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/* Configuration of lookup functions.
Copyright (C) 2000-2022 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
<https://www.gnu.org/licenses/>. */
#define ELF_FUNCTION_PTR_IS_SPECIAL
#define DL_UNMAP_IS_SPECIAL
#include <dl-fptr.h>
/* Forward declaration. */
struct link_map;
void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref);
rtld_hidden_proto (_dl_symbol_address)
#define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
Elf32_Addr _dl_lookup_address (const void *address);
#define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr)
void attribute_hidden _dl_unmap (struct link_map *map);
#define DL_UNMAP(map) _dl_unmap (map)
#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
attr volatile unsigned int fptr[2]; \
/* The test for "start & 2" below is to accommodate old binaries which \
violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \
descriptor. */ \
if ((ElfW(Addr)) (start) & 2) \
addr = (ElfW(Addr)) start; \
else \
{ \
fptr[0] = (unsigned int) (start); \
fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
/* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
addr = (ElfW(Addr))((unsigned int)fptr | 2); \
} \
#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
dl_init_t init = (dl_init_t) addr; \
init (argc, argv, env); \
}
#define DL_CALL_DT_FINI(map, start) \
{ \
ElfW(Addr) addr; \
DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
fini_t fini = (fini_t) addr; \
fini (); \
}
/* The type of the return value of fixup/profile_fixup */
#define DL_FIXUP_VALUE_TYPE struct fdesc
/* Construct a fixup value from the address and linkmap */
#define DL_FIXUP_MAKE_VALUE(map, addr) \
(map) ? ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) \
: ((struct fdesc) { 0, 0 })
/* Extract the code address from a fixup value */
#define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
#define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
/* Clear the plabel bit to get the actual address of the descriptor. */
#define DL_FIXUP_ADDR_VALUE(addr) \
(*(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (addr) & ~2))
#define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr)
#define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \
*(value) = *(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (new_value) & ~2)
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