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Diffstat (limited to 'src/rtld/dl-lookup.c')
| -rw-r--r-- | src/rtld/dl-lookup.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/rtld/dl-lookup.c b/src/rtld/dl-lookup.c new file mode 100644 index 0000000..6688966 --- /dev/null +++ b/src/rtld/dl-lookup.c @@ -0,0 +1,131 @@ +/* glibc-2.22: elf/dl-lookup.c */ + +/* Look up a symbol in the loaded objects. + Copyright (C) 1995-2015 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/>. */ + +/* This file is based on the original eglibc-2.13 libc/elf/dl-lookup.c + code. + + It has been split into two pieces dl-lookup.c and dl-lookupX.c, + the purpose of the split is to enable both 32-bit and 64-bit ELF + processing in the same application. This file contains the ELF + size neutral routines. + */ + +#include <config.h> +#include <alloca.h> +#include <libintl.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <dl-hash.h> + +#include <assert.h> + +#include <errno.h> + +#include <elf.h> + +#include <inttypes.h> + +#include "prelinktab.h" +#include "reloc.h" + +#include "rtld.h" + +/* Return nonzero if check_match should consider SYM to fail to match a + symbol reference for some machine-specific reason. */ +#ifndef ELF_MACHINE_SYM_NO_MATCH +/* glibc-2.20: sysdeps/mips/dl-machine.h */ +/* The semantics of zero/non-zero values of undefined symbols differs + depending on whether the non-PIC ABI is in use. Under the non-PIC + ABI, a non-zero value indicates that there is an address reference + to the symbol and thus it must always be resolved (except when + resolving a jump slot relocation) to the PLT entry whose address is + provided as the symbol's value; a zero value indicates that this + canonical-address behaviour is not required. Yet under the classic + MIPS psABI, a zero value indicates that there is an address + reference to the function and the dynamic linker must resolve the + symbol immediately upon loading. To avoid conflict, symbols for + which the dynamic linker must assume the non-PIC ABI semantics are + marked with the STO_MIPS_PLT flag. */ +#define ELF_MACHINE_SYM_NO_MATCH(sym) \ + (map->machine == EM_MIPS && \ + ((sym)->st_shndx == SHN_UNDEF && !((sym)->st_other & STO_MIPS_PLT)) \ + ) +#endif + +struct unique_sym_table * _ns_unique_sym_table = NULL; + +/* This file is from eglibc 2.13, libc/elf/dl-lookup.c + It has been split into two pieces dl-lookup.c and dl-lookupX.c, + the purpose of the split is to enable both 32-bit and 64-bit ELF + processing in the same application. This file contains the common + routines ... and is the entry to the overall set of files. + */ + +#define make_string(string, rest...) \ + ({ \ + const char *all[] = { string, ## rest }; \ + size_t len, cnt; \ + char *result, *cp; \ + \ + len = 1; \ + for (cnt = 0; cnt < sizeof (all) / sizeof (all[0]); ++cnt) \ + len += strlen (all[cnt]); \ + \ + cp = result = alloca (len); \ + for (cnt = 0; cnt < sizeof (all) / sizeof (all[0]); ++cnt) \ + cp = __stpcpy (cp, all[cnt]); \ + \ + result; \ + }) + +static uint_fast32_t +dl_new_hash (const char *s) +{ + uint_fast32_t h = 5381; + unsigned char c = *s; + for (c = *s; c != '\0'; c = *++s) + h = h * 33 + c; + return h & 0xffffffff; +} + +#undef RTLD_ELF_SIZE +#define RTLD_ELF_SIZE 32 +#include "dl-lookupX.h" + +#undef RTLD_ELF_SIZE +#define RTLD_ELF_SIZE 64 +#include "dl-lookupX.h" + +#undef RTLD_ELF_SIZE + +void +_dl_setup_hash (struct link_map *map) +{ + if (map) + { + if (map->elfclass == ELFCLASS32) + rtld_setup_hash32(map); + else if (map->elfclass == ELFCLASS64) + rtld_setup_hash64(map); + else + _dl_signal_error(EINVAL, map->l_name, NULL, "elfclass is not defined 32-bit or 64-bit!"); + } +} |