1  /* Dummy audit library for test-audit-threads.
       2  
       3     Copyright (C) 2018-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <elf.h>
      21  #include <link.h>
      22  #include <stdio.h>
      23  #include <assert.h>
      24  #include <string.h>
      25  
      26  /* We must use a dummy LD_AUDIT module to force the dynamic loader to
      27     *not* update the real PLT, and instead use a cached value for the
      28     lazy resolution result.  It is the update of that cached value that
      29     we are testing for correctness by doing this.  */
      30  
      31  /* Library to be audited.  */
      32  #define LIB "tst-audit-threads-mod2.so"
      33  /* CALLNUM is the number of retNum functions.  */
      34  #define CALLNUM 7999
      35  
      36  #define CONCATX(a, b) __CONCAT (a, b)
      37  
      38  static int previous = 0;
      39  
      40  unsigned int
      41  la_version (unsigned int ver)
      42  {
      43    return 1;
      44  }
      45  
      46  unsigned int
      47  la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
      48  {
      49    return LA_FLG_BINDTO | LA_FLG_BINDFROM;
      50  }
      51  
      52  uintptr_t
      53  CONCATX(la_symbind, __ELF_NATIVE_CLASS) (ElfW(Sym) *sym,
      54  					unsigned int ndx,
      55  					uintptr_t *refcook,
      56  					uintptr_t *defcook,
      57  					unsigned int *flags,
      58  					const char *symname)
      59  {
      60    const char * retnum = "retNum";
      61    char * num = strstr (symname, retnum);
      62    int n;
      63    /* Validate if the symbols are getting called in the correct order.
      64       This code is here to verify binutils does not optimize out the PLT
      65       entries that require the symbol binding.  */
      66    if (num != NULL)
      67      {
      68        n = atoi (num);
      69        assert (n >= previous);
      70        assert (n <= CALLNUM);
      71        previous = n;
      72      }
      73    return sym->st_value;
      74  }