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 elf.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 use the map_segments function. But this is only to
33 get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be
34 output from the mmo emulation: -m mmo --oformat elf64-mmix! */
37 static void gld${EMULATION_NAME}_after_allocation (void);
40 source_em ${srcdir}/emultempl/elf-generic.em
41 source_em ${srcdir}/emultempl/mmix-elfnmmo.em
45 /* Place an orphan section. We use this to put random SEC_CODE or
46 SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
49 static lang_output_section_statement_type *
50 mmo_place_orphan (asection *s,
52 int constraint ATTRIBUTE_UNUSED)
56 flagword nonzero_flags;
57 struct orphan_save orphansave;
61 SEC_CODE | SEC_READONLY,
63 MMO_TEXT_SECTION_NAME,
64 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
71 MMO_DATA_SECTION_NAME,
72 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
86 struct orphan_save *place = NULL;
87 lang_output_section_statement_type *after;
88 lang_output_section_statement_type *os;
93 /* We have nothing to say for anything other than a final link or
94 for sections that are excluded. */
95 if (bfd_link_relocatable (&link_info)
96 || (s->flags & SEC_EXCLUDE) != 0)
99 os = lang_output_section_find (secname);
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). */
105 lang_add_section (&os->children, s, NULL, os);
110 if (!bfd_link_relocatable (&link_info))
113 while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts))
115 if (nexts->output_section == NULL
116 && (nexts->flags & SEC_EXCLUDE) == 0
117 && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0
118 && (nexts->owner->flags & DYNAMIC) == 0
119 && nexts->owner->usrdata != NULL
120 && !(((lang_input_statement_type *) nexts->owner->usrdata)
122 flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY))
126 /* Check for matching section type flags for sections we care about.
127 A section without contents can have SEC_LOAD == 0, but we still
128 want it attached to a sane section so the symbols appear as
131 if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY)
132 for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++)
133 if ((flags & holds[i].nonzero_flags) != 0)
135 place = &holds[i].orphansave;
136 if (place->os == NULL)
137 place->os = lang_output_section_find (place->name);
143 /* For other combinations, we have to give up, except we make
144 sure not to place the orphan section after the
145 linker-generated register section; that'd make it continue
146 the reg section and we never want that to happen for orphan
148 lang_output_section_statement_type *before;
149 lang_output_section_statement_type *lookup;
150 static struct orphan_save hold_nonreg =
157 if (hold_nonreg.os == NULL)
159 before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME);
161 /* If we have no such section, all fine; we don't care where
166 /* We have to find the oss before this one, so we can use that as
168 for (lookup = &lang_os_list.head->output_section_statement;
169 lookup != NULL && lookup->next != before;
170 lookup = lookup->next)
173 hold_nonreg.os = lookup;
176 place = &hold_nonreg;
183 /* If there's an output section by *this* name, we'll use it, regardless
184 of actual section flags, in contrast to what's done in elf.em. */
185 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL);
190 /* Remove the spurious settings of SEC_RELOC that make it to the output at
191 link time. We are as confused as elflink.h:elf_bfd_final_link, and
192 paper over the bug similarly. */
195 mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
197 bfd_set_section_flags (abfd, sec,
198 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
201 /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
204 gld${EMULATION_NAME}_after_allocation (void)
206 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL);
207 ldelf_map_segments (FALSE);
210 /* To get on-demand global register allocation right, we need to parse the
211 relocs, like what happens when linking to ELF. It needs to be done
212 before all input sections are supposed to be present. When linking to
213 ELF, it's done when reading symbols. When linking to mmo, we do it
214 when all input files are seen, which is equivalent. */
217 mmo_after_open (void)
219 /* When there's a mismatch between the output format and the emulation
220 (using weird combinations like "-m mmo --oformat elf64-mmix" for
221 example), we'd count relocs twice because they'd also be counted
222 along the usual route for ELF-only linking, which would lead to an
223 internal accounting error. */
224 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
226 LANG_FOR_EACH_INPUT_STATEMENT (is)
228 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
229 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
230 einfo (_("%X%P: internal problems scanning %pB after opening it"),
234 after_open_default ();
238 LDEMUL_PLACE_ORPHAN=mmo_place_orphan
239 LDEMUL_AFTER_OPEN=mmo_after_open