-stepping"
+ " not implemented on this target");
+
+ /* Postpone any pending signal. It was enqueued above. */
+ signal = 0;
+ }
+
+ /* If we have while-stepping actions in this thread set it stepping.
+ If we have a signal to deliver, it may or may not be set to
+ SIG_IGN, we don't know. Assume so, and allow collecting
+ while-stepping into a signal handler. A possible smart thing to
+ do would be to set an internal breakpoint at the signal return
+ address, continue, and carry on catching this while-stepping
+ action only when that breakpoint is hit. A future
+ enhancement. */
+ if (get_lwp_thread (lwp)->while_stepping != NULL
+ && can_hardware_single_step ())
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "lwp %ld has a while-stepping action -> forcing step.\n",
+ lwpid_of (lwp));
+ step = 1;
+ }
+
if (debug_threads && the_low_target.get_pc != NULL)
{
struct regcache *regcache = get_thread_regcache (current_inferior, 1);
fprintf (stderr, " resuming from pc 0x%lx\n", (long) pc);
}
- /* If we have pending signals, consume one unless we are trying to reinsert
- a breakpoint. */
- if (lwp->pending_signals != NULL && lwp->bp_reinsert == 0)
+ /* If we have pending signals, consume one unless we are trying to
+ reinsert a breakpoint or we're trying to finish a fast tracepoint
+ collect. */
+ if (lwp->pending_signals != NULL
+ && lwp->bp_reinsert == 0
+ && fast_tp_collecting == 0)
{
struct pending_signals **p_sig;
&& (ptid_get_pid (ptid) == pid_of (lwp))))
{
if (r->resume[ndx].kind == resume_stop
- && lwp->last_resume_kind == resume_stop)
+ && thread->last_resume_kind == resume_stop)
{
if (debug_threads)
fprintf (stderr, "already %s LWP %ld at GDB's request\n",
}
lwp->resume = &r->resume[ndx];
- lwp->last_resume_kind = lwp->resume->kind;
+ thread->last_resume_kind = lwp->resume->kind;
+
+ /* If we had a deferred signal to report, dequeue one now.
+ This can happen if LWP gets more than one signal while
+ trying to get out of a jump pad. */
+ if (lwp->stopped
+ && !lwp->status_pending_p
+ && dequeue_one_deferred_signal (lwp, &lwp->status_pending))
+ {
+ lwp->status_pending_p = 1;
+
+ if (debug_threads)
+ fprintf (stderr,
+ "Dequeueing deferred signal %d for LWP %ld, "
+ "leaving status pending.\n",
+ WSTOPSIG (lwp->status_pending), lwpid_of (lwp));
+ }
+
return 0;
}
}
need_step_over_p (struct inferior_list_entry *entry, void *dummy)
{
struct lwp_info *lwp = (struct lwp_info *) entry;
+ struct thread_info *thread;
struct thread_info *saved_inferior;
CORE_ADDR pc;
return 0;
}
- if (lwp->last_resume_kind == resume_stop)
+ thread = get_lwp_thread (lwp);
+
+ if (thread->last_resume_kind == resume_stop)
{
if (debug_threads)
fprintf (stderr,
return 0;
}
+ gdb_assert (lwp->suspended >= 0);
+
+ if (lwp->suspended)
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Need step over [LWP %ld]? Ignoring, suspended\n",
+ lwpid_of (lwp));
+ return 0;
+ }
+
if (!lwp->need_step_over)
{
if (debug_threads)
}
saved_inferior = current_inferior;
- current_inferior = get_lwp_thread (lwp);
+ current_inferior = thread;
- /* We only step over our breakpoints. */
- if (breakpoint_here (pc))
+ /* We can only step over breakpoints we know about. */
+ if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc))
{
- if (debug_threads)
- fprintf (stderr,
- "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n",
- lwpid_of (lwp), paddress (pc));
+ /* Don't step over a breakpoint that GDB expects to hit
+ though. If the condition is being evaluated on the target's side
+ and it evaluate to false, step over this breakpoint as well. */
+ if (gdb_breakpoint_here (pc)
+ && gdb_condition_true_at_breakpoint (pc))
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Need step over [LWP %ld]? yes, but found"
+ " GDB breakpoint at 0x%s; skipping step over\n",
+ lwpid_of (lwp), paddress (pc));
- /* We've found an lwp that needs stepping over --- return 1 so
- that find_inferior stops looking. */
- current_inferior = saved_inferior;
+ current_inferior = saved_inferior;
+ return 0;
+ }
+ else
+ {
+ if (debug_threads)
+ fprintf (stderr,
+ "Need step over [LWP %ld]? yes, "
+ "found breakpoint at 0x%s\n",
+ lwpid_of (lwp), paddress (pc));
- /* If the step over is cancelled, this is set again. */
- lwp->need_step_over = 0;
- return 1;
- }
+ /* We've found an lwp that needs stepping over --- return 1 so
+ that find_inferior stops looking. */
+ current_inferior = saved_inferior;
+
+ /* If the step over is cancelled, this is set again. */
+ lwp->need_step_over = 0;
+ return 1;
+ }
+ }
current_inferior = saved_inferior;
"Starting step-over on LWP %ld. Stopping all threads\n",
lwpid_of (lwp));
- stop_all_lwps ();
+ stop_all_lwps (1, lwp);
+ gdb_assert (lwp->suspended == 0);
if (debug_threads)
fprintf (stderr, "Done stopping all threads for step-over.\n");
lwp->bp_reinsert = pc;
uninsert_breakpoints_at (pc);
+ uninsert_fast_tracepoint_jumps_at (pc);
if (can_hardware_single_step ())
{
/* Reinsert any breakpoint at LWP->BP_REINSERT. Note that there
may be no breakpoint to reinsert there by now. */
reinsert_breakpoints_at (lwp->bp_reinsert);
+ reinsert_fast_tracepoint_jumps_at (lwp->bp_reinsert);
lwp->bp_reinsert = 0;
/* Stop the thread, and wait for the event asynchronously,
through the event loop. */
- send_sigstop (&lwp->head);
+ send_sigstop (lwp);
}
else
{
the thread already has a pending status to report, we
will still report it the next time we wait - see
status_pending_p_callback. */
- send_sigstop (&lwp->head);
+
+ /* If we already have a pending signal to report, then
+ there's no need to queue a SIGSTOP, as this means we're
+ midway through moving the LWP out of the jumppad, and we
+ will report the pending signal as soon as that is
+ finished. */
+ if (lwp->pending_signals_to_report == NULL)
+ send_sigstop (lwp);
}
/* For stop requests, we're done. */
lwp->resume = NULL;
- get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE;
+ thread->last_status.kind = TARGET_WAITKIND_IGNORE;
return 0;
}
step = (lwp->resume->kind == resume_step);
linux_resume_one_lwp (lwp, step, lwp->resume->sig, NULL);
- get_lwp_thread (lwp)->last_status.kind = TARGET_WAITKIND_IGNORE;
}
else
{
}
}
+ thread->last_status.kind = TARGET_WAITKIND_IGNORE;
lwp->resume = NULL;
return 0;
}
breakpoint that needs stepping over, we start a step-over operation
on that particular thread, and leave all others stopped. */
-static void
-proceed_one_lwp (struct inferior_list_entry *entry)
+static int
+proceed_one_lwp (struct inferior_list_entry *entry, void *except)
{
- struct lwp_info *lwp;
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+ struct thread_info *thread;
int step;
- lwp = (struct lwp_info *) entry;
+ if (lwp == except)
+ return 0;
if (debug_threads)
fprintf (stderr,
{
if (debug_threads)
fprintf (stderr, " LWP %ld already running\n", lwpid_of (lwp));
- return;
+ return 0;
}
- if (lwp->last_resume_kind == resume_stop)
+ thread = get_lwp_thread (lwp);
+
+ if (thread->last_resume_kind == resume_stop
+ && thread->last_status.kind != TARGET_WAITKIND_IGNORE)
{
if (debug_threads)
- fprintf (stderr, " client wants LWP %ld stopped\n", lwpid_of (lwp));
- return;
+ fprintf (stderr, " client wants LWP to remain %ld stopped\n",
+ lwpid_of (lwp));
+ return 0;
