/* libthread_db assisted debugging support, generic parts.
- Copyright (C) 1999-2016 Free Software Foundation, Inc.
+ Copyright (C) 1999-2019 Free Software Foundation, Inc.
This file is part of GDB.
#include "solib.h"
#include "solib-svr4.h"
#include "gdbcore.h"
-#include "observer.h"
+#include "observable.h"
#include "linux-nat.h"
#include "nat/linux-procfs.h"
#include "nat/linux-ptrace.h"
#include <signal.h>
#include <ctype.h>
#include "nat/linux-namespaces.h"
+#include <algorithm>
+#include "common/pathstuff.h"
+#include "valprint.h"
/* GNU/Linux libthread_db support.
of the ptid_t prevents thread IDs changing when libpthread is
loaded or unloaded. */
+static const target_info thread_db_target_info = {
+ "multi-thread",
+ N_("multi-threaded child process."),
+ N_("Threads and pthreads support.")
+};
+
+class thread_db_target final : public target_ops
+{
+public:
+ const target_info &info () const override
+ { return thread_db_target_info; }
+
+ strata stratum () const override { return thread_stratum; }
+
+ void detach (inferior *, int) override;
+ ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
+ void resume (ptid_t, int, enum gdb_signal) override;
+ void mourn_inferior () override;
+ void update_thread_list () override;
+ const char *pid_to_str (ptid_t) override;
+ CORE_ADDR get_thread_local_address (ptid_t ptid,
+ CORE_ADDR load_module_addr,
+ CORE_ADDR offset) override;
+ const char *extra_thread_info (struct thread_info *) override;
+ ptid_t get_ada_task_ptid (long lwp, long thread) override;
+
+ thread_info *thread_handle_to_thread_info (const gdb_byte *thread_handle,
+ int handle_len,
+ inferior *inf) override;
+};
+
static char *libthread_db_search_path;
/* Set to non-zero if thread_db auto-loading is enabled
by the "set auto-load libthread-db" command. */
static int auto_load_thread_db = 1;
+/* Set to non-zero if load-time libthread_db tests have been enabled
+ by the "maintenence set check-libthread-db" command. */
+static int check_thread_db_on_load = 0;
+
/* "show" command for the auto_load_thread_db configuration variable. */
static void
}
static void
-set_libthread_db_search_path (char *ignored, int from_tty,
+set_libthread_db_search_path (const char *ignored, int from_tty,
struct cmd_list_element *c)
{
if (*libthread_db_search_path == '\0')
threads. */
/* This module's target vector. */
-static struct target_ops thread_db_ops;
+static thread_db_target the_thread_db_target;
/* Non-zero if we have determined the signals used by the threads
library. */
td_init_ftype *td_init_p;
td_ta_new_ftype *td_ta_new_p;
+ td_ta_delete_ftype *td_ta_delete_p;
td_ta_map_lwp2thr_ftype *td_ta_map_lwp2thr_p;
td_ta_thr_iter_ftype *td_ta_thr_iter_p;
td_thr_get_info_ftype *td_thr_get_info_p;
bookkeeping. */
struct thread_db_info *thread_db_list;
-static void thread_db_find_new_threads_1 (ptid_t ptid);
-static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new);
+static void thread_db_find_new_threads_1 (thread_info *stopped);
+static void thread_db_find_new_threads_2 (thread_info *stopped,
+ bool until_no_new);
static void check_thread_signals (void);
{
struct thread_db_info *info = XCNEW (struct thread_db_info);
- info->pid = ptid_get_pid (inferior_ptid);
+ info->pid = inferior_ptid.pid ();
info->handle = handle;
/* The workaround works by reading from /proc/pid/status, so it is
return NULL;
}
+static const char *thread_db_err_str (td_err_e err);
+
/* When PID has exited or has been detached, we no longer want to keep
track of it as using libpthread. Call this function to discard
thread_db related info related to PID. Note that this closes
if (info == NULL)
return;
+ if (info->thread_agent != NULL && info->td_ta_delete_p != NULL)
+ {
+ td_err_e err = info->td_ta_delete_p (info->thread_agent);
+
+ if (err != TD_OK)
+ warning (_("Cannot deregister process %d from libthread_db: %s"),
+ pid, thread_db_err_str (err));
+ info->thread_agent = NULL;
+ }
+
if (info->handle != NULL)
dlclose (info->handle);
/* Use "struct private_thread_info" to cache thread state. This is
a substantial optimization. */
-struct private_thread_info
+struct thread_db_thread_info : public private_thread_info
{
/* Flag set when we see a TD_DEATH event for this thread. */
- unsigned int dying:1;
+ bool dying = false;
/* Cached thread state. */
- td_thrhandle_t th;
- thread_t tid;
+ td_thrhandle_t th {};
+ thread_t tid {};
};
-\f
-static char *
+static thread_db_thread_info *
+get_thread_db_thread_info (thread_info *thread)
+{
+ return static_cast<thread_db_thread_info *> (thread->priv.get ());
+}
+
+static const char *
thread_db_err_str (td_err_e err)
{
static char buf[64];
}
}
-/* Fetch the user-level thread id of PTID. */
+/* Fetch the user-level thread id of PTID. STOPPED is a stopped
+ thread that we can use to access memory. */
static struct thread_info *
-thread_from_lwp (ptid_t ptid)
+thread_from_lwp (thread_info *stopped, ptid_t ptid)
{
td_thrhandle_t th;
td_thrinfo_t ti;
/* This ptid comes from linux-nat.c, which should always fill in the
LWP. */
- gdb_assert (ptid_get_lwp (ptid) != 0);
+ gdb_assert (ptid.lwp () != 0);
