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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* Dummy audit library for test-audit-threads.
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Copyright (C) 2018-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <elf.h>
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#include <link.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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/* We must use a dummy LD_AUDIT module to force the dynamic loader to
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*not* update the real PLT, and instead use a cached value for the
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lazy resolution result. It is the update of that cached value that
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we are testing for correctness by doing this. */
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/* Library to be audited. */
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#define LIB "tst-audit-threads-mod2.so"
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/* CALLNUM is the number of retNum functions. */
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#define CALLNUM 7999
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#define CONCATX(a, b) __CONCAT (a, b)
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static int previous = 0;
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unsigned int
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la_version (unsigned int ver)
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{
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return 1;
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}
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unsigned int
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la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
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{
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return LA_FLG_BINDTO | LA_FLG_BINDFROM;
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}
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uintptr_t
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CONCATX(la_symbind, __ELF_NATIVE_CLASS) (ElfW(Sym) *sym,
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unsigned int ndx,
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uintptr_t *refcook,
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uintptr_t *defcook,
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unsigned int *flags,
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const char *symname)
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{
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const char * retnum = "retNum";
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char * num = strstr (symname, retnum);
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int n;
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/* Validate if the symbols are getting called in the correct order.
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This code is here to verify binutils does not optimize out the PLT
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entries that require the symbol binding. */
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if (num != NULL)
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{
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n = atoi (num);
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assert (n >= previous);
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assert (n <= CALLNUM);
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previous = n;
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}
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return sym->st_value;
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}
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