along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-
-#include "gdb_assert.h"
#include <dlfcn.h>
#include "gdb_proc_service.h"
-#include "gdb_thread_db.h"
+#include "nat/gdb_thread_db.h"
#include "gdb_vecs.h"
#include "bfd.h"
#include "command.h"
-#include "exceptions.h"
#include "gdbcmd.h"
#include "gdbthread.h"
#include "inferior.h"
+#include "infrun.h"
#include "symfile.h"
#include "objfiles.h"
#include "target.h"
#include "gdbcore.h"
#include "observer.h"
#include "linux-nat.h"
-#include "linux-procfs.h"
-#include "linux-osdata.h"
+#include "nat/linux-procfs.h"
+#include "nat/linux-osdata.h"
#include "auto-load.h"
#include "cli/cli-utils.h"
td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
psaddr_t map_address,
size_t offset, psaddr_t *address);
+ td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th,
+ unsigned long int modid,
+ psaddr_t *base);
};
/* List of known processes using thread_db, and the required
info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg");
info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable");
info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr");
+ info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase");
if (thread_db_find_new_threads_silently (inferior_ptid) != 0)
{
check_for_thread_db ();
}
+static void
+check_pid_namespace_match (void)
+{
+ /* Check is only relevant for local targets targets. */
+ if (target_can_run (¤t_target))
+ {
+ /* 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. */
+ char *our_pid_ns = linux_proc_pid_get_ns (getpid (), "pid");
+ char *inferior_pid_ns = linux_proc_pid_get_ns (
+ ptid_get_pid (inferior_ptid), "pid");
+
+ if (our_pid_ns != NULL && inferior_pid_ns != NULL
+ && strcmp (our_pid_ns, inferior_pid_ns) != 0)
+ {
+ warning (_ ("Target and debugger are in different PID "
+ "namespaces; thread lists and other data are "
+ "likely unreliable"));
+ }
+
+ xfree (our_pid_ns);
+ xfree (inferior_pid_ns);
+ }
+}
+
/* This function is called via the inferior_created observer.
This handles the case of debugging statically linked executables. */
static void
thread_db_inferior_created (struct target_ops *target, int from_tty)
{
+ check_pid_namespace_match ();
check_for_thread_db ();
}
}
static void
-thread_db_find_new_threads (struct target_ops *ops)
+thread_db_update_thread_list (struct target_ops *ops)
{
struct thread_db_info *info;
struct inferior *inf;
+ prune_threads ();
+
ALL_INFERIORS (inf)
{
struct thread_info *thread;
}
beneath = find_target_beneath (ops);
- if (beneath->to_pid_to_str (beneath, ptid))
- return beneath->to_pid_to_str (beneath, ptid);
-
- return normal_pid_to_str (ptid);
+ return beneath->to_pid_to_str (beneath, ptid);
}
/* Return a string describing the state of the thread specified by
info = get_thread_db_info (ptid_get_pid (ptid));
- /* glibc doesn't provide the needed interface. */
- if (!info->td_thr_tls_get_addr_p)
- throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
- _("No TLS library support"));
-
- /* Caller should have verified that lm != 0. */
- gdb_assert (lm != 0);
-
/* Finally, get the address of the variable. */
- /* 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->private->th,
- (psaddr_t)(uintptr_t) lm,
- offset, &address);
+ if (lm != 0)
+ {
+ /* glibc doesn't provide the needed interface. */
+ if (!info->td_thr_tls_get_addr_p)
+ throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
+ _("No TLS library support"));
+
+ /* 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->private->th,
+ (psaddr_t)(uintptr_t) lm,
+ offset, &address);
+ }
+ else
+ {
+ /* If glibc doesn't provide the needed interface throw an error
+ that LM is zero - normally cases it should not be. */
+ if (!info->td_thr_tlsbase_p)
+ throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR,
+ _("TLS load module not found"));
+
+ /* This code path handles the case of -static -pthread executables:
+ https://sourceware.org/ml/libc-help/2014-03/msg00024.html
+ For older GNU libc r_debug.r_map is NULL. For GNU libc after
+ 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->private->th,
+ 1, &address);
+ address = (char *) address + offset;
+ }
#ifdef THREAD_DB_HAS_TD_NOTALLOC
/* The memory hasn't been allocated, yet. */
}
beneath = find_target_beneath (ops);
- if (beneath->to_get_thread_local_address)
- return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
- else
- throw_error (TLS_GENERIC_ERROR,
- _("TLS not supported on this target"));
+ return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
}
/* Callback routine used to find a thread based on the TID part of
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_find_new_threads = thread_db_find_new_threads;
+ 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;
projects / deliverable / binutils-gdb.git / blobdiff