Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * linux/asm/assembler.h
3 *
4 * This file contains arm architecture specific defines
5 * for the different processors.
6 *
7 * Do not include any C declarations in this file - it is included by
8 * assembler source.
9 */
10#ifndef __ASSEMBLY__
11#error "Only include this from assembly code"
12#endif
13
14/*
15 * Endian independent macros for shifting bytes within registers.
16 */
17#define pull lsr
18#define push lsl
19#define byte(x) (x*8)
20
21#ifdef __STDC__
22#define LOADREGS(cond, base, reglist...)\
23 ldm##cond base,reglist^
24
25#define RETINSTR(instr, regs...)\
26 instr##s regs
27#else
28#define LOADREGS(cond, base, reglist...)\
29 ldm/**/cond base,reglist^
30
31#define RETINSTR(instr, regs...)\
32 instr/**/s regs
33#endif
34
35#define MODENOP\
36 mov r0, r0
37
38#define MODE(savereg,tmpreg,mode) \
39 mov savereg, pc; \
40 bic tmpreg, savereg, $0x0c000003; \
41 orr tmpreg, tmpreg, $mode; \
42 teqp tmpreg, $0
43
44#define RESTOREMODE(savereg) \
45 teqp savereg, $0
46
47#define SAVEIRQS(tmpreg)
48
49#define RESTOREIRQS(tmpreg)
50
51#define DISABLEIRQS(tmpreg)\
52 teqp pc, $0x08000003
53
54#define ENABLEIRQS(tmpreg)\
55 teqp pc, $0x00000003
56
57#define USERMODE(tmpreg)\
58 teqp pc, $0x00000000;\
59 mov r0, r0
60
61#define SVCMODE(tmpreg)\
62 teqp pc, $0x00000003;\
63 mov r0, r0
64
65
66/*
67 * Save the current IRQ state and disable IRQs
68 * Note that this macro assumes FIQs are enabled, and
69 * that the processor is in SVC mode.
70 */
71 .macro save_and_disable_irqs, oldcpsr, temp
72 mov \oldcpsr, pc
73 orr \temp, \oldcpsr, #0x08000000
74 teqp \temp, #0
75 .endm
76
77/*
78 * Restore interrupt state previously stored in
79 * a register
80 * ** Actually do nothing on Arc - hope that the caller uses a MOVS PC soon
81 * after!
82 */
83 .macro restore_irqs, oldcpsr
84 @ This be restore_irqs
85 .endm
86
87/*
88 * These two are used to save LR/restore PC over a user-based access.
89 * The old 26-bit architecture requires that we save lr (R14)
90 */
91 .macro save_lr
92 str lr, [sp, #-4]!
93 .endm
94
95 .macro restore_pc
96 ldmfd sp!, {pc}^
97 .endm
98
99#define USER(x...) \
1009999: x; \
101 .section __ex_table,"a"; \
102 .align 3; \
103 .long 9999b,9001f; \
104 .previous
105
106