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1 | /* ELF STT_GNU_IFUNC support. |
2 | Copyright 2009 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
20 | MA 02110-1301, USA. */ | |
21 | ||
22 | #include "sysdep.h" | |
23 | #include "bfd.h" | |
24 | #include "bfdlink.h" | |
25 | #include "libbfd.h" | |
26 | #define ARCH_SIZE 0 | |
27 | #include "elf-bfd.h" | |
28 | #include "safe-ctype.h" | |
29 | #include "libiberty.h" | |
30 | #include "objalloc.h" | |
31 | ||
32 | /* Create sections needed by STT_GNU_IFUNC symbol. */ | |
33 | ||
34 | bfd_boolean | |
35 | _bfd_elf_create_ifunc_sections (bfd *abfd, struct bfd_link_info *info) | |
36 | { | |
37 | flagword flags, pltflags; | |
38 | asection *s; | |
39 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
40 | struct elf_link_hash_table *htab = elf_hash_table (info); | |
41 | ||
42 | if (htab->irelifunc != NULL || htab->iplt != NULL) | |
43 | return TRUE; | |
44 | ||
45 | flags = bed->dynamic_sec_flags; | |
46 | pltflags = flags; | |
47 | if (bed->plt_not_loaded) | |
48 | /* We do not clear SEC_ALLOC here because we still want the OS to | |
49 | allocate space for the section; it's just that there's nothing | |
50 | to read in from the object file. */ | |
51 | pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); | |
52 | else | |
53 | pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD; | |
54 | if (bed->plt_readonly) | |
55 | pltflags |= SEC_READONLY; | |
56 | ||
57 | if (info->shared) | |
58 | { | |
59 | /* We need to create .rel[a].ifunc for shared objects. */ | |
60 | const char *rel_sec = (bed->rela_plts_and_copies_p | |
61 | ? ".rela.ifunc" : ".rel.ifunc"); | |
62 | ||
63 | s = bfd_make_section_with_flags (abfd, rel_sec, | |
64 | flags | SEC_READONLY); | |
65 | if (s == NULL | |
66 | || ! bfd_set_section_alignment (abfd, s, | |
67 | bed->s->log_file_align)) | |
68 | return FALSE; | |
69 | htab->irelifunc = s; | |
70 | } | |
71 | else | |
72 | { | |
73 | /* We need to create .iplt, .rel[a].iplt, .igot and .igot.plt | |
74 | for static executables. */ | |
75 | s = bfd_make_section_with_flags (abfd, ".iplt", pltflags); | |
76 | if (s == NULL | |
77 | || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) | |
78 | return FALSE; | |
79 | htab->iplt = s; | |
80 | ||
81 | s = bfd_make_section_with_flags (abfd, | |
82 | (bed->rela_plts_and_copies_p | |
83 | ? ".rela.iplt" : ".rel.iplt"), | |
84 | flags | SEC_READONLY); | |
85 | if (s == NULL | |
86 | || ! bfd_set_section_alignment (abfd, s, | |
87 | bed->s->log_file_align)) | |
88 | return FALSE; | |
89 | htab->irelplt = s; | |
90 | ||
91 | /* We don't need the .igot section if we have the .igot.plt | |
92 | section. */ | |
93 | if (bed->want_got_plt) | |
94 | s = bfd_make_section_with_flags (abfd, ".igot.plt", flags); | |
95 | else | |
96 | s = bfd_make_section_with_flags (abfd, ".igot", flags); | |
97 | if (s == NULL | |
98 | || !bfd_set_section_alignment (abfd, s, | |
99 | bed->s->log_file_align)) | |
100 | return FALSE; | |
101 | htab->igotplt = s; | |
102 | } | |
103 | ||
104 | return TRUE; | |
105 | } |