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83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* Configuration of lookup functions.
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Copyright (C) 2000-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#define ELF_FUNCTION_PTR_IS_SPECIAL
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#define DL_UNMAP_IS_SPECIAL
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#include <dl-fptr.h>
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/* Forward declaration. */
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struct link_map;
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void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref);
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#define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
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Elf32_Addr _dl_lookup_address (const void *address);
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/* Clear the bottom two bits so generic code can find the fdesc entry */
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#define DL_LOOKUP_ADDRESS(addr) \
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(_dl_lookup_address ((void *)((unsigned long)addr & ~3)))
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void _dl_unmap (struct link_map *map);
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#define DL_UNMAP(map) _dl_unmap (map)
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#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
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attr volatile unsigned int fptr[2]; \
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/* The test for "start & 2" below is to accommodate old binaries which \
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violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \
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descriptor. */ \
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if ((ElfW(Addr)) (start) & 2) \
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addr = (ElfW(Addr)) start; \
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else \
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{ \
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fptr[0] = (unsigned int) (start); \
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fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
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/* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
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addr = (ElfW(Addr))((unsigned int)fptr | 2); \
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} \
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#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
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{ \
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ElfW(Addr) addr; \
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DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
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init_t init = (init_t) addr; \
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init (argc, argv, env); \
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}
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#define DL_CALL_DT_FINI(map, start) \
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{ \
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ElfW(Addr) addr; \
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DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
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fini_t fini = (fini_t) addr; \
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fini (); \
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}
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/* The type of the return value of fixup/profile_fixup */
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#define DL_FIXUP_VALUE_TYPE struct fdesc
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/* Construct a fixup value from the address and linkmap */
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#define DL_FIXUP_MAKE_VALUE(map, addr) \
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((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr })
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/* Extract the code address from a fixup value */
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#define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
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#define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
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#define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))
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