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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/lib/putuser.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1/*
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 * r2, r3 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/constants.h>
30#include <asm/thread_info.h>
31#include <asm/errno.h>
32
33 .global __put_user_1
34__put_user_1:
351: strbt r2, [r0]
36 mov r0, #0
37 mov pc, lr
38
39 .global __put_user_2
40__put_user_2:
41 mov ip, r2, lsr #8
42#ifndef __ARMEB__
432: strbt r2, [r0], #1
443: strbt ip, [r0]
45#else
462: strbt ip, [r0], #1
473: strbt r2, [r0]
48#endif
49 mov r0, #0
50 mov pc, lr
51
52 .global __put_user_4
53__put_user_4:
544: strt r2, [r0]
55 mov r0, #0
56 mov pc, lr
57
58 .global __put_user_8
59__put_user_8:
605: strt r2, [r0], #4
616: strt r3, [r0]
62 mov r0, #0
63 mov pc, lr
64
65__put_user_bad:
66 mov r0, #-EFAULT
67 mov pc, lr
68
69.section __ex_table, "a"
70 .long 1b, __put_user_bad
71 .long 2b, __put_user_bad
72 .long 3b, __put_user_bad
73 .long 4b, __put_user_bad
74 .long 5b, __put_user_bad
75 .long 6b, __put_user_bad
76.previous