1 # This shell script emits a C file. -*- C -*- 2 # Copyright (C) 2001-2014 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 elf32.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 /* Set up handling of linker-allocated global registers. */ 29 30 static void 31 mmix_before_allocation (void) 32 { 33 /* Call the default first. */ 34 gld${EMULATION_NAME}_before_allocation (); 35 36 /* There's a needrelax.em which uses this ..._before_allocation-hook and 37 just has the statement below as payload. It's more of a hassle to 38 use that than to just include these two lines and take the 39 maintenance burden to keep them in sync. (Of course we lose the 40 maintenance burden of checking that it still does what we need.) */ 41 42 /* Force -relax on (regardless of whether we're doing a relocatable 43 link). */ 44 ENABLE_RELAXATION; 45 46 if (!_bfd_mmix_before_linker_allocation (link_info.output_bfd, &link_info)) 47 einfo ("%X%P: Internal problems setting up section %s", 48 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 49 } 50 51 /* We need to set the VMA of the .MMIX.reg_contents section when it has 52 been allocated, and produce the final settings for the linker-generated 53 GREGs. */ 54 55 static void 56 mmix_after_allocation (void) 57 { 58 asection *sec; 59 bfd_signed_vma regvma; 60 61 gld${EMULATION_NAME}_after_allocation (); 62 63 /* If there's no register section, we don't need to do anything. On the 64 other hand, if there's a non-standard linker-script without a mapping 65 from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is 66 present (as in the ld test "NOCROSSREFS 2"), that section (1) will be 67 orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we 68 will not do the necessary preparations for those relocations that 69 caused it to be created. We'll SEGV from the latter error. The 70 former error in separation will result in a non-working binary, but 71 that's expected when you play tricks with linker scripts. The 72 "NOCROSSREFS 2" test does not run the output so it does not matter 73 there. */ 74 sec = bfd_get_section_by_name (link_info.output_bfd, 75 MMIX_REG_CONTENTS_SECTION_NAME); 76 if (sec == NULL) 77 sec 78 = bfd_get_section_by_name (link_info.output_bfd, 79 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 80 if (sec == NULL) 81 return; 82 83 regvma = 256 * 8 - sec->size - 8; 84 85 /* If we start on a local register, we have too many global registers. 86 We treat this error as nonfatal (meaning processing will continue in 87 search for other errors), because it's a link error in the same way 88 as an undefined symbol. */ 89 if (regvma < 32 * 8) 90 { 91 einfo ("%X%P: Too many global registers: %u, max 223\n", 92 (unsigned) sec->size / 8); 93 regvma = 32 * 8; 94 } 95 96 /* Set vma to correspond to first such register number * 8. */ 97 bfd_set_section_vma (link_info.output_bfd, sec, (bfd_vma) regvma); 98 99 /* Simplify symbol output for the register section (without contents; 100 created for register symbols) by setting the output offset to 0. 101 This section is only present when there are register symbols. */ 102 sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME); 103 if (sec != NULL) 104 bfd_set_section_vma (sec->owner, sec, 0); 105 106 if (!_bfd_mmix_after_linker_allocation (link_info.output_bfd, &link_info)) 107 { 108 /* This is a fatal error; make einfo call not return. */ 109 einfo ("%F%P: Can't finalize linker-allocated global registers\n"); 110 } 111 } 112 EOF 113 114 LDEMUL_AFTER_ALLOCATION=mmix_after_allocation 115 LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation 116
