/* 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 <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>
#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
/* 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 *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 int finish_step_over (struct lwp_info *lwp);
static CORE_ADDR get_stop_pc (struct lwp_info *lwp);
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;
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)
{
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);
return pid;
}
+/* Detect `T (stopped)' in `/proc/PID/status'.
+ Other states including `T (tracing stop)' are reported as false. */
+
+static int
+pid_is_stopped (pid_t pid)
+{
+ FILE *status_file;
+ char buf[100];
+ int retval = 0;
+
+ snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid);
+ status_file = fopen (buf, "r");
+ if (status_file != NULL)
+ {
+ int have_state = 0;
+
+ while (fgets (buf, sizeof (buf), status_file))
+ {
+ if (strncmp (buf, "State:", 6) == 0)
+ {
+ have_state = 1;
+ break;
+ }
+ }
+ if (have_state && strstr (buf, "T (stopped)") != NULL)
+ retval = 1;
+ fclose (status_file);
+ }
+ return retval;
+}
+
/* Attach to an inferior process. */
static void
}
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 (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.
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)
{
+ /* Attach to PID. We will check for other threads
+ soon. */
linux_attach_lwp_1 (pid, 1);
linux_add_process (pid, 1);
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);
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;
first, as PTRACE_KILL will not work otherwise. */
stop_all_lwps (0, NULL);
- find_inferior (&all_threads, linux_kill_one_lwp, &pid);
+ 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);
- do
+ if (lwp == NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr, "lk_1: cannot find lwp %ld, for pid: %d\n",
+ lwpid_of (lwp), pid);
+ }
+ else
{
- ptrace (PTRACE_KILL, lwpid_of (lwp), 0, 0);
+ if (debug_threads)
+ fprintf (stderr, "lk_1: killing lwp %ld, for pid: %d\n",
+ lwpid_of (lwp), pid);
- /* 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));
+ do
+ {
+ linux_kill_one_lwp (lwp);
+
+ /* 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);
get_lwp_thread (lwp));
/* Finally, let it resume. */
+ if (the_low_target.prepare_to_resume != NULL)
+ the_low_target.prepare_to_resume (lwp);
ptrace (PTRACE_DETACH, lwpid_of (lwp), 0, 0);
delete_lwp (lwp);
thread_db_detach (process);
#endif
+ /* Stabilize threads (move out of jump pads). */
+ stabilize_threads ();
+
find_inferior (&all_threads, linux_detach_one_lwp, &pid);
the_target->mourn (process);
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);
/* 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)
{
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;
+
+ 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 ()
+ && in_process_agent_loaded ())
+ {
+ 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,
+ " 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;
+ }
+
+ 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,
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);
}
- /* 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. */
+ 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. */
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
}
}
-/* Set this inferior LWP's state as "want-stopped". We won't resume
- this LWP until the client gives us another action for it. */
-
-static void
-gdb_wants_lwp_stopped (struct inferior_list_entry *entry)
-{
- 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;
-
- thread->last_resume_kind = resume_stop;
-}
-
/* Decrement the suspend count of an LWP. */
static int
find_inferior (&all_lwps, unsuspend_one_lwp, except);
}
-/* Set all LWP's states as "want-stopped". */
+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 void
-gdb_wants_all_stopped (void)
+linux_stabilize_threads (void)
{
- for_each_inferior (&all_lwps, gdb_wants_lwp_stopped);
+ struct thread_info *save_inferior;
+ struct lwp_info *lwp_stuck;
+
+ 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;
+ }
+
+ save_inferior = current_inferior;
+
+ 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. */
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
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
/* We have some other signal, possibly a step-over dance was in
progress, and it should be cancelled too. */
step_over_finished = finish_step_over (event_child);
+ }
+
+ /* We have all the data we need. Either report the event to GDB, or
+ resume threads and keep waiting for more. */
+
+ /* 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 ()
+ && in_process_agent_loaded ())
+ {
+ 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);
+ }
+ }
- trace_event = 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 (WIFSTOPPED (w)
&& current_inferior->last_resume_kind != resume_step
&& (
-#if defined (USE_THREAD_DB) && defined (__SIGRTMIN)
+#if defined (USE_THREAD_DB) && !defined (__ANDROID__)
(current_process ()->private->thread_db != NULL
&& (WSTOPSIG (w) == __SIGRTMIN
|| WSTOPSIG (w) == __SIGRTMIN + 1))
report_to_gdb = (!maybe_internal_trap
|| current_inferior->last_resume_kind == resume_step
|| event_child->stopped_by_watchpoint
- || (!step_over_finished && !bp_explains_trap && !trace_event)
- || gdb_breakpoint_here (event_child->stop_pc));
+ || (!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
/* 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 (0, NULL);
See the comment in cancel_breakpoints_callback to find out
why. */
find_inferior (&all_lwps, cancel_breakpoints_callback, event_child);
+
+ /* Stabilize threads (move out of jump pads). */
+ stabilize_threads ();
}
else
{
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 (current_inferior->last_resume_kind == resume_stop
&& WSTOPSIG (w) == SIGSTOP)
{
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);
- current_inferior->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 lwp_info *lwp)
{
}
}
+/* 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 ()
