1/*
2   Copyright (c) 2011, 2012 ARM Ltd
3   All rights reserved.
4
5   Redistribution and use in source and binary forms, with or without
6   modification, are permitted provided that the following conditions
7   are met:
8   1. Redistributions of source code must retain the above copyright
9      notice, this list of conditions and the following disclaimer.
10   2. Redistributions in binary form must reproduce the above copyright
11      notice, this list of conditions and the following disclaimer in the
12      documentation and/or other materials provided with the distribution.
13   3. The name of the company may not be used to endorse or promote
14      products derived from this software without specific prior written
15      permission.
16
17   THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
18   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19   MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20   IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
22   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <picolibc.h>
30
31#define GPR_LAYOUT			\
32	REG_PAIR (x19, x20,  0);	\
33	REG_PAIR (x21, x22, 16);	\
34	REG_PAIR (x23, x24, 32);	\
35	REG_PAIR (x25, x26, 48);	\
36	REG_PAIR (x27, x28, 64);	\
37	REG_PAIR (x29, x30, 80);	\
38	REG_ONE (x16,      96)
39
40#define FPR_LAYOUT			\
41	REG_PAIR ( d8,  d9, 112);	\
42	REG_PAIR (d10, d11, 128);	\
43	REG_PAIR (d12, d13, 144);	\
44	REG_PAIR (d14, d15, 160);
45
46// int setjmp (jmp_buf)
47	.global	setjmp
48	.type	setjmp, %function
49setjmp:
50#ifndef __LP64__
51	mov	w0, w0
52#endif
53	mov	x16, sp
54#define REG_PAIR(REG1, REG2, OFFS)	stp REG1, REG2, [x0, OFFS]
55#define REG_ONE(REG1, OFFS)		str REG1, [x0, OFFS]
56	GPR_LAYOUT
57#if __ARM_FP
58	FPR_LAYOUT
59#endif
60#undef REG_PAIR
61#undef REG_ONE
62	mov	w0, #0
63	ret
64	.size	setjmp, .-setjmp
65
66// void longjmp (jmp_buf, int) __attribute__ ((noreturn))
67	.global	longjmp
68	.type	longjmp, %function
69longjmp:
70#ifndef __LP64__
71	mov	w0, w0
72#endif
73
74#define REG_PAIR(REG1, REG2, OFFS)	ldp REG1, REG2, [x0, OFFS]
75#define REG_ONE(REG1, OFFS)		ldr REG1, [x0, OFFS]
76	GPR_LAYOUT
77#if __ARM_FP
78	FPR_LAYOUT
79#endif
80#undef REG_PAIR
81#undef REG_ONE
82	mov	sp, x16
83	cmp	w1, #0
84	cinc	w0, w1, eq
85	// use br not ret, as ret is guaranteed to mispredict
86	br	x30
87	.size	longjmp, .-longjmp
88