1 # This shell script emits a C file. -*- C -*-
2 # Copyright (C) 2001-2016 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);
110 /* Check for matching section type flags for sections we care about.
111 A section without contents can have SEC_LOAD == 0, but we still
112 want it attached to a sane section so the symbols appear as
116 while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts)) != NULL)
117 if (nexts->output_section == NULL
118 && (nexts->flags & SEC_EXCLUDE) == 0
119 && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0
120 && (nexts->owner->flags & DYNAMIC) == 0
121 && nexts->owner->usrdata != NULL
122 && !(((lang_input_statement_type *) nexts->owner->usrdata)
124 flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY))
126 if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY)
127 for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++)
128 if ((flags & holds[i].nonzero_flags) != 0)
130 place = &holds[i].orphansave;
131 if (place->os == NULL)
132 place->os = lang_output_section_find (place->name);
138 /* For other combinations, we have to give up, except we make
139 sure not to place the orphan section after the
140 linker-generated register section; that'd make it continue
141 the reg section and we never want that to happen for orphan
143 lang_output_section_statement_type *before;
144 lang_output_section_statement_type *lookup;
145 static struct orphan_save hold_nonreg =
152 if (hold_nonreg.os == NULL)
154 before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME);
156 /* If we have no such section, all fine; we don't care where
161 /* We have to find the oss before this one, so we can use that as
163 for (lookup = &lang_output_section_statement.head->output_section_statement;
164 lookup != NULL && lookup->next != before;
165 lookup = lookup->next)
168 hold_nonreg.os = lookup;
171 place = &hold_nonreg;
178 /* If there's an output section by *this* name, we'll use it, regardless
179 of actual section flags, in contrast to what's done in elf32.em. */
180 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL);
185 /* Remove the spurious settings of SEC_RELOC that make it to the output at
186 link time. We are as confused as elflink.h:elf_bfd_final_link, and
187 paper over the bug similarly. */
190 mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
192 bfd_set_section_flags (abfd, sec,
193 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
196 /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
199 gld${EMULATION_NAME}_after_allocation (void)
201 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL);
202 gld${EMULATION_NAME}_map_segments (FALSE);
205 /* To get on-demand global register allocation right, we need to parse the
206 relocs, like what happens when linking to ELF. It needs to be done
207 before all input sections are supposed to be present. When linking to
208 ELF, it's done when reading symbols. When linking to mmo, we do it
209 when all input files are seen, which is equivalent. */
212 mmo_after_open (void)
214 /* When there's a mismatch between the output format and the emulation
215 (using weird combinations like "-m mmo --oformat elf64-mmix" for
216 example), we'd count relocs twice because they'd also be counted
217 along the usual route for ELF-only linking, which would lead to an
218 internal accounting error. */
219 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
221 LANG_FOR_EACH_INPUT_STATEMENT (is)
223 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
224 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
225 einfo ("%X%P: Internal problems scanning %B after opening it",
229 after_open_default ();
233 LDEMUL_PLACE_ORPHAN=mmo_place_orphan
234 LDEMUL_AFTER_OPEN=mmo_after_open