221 lines
6.6 KiB
Plaintext
221 lines
6.6 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright (C) 2001-2014 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# This file is sourced from generic.em.
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fragment <<EOF
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/* Need to have this macro defined before mmix-elfnmmo, which uses the
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name for the before_allocation function, defined in ldemul.c (for
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the mmo "emulation") or in elf32.em (for the elf64mmix
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"emulation"). */
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#define gldmmo_before_allocation before_allocation_default
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/* We include this header *not* because we expect to handle ELF here
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but because we re-use the map_segments function in elf-generic.em,
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a file which is rightly somewhat ELF-centric. But this is only to
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get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be
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output from the mmo emulation: -m mmo --oformat elf64-mmix! */
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#include "elf-bfd.h"
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static void gld${EMULATION_NAME}_after_allocation (void);
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EOF
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source_em ${srcdir}/emultempl/elf-generic.em
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source_em ${srcdir}/emultempl/mmix-elfnmmo.em
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fragment <<EOF
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/* Place an orphan section. We use this to put random SEC_CODE or
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SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed
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from elf32.em. */
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static lang_output_section_statement_type *
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mmo_place_orphan (asection *s,
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const char *secname,
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int constraint ATTRIBUTE_UNUSED)
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{
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static struct
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{
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flagword nonzero_flags;
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struct orphan_save orphansave;
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} holds[] =
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{
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{
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SEC_CODE | SEC_READONLY,
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{
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MMO_TEXT_SECTION_NAME,
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SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE,
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0, 0, 0, 0
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}
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},
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{
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SEC_LOAD | SEC_DATA,
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{
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MMO_DATA_SECTION_NAME,
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SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA,
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0, 0, 0, 0
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}
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},
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{
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SEC_ALLOC,
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{
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".bss",
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SEC_ALLOC,
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0, 0, 0, 0
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}
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}
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};
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struct orphan_save *place = NULL;
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lang_output_section_statement_type *after;
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lang_output_section_statement_type *os;
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size_t i;
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/* We have nothing to say for anything other than a final link or
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for sections that are excluded. */
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if (link_info.relocatable
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|| (s->flags & SEC_EXCLUDE) != 0)
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return NULL;
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os = lang_output_section_find (secname);
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/* We have an output section by this name. Place the section inside it
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(regardless of whether the linker script lists it as input). */
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if (os != NULL)
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{
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lang_add_section (&os->children, s, NULL, os);
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return os;
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}
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/* Check for matching section type flags for sections we care about.
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A section without contents can have SEC_LOAD == 0, but we still
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want it attached to a sane section so the symbols appear as
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expected. */
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if ((s->flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY)
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for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++)
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if ((s->flags & holds[i].nonzero_flags) != 0)
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{
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place = &holds[i].orphansave;
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if (place->os == NULL)
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place->os = lang_output_section_find (place->name);
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break;
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}
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if (place == NULL)
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{
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/* For other combinations, we have to give up, except we make
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sure not to place the orphan section after the
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linker-generated register section; that'd make it continue
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the reg section and we never want that to happen for orphan
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sections. */
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lang_output_section_statement_type *before;
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lang_output_section_statement_type *lookup;
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static struct orphan_save hold_nonreg =
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{
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NULL,
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SEC_READONLY,
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0, 0, 0, 0
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};
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if (hold_nonreg.os == NULL)
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{
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before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME);
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/* If we have no such section, all fine; we don't care where
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it's placed. */
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if (before == NULL)
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return NULL;
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/* We have to find the oss before this one, so we can use that as
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"after". */
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for (lookup = &lang_output_section_statement.head->output_section_statement;
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lookup != NULL && lookup->next != before;
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lookup = lookup->next)
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;
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hold_nonreg.os = lookup;
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}
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place = &hold_nonreg;
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}
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after = place->os;
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if (after == NULL)
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return NULL;
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/* If there's an output section by *this* name, we'll use it, regardless
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of actual section flags, in contrast to what's done in elf32.em. */
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os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL);
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return os;
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}
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/* Remove the spurious settings of SEC_RELOC that make it to the output at
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link time. We are as confused as elflink.h:elf_bfd_final_link, and
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paper over the bug similarly. */
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static void
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mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED)
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{
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bfd_set_section_flags (abfd, sec,
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bfd_get_section_flags (abfd, sec) & ~SEC_RELOC);
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}
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/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */
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static void
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gld${EMULATION_NAME}_after_allocation (void)
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{
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bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL);
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gld${EMULATION_NAME}_map_segments (FALSE);
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}
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/* To get on-demand global register allocation right, we need to parse the
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relocs, like what happens when linking to ELF. It needs to be done
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before all input sections are supposed to be present. When linking to
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ELF, it's done when reading symbols. When linking to mmo, we do it
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when all input files are seen, which is equivalent. */
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static void
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mmo_after_open (void)
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{
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/* When there's a mismatch between the output format and the emulation
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(using weird combinations like "-m mmo --oformat elf64-mmix" for
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example), we'd count relocs twice because they'd also be counted
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along the usual route for ELF-only linking, which would lead to an
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internal accounting error. */
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if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour)
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour
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&& !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info))
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einfo ("%X%P: Internal problems scanning %B after opening it",
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is->the_bfd);
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}
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}
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after_open_default ();
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}
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EOF
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LDEMUL_PLACE_ORPHAN=mmo_place_orphan
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LDEMUL_AFTER_OPEN=mmo_after_open
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