- info = get_thread_db_info (ptid_get_pid (ptid));
+ info = get_thread_db_info (ptid.pid ());
/* Access an lwp we know is stopped. */
- info->proc_handle.ptid = ptid;
- err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid_get_lwp (ptid),
+ info->proc_handle.thread = stopped;
+ err = info->td_ta_map_lwp2thr_p (info->thread_agent, ptid.lwp (),
&th);
if (err != TD_OK)
error (_("Cannot find user-level thread for LWP %ld: %s"),
- ptid_get_lwp (ptid), thread_db_err_str (err));
+ ptid.lwp (), thread_db_err_str (err));
err = info->td_thr_get_info_p (&th, &ti);
if (err != TD_OK)
{
struct thread_db_info *info;
- info = get_thread_db_info (ptid_get_pid (child));
+ info = get_thread_db_info (child.pid ());
if (info == NULL)
return 0;
- thread_from_lwp (child);
+ thread_info *stopped = find_thread_ptid (parent);
- /* If we do not know about the main thread yet, this would be a good
- time to find it. */
- thread_from_lwp (parent);
+ thread_from_lwp (stopped, child);
+
+ /* If we do not know about the main thread's pthread info yet, this
+ would be a good time to find it. */
+ thread_from_lwp (stopped, parent);
return 1;
}
{
struct bound_minimal_symbol version_msym;
CORE_ADDR version_addr;
- char *version;
+ gdb::unique_xmalloc_ptr<char> version;
int err, got, retval = 0;
version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL);
version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym);
got = target_read_string (version_addr, &version, 32, &err);
- if (err == 0 && memchr (version, 0, got) == &version[got -1])
+ if (err == 0 && memchr (version.get (), 0, got) == version.get () + got - 1)
{
int major, minor;
- retval = (sscanf (version, "%d.%d", &major, &minor) == 2
+ retval = (sscanf (version.get (), "%d.%d", &major, &minor) == 2
&& (major < ver_major_min
|| (major == ver_major_min && minor < ver_minor_min)));
}
- xfree (version);
return retval;
}
otherwise. */
static int
-thread_db_find_new_threads_silently (ptid_t ptid)
+thread_db_find_new_threads_silently (thread_info *stopped)
{
TRY
{
- thread_db_find_new_threads_2 (ptid, 1);
+ thread_db_find_new_threads_2 (stopped, true);
}
CATCH (except, RETURN_MASK_ERROR)
return NULL;
}
+/* State for check_thread_db_callback. */
+
+struct check_thread_db_info
+{
+ /* The libthread_db under test. */
+ struct thread_db_info *info;
+
+ /* True if progress should be logged. */
+ bool log_progress;
+
+ /* True if the callback was called. */
+ bool threads_seen;
+
+ /* Name of last libthread_db function called. */
+ const char *last_call;
+
+ /* Value returned by last libthread_db call. */
+ td_err_e last_result;
+};
+
+static struct check_thread_db_info *tdb_testinfo;
+
+/* Callback for check_thread_db. */
+
+static int
+check_thread_db_callback (const td_thrhandle_t *th, void *arg)
+{
+ gdb_assert (tdb_testinfo != NULL);
+ tdb_testinfo->threads_seen = true;
+
+#define LOG(fmt, args...) \
+ do \
+ { \
+ if (tdb_testinfo->log_progress) \
+ { \
+ debug_printf (fmt, ## args); \
+ gdb_flush (gdb_stdlog); \
+ } \
+ } \
+ while (0)
+
+#define CHECK_1(expr, args...) \
+ do \
+ { \
+ if (!(expr)) \
+ { \
+ LOG (" ... FAIL!\n"); \
+ error (args); \
+ } \
+ } \
+ while (0)
+
+#define CHECK(expr) \
+ CHECK_1 (expr, "(%s) == false", #expr)
+
+#define CALL_UNCHECKED(func, args...) \
+ do \
+ { \
+ tdb_testinfo->last_call = #func; \
+ tdb_testinfo->last_result \
+ = tdb_testinfo->info->func ## _p (args); \
+ } \
+ while (0)
+
+#define CHECK_CALL() \
+ CHECK_1 (tdb_testinfo->last_result == TD_OK, \
+ _("%s failed: %s"), \
+ tdb_testinfo->last_call, \
+ thread_db_err_str (tdb_testinfo->last_result)) \
+
+#define CALL(func, args...) \
+ do \
+ { \
+ CALL_UNCHECKED (func, args); \
+ CHECK_CALL (); \
+ } \
+ while (0)
+
+ LOG (" Got thread");
+
+ /* Check td_ta_thr_iter passed consistent arguments. */
+ CHECK (th != NULL);
+ CHECK (arg == (void *) tdb_testinfo);
+ CHECK (th->th_ta_p == tdb_testinfo->info->thread_agent);
+
+ LOG (" %s", core_addr_to_string_nz ((CORE_ADDR) th->th_unique));
+
+ /* Check td_thr_get_info. */
+ td_thrinfo_t ti;
+ CALL (td_thr_get_info, th, &ti);
+
+ LOG (" => %d", ti.ti_lid);
+
+ CHECK (ti.ti_ta_p == th->th_ta_p);
+ CHECK (ti.ti_tid == (thread_t) th->th_unique);
+
+ /* Check td_ta_map_lwp2thr. */
+ td_thrhandle_t th2;
+ memset (&th2, 23, sizeof (td_thrhandle_t));
+ CALL_UNCHECKED (td_ta_map_lwp2thr, th->th_ta_p, ti.ti_lid, &th2);
+
+ if (tdb_testinfo->last_result == TD_ERR && !target_has_execution)
+ {
+ /* Some platforms require execution for td_ta_map_lwp2thr. */
+ LOG (_("; can't map_lwp2thr"));
+ }
+ else
+ {
+ CHECK_CALL ();
+
+ LOG (" => %s", core_addr_to_string_nz ((CORE_ADDR) th2.th_unique));
+
+ CHECK (memcmp (th, &th2, sizeof (td_thrhandle_t)) == 0);
+ }
+
+ /* Attempt TLS access. Assuming errno is TLS, this calls
+ thread_db_get_thread_local_address, which in turn calls
+ td_thr_tls_get_addr for live inferiors or td_thr_tlsbase
+ for core files. This test is skipped if the thread has
+ not been recorded; proceeding in that case would result
+ in the test having the side-effect of noticing threads
+ which seems wrong.
