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Diffstat (limited to 'sysdeps/generic/dl-cache.c')
| -rw-r--r-- | sysdeps/generic/dl-cache.c | 311 |
1 files changed, 0 insertions, 311 deletions
diff --git a/sysdeps/generic/dl-cache.c b/sysdeps/generic/dl-cache.c deleted file mode 100644 index 29886e194a..0000000000 --- a/sysdeps/generic/dl-cache.c +++ /dev/null @@ -1,311 +0,0 @@ -/* Support for reading /etc/ld.so.cache files written by Linux ldconfig. - Copyright (C) 1996-2002, 2003, 2004 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <assert.h> -#include <unistd.h> -#include <ldsodefs.h> -#include <sys/mman.h> -#include <dl-cache.h> -#include <dl-procinfo.h> - -#include <stdio-common/_itoa.h> - -#ifndef _DL_PLATFORMS_COUNT -# define _DL_PLATFORMS_COUNT 0 -#endif - -/* This is the starting address and the size of the mmap()ed file. */ -static struct cache_file *cache; -static struct cache_file_new *cache_new; -static size_t cachesize; - -/* 1 if cache_data + PTR points into the cache. */ -#define _dl_cache_verify_ptr(ptr) (ptr < cache_data_size) - -#define SEARCH_CACHE(cache) \ -/* We use binary search since the table is sorted in the cache file. \ - The first matching entry in the table is returned. \ - It is important to use the same algorithm as used while generating \ - the cache file. */ \ -do \ - { \ - left = 0; \ - right = cache->nlibs - 1; \ - \ - while (left <= right) \ - { \ - __typeof__ (cache->libs[0].key) key; \ - \ - middle = (left + right) / 2; \ - \ - key = cache->libs[middle].key; \ - \ - /* Make sure string table indices are not bogus before using \ - them. */ \ - if (! _dl_cache_verify_ptr (key)) \ - { \ - cmpres = 1; \ - break; \ - } \ - \ - /* Actually compare the entry with the key. */ \ - cmpres = _dl_cache_libcmp (name, cache_data + key); \ - if (__builtin_expect (cmpres == 0, 0)) \ - { \ - /* Found it. LEFT now marks the last entry for which we \ - know the name is correct. */ \ - left = middle; \ - \ - /* There might be entries with this name before the one we \ - found. So we have to find the beginning. */ \ - while (middle > 0) \ - { \ - __typeof__ (cache->libs[0].key) key; \ - \ - key = cache->libs[middle - 1].key; \ - /* Make sure string table indices are not bogus before \ - using them. */ \ - if (! _dl_cache_verify_ptr (key) \ - /* Actually compare the entry. */ \ - || _dl_cache_libcmp (name, cache_data + key) != 0) \ - break; \ - --middle; \ - } \ - \ - do \ - { \ - int flags; \ - __typeof__ (cache->libs[0]) *lib = &cache->libs[middle]; \ - \ - /* Only perform the name test if necessary. */ \ - if (middle > left \ - /* We haven't seen this string so far. Test whether the \ - index is ok and whether the name matches. Otherwise \ - we are done. */ \ - && (! _dl_cache_verify_ptr (lib->key) \ - || (_dl_cache_libcmp (name, cache_data + lib->key) \ - != 0))) \ - break; \ - \ - flags = lib->flags; \ - if (_dl_cache_check_flags (flags) \ - && _dl_cache_verify_ptr (lib->value)) \ - { \ - if (best == NULL || flags == GLRO(dl_correct_cache_id)) \ - { \ - HWCAP_CHECK; \ - best = cache_data + lib->value; \ - \ - if (flags == GLRO(dl_correct_cache_id)) \ - /* We've found an exact match for the shared \ - object and no general `ELF' release. Stop \ - searching. */ \ - break; \ - } \ - } \ - } \ - while (++middle <= right); \ - break; \ - } \ - \ - if (cmpres < 0) \ - left = middle + 1; \ - else \ - right = middle - 1; \ - } \ - } \ -while (0) - - -int -internal_function -_dl_cache_libcmp (const char *p1, const char *p2) -{ - while (*p1 != '\0') - { - if (*p1 >= '0' && *p1 <= '9') - { - if (*p2 >= '0' && *p2 <= '9') - { - /* Must compare this numerically. */ - int val1; - int val2; - - val1 = *p1++ - '0'; - val2 = *p2++ - '0'; - while (*p1 >= '0' && *p1 <= '9') - val1 = val1 * 10 + *p1++ - '0'; - while (*p2 >= '0' && *p2 <= '9') - val2 = val2 * 10 + *p2++ - '0'; - if (val1 != val2) - return val1 - val2; - } - else - return 1; - } - else if (*p2 >= '0' && *p2 <= '9') - return -1; - else if (*p1 != *p2) - return *p1 - *p2; - else - { - ++p1; - ++p2; - } - } - return *p1 - *p2; -} - - -/* Look up NAME in ld.so.cache and return the file name stored there, - or null if none is found. */ - -const char * -internal_function -_dl_load_cache_lookup (const char *name) -{ - int left, right, middle; - int cmpres; - const char *cache_data; - uint32_t cache_data_size; - const char *best; - - /* Print a message if the loading of libs is traced. */ - if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0)) - _dl_debug_printf (" search cache=%s\n", LD_SO_CACHE); - - if (cache == NULL) - { - /* Read the contents of the file. */ - void *file = _dl_sysdep_read_whole_file (LD_SO_CACHE, &cachesize, - PROT_READ); - - /* We can handle three different cache file formats here: - - the old libc5/glibc2.0/2.1 format - - the old format with the new format in it - - only the new format - The following checks if the cache contains any of these formats. */ - if (file != MAP_FAILED && cachesize > sizeof *cache - && memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1) == 0) - { - size_t offset; - /* Looks ok. */ - cache = file; - - /* Check for new version. */ - offset = ALIGN_CACHE (sizeof (struct cache_file) - + cache->nlibs * sizeof (struct file_entry)); - - cache_new = (struct cache_file_new *) ((void *) cache + offset); - if (cachesize < (offset + sizeof (struct cache_file_new)) - || memcmp (cache_new->magic, CACHEMAGIC_VERSION_NEW, - sizeof CACHEMAGIC_VERSION_NEW - 1) != 0) - cache_new = (void *) -1; - } - else if (file != MAP_FAILED && cachesize > sizeof *cache_new - && memcmp (file, CACHEMAGIC_VERSION_NEW, - sizeof CACHEMAGIC_VERSION_NEW - 1) == 0) - { - cache_new = file; - cache = file; - } - else - { - if (file != MAP_FAILED) - __munmap (file, cachesize); - cache = (void *) -1; - } - - assert (cache != NULL); - } - - if (cache == (void *) -1) - /* Previously looked for the cache file and didn't find it. */ - return NULL; - - best = NULL; - - if (cache_new != (void *) -1) - { - uint64_t platform; - - /* This is where the strings start. */ - cache_data = (const char *) cache_new; - - /* Now we can compute how large the string table is. */ - cache_data_size = (const char *) cache + cachesize - cache_data; - - platform = _dl_string_platform (GLRO(dl_platform)); - if (platform != (uint64_t) -1) - platform = 1ULL << platform; - - /* Only accept hwcap if it's for the right platform. */ -#ifdef USE_TLS -# define _DL_HWCAP_TLS_MASK (1LL << 63) -#else -# define _DL_HWCAP_TLS_MASK 0 -#endif -#define HWCAP_CHECK \ - if (GLRO(dl_osversion) && lib->osversion > GLRO(dl_osversion)) \ - continue; \ - if (_DL_PLATFORMS_COUNT && platform != -1 \ - && (lib->hwcap & _DL_HWCAP_PLATFORM) != 0 \ - && (lib->hwcap & _DL_HWCAP_PLATFORM) != platform) \ - continue; \ - if (lib->hwcap \ - & ~(GLRO(dl_hwcap) | _DL_HWCAP_PLATFORM | _DL_HWCAP_TLS_MASK)) \ - continue - SEARCH_CACHE (cache_new); - } - else - { - /* This is where the strings start. */ - cache_data = (const char *) &cache->libs[cache->nlibs]; - - /* Now we can compute how large the string table is. */ - cache_data_size = (const char *) cache + cachesize - cache_data; - -#undef HWCAP_CHECK -#define HWCAP_CHECK do {} while (0) - SEARCH_CACHE (cache); - } - - /* Print our result if wanted. */ - if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0) - && best != NULL) - _dl_debug_printf (" trying file=%s\n", best); - - return best; -} - -#ifndef MAP_COPY -/* If the system does not support MAP_COPY we cannot leave the file open - all the time since this would create problems when the file is replaced. - Therefore we provide this function to close the file and open it again - once needed. */ -void -_dl_unload_cache (void) -{ - if (cache != NULL && cache != (struct cache_file *) -1) - { - __munmap (cache, cachesize); - cache = NULL; - } -} -#endif |