}
if (lwp->status_pending_p)
if (debug_threads)
fprintf (stderr, " LWP %ld has pending status, leaving stopped\n",
lwpid_of (lwp));
- return;
+ return 0;
}
+ gdb_assert (lwp->suspended >= 0);
+
if (lwp->suspended)
{
if (debug_threads)
fprintf (stderr, " LWP %ld is suspended\n", lwpid_of (lwp));
- return;
+ return 0;
+ }
+
+ if (thread->last_resume_kind == resume_stop
+ && lwp->pending_signals_to_report == NULL
+ && lwp->collecting_fast_tracepoint == 0)
+ {
+ /* We haven't reported this LWP as stopped yet (otherwise, the
+ last_status.kind check above would catch it, and we wouldn't
+ reach here. This LWP may have been momentarily paused by a
+ stop_all_lwps call while handling for example, another LWP's
+ step-over. In that case, the pending expected SIGSTOP signal
+ that was queued at vCont;t handling time will have already
+ been consumed by wait_for_sigstop, and so we need to requeue
+ another one here. Note that if the LWP already has a SIGSTOP
+ pending, this is a no-op. */
+
+ if (debug_threads)
+ fprintf (stderr,
+ "Client wants LWP %ld to stop. "
+ "Making sure it has a SIGSTOP pending\n",
+ lwpid_of (lwp));
+
+ send_sigstop (lwp);
}
- step = lwp->last_resume_kind == resume_step;
+ step = thread->last_resume_kind == resume_step;
linux_resume_one_lwp (lwp, step, 0, NULL);
+ return 0;
+}
+
+static int
+unsuspend_and_proceed_one_lwp (struct inferior_list_entry *entry, void *except)
+{
+ struct lwp_info *lwp = (struct lwp_info *) entry;
+
+ if (lwp == except)
+ return 0;
+
+ lwp->suspended--;
+ gdb_assert (lwp->suspended >= 0);
+
+ return proceed_one_lwp (entry, except);
}
/* When we finish a step-over, set threads running again. If there's
if (debug_threads)
fprintf (stderr, "Proceeding, no step-over needed\n");
- for_each_inferior (&all_lwps, proceed_one_lwp);
+ find_inferior (&all_lwps, proceed_one_lwp, NULL);
}
/* Stopped LWPs that the client wanted to be running, that don't have
NULL. This undoes a stop_all_lwps call. */
static void
-unstop_all_lwps (struct lwp_info *except)
+unstop_all_lwps (int unsuspend, struct lwp_info *except)
{
if (debug_threads)
{
"unstopping all lwps\n");
}
- /* Make sure proceed_one_lwp doesn't try to resume this thread. */
- if (except != NULL)
- ++except->suspended;
-
- for_each_inferior (&all_lwps, proceed_one_lwp);
-
- if (except != NULL)
- --except->suspended;
-}
-
-#ifdef HAVE_LINUX_USRREGS
-
-int
-register_addr (int regnum)
-{
- int addr;
-
- if (regnum < 0 || regnum >= the_low_target.num_regs)
- error ("Invalid register number %d.", regnum);
-
- addr = the_low_target.regmap[regnum];
-
- return addr;
-}
-
-/* Fetch one register. */
-static void
-fetch_register (struct regcache *regcache, int regno)
-{
- CORE_ADDR regaddr;
- int i, size;
- char *buf;
- int pid;
-
- if (regno >= the_low_target.num_regs)
- return;
- if ((*the_low_target.cannot_fetch_register) (regno))
- return;
-
- regaddr = register_addr (regno);
- if (regaddr == -1)
- return;
-
- pid = lwpid_of (get_thread_lwp (current_inferior));
- size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
- & - sizeof (PTRACE_XFER_TYPE));
- buf = alloca (size);
- for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- *(PTRACE_XFER_TYPE *) (buf + i) =
- ptrace (PTRACE_PEEKUSER, pid,
- /* Coerce to a uintptr_t first to avoid potential gcc warning
- of coercing an 8 byte integer to a 4 byte pointer. */
- (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0);
- regaddr += sizeof (PTRACE_XFER_TYPE);
- if (errno != 0)
- error ("reading register %d: %s", regno, strerror (errno));
- }
-
- if (the_low_target.supply_ptrace_register)
- the_low_target.supply_ptrace_register (regcache, regno, buf);
- else
- supply_register (regcache, regno, buf);
-}
-
-/* Fetch all registers, or just one, from the child process. */
-static void
-usr_fetch_inferior_registers (struct regcache *regcache, int regno)
-{
- if (regno == -1)
- for (regno = 0; regno < the_low_target.num_regs; regno++)
- fetch_register (regcache, regno);
- else
- fetch_register (regcache, regno);
-}
-
-/* Store our register values back into the inferior.
- If REGNO is -1, do this for all registers.
- Otherwise, REGNO specifies which register (so we can save time). */
-static void
-usr_store_inferior_registers (struct regcache *regcache, int regno)
-{
- CORE_ADDR regaddr;
- int i, size;
- char *buf;
- int pid;
-
- if (regno >= 0)
- {
- if (regno >= the_low_target.num_regs)
- return;
-
- if ((*the_low_target.cannot_store_register) (regno) == 1)
- return;
-
- regaddr = register_addr (regno);
- if (regaddr == -1)
- return;
- errno = 0;
- size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
- & - sizeof (PTRACE_XFER_TYPE);
- buf = alloca (size);
- memset (buf, 0, size);
-
- if (the_low_target.collect_ptrace_register)
- the_low_target.collect_ptrace_register (regcache, regno, buf);
- else
- collect_register (regcache, regno, buf);
-
- pid = lwpid_of (get_thread_lwp (current_inferior));
- for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- ptrace (PTRACE_POKEUSER, pid,
- /* Coerce to a uintptr_t first to avoid potential gcc warning
- about coercing an 8 byte integer to a 4 byte pointer. */
- (PTRACE_ARG3_TYPE) (uintptr_t) regaddr,
- (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i));
- if (errno != 0)
- {
- /* At this point, ESRCH should mean the process is
- already gone, in which case we simply ignore attempts
- to change its registers. See also the related
- comment in linux_resume_one_lwp. */
- if (errno == ESRCH)
- return;
-
- if ((*the_low_target.cannot_store_register) (regno) == 0)
- error ("writing register %d: %s", regno, strerror (errno));
- }
- regaddr += sizeof (PTRACE_XFER_TYPE);
- }
- }
+ if (unsuspend)
+ find_inferior (&all_lwps, unsuspend_and_proceed_one_lwp, except);
else
- for (regno = 0; regno < the_low_target.num_regs; regno++)
- usr_store_inferior_registers (regcache, regno);
+ find_inferior (&all_lwps, proceed_one_lwp, except);
}
-#endif /* HAVE_LINUX_USRREGS */
-
#ifdef HAVE_LINUX_REGSETS
+#define use_linux_regsets 1
+
static int
regsets_fetch_inferior_registers (struct regcache *regcache)
{
struct regset_info *regset;
int saw_general_regs = 0;
int pid;
+ struct iovec iov;
regset = target_regsets;
pid = lwpid_of (get_thread_lwp (current_inferior));
while (regset->size >= 0)
{
- void *buf;
- int res;
+ void *buf, *data;
+ int nt_type, res;
if (regset->size == 0 || disabled_regsets[regset - target_regsets])
{
}
buf = xmalloc (regset->size);
+
+ nt_type = regset->nt_type;
+ if (nt_type)
+ {
+ iov.iov_base = buf;
+ iov.iov_len = regset->size;
+ data = (void *) &iov;
+ }
+ else
+ data = buf;
+
#ifndef __sparc__
- res = ptrace (regset->get_request, pid, 0, buf);
+ res = ptrace (regset->get_request, pid, nt_type, data);
#else
- res = ptrace (regset->get_request, pid, buf, 0);
+ res = ptrace (regset->get_request, pid, data, nt_type);
#endif
if (res < 0)
{
struct regset_info *regset;
int saw_general_regs = 0;
int pid;
+ struct iovec iov;
regset = target_regsets;
pid = lwpid_of (get_thread_lwp (current_inferior));
while (regset->size >= 0)
{
- void *buf;
- int res;
+ void *buf, *data;
+ int nt_type, res;
if (regset->size == 0 || disabled_regsets[regset - target_regsets])
{
