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3c3bdf30 | 1 | # This shell script emits a C file. -*- C -*- |
82704155 | 2 | # Copyright (C) 2001-2019 Free Software Foundation, Inc. |
3c3bdf30 | 3 | # |
f96b4a7b | 4 | # This file is part of the GNU Binutils. |
3c3bdf30 NC |
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 | |
f96b4a7b | 8 | # the Free Software Foundation; either version 3 of the License, or |
3c3bdf30 NC |
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 | |
f96b4a7b NC |
18 | # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
19 | # MA 02110-1301, USA. | |
3c3bdf30 NC |
20 | # |
21 | ||
a4308b79 | 22 | # This file is sourced from generic.em. |
3c3bdf30 | 23 | |
92b93329 | 24 | fragment <<EOF |
a4308b79 HPN |
25 | /* Need to have this macro defined before mmix-elfnmmo, which uses the |
26 | name for the before_allocation function, defined in ldemul.c (for | |
27 | the mmo "emulation") or in elf32.em (for the elf64mmix | |
28 | "emulation"). */ | |
48fa4a5d | 29 | #define gldmmo_before_allocation before_allocation_default |
8ded5a0f | 30 | |
a4308b79 HPN |
31 | /* We include this header *not* because we expect to handle ELF here |
32 | but because we re-use the map_segments function in elf-generic.em, | |
33 | a file which is rightly somewhat ELF-centric. But this is only to | |
34 | get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be | |
35 | output from the mmo emulation: -m mmo --oformat elf64-mmix! */ | |
8ded5a0f | 36 | #include "elf-bfd.h" |
eaeb0a9d AM |
37 | |
38 | static void gld${EMULATION_NAME}_after_allocation (void); | |
48fa4a5d HPN |
39 | EOF |
40 | ||
92b93329 RM |
41 | source_em ${srcdir}/emultempl/elf-generic.em |
42 | source_em ${srcdir}/emultempl/mmix-elfnmmo.em | |
3c3bdf30 | 43 | |
92b93329 | 44 | fragment <<EOF |
3c3bdf30 | 45 | |
3c3bdf30 NC |
46 | /* Place an orphan section. We use this to put random SEC_CODE or |
47 | SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed | |
48 | from elf32.em. */ | |
49 | ||
c2edb4b8 | 50 | static lang_output_section_statement_type * |
8a99a385 AM |
51 | mmo_place_orphan (asection *s, |
52 | const char *secname, | |
53 | int constraint ATTRIBUTE_UNUSED) | |
3c3bdf30 | 54 | { |
a9ae0bda HPN |
55 | static struct |
56 | { | |
57 | flagword nonzero_flags; | |
58 | struct orphan_save orphansave; | |
59 | } holds[] = | |
60 | { | |
61 | { | |
62 | SEC_CODE | SEC_READONLY, | |
63 | { | |
64 | MMO_TEXT_SECTION_NAME, | |
65 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, | |
66 | 0, 0, 0, 0 | |
67 | } | |
68 | }, | |
69 | { | |
70 | SEC_LOAD | SEC_DATA, | |
71 | { | |
72 | MMO_DATA_SECTION_NAME, | |
73 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA, | |
74 | 0, 0, 0, 0 | |
75 | } | |
76 | }, | |
77 | { | |
78 | SEC_ALLOC, | |
79 | { | |
80 | ".bss", | |
81 | SEC_ALLOC, | |
82 | 0, 0, 0, 0 | |
83 | } | |
84 | } | |
85 | }; | |
86 | ||
87 | struct orphan_save *place = NULL; | |
afd7a018 | 88 | lang_output_section_statement_type *after; |
3c3bdf30 | 89 | lang_output_section_statement_type *os; |
a9ae0bda | 90 | size_t i; |
93638471 AM |
91 | flagword flags; |
92 | asection *nexts; | |
3c3bdf30 | 93 | |
a9ae0bda HPN |
94 | /* We have nothing to say for anything other than a final link or |
95 | for sections that are excluded. */ | |
0e1862bb | 96 | if (bfd_link_relocatable (&link_info) |
a9ae0bda | 97 | || (s->flags & SEC_EXCLUDE) != 0) |
c2edb4b8 | 98 | return NULL; |
3c3bdf30 | 99 | |
afd7a018 | 100 | os = lang_output_section_find (secname); |
3c3bdf30 NC |
101 | |
102 | /* We have an output section by this name. Place the section inside it | |
103 | (regardless of whether the linker script lists it as input). */ | |
104 | if (os != NULL) | |
105 | { | |
b9c361e0 | 106 | lang_add_section (&os->children, s, NULL, os); |
c2edb4b8 | 107 | return os; |
3c3bdf30 NC |
108 | } |
109 | ||
523f4c92 L |
110 | flags = s->flags; |
111 | if (!bfd_link_relocatable (&link_info)) | |
112 | { | |
113 | nexts = s; | |
114 | while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts)) | |
115 | != NULL) | |
116 | if (nexts->output_section == NULL | |
117 | && (nexts->flags & SEC_EXCLUDE) == 0 | |
118 | && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0 | |
119 | && (nexts->owner->flags & DYNAMIC) == 0 | |
120 | && nexts->owner->usrdata != NULL | |
121 | && !(((lang_input_statement_type *) nexts->owner->usrdata) | |
122 | ->flags.just_syms)) | |
123 | flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY)) | |
124 | ^ SEC_READONLY); | |
125 | } | |
126 | ||
a9ae0bda HPN |
127 | /* Check for matching section type flags for sections we care about. |
