2 * linux/arch/arm/lib/putuser.S
4 * Copyright (C) 2001 Russell King
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.
10 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
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.
18 * Inputs: r0 contains the address
19 * r1, r2 contains the value
20 * Outputs: r0 is the error code
23 * No other registers must be altered. (see include/asm-arm/uaccess.h
24 * for specific ASM register usage).
26 * Note that ADDR_LIMIT is either 0 or 0xc0000000
27 * Note also that it is intended that __put_user_bad is not global.
29 #include <asm/constants.h>
35 ldr r2, [r2, #TSK_ADDR_LIMIT]
47 ldr r2, [r2, #TSK_ADDR_LIMIT]
50 2: strlsbt r1, [r0], #1
61 ldr r2, [r2, #TSK_ADDR_LIMIT]
73 ldr ip, [ip, #TSK_ADDR_LIMIT]
76 5: strlst r1, [r0], #4
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