/* First fill the buffer with the current register set contents,
in case there are any items in the kernel's regset that are
not in gdbserver's regcache. */
+
+ nt_type = regset->nt_type;
+ if (nt_type)
+ {
+ iov.iov_base = buf;
+ iov.iov_len = regset->size;
+ data = (void *) &iov;
+ }
+ else
+ data = buf;
+
#ifndef __sparc__
- res = ptrace (regset->get_request, pid, 0, buf);
+ res = ptrace (regset->get_request, pid, nt_type, data);
#else
- res = ptrace (regset->get_request, pid, buf, 0);
+ res = ptrace (regset->get_request, pid, &iov, data);
#endif
if (res == 0)
/* Only now do we write the register set. */
#ifndef __sparc__
- res = ptrace (regset->set_request, pid, 0, buf);
+ res = ptrace (regset->set_request, pid, nt_type, data);
#else
- res = ptrace (regset->set_request, pid, buf, 0);
+ res = ptrace (regset->set_request, pid, data, nt_type);
#endif
}
return 0;
else
return 1;
- return 0;
}
-#endif /* HAVE_LINUX_REGSETS */
-
+#else /* !HAVE_LINUX_REGSETS */
-void
-linux_fetch_registers (struct regcache *regcache, int regno)
-{
-#ifdef HAVE_LINUX_REGSETS
- if (regsets_fetch_inferior_registers (regcache) == 0)
- return;
-#endif
-#ifdef HAVE_LINUX_USRREGS
- usr_fetch_inferior_registers (regcache, regno);
-#endif
-}
+#define use_linux_regsets 0
+#define regsets_fetch_inferior_registers(regcache) 1
+#define regsets_store_inferior_registers(regcache) 1
-void
-linux_store_registers (struct regcache *regcache, int regno)
-{
-#ifdef HAVE_LINUX_REGSETS
- if (regsets_store_inferior_registers (regcache) == 0)
- return;
#endif
-#ifdef HAVE_LINUX_USRREGS
- usr_store_inferior_registers (regcache, regno);
-#endif
-}
-
-/* Copy LEN bytes from inferior's memory starting at MEMADDR
- to debugger memory starting at MYADDR. */
+/* Return 1 if register REGNO is supported by one of the regset ptrace
+ calls or 0 if it has to be transferred individually. */
static int
-linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
+linux_register_in_regsets (int regno)
{
- register int i;
- /* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
- /* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
- / sizeof (PTRACE_XFER_TYPE);
- /* Allocate buffer of that many longwords. */
- register PTRACE_XFER_TYPE *buffer
- = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
- int fd;
- char filename[64];
- int pid = lwpid_of (get_thread_lwp (current_inferior));
+ unsigned char mask = 1 << (regno % 8);
+ size_t index = regno / 8;
- /* Try using /proc. Don't bother for one word. */
- if (len >= 3 * sizeof (long))
- {
- /* We could keep this file open and cache it - possibly one per
- thread. That requires some juggling, but is even faster. */
- sprintf (filename, "/proc/%d/mem", pid);
- fd = open (filename, O_RDONLY | O_LARGEFILE);
- if (fd == -1)
- goto no_proc;
+ return (use_linux_regsets
+ && (the_low_target.regset_bitmap == NULL
+ || (the_low_target.regset_bitmap[index] & mask) != 0));
+}
- /* If pread64 is available, use it. It's faster if the kernel
- supports it (only one syscall), and it's 64-bit safe even on
- 32-bit platforms (for instance, SPARC debugging a SPARC64
- application). */
-#ifdef HAVE_PREAD64
- if (pread64 (fd, myaddr, len, memaddr) != len)
-#else
- if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len)
-#endif
- {
- close (fd);
- goto no_proc;
- }
+#ifdef HAVE_LINUX_USRREGS
- close (fd);
- return 0;
- }
+int
+register_addr (int regnum)
+{
+ int addr;
- no_proc:
- /* Read all the longwords */
- for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
- {
- errno = 0;
- /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
- about coercing an 8 byte integer to a 4 byte pointer. */
- buffer[i] = ptrace (PTRACE_PEEKTEXT, pid,
- (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0);
- if (errno)
- return errno;
- }
+ if (regnum < 0 || regnum >= the_low_target.num_regs)
+ error ("Invalid register number %d.", regnum);
- /* Copy appropriate bytes out of the buffer. */
- memcpy (myaddr,
- (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- len);
+ addr = the_low_target.regmap[regnum];
- return 0;
+ return addr;
}
-/* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
- memory at MEMADDR. On failure (cannot write to the inferior)
- returns the value of errno. */
-
-static int
-linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
+/* Fetch one register. */
+static void
+fetch_register (struct regcache *regcache, int regno)
{
- register int i;
- /* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
- /* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
- /* Allocate buffer of that many longwords. */
- register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
- int pid = lwpid_of (get_thread_lwp (current_inferior));
+ CORE_ADDR regaddr;
+ int i, size;
+ char *buf;
+ int pid;
+
+ if (regno >= the_low_target.num_regs)
+ return;
+ if ((*the_low_target.cannot_fetch_register) (regno))
+ return;
+
+ regaddr = register_addr (regno);
+ if (regaddr == -1)
+ return;
+
+ size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
+ & -sizeof (PTRACE_XFER_TYPE));
+ buf = alloca (size);
+
+ pid = lwpid_of (get_thread_lwp (current_inferior));
+ for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ *(PTRACE_XFER_TYPE *) (buf + i) =
+ ptrace (PTRACE_PEEKUSER, pid,
+ /* Coerce to a uintptr_t first to avoid potential gcc warning
+ of coercing an 8 byte integer to a 4 byte pointer. */
+ (PTRACE_ARG3_TYPE) (uintptr_t) regaddr, 0);
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ if (errno != 0)
+ error ("reading register %d: %s", regno, strerror (errno));
+ }
+
+ if (the_low_target.supply_ptrace_register)
+ the_low_target.supply_ptrace_register (regcache, regno, buf);
+ else
+ supply_register (regcache, regno, buf);
+}
+
+/* Store one register. */
+static void
+store_register (struct regcache *regcache, int regno)
+{
+ CORE_ADDR regaddr;
+ int i, size;
+ char *buf;
+ int pid;
+
+ if (regno >= the_low_target.num_regs)
+ return;
+ if ((*the_low_target.cannot_store_register) (regno))
+ return;
+
+ regaddr = register_addr (regno);
+ if (regaddr == -1)
+ return;
+
+ size = ((register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
+ & -sizeof (PTRACE_XFER_TYPE));
+ buf = alloca (size);
+ memset (buf, 0, size);
+
+ if (the_low_target.collect_ptrace_register)
+ the_low_target.collect_ptrace_register (regcache, regno, buf);
+ else
+ collect_register (regcache, regno, buf);
+
+ pid = lwpid_of (get_thread_lwp (current_inferior));
+ for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ ptrace (PTRACE_POKEUSER, pid,
+ /* Coerce to a uintptr_t first to avoid potential gcc warning
+ about coercing an 8 byte integer to a 4 byte pointer. */
+ (PTRACE_ARG3_TYPE) (uintptr_t) regaddr,
+ (PTRACE_ARG4_TYPE) *(PTRACE_XFER_TYPE *) (buf + i));
+ if (errno != 0)
+ {
+ /* At this point, ESRCH should mean the process is
+ already gone, in which case we simply ignore attempts
+ to change its registers. See also the related
+ comment in linux_resume_one_lwp. */
+ if (errno == ESRCH)
+ return;
+
+ if ((*the_low_target.cannot_store_register) (regno) == 0)
+ error ("writing register %d: %s", regno, strerror (errno));
+ }
+ regaddr += sizeof (PTRACE_XFER_TYPE);
+ }
+}
+
+/* Fetch all registers, or just one, from the child process.