+ && in_process_agent_loaded ()
+ && (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. */
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))
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 (lwp->suspended)
- fprintf (stderr, "BAD - reinserting and suspended(%d).\n",
- lwp->suspended);
+ 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
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;
lwp->resume = &r->resume[ndx];
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;
}
}
current_inferior = thread;
/* We can only step over breakpoints we know about. */
- if (breakpoint_here (pc))
+ if (breakpoint_here (pc) || fast_tracepoint_jump_here (pc))
{
/* Don't step over a breakpoint that GDB expects to hit
- though. */
- if (gdb_breakpoint_here (pc))
+ 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,
{
if (debug_threads)
fprintf (stderr,
- "Need step over [LWP %ld]? yes, found breakpoint at 0x%s\n",
+ "Need step over [LWP %ld]? yes, "
+ "found breakpoint at 0x%s\n",
lwpid_of (lwp), paddress (pc));
/* We've found an lwp that needs stepping over --- return 1 so
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;
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);
+
+ /* 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. */
return 0;
}
- if (thread->last_resume_kind == resume_stop)
+ 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
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));
+ & -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;
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). */
+/* Store one register. */
static void
-usr_store_inferior_registers (struct regcache *regcache, int regno)
+store_register (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 (regno >= the_low_target.num_regs)
+ return;
+ if ((*the_low_target.cannot_store_register) (regno))
+ return;
- if ((*the_low_target.cannot_store_register) (regno) == 1)
- return;
+ regaddr = register_addr (regno);
+ if (regaddr == -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);
+ 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);
+ 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))
+ 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)
{
- 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);
+ /* 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. */
+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)
+{
+ if (regno == -1)
for (regno = 0; regno < the_low_target.num_regs; regno++)
- usr_store_inferior_registers (regcache, regno);
+ store_register (regcache, regno);
+ else
+ store_register (regcache, regno);
}
#endif /* HAVE_LINUX_USRREGS */
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);
+ = (((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));
+ 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. */
__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)
-{
- int a = *(const int *)xa;
- int b = *(const int *)xb;
-
- return a - b;
-}
-
-static int *
-unique (int *b, int *e)
-{
- int *d = b;
- while (++b != e)
- if (*d != *b)
- *++d = *b;
- return ++d;
-}
-
-/* Given PID, iterates over all threads in that process.
-
- 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.
-
- 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. */
-
-static void
-list_threads (int pid, struct buffer *buffer, char **cores)
-{
- int count = 0;
- int allocated = 10;
- int *core_numbers = xmalloc (sizeof (int) * allocated);
- char pathname[128];
- DIR *dir;
- struct dirent *dp;
- struct stat statbuf;
-
- 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;
- }
-
- while ((dp = readdir (dir)) != NULL)
- {
- unsigned long lwp = strtoul (dp->d_name, NULL, 10);
-
- if (lwp != 0)
- {
- unsigned core = linux_core_of_thread (ptid_build (pid, lwp, 0));
-
- 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;
+ return linux_common_xfer_osdata (annex, readbuf, offset, len);
}
/* Convert a native/host siginfo object, into/from the siginfo in the
readbuf != NULL ? "Reading" : "Writing",
pid);
- if (offset > sizeof (siginfo))
+ if (offset >= sizeof (siginfo))
return -1;
if (ptrace (PTRACE_GETSIGINFO, pid, 0, &siginfo) != 0)
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 */
return 1;
}
+static int
+linux_supports_disable_randomization (void)
+{
+#ifdef HAVE_PERSONALITY
+ return 1;
+#else
+ return 0;
+#endif
+}
/* 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;
- for (;;)
- {
- int n;
- content = realloc (content, content_read + 1024);
- n = fread (content + content_read, 1, 1024, f);
- content_read += n;
- if (n < 1024)
- {
- content[content_read] = '\0';
- break;
- }
- }
-
- p = strchr (content, '(');
- p = strchr (p, ')') + 2; /* skip ")" and a whitespace. */
+ if (ptrace (LINUX_LOADMAP, pid, addr, &data) != 0)
+ return -1;
- p = strtok_r (p, " ", &ts);
- for (i = 0; i != 36; ++i)
- p = strtok_r (NULL, " ", &ts);
+ if (data == NULL)
+ return -1;
- if (sscanf (p, "%d", &core) == 0)
- core = -1;
+ actual_length = sizeof (struct target_loadmap)
+ + sizeof (struct target_loadseg) * data->nsegs;
- free (content);
- fclose (f);
+ if (offset < 0 || offset > actual_length)
+ return -1;
- return core;
+ 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)
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)
+ {
+ warning ("Unexpected missing PT_PHDR");
+ 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)
+ {
+ if (is_elf64)
+ {
+ 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;
+ }
+
+ 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;
+ }
+
+ 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 (lm_prev != l_prev)
+ {
+ warning ("Corrupted shared library list: 0x%lx != 0x%lx",
+ (long) lm_prev, (long) l_prev);
+ break;
+ }
+
+ /* 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;
+
+ 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_create_inferior,
linux_attach,
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,
NULL,
linux_pause_all,
linux_unpause_all,
- linux_cancel_breakpoints
+ 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,
};
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
}
projects / deliverable / binutils-gdb.git / blobdiff