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1 | /* Configuration of lookup functions. |
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2 | Copyright (C) 2000-2022 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 | <https://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. */ |
25 | struct link_map; |
26 | |
27 | void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref); |
28 | rtld_hidden_proto (_dl_symbol_address) |
29 | |
30 | #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref) |
31 | |
32 | Elf32_Addr _dl_lookup_address (const void *address); |
33 | rtld_hidden_proto (_dl_lookup_address) |
34 | |
35 | #define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr) |
36 | |
37 | void attribute_hidden _dl_unmap (struct link_map *map); |
38 | |
39 | #define DL_UNMAP(map) _dl_unmap (map) |
40 | |
41 | #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \ |
42 | attr volatile unsigned int fptr[2]; \ |
43 | /* The test for "start & 2" below is to accommodate old binaries which \ |
44 | violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \ |
45 | descriptor. */ \ |
46 | if ((ElfW(Addr)) (start) & 2) \ |
47 | addr = (ElfW(Addr)) start; \ |
48 | else \ |
49 | { \ |
50 | fptr[0] = (unsigned int) (start); \ |
51 | fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \ |
52 | /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \ |
53 | addr = (ElfW(Addr))((unsigned int)fptr | 2); \ |
54 | } \ |
55 | |
56 | #define DL_CALL_DT_INIT(map, start, argc, argv, env) \ |
57 | { \ |
58 | ElfW(Addr) addr; \ |
59 | DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ |
60 | dl_init_t init = (dl_init_t) addr; \ |
61 | init (argc, argv, env); \ |
62 | } |
63 | |
64 | #define DL_CALL_DT_FINI(map, start) \ |
65 | { \ |
66 | ElfW(Addr) addr; \ |
67 | DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ |
68 | fini_t fini = (fini_t) addr; \ |
69 | fini (); \ |
70 | } |
71 | |
72 | /* The type of the return value of fixup/profile_fixup */ |
73 | #define DL_FIXUP_VALUE_TYPE struct fdesc |
74 | |
75 | /* Construct a fixup value from the address and linkmap */ |
76 | #define DL_FIXUP_MAKE_VALUE(map, addr) \ |
77 | (map) ? ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) \ |
78 | : ((struct fdesc) { 0, 0 }) |
79 | |
80 | /* Extract the code address from a fixup value */ |
81 | #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip) |
82 | #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value)) |
83 | /* Clear the plabel bit to get the actual address of the descriptor. */ |
84 | #define DL_FIXUP_ADDR_VALUE(addr) \ |
85 | (*(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (addr) & ~2)) |
86 | #define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr) |
87 | #define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \ |
88 | *(value) = *(DL_FIXUP_VALUE_TYPE *) ((uintptr_t) (new_value) & ~2) |
89 |
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