diff options
Diffstat (limited to 'ld/emultempl/mmix-elfnmmo.em')
| -rw-r--r-- | ld/emultempl/mmix-elfnmmo.em | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/ld/emultempl/mmix-elfnmmo.em b/ld/emultempl/mmix-elfnmmo.em new file mode 100644 index 0000000..5ef5e5e --- /dev/null +++ b/ld/emultempl/mmix-elfnmmo.em @@ -0,0 +1,115 @@ +# This shell script emits a C file. -*- C -*- +# Copyright (C) 2001-2014 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 |