/* * Support for dynamic linking code in static libc. * Copyright (C) 1996-2002, 2003, 2004, 2005 Free Software Foundation, Inc. * * Partially based on GNU C Library (file: libc/elf/dl-support.c) * * Copyright (C) 2008 STMicroelectronics Ltd. * Author: Carmelo Amoroso <carmelo.amoroso@st.com> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. * */ #include <link.h> #include <elf.h> #if defined(USE_TLS) && USE_TLS #include <assert.h> #include <tls.h> #include <ldsodefs.h> #include <string.h> #endif #include <bits/uClibc_page.h> #if defined(USE_TLS) && USE_TLS void (*_dl_init_static_tls) (struct link_map *) = &_dl_nothread_init_static_tls; #endif ElfW(Phdr) *_dl_phdr; size_t _dl_phnum; size_t _dl_pagesize; void internal_function _dl_aux_init (ElfW(auxv_t) *av); void internal_function _dl_aux_init (ElfW(auxv_t) *av) { /* Get the program headers base address from the aux vect */ _dl_phdr = (ElfW(Phdr) *) av[AT_PHDR].a_un.a_val; /* Get the number of program headers from the aux vect */ _dl_phnum = (size_t) av[AT_PHNUM].a_un.a_val; /* Get the pagesize from the aux vect */ _dl_pagesize = (av[AT_PAGESZ].a_un.a_val) ? (size_t) av[AT_PAGESZ].a_un.a_val : PAGE_SIZE; } #if defined(USE_TLS) && USE_TLS /* Initialize static TLS area and DTV for current (only) thread. libpthread implementations should provide their own hook to handle all threads. */ void attribute_hidden _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