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We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/* Hash table for TLS descriptors.
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Copyright (C) 2005-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef TLSDESCHTAB_H
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# define TLSDESCHTAB_H 1
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#include <atomic.h>
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# ifdef SHARED
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# include <inline-hashtab.h>
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inline static int
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hash_tlsdesc (void *p)
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{
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struct tlsdesc_dynamic_arg *td = p;
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/* We know all entries are for the same module, so ti_offset is the
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only distinguishing entry. */
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return td->tlsinfo.ti_offset;
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}
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inline static int
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eq_tlsdesc (void *p, void *q)
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{
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struct tlsdesc_dynamic_arg *tdp = p, *tdq = q;
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return tdp->tlsinfo.ti_offset == tdq->tlsinfo.ti_offset;
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}
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inline static size_t
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map_generation (struct link_map *map)
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{
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size_t idx = map->l_tls_modid;
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struct dtv_slotinfo_list *listp = GL(dl_tls_dtv_slotinfo_list);
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/* Find the place in the dtv slotinfo list. */
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do
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{
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/* Does it fit in the array of this list element? */
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if (idx < listp->len)
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{
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/* We should never get here for a module in static TLS, so
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we can assume that, if the generation count is zero, we
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still haven't determined the generation count for this
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module. */
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if (listp->slotinfo[idx].map == map && listp->slotinfo[idx].gen)
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return listp->slotinfo[idx].gen;
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else
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break;
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}
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idx -= listp->len;
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listp = listp->next;
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}
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while (listp != NULL);
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/* If we get to this point, the module still hasn't been assigned an
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entry in the dtv slotinfo data structures, and it will when we're
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done with relocations. At that point, the module will get a
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generation number that is one past the current generation, so
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return exactly that. */
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return GL(dl_tls_generation) + 1;
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}
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/* Returns the data pointer for a given map and tls offset that is used
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to fill in one of the GOT entries referenced by a TLSDESC relocation
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when using dynamic TLS. This requires allocation, returns NULL on
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allocation failure. */
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void *
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_dl_make_tlsdesc_dynamic (struct link_map *map, size_t ti_offset)
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{
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struct hashtab *ht;
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void **entry;
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struct tlsdesc_dynamic_arg *td, test;
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ht = map->l_mach.tlsdesc_table;
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if (! ht)
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{
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ht = htab_create ();
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if (! ht)
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return 0;
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map->l_mach.tlsdesc_table = ht;
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}
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test.tlsinfo.ti_module = map->l_tls_modid;
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test.tlsinfo.ti_offset = ti_offset;
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entry = htab_find_slot (ht, &test, 1, hash_tlsdesc, eq_tlsdesc);
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if (! entry)
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return 0;
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if (*entry)
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{
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td = *entry;
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return td;
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}
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*entry = td = malloc (sizeof (struct tlsdesc_dynamic_arg));
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/* This may be higher than the map's generation, but it doesn't
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matter much. Worst case, we'll have one extra DTV update per
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thread. */
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td->gen_count = map_generation (map);
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td->tlsinfo = test.tlsinfo;
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return td;
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}
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# endif /* SHARED */
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#endif
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