1# This shell script emits a C file. -*- C -*- 2# Copyright 2001, 2002, 2003, 2004, 2006, 2007, 2008 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" 38EOF 39 40source_em ${srcdir}/emultempl/elf-generic.em 41source_em ${srcdir}/emultempl/mmix-elfnmmo.em 42 43fragment <<EOF 44 45/* Place an orphan section. We use this to put random SEC_CODE or 46 SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed 47 from elf32.em. */ 48 49static bfd_boolean 50mmo_place_orphan (asection *s, 51 const char *secname, 52 int constraint ATTRIBUTE_UNUSED) 53{ 54 static struct orphan_save hold_text = 55 { 56 MMO_TEXT_SECTION_NAME, 57 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, 58 0, 0, 0, 0 59 }; 60 struct orphan_save *place; 61 lang_output_section_statement_type *after; 62 lang_output_section_statement_type *os; 63 64 /* We have nothing to say for anything other than a final link. */ 65 if (link_info.relocatable 66 || (s->flags & (SEC_EXCLUDE | SEC_LOAD)) != SEC_LOAD) 67 return FALSE; 68 69 /* Only care for sections we're going to load. */ 70 os = lang_output_section_find (secname); 71 72 /* We have an output section by this name. Place the section inside it 73 (regardless of whether the linker script lists it as input). */ 74 if (os != NULL) 75 { 76 lang_add_section (&os->children, s, os); 77 return TRUE; 78 } 79 80 /* If this section does not have .text-type section flags or there's no 81 MMO_TEXT_SECTION_NAME, we don't have anything to say. */ 82 if ((s->flags & (SEC_CODE | SEC_READONLY)) == 0) 83 return FALSE; 84 85 if (hold_text.os == NULL) 86 hold_text.os = lang_output_section_find (hold_text.name); 87 88 place = &hold_text; 89 if (hold_text.os != NULL) 90 after = hold_text.os; 91 else 92 after = &lang_output_section_statement.head->output_section_statement; 93 94 /* If there's an output section by this name, we'll use it, regardless 95 of section flags, in contrast to what's done in elf32.em. */ 96 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); 97 98 /* We need an output section for .text as a root, so if there was none 99 (might happen with a peculiar linker script such as in "map 100 addresses", map-address.exp), we grab the output section created 101 above. */ 102 if (hold_text.os == NULL) 103 hold_text.os = os; 104 105 return TRUE; 106} 107 108/* Remove the spurious settings of SEC_RELOC that make it to the output at 109 link time. We are as confused as elflink.h:elf_bfd_final_link, and 110 paper over the bug similarly. */ 111 112static void 113mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) 114{ 115 bfd_set_section_flags (abfd, sec, 116 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); 117} 118 119/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ 120 121static void 122mmo_finish (void) 123{ 124 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); 125 gld${EMULATION_NAME}_map_segments (FALSE); 126 finish_default (); 127} 128 129/* To get on-demand global register allocation right, we need to parse the 130 relocs, like what happens when linking to ELF. It needs to be done 131 before all input sections are supposed to be present. When linking to 132 ELF, it's done when reading symbols. When linking to mmo, we do it 133 when all input files are seen, which is equivalent. */ 134 135static void 136mmo_after_open (void) 137{ 138 /* When there's a mismatch between the output format and the emulation 139 (using weird combinations like "-m mmo --oformat elf64-mmix" for 140 example), we'd count relocs twice because they'd also be counted 141 along the usual route for ELF-only linking, which would lead to an 142 internal accounting error. */ 143 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) 144 { 145 LANG_FOR_EACH_INPUT_STATEMENT (is) 146 { 147 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour 148 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) 149 einfo ("%X%P: Internal problems scanning %B after opening it", 150 is->the_bfd); 151 } 152 } 153} 154EOF 155 156LDEMUL_PLACE_ORPHAN=mmo_place_orphan 157LDEMUL_FINISH=mmo_finish 158LDEMUL_AFTER_OPEN=mmo_after_open 159