tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * __get_user functions.
3 *
4 * (C) Copyright 2001 Hirokazu Takata
5 *
6 * These functions have a non-standard call interface
7 * to make them more efficient, especially as they
8 * return an error value in addition to the "real"
9 * return value.
10 */
11
12#include <linux/config.h>
13
14/*
15 * __get_user_X
16 *
17 * Inputs: r0 contains the address
18 *
19 * Outputs: r0 is error code (0 or -EFAULT)
20 * r1 contains zero-extended value
21 *
22 * These functions should not modify any other registers,
23 * as they get called from within inline assembly.
24 */
25
26#ifdef CONFIG_ISA_DUAL_ISSUE
27
28 .text
29 .balign 4
30 .globl __get_user_1
31__get_user_1:
321: ldub r1, @r0 || ldi r0, #0
33 jmp r14
34
35 .balign 4
36 .globl __get_user_2
37__get_user_2:
382: lduh r1, @r0 || ldi r0, #0
39 jmp r14
40
41 .balign 4
42 .globl __get_user_4
43__get_user_4:
443: ld r1, @r0 || ldi r0, #0
45 jmp r14
46
47bad_get_user:
48 ldi r1, #0 || ldi r0, #-14
49 jmp r14
50
51#else /* not CONFIG_ISA_DUAL_ISSUE */
52
53 .text
54 .balign 4
55 .globl __get_user_1
56__get_user_1:
571: ldub r1, @r0
58 ldi r0, #0
59 jmp r14
60
61 .balign 4
62 .globl __get_user_2
63__get_user_2:
642: lduh r1, @r0
65 ldi r0, #0
66 jmp r14
67
68 .balign 4
69 .globl __get_user_4
70__get_user_4:
713: ld r1, @r0
72 ldi r0, #0
73 jmp r14
74
75bad_get_user:
76 ldi r1, #0
77 ldi r0, #-14
78 jmp r14
79
80#endif /* not CONFIG_ISA_DUAL_ISSUE */
81
82.section __ex_table,"a"
83 .long 1b,bad_get_user
84 .long 2b,bad_get_user
85 .long 3b,bad_get_user
86.previous
87
88 .end