+
+ Note that in glibc's libthread_db td_thr_tls_get_addr is
+ a thin wrapper around td_thr_tlsbase; this check always
+ hits the bulk of the code.
+
+ Note also that we don't actually check any libthread_db
+ calls are made, we just assume they were; future changes
+ to how GDB accesses TLS could result in this passing
+ without exercising the calls it's supposed to. */
+ ptid_t ptid = ptid_t (tdb_testinfo->info->pid, ti.ti_lid, 0);
+ struct thread_info *thread_info = find_thread_ptid (ptid);
+ if (thread_info != NULL && thread_info->priv != NULL)
+ {
+ LOG ("; errno");
+
+ scoped_restore_current_thread restore_current_thread;
+ switch_to_thread (ptid);
+
+ expression_up expr = parse_expression ("(int) errno");
+ struct value *val = evaluate_expression (expr.get ());
+
+ if (tdb_testinfo->log_progress)
+ {
+ struct value_print_options opts;
+
+ get_user_print_options (&opts);
+ LOG (" = ");
+ value_print (val, gdb_stdlog, &opts);
+ }
+ }
+
+ LOG (" ... OK\n");
+
+#undef LOG
+#undef CHECK_1
+#undef CHECK
+#undef CALL_UNCHECKED
+#undef CHECK_CALL
+#undef CALL
+
+ return 0;
+}
+
+/* Run integrity checks on the dlopen()ed libthread_db described by
+ INFO. Returns true on success, displays a warning and returns
+ false on failure. Logs progress messages to gdb_stdlog during
+ the test if LOG_PROGRESS is true. */
+
+static bool
+check_thread_db (struct thread_db_info *info, bool log_progress)
+{
+ bool test_passed = true;
+
+ if (log_progress)
+ debug_printf (_("Running libthread_db integrity checks:\n"));
+
+ /* GDB avoids using td_ta_thr_iter wherever possible (see comment
+ in try_thread_db_load_1 below) so in order to test it we may
+ have to locate it ourselves. */
+ td_ta_thr_iter_ftype *td_ta_thr_iter_p = info->td_ta_thr_iter_p;
+ if (td_ta_thr_iter_p == NULL)
+ {
+ void *thr_iter = verbose_dlsym (info->handle, "td_ta_thr_iter");
+ if (thr_iter == NULL)
+ return 0;
+
+ td_ta_thr_iter_p = (td_ta_thr_iter_ftype *) thr_iter;
+ }
+
+ /* Set up the test state we share with the callback. */
+ gdb_assert (tdb_testinfo == NULL);
+ struct check_thread_db_info tdb_testinfo_buf;
+ tdb_testinfo = &tdb_testinfo_buf;
+
+ memset (tdb_testinfo, 0, sizeof (struct check_thread_db_info));
+ tdb_testinfo->info = info;
+ tdb_testinfo->log_progress = log_progress;
+
+ /* td_ta_thr_iter shouldn't be used on running processes. Note that
+ it's possible the inferior will stop midway through modifying one
+ of its thread lists, in which case the check will spuriously
+ fail. */
+ linux_stop_and_wait_all_lwps ();
+
+ TRY
+ {
+ td_err_e err = td_ta_thr_iter_p (info->thread_agent,
+ check_thread_db_callback,
+ tdb_testinfo,
+ TD_THR_ANY_STATE,
+ TD_THR_LOWEST_PRIORITY,
+ TD_SIGNO_MASK,
+ TD_THR_ANY_USER_FLAGS);
+
+ if (err != TD_OK)
+ error (_("td_ta_thr_iter failed: %s"), thread_db_err_str (err));
+
+ if (!tdb_testinfo->threads_seen)
+ error (_("no threads seen"));
+ }
+ CATCH (except, RETURN_MASK_ERROR)
+ {
+ if (warning_pre_print)
+ fputs_unfiltered (warning_pre_print, gdb_stderr);
+
+ exception_fprintf (gdb_stderr, except,
+ _("libthread_db integrity checks failed: "));
+
+ test_passed = false;
+ }
+ END_CATCH
+
+ if (test_passed && log_progress)
+ debug_printf (_("libthread_db integrity checks passed.\n"));
+
+ tdb_testinfo = NULL;
+
+ linux_unstop_all_lwps ();
+
+ return test_passed;
+}
+
/* Attempt to initialize dlopen()ed libthread_db, described by INFO.
Return 1 on success.