+ If REGNO is -1, do this for all registers, skipping any that are
+ assumed to have been retrieved by regsets_fetch_inferior_registers,
+ unless ALL is non-zero.
+ Otherwise, REGNO specifies which register (so we can save time). */
+static void
+usr_fetch_inferior_registers (struct regcache *regcache, int regno, int all)
+{
+ if (regno == -1)
+ {
+ for (regno = 0; regno < the_low_target.num_regs; regno++)
+ if (all || !linux_register_in_regsets (regno))
+ fetch_register (regcache, regno);
+ }
+ else
+ fetch_register (regcache, regno);
+}
+
+/* Store our register values back into the inferior.
+ If REGNO is -1, do this for all registers, skipping any that are
+ assumed to have been saved by regsets_store_inferior_registers,
+ unless ALL is non-zero.
+ Otherwise, REGNO specifies which register (so we can save time). */
+static void
+usr_store_inferior_registers (struct regcache *regcache, int regno, int all)
+{
+ if (regno == -1)
+ {
+ for (regno = 0; regno < the_low_target.num_regs; regno++)
+ if (all || !linux_register_in_regsets (regno))
+ store_register (regcache, regno);
+ }
+ else
+ store_register (regcache, regno);
+}
+
+#else /* !HAVE_LINUX_USRREGS */
+
+#define usr_fetch_inferior_registers(regcache, regno, all) do {} while (0)
+#define usr_store_inferior_registers(regcache, regno, all) do {} while (0)
+
+#endif
+
+
+void
+linux_fetch_registers (struct regcache *regcache, int regno)
+{
+ int use_regsets;
+ int all = 0;
+
+ if (regno == -1)
+ {
+ all = regsets_fetch_inferior_registers (regcache);
+ usr_fetch_inferior_registers (regcache, regno, all);
+ }
+ else
+ {
+ use_regsets = linux_register_in_regsets (regno);
+ if (use_regsets)
+ all = regsets_fetch_inferior_registers (regcache);
+ if (!use_regsets || all)
+ usr_fetch_inferior_registers (regcache, regno, 1);
+ }
+}
+
+void
+linux_store_registers (struct regcache *regcache, int regno)
+{
+ int use_regsets;
+ int all = 0;
+
+ if (regno == -1)
+ {
+ all = regsets_store_inferior_registers (regcache);
+ usr_store_inferior_registers (regcache, regno, all);
+ }
+ else
+ {
+ use_regsets = linux_register_in_regsets (regno);
+ if (use_regsets)
+ all = regsets_store_inferior_registers (regcache);
+ if (!use_regsets || all)
+ usr_store_inferior_registers (regcache, regno, 1);
+ }
+}
+
+
+/* Copy LEN bytes from inferior's memory starting at MEMADDR
+ to debugger memory starting at MYADDR. */
+
+static int
+linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+ / sizeof (PTRACE_XFER_TYPE);
+ /* Allocate buffer of that many longwords. */
+ register PTRACE_XFER_TYPE *buffer
+ = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+ int fd;
+ char filename[64];
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
+
+ /* Try using /proc. Don't bother for one word. */
+ if (len >= 3 * sizeof (long))
+ {
+ /* We could keep this file open and cache it - possibly one per
+ thread. That requires some juggling, but is even faster. */
+ sprintf (filename, "/proc/%d/mem", pid);
+ fd = open (filename, O_RDONLY | O_LARGEFILE);
+ if (fd == -1)
+ goto no_proc;
+
+ /* If pread64 is available, use it. It's faster if the kernel
+ supports it (only one syscall), and it's 64-bit safe even on
+ 32-bit platforms (for instance, SPARC debugging a SPARC64
+ application). */
+#ifdef HAVE_PREAD64
+ if (pread64 (fd, myaddr, len, memaddr) != len)
+#else
+ if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, myaddr, len) != len)
+#endif
+ {
+ close (fd);
+ goto no_proc;
+ }
+
+ close (fd);
+ return 0;
+ }
+
+ no_proc:
+ /* Read all the longwords */
+ for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+ {
+ errno = 0;
+ /* Coerce the 3rd arg to a uintptr_t first to avoid potential gcc warning
+ about coercing an 8 byte integer to a 4 byte pointer. */
+ buffer[i] = ptrace (PTRACE_PEEKTEXT, pid,
+ (PTRACE_ARG3_TYPE) (uintptr_t) addr, 0);
+ if (errno)
+ return errno;
+ }
+
+ /* Copy appropriate bytes out of the buffer. */
+ memcpy (myaddr,
+ (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+ len);
+
+ return 0;
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR to inferior's
+ memory at MEMADDR. On failure (cannot write to the inferior)
+ returns the value of errno. */
+
+static int
+linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
+{
+ register int i;
+ /* Round starting address down to longword boundary. */
+ register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+ /* Round ending address up; get number of longwords that makes. */
+ register int count
+ = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+ / sizeof (PTRACE_XFER_TYPE);
+
+ /* Allocate buffer of that many longwords. */
+ register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *)
+ alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
if (debug_threads)
{
/* Copy data to be written over corresponding part of buffer. */
- memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
+ memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+ myaddr, len);
/* Write the entire buffer. */
/* Non-zero if the kernel supports PTRACE_O_TRACEFORK. */
static int linux_supports_tracefork_flag;
+static void
+linux_enable_event_reporting (int pid)
+{
+ if (!linux_supports_tracefork_flag)
+ return;
+
+ ptrace (PTRACE_SETOPTIONS, pid, 0, (PTRACE_ARG4_TYPE) PTRACE_O_TRACECLONE);
+}
+
/* Helper functions for linux_test_for_tracefork, called via clone (). */
static int
__clone2 (linux_tracefork_grandchild, arg, STACK_SIZE,
CLONE_VM | SIGCHLD, NULL);
#else
- clone (linux_tracefork_grandchild, arg + STACK_SIZE,
+ clone (linux_tracefork_grandchild, (char *) arg + STACK_SIZE,
CLONE_VM | SIGCHLD, NULL);
#endif
int fd, n;
int pid = lwpid_of (get_thread_lwp (current_inferior));
- snprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
+ xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
fd = open (filename, O_RDONLY);
if (fd < 0)
#define PT_TEXT_ADDR 49*4
#define PT_DATA_ADDR 50*4
#define PT_TEXT_END_ADDR 51*4
+#elif defined(BFIN)
+#define PT_TEXT_ADDR 220
+#define PT_TEXT_END_ADDR 224
+#define PT_DATA_ADDR 228
+#elif defined(__TMS320C6X__)
+#define PT_TEXT_ADDR (0x10000*4)
+#define PT_DATA_ADDR (0x10004*4)
+#define PT_TEXT_END_ADDR (0x10008*4)
#endif
/* Under uClinux, programs are loaded at non-zero offsets, which we need
#endif
static int
-compare_ints (const void *xa, const void *xb)
+linux_qxfer_osdata (const char *annex,
+ unsigned char *readbuf, unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
{
- int a = *(const int *)xa;
- int b = *(const int *)xb;
-
- return a - b;
+ return linux_common_xfer_osdata (annex, readbuf, offset, len);
}
-static int *
-unique (int *b, int *e)
-{
- int *d = b;
- while (++b != e)
- if (*d != *b)
- *++d = *b;
- return ++d;
-}
+/* Convert a native/host siginfo object, into/from the siginfo in the
+ layout of the inferiors' architecture. */
-/* Given PID, iterates over all threads in that process.
