xtensa: add support for NPTL

Changes from:
https://github.com/foss-xtensa/uClibc/commits/xtensa_nptl

Author: Chris Zankel <chris@zankel.net>
Author: Baruch Siach <baruch@tkos.co.il>

1 files changed, 119 insertions, 0 deletions

diff --git a/ldso/include/tlsdeschtab.h b/ldso/include/tlsdeschtab.h
new file mode 100644
index 000000000..86baea148
--- /dev/null
+++ b/ldso/include/tlsdeschtab.h
@@ -0,0 +1,119 @@
+/* Hash table for TLS descriptors.
+   Copyright (C) 2005-2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Alexandre Oliva  <aoliva@redhat.com>
+
+   uClibc port by Baruch Siach <baruch@tkos.co.il>
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef TLSDESCHTAB_H
+# define TLSDESCHTAB_H 1
+
+# ifdef SHARED
+
+#  include <inline-hashtab.h>
+
+inline static int
+hash_tlsdesc (void *p)
+{
+  struct tlsdesc_dynamic_arg *td = p;
+
+  /* We know all entries are for the same module, so ti_offset is the
+     only distinguishing entry.  */
+  return td->tlsinfo.ti_offset;
+}
+
+inline static int
+eq_tlsdesc (void *p, void *q)
+{
+  struct tlsdesc_dynamic_arg *tdp = p, *tdq = q;
+
+  return tdp->tlsinfo.ti_offset == tdq->tlsinfo.ti_offset;
+}
+
+inline static int
+map_generation (struct link_map *map)
+{
+  size_t idx = map->l_tls_modid;
+  struct dtv_slotinfo_list *listp = GL(dl_tls_dtv_slotinfo_list);
+
+  /* Find the place in the dtv slotinfo list.  */
+  do
+    {
+      /* Does it fit in the array of this list element?  */
+      if (idx < listp->len)
+	{
+	  /* We should never get here for a module in static TLS, so
+	     we can assume that, if the generation count is zero, we
+	     still haven't determined the generation count for this
+	     module.  */
+	  if (listp->slotinfo[idx].gen)
+	    return listp->slotinfo[idx].gen;
+	  else
+	    break;
+	}
+      idx -= listp->len;
+      listp = listp->next;
+    }
+  while (listp != NULL);
+
+  /* If we get to this point, the module still hasn't been assigned an
+     entry in the dtv slotinfo data structures, and it will when we're
+     done with relocations.  At that point, the module will get a
+     generation number that is one past the current generation, so
+     return exactly that.  */
+  return GL(dl_tls_generation) + 1;
+}
+
+void *
+internal_function
+_dl_make_tlsdesc_dynamic (struct link_map *map, size_t ti_offset)
+{
+  struct funcdesc_ht *ht;
+  void **entry;
+  struct tlsdesc_dynamic_arg *td, test;
+
+  ht = map->l_tlsdesc_table;
+  if (! ht)
+    {
+      ht = htab_create ();
+      if (! ht)
+	  return 0;
+      map->l_tlsdesc_table = ht;
+    }
+
+  test.tlsinfo.ti_module = map->l_tls_modid;
+  test.tlsinfo.ti_offset = ti_offset;
+  entry = htab_find_slot (ht, &test, 1, hash_tlsdesc, eq_tlsdesc);
+  if (*entry)
+    {
+      td = *entry;
+      return td;
+    }
+
+  *entry = td = _dl_malloc (sizeof (struct tlsdesc_dynamic_arg));
+  /* This may be higher than the map's generation, but it doesn't
+     matter much.  Worst case, we'll have one extra DTV update per
+     thread.  */
+  td->gen_count = map_generation (map);
+  td->tlsinfo = test.tlsinfo;
+
+  return td;
+}
+
+# endif /* SHARED */
+
+#endif