1# Machine description for AArch64 architecture. 2# Copyright (C) 2009-2020 Free Software Foundation, Inc. 3# Contributed by ARM Ltd. 4# 5# This file is free software; you can redistribute it and/or modify it 6# under the terms of the GNU General Public License as published by the 7# Free Software Foundation; either version 3, or (at your option) any 8# later version. 9# 10# This file is distributed in the hope that it will be useful, but 11# WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13# General Public License for more details. 14# 15# Under Section 7 of GPL version 3, you are granted additional 16# permissions described in the GCC Runtime Library Exception, version 17# 3.1, as published by the Free Software Foundation. 18# 19# You should have received a copy of the GNU General Public License and 20# a copy of the GCC Runtime Library Exception along with this program; 21# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 22# <http://www.gnu.org/licenses/>. 23 24/* An executable stack is *not* required for these functions. */ 25#if defined(__ELF__) && defined(__linux__) 26.section .note.GNU-stack,"",%progbits 27.previous 28#endif 29 30# This file just makes sure that the .fini and .init sections do in 31# fact return. Users may put any desired instructions in those sections. 32# This file is the last thing linked into any executable. 33 34 # Note - this macro is complemented by the FUNC_START macro 35 # in crti.S. If you change this macro you must also change 36 # that macro match. 37 # 38 # Note - we do not try any fancy optimizations of the return 39 # sequences here, it is just not worth it. Instead keep things 40 # simple. Restore all the save resgisters, including the link 41 # register and then perform the correct function return instruction. 42.macro FUNC_END 43 ldp x19, x20, [sp], #16 44 ldp x21, x22, [sp], #16 45 ldp x23, x24, [sp], #16 46 ldp x25, x26, [sp], #16 47 ldp x27, x28, [sp], #16 48 ldp x29, x30, [sp], #16 49 ret 50.endm 51 52 53 .section ".init" 54 ;; 55 FUNC_END 56 57 .section ".fini" 58 ;; 59 FUNC_END 60 61# end of crtn.S 62