1  /* Partial initialization of ld.so loaded via static dlopen.
       2     Copyright (C) 2021-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <assert.h>
      20  
      21  /* Very special case: This object is built into the static libc, but
      22     must know the layout of _rtld_global_ro.  */
      23  #define SHARED
      24  #include <ldsodefs.h>
      25  
      26  #include <rtld_static_init.h>
      27  
      28  static const struct dlfcn_hook _dlfcn_hook =
      29    {
      30      .dlopen = __dlopen,
      31      .dlclose = __dlclose,
      32      .dlsym = __dlsym,
      33      .dlvsym = __dlvsym,
      34      .dlerror = __dlerror,
      35      .dladdr = __dladdr,
      36      .dladdr1 = __dladdr1,
      37      .dlinfo = __dlinfo,
      38      .dlmopen = __dlmopen,
      39      .libc_dlopen_mode = __libc_dlopen_mode,
      40      .libc_dlsym = __libc_dlsym,
      41      .libc_dlvsym = __libc_dlvsym,
      42      .libc_dlclose = __libc_dlclose,
      43    };
      44  
      45  void
      46  __rtld_static_init (struct link_map *map)
      47  {
      48    const ElfW(Sym) *sym
      49      = _dl_lookup_direct (map, "_rtld_global_ro",
      50                           0x9f28436a, /* dl_new_hash output.  */
      51                           "GLIBC_PRIVATE",
      52                           0x0963cf85); /* _dl_elf_hash output.  */
      53    assert (sym != NULL);
      54    struct rtld_global_ro *dl = DL_SYMBOL_ADDRESS (map, sym);
      55  
      56    /* Perform partial initialization here.  Note that this runs before
      57       ld.so is relocated, so only members initialized without
      58       relocations can be written here.  */
      59  #ifdef HAVE_AUX_VECTOR
      60    extern __typeof (dl->_dl_auxv) _dl_auxv attribute_hidden;
      61    dl->_dl_auxv = _dl_auxv;
      62    extern __typeof (dl->_dl_clktck) _dl_clktck attribute_hidden;
      63    dl->_dl_clktck = _dl_clktck;
      64  #endif
      65    dl->_dl_dlfcn_hook = &_dlfcn_hook;
      66    extern __typeof (dl->_dl_hwcap) _dl_hwcap attribute_hidden;
      67    dl->_dl_hwcap = _dl_hwcap;
      68    extern __typeof (dl->_dl_hwcap2) _dl_hwcap2 attribute_hidden;
      69    dl->_dl_hwcap2 = _dl_hwcap2;
      70    extern __typeof (dl->_dl_minsigstacksize) _dl_minsigstacksize
      71      attribute_hidden;
      72    dl->_dl_minsigstacksize = _dl_minsigstacksize;
      73    extern __typeof (dl->_dl_pagesize) _dl_pagesize attribute_hidden;
      74    dl->_dl_pagesize = _dl_pagesize;
      75    extern __typeof (dl->_dl_tls_static_align) _dl_tls_static_align
      76      attribute_hidden;
      77    dl->_dl_tls_static_align = _dl_tls_static_align;
      78    extern __typeof (dl->_dl_tls_static_size) _dl_tls_static_size
      79      attribute_hidden;
      80    dl->_dl_tls_static_size = _dl_tls_static_size;
      81    dl->_dl_find_object = _dl_find_object;
      82  
      83    __rtld_static_init_arch (map, dl);
      84  }