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112 lines
4.2 KiB
Plaintext
112 lines
4.2 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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#
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# This file is part of GLD, the Gnu Linker.
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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 2 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, MA 02110-1301, USA.
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#
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# This file is sourced from elf32.em and mmo.em, used to define
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# MMIX-specific things common to ELF and MMO.
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "elf/mmix.h"
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/* Set up handling of linker-allocated global registers. */
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static void
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mmix_before_allocation (void)
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{
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/* Call the default first. */
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gld${EMULATION_NAME}_before_allocation ();
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/* There's a needrelax.em which uses this ..._before_allocation-hook and
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just has the statement below as payload. It's more of a hassle to
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use that than to just include these two lines and take the
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maintenance burden to keep them in sync. (Of course we lose the
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maintenance burden of checking that it still does what we need.) */
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/* Force -relax on (regardless of whether we're doing a relocatable
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link). */
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command_line.relax = TRUE;
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if (!_bfd_mmix_before_linker_allocation (output_bfd, &link_info))
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einfo ("%X%P: Internal problems setting up section %s",
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MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
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}
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/* We need to set the VMA of the .MMIX.reg_contents section when it has
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been allocated, and produce the final settings for the linker-generated
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GREGs. */
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static void
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mmix_after_allocation (void)
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{
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asection *sec
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= bfd_get_section_by_name (output_bfd, MMIX_REG_CONTENTS_SECTION_NAME);
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bfd_signed_vma regvma;
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/* If there's no register section, we don't need to do anything. On the
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other hand, if there's a non-standard linker-script without a mapping
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from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is
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present (as in the ld test "NOCROSSREFS 2"), that section (1) will be
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orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we
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will not do the necessary preparations for those relocations that
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caused it to be created. We'll SEGV from the latter error. The
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former error in separation will result in a non-working binary, but
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that's expected when you play tricks with linker scripts. The
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"NOCROSSREFS 2" test does not run the output so it does not matter
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there. */
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if (sec == NULL)
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sec
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= bfd_get_section_by_name (output_bfd,
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MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME);
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if (sec == NULL)
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return;
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regvma = 256 * 8 - sec->size - 8;
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/* If we start on a local register, we have too many global registers.
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We treat this error as nonfatal (meaning processing will continue in
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search for other errors), because it's a link error in the same way
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as an undefined symbol. */
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if (regvma < 32 * 8)
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{
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einfo ("%X%P: Too many global registers: %u, max 223\n",
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(unsigned) sec->size / 8);
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regvma = 32 * 8;
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}
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/* Set vma to correspond to first such register number * 8. */
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bfd_set_section_vma (output_bfd, sec, (bfd_vma) regvma);
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/* Simplify symbol output for the register section (without contents;
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created for register symbols) by setting the output offset to 0.
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This section is only present when there are register symbols. */
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sec = bfd_get_section_by_name (output_bfd, MMIX_REG_SECTION_NAME);
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if (sec != NULL)
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bfd_set_section_vma (abfd, sec, 0);
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if (!_bfd_mmix_after_linker_allocation (output_bfd, &link_info))
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{
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/* This is a fatal error; make einfo call not return. */
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einfo ("%F%P: Can't finalize linker-allocated global registers\n");
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}
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}
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EOF
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LDEMUL_AFTER_ALLOCATION=mmix_after_allocation
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LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation
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