tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/arch/arm26/lib/putuser.S
3 *
4 * Copyright (C) 2001 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 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
11 *
12 * These functions have a non-standard call interface to make
13 * them more efficient, especially as they return an error
14 * value in addition to the "real" return value.
15 *
16 * __put_user_X
17 *
18 * Inputs: r0 contains the address
19 * r1, r2 contains the value
20 * Outputs: r0 is the error code
21 * lr corrupted
22 *
23 * No other registers must be altered. (see include/asm-arm/uaccess.h
24 * for specific ASM register usage).
25 *
26 * Note that ADDR_LIMIT is either 0 or 0xc0000000
27 * Note also that it is intended that __put_user_bad is not global.
28 */
29#include <asm/asm_offsets.h>
30#include <asm/thread_info.h>
31#include <asm/errno.h>
32
33 .global __put_user_1
34__put_user_1:
35 bic r2, sp, #0x1f00
36 bic r2, r2, #0x00ff
37 str lr, [sp, #-4]!
38 ldr r2, [r2, #TI_ADDR_LIMIT]
39 sub r2, r2, #1
40 cmp r0, r2
41 bge __put_user_bad
421: cmp r0, #0x02000000
43 strlsbt r1, [r0]
44 strgeb r1, [r0]
45 mov r0, #0
46 ldmfd sp!, {pc}^
47
48 .global __put_user_2
49__put_user_2:
50 bic r2, sp, #0x1f00
51 bic r2, r2, #0x00ff
52 str lr, [sp, #-4]!
53 ldr r2, [r2, #TI_ADDR_LIMIT]
54 sub r2, r2, #2
55 cmp r0, r2
56 bge __put_user_bad
572: cmp r0, #0x02000000
58 strlsbt r1, [r0], #1
59 strgeb r1, [r0], #1
60 mov r1, r1, lsr #8
613: strlsbt r1, [r0]
62 strgeb r1, [r0]
63 mov r0, #0
64 ldmfd sp!, {pc}^
65
66 .global __put_user_4
67__put_user_4:
68 bic r2, sp, #0x1f00
69 bic r2, r2, #0x00ff
70 str lr, [sp, #-4]!
71 ldr r2, [r2, #TI_ADDR_LIMIT]
72 sub r2, r2, #4
73 cmp r0, r2
744: bge __put_user_bad
75 cmp r0, #0x02000000
76 strlst r1, [r0]
77 strge r1, [r0]
78 mov r0, #0
79 ldmfd sp!, {pc}^
80
81 .global __put_user_8
82__put_user_8:
83 bic ip, sp, #0x1f00
84 bic ip, ip, #0x00ff
85 str lr, [sp, #-4]!
86 ldr ip, [ip, #TI_ADDR_LIMIT]
87 sub ip, ip, #8
88 cmp r0, ip
89 bge __put_user_bad
90 cmp r0, #0x02000000
915: strlst r1, [r0], #4
926: strlst r2, [r0]
93 strge r1, [r0], #4
94 strge r2, [r0]
95 mov r0, #0
96 ldmfd sp!, {pc}^
97
98__put_user_bad:
99 mov r0, #-EFAULT
100 mov pc, lr
101
102.section __ex_table, "a"
103 .long 1b, __put_user_bad
104 .long 2b, __put_user_bad
105 .long 3b, __put_user_bad
106 .long 4b, __put_user_bad
107 .long 5b, __put_user_bad
108 .long 6b, __put_user_bad
109.previous