Failure could happen if libthread_db does not have symbols we expect,
CHK (TDB_VERBOSE_DLSYM (info, td_ta_new));
/* Initialize the structure that identifies the child process. */
- info->proc_handle.ptid = inferior_ptid;
+ info->proc_handle.thread = inferior_thread ();
/* Now attempt to open a connection to the thread library. */
err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent);
/* These are not essential. */
TDB_DLSYM (info, td_thr_tls_get_addr);
TDB_DLSYM (info, td_thr_tlsbase);
+ TDB_DLSYM (info, td_ta_delete);
/* It's best to avoid td_ta_thr_iter if possible. That walks data
structures in the inferior's address space that may be corrupted,
td_ta_map_lwp2thr uses ps_get_thread_area, but we can't use that
currently on core targets, as it uses ptrace directly. */
if (target_has_execution
- && linux_proc_task_list_dir_exists (ptid_get_pid (inferior_ptid)))
+ && linux_proc_task_list_dir_exists (inferior_ptid.pid ()))
info->td_ta_thr_iter_p = NULL;
else
CHK (TDB_VERBOSE_DLSYM (info, td_ta_thr_iter));
#undef TDB_DLSYM
#undef CHK
+ /* Run integrity checks if requested. */
+ if (check_thread_db_on_load)
+ {
+ if (!check_thread_db (info, libthread_db_debug))
+ return 0;
+ }
+
if (info->td_ta_thr_iter_p == NULL)
{
struct lwp_info *lp;
- int pid = ptid_get_pid (inferior_ptid);
+ int pid = inferior_ptid.pid ();
+ thread_info *curr_thread = inferior_thread ();
linux_stop_and_wait_all_lwps ();
ALL_LWPS (lp)
- if (ptid_get_pid (lp->ptid) == pid)
- thread_from_lwp (lp->ptid);
+ if (lp->ptid.pid () == pid)
+ thread_from_lwp (curr_thread, lp->ptid);
linux_unstop_all_lwps ();
}
- else if (thread_db_find_new_threads_silently (inferior_ptid) != 0)
+ else if (thread_db_find_new_threads_silently (inferior_thread ()) != 0)
{
/* Even if libthread_db initializes, if the thread list is
corrupted, we'd not manage to list any threads. Better reject this
/* The thread library was detected. Activate the thread_db target
if this is the first process using it. */
if (thread_db_list->next == NULL)
- push_target (&thread_db_ops);
+ push_target (&the_thread_db_target);
return 1;
}
/* Do not save system library name, that one is always trusted. */
if (strchr (library, '/') != NULL)
- info->filename = gdb_realpath (library);
+ info->filename = gdb_realpath (library).release ();
if (try_thread_db_load_1 (info))
return 1;
/* This library "refused" to work on current inferior. */
- delete_thread_db_info (ptid_get_pid (inferior_ptid));
+ delete_thread_db_info (inferior_ptid.pid ());
return 0;
}
static int
try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
{
- struct cleanup *cleanup;
- char *path, *cp;
- int result;
const char *obj_name = objfile_name (obj);
- int alloc_len;
if (obj_name[0] != '/')
{
return 0;
}
- alloc_len = (strlen (obj_name)
- + (subdir ? strlen (subdir) + 1 : 0)
- + 1 + strlen (LIBTHREAD_DB_SO) + 1);
- path = (char *) xmalloc (alloc_len);
- cleanup = make_cleanup (xfree, path);
-
- strcpy (path, obj_name);
- cp = strrchr (path, '/');
+ std::string path = obj_name;
+ size_t cp = path.rfind ('/');
/* This should at minimum hit the first character. */
- gdb_assert (cp != NULL);
- cp[1] = '\0';
+ gdb_assert (cp != std::string::npos);
+ path.resize (cp + 1);
if (subdir != NULL)
- {
- strcat (cp, subdir);
- strcat (cp, "/");
- }
- strcat (cp, LIBTHREAD_DB_SO);
-
- result = try_thread_db_load (path, 1);
+ path = path + subdir + "/";
+ path += LIBTHREAD_DB_SO;
- do_cleanups (cleanup);
- return result;
+ return try_thread_db_load (path.c_str (), 1);
}
/* Handle $pdir in libthread-db-search-path.
static int
try_thread_db_load_from_pdir (const char *subdir)
{
- struct objfile *obj;
-
if (!auto_load_thread_db)
return 0;
- ALL_OBJFILES (obj)
+ for (objfile *obj : all_objfiles (current_program_space))
if (libpthread_name_p (objfile_name (obj)))
{
if (try_thread_db_load_from_pdir_1 (obj, subdir))
static int
try_thread_db_load_from_dir (const char *dir, size_t dir_len)
{
- struct cleanup *cleanup;
- char *path;
- int result;
-
if (!auto_load_thread_db)
return 0;
- path = (char *) xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1);
- cleanup = make_cleanup (xfree, path);
-
- memcpy (path, dir, dir_len);
- path[dir_len] = '/';
- strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
+ std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO;
- result = try_thread_db_load (path, 1);
-
- do_cleanups (cleanup);
- return result;
+ return try_thread_db_load (path.c_str (), 1);
}
/* Search libthread_db_search_path for libthread_db which "agrees"
static int
thread_db_load_search (void)
{
- VEC (char_ptr) *dir_vec;
- struct cleanup *cleanups;
- char *this_dir;
- int i, rc = 0;
+ int rc = 0;
- dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
- cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
+ std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec
+ = dirnames_to_char_ptr_vec (libthread_db_search_path);
- for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
+ for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec)
{
+ const char *this_dir = this_dir_up.get ();
const int pdir_len = sizeof ("$pdir") - 1;
size_t this_dir_len;
&& (this_dir[pdir_len] == '\0'
|| this_dir[pdir_len] == '/'))
{
- char *subdir = NULL;
- struct cleanup *free_subdir_cleanup
- = make_cleanup (null_cleanup, NULL);
+ const char *subdir = NULL;
+ std::string subdir_holder;
if (this_dir[pdir_len] == '/')
{
- subdir = (char *) xmalloc (strlen (this_dir));
- make_cleanup (xfree, subdir);
- strcpy (subdir, this_dir + pdir_len + 1);
+ subdir_holder = std::string (this_dir + pdir_len + 1);
+ subdir = subdir_holder.c_str ();
}
rc = try_thread_db_load_from_pdir (subdir);
- do_cleanups (free_subdir_cleanup);
if (rc)
break;
}
}
}
- do_cleanups (cleanups);
if (libthread_db_debug)
fprintf_unfiltered (gdb_stdlog,
_("thread_db_load_search returning %d\n"), rc);
static int
has_libpthread (void)
{
- struct objfile *obj;
-
- ALL_OBJFILES (obj)
+ for (objfile *obj : all_objfiles (current_program_space))
if (libpthread_name_p (objfile_name (obj)))
return 1;
{
struct thread_db_info *info;
- info = get_thread_db_info (ptid_get_pid (inferior_ptid));
+ info = get_thread_db_info (inferior_ptid.pid ());
if (info != NULL)
return 1;
return 0;
/* Don't attempt to use thread_db for remote targets. */
- if (!(target_can_run (¤t_target) || core_bfd))
+ if (!(target_can_run () || core_bfd))
return 0;
if (thread_db_load_search ())
if (objfile != NULL
/* libpthread with separate debug info has its debug info file already
loaded (and notified without successful thread_db initialization)
- the time observer_notify_new_objfile is called for the library itself.
