1# This shell script emits a C file. -*- C -*- 2# Copyright (C) 2001-2015 Free Software Foundation, Inc. 3# 4# This file is part of the GNU Binutils. 5# 6# This program is free software; you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation; either version 3 of the License, or 9# (at your option) any later version. 10# 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15# 16# You should have received a copy of the GNU General Public License 17# along with this program; if not, write to the Free Software 18# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19# MA 02110-1301, USA. 20# 21 22# This file is sourced from generic.em. 23 24fragment <<EOF 25/* Need to have this macro defined before mmix-elfnmmo, which uses the 26 name for the before_allocation function, defined in ldemul.c (for 27 the mmo "emulation") or in elf32.em (for the elf64mmix 28 "emulation"). */ 29#define gldmmo_before_allocation before_allocation_default 30 31/* We include this header *not* because we expect to handle ELF here 32 but because we re-use the map_segments function in elf-generic.em, 33 a file which is rightly somewhat ELF-centric. But this is only to 34 get a weird testcase right; ld-mmix/bpo-22, forcing ELF to be 35 output from the mmo emulation: -m mmo --oformat elf64-mmix! */ 36#include "elf-bfd.h" 37 38static void gld${EMULATION_NAME}_after_allocation (void); 39EOF 40 41source_em ${srcdir}/emultempl/elf-generic.em 42source_em ${srcdir}/emultempl/mmix-elfnmmo.em 43 44fragment <<EOF 45 46/* Place an orphan section. We use this to put random SEC_CODE or 47 SEC_READONLY sections right after MMO_TEXT_SECTION_NAME. Much borrowed 48 from elf32.em. */ 49 50static lang_output_section_statement_type * 51mmo_place_orphan (asection *s, 52 const char *secname, 53 int constraint ATTRIBUTE_UNUSED) 54{ 55 static struct 56 { 57 flagword nonzero_flags; 58 struct orphan_save orphansave; 59 } holds[] = 60 { 61 { 62 SEC_CODE | SEC_READONLY, 63 { 64 MMO_TEXT_SECTION_NAME, 65 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE, 66 0, 0, 0, 0 67 } 68 }, 69 { 70 SEC_LOAD | SEC_DATA, 71 { 72 MMO_DATA_SECTION_NAME, 73 SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_DATA, 74 0, 0, 0, 0 75 } 76 }, 77 { 78 SEC_ALLOC, 79 { 80 ".bss", 81 SEC_ALLOC, 82 0, 0, 0, 0 83 } 84 } 85 }; 86 87 struct orphan_save *place = NULL; 88 lang_output_section_statement_type *after; 89 lang_output_section_statement_type *os; 90 size_t i; 91 flagword flags; 92 asection *nexts; 93 94 /* We have nothing to say for anything other than a final link or 95 for sections that are excluded. */ 96 if (bfd_link_relocatable (&link_info) 97 || (s->flags & SEC_EXCLUDE) != 0) 98 return NULL; 99 100 os = lang_output_section_find (secname); 101 102 /* We have an output section by this name. Place the section inside it 103 (regardless of whether the linker script lists it as input). */ 104 if (os != NULL) 105 { 106 lang_add_section (&os->children, s, NULL, os); 107 return os; 108 } 109 110 /* Check for matching section type flags for sections we care about. 111 A section without contents can have SEC_LOAD == 0, but we still 112 want it attached to a sane section so the symbols appear as 113 expected. */ 114 flags = s->flags; 115 nexts = s; 116 while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts)) != NULL) 117 if (nexts->output_section == NULL 118 && (nexts->flags & SEC_EXCLUDE) == 0 119 && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0 120 && (nexts->owner->flags & DYNAMIC) == 0 121 && nexts->owner->usrdata != NULL 122 && !(((lang_input_statement_type *) nexts->owner->usrdata) 123 ->flags.just_syms)) 124 flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY)) 125 ^ SEC_READONLY); 126 if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY) 127 for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++) 128 if ((flags & holds[i].nonzero_flags) != 0) 129 { 130 place = &holds[i].orphansave; 131 if (place->os == NULL) 132 place->os = lang_output_section_find (place->name); 133 break; 134 } 135 136 if (place == NULL) 137 { 138 /* For other combinations, we have to give up, except we make 139 sure not to place the orphan section after the 140 linker-generated register section; that'd make it continue 141 the reg section and we never want that to happen for orphan 142 sections. */ 143 lang_output_section_statement_type *before; 144 lang_output_section_statement_type *lookup; 145 static struct orphan_save hold_nonreg = 146 { 147 NULL, 148 SEC_READONLY, 149 0, 0, 0, 0 150 }; 151 152 if (hold_nonreg.os == NULL) 153 { 154 before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME); 155 156 /* If we have no such section, all fine; we don't care where 157 it's placed. */ 158 if (before == NULL) 159 return NULL; 160 161 /* We have to find the oss before this one, so we can use that as 162 "after". */ 163 for (lookup = &lang_output_section_statement.head->output_section_statement; 164 lookup != NULL && lookup->next != before; 165 lookup = lookup->next) 166 ; 167 168 hold_nonreg.os = lookup; 169 } 170 171 place = &hold_nonreg; 172 } 173 174 after = place->os; 175 if (after == NULL) 176 return NULL; 177 178 /* If there's an output section by *this* name, we'll use it, regardless 179 of actual section flags, in contrast to what's done in elf32.em. */ 180 os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); 181 182 return os; 183} 184 185/* Remove the spurious settings of SEC_RELOC that make it to the output at 186 link time. We are as confused as elflink.h:elf_bfd_final_link, and 187 paper over the bug similarly. */ 188 189static void 190mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) 191{ 192 bfd_set_section_flags (abfd, sec, 193 bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); 194} 195 196/* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ 197 198static void 199gld${EMULATION_NAME}_after_allocation (void) 200{ 201 bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); 202 gld${EMULATION_NAME}_map_segments (FALSE); 203} 204 205/* To get on-demand global register allocation right, we need to parse the 206 relocs, like what happens when linking to ELF. It needs to be done 207 before all input sections are supposed to be present. When linking to 208 ELF, it's done when reading symbols. When linking to mmo, we do it 209 when all input files are seen, which is equivalent. */ 210 211static void 212mmo_after_open (void) 213{ 214 /* When there's a mismatch between the output format and the emulation 215 (using weird combinations like "-m mmo --oformat elf64-mmix" for 216 example), we'd count relocs twice because they'd also be counted 217 along the usual route for ELF-only linking, which would lead to an 218 internal accounting error. */ 219 if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) 220 { 221 LANG_FOR_EACH_INPUT_STATEMENT (is) 222 { 223 if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour 224 && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) 225 einfo ("%X%P: Internal problems scanning %B after opening it", 226 is->the_bfd); 227 } 228 } 229 after_open_default (); 230} 231EOF 232 233LDEMUL_PLACE_ORPHAN=mmo_place_orphan 234LDEMUL_AFTER_OPEN=mmo_after_open 235