Make libthread_db work without libpthread, just enough for TLS decoding.roland/nptl_db

3 files changed, 49 insertions, 0 deletions

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 494b590..d8dee1c 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-23  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/pthread/dl-sysdep.c: New file.
+	* sysdeps/pthread/Versions: New file.
+
 2009-11-27  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/sh/pt-initfini.c (_init): Don't call
diff --git a/nptl/sysdeps/pthread/Versions b/nptl/sysdeps/pthread/Versions
new file mode 100644
index 0000000..ab6aec0
--- /dev/null
+++ b/nptl/sysdeps/pthread/Versions
@@ -0,0 +1,6 @@
+ld {
+  GLIBC_PRIVATE {
+    # These are used by libthread_db, so must be visible somehow.
+    _thread_db_*;
+  }
+}
diff --git a/nptl/sysdeps/pthread/dl-sysdep.c b/nptl/sysdeps/pthread/dl-sysdep.c
new file mode 100644
index 0000000..3dbeebc
--- /dev/null
+++ b/nptl/sysdeps/pthread/dl-sysdep.c
@@ -0,0 +1,38 @@
+/* libthread_db hooks in the dynamic linker.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This cpp magic lets us use #include_next in the #else branch.  */
+#ifndef IS_IN_dl_sysdep
+# define IS_IN_dl_sysdep 1
+# include <dl-sysdep.c>
+#else
+
+# include_next <dl-sysdep.c>
+
+/* A dynamic linker with TLS support needs to make some information
+   available to libthread_db so debuggers can figure out TLS lookups
+   even when libpthread is not loaded.  */
+
+# include <version.h>
+
+const char _thread_db_dl_nptl_version[] __attribute_used__ = VERSION;
+
+# include <../nptl_db/db_info.c>
+
+#endif