diff options
Diffstat (limited to 'src/rtld/dl-misc.c')
-rw-r--r-- | src/rtld/dl-misc.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/src/rtld/dl-misc.c b/src/rtld/dl-misc.c new file mode 100644 index 0000000..c70956d --- /dev/null +++ b/src/rtld/dl-misc.c @@ -0,0 +1,106 @@ +/* glibc 2.22, elf/dl-misc.c */ + +/* Miscellaneous support functions for dynamic linker + Copyright (C) 1997-2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <assert.h> +#include <error.h> +#include <errno.h> +#include <string.h> +#include "rtld.h" + +/* Test whether given NAME matches any of the names of the given object. */ +int +_dl_name_match_p (const char *name, const struct link_map *map) +{ + if (strcmp (name, map->l_name) == 0) + return 1; + + struct libname_list *runp = map->l_libname; + + while (runp != NULL) + if (strcmp (name, runp->name) == 0) + return 1; + else + runp = runp->next; + + return 0; +} + +unsigned long int +_dl_higher_prime_number (unsigned long int n) +{ + /* These are primes that are near, but slightly smaller than, a + power of two. */ + static const uint32_t primes[] = { + UINT32_C (7), + UINT32_C (13), + UINT32_C (31), + UINT32_C (61), + UINT32_C (127), + UINT32_C (251), + UINT32_C (509), + UINT32_C (1021), + UINT32_C (2039), + UINT32_C (4093), + UINT32_C (8191), + UINT32_C (16381), + UINT32_C (32749), + UINT32_C (65521), + UINT32_C (131071), + UINT32_C (262139), + UINT32_C (524287), + UINT32_C (1048573), + UINT32_C (2097143), + UINT32_C (4194301), + UINT32_C (8388593), + UINT32_C (16777213), + UINT32_C (33554393), + UINT32_C (67108859), + UINT32_C (134217689), + UINT32_C (268435399), + UINT32_C (536870909), + UINT32_C (1073741789), + UINT32_C (2147483647), + /* 4294967291L */ + UINT32_C (2147483647) + UINT32_C (2147483644) + }; + + const uint32_t *low = &primes[0]; + const uint32_t *high = &primes[sizeof (primes) / sizeof (primes[0])]; + + while (low != high) + { + const uint32_t *mid = low + (high - low) / 2; + if (n > *mid) + low = mid + 1; + else + high = mid; + } + +#if 0 + /* If we've run out of primes, abort. */ + if (n > *low) + { + fprintf (stderr, "Cannot find prime bigger than %lu\n", n); + abort (); + } +#endif + + return *low; +} |