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1/* Configuration of lookup functions.
2 Copyright (C) 2000-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19#define ELF_FUNCTION_PTR_IS_SPECIAL
20#define DL_UNMAP_IS_SPECIAL
21
22#include <dl-fptr.h>
23
24/* Forward declaration. */
25struct link_map;
26
27void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref);
28rtld_hidden_proto (_dl_symbol_address)
29
30#define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
31
32Elf32_Addr _dl_lookup_address (const void *address);
33
34#define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr)
35
36void attribute_hidden _dl_unmap (struct link_map *map);
37
38#define DL_UNMAP(map) _dl_unmap (map)
39
40#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
41 attr volatile unsigned int fptr[2]; \
42 /* The test for "start & 2" below is to accommodate old binaries which \
43 violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \
44 descriptor. */ \
45 if ((ElfW(Addr)) (start) & 2) \
46 addr = (ElfW(Addr)) start; \
47 else \
48 { \
49 fptr[0] = (unsigned int) (start); \
50 fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
51 /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \
52 addr = (ElfW(Addr))((unsigned int)fptr | 2); \
53 } \
54
55#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
56{ \
57 ElfW(Addr) addr; \
58 DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
59 init_t init = (init_t) addr; \
60 init (argc, argv, env); \
61}
62
63#define DL_CALL_DT_FINI(map, start) \
64{ \
65 ElfW(Addr) addr; \
66 DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
67 fini_t fini = (fini_t) addr; \
68 fini (); \
69}
70
71/* The type of the return value of fixup/profile_fixup */
72#define DL_FIXUP_VALUE_TYPE struct fdesc
73
74/* Construct a fixup value from the address and linkmap */
75#define DL_FIXUP_MAKE_VALUE(map, addr) \
76 (map) ? ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) \
77 : ((struct fdesc) { 0, 0 })
78
79/* Extract the code address from a fixup value */
80#define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip)
81#define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
82#define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))
83

Warning: That file was not part of the compilation database. It may have many parsing errors.