Commit | Line | Data |
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d871d478 | 1 | /* Emulation code used by all ELF targets. |
250d07de | 2 | Copyright (C) 1991-2021 Free Software Foundation, Inc. |
d871d478 AM |
3 | |
4 | This file is part of the GNU Binutils. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | #include "sysdep.h" | |
22 | #include "bfd.h" | |
0b4453c7 | 23 | #include "bfdlink.h" |
1ff6de03 | 24 | #include "ctf-api.h" |
d871d478 AM |
25 | #include "ld.h" |
26 | #include "ldmain.h" | |
27 | #include "ldmisc.h" | |
28 | #include "ldexp.h" | |
29 | #include "ldlang.h" | |
30 | #include "elf-bfd.h" | |
3d16b64e | 31 | #include "elf/internal.h" |
d871d478 AM |
32 | #include "ldelfgen.h" |
33 | ||
34 | void | |
35 | ldelf_map_segments (bfd_boolean need_layout) | |
36 | { | |
37 | int tries = 10; | |
38 | ||
39 | do | |
40 | { | |
41 | lang_relax_sections (need_layout); | |
42 | need_layout = FALSE; | |
43 | ||
44 | if (link_info.output_bfd->xvec->flavour == bfd_target_elf_flavour | |
45 | && !bfd_link_relocatable (&link_info)) | |
46 | { | |
47 | bfd_size_type phdr_size; | |
48 | ||
49 | phdr_size = elf_program_header_size (link_info.output_bfd); | |
50 | /* If we don't have user supplied phdrs, throw away any | |
51 | previous linker generated program headers. */ | |
52 | if (lang_phdr_list == NULL) | |
53 | elf_seg_map (link_info.output_bfd) = NULL; | |
54 | if (!_bfd_elf_map_sections_to_segments (link_info.output_bfd, | |
55 | &link_info)) | |
56 | einfo (_("%F%P: map sections to segments failed: %E\n")); | |
57 | ||
58 | if (phdr_size != elf_program_header_size (link_info.output_bfd)) | |
59 | { | |
60 | if (tries > 6) | |
61 | /* The first few times we allow any change to | |
62 | phdr_size . */ | |
63 | need_layout = TRUE; | |
64 | else if (phdr_size | |
65 | < elf_program_header_size (link_info.output_bfd)) | |
66 | /* After that we only allow the size to grow. */ | |
67 | need_layout = TRUE; | |
68 | else | |
69 | elf_program_header_size (link_info.output_bfd) = phdr_size; | |
70 | } | |
71 | } | |
72 | } | |
73 | while (need_layout && --tries); | |
74 | ||
75 | if (tries == 0) | |
76 | einfo (_("%F%P: looping in map_segments")); | |
6f6fd151 L |
77 | |
78 | if (link_info.output_bfd->xvec->flavour == bfd_target_elf_flavour | |
79 | && lang_phdr_list == NULL) | |
80 | { | |
81 | /* If we don't have user supplied phdrs, strip zero-sized dynamic | |
82 | sections and regenerate program headers. */ | |
83 | const struct elf_backend_data *bed | |
84 | = get_elf_backend_data (link_info.output_bfd); | |
85 | if (bed->elf_backend_strip_zero_sized_dynamic_sections | |
86 | && !bed->elf_backend_strip_zero_sized_dynamic_sections | |
87 | (&link_info)) | |
88 | einfo (_("%F%P: failed to strip zero-sized dynamic sections")); | |
89 | } | |
d871d478 | 90 | } |
1ff6de03 | 91 | |
094e34f2 | 92 | #ifdef ENABLE_LIBCTF |
1ff6de03 NA |
93 | /* We want to emit CTF early if and only if we are not targetting ELF with this |
94 | invocation. */ | |
95 | ||
96 | int | |
97 | ldelf_emit_ctf_early (void) | |
98 | { | |
99 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) | |
100 | return 0; | |
101 | return 1; | |
102 | } | |
103 | ||
104 | /* Callbacks used to map from bfd types to libctf types, under libctf's | |
105 | control. */ | |
106 | ||
3d16b64e | 107 | struct ctf_strtab_iter_cb_arg |
1ff6de03 | 108 | { |
3d16b64e | 109 | struct elf_strtab_hash *strtab; |
1ff6de03 NA |
110 | size_t next_i; |
111 | size_t next_idx; | |
112 | }; | |
113 | ||
114 | /* Return strings from the strtab to libctf, one by one. Returns NULL when | |
