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3c3bdf30 | 1 | # This shell script emits a C file. -*- C -*- |
aa820537 | 2 | # Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
f13a99db | 3 | # Free Software Foundation, Inc. |
3c3bdf30 | 4 | # |
f96b4a7b | 5 | # This file is part of the GNU Binutils. |
3c3bdf30 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 |
3c3bdf30 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. | |
3c3bdf30 NC |
21 | # |
22 | ||
a4308b79 | 23 | # This file is sourced from generic.em. |
3c3bdf30 | 24 | |
92b93329 | 25 | fragment <<EOF |
a4308b79 HPN |
26 | /* Need to have this macro defined before mmix-elfnmmo, which uses the |
27 | name for the before_allocation function, defined in ldemul.c (for | |
28 | the mmo "emulation") or in elf32.em (for the elf64mmix | |
29 | "emulation"). */ | |
48fa4a5d | 30 | #define gldmmo_before_allocation before_allocation_default |
8ded5a0f | 31 | |
a4308b79 HPN |
32 | /* We include this header *not* because we expect to handle ELF here |
33 | but because we re-use the map_segments function in elf-generic.em, | |
34 | a file which is rightly somewhat ELF-centric. But this is only to | |
35 | get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be | |
36 | output from the mmo emulation: -m mmo --oformat elf64-mmix! */ | |
8ded5a0f | 37 | #include "elf-bfd.h" |
eaeb0a9d AM |
38 | |
39 | static void gld${EMULATION_NAME}_after_allocation (void); | |
48fa4a5d HPN |
40 | EOF |
41 | ||
92b93329 RM |
42 | source_em ${srcdir}/emultempl/elf-generic.em |
43 | source_em ${srcdir}/emultempl/mmix-elfnmmo.em | |
3c3bdf30 | 44 | |
92b93329 | 45 | fragment <<EOF |
3c3bdf30 | 46 | |
3c3bdf30 NC |
47 | /* Place an orphan section. We use this to put random SEC_CODE or |
48 | SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed | |
49 | from elf32.em. */ | |
50 | ||
c2edb4b8 | 51 | static lang_output_section_statement_type * |
8a99a385 AM |
52 | mmo_place_orphan (asection *s, |
53 | const char *secname, | |
54 | int constraint ATTRIBUTE_UNUSED) | |
3c3bdf30 | 55 | { |
a9ae0bda HPN |
56 | static struct |
57 | { | |
58 | flagword nonzero_flags; | |
59 | struct orphan_save orphansave; | |
60 | } holds[] = | |
61 | { | |
62 | { | |
63 | SEC_CODE | SEC_READONLY, | |
64 | { | |
65 | MMO_TEXT_SECTION_NAME, | |
66 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, | |
67 | 0, 0, 0, 0 | |
68 | } | |
69 | }, | |
70 | { | |
71 | SEC_LOAD | SEC_DATA, | |
72 | { | |
73 | MMO_DATA_SECTION_NAME, | |
74 | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA, | |
75 | 0, 0, 0, 0 | |
76 | } | |
77 | }, | |
78 | { | |
79 | SEC_ALLOC, | |
80 | { | |
81 | ".bss", | |
82 | SEC_ALLOC, | |
83 | 0, 0, 0, 0 | |
84 | } | |
85 | } | |
86 | }; | |
87 | ||
88 | struct orphan_save *place = NULL; | |
afd7a018 | 89 | lang_output_section_statement_type *after; |
3c3bdf30 | 90 | lang_output_section_statement_type *os; |
a9ae0bda | 91 | size_t i; |
3c3bdf30 | 92 | |
a9ae0bda HPN |
93 | /* We have nothing to say for anything other than a final link or |
94 | for sections that are excluded. */ | |
1049f94e | 95 | if (link_info.relocatable |
a9ae0bda | 96 | || (s->flags & SEC_EXCLUDE) != 0) |
c2edb4b8 | 97 | return NULL; |
3c3bdf30 | 98 | |
afd7a018 | 99 | os = lang_output_section_find (secname); |
3c3bdf30 NC |
100 | |
101 | /* We have an output section by this name. Place the section inside it | |
102 | (regardless of whether the linker script lists it as input). */ | |
103 | if (os != NULL) | |
104 | { | |
b9c361e0 | 105 | lang_add_section (&os->children, s, NULL, os); |
c2edb4b8 | 106 | return os; |
3c3bdf30 NC |
107 | } |
108 | ||
a9ae0bda HPN |
109 | /* Check for matching section type flags for sections we care about. |
110 | A section without contents can have SEC_LOAD == 0, but we still | |
111 | want it attached to a sane section so the symbols appear as | |
112 | expected. */ | |
113 | if ((s->flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY) | |
114 | for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++) | |
115 | if ((s->flags & holds[i].nonzero_flags) != 0) | |
116 | { | |
117 | place = &holds[i].orphansave; | |
118 | if (place->os == NULL) | |
