1#   Copyright (C) 2001-2020 Free Software Foundation, Inc.
2#   Written By Nick Clifton
3#
4# This file is free software; you can redistribute it and/or modify it
5# under the terms of the GNU General Public License as published by the
6# Free Software Foundation; either version 3, or (at your option) any
7# later version.
8#
9# This file is distributed in the hope that it will be useful, but
10# WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12# General Public License for more details.
13#
14# Under Section 7 of GPL version 3, you are granted additional
15# permissions described in the GCC Runtime Library Exception, version
16# 3.1, as published by the Free Software Foundation.
17#
18# You should have received a copy of the GNU General Public License and
19# a copy of the GCC Runtime Library Exception along with this program;
20# see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
21# <http://www.gnu.org/licenses/>.
22
23/* An executable stack is *not* required for these functions.  */
24#if defined(__ELF__) && defined(__linux__)
25.section .note.GNU-stack,"",%progbits
26.previous
27#endif
28
29#ifdef __ARM_EABI__
30/* Some attributes that are common to all routines in this file.  */
31	/* Tag_ABI_align_needed: This code does not require 8-byte
32	   alignment from the caller.  */
33	/* .eabi_attribute 24, 0  -- default setting.  */
34	/* Tag_ABI_align_preserved: This code preserves 8-byte
35	   alignment in any callee.  */
36	.eabi_attribute 25, 1
37#endif /* __ARM_EABI__ */
38
39# This file just makes sure that the .fini and .init sections do in
40# fact return.  Users may put any desired instructions in those sections.
41# This file is the last thing linked into any executable.
42
43	# Note - this macro is complemented by the FUNC_START macro
44	# in crti.S.  If you change this macro you must also change
45	# that macro match.
46	#
47	# Note - we do not try any fancy optimizations of the return
48	# sequences here, it is just not worth it.  Instead keep things
49	# simple.  Restore all the save registers, including the link
50	# register and then perform the correct function return instruction.
51	# We also save/restore r3 to ensure stack alignment.
52.macro FUNC_END
53#ifdef __thumb__
54	.thumb
55
56	pop	{r3, r4, r5, r6, r7}
57	pop	{r3}
58	mov	lr, r3
59#else
60	.arm
61
62	sub	sp, fp, #40
63	ldmfd	sp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, lr}
64#endif
65
66#if defined __THUMB_INTERWORK__ || defined __thumb__
67	bx	lr
68#else
69	mov	pc, lr
70#endif
71.endm
72
73
74	.section	".init"
75	;;
76	FUNC_END
77
78	.section	".fini"
79	;;
80	FUNC_END
81
82# end of crtn.S
83