115 | iteration is complete. */ | |
116 | ||
117 | static const char * | |
118 | ldelf_ctf_strtab_iter_cb (uint32_t *offset, void *arg_) | |
119 | { | |
120 | bfd_size_type off; | |
121 | const char *ret; | |
122 | ||
3d16b64e NA |
123 | struct ctf_strtab_iter_cb_arg *arg = |
124 | (struct ctf_strtab_iter_cb_arg *) arg_; | |
1ff6de03 NA |
125 | |
126 | /* There is no zeroth string. */ | |
127 | if (arg->next_i == 0) | |
128 | arg->next_i = 1; | |
129 | ||
3d16b64e | 130 | if (arg->next_i >= _bfd_elf_strtab_len (arg->strtab)) |
1ff6de03 NA |
131 | { |
132 | arg->next_i = 0; | |
133 | return NULL; | |
134 | } | |
135 | ||
3d16b64e | 136 | ret = _bfd_elf_strtab_str (arg->strtab, arg->next_i++, &off); |
1ff6de03 NA |
137 | *offset = off; |
138 | ||
139 | /* If we've overflowed, we cannot share any further strings: the CTF | |
140 | format cannot encode strings with such high offsets. */ | |
141 | if (*offset != off) | |
142 | return NULL; | |
143 | ||
144 | return ret; | |
145 | } | |
146 | ||
3d16b64e NA |
147 | void |
148 | ldelf_acquire_strings_for_ctf | |
149 | (struct ctf_dict *ctf_output, struct elf_strtab_hash *strtab) | |
1ff6de03 | 150 | { |
3d16b64e NA |
151 | struct ctf_strtab_iter_cb_arg args = { strtab, 0, 0 }; |
152 | if (!ctf_output) | |
153 | return; | |
1ff6de03 | 154 | |
3d16b64e | 155 | if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) |
1ff6de03 | 156 | { |
3d16b64e NA |
157 | if (ctf_link_add_strtab (ctf_output, ldelf_ctf_strtab_iter_cb, |
158 | &args) < 0) | |
159 | einfo (_("%F%P: warning: CTF strtab association failed; strings will " | |
160 | "not be shared: %s\n"), | |
161 | ctf_errmsg (ctf_errno (ctf_output))); | |
1ff6de03 | 162 | } |
1ff6de03 NA |
163 | } |
164 | ||
165 | void | |
3d16b64e NA |
166 | ldelf_new_dynsym_for_ctf (struct ctf_dict *ctf_output, int symidx, |
167 | struct elf_internal_sym *sym) | |
1ff6de03 | 168 | { |
3d16b64e NA |
169 | ctf_link_sym_t lsym; |
170 | ||
171 | if (!ctf_output) | |
1ff6de03 NA |
172 | return; |
173 | ||
3d16b64e NA |
174 | /* New symbol. */ |
175 | if (sym != NULL) | |
1ff6de03 | 176 | { |
3d16b64e NA |
177 | lsym.st_name = NULL; |
178 | lsym.st_nameidx = sym->st_name; | |
179 | lsym.st_nameidx_set = 1; | |
180 | lsym.st_symidx = symidx; | |
181 | lsym.st_shndx = sym->st_shndx; | |
182 | lsym.st_type = ELF_ST_TYPE (sym->st_info); | |
183 | lsym.st_value = sym->st_value; | |
184 | if (ctf_link_add_linker_symbol (ctf_output, &lsym) < 0) | |
185 | { | |
186 | einfo (_("%F%P: warning: CTF symbol addition failed; CTF will " | |
187 | "not be tied to symbols: %s\n"), | |
188 | ctf_errmsg (ctf_errno (ctf_output))); | |
189 | } | |
190 | } | |
191 | else | |
192 | { | |
193 | /* Shuffle all the symbols. */ | |
1ff6de03 | 194 | |
3d16b64e NA |
195 | if (ctf_link_shuffle_syms (ctf_output) < 0) |
196 | einfo (_("%F%P: warning: CTF symbol shuffling failed; CTF will " | |
197 | "not be tied to symbols: %s\n"), | |
198 | ctf_errmsg (ctf_errno (ctf_output))); | |
1ff6de03 NA |
199 | } |
200 | } | |
094e34f2 | 201 | #else |
3d16b64e NA |
202 | int |
203 | ldelf_emit_ctf_early (void) | |
094e34f2 NA |
204 | { |
205 | return 0; | |
206 | } | |
207 | ||
3d16b64e NA |
208 | void |
209 | ldelf_acquire_strings_for_ctf (struct ctf_dict *ctf_output ATTRIBUTE_UNUSED, | |
210 | struct elf_strtab_hash *strtab ATTRIBUTE_UNUSED) | |
211 | {} | |
212 | void | |
213 | ldelf_new_dynsym_for_ctf (struct ctf_dict *ctf_output ATTRIBUTE_UNUSED, | |
214 | int symidx ATTRIBUTE_UNUSED, | |
215 | struct elf_internal_sym *sym ATTRIBUTE_UNUSED) | |
094e34f2 NA |
216 | {} |
217 | #endif |