| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2001-2020 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 elf.em and mmo.em, used to define |
| 23 | # MMIX-specific things common to ELF and MMO. |
| 24 | |
| 25 | fragment <<EOF |
| 26 | #include "elf/mmix.h" |
| 27 | |
| 28 | static void gld${EMULATION_NAME}_before_parse (void); |
| 29 | |
| 30 | static void |
| 31 | mmix_before_parse (void) |
| 32 | { |
| 33 | link_info.check_relocs_after_open_input = TRUE; |
| 34 | gld${EMULATION_NAME}_before_parse (); |
| 35 | } |
| 36 | |
| 37 | /* Set up handling of linker-allocated global registers. */ |
| 38 | |
| 39 | static void |
| 40 | mmix_before_allocation (void) |
| 41 | { |
| 42 | /* Call the default first. */ |
| 43 | gld${EMULATION_NAME}_before_allocation (); |
| 44 | |
| 45 | /* There's a needrelax.em which uses this ..._before_allocation-hook and |
| 46 | just has the statement below as payload. It's more of a hassle to |
| 47 | use that than to just include these two lines and take the |
| 48 | maintenance burden to keep them in sync. (Of course we lose the |
| 49 | maintenance burden of checking that it still does what we need.) */ |
| 50 | |
| 51 | /* Force -relax on (regardless of whether we're doing a relocatable |
| 52 | link). */ |
| 53 | ENABLE_RELAXATION; |
| 54 | |
| 55 | if (!_bfd_mmix_before_linker_allocation (link_info.output_bfd, &link_info)) |
| 56 | einfo (_("%X%P: internal problems setting up section %s"), |
| 57 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 58 | } |
| 59 | |
| 60 | /* We need to set the VMA of the .MMIX.reg_contents section when it has |
| 61 | been allocated, and produce the final settings for the linker-generated |
| 62 | GREGs. */ |
| 63 | |
| 64 | static void |
| 65 | mmix_after_allocation (void) |
| 66 | { |
| 67 | asection *sec; |
| 68 | bfd_signed_vma regvma; |
| 69 | |
| 70 | gld${EMULATION_NAME}_after_allocation (); |
| 71 | |
| 72 | /* If there's no register section, we don't need to do anything. On the |
| 73 | other hand, if there's a non-standard linker-script without a mapping |
| 74 | from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is |
| 75 | present (as in the ld test "NOCROSSREFS 2"), that section (1) will be |
| 76 | orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we |
| 77 | will not do the necessary preparations for those relocations that |
| 78 | caused it to be created. We'll SEGV from the latter error. The |
| 79 | former error in separation will result in a non-working binary, but |
| 80 | that's expected when you play tricks with linker scripts. The |
| 81 | "NOCROSSREFS 2" test does not run the output so it does not matter |
| 82 | there. */ |
| 83 | sec = bfd_get_section_by_name (link_info.output_bfd, |
| 84 | MMIX_REG_CONTENTS_SECTION_NAME); |
| 85 | if (sec == NULL) |
| 86 | sec |
| 87 | = bfd_get_section_by_name (link_info.output_bfd, |
| 88 | MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); |
| 89 | if (sec == NULL) |
| 90 | return; |
| 91 | |
| 92 | regvma = 256 * 8 - sec->size - 8; |
| 93 | |
| 94 | /* If we start on a local register, we have too many global registers. |
| 95 | We treat this error as nonfatal (meaning processing will continue in |
| 96 | search for other errors), because it's a link error in the same way |
| 97 | as an undefined symbol. */ |
| 98 | if (regvma < 32 * 8) |
| 99 | { |
| 100 | einfo (_("%X%P: too many global registers: %u, max 223\n"), |
| 101 | (unsigned) sec->size / 8); |
| 102 | regvma = 32 * 8; |
| 103 | } |
| 104 | |
| 105 | /* Set vma to correspond to first such register number * 8. */ |
| 106 | bfd_set_section_vma (sec, (bfd_vma) regvma); |
| 107 | |
| 108 | /* Simplify symbol output for the register section (without contents; |
| 109 | created for register symbols) by setting the output offset to 0. |
| 110 | This section is only present when there are register symbols. */ |
| 111 | sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME); |
| 112 | if (sec != NULL) |
| 113 | bfd_set_section_vma (sec, 0); |
| 114 | |
| 115 | if (!_bfd_mmix_after_linker_allocation (link_info.output_bfd, &link_info)) |
| 116 | { |
| 117 | /* This is a fatal error; make einfo call not return. */ |
| 118 | einfo (_("%F%P: can't finalize linker-allocated global registers\n")); |
| 119 | } |
| 120 | } |
| 121 | EOF |
| 122 | |
| 123 | LDEMUL_BEFORE_PARSE=mmix_before_parse |
| 124 | LDEMUL_AFTER_ALLOCATION=mmix_after_allocation |
| 125 | LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation |