1# This shell script emits a C file. -*- C -*- 2# Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 3# Free Software Foundation, Inc. 4# 5# This file is part of the GNU Binutils. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 3 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20# MA 02110-1301, USA. 21# 22 23# This file is sourced from generic.em. 24 25fragment <<EOF 26/* Need to have this macro defined before mmix-elfnmmo, which uses the 27 name for the before_allocation function, defined in ldemul.c (for 28 the mmo "emulation") or in elf32.em (for the elf64mmix 29 "emulation"). */ 30#define gldmmo_before_allocation before_allocation_default 31 32/* We include this header *not* because we expect to handle ELF here 33 but because we re-use the map_segments function in elf-generic.em, 34 a file which is rightly somewhat ELF-centric. But this is only to 35 get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be 36 output from the mmo emulation: -m mmo --oformat elf64-mmix! */ 37#include "elf-bfd.h" 38 39static void gld${EMULATION_NAME}_after_allocation (void); 40EOF 41 42source_em ${srcdir}/emultempl/elf-generic.em 43source_em ${srcdir}/emultempl/mmix-elfnmmo.em 44 45fragment <<EOF 46 47/* Place an orphan section. We use this to put random SEC_CODE or 48 SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed 49 from elf32.em. */ 50 51static lang_output_section_statement_type * 52mmo_place_orphan (asection *s, 53 const char *secname, 54 int constraint ATTRIBUTE_UNUSED) 55{ 56 static struct orphan_save hold_text = 57 { 58 MMO_TEXT_SECTION_NAME, 59 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, 60 0, 0, 0, 0 61 }; 62 struct orphan_save *place; 63 lang_output_section_statement_type *after; 64 lang_output_section_statement_type *os; 65 66 /* We have nothing to say for anything other than a final link. */ 67 if (link_info.relocatable 68 || (s->flags & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD) 69 return NULL; 70 71 /* Only care for sections we're going to load. */ 72 os = lang_output_section_find (secname); 73 74 /* We have an output section by this name. Place the section inside it 75 (regardless of whether the linker script lists it as input). */ 76 if (os != NULL) 77 { 78 lang_add_section (&os->children, s, os); 79 return os; 80 } 81 82 /* If this section does not have .text-type section flags or there's no 83 MMO_TEXT_SECTION_NAME, we don't have anything to say. */ 84 if ((s->flags & (SEC_CODE | SEC_READONLY)) == 0) 85 return NULL; 86 87 if (hold_text.os == NULL) 88 hold_text.os = lang_output_section_find (hold_text.name); 89 90 place = &hold_text; 91 if (hold_text.os != NULL) 92 after = hold_text.os; 93 else 94 after = &lang_output_section_statement.head->output_section_statement; 95 96 /* If there's an output section by this name, we'll use it, regardless 97 of section flags, in contrast to what's done in elf32.em. */ 98 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); 99 100 /* We need an output section for .text as a root, so if there was none 101 (might happen with a peculiar linker script such as in "map 102 addresses", map-address.exp), we grab the output section created 103 above. */ 104 if (hold_text.os == NULL) 105 hold_text.os = os; 106 107 return os; 108} 109 110/* Remove the spurious settings of SEC_RELOC that make it to the output at 111 link time. We are as confused as elflink.h:elf_bfd_final_link, and 112 paper over the bug similarly. */ 113 114static void 115mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) 116{ 117 bfd_set_section_flags (abfd, sec, 118 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); 119} 120 121/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ 122 123static void 124gld${EMULATION_NAME}_after_allocation (void) 125{ 126 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); 127 gld${EMULATION_NAME}_map_segments (FALSE); 128} 129 130/* To get on-demand global register allocation right, we need to parse the 131 relocs, like what happens when linking to ELF. It needs to be done 132 before all input sections are supposed to be present. When linking to 133 ELF, it's done when reading symbols. When linking to mmo, we do it 134 when all input files are seen, which is equivalent. */ 135 136static void 137mmo_after_open (void) 138{ 139 /* When there's a mismatch between the output format and the emulation 140 (using weird combinations like "-m mmo --oformat elf64-mmix" for 141 example), we'd count relocs twice because they'd also be counted 142 along the usual route for ELF-only linking, which would lead to an 143 internal accounting error. */ 144 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) 145 { 146 LANG_FOR_EACH_INPUT_STATEMENT (is) 147 { 148 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour 149 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) 150 einfo ("%X%P: Internal problems scanning %B after opening it", 151 is->the_bfd); 152 } 153 } 154 after_open_default (); 155} 156EOF 157 158LDEMUL_PLACE_ORPHAN=mmo_place_orphan 159LDEMUL_AFTER_OPEN=mmo_after_open 160