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/*
 *  linux/arch/arm/lib/putuser.S
 *
 *  Copyright (C) 2001 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.
 *
 *  Idea from x86 version, (C) Copyright 1998 Linus Torvalds
 *
 * These functions have a non-standard call interface to make
 * them more efficient, especially as they return an error
 * value in addition to the "real" return value.
 *
 * __put_user_X
 *
 * Inputs:      r0 contains the address
 *              r1, r2 contains the value
 * Outputs:     r0 is the error code
 *              lr corrupted
 *
 * No other registers must be altered.  (see include/asm-arm/uaccess.h
 * for specific ASM register usage).
 *
 * Note that ADDR_LIMIT is either 0 or 0xc0000000
 * Note also that it is intended that __put_user_bad is not global.
 */
#include 
 
        .global __put_user_1
__put_user_1:
        bic     r2, sp, #0x1f00
        bic     r2, r2, #0x00ff
        ldr     r2, [r2, #TSK_ADDR_LIMIT]
        sub     r2, r2, #1
        cmp     r0, r2
1:      strlsbt r1, [r0]
        movls   r0, #0
        movls   pc, lr
        b       __put_user_bad
 
        .global __put_user_2
__put_user_2:
        bic     r2, sp, #0x1f00
        bic     r2, r2, #0x00ff
        ldr     r2, [r2, #TSK_ADDR_LIMIT]
        sub     r2, r2, #2
        cmp     r0, r2
2:      strlsbt r1, [r0], #1
        movls   r1, r1, lsr #8
3:      strlsbt r1, [r0]
        movls   r0, #0
        movls   pc, lr
        b       __put_user_bad
 
        .global __put_user_4
__put_user_4:
        bic     r2, sp, #0x1f00
        bic     r2, r2, #0x00ff
        ldr     r2, [r2, #TSK_ADDR_LIMIT]
        sub     r2, r2, #4
        cmp     r0, r2
4:      strlst  r1, [r0]
        movls   r0, #0
        movls   pc, lr
        b       __put_user_bad
 
        .global __put_user_8
__put_user_8:
        bic     ip, sp, #0x1f00
        bic     ip, ip, #0x00ff
        ldr     ip, [ip, #TSK_ADDR_LIMIT]
        sub     ip, ip, #8
        cmp     r0, ip
5:      strlst  r1, [r0], #4
6:      strlst  r2, [r0]
        movls   r0, #0
        movls   pc, lr
 
        /* fall through */
 
__put_user_bad:
        mov     r0, #-14
        mov     pc, lr
 
.section __ex_table, "a"
        .long   1b, __put_user_bad
        .long   2b, __put_user_bad
        .long   3b, __put_user_bad
        .long   4b, __put_user_bad
        .long   5b, __put_user_bad
        .long   6b, __put_user_bad
.previous

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/arch/arm/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`
30
31			`.global __put_user_1`
32			`__put_user_1:`
33			`bic r2, sp, #0x1f00`
34			`bic r2, r2, #0x00ff`
35			`ldr r2, [r2, #TSK_ADDR_LIMIT]`
36			`sub r2, r2, #1`
37			`cmp r0, r2`
38			`1: strlsbt r1, [r0]`
39			`movls r0, #0`
40			`movls pc, lr`
41			`b __put_user_bad`
42
43			`.global __put_user_2`
44			`__put_user_2:`
45			`bic r2, sp, #0x1f00`
46			`bic r2, r2, #0x00ff`
47			`ldr r2, [r2, #TSK_ADDR_LIMIT]`
48			`sub r2, r2, #2`
49			`cmp r0, r2`
50			`2: strlsbt r1, [r0], #1`
51			`movls r1, r1, lsr #8`
52			`3: strlsbt r1, [r0]`
53			`movls r0, #0`
54			`movls pc, lr`
55			`b __put_user_bad`
56
57			`.global __put_user_4`
58			`__put_user_4:`
59			`bic r2, sp, #0x1f00`
60			`bic r2, r2, #0x00ff`
61			`ldr r2, [r2, #TSK_ADDR_LIMIT]`
62			`sub r2, r2, #4`
63			`cmp r0, r2`
64			`4: strlst r1, [r0]`
65			`movls r0, #0`
66			`movls pc, lr`
67			`b __put_user_bad`
68
69			`.global __put_user_8`
70			`__put_user_8:`
71			`bic ip, sp, #0x1f00`
72			`bic ip, ip, #0x00ff`
73			`ldr ip, [ip, #TSK_ADDR_LIMIT]`
74			`sub ip, ip, #8`
75			`cmp r0, ip`
76			`5: strlst r1, [r0], #4`
77			`6: strlst r2, [r0]`
78			`movls r0, #0`
79			`movls pc, lr`
80
81			`/* fall through */`
82
83			`__put_user_bad:`
84			`mov r0, #-14`
85			`mov pc, lr`
86
87			`.section __ex_table, "a"`
88			`.long 1b, __put_user_bad`
89			`.long 2b, __put_user_bad`
90			`.long 3b, __put_user_bad`
91			`.long 4b, __put_user_bad`
92			`.long 5b, __put_user_bad`
93			`.long 6b, __put_user_bad`
94			`.previous`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [arm/] [lib/] [putuser.S] - Blame information for rev 1765