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0752970e | 1 | # This shell script emits a C file. -*- C -*- |
82704155 | 2 | # Copyright (C) 2000-2019 Free Software Foundation, Inc. |
0752970e NC |
3 | # Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on armelf.em |
4 | # | |
f96b4a7b | 5 | # This file is part of the GNU Binutils. |
0752970e NC |
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 | |
f96b4a7b | 9 | # the Free Software Foundation; either version 3 of the License, or |
0752970e NC |
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 | |
f96b4a7b NC |
19 | # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | # MA 02110-1301, USA. | |
21 | ||
0752970e | 22 | |
36bdbeec NC |
23 | # This file is sourced from elf32.em, and defines some extra routines for m68k |
24 | # embedded systems using ELF and for some other systems using m68k ELF. While | |
25 | # it is sourced from elf32.em for all m68k ELF configurations, here we include | |
26 | # only the features we want depending on the configuration. | |
27 | ||
28 | case ${target} in | |
29 | m68*-*-elf) | |
30 | echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c | |
31 | ;; | |
32 | esac | |
33 | ||
7fb9f789 NC |
34 | case ${target} in |
35 | *-linux*) | |
36 | # Don't use multi-GOT by default due to glibc linker's assumption | |
37 | # that GOT pointer points to GOT[0]. | |
38 | # got_handling_target_default=GOT_HANDLING_MULTIGOT | |
39 | got_handling_target_default=GOT_HANDLING_SINGLE | |
40 | ;; | |
41 | *) | |
42 | got_handling_target_default=GOT_HANDLING_SINGLE | |
43 | ;; | |
44 | esac | |
45 | ||
92b93329 | 46 | fragment <<EOF |
0752970e | 47 | |
7fb9f789 NC |
48 | #define GOT_HANDLING_SINGLE (0) |
49 | #define GOT_HANDLING_NEGATIVE (1) | |
50 | #define GOT_HANDLING_MULTIGOT (2) | |
51 | #define GOT_HANDLING_TARGET_DEFAULT ${got_handling_target_default} | |
52 | ||
53 | /* How to generate GOT. */ | |
54 | static int got_handling = GOT_HANDLING_DEFAULT; | |
55 | ||
36bdbeec | 56 | #ifdef SUPPORT_EMBEDDED_RELOCS |
0c7a8e5a | 57 | static void check_sections (bfd *, asection *, void *); |
36bdbeec | 58 | #endif |
0752970e | 59 | |
36bdbeec | 60 | /* This function is run after all the input files have been opened. */ |
0752970e NC |
61 | |
62 | static void | |
0c7a8e5a | 63 | m68k_elf_after_open (void) |
0752970e | 64 | { |
0752970e NC |
65 | /* Call the standard elf routine. */ |
66 | gld${EMULATION_NAME}_after_open (); | |
67 | ||
36bdbeec NC |
68 | #ifdef SUPPORT_EMBEDDED_RELOCS |
69 | if (command_line.embedded_relocs | |
0e1862bb | 70 | && (!bfd_link_relocatable (&link_info))) |
0752970e | 71 | { |
36bdbeec NC |
72 | bfd *abfd; |
73 | ||
74 | /* In the embedded relocs mode we create a .emreloc section for each | |
75 | input file with a nonzero .data section. The BFD backend will fill in | |
76 | these sections with magic numbers which can be used to relocate the | |
77 | data section at run time. */ | |
c72f2fb2 | 78 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) |
0752970e | 79 | { |
36bdbeec NC |
80 | asection *datasec; |
81 | ||
dc12032b AM |
82 | if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) |
83 | einfo (_("%F%P: %pB: all input objects must be ELF " | |
d003af55 | 84 | "for --embedded-relocs\n")); |
36bdbeec NC |
85 | |
86 | datasec = bfd_get_section_by_name (abfd, ".data"); | |
87 | ||
88 | /* Note that we assume that the reloc_count field has already | |
89 | been set up. We could call bfd_get_reloc_upper_bound, but | |
90 | that returns the size of a memory buffer rather than a reloc | |
91 | count. We do not want to call bfd_canonicalize_reloc, | |
92 | because although it would always work it would force us to | |
93 | read in the relocs into BFD canonical form, which would waste | |
94 | a significant amount of time and memory. */ | |
95 | if (datasec != NULL && datasec->reloc_count > 0) | |
96 | { | |
97 | asection *relsec; | |
98 | ||
9795b468 AM |
99 | relsec = bfd_make_section_with_flags (abfd, ".emreloc", |
100 | (SEC_ALLOC | |
101 | | SEC_LOAD | |
102 | | SEC_HAS_CONTENTS | |
103 | | SEC_IN_MEMORY)); | |
36bdbeec | 104 | if (relsec == NULL |
36bdbeec NC |
105 | || ! bfd_set_section_alignment (abfd, relsec, 2) |
106 | || ! bfd_set_section_size (abfd, relsec, | |
107 | datasec->reloc_count * 12)) | |
df5f2391 | 108 | einfo (_("%F%P: %pB: can not create .emreloc section: %E\n")); |
36bdbeec NC |
109 | } |
110 | ||
111 | /* Double check that all other data sections are empty, as is | |
112 | required for embedded PIC code. */ | |
1579bae1 | 113 | bfd_map_over_sections (abfd, check_sections, datasec); |
0752970e | 114 | } |
0752970e | 115 | } |
