aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-arm/assembler.h
blob: add451ab89473948804619434181e9b216cdef6c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
/*
 *  linux/include/asm-arm/assembler.h
 *
 *  Copyright (C) 1996-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  This file contains arm architecture specific defines
 *  for the different processors.
 *
 *  Do not include any C declarations in this file - it is included by
 *  assembler source.
 */
#ifndef __ASSEMBLY__
#error "Only include this from assembly code"
#endif

#include <asm/ptrace.h>

/*
 * Endian independent macros for shifting bytes within registers.
 */
#ifndef __ARMEB__
#define pull            lsr
#define push            lsl
#define get_byte_0      lsl #0
#define get_byte_1	lsr #8
#define get_byte_2	lsr #16
#define get_byte_3	lsr #24
#define put_byte_0      lsl #0
#define put_byte_1	lsl #8
#define put_byte_2	lsl #16
#define put_byte_3	lsl #24
#else
#define pull            lsl
#define push            lsr
#define get_byte_0	lsr #24
#define get_byte_1	lsr #16
#define get_byte_2	lsr #8
#define get_byte_3      lsl #0
#define put_byte_0	lsl #24
#define put_byte_1	lsl #16
#define put_byte_2	lsl #8
#define put_byte_3      lsl #0
#endif

/*
 * Data preload for architectures that support it
 */
#if __LINUX_ARM_ARCH__ >= 5
#define PLD(code...)	code
#else
#define PLD(code...)
#endif

#define MODE_USR	USR_MODE
#define MODE_FIQ	FIQ_MODE
#define MODE_IRQ	IRQ_MODE
#define MODE_SVC	SVC_MODE

#define DEFAULT_FIQ	MODE_FIQ

/*
 * Enable and disable interrupts
 */
#if __LINUX_ARM_ARCH__ >= 6
	.macro	disable_irq
	cpsid	i
	.endm

	.macro	enable_irq
	cpsie	i
	.endm
#else
	.macro	disable_irq
	msr	cpsr_c, #PSR_I_BIT | SVC_MODE
	.endm

	.macro	enable_irq
	msr	cpsr_c, #SVC_MODE
	.endm
#endif

/*
 * Save the current IRQ state and disable IRQs.  Note that this macro
 * assumes FIQs are enabled, and that the processor is in SVC mode.
 */
	.macro	save_and_disable_irqs, oldcpsr
	mrs	\oldcpsr, cpsr
	disable_irq
	.endm

/*
 * Restore interrupt state previously stored in a register.  We don't
 * guarantee that this will preserve the flags.
 */
	.macro	restore_irqs, oldcpsr
	msr	cpsr_c, \oldcpsr
	.endm

/*
 * These two are used to save LR/restore PC over a user-based access.
 * The old 26-bit architecture requires that we do.  On 32-bit
 * architecture, we can safely ignore this requirement.
 */
	.macro	save_lr
	.endm

	.macro	restore_pc
	mov	pc, lr
	.endm

#define USER(x...)				\
9999:	x;					\
	.section __ex_table,"a";		\
	.align	3;				\
	.long	9999b,9001f;			\
	.previous