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authorUlrich Drepper <drepper@redhat.com>2006-10-10 00:51:29 +0000
committerUlrich Drepper <drepper@redhat.com>2006-10-10 00:51:29 +0000
commit1100f84983f22e570a5081cbe79b0ef8fe4952d7 (patch)
tree3472df1372abf7816fb10f02573ba114c5b5a003 /elf/dl-runtime.c
parent7484f797e4d4f9c174d4391f59d208e83027b285 (diff)
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Jakub Jelinek <jakub@redhat.com>
Implement reference counting of scope records. * elf/dl-close.c (_dl_close): Remove all scopes from removed objects from the list in objects which remain. Always allocate new scope record. * elf/dl-open.c (dl_open_worker): When growing array for scopes, don't resize, allocate a new one. * elf/dl-runtime.c: Update reference counters before using a scope array. * elf/dl-sym.c: Likewise. * elf/dl-libc.c: Adjust for l_scope name change. * elf/dl-load.c: Likewise. * elf/dl-object.c: Likewise. * elf/rtld.c: Likewise. * include/link.h: Inlcude <rtld-lowlevel.h>. Define struct r_scoperec. Replace r_scope with pointer to r_scoperec structure. Add l_scoperec_lock. * sysdeps/generic/ldsodefs.h: Include <rtld-lowlevel.h>. * sysdeps/generic/rtld-lowlevel.h: New file. * include/atomic.h: Rename atomic_and to atomic_and_val and atomic_or to atomic_or_val. Define new macros atomic_and and atomic_or which do not return values. * sysdeps/x86_64/bits/atomic.h: Define atomic_and and atomic_or. Various cleanups. * sysdeps/i386/i486/bits/atomic.h: Likewise.
Diffstat (limited to 'elf/dl-runtime.c')
-rw-r--r--elf/dl-runtime.c49
1 files changed, 44 insertions, 5 deletions
diff --git a/elf/dl-runtime.c b/elf/dl-runtime.c
index f92cbe2..83d565a 100644
--- a/elf/dl-runtime.c
+++ b/elf/dl-runtime.c
@@ -1,5 +1,5 @@
/* On-demand PLT fixup for shared objects.
- Copyright (C) 1995-2002,2003,2004,2005 Free Software Foundation, Inc.
+ Copyright (C) 1995-2002,2003,2004,2005,2006 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
@@ -92,16 +92,36 @@ _dl_fixup (
version = NULL;
}
+ struct r_scoperec *scoperec = l->l_scoperec;
+ if (l->l_type == lt_loaded)
+ {
+ __rtld_mrlock_lock (l->l_scoperec_lock);
+ scoperec = l->l_scoperec;
+ atomic_increment (&scoperec->nusers);
+ __rtld_mrlock_unlock (l->l_scoperec_lock);
+ }
+
result = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym,
- l->l_scope, version, ELF_RTYPE_CLASS_PLT,
+ scoperec->scope, version,
+ ELF_RTYPE_CLASS_PLT,
DL_LOOKUP_ADD_DEPENDENCY, NULL);
+ if (l->l_type == lt_loaded
+ && atomic_decrement_val (&scoperec->nusers) == 0
+ && __builtin_expect (scoperec->remove_after_use, 0))
+ {
+ if (scoperec->notify)
+ __rtld_notify (scoperec->nusers);
+ else
+ free (scoperec);
+ }
+
/* Currently result contains the base load address (or link map)
of the object that defines sym. Now add in the symbol
offset. */
value = DL_FIXUP_MAKE_VALUE (result,
- sym ? LOOKUP_VALUE_ADDRESS (result)
- + sym->st_value : 0);
+ sym ? (LOOKUP_VALUE_ADDRESS (result)
+ + sym->st_value) : 0);
}
else
{
@@ -174,11 +194,30 @@ _dl_profile_fixup (
version = NULL;
}
+ struct r_scoperec *scoperec = l->l_scoperec;
+ if (l->l_type == lt_loaded)
+ {
+ __rtld_mrlock_lock (l->l_scoperec_lock);
+ scoperec = l->l_scoperec;
+ atomic_increment (&scoperec->nusers);
+ __rtld_mrlock_unlock (l->l_scoperec_lock);
+ }
+
result = _dl_lookup_symbol_x (strtab + refsym->st_name, l, &defsym,
- l->l_scope, version,
+ scoperec->scope, version,
ELF_RTYPE_CLASS_PLT,
DL_LOOKUP_ADD_DEPENDENCY, NULL);
+ if (l->l_type == lt_loaded
+ && atomic_decrement_val (&scoperec->nusers) == 0
+ && __builtin_expect (scoperec->remove_after_use, 0))
+ {
+ if (scoperec->notify)
+ __rtld_notify (scoperec->nusers);
+ else
+ free (scoperec);
+ }
+
/* Currently result contains the base load address (or link map)
of the object that defines sym. Now add in the symbol
offset. */