1# This shell script emits a C file. -*- C -*- 2# Copyright 2001, 2002, 2003, 2004, 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 elf32.em and mmo.em, used to define 24# MMIX-specific things common to ELF and MMO. 25 26fragment <<EOF 27#include "elf/mmix.h" 28 29/* Set up handling of linker-allocated global registers. */ 30 31static void 32mmix_before_allocation (void) 33{ 34 /* Call the default first. */ 35 gld${EMULATION_NAME}_before_allocation (); 36 37 /* There's a needrelax.em which uses this ..._before_allocation-hook and 38 just has the statement below as payload. It's more of a hassle to 39 use that than to just include these two lines and take the 40 maintenance burden to keep them in sync. (Of course we lose the 41 maintenance burden of checking that it still does what we need.) */ 42 43 /* Force -relax on (regardless of whether we're doing a relocatable 44 link). */ 45 command_line.relax = TRUE; 46 47 if (!_bfd_mmix_before_linker_allocation (link_info.output_bfd, &link_info)) 48 einfo ("%X%P: Internal problems setting up section %s", 49 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 50} 51 52/* We need to set the VMA of the .MMIX.reg_contents section when it has 53 been allocated, and produce the final settings for the linker-generated 54 GREGs. */ 55 56static void 57mmix_after_allocation (void) 58{ 59 asection *sec 60 = bfd_get_section_by_name (link_info.output_bfd, 61 MMIX_REG_CONTENTS_SECTION_NAME); 62 bfd_signed_vma regvma; 63 64 /* If there's no register section, we don't need to do anything. On the 65 other hand, if there's a non-standard linker-script without a mapping 66 from MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME when that section is 67 present (as in the ld test "NOCROSSREFS 2"), that section (1) will be 68 orphaned; not inserted in MMIX_REG_CONTENTS_SECTION_NAME and (2) we 69 will not do the necessary preparations for those relocations that 70 caused it to be created. We'll SEGV from the latter error. The 71 former error in separation will result in a non-working binary, but 72 that's expected when you play tricks with linker scripts. The 73 "NOCROSSREFS 2" test does not run the output so it does not matter 74 there. */ 75 if (sec == NULL) 76 sec 77 = bfd_get_section_by_name (link_info.output_bfd, 78 MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME); 79 if (sec == NULL) 80 return; 81 82 regvma = 256 * 8 - sec->size - 8; 83 84 /* If we start on a local register, we have too many global registers. 85 We treat this error as nonfatal (meaning processing will continue in 86 search for other errors), because it's a link error in the same way 87 as an undefined symbol. */ 88 if (regvma < 32 * 8) 89 { 90 einfo ("%X%P: Too many global registers: %u, max 223\n", 91 (unsigned) sec->size / 8); 92 regvma = 32 * 8; 93 } 94 95 /* Set vma to correspond to first such register number * 8. */ 96 bfd_set_section_vma (link_info.output_bfd, sec, (bfd_vma) regvma); 97 98 /* Simplify symbol output for the register section (without contents; 99 created for register symbols) by setting the output offset to 0. 100 This section is only present when there are register symbols. */ 101 sec = bfd_get_section_by_name (link_info.output_bfd, MMIX_REG_SECTION_NAME); 102 if (sec != NULL) 103 bfd_set_section_vma (abfd, sec, 0); 104 105 if (!_bfd_mmix_after_linker_allocation (link_info.output_bfd, &link_info)) 106 { 107 /* This is a fatal error; make einfo call not return. */ 108 einfo ("%F%P: Can't finalize linker-allocated global registers\n"); 109 } 110} 111EOF 112 113LDEMUL_AFTER_ALLOCATION=mmix_after_allocation 114LDEMUL_BEFORE_ALLOCATION=mmix_before_allocation 115