+ the time gdb::observers::new_objfile.notify is called for the library itself.
Static executables have their separate debug info loaded already
before the inferior has started. */
&& objfile->separate_debug_objfile_backlink == NULL
check_pid_namespace_match (void)
{
/* Check is only relevant for local targets targets. */
- if (target_can_run (¤t_target))
+ if (target_can_run ())
{
/* If the child is in a different PID namespace, its idea of its
PID will differ from our idea of its PID. When we scan the
child's thread list, we'll mistakenly think it has no threads
since the thread PID fields won't match the PID we give to
libthread_db. */
- if (!linux_ns_same (ptid_get_pid (inferior_ptid), LINUX_NS_PID))
+ if (!linux_ns_same (inferior_ptid.pid (), LINUX_NS_PID))
{
warning (_ ("Target and debugger are in different PID "
"namespaces; thread lists and other data are "
from libthread_db thread state information. */
static void
-update_thread_state (struct private_thread_info *priv,
+update_thread_state (thread_db_thread_info *priv,
const td_thrinfo_t *ti_p)
{
priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN
ptid_t ptid, const td_thrhandle_t *th_p,
const td_thrinfo_t *ti_p)
{
- struct private_thread_info *priv;
-
/* A thread ID of zero may mean the thread library has not
initialized yet. Leave private == NULL until the thread library
has initialized. */
return tp;
/* Construct the thread's private data. */
- priv = XCNEW (struct private_thread_info);
+ thread_db_thread_info *priv = new thread_db_thread_info;
priv->th = *th_p;
priv->tid = ti_p->ti_tid;
if (tp == NULL || tp->state == THREAD_EXITED)
tp = add_thread_with_info (ptid, priv);
else
- tp->priv = priv;
+ tp->priv.reset (priv);
if (target_has_execution)
check_thread_signals ();
return tp;
}
-static void
-thread_db_detach (struct target_ops *ops, const char *args, int from_tty)
+void
+thread_db_target::detach (inferior *inf, int from_tty)
{
- struct target_ops *target_beneath = find_target_beneath (ops);
- struct thread_db_info *info;
-
- info = get_thread_db_info (ptid_get_pid (inferior_ptid));
-
- if (info)
- delete_thread_db_info (ptid_get_pid (inferior_ptid));
+ delete_thread_db_info (inf->pid);
- target_beneath->to_detach (target_beneath, args, from_tty);
+ beneath ()->detach (inf, from_tty);
/* NOTE: From this point on, inferior_ptid is null_ptid. */
/* If there are no more processes using libpthread, detach the
thread_db target ops. */
if (!thread_db_list)
- unpush_target (&thread_db_ops);
+ unpush_target (this);
}
-static ptid_t
-thread_db_wait (struct target_ops *ops,
- ptid_t ptid, struct target_waitstatus *ourstatus,
- int options)
+ptid_t
+thread_db_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
+ int options)
{
struct thread_db_info *info;
- struct target_ops *beneath = find_target_beneath (ops);
- ptid = beneath->to_wait (beneath, ptid, ourstatus, options);
+ ptid = beneath ()->wait (ptid, ourstatus, options);
switch (ourstatus->kind)
{
return ptid;
}
- info = get_thread_db_info (ptid_get_pid (ptid));
+ info = get_thread_db_info (ptid.pid ());
/* If this process isn't using thread_db, we're done. */
if (info == NULL)
{
/* New image, it may or may not end up using thread_db. Assume
not unless we find otherwise. */
- delete_thread_db_info (ptid_get_pid (ptid));
+ delete_thread_db_info (ptid.pid ());
if (!thread_db_list)
- unpush_target (&thread_db_ops);
+ unpush_target (&the_thread_db_target);
return ptid;
}
/* Fill in the thread's user-level thread id and status. */
- thread_from_lwp (ptid);
+ thread_from_lwp (find_thread_ptid (ptid), ptid);
return ptid;
}
-static void
-thread_db_mourn_inferior (struct target_ops *ops)
+void
+thread_db_target::mourn_inferior ()
{
- struct target_ops *target_beneath = find_target_beneath (ops);
+ delete_thread_db_info (inferior_ptid.pid ());
- delete_thread_db_info (ptid_get_pid (inferior_ptid));
-
- target_beneath->to_mourn_inferior (target_beneath);
+ beneath ()->mourn_inferior ();
/* Detach thread_db target ops. */
if (!thread_db_list)
- unpush_target (ops);
+ unpush_target (&the_thread_db_target);
}
struct callback_data
{
td_thrinfo_t ti;
td_err_e err;
- ptid_t ptid;
struct thread_info *tp;
struct callback_data *cb_data = (struct callback_data *) data;
struct thread_db_info *info = cb_data->info;
return 0;
}
- ptid = ptid_build (info->pid, ti.ti_lid, 0);
+ ptid_t ptid (info->pid, ti.ti_lid);
tp = find_thread_ptid (ptid);
if (tp == NULL || tp->priv == NULL)
record_thread (info, tp, ptid, th_p, &ti);
searches in a row do not discover any new threads. */
static void
-thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