119 | place->os = lang_output_section_find (place->name); | |
120 | break; | |
121 | } | |
122 | ||
123 | if (place == NULL) | |
124 | { | |
125 | /* For other combinations, we have to give up, except we make | |
126 | sure not to place the orphan section after the | |
127 | linker-generated register section; that'd make it continue | |
128 | the reg section and we never want that to happen for orphan | |
129 | sections. */ | |
130 | lang_output_section_statement_type *before; | |
131 | lang_output_section_statement_type *lookup; | |
132 | static struct orphan_save hold_nonreg = | |
133 | { | |
134 | NULL, | |
135 | SEC_READONLY, | |
136 | 0, 0, 0, 0 | |
137 | }; | |
138 | ||
139 | if (hold_nonreg.os == NULL) | |
140 | { | |
141 | before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME); | |
142 | ||
143 | /* If we have no such section, all fine; we don't care where | |
144 | it's placed. */ | |
145 | if (before == NULL) | |
146 | return NULL; | |
147 | ||
148 | /* We have to find the oss before this one, so we can use that as | |
149 | "after". */ | |
150 | for (lookup = &lang_output_section_statement.head->output_section_statement; | |
151 | lookup != NULL && lookup->next != before; | |
152 | lookup = lookup->next) | |
153 | ; | |
154 | ||
155 | hold_nonreg.os = lookup; | |
156 | } | |
157 | ||
158 | place = &hold_nonreg; | |
159 | } | |
3c3bdf30 | 160 | |
a9ae0bda HPN |
161 | after = place->os; |
162 | if (after == NULL) | |
163 | return NULL; | |
3c3bdf30 | 164 | |
a9ae0bda HPN |
165 | /* If there's an output section by *this* name, we'll use it, regardless |
166 | of actual section flags, in contrast to what's done in elf32.em. */ | |
8a99a385 | 167 | os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); |
25844aae | 168 | |
c2edb4b8 | 169 | return os; |
3c3bdf30 NC |
170 | } |
171 | ||
172 | /* Remove the spurious settings of SEC_RELOC that make it to the output at | |
173 | link time. We are as confused as elflink.h:elf_bfd_final_link, and | |
174 | paper over the bug similarly. */ | |
175 | ||
176 | static void | |
0c7a8e5a | 177 | mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) |
3c3bdf30 NC |
178 | { |
179 | bfd_set_section_flags (abfd, sec, | |
180 | bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); | |
181 | } | |
182 | ||
183 | /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ | |
184 | ||
185 | static void | |
eaeb0a9d | 186 | gld${EMULATION_NAME}_after_allocation (void) |
3c3bdf30 | 187 | { |
f13a99db | 188 | bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); |
8ded5a0f | 189 | gld${EMULATION_NAME}_map_segments (FALSE); |
3c3bdf30 | 190 | } |
48fa4a5d HPN |
191 | \f |
192 | /* To get on-demand global register allocation right, we need to parse the | |
193 | relocs, like what happens when linking to ELF. It needs to be done | |
194 | before all input sections are supposed to be present. When linking to | |
195 | ELF, it's done when reading symbols. When linking to mmo, we do it | |
196 | when all input files are seen, which is equivalent. */ | |
3c3bdf30 | 197 | |
48fa4a5d | 198 | static void |
0c7a8e5a | 199 | mmo_after_open (void) |
48fa4a5d | 200 | { |
1c5e6447 HPN |
201 | /* When there's a mismatch between the output format and the emulation |
202 | (using weird combinations like "-m mmo --oformat elf64-mmix" for | |
203 | example), we'd count relocs twice because they'd also be counted | |
204 | along the usual route for ELF-only linking, which would lead to an | |
205 | internal accounting error. */ | |
f13a99db | 206 | if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) |
48fa4a5d | 207 | { |
1c5e6447 HPN |
208 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
209 | { | |
210 | if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour | |
211 | && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) | |
212 | einfo ("%X%P: Internal problems scanning %B after opening it", | |
213 | is->the_bfd); | |
214 | } | |
48fa4a5d | 215 | } |
5c3049d2 | 216 | after_open_default (); |
48fa4a5d | 217 | } |
3c3bdf30 NC |
218 | EOF |
219 | ||
220 | LDEMUL_PLACE_ORPHAN=mmo_place_orphan | |
48fa4a5d | 221 | LDEMUL_AFTER_OPEN=mmo_after_open |