| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2001-2016 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 | |
| 24 | fragment <<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 | |
| 38 | static void gld${EMULATION_NAME}_after_allocation (void); |
| 39 | EOF |
| 40 | |
| 41 | source_em ${srcdir}/emultempl/elf-generic.em |
| 42 | source_em ${srcdir}/emultempl/mmix-elfnmmo.em |
| 43 | |
| 44 | fragment <<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 | |
| 50 | static lang_output_section_statement_type * |
| 51 | mmo_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 | flags = s->flags; |
| 111 | if (!bfd_link_relocatable (&link_info)) |
| 112 | { |
| 113 | nexts = s; |
| 114 | while ((nexts = bfd_get_next_section_by_name (nexts->owner, nexts)) |
| 115 | != NULL) |
| 116 | if (nexts->output_section == NULL |
| 117 | && (nexts->flags & SEC_EXCLUDE) == 0 |
| 118 | && ((nexts->flags ^ flags) & (SEC_LOAD | SEC_ALLOC)) == 0 |
| 119 | && (nexts->owner->flags & DYNAMIC) == 0 |
| 120 | && nexts->owner->usrdata != NULL |
| 121 | && !(((lang_input_statement_type *) nexts->owner->usrdata) |
| 122 | ->flags.just_syms)) |
| 123 | flags = (((flags ^ SEC_READONLY) | (nexts->flags ^ SEC_READONLY)) |
| 124 | ^ SEC_READONLY); |
| 125 | } |
| 126 | |
| 127 | /* Check for matching section type flags for sections we care about. |
| 128 | A section without contents can have SEC_LOAD == 0, but we still |
| 129 | want it attached to a sane section so the symbols appear as |
| 130 | expected. */ |
| 131 | |
| 132 | if ((flags & (SEC_ALLOC | SEC_READONLY)) != SEC_READONLY) |
| 133 | for (i = 0; i < sizeof (holds) / sizeof (holds[0]); i++) |
| 134 | if ((flags & holds[i].nonzero_flags) != 0) |
| 135 | { |
| 136 | place = &holds[i].orphansave; |
| 137 | if (place->os == NULL) |
| 138 | place->os = lang_output_section_find (place->name); |
| 139 | break; |
| 140 | } |
| 141 | |
| 142 | if (place == NULL) |
| 143 | { |
| 144 | /* For other combinations, we have to give up, except we make |
| 145 | sure not to place the orphan section after the |
| 146 | linker-generated register section; that'd make it continue |
| 147 | the reg section and we never want that to happen for orphan |
| 148 | sections. */ |
| 149 | lang_output_section_statement_type *before; |
| 150 | lang_output_section_statement_type *lookup; |
| 151 | static struct orphan_save hold_nonreg = |
| 152 | { |
| 153 | NULL, |
| 154 | SEC_READONLY, |
| 155 | 0, 0, 0, 0 |
| 156 | }; |
| 157 | |
| 158 | if (hold_nonreg.os == NULL) |
| 159 | { |
| 160 | before = lang_output_section_find (MMIX_REG_CONTENTS_SECTION_NAME); |
| 161 | |
| 162 | /* If we have no such section, all fine; we don't care where |
| 163 | it's placed. */ |
| 164 | if (before == NULL) |
| 165 | return NULL; |
| 166 | |
| 167 | /* We have to find the oss before this one, so we can use that as |
| 168 | "after". */ |
| 169 | for (lookup = &lang_output_section_statement.head->output_section_statement; |
| 170 | lookup != NULL && lookup->next != before; |
| 171 | lookup = lookup->next) |
| 172 | ; |
| 173 | |
| 174 | hold_nonreg.os = lookup; |
| 175 | } |
| 176 | |
| 177 | place = &hold_nonreg; |
| 178 | } |
| 179 | |
| 180 | after = place->os; |
| 181 | if (after == NULL) |
| 182 | return NULL; |
| 183 | |
| 184 | /* If there's an output section by *this* name, we'll use it, regardless |
| 185 | of actual section flags, in contrast to what's done in elf32.em. */ |
| 186 | os = lang_insert_orphan (s, secname, 0, after, place, NULL, NULL); |
| 187 | |
| 188 | return os; |
| 189 | } |
| 190 | |
| 191 | /* Remove the spurious settings of SEC_RELOC that make it to the output at |
| 192 | link time. We are as confused as elflink.h:elf_bfd_final_link, and |
| 193 | paper over the bug similarly. */ |
| 194 | |
| 195 | static void |
| 196 | mmo_wipe_sec_reloc_flag (bfd *abfd, asection *sec, void *ptr ATTRIBUTE_UNUSED) |
| 197 | { |
| 198 | bfd_set_section_flags (abfd, sec, |
| 199 | bfd_get_section_flags (abfd, sec) & ~SEC_RELOC); |
| 200 | } |
| 201 | |
| 202 | /* Iterate with bfd_map_over_sections over mmo_wipe_sec_reloc_flag... */ |
| 203 | |
| 204 | static void |
| 205 | gld${EMULATION_NAME}_after_allocation (void) |
| 206 | { |
| 207 | bfd_map_over_sections (link_info.output_bfd, mmo_wipe_sec_reloc_flag, NULL); |
| 208 | gld${EMULATION_NAME}_map_segments (FALSE); |
| 209 | } |
| 210 | \f |
| 211 | /* To get on-demand global register allocation right, we need to parse the |
| 212 | relocs, like what happens when linking to ELF. It needs to be done |
| 213 | before all input sections are supposed to be present. When linking to |
| 214 | ELF, it's done when reading symbols. When linking to mmo, we do it |
| 215 | when all input files are seen, which is equivalent. */ |
| 216 | |
| 217 | static void |
| 218 | mmo_after_open (void) |
| 219 | { |
| 220 | /* When there's a mismatch between the output format and the emulation |
| 221 | (using weird combinations like "-m mmo --oformat elf64-mmix" for |
| 222 | example), we'd count relocs twice because they'd also be counted |
| 223 | along the usual route for ELF-only linking, which would lead to an |
| 224 | internal accounting error. */ |
| 225 | if (bfd_get_flavour (link_info.output_bfd) != bfd_target_elf_flavour) |
| 226 | { |
| 227 | LANG_FOR_EACH_INPUT_STATEMENT (is) |
| 228 | { |
| 229 | if (bfd_get_flavour (is->the_bfd) == bfd_target_elf_flavour |
| 230 | && !_bfd_mmix_check_all_relocs (is->the_bfd, &link_info)) |
| 231 | einfo ("%X%P: Internal problems scanning %B after opening it", |
| 232 | is->the_bfd); |
| 233 | } |
| 234 | } |
| 235 | after_open_default (); |
| 236 | } |
| 237 | EOF |
| 238 | |
| 239 | LDEMUL_PLACE_ORPHAN=mmo_place_orphan |
| 240 | LDEMUL_AFTER_OPEN=mmo_after_open |