+thread_db_find_new_threads_2 (thread_info *stopped, bool until_no_new)
{
td_err_e err = TD_OK;
struct thread_db_info *info;
int i, loop;
- info = get_thread_db_info (ptid_get_pid (ptid));
+ info = get_thread_db_info (stopped->ptid.pid ());
/* Access an lwp we know is stopped. */
- info->proc_handle.ptid = ptid;
+ info->proc_handle.thread = stopped;
if (until_no_new)
{
}
static void
-thread_db_find_new_threads_1 (ptid_t ptid)
+thread_db_find_new_threads_1 (thread_info *stopped)
{
- thread_db_find_new_threads_2 (ptid, 0);
+ thread_db_find_new_threads_2 (stopped, 0);
}
/* Implement the to_update_thread_list target method for this
target. */
-static void
-thread_db_update_thread_list (struct target_ops *ops)
+void
+thread_db_target::update_thread_list ()
{
struct thread_db_info *info;
- struct inferior *inf;
prune_threads ();
- ALL_INFERIORS (inf)
+ for (inferior *inf : all_inferiors ())
{
struct thread_info *thread;
if (info == NULL)
continue;
- thread = any_live_thread_of_process (inf->pid);
+ thread = any_live_thread_of_inferior (inf);
if (thread == NULL || thread->executing)
continue;
if (target_has_execution_1 (thread->ptid))
continue;
- thread_db_find_new_threads_1 (thread->ptid);
+ thread_db_find_new_threads_1 (thread);
}
/* Give the beneath target a chance to do extra processing. */
- ops->beneath->to_update_thread_list (ops->beneath);
+ this->beneath ()->update_thread_list ();
}
-static char *
-thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid)
+const char *
+thread_db_target::pid_to_str (ptid_t ptid)
{
struct thread_info *thread_info = find_thread_ptid (ptid);
- struct target_ops *beneath;
if (thread_info != NULL && thread_info->priv != NULL)
{
static char buf[64];
- thread_t tid;
+ thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
- tid = thread_info->priv->tid;
snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
- (unsigned long) tid, ptid_get_lwp (ptid));
+ (unsigned long) priv->tid, ptid.lwp ());
return buf;
}
- beneath = find_target_beneath (ops);
- return beneath->to_pid_to_str (beneath, ptid);
+ return beneath ()->pid_to_str (ptid);
}
/* Return a string describing the state of the thread specified by
INFO. */
-static char *
-thread_db_extra_thread_info (struct target_ops *self,
- struct thread_info *info)
+const char *
+thread_db_target::extra_thread_info (thread_info *info)
{
if (info->priv == NULL)
return NULL;
- if (info->priv->dying)
+ thread_db_thread_info *priv = get_thread_db_thread_info (info);
+
+ if (priv->dying)
return "Exiting";
return NULL;
}
+/* Return pointer to the thread_info struct which corresponds to
+ THREAD_HANDLE (having length HANDLE_LEN). */
+
+thread_info *
+thread_db_target::thread_handle_to_thread_info (const gdb_byte *thread_handle,
+ int handle_len,
+ inferior *inf)
+{
+ thread_t handle_tid;
+
+ /* Thread handle sizes must match in order to proceed. We don't use an
+ assert here because the resulting internal error will cause GDB to
+ exit. This isn't necessarily an internal error due to the possibility
+ of garbage being passed as the thread handle via the python interface. */
+ if (handle_len != sizeof (handle_tid))
+ error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"),
+ handle_len, sizeof (handle_tid));
+
+ handle_tid = * (const thread_t *) thread_handle;
+
+ for (thread_info *tp : inf->non_exited_threads ())
+ {
+ thread_db_thread_info *priv = get_thread_db_thread_info (tp);
+
+ if (priv != NULL && handle_tid == priv->tid)
+ return tp;
+ }
+
+ return NULL;
+}
+
/* Get the address of the thread local variable in load module LM which
is stored at OFFSET within the thread local storage for thread PTID. */
-static CORE_ADDR
-thread_db_get_thread_local_address (struct target_ops *ops,
- ptid_t ptid,
- CORE_ADDR lm,
- CORE_ADDR offset)
+CORE_ADDR
+thread_db_target::get_thread_local_address (ptid_t ptid,
+ CORE_ADDR lm,
+ CORE_ADDR offset)
{
struct thread_info *thread_info;
- struct target_ops *beneath;
/* Find the matching thread. */
thread_info = find_thread_ptid (ptid);
/* We may not have discovered the thread yet. */
if (thread_info != NULL && thread_info->priv == NULL)
- thread_info = thread_from_lwp (ptid);
+ thread_info = thread_from_lwp (thread_info, ptid);
if (thread_info != NULL && thread_info->priv != NULL)
{
td_err_e err;
psaddr_t address;
- struct thread_db_info *info;
-
- info = get_thread_db_info (ptid_get_pid (ptid));
+ thread_db_info *info = get_thread_db_info (ptid.pid ());
+ thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
/* Finally, get the address of the variable. */
if (lm != 0)
/* Note the cast through uintptr_t: this interface only works if
a target address fits in a psaddr_t, which is a host pointer.
