| # This shell script emits a C file. -*- C -*- |
| # Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
| # |
| # This file is part of GLD, the Gnu Linker. |
| # |
| # 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 2 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 |
| # linker MMIX-specifics common to ELF and MMO. |
| |
| cat >>e${EMULATION_NAME}.c <<EOF |
| /* Need to have this define before mmix-elfnmmo, which includes |
| needrelax.em which uses this name for the before_allocation function, |
| normally defined in elf32.em. */ |
| #define gldmmo_before_allocation before_allocation_default |
| EOF |
| |
| . ${srcdir}/emultempl/mmix-elfnmmo.em |
| |
| cat >>e${EMULATION_NAME}.c <<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 bfd_boolean |
| mmo_place_orphan (lang_input_statement_type *file, asection *s) |
| { |
| 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; |
| const char *secname; |
| 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 FALSE; |
| |
| /* Only care for sections we're going to load. */ |
| secname = s->name; |
| 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, file); |
| return TRUE; |
| } |
| |
| /* 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 FALSE; |
| |
| 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 (file, s, secname, 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 TRUE; |
| } |
| |
| /* 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 |
| mmo_finish (void) |
| { |
| bfd_map_over_sections (output_bfd, mmo_wipe_sec_reloc_flag, NULL); |
| finish_default (); |
| } |
| |
| /* 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 (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_FINISH=mmo_finish |
| LDEMUL_AFTER_OPEN=mmo_after_open |