128 | A section without contents can have SEC_LOAD == 0, but we still | |
129 | want it attached to a sane section so the symbols appear as | |
130 | expected. */ | |
523f4c92 | 131 | |
93638471 | 132 | if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY) |
a9ae0bda | 133 | for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++) |
93638471 | 134 | if ((flags & holds[i].nonzero_flags) != 0) |
a9ae0bda HPN |
135 | { |
136 | place = &holds[i].orphansave; | |
137 | if (place->os == NULL) | |
138 | place->os = lang_output_section_find (place->name); | |
139 | break; | |
140 | } | |
141 | ||
142 | if (place == NULL) | |
143 | { | |
144 | /* For other combinations, we have to give up, except we make | |
145 | sure not to place the orphan section after the | |
146 | linker-generated register section; that'd make it continue | |
147 | the reg section and we never want that to happen for orphan | |
148 | sections. */ | |
149 | lang_output_section_statement_type *before; | |
150 | lang_output_section_statement_type *lookup; | |
151 | static struct orphan_save hold_nonreg = | |
152 | { | |
153 | NULL, | |
154 | SEC_READONLY, | |
155 | 0, 0, 0, 0 | |
156 | }; | |
157 | ||
158 | if (hold_nonreg.os == NULL) | |
159 | { | |
160 | before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME); | |
161 | ||
162 | /* If we have no such section, all fine; we don't care where | |
163 | it's placed. */ | |
164 | if (before == NULL) | |
165 | return NULL; | |
166 | ||
167 | /* We have to find the oss before this one, so we can use that as | |
168 | "after". */ | |
169 | for (lookup = &lang_output_section_statement.head->output_section_statement; | |
170 | lookup != NULL && lookup->next != before; | |
171 | lookup = lookup->next) | |
172 | ; | |
173 | ||
174 | hold_nonreg.os = lookup; | |
175 | } | |
176 | ||
177 | place = &hold_nonreg; | |
178 | } | |
3c3bdf30 | 179 | |
a9ae0bda HPN |
180 | after = place->os; |
181 | if (after == NULL) | |
182 | return NULL; | |
3c3bdf30 | 183 | |
a9ae0bda HPN |
184 | /* If there's an output section by *this* name, we'll use it, regardless |
185 | of actual section flags, in contrast to what's done in elf32.em. */ | |
8a99a385 | 186 | os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); |
25844aae | 187 | |
c2edb4b8 | 188 | return os; |
3c3bdf30 NC |
189 | } |
190 | ||
191 | /* Remove the spurious settings of SEC_RELOC that make it to the output at | |
192 | link time. We are as confused as elflink.h:elf_bfd_final_link, and | |
193 | paper over the bug similarly. */ | |
194 | ||
195 | static void | |
0c7a8e5a | 196 | mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
197 | { |
198 | bfd_set_section_flags (abfd, sec, | |
199 | bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); | |
200 | } | |
201 | ||
202 | /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ | |
203 | ||
204 | static void | |
eaeb0a9d | 205 | gld${EMULATION_NAME}_after_allocation (void) |
3c3bdf30 | 206 | { |
f13a99db | 207 | bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); |
8ded5a0f | 208 | gld${EMULATION_NAME}_map_segments (FALSE); |
3c3bdf30 | 209 | } |
48fa4a5d HPN |
210 | \f |
211 | /* To get on-demand global register allocation right, we need to parse the | |
212 | relocs, like what happens when linking to ELF. It needs to be done | |
213 | before all input sections are supposed to be present. When linking to | |
214 | ELF, it's done when reading symbols. When linking to mmo, we do it | |
215 | when all input files are seen, which is equivalent. */ | |
3c3bdf30 | 216 | |
48fa4a5d | 217 | static void |
0c7a8e5a | 218 | mmo_after_open (void) |
48fa4a5d | 219 | { |
1c5e6447 HPN |
220 | /* When there's a mismatch between the output format and the emulation |
221 | (using weird combinations like "-m mmo --oformat elf64-mmix" for | |
222 | example), we'd count relocs twice because they'd also be counted | |
223 | along the usual route for ELF-only linking, which would lead to an | |
224 | internal accounting error. */ | |
f13a99db | 225 | if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) |
48fa4a5d | 226 | { |
1c5e6447 HPN |
227 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
228 | { | |
229 | if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour | |
230 | && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) | |
df5f2391 | 231 | einfo (_("%X%P: internal problems scanning %pB after opening it"), |
1c5e6447 HPN |
232 | is->the_bfd); |
233 | } | |
48fa4a5d | 234 | } |
5c3049d2 | 235 | after_open_default (); |
48fa4a5d | 236 | } |
3c3bdf30 NC |
237 | EOF |
238 | ||
239 | LDEMUL_PLACE_ORPHAN=mmo_place_orphan | |
48fa4a5d | 240 | LDEMUL_AFTER_OPEN=mmo_after_open |