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authorWaldemar Brodkorb <wbx@openadk.org>2014-09-20 22:36:23 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2014-09-22 20:35:40 +0200
commit4c3023bc803012656cf45749960282351efc8020 (patch)
tree979feef511fde3dbe564e5362e89a2e8b793909e /ldso/include/tlsdeschtab.h
parent51f9b66d2fee1c7c1088b548751ac64131220b6e (diff)
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>
Diffstat (limited to 'ldso/include/tlsdeschtab.h')
-rw-r--r--ldso/include/tlsdeschtab.h119
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