+static void
+siginfo_fixup (siginfo_t *siginfo, void *inf_siginfo, int direction)
+{
+ int done = 0;
- Information about each thread, in a format suitable for qXfer:osdata:thread
- is printed to BUFFER, if it's not NULL. BUFFER is assumed to be already
- initialized, and the caller is responsible for finishing and appending '\0'
- to it.
+ if (the_low_target.siginfo_fixup != NULL)
+ done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction);
- The list of cores that threads are running on is assigned to *CORES, if it
- is not NULL. If no cores are found, *CORES will be set to NULL. Caller
- should free *CORES. */
+ /* If there was no callback, or the callback didn't do anything,
+ then just do a straight memcpy. */
+ if (!done)
+ {
+ if (direction == 1)
+ memcpy (siginfo, inf_siginfo, sizeof (siginfo_t));
+ else
+ memcpy (inf_siginfo, siginfo, sizeof (siginfo_t));
+ }
+}
-static void
-list_threads (int pid, struct buffer *buffer, char **cores)
+static int
+linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
+ unsigned const char *writebuf, CORE_ADDR offset, int len)
{
- int count = 0;
- int allocated = 10;
- int *core_numbers = xmalloc (sizeof (int) * allocated);
- char pathname[128];
- DIR *dir;
- struct dirent *dp;
- struct stat statbuf;
+ int pid;
+ siginfo_t siginfo;
+ char inf_siginfo[sizeof (siginfo_t)];
- sprintf (pathname, "/proc/%d/task", pid);
- if (stat (pathname, &statbuf) == 0 && S_ISDIR (statbuf.st_mode))
- {
- dir = opendir (pathname);
- if (!dir)
- {
- free (core_numbers);
- return;
- }
+ if (current_inferior == NULL)
+ return -1;
- while ((dp = readdir (dir)) != NULL)
- {
- unsigned long lwp = strtoul (dp->d_name, NULL, 10);
+ pid = lwpid_of (get_thread_lwp (current_inferior));
- if (lwp != 0)
- {
- unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0));
+ if (debug_threads)
+ fprintf (stderr, "%s siginfo for lwp %d.\n",
+ readbuf != NULL ? "Reading" : "Writing",
+ pid);
- if (core != -1)
- {
- char s[sizeof ("4294967295")];
- sprintf (s, "%u", core);
-
- if (count == allocated)
- {
- allocated *= 2;
- core_numbers = realloc (core_numbers,
- sizeof (int) * allocated);
- }
- core_numbers[count++] = core;
- if (buffer)
- buffer_xml_printf (buffer,
- "<item>"
- "<column name=\"pid\">%d</column>"
- "<column name=\"tid\">%s</column>"
- "<column name=\"core\">%s</column>"
- "</item>", pid, dp->d_name, s);
- }
- else
- {
- if (buffer)
- buffer_xml_printf (buffer,
- "<item>"
- "<column name=\"pid\">%d</column>"
- "<column name=\"tid\">%s</column>"
- "</item>", pid, dp->d_name);
- }
- }
- }
- }
-
- if (cores)
- {
- *cores = NULL;
- if (count > 0)
- {
- struct buffer buffer2;
- int *b;
- int *e;
- qsort (core_numbers, count, sizeof (int), compare_ints);
-
- /* Remove duplicates. */
- b = core_numbers;
- e = unique (b, core_numbers + count);
-
- buffer_init (&buffer2);
-
- for (b = core_numbers; b != e; ++b)
- {
- char number[sizeof ("4294967295")];
- sprintf (number, "%u", *b);
- buffer_xml_printf (&buffer2, "%s%s",
- (b == core_numbers) ? "" : ",", number);
- }
- buffer_grow_str0 (&buffer2, "");
-
- *cores = buffer_finish (&buffer2);
- }
- }
- free (core_numbers);
-}
-
-static void
-show_process (int pid, const char *username, struct buffer *buffer)
-{
- char pathname[128];
- FILE *f;
- char cmd[MAXPATHLEN + 1];
-
- sprintf (pathname, "/proc/%d/cmdline", pid);
-
- if ((f = fopen (pathname, "r")) != NULL)
- {
- size_t len = fread (cmd, 1, sizeof (cmd) - 1, f);
- if (len > 0)
- {
- char *cores = 0;
- int i;
- for (i = 0; i < len; i++)
- if (cmd[i] == '\0')
- cmd[i] = ' ';
- cmd[len] = '\0';
-
- buffer_xml_printf (buffer,
- "<item>"
- "<column name=\"pid\">%d</column>"
- "<column name=\"user\">%s</column>"
- "<column name=\"command\">%s</column>",
- pid,
- username,
- cmd);
-
- /* This only collects core numbers, and does not print threads. */
- list_threads (pid, NULL, &cores);
-
- if (cores)
- {
- buffer_xml_printf (buffer,
- "<column name=\"cores\">%s</column>", cores);
- free (cores);
- }
-
- buffer_xml_printf (buffer, "</item>");
- }
- fclose (f);
- }
-}
-
-static int
-linux_qxfer_osdata (const char *annex,
- unsigned char *readbuf, unsigned const char *writebuf,
- CORE_ADDR offset, int len)
-{
- /* We make the process list snapshot when the object starts to be
- read. */
- static const char *buf;
- static long len_avail = -1;
- static struct buffer buffer;
- int processes = 0;
- int threads = 0;
-
- DIR *dirp;
-
- if (strcmp (annex, "processes") == 0)
- processes = 1;
- else if (strcmp (annex, "threads") == 0)
- threads = 1;
- else
- return 0;
-
- if (!readbuf || writebuf)
- return 0;
-
- if (offset == 0)
- {
- if (len_avail != -1 && len_avail != 0)
- buffer_free (&buffer);
- len_avail = 0;
- buf = NULL;
- buffer_init (&buffer);
- if (processes)
- buffer_grow_str (&buffer, "<osdata type=\"processes\">");
- else if (threads)
- buffer_grow_str (&buffer, "<osdata type=\"threads\">");
-
- dirp = opendir ("/proc");
- if (dirp)
- {
- struct dirent *dp;
- while ((dp = readdir (dirp)) != NULL)
- {
- struct stat statbuf;
- char procentry[sizeof ("/proc/4294967295")];
-
- if (!isdigit (dp->d_name[0])
- || strlen (dp->d_name) > sizeof ("4294967295") - 1)
- continue;
-
- sprintf (procentry, "/proc/%s", dp->d_name);
- if (stat (procentry, &statbuf) == 0
- && S_ISDIR (statbuf.st_mode))
- {
