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authorUlrich Drepper <drepper@redhat.com>2002-02-13 08:03:56 +0000
committerUlrich Drepper <drepper@redhat.com>2002-02-13 08:03:56 +0000
commitaed283dd456e7566cbfef88abe7b235ca77cc23c (patch)
tree39e854a8a182adce9cc8876c27a0a1d8b07d878e /elf/dl-open.c
parent712ac5b11c3f250c4354d92ee5a902c67b6d2045 (diff)
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Update.
2002-02-12 Ulrich Drepper <drepper@redhat.com> * sysdeps/generic/dl-tls.c (TLS_DTV_UNALLOCATED): Renamed from TLS_DTV_UNALLOCATE. (oom): New function. (_dl_next_tls_modid): Rewrite to handle dl_tls_dtv_slotinfo_list. (_dl_determine_tlsoffset): Likewise. (_dl_allocate_tls): Likewise. (__TLS_GET_ADDR): Define if not already defined. (_dl_tls_symaddr): New function. (allocate_and_init): New function. (__tls_get_addr): Actually implement handling of generation counter and deferred allocation. * sysdeps/generic/ldsodefs.h (_rtld_global): Remove _dl_initimage_list, add _dl_tls_dtv_slotinfo_list, _dl_tls_static_nelem, and _dl_tls_generation. Define TLS_SLOTINFO_SURPLUS and DTV_SURPLUS. Declare _dl_tls_symaddr. * sysdeps/i386/dl-tls.h: Disable __tls_get_addr handling unless SHARED. * include/link.h (struct link_map): Remove l_tls_nextimage and l_tls_previmage. * elf/dl-sym.c (_dl_sym): After successful lookup call _dl_tls_symaddr instead of DL_SYMBOL_ADDRESS for STT_TLS symbols. (_dl_vsym): Likewise. * elf/rtld.c (_dl_start_final): Adjust initdtv initialization for new layout. (dl_main): Allow PT_TLS be present for empty segment. Remove nextimage list handling. Instead add all modules using TLS to dl_tls_dtv_slotinfo_list. * elf/dl-open.c (dl_open_worker): After successfully loading all objects add those with TLS to the dl_tls_dtv_slotinfo_list list. * elf/dl-load.c (_dl_map_object_from_fd): If PT_TLS entry is for an empty segment don't do anything. Remove handling of initimage list. * elf/Versions [ld] (GLIBC_2.0): Add __libc_memalign. (GLIBC_PRIVATE): Add _dl_tls_symaddr. * elf/dl-minimal.c: Define __libc_memalign. * elf/dl-support.c: Remove _dl_initimage_list. Add _dl_tls_dtv_slotinfo_list, _dl_tls_static_nelem, and _dl_tls_generation. * include/stdlib.h: Declare __libc_memalign. * elf/Makefile: Add rules to build and run tst-tls4 and tst-tls5. * elf/tst-tls4.c: New file. * elf/tst-tls5.c: New file. * elf/tst-tlsmod2.c: New file. * elf/tls-macros.h: asms using ___tls_get_addr destroy %ecx and %edx. * elf/tst-tlsmod1.c: Don't define variables unles USE_TLS. * elf/tst-tls1.c: Use test-skeleton.c. * elf/tst-tls2.c: Likewise. * elf/tst-tls3.c: Likewise. * elf/dl-conflict.c (RESOLVE_MAP): Return NULL not 0. * sysdeps/mips/machine-gmon.h: Update MCOUNT for current GCC behavior.
Diffstat (limited to 'elf/dl-open.c')
-rw-r--r--elf/dl-open.c84
1 files changed, 80 insertions, 4 deletions
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 8f30bc0..d9ed499 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -31,6 +31,7 @@
#include <bp-sym.h>
#include <dl-dst.h>
+#include <dl-tls.h>
extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
@@ -353,6 +354,73 @@ dl_open_worker (void *a)
imap->l_scope[cnt++] = &new->l_searchlist;
imap->l_scope[cnt] = NULL;
}
+#if USE_TLS
+ else if (new->l_searchlist.r_list[i]->l_opencount == 1
+ /* Only if the module defines thread local data. */
+ && __builtin_expect (new->l_searchlist.r_list[i]->l_tls_blocksize
+ > 0, 0))
+ {
+ /* Now that we know the object is loaded successfully add
+ modules containing TLS data to the dtv info table. We
+ might have to increase its size. */
+ struct dtv_slotinfo_list *listp;
+ struct dtv_slotinfo_list *prevp;
+ size_t idx = new->l_searchlist.r_list[i]->l_tls_modid;
+
+ assert (new->l_searchlist.r_list[i]->l_type == lt_loaded);
+
+ /* Find the place in the stv slotinfo list. */
+ listp = GL(dl_tls_dtv_slotinfo_list);
+ prevp = NULL; /* Needed to shut up gcc. */
+ do
+ {
+ /* Does it fit in the array of this list element? */
+ if (idx <= listp->len)
+ break;
+ prevp = listp;
+ }
+ while ((listp = listp->next) != NULL);
+
+ if (listp == NULL)
+ {
+ /* When we come here it means we have to add a new element
+ to the slotinfo list. And the new module must be in
+ the first slot. */
+ assert (idx == 0);
+
+ listp = prevp->next = (struct dtv_slotinfo_list *)
+ malloc (sizeof (struct dtv_slotinfo_list)
+ + TLS_SLOTINFO_SURPLUS * sizeof (struct dtv_slotinfo));
+ if (listp == NULL)
+ {
+ /* We ran out of memory. We will simply fail this
+ call but don't undo anything we did so far. The
+ application will crash or be terminated anyway very
+ soon. */
+
+ /* We have to do this since some entries in the dtv
+ slotinfo array might already point to this
+ generation. */
+ ++GL(dl_tls_generation);
+
+ _dl_signal_error (ENOMEM, "dlopen", NULL,
+ N_("cannot create TLS data structures"));
+ }
+
+ listp->len = TLS_SLOTINFO_SURPLUS;
+ listp->next = NULL;
+ memset (listp->slotinfo, '\0',
+ TLS_SLOTINFO_SURPLUS * sizeof (struct dtv_slotinfo));
+ }
+
+ /* Add the information into the slotinfo data structure. */
+ listp->slotinfo[idx].map = new->l_searchlist.r_list[i];
+ listp->slotinfo[idx].gen = GL(dl_tls_generation) + 1;
+ }
+
+ /* Bump the generation number. */
+ ++GL(dl_tls_generation);
+#endif
/* Run the initializer functions of new objects. */
_dl_init (new, __libc_argc, __libc_argv, __environ);
@@ -424,10 +492,18 @@ _dl_open (const char *file, int mode, const void *caller)
{
unsigned int i;
- /* Increment open counters for all objects since this has
- not happened yet. */
- for (i = 0; i < args.map->l_searchlist.r_nlist; ++i)
- ++args.map->l_searchlist.r_list[i]->l_opencount;
+ /* Increment open counters for all objects since this
+ sometimes has not happened yet. */
+ if (args.map->l_searchlist.r_list[0]->l_opencount == 0)
+ for (i = 0; i < args.map->l_searchlist.r_nlist; ++i)
+ ++args.map->l_searchlist.r_list[i]->l_opencount;
+
+ /* Maybe some of the modules which were loaded uses TLS.
+ Since it will be removed in the folowing _dl_close call
+ we have to mark the dtv array as having gaps to fill
+ the holes. This is a pessimistic assumption which won't
+ hurt if not true. */
+ GL(dl_tls_dtv_gaps) = true;
_dl_close (args.map);
}