So a 32-bit debugger can not access 64-bit TLS through this. */
- err = info->td_thr_tls_get_addr_p (&thread_info->priv->th,
+ err = info->td_thr_tls_get_addr_p (&priv->th,
(psaddr_t)(uintptr_t) lm,
offset, &address);
}
PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
The constant number 1 depends on GNU __libc_setup_tls
initialization of l_tls_modid to 1. */
- err = info->td_thr_tlsbase_p (&thread_info->priv->th,
- 1, &address);
+ err = info->td_thr_tlsbase_p (&priv->th, 1, &address);
address = (char *) address + offset;
}
: (CORE_ADDR) (uintptr_t) address);
}
- beneath = find_target_beneath (ops);
- return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
+ return beneath ()->get_thread_local_address (ptid, lm, offset);
}
/* Implement the to_get_ada_task_ptid target method for this target. */
-static ptid_t
-thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
+ptid_t
+thread_db_target::get_ada_task_ptid (long lwp, long thread)
{
/* NPTL uses a 1:1 model, so the LWP id suffices. */
- return ptid_build (ptid_get_pid (inferior_ptid), lwp, 0);
+ return ptid_t (inferior_ptid.pid (), lwp, 0);
}
-static void
-thread_db_resume (struct target_ops *ops,
- ptid_t ptid, int step, enum gdb_signal signo)
+void
+thread_db_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
{
- struct target_ops *beneath = find_target_beneath (ops);
struct thread_db_info *info;
- if (ptid_equal (ptid, minus_one_ptid))
- info = get_thread_db_info (ptid_get_pid (inferior_ptid));
+ if (ptid == minus_one_ptid)
+ info = get_thread_db_info (inferior_ptid.pid ());
else
- info = get_thread_db_info (ptid_get_pid (ptid));
+ info = get_thread_db_info (ptid.pid ());
/* This workaround is only needed for child fork lwps stopped in a
PTRACE_O_TRACEFORK event. When the inferior is resumed, the
if (info)
info->need_stale_parent_threads_check = 0;
- beneath->to_resume (beneath, ptid, step, signo);
+ beneath ()->resume (ptid, step, signo);
}
-/* qsort helper function for info_auto_load_libthread_db, sort the
+/* std::sort helper function for info_auto_load_libthread_db, sort the
thread_db_info pointers primarily by their FILENAME and secondarily by their
PID, both in ascending order. */
-static int
-info_auto_load_libthread_db_compare (const void *ap, const void *bp)
+static bool
+info_auto_load_libthread_db_compare (const struct thread_db_info *a,
+ const struct thread_db_info *b)
{
- struct thread_db_info *a = *(struct thread_db_info **) ap;
- struct thread_db_info *b = *(struct thread_db_info **) bp;
int retval;
retval = strcmp (a->filename, b->filename);
if (retval)
- return retval;
+ return retval < 0;
- return (a->pid > b->pid) - (a->pid - b->pid);
+ return a->pid < b->pid;
}
/* Implement 'info auto-load libthread-db'. */
static void
-info_auto_load_libthread_db (char *args, int from_tty)
+info_auto_load_libthread_db (const char *args, int from_tty)
{
struct ui_out *uiout = current_uiout;
const char *cs = args ? args : "";
- struct thread_db_info *info, **array;
- unsigned info_count, unique_filenames;
- size_t max_filename_len, max_pids_len, pids_len;
- struct cleanup *back_to;
- char *pids;
+ struct thread_db_info *info;
+ unsigned unique_filenames;
+ size_t max_filename_len, pids_len;
int i;
- cs = skip_spaces_const (cs);
+ cs = skip_spaces (cs);
if (*cs)
error (_("'info auto-load libthread-db' does not accept any parameters"));
- info_count = 0;
- for (info = thread_db_list; info; info = info->next)
- if (info->filename != NULL)
- info_count++;
-
- array = XNEWVEC (struct thread_db_info *, info_count);
- back_to = make_cleanup (xfree, array);
-
- info_count = 0;
+ std::vector<struct thread_db_info *> array;
for (info = thread_db_list; info; info = info->next)
if (info->filename != NULL)
- array[info_count++] = info;
+ array.push_back (info);
/* Sort ARRAY by filenames and PIDs. */
-
- qsort (array, info_count, sizeof (*array),
- info_auto_load_libthread_db_compare);
+ std::sort (array.begin (), array.end (),
+ info_auto_load_libthread_db_compare);
/* Calculate the number of unique filenames (rows) and the maximum string
length of PIDs list for the unique filenames (columns). */
unique_filenames = 0;
max_filename_len = 0;
- max_pids_len = 0;
pids_len = 0;
- for (i = 0; i < info_count; i++)
+ for (i = 0; i < array.size (); i++)
{
int pid = array[i]->pid;
size_t this_pid_len;
if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0)
{
unique_filenames++;
- max_filename_len = max (max_filename_len,
- strlen (array[i]->filename));
+ max_filename_len = std::max (max_filename_len,
+ strlen (array[i]->filename));
if (i > 0)
- {
- pids_len -= strlen (", ");
- max_pids_len = max (max_pids_len, pids_len);
- }
+ pids_len -= strlen (", ");
pids_len = 0;
}
pids_len += this_pid_len + strlen (", ");
}
if (i)
- {
- pids_len -= strlen (", ");
- max_pids_len = max (max_pids_len, pids_len);
- }
+ pids_len -= strlen (", ");
/* Table header shifted right by preceding "libthread-db: " would not match
its columns. */
