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/*
 *  linux/arch/arm/lib/getuser.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.
 *
 * __get_user_X
 *
 * Inputs:      r0 contains the address
 * Outputs:     r0 is the error code
 *              r1, r2 contains the zero-extended value
 *              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 __get_user_bad is not global.
 */
#include 
 
        .global __get_user_1
__get_user_1:
        bic     r1, sp, #0x1f00
        bic     r1, r1, #0x00ff
        ldr     r1, [r1, #TSK_ADDR_LIMIT]
        sub     r1, r1, #1
        cmp     r0, r1
1:      ldrlsbt r1, [r0]
        movls   r0, #0
        movls   pc, lr
        b       __get_user_bad
 
        .global __get_user_2
__get_user_2:
        bic     r2, sp, #0x1f00
        bic     r2, r2, #0x00ff
        ldr     r2, [r2, #TSK_ADDR_LIMIT]
        sub     r2, r2, #2
        cmp     r0, r2
2:      ldrlsbt r1, [r0], #1
3:      ldrlsbt r2, [r0]
        orrls   r1, r1, r2, lsl #8
        movls   r0, #0
        movls   pc, lr
        b       __get_user_bad
 
        .global __get_user_4
__get_user_4:
        bic     r1, sp, #0x1f00
        bic     r1, r1, #0x00ff
        ldr     r1, [r1, #TSK_ADDR_LIMIT]
        sub     r1, r1, #4
        cmp     r0, r1
4:      ldrlst  r1, [r0]
        movls   r0, #0
        movls   pc, lr
        b       __get_user_bad
 
        .global __get_user_8
__get_user_8:
        bic     r2, sp, #0x1f00
        bic     r2, r2, #0x00ff
        ldr     r2, [r2, #TSK_ADDR_LIMIT]
        sub     r2, r2, #8
        cmp     r0, r2
5:      ldrlst  r1, [r0], #4
6:      ldrlst  r2, [r0]
        movls   r0, #0
        movls   pc, lr
 
        /* fall through */
 
__get_user_bad_8:
        mov     r2, #0
__get_user_bad:
        mov     r1, #0
        mov     r0, #-14
        mov     pc, lr
 
.section __ex_table, "a"
        .long   1b, __get_user_bad
        .long   2b, __get_user_bad
        .long   3b, __get_user_bad
        .long   4b, __get_user_bad
        .long   5b, __get_user_bad_8
        .long   6b, __get_user_bad_8
.previous

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/arch/arm/lib/getuser.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 them more`
13			`* efficient, especially as they return an error value in addition to`
14			`* the "real" return value.`
15			`*`
16			`* __get_user_X`
17			`*`
18			`* Inputs: r0 contains the address`
19			`* Outputs: r0 is the error code`
20			`* r1, r2 contains the zero-extended value`
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 __get_user_bad is not global.`
28			`*/`
29			`#include`
30
31			`.global __get_user_1`
32			`__get_user_1:`
33			`bic r1, sp, #0x1f00`
34			`bic r1, r1, #0x00ff`
35			`ldr r1, [r1, #TSK_ADDR_LIMIT]`
36			`sub r1, r1, #1`
37			`cmp r0, r1`
38			`1: ldrlsbt r1, [r0]`
39			`movls r0, #0`
40			`movls pc, lr`
41			`b __get_user_bad`
42
43			`.global __get_user_2`
44			`__get_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: ldrlsbt r1, [r0], #1`
51			`3: ldrlsbt r2, [r0]`
52			`orrls r1, r1, r2, lsl #8`
53			`movls r0, #0`
54			`movls pc, lr`
55			`b __get_user_bad`
56
57			`.global __get_user_4`
58			`__get_user_4:`
59			`bic r1, sp, #0x1f00`
60			`bic r1, r1, #0x00ff`
61			`ldr r1, [r1, #TSK_ADDR_LIMIT]`
62			`sub r1, r1, #4`
63			`cmp r0, r1`
64			`4: ldrlst r1, [r0]`
65			`movls r0, #0`
66			`movls pc, lr`
67			`b __get_user_bad`
68
69			`.global __get_user_8`
70			`__get_user_8:`
71			`bic r2, sp, #0x1f00`
72			`bic r2, r2, #0x00ff`
73			`ldr r2, [r2, #TSK_ADDR_LIMIT]`
74			`sub r2, r2, #8`
75			`cmp r0, r2`
76			`5: ldrlst r1, [r0], #4`
77			`6: ldrlst r2, [r0]`
78			`movls r0, #0`
79			`movls pc, lr`
80
81			`/* fall through */`
82
83			`__get_user_bad_8:`
84			`mov r2, #0`
85			`__get_user_bad:`
86			`mov r1, #0`
87			`mov r0, #-14`
88			`mov pc, lr`
89
90			`.section __ex_table, "a"`
91			`.long 1b, __get_user_bad`
92			`.long 2b, __get_user_bad`
93			`.long 3b, __get_user_bad`
94			`.long 4b, __get_user_bad`
95			`.long 5b, __get_user_bad_8`
96			`.long 6b, __get_user_bad_8`
97			`.previous`

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