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# This shell script emits a C file. -*- C -*-
# Copyright (C) 2001-2015 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This file is sourced from elf32.em and mmo.em, used to define
# MMIX-specific things common to ELF and MMO.
fragment <<EOF
#include "elf/mmix.h"
/* Set up handling of linker-allocated global registers. */
static void
mmix_before_allocation (void)
{
/* Call the default first. */
gld${EMULATION_NAME}_before_allocation ();
/* There's a needrelax.em which uses this ..._before_allocation-hook and
just has the statement below as payload. It's more of a hassle to
use that than to just include these two lines and take the
maintenance burden to keep them in sync. (Of course we lose the
maintenance burden of checking that it still does what we need.) */
/* Force -relax on (regardless of whether we're doing a relocatable
link). */
ENABLE_RELAXATION;
if (!_bfd_mmix_before_linker_allocation (link_info.output_bfd, &link_info))
einfo ("%X%P: Internal problems setting up section %s",
MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
}
/* We need to set the VMA of the .MMIX.reg_contents section when it has
been allocated, and produce the final settings for the linker-generated
GREGs. */
static void
mmix_after_allocation (void)
{
asection *sec;
bfd_signed_vma regvma;
gld${EMULATION_NAME}_after_allocation ();
/* If there's no register section, we don't need to do anything. On the
other hand, if there's a non-standard linker-script without a mapping
from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is
present (as in the ld test "NOCROSSREFS 2"), that section (1) will be
orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we
will not do the necessary preparations for those relocations that
caused it to be created. We'll SEGV from the latter error. The
former error in separation will result in a non-working binary, but
that's expected when you play tricks with linker scripts. The
"NOCROSSREFS 2" test does not run the output so it does not matter
there. */
sec = bfd_get_section_by_name (link_info.output_bfd,
MMIX_REG_CONTENTS_SECTION_NAME);
if (sec == NULL)
sec
= bfd_get_section_by_name (link_info.output_bfd,
MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
if (sec == NULL)
return;
regvma = 256 * 8 - sec->size - 8;
/* If we start on a local register, we have too many global registers.
We treat this error as nonfatal (meaning processing will continue in
search for other errors), because it's a link error in the same way
as an undefined symbol. */
if (regvma < 32 * 8)
{
einfo ("%X%P: Too many global registers: %u, max 223\n",
(unsigned) sec->size / 8);
regvma = 32 * 8;
}
/* Set vma to correspond to first such register number * 8. */
bfd_set_section_vma (link_info.output_bfd, sec, (bfd_vma) regvma);
/* Simplify symbol output for the register section (without contents;
created for register symbols) by setting the output offset to 0.
This section is only present when there are register symbols. */
sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME);
if (sec != NULL)
bfd_set_section_vma (sec->owner, sec, 0);
if (!_bfd_mmix_after_linker_allocation (link_info.output_bfd, &link_info))
{
/* This is a fatal error; make einfo call not return. */
einfo ("%F%P: Can't finalize linker-allocated global registers\n");
}
}
EOF
LDEMUL_AFTER_ALLOCATION=mmix_after_allocation
LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation
|