- int pid = (int) strtoul (dp->d_name, NULL, 10);
-
- if (processes)
- {
- struct passwd *entry = getpwuid (statbuf.st_uid);
- show_process (pid, entry ? entry->pw_name : "?", &buffer);
- }
- else if (threads)
- {
- list_threads (pid, &buffer, NULL);
- }
- }
- }
-
- closedir (dirp);
- }
- buffer_grow_str0 (&buffer, "</osdata>\n");
- buf = buffer_finish (&buffer);
- len_avail = strlen (buf);
- }
-
- if (offset >= len_avail)
- {
- /* Done. Get rid of the data. */
- buffer_free (&buffer);
- buf = NULL;
- len_avail = 0;
- return 0;
- }
-
- if (len > len_avail - offset)
- len = len_avail - offset;
- memcpy (readbuf, buf + offset, len);
-
- return len;
-}
-
-/* Convert a native/host siginfo object, into/from the siginfo in the
- layout of the inferiors' architecture. */
-
-static void
-siginfo_fixup (struct siginfo *siginfo, void *inf_siginfo, int direction)
-{
- int done = 0;
-
- if (the_low_target.siginfo_fixup != NULL)
- done = the_low_target.siginfo_fixup (siginfo, inf_siginfo, direction);
-
- /* If there was no callback, or the callback didn't do anything,
- then just do a straight memcpy. */
- if (!done)
- {
- if (direction == 1)
- memcpy (siginfo, inf_siginfo, sizeof (struct siginfo));
- else
- memcpy (inf_siginfo, siginfo, sizeof (struct siginfo));
- }
-}
-
-static int
-linux_xfer_siginfo (const char *annex, unsigned char *readbuf,
- unsigned const char *writebuf, CORE_ADDR offset, int len)
-{
- int pid;
- struct siginfo siginfo;
- char inf_siginfo[sizeof (struct siginfo)];
-
- if (current_inferior == NULL)
- return -1;
-
- pid = lwpid_of (get_thread_lwp (current_inferior));
-
- if (debug_threads)
- fprintf (stderr, "%s siginfo for lwp %d.\n",
- readbuf != NULL ? "Reading" : "Writing",
- pid);
-
- if (offset > sizeof (siginfo))
- return -1;
+ if (offset >= sizeof (siginfo))
+ return -1;
if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0)
return -1;
int old_errno = errno;
if (debug_threads)
- /* fprintf is not async-signal-safe, so call write directly. */
- write (2, "sigchld_handler\n", sizeof ("sigchld_handler\n") - 1);
+ {
+ do
+ {
+ /* fprintf is not async-signal-safe, so call write
+ directly. */
+ if (write (2, "sigchld_handler\n",
+ sizeof ("sigchld_handler\n") - 1) < 0)
+ break; /* just ignore */
+ } while (0);
+ }
if (target_is_async_p ())
async_file_mark (); /* trigger a linux_wait */
{
int previous = (linux_event_pipe[0] != -1);
+ if (debug_threads)
+ fprintf (stderr, "linux_async (%d), previous=%d\n",
+ enable, previous);
+
if (previous != enable)
{
sigset_t mask;
return 1;
}
+static int
+linux_supports_disable_randomization (void)
+{
+#ifdef HAVE_PERSONALITY
+ return 1;
+#else
+ return 0;
+#endif
+}
+
+static int
+linux_supports_agent (void)
+{
+ return 1;
+}
/* Enumerate spufs IDs for process PID. */
static int
return ret;
}
+#if defined PT_GETDSBT || defined PTRACE_GETFDPIC
+struct target_loadseg
+{
+ /* Core address to which the segment is mapped. */
+ Elf32_Addr addr;
+ /* VMA recorded in the program header. */
+ Elf32_Addr p_vaddr;
+ /* Size of this segment in memory. */
+ Elf32_Word p_memsz;
+};
+
+# if defined PT_GETDSBT
+struct target_loadmap
+{
+ /* Protocol version number, must be zero. */
+ Elf32_Word version;
+ /* Pointer to the DSBT table, its size, and the DSBT index. */
+ unsigned *dsbt_table;
+ unsigned dsbt_size, dsbt_index;
+ /* Number of segments in this map. */
+ Elf32_Word nsegs;
+ /* The actual memory map. */
+ struct target_loadseg segs[/*nsegs*/];
+};
+# define LINUX_LOADMAP PT_GETDSBT
+# define LINUX_LOADMAP_EXEC PTRACE_GETDSBT_EXEC
+# define LINUX_LOADMAP_INTERP PTRACE_GETDSBT_INTERP
+# else
+struct target_loadmap
+{
+ /* Protocol version number, must be zero. */
+ Elf32_Half version;
+ /* Number of segments in this map. */
+ Elf32_Half nsegs;
+ /* The actual memory map. */
+ struct target_loadseg segs[/*nsegs*/];
+};
+# define LINUX_LOADMAP PTRACE_GETFDPIC
+# define LINUX_LOADMAP_EXEC PTRACE_GETFDPIC_EXEC
+# define LINUX_LOADMAP_INTERP PTRACE_GETFDPIC_INTERP
+# endif
+
static int
-linux_core_of_thread (ptid_t ptid)
-{
- char filename[sizeof ("/proc//task//stat")
- + 2 * 20 /* decimal digits for 2 numbers, max 2^64 bit each */
- + 1];
- FILE *f;
- char *content = NULL;
- char *p;
- char *ts = 0;
- int content_read = 0;
- int i;
- int core;
-
- sprintf (filename, "/proc/%d/task/%ld/stat",
- ptid_get_pid (ptid), ptid_get_lwp (ptid));
- f = fopen (filename, "r");
- if (!f)
+linux_read_loadmap (const char *annex, CORE_ADDR offset,
+ unsigned char *myaddr, unsigned int len)
+{
+ int pid = lwpid_of (get_thread_lwp (current_inferior));
+ int addr = -1;
+ struct target_loadmap *data = NULL;
+ unsigned int actual_length, copy_length;
+
+ if (strcmp (annex, "exec") == 0)
+ addr = (int) LINUX_LOADMAP_EXEC;
+ else if (strcmp (annex, "interp") == 0)
+ addr = (int) LINUX_LOADMAP_INTERP;
+ else
+ return -1;
+
+ if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0)
+ return -1;
+
+ if (data == NULL)
return -1;
- for (;;)
+ actual_length = sizeof (struct target_loadmap)
+ + sizeof (struct target_loadseg) * data->nsegs;
+
+ if (offset < 0 || offset > actual_length)
+ return -1;
+
+ copy_length = actual_length - offset < len ? actual_length - offset : len;
+ memcpy (myaddr, (char *) data + offset, copy_length);
+ return copy_length;
+}
+#else
+# define linux_read_loadmap NULL