- if (info_count > 0 && args == auto_load_info_scripts_pattern_nl)
- ui_out_text (uiout, "\n");
+ if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl)
+ uiout->text ("\n");
- make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames,
- "LinuxThreadDbTable");
+ {
+ ui_out_emit_table table_emitter (uiout, 2, unique_filenames,
+ "LinuxThreadDbTable");
- ui_out_table_header (uiout, max_filename_len, ui_left, "filename",
- "Filename");
- ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids");
- ui_out_table_body (uiout);
+ uiout->table_header (max_filename_len, ui_left, "filename", "Filename");
+ uiout->table_header (pids_len, ui_left, "PIDs", "Pids");
+ uiout->table_body ();
- pids = (char *) xmalloc (max_pids_len + 1);
- make_cleanup (xfree, pids);
-
- /* Note I is incremented inside the cycle, not at its end. */
- for (i = 0; i < info_count;)
- {
- struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
- char *pids_end;
-
- info = array[i];
- ui_out_field_string (uiout, "filename", info->filename);
- pids_end = pids;
-
- while (i < info_count && strcmp (info->filename, array[i]->filename) == 0)
- {
- if (pids_end != pids)
- {
- *pids_end++ = ',';
- *pids_end++ = ' ';
- }
- pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end,
- "%u", array[i]->pid);
- gdb_assert (pids_end < &pids[max_pids_len + 1]);
+ /* Note I is incremented inside the cycle, not at its end. */
+ for (i = 0; i < array.size ();)
+ {
+ ui_out_emit_tuple tuple_emitter (uiout, NULL);
- i++;
- }
- *pids_end = '\0';
+ info = array[i];
+ uiout->field_string ("filename", info->filename);
- ui_out_field_string (uiout, "pids", pids);
+ std::string pids;
+ while (i < array.size () && strcmp (info->filename,
+ array[i]->filename) == 0)
+ {
+ if (!pids.empty ())
+ pids += ", ";
+ string_appendf (pids, "%u", array[i]->pid);
+ i++;
+ }
- ui_out_text (uiout, "\n");
- do_cleanups (chain);
- }
+ uiout->field_string ("pids", pids.c_str ());
- do_cleanups (back_to);
+ uiout->text ("\n");
+ }
+ }
- if (info_count == 0)
- ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n"));
+ if (array.empty ())
+ uiout->message (_("No auto-loaded libthread-db.\n"));
}
+/* Implement 'maintenance check libthread-db'. */
+
static void
-init_thread_db_ops (void)
+maintenance_check_libthread_db (const char *args, int from_tty)
{
- thread_db_ops.to_shortname = "multi-thread";
- thread_db_ops.to_longname = "multi-threaded child process.";
- thread_db_ops.to_doc = "Threads and pthreads support.";
- thread_db_ops.to_detach = thread_db_detach;
- thread_db_ops.to_wait = thread_db_wait;
- thread_db_ops.to_resume = thread_db_resume;
- thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
- thread_db_ops.to_update_thread_list = thread_db_update_thread_list;
- thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
- thread_db_ops.to_stratum = thread_stratum;
- thread_db_ops.to_has_thread_control = tc_schedlock;
- thread_db_ops.to_get_thread_local_address
- = thread_db_get_thread_local_address;
- thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
- thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid;
- thread_db_ops.to_magic = OPS_MAGIC;
-
- complete_target_initialization (&thread_db_ops);
-}
+ int inferior_pid = inferior_ptid.pid ();
+ struct thread_db_info *info;
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_thread_db;
+ if (inferior_pid == 0)
+ error (_("No inferior running"));
+
+ info = get_thread_db_info (inferior_pid);
+ if (info == NULL)
+ error (_("No libthread_db loaded"));
+
+ check_thread_db (info, true);
+}
void
_initialize_thread_db (void)
{
- init_thread_db_ops ();
-
/* Defer loading of libthread_db.so until inferior is running.
This allows gdb to load correct libthread_db for a given
executable -- there could be multiple versions of glibc,
Usage: info auto-load libthread-db"),
auto_load_info_cmdlist_get ());
+ add_cmd ("libthread-db", class_maintenance,
+ maintenance_check_libthread_db, _("\
+Run integrity checks on the current inferior's libthread_db."),
+ &maintenancechecklist);
+
+ add_setshow_boolean_cmd ("check-libthread-db",
+ class_maintenance,
+ &check_thread_db_on_load, _("\
+Set whether to check libthread_db at load time."), _("\
+Show whether to check libthread_db at load time."), _("\
+If enabled GDB will run integrity checks on inferior specific libthread_db\n\
+as they are loaded."),
+ NULL,
+ NULL,
+ &maintenance_set_cmdlist,
+ &maintenance_show_cmdlist);
+
/* Add ourselves to objfile event chain. */
- observer_attach_new_objfile (thread_db_new_objfile);
+ gdb::observers::new_objfile.attach (thread_db_new_objfile);
/* Add ourselves to inferior_created event chain.
This is needed to handle debugging statically linked programs where
the new_objfile observer won't get called for libpthread. */
- observer_attach_inferior_created (thread_db_inferior_created);
+ gdb::observers::inferior_created.attach (thread_db_inferior_created);
}
projects / deliverable / binutils-gdb.git / blobdiff