diff options
| -rw-r--r-- | libc/misc/elf/dl-support.c | 42 |
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 + |