1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright (C) 2005 - 2013 Tensilica Inc.
4 * Copyright (C) 2014 - 2016 Cadence Design Systems Inc.
5 */
6
7#ifndef _XTENSA_ASMMACRO_H
8#define _XTENSA_ASMMACRO_H
9
10#include <asm/arch/core.h>
11
12/*
13 * Function entry and return macros for supported ABIs.
14 */
15
16#if defined(__XTENSA_WINDOWED_ABI__)
17#define abi_entry	entry	sp, 16
18#define abi_ret		retw
19#elif defined(__XTENSA_CALL0_ABI__)
20#define abi_entry
21#define abi_ret		ret
22#else
23#error Unsupported Xtensa ABI
24#endif
25
26/*
27 * Some little helpers for loops. Use zero-overhead-loops
28 * where applicable and if supported by the processor.
29 *
30 * __loopi ar, at, size, inc
31 *         ar	register initialized with the start address
32 *	   at	scratch register used by macro
33 *	   size	size immediate value
34 *	   inc	increment
35 *
36 * __loops ar, as, at, inc_log2[, mask_log2][, cond][, ncond]
37 *	   ar	register initialized with the start address
38 *	   as	register initialized with the size
39 *	   at	scratch register use by macro
40 *	   inc_log2	increment [in log2]
41 *	   mask_log2	mask [in log2]
42 *	   cond		true condition (used in loop'cond')
43 *	   ncond	false condition (used in b'ncond')
44 *
45 * __loop  as
46 *	   restart loop. 'as' register must not have been modified!
47 *
48 * __endla ar, as, incr
49 *	   ar	start address (modified)
50 *	   as	scratch register used by __loops/__loopi macros or
51 *		end address used by __loopt macro
52 *	   inc	increment
53 */
54
55#if XCHAL_HAVE_LOOPS
56
57.macro	__loopi ar, at, size, incr
58	movi	\at, ((\size + \incr - 1) / (\incr))
59	loop	\at, 99f
60.endm
61
62
63.macro	__loops	ar, as, at, incr_log2, mask_log2, cond, ncond
64	.ifgt \incr_log2 - 1
65		addi	\at, \as, (1 << \incr_log2) - 1
66		.ifnc \mask_log2,
67			extui	\at, \at, \incr_log2, \mask_log2
68		.else
69			srli	\at, \at, \incr_log2
70		.endif
71	.endif
72	loop\cond	\at, 99f
73.endm
74
75
76.macro	__loopt	ar, as, at, incr_log2
77	sub	\at, \as, \ar
78	.ifgt	\incr_log2 - 1
79		addi	\at, \at, (1 << \incr_log2) - 1
80		srli	\at, \at, \incr_log2
81	.endif
82	loop	\at, 99f
83.endm
84
85
86.macro	__loop	as
87	loop	\as, 99f
88.endm
89
90
91.macro	__endl	ar, as
9299:
93.endm
94
95
96#else
97
98.macro	__loopi ar, at, size, incr
99	movi	\at, ((\size + \incr - 1) / (\incr))
100	addi	\at, \ar, \size
10198:
102.endm
103
104
105.macro	__loops	ar, as, at, incr_log2, mask_log2, cond, ncond
106	.ifnc \mask_log2,
107		extui	\at, \as, \incr_log2, \mask_log2
108	.else
109		.ifnc \ncond,
110			srli	\at, \as, \incr_log2
111		.endif
112	.endif
113	.ifnc \ncond,
114		b\ncond	\at, 99f
115
116	.endif
117	.ifnc \mask_log2,
118		slli	\at, \at, \incr_log2
119		add	\at, \ar, \at
120	.else
121		add	\at, \ar, \as
122	.endif
12398:
124.endm
125
126.macro	__loopt	ar, as, at, incr_log2
12798:
128.endm
129
130
131.macro	__loop	as
13298:
133.endm
134
135
136.macro	__endl	ar, as
137	bltu	\ar, \as, 98b
13899:
139.endm
140
141
142#endif
143
144
145.macro	__endla	ar, as, incr
146	addi	\ar, \ar, \incr
147	__endl	\ar \as
148.endm
149
150
151#endif /* _XTENSA_ASMMACRO_H */
152