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1/*
2 * linux/include/asm-arm/assembler.h
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This file contains arm architecture specific defines
11 * for the different processors.
12 *
13 * Do not include any C declarations in this file - it is included by
14 * assembler source.
15 */
16#ifndef __ASSEMBLY__
17#error "Only include this from assembly code"
18#endif
19
20#include <asm/ptrace.h>
21
22/*
23 * Endian independent macros for shifting bytes within registers.
24 */
25#ifndef __ARMEB__
26#define pull lsr
27#define push lsl
28#define get_byte_0 lsl #0
29#define get_byte_1 lsr #8
30#define get_byte_2 lsr #16
31#define get_byte_3 lsr #24
32#define put_byte_0 lsl #0
33#define put_byte_1 lsl #8
34#define put_byte_2 lsl #16
35#define put_byte_3 lsl #24
36#else
37#define pull lsl
38#define push lsr
39#define get_byte_0 lsr #24
40#define get_byte_1 lsr #16
41#define get_byte_2 lsr #8
42#define get_byte_3 lsl #0
43#define put_byte_0 lsl #24
44#define put_byte_1 lsl #16
45#define put_byte_2 lsl #8
46#define put_byte_3 lsl #0
47#endif
48
49/*
50 * Data preload for architectures that support it
51 */
52#if __LINUX_ARM_ARCH__ >= 5
53#define PLD(code...) code
54#else
55#define PLD(code...)
56#endif
57
58/*
59 * Enable and disable interrupts
60 */
61#if __LINUX_ARM_ARCH__ >= 6
62 .macro disable_irq
63 cpsid i
64 .endm
65
66 .macro enable_irq
67 cpsie i
68 .endm
69#else
70 .macro disable_irq
71 msr cpsr_c, #PSR_I_BIT | SVC_MODE
72 .endm
73
74 .macro enable_irq
75 msr cpsr_c, #SVC_MODE
76 .endm
77#endif
78
79/*
80 * Save the current IRQ state and disable IRQs. Note that this macro
81 * assumes FIQs are enabled, and that the processor is in SVC mode.
82 */
83 .macro save_and_disable_irqs, oldcpsr
84 mrs \oldcpsr, cpsr
85 disable_irq
86 .endm
87
88/*
89 * Restore interrupt state previously stored in a register. We don't
90 * guarantee that this will preserve the flags.
91 */
92 .macro restore_irqs, oldcpsr
93 msr cpsr_c, \oldcpsr
94 .endm
95
96#define USER(x...) \
979999: x; \
98 .section __ex_table,"a"; \
99 .align 3; \
100 .long 9999b,9001f; \
101 .previous