+#endif /* defined PT_GETDSBT || defined PTRACE_GETFDPIC */
+
+static void
+linux_process_qsupported (const char *query)
+{
+ if (the_low_target.process_qsupported != NULL)
+ the_low_target.process_qsupported (query);
+}
+
+static int
+linux_supports_tracepoints (void)
+{
+ if (*the_low_target.supports_tracepoints == NULL)
+ return 0;
+
+ return (*the_low_target.supports_tracepoints) ();
+}
+
+static CORE_ADDR
+linux_read_pc (struct regcache *regcache)
+{
+ if (the_low_target.get_pc == NULL)
+ return 0;
+
+ return (*the_low_target.get_pc) (regcache);
+}
+
+static void
+linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ gdb_assert (the_low_target.set_pc != NULL);
+
+ (*the_low_target.set_pc) (regcache, pc);
+}
+
+static int
+linux_thread_stopped (struct thread_info *thread)
+{
+ return get_thread_lwp (thread)->stopped;
+}
+
+/* This exposes stop-all-threads functionality to other modules. */
+
+static void
+linux_pause_all (int freeze)
+{
+ stop_all_lwps (freeze, NULL);
+}
+
+/* This exposes unstop-all-threads functionality to other gdbserver
+ modules. */
+
+static void
+linux_unpause_all (int unfreeze)
+{
+ unstop_all_lwps (unfreeze, NULL);
+}
+
+static int
+linux_prepare_to_access_memory (void)
+{
+ /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
+ running LWP. */
+ if (non_stop)
+ linux_pause_all (1);
+ return 0;
+}
+
+static void
+linux_done_accessing_memory (void)
+{
+ /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
+ running LWP. */
+ if (non_stop)
+ linux_unpause_all (1);
+}
+
+static int
+linux_install_fast_tracepoint_jump_pad (CORE_ADDR tpoint, CORE_ADDR tpaddr,
+ CORE_ADDR collector,
+ CORE_ADDR lockaddr,
+ ULONGEST orig_size,
+ CORE_ADDR *jump_entry,
+ CORE_ADDR *trampoline,
+ ULONGEST *trampoline_size,
+ unsigned char *jjump_pad_insn,
+ ULONGEST *jjump_pad_insn_size,
+ CORE_ADDR *adjusted_insn_addr,
+ CORE_ADDR *adjusted_insn_addr_end,
+ char *err)
+{
+ return (*the_low_target.install_fast_tracepoint_jump_pad)
+ (tpoint, tpaddr, collector, lockaddr, orig_size,
+ jump_entry, trampoline, trampoline_size,
+ jjump_pad_insn, jjump_pad_insn_size,
+ adjusted_insn_addr, adjusted_insn_addr_end,
+ err);
+}
+
+static struct emit_ops *
+linux_emit_ops (void)
+{
+ if (the_low_target.emit_ops != NULL)
+ return (*the_low_target.emit_ops) ();
+ else
+ return NULL;
+}
+
+static int
+linux_get_min_fast_tracepoint_insn_len (void)
+{
+ return (*the_low_target.get_min_fast_tracepoint_insn_len) ();
+}
+
+/* Extract &phdr and num_phdr in the inferior. Return 0 on success. */
+
+static int
+get_phdr_phnum_from_proc_auxv (const int pid, const int is_elf64,
+ CORE_ADDR *phdr_memaddr, int *num_phdr)
+{
+ char filename[PATH_MAX];
+ int fd;
+ const int auxv_size = is_elf64
+ ? sizeof (Elf64_auxv_t) : sizeof (Elf32_auxv_t);
+ char buf[sizeof (Elf64_auxv_t)]; /* The larger of the two. */
+
+ xsnprintf (filename, sizeof filename, "/proc/%d/auxv", pid);
+
+ fd = open (filename, O_RDONLY);
+ if (fd < 0)
+ return 1;
+
+ *phdr_memaddr = 0;
+ *num_phdr = 0;
+ while (read (fd, buf, auxv_size) == auxv_size
+ && (*phdr_memaddr == 0 || *num_phdr == 0))
+ {
+ if (is_elf64)
+ {
+ Elf64_auxv_t *const aux = (Elf64_auxv_t *) buf;
+
+ switch (aux->a_type)
+ {
+ case AT_PHDR:
+ *phdr_memaddr = aux->a_un.a_val;
+ break;
+ case AT_PHNUM:
+ *num_phdr = aux->a_un.a_val;
+ break;
+ }
+ }
+ else
+ {
+ Elf32_auxv_t *const aux = (Elf32_auxv_t *) buf;
+
+ switch (aux->a_type)
+ {
+ case AT_PHDR:
+ *phdr_memaddr = aux->a_un.a_val;
+ break;
+ case AT_PHNUM:
+ *num_phdr = aux->a_un.a_val;
+ break;
+ }
+ }
+ }
+
+ close (fd);
+
+ if (*phdr_memaddr == 0 || *num_phdr == 0)
+ {
+ warning ("Unexpected missing AT_PHDR and/or AT_PHNUM: "
+ "phdr_memaddr = %ld, phdr_num = %d",
+ (long) *phdr_memaddr, *num_phdr);
+ return 2;
+ }
+
+ return 0;
+}
+
+/* Return &_DYNAMIC (via PT_DYNAMIC) in the inferior, or 0 if not present. */
+
+static CORE_ADDR
+get_dynamic (const int pid, const int is_elf64)
+{
+ CORE_ADDR phdr_memaddr, relocation;
+ int num_phdr, i;
+ unsigned char *phdr_buf;
+ const int phdr_size = is_elf64 ? sizeof (Elf64_Phdr) : sizeof (Elf32_Phdr);
+
+ if (get_phdr_phnum_from_proc_auxv (pid, is_elf64, &phdr_memaddr, &num_phdr))
+ return 0;
+
+ gdb_assert (num_phdr < 100); /* Basic sanity check. */
+ phdr_buf = alloca (num_phdr * phdr_size);
+
+ if (linux_read_memory (phdr_memaddr, phdr_buf, num_phdr * phdr_size))
+ return 0;
+
+ /* Compute relocation: it is expected to be 0 for "regular" executables,
+ non-zero for PIE ones. */
+ relocation = -1;
+ for (i = 0; relocation == -1 && i < num_phdr; i++)
+ if (is_elf64)
+ {
+ Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size);
+
+ if (p->p_type == PT_PHDR)
+ relocation = phdr_memaddr - p->p_vaddr;
+ }
+ else
+ {
+ Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size);
+
+ if (p->p_type == PT_PHDR)
+ relocation = phdr_memaddr - p->p_vaddr;
+ }
+
+ if (relocation == -1)
+ {
+ /* PT_PHDR is optional, but necessary for PIE in general. Fortunately
+ any real world executables, including PIE executables, have always
+ PT_PHDR present. PT_PHDR is not present in some shared libraries or
+ in fpc (Free Pascal 2.4) binaries but neither of those have a need for
+ or present DT_DEBUG anyway (fpc binaries are statically linked).
+
+ Therefore if there exists DT_DEBUG there is always also PT_PHDR.
