/* glibc-2.23: elf/dl-lookup.c */
/* Look up a symbol in the loaded objects.
Copyright (C) 1995-2016 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
. */
/* 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
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#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-2.23: 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!");
}
}