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authorAustin Foxley <austinf@cetoncorp.com>2009-09-19 10:11:14 -0700
committerAustin Foxley <austinf@cetoncorp.com>2009-09-26 09:37:43 -0700
commit16598d8539a1c0f775f7258f68f0a44bb8f251e8 (patch)
treebb8715eae2c38a39a4c84b7116002187f0b931e2 /libc/misc/elf
parentaab4df0fb51660300559f5f29290709db2f7bfee (diff)
dl-support.c: add tls support
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
Diffstat (limited to 'libc/misc/elf')
-rw-r--r--libc/misc/elf/dl-support.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/libc/misc/elf/dl-support.c b/libc/misc/elf/dl-support.c
index 4dd155edc..3f5248128 100644
--- a/libc/misc/elf/dl-support.c
+++ b/libc/misc/elf/dl-support.c
@@ -13,6 +13,18 @@
#include <link.h>
#include <elf.h>
+#if USE_TLS
+#include <assert.h>
+#include <tls.h>
+#include <ldsodefs.h>
+#include <string.h>
+#endif
+
+#if USE_TLS
+
+void (*_dl_init_static_tls) (struct link_map *) = &_dl_nothread_init_static_tls;
+
+#endif
ElfW(Phdr) *_dl_phdr;
size_t _dl_phnum;
@@ -26,3 +38,33 @@ void internal_function _dl_aux_init (ElfW(auxv_t) *av)
/* Get the number of program headers from the aux vect */
_dl_phnum = (size_t) av[AT_PHNUM].a_un.a_val;
}
+
+#if USE_TLS
+/* Initialize static TLS area and DTV for current (only) thread.
+ libpthread implementations should provide their own hook
+ to handle all threads. */
+void
+internal_function
+_dl_nothread_init_static_tls (struct link_map *map)
+{
+# if defined(TLS_TCB_AT_TP)
+ void *dest = (char *) THREAD_SELF - map->l_tls_offset;
+# elif defined(TLS_DTV_AT_TP)
+ void *dest = (char *) THREAD_SELF + map->l_tls_offset + TLS_PRE_TCB_SIZE;
+# else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
+# endif
+
+ /* Fill in the DTV slot so that a later LD/GD access will find it. */
+ dtv_t *dtv = THREAD_DTV ();
+ assert (map->l_tls_modid <= dtv[-1].counter);
+ dtv[map->l_tls_modid].pointer.val = dest;
+ dtv[map->l_tls_modid].pointer.is_static = true;
+
+ /* Initialize the memory. */
+ memset (mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
+ '\0', map->l_tls_blocksize - map->l_tls_initimage_size);
+}
+
+#endif
+