1# Machine description for AArch64 architecture.
2# Copyright (C) 2009-2015 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