1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2001-2019 Free Software Foundation, Inc.
4 # This file is part of the GNU Binutils.
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.
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.
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,
22 # This file is sourced from generic.em.
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
29 #define gldmmo_before_allocation before_allocation_default
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! */
38 static void gld${EMULATION_NAME}_after_allocation (void);
41 source_em ${srcdir}/emultempl/elf-generic.em
42 source_em ${srcdir}/emultempl/mmix-elfnmmo.em
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
50 static lang_output_section_statement_type *
51 mmo_place_orphan (asection *s,
53 int constraint ATTRIBUTE_UNUSED)
57 flagword nonzero_flags;
58 struct orphan_save orphansave;
62 SEC_CODE | SEC_READONLY,
64 MMO_TEXT_SECTION_NAME,
65 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
72 MMO_DATA_SECTION_NAME,
73 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
87 struct orphan_save *place = NULL;
88 lang_output_section_statement_type *after;
89 lang_output_section_statement_type *os;
94 /* We have nothing to say for anything other than a final link or
95 for sections that are excluded. */
96 if (bfd_link_relocatable (&link_info)
97 || (s->flags & SEC_EXCLUDE) != 0)
100 os = lang_output_section_find (secname);
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). */
106 lang_add_section (&os->children, s, NULL, os);
111 if (!bfd_link_relocatable (&link_info))
114 while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts))
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)
123 flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY))
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
132 if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY)
133 for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++)
134 if ((flags & holds[i].nonzero_flags) != 0)
136 place = &holds[i].orphansave;
137 if (place->os == NULL)
138 place->os = lang_output_section_find (place->name);
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
149 lang_output_section_statement_type *before;
150 lang_output_section_statement_type *lookup;
151 static struct orphan_save hold_nonreg =
158 if (hold_nonreg.os == NULL)
160 before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME);
162 /* If we have no such section, all fine; we don't care where
167 /* We have to find the oss before this one, so we can use that as
169 for (lookup = &lang_output_section_statement.head->output_section_statement;
170 lookup != NULL && lookup->next != before;
171 lookup = lookup->next)
174 hold_nonreg.os = lookup;
177 place = &hold_nonreg;
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. */
186 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL);
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. */
196 mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
198 bfd_set_section_flags (abfd, sec,
199 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
202 /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
205 gld${EMULATION_NAME}_after_allocation (void)
207 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL);
208 gld${EMULATION_NAME}_map_segments (FALSE);
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. */
218 mmo_after_open (void)
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. */
225 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
227 LANG_FOR_EACH_INPUT_STATEMENT (is)
229 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
230 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
231 einfo (_("%X%P: internal problems scanning %pB after opening it"),
235 after_open_default ();
239 LDEMUL_PLACE_ORPHAN=mmo_place_orphan
240 LDEMUL_AFTER_OPEN=mmo_after_open