diff options
Diffstat (limited to 'binutils-2.21/ld/emultempl/mmo.em')
| -rw-r--r-- | binutils-2.21/ld/emultempl/mmo.em | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/binutils-2.21/ld/emultempl/mmo.em b/binutils-2.21/ld/emultempl/mmo.em new file mode 100644 index 0000000..d1a6f14 --- /dev/null +++ b/binutils-2.21/ld/emultempl/mmo.em @@ -0,0 +1,158 @@ +# This shell script emits a C file. -*- C -*- +# Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 +# 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 generic.em. + +fragment <<EOF +/* Need to have this macro defined before mmix-elfnmmo, which uses the + name for the before_allocation function, defined in ldemul.c (for + the mmo "emulation") or in elf32.em (for the elf64mmix + "emulation"). */ +#define gldmmo_before_allocation before_allocation_default + +/* We include this header *not* because we expect to handle ELF here + but because we re-use the map_segments function in elf-generic.em, + a file which is rightly somewhat ELF-centric. But this is only to + get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be + output from the mmo emulation: -m mmo --oformat elf64-mmix! */ +#include "elf-bfd.h" + +static void gld${EMULATION_NAME}_after_allocation (void); +EOF + +source_em ${srcdir}/emultempl/elf-generic.em +source_em ${srcdir}/emultempl/mmix-elfnmmo.em + +fragment <<EOF + +/* Place an orphan section. We use this to put random SEC_CODE or + SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed + from elf32.em. */ + +static lang_output_section_statement_type * +mmo_place_orphan (asection *s, + const char *secname, + int constraint ATTRIBUTE_UNUSED) +{ + static struct orphan_save hold_text = + { + MMO_TEXT_SECTION_NAME, + SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, + 0, 0, 0, 0 + }; + struct orphan_save *place; + lang_output_section_statement_type *after; + lang_output_section_statement_type *os; + + /* We have nothing to say for anything other than a final link. */ + if (link_info.relocatable + || (s->flags & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD) + return NULL; + + /* Only care for sections we're going to load. */ + os = lang_output_section_find (secname); + + /* We have an output section by this name. Place the section inside it + (regardless of whether the linker script lists it as input). */ + if (os != NULL) + { + lang_add_section (&os->children, s, os); + return os; + } + + /* If this section does not have .text-type section flags or there's no + MMO_TEXT_SECTION_NAME, we don't have anything to say. */ + if ((s->flags & (SEC_CODE | SEC_READONLY)) == 0) + return NULL; + + if (hold_text.os == NULL) + hold_text.os = lang_output_section_find (hold_text.name); + + place = &hold_text; + if (hold_text.os != NULL) + after = hold_text.os; + else + after = &lang_output_section_statement.head->output_section_statement; + + /* If there's an output section by this name, we'll use it, regardless + of section flags, in contrast to what's done in elf32.em. */ + os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); + + /* We need an output section for .text as a root, so if there was none + (might happen with a peculiar linker script such as in "map + addresses", map-address.exp), we grab the output section created + above. */ + if (hold_text.os == NULL) + hold_text.os = os; + + return os; +} + +/* Remove the spurious settings of SEC_RELOC that make it to the output at + link time. We are as confused as elflink.h:elf_bfd_final_link, and + paper over the bug similarly. */ + +static void +mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) +{ + bfd_set_section_flags (abfd, sec, + bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); +} + +/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ + +static void +gld${EMULATION_NAME}_after_allocation (void) +{ + bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); + gld${EMULATION_NAME}_map_segments (FALSE); +} + +/* To get on-demand global register allocation right, we need to parse the + relocs, like what happens when linking to ELF. It needs to be done + before all input sections are supposed to be present. When linking to + ELF, it's done when reading symbols. When linking to mmo, we do it + when all input files are seen, which is equivalent. */ + +static void +mmo_after_open (void) +{ + /* When there's a mismatch between the output format and the emulation + (using weird combinations like "-m mmo --oformat elf64-mmix" for + example), we'd count relocs twice because they'd also be counted + along the usual route for ELF-only linking, which would lead to an + internal accounting error. */ + if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) + { + LANG_FOR_EACH_INPUT_STATEMENT (is) + { + if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour + && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) + einfo ("%X%P: Internal problems scanning %B after opening it", + is->the_bfd); + } + } +} +EOF + +LDEMUL_PLACE_ORPHAN=mmo_place_orphan +LDEMUL_AFTER_OPEN=mmo_after_open |