36bdbeec | 116 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
0752970e NC |
117 | } |
118 | ||
36bdbeec | 119 | #ifdef SUPPORT_EMBEDDED_RELOCS |
0752970e NC |
120 | /* Check that of the data sections, only the .data section has |
121 | relocs. This is called via bfd_map_over_sections. */ | |
122 | ||
123 | static void | |
1579bae1 | 124 | check_sections (bfd *abfd, asection *sec, void *datasec) |
0752970e NC |
125 | { |
126 | if ((bfd_get_section_flags (abfd, sec) & SEC_DATA) | |
1579bae1 | 127 | && sec != datasec |
0752970e | 128 | && sec->reloc_count != 0) |
df5f2391 | 129 | einfo (_("%X%P: %pB: section %s has relocs; can not use --embedded-relocs\n"), |
0752970e NC |
130 | abfd, bfd_get_section_name (abfd, sec)); |
131 | } | |
132 | ||
36bdbeec NC |
133 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
134 | ||
0752970e | 135 | /* This function is called after the section sizes and offsets have |
36bdbeec | 136 | been set. */ |
0752970e NC |
137 | |
138 | static void | |
0c7a8e5a | 139 | m68k_elf_after_allocation (void) |
0752970e | 140 | { |
0752970e | 141 | /* Call the standard elf routine. */ |
eaeb0a9d | 142 | gld${EMULATION_NAME}_after_allocation (); |
0752970e | 143 | |
36bdbeec NC |
144 | #ifdef SUPPORT_EMBEDDED_RELOCS |
145 | if (command_line.embedded_relocs | |
0e1862bb | 146 | && (!bfd_link_relocatable (&link_info))) |
0752970e | 147 | { |
36bdbeec | 148 | bfd *abfd; |
0752970e | 149 | |
36bdbeec NC |
150 | /* If we are generating embedded relocs, call a special BFD backend |
151 | routine to do the work. */ | |
c72f2fb2 | 152 | for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next) |
0752970e | 153 | { |
36bdbeec NC |
154 | asection *datasec, *relsec; |
155 | char *errmsg; | |
156 | ||
157 | datasec = bfd_get_section_by_name (abfd, ".data"); | |
158 | ||
159 | if (datasec == NULL || datasec->reloc_count == 0) | |
160 | continue; | |
161 | ||
162 | relsec = bfd_get_section_by_name (abfd, ".emreloc"); | |
163 | ASSERT (relsec != NULL); | |
164 | ||
dc12032b | 165 | if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) |
36bdbeec NC |
166 | { |
167 | if (! bfd_m68k_elf32_create_embedded_relocs (abfd, &link_info, | |
168 | datasec, relsec, | |
169 | &errmsg)) | |
170 | { | |
171 | if (errmsg == NULL) | |
df5f2391 | 172 | einfo (_("%X%P: %pB: can not create " |
d003af55 | 173 | "runtime reloc information: %E\n"), |
36bdbeec NC |
174 | abfd); |
175 | else | |
df5f2391 | 176 | einfo (_("%X%P: %pB: can not create " |
d003af55 | 177 | "runtime reloc information: %s\n"), |
36bdbeec NC |
178 | abfd, errmsg); |
179 | } | |
180 | } | |
0752970e | 181 | else |
36bdbeec | 182 | abort (); |
0752970e NC |
183 | } |
184 | } | |
36bdbeec | 185 | #endif /* SUPPORT_EMBEDDED_RELOCS */ |
0752970e NC |
186 | } |
187 | ||
7fb9f789 NC |
188 | /* This is a convenient point to tell BFD about target specific flags. |
189 | After the output has been created, but before inputs are read. */ | |
190 | ||
191 | static void | |
192 | elf_m68k_create_output_section_statements (void) | |
193 | { | |
194 | bfd_elf_m68k_set_target_options (&link_info, got_handling); | |
195 | } | |
196 | ||
0752970e NC |
197 | EOF |
198 | ||
7fb9f789 NC |
199 | # Define some shell vars to insert bits of code into the standard elf |
200 | # parse_args and list_options functions. | |
201 | # | |
202 | PARSE_AND_LIST_PROLOGUE=' | |
203 | #define OPTION_GOT 301 | |
204 | ' | |
205 | ||
206 | PARSE_AND_LIST_LONGOPTS=' | |
207 | { "got", required_argument, NULL, OPTION_GOT}, | |
208 | ' | |
209 | ||
210 | PARSE_AND_LIST_OPTIONS=' | |
211 | fprintf (file, _(" --got=<type> Specify GOT handling scheme\n")); | |
212 | ' | |
213 | ||
214 | PARSE_AND_LIST_ARGS_CASES=' | |
215 | case OPTION_GOT: | |
216 | if (strcmp (optarg, "target") == 0) | |
6c19b93b | 217 | got_handling = GOT_HANDLING_TARGET_DEFAULT; |
7fb9f789 | 218 | else if (strcmp (optarg, "single") == 0) |
6c19b93b | 219 | got_handling = 0; |
7fb9f789 | 220 | else if (strcmp (optarg, "negative") == 0) |
6c19b93b | 221 | got_handling = 1; |
7fb9f789 | 222 | else if (strcmp (optarg, "multigot") == 0) |
6c19b93b | 223 | got_handling = 2; |
7fb9f789 | 224 | else |
df5f2391 | 225 | einfo (_("%P: unrecognized --got argument '\''%s'\''\n"), optarg); |
7fb9f789 NC |
226 | break; |
227 | ' | |
228 | ||
0752970e NC |
229 | # We have our own after_open and after_allocation functions, but they call |
230 | # the standard routines, so give them a different name. | |
231 | LDEMUL_AFTER_OPEN=m68k_elf_after_open | |
232 | LDEMUL_AFTER_ALLOCATION=m68k_elf_after_allocation | |
7fb9f789 | 233 | LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=elf_m68k_create_output_section_statements |