1# This shell script emits a C file. -*- C -*- 2# Copyright (C) 2004-2022 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 21fragment <<EOF 22 23#include "ldmain.h" 24#include "ldctor.h" 25#include "elf/riscv.h" 26#include "elfxx-riscv.h" 27 28static void 29riscv_elf_before_allocation (void) 30{ 31 gld${EMULATION_NAME}_before_allocation (); 32 33 if (link_info.discard == discard_sec_merge) 34 link_info.discard = discard_l; 35 36 if (!bfd_link_relocatable (&link_info)) 37 { 38 /* We always need at least some relaxation to handle code alignment. */ 39 if (RELAXATION_DISABLED_BY_USER) 40 TARGET_ENABLE_RELAXATION; 41 else 42 ENABLE_RELAXATION; 43 } 44 45 link_info.relax_pass = 3; 46} 47 48static void 49gld${EMULATION_NAME}_after_allocation (void) 50{ 51 int need_layout = 0; 52 53 /* Don't attempt to discard unused .eh_frame sections until the final link, 54 as we can't reliably tell if they're used until after relaxation. */ 55 if (!bfd_link_relocatable (&link_info)) 56 { 57 need_layout = bfd_elf_discard_info (link_info.output_bfd, &link_info); 58 if (need_layout < 0) 59 { 60 einfo (_("%X%P: .eh_frame/.stab edit: %E\n")); 61 return; 62 } 63 } 64 65 /* PR 27566, if the phase of data segment is exp_seg_relro_adjust, 66 that means we are still adjusting the relro, and shouldn't do the 67 relaxations at this stage. Otherwise, we will get the symbol 68 values beofore handling the relro, and may cause truncated fails 69 when the relax range crossing the data segment. One of the solution 70 is to monitor the data segment phase while relaxing, to know whether 71 the relro has been handled or not. 72 73 I think we probably need to record more information about data 74 segment or alignments in the future, to make sure it is safe 75 to doing relaxations. */ 76 enum phase_enum *phase = &(expld.dataseg.phase); 77 bfd_elf${ELFSIZE}_riscv_set_data_segment_info (&link_info, (int *) phase); 78 79 ldelf_map_segments (need_layout); 80} 81 82/* This is a convenient point to tell BFD about target specific flags. 83 After the output has been created, but before inputs are read. */ 84 85static void 86riscv_create_output_section_statements (void) 87{ 88 /* See PR 22920 for an example of why this is necessary. */ 89 if (strstr (bfd_get_target (link_info.output_bfd), "riscv") == NULL) 90 { 91 /* The RISC-V backend needs special fields in the output hash structure. 92 These will only be created if the output format is a RISC-V format, 93 hence we do not support linking and changing output formats at the 94 same time. Use a link followed by objcopy to change output formats. */ 95 einfo (_("%F%P: error: cannot change output format" 96 " whilst linking %s binaries\n"), "RISC-V"); 97 return; 98 } 99} 100 101EOF 102 103LDEMUL_BEFORE_ALLOCATION=riscv_elf_before_allocation 104LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation 105LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=riscv_create_output_section_statements 106