+
+ GDB could find RELOCATION also from AT_ENTRY - e_entry. */
+
+ return 0;
+ }
+
+ for (i = 0; i < num_phdr; i++)
+ {
+ if (is_elf64)
+ {
+ Elf64_Phdr *const p = (Elf64_Phdr *) (phdr_buf + i * phdr_size);
+
+ if (p->p_type == PT_DYNAMIC)
+ return p->p_vaddr + relocation;
+ }
+ else
+ {
+ Elf32_Phdr *const p = (Elf32_Phdr *) (phdr_buf + i * phdr_size);
+
+ if (p->p_type == PT_DYNAMIC)
+ return p->p_vaddr + relocation;
+ }
+ }
+
+ return 0;
+}
+
+/* Return &_r_debug in the inferior, or -1 if not present. Return value
+ can be 0 if the inferior does not yet have the library list initialized. */
+
+static CORE_ADDR
+get_r_debug (const int pid, const int is_elf64)
+{
+ CORE_ADDR dynamic_memaddr;
+ const int dyn_size = is_elf64 ? sizeof (Elf64_Dyn) : sizeof (Elf32_Dyn);
+ unsigned char buf[sizeof (Elf64_Dyn)]; /* The larger of the two. */
+
+ dynamic_memaddr = get_dynamic (pid, is_elf64);
+ if (dynamic_memaddr == 0)
+ return (CORE_ADDR) -1;
+
+ while (linux_read_memory (dynamic_memaddr, buf, dyn_size) == 0)
{
- int n;
- content = realloc (content, content_read + 1024);
- n = fread (content + content_read, 1, 1024, f);
- content_read += n;
- if (n < 1024)
+ if (is_elf64)
{
- content[content_read] = '\0';
- break;
+ Elf64_Dyn *const dyn = (Elf64_Dyn *) buf;
+
+ if (dyn->d_tag == DT_DEBUG)
+ return dyn->d_un.d_val;
+
+ if (dyn->d_tag == DT_NULL)
+ break;
+ }
+ else
+ {
+ Elf32_Dyn *const dyn = (Elf32_Dyn *) buf;
+
+ if (dyn->d_tag == DT_DEBUG)
+ return dyn->d_un.d_val;
+
+ if (dyn->d_tag == DT_NULL)
+ break;
}
+
+ dynamic_memaddr += dyn_size;
+ }
+
+ return (CORE_ADDR) -1;
+}
+
+/* Read one pointer from MEMADDR in the inferior. */
+
+static int
+read_one_ptr (CORE_ADDR memaddr, CORE_ADDR *ptr, int ptr_size)
+{
+ *ptr = 0;
+ return linux_read_memory (memaddr, (unsigned char *) ptr, ptr_size);
+}
+
+struct link_map_offsets
+ {
+ /* Offset and size of r_debug.r_version. */
+ int r_version_offset;
+
+ /* Offset and size of r_debug.r_map. */
+ int r_map_offset;
+
+ /* Offset to l_addr field in struct link_map. */
+ int l_addr_offset;
+
+ /* Offset to l_name field in struct link_map. */
+ int l_name_offset;
+
+ /* Offset to l_ld field in struct link_map. */
+ int l_ld_offset;
+
+ /* Offset to l_next field in struct link_map. */
+ int l_next_offset;
+
+ /* Offset to l_prev field in struct link_map. */
+ int l_prev_offset;
+ };
+
+/* Construct qXfer:libraries:read reply. */
+
+static int
+linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
+ unsigned const char *writebuf,
+ CORE_ADDR offset, int len)
+{
+ char *document;
+ unsigned document_len;
+ struct process_info_private *const priv = current_process ()->private;
+ char filename[PATH_MAX];
+ int pid, is_elf64;
+
+ static const struct link_map_offsets lmo_32bit_offsets =
+ {
+ 0, /* r_version offset. */
+ 4, /* r_debug.r_map offset. */
+ 0, /* l_addr offset in link_map. */
+ 4, /* l_name offset in link_map. */
+ 8, /* l_ld offset in link_map. */
+ 12, /* l_next offset in link_map. */
+ 16 /* l_prev offset in link_map. */
+ };
+
+ static const struct link_map_offsets lmo_64bit_offsets =
+ {
+ 0, /* r_version offset. */
+ 8, /* r_debug.r_map offset. */
+ 0, /* l_addr offset in link_map. */
+ 8, /* l_name offset in link_map. */
+ 16, /* l_ld offset in link_map. */
+ 24, /* l_next offset in link_map. */
+ 32 /* l_prev offset in link_map. */
+ };
+ const struct link_map_offsets *lmo;
+
+ if (writebuf != NULL)
+ return -2;
+ if (readbuf == NULL)
+ return -1;
+
+ pid = lwpid_of (get_thread_lwp (current_inferior));
+ xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid);
+ is_elf64 = elf_64_file_p (filename);
+ lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets;
+
+ if (priv->r_debug == 0)
+ priv->r_debug = get_r_debug (pid, is_elf64);
+
+ if (priv->r_debug == (CORE_ADDR) -1 || priv->r_debug == 0)
+ {
+ document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n");
}
+ else
+ {
+ int allocated = 1024;
+ char *p;
+ const int ptr_size = is_elf64 ? 8 : 4;
+ CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev;
+ int r_version, header_done = 0;
+
+ document = xmalloc (allocated);
+ strcpy (document, "<library-list-svr4 version=\"1.0\"");
+ p = document + strlen (document);
+
+ r_version = 0;
+ if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
+ (unsigned char *) &r_version,
+ sizeof (r_version)) != 0
+ || r_version != 1)
+ {
+ warning ("unexpected r_debug version %d", r_version);
+ goto done;
+ }
- p = strchr (content, '(');
- p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */
+ if (read_one_ptr (priv->r_debug + lmo->r_map_offset,
+ &lm_addr, ptr_size) != 0)
+ {
+ warning ("unable to read r_map from 0x%lx",
+ (long) priv->r_debug + lmo->r_map_offset);
+ goto done;
+ }
- p = strtok_r (p, " ", &ts);
- for (i = 0; i != 36; ++i)
- p = strtok_r (NULL, " ", &ts);
+ lm_prev = 0;
+ while (read_one_ptr (lm_addr + lmo->l_name_offset,
+ &l_name, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_addr_offset,
+ &l_addr, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_ld_offset,
+ &l_ld, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_prev_offset,
+ &l_prev, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_next_offset,
+ &l_next, ptr_size) == 0)
+ {
+ unsigned char libname[PATH_MAX];
- if (sscanf (p, "%d", &core) == 0)
- core = -1;
+ if (lm_prev != l_prev)
+ {
+ warning ("Corrupted shared library list: 0x%lx != 0x%lx",
+ (long) lm_prev, (long) l_prev);
+ break;
+ }
- free (content);
- fclose (f);
+ /* Not checking for error because reading may stop before
+ we've got PATH_MAX worth of characters. */
+ libname[0] = '\0';
+ linux_read_memory (l_name, libname, sizeof (libname) - 1);
+ libname[sizeof (libname) - 1] = '\0';
+ if (libname[0] != '\0')
+ {
+ /* 6x the size for xml_escape_text below. */
+ size_t len = 6 * strlen ((char *) libname);
+ char *name;
- return core;
+ if (!header_done)
+ {
+ /* Terminate `<library-list-svr4'. */
+ *p++ = '>';
+ header_done = 1;
+ }
+
+ while (allocated < p - document + len + 200)
+ {
+ /* Expand to guarantee sufficient storage. */
+ uintptr_t document_len = p - document;
+
+ document = xrealloc (document, 2 * allocated);
+ allocated *= 2;
+ p = document + document_len;
+ }
+
+ name = xml_escape_text ((char *) libname);
+ p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" "
+ "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
+ name, (unsigned long) lm_addr,
+ (unsigned long) l_addr, (unsigned long) l_ld);
+ free (name);
+ }
+ else if (lm_prev == 0)
+ {
+ sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr);
+ p = p + strlen (p);
+ }
+
+ if (l_next == 0)
+ break;
+
+ lm_prev = lm_addr;
+ lm_addr = l_next;
+ }
+ done:
+ strcpy (p, "</library-list-svr4>");
+ }
+
+ document_len = strlen (document);
+ if (offset < document_len)
+ document_len -= offset;
+ else
+ document_len = 0;
+ if (len > document_len)
+ len = document_len;
+
+ memcpy (readbuf, document + offset, len);
+ xfree (document);
+
+ return len;
}
static struct target_ops linux_target_ops = {
linux_attach,
linux_kill,
linux_detach,
+ linux_mourn,
linux_join,
linux_thread_alive,
linux_resume,
linux_wait,
linux_fetch_registers,
linux_store_registers,
+ linux_prepare_to_access_memory,
+ linux_done_accessing_memory,
linux_read_memory,
linux_write_memory,
linux_look_up_symbols,
#else
NULL,
#endif
- linux_core_of_thread
+ linux_common_core_of_thread,
+ linux_read_loadmap,
+ linux_process_qsupported,
+ linux_supports_tracepoints,
+ linux_read_pc,
+ linux_write_pc,
+ linux_thread_stopped,
+ NULL,
+ linux_pause_all,
+ linux_unpause_all,
+ linux_cancel_breakpoints,
+ linux_stabilize_threads,
+ linux_install_fast_tracepoint_jump_pad,
+ linux_emit_ops,
+ linux_supports_disable_randomization,
+ linux_get_min_fast_tracepoint_insn_len,
+ linux_qxfer_libraries_svr4,
+ linux_supports_agent,
};
static void
{
/* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
to find what the cancel signal actually is. */
-#ifdef __SIGRTMIN /* Bionic doesn't use SIGRTMIN the way glibc does. */
+#ifndef __ANDROID__ /* Bionic doesn't use SIGRTMIN the way glibc does. */
signal (__SIGRTMIN+1, SIG_IGN);
#endif
}