File: [Development] / linux-2.6-xfs / arch / arm / lib / getuser.S (download)
Revision 1.3, Fri Oct 1 15:10:15 2004 UTC (13 years, 1 month ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
Changes since 1.2: +16 -41
lines
Upgrade kernel to 2.6.9-rc3 and kdb to 4.4
Merge of 2.6.x-xfs-melb:linux:19628a by kenmcd.
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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 <asm/constants.h>
#include <asm/thread_info.h>
#include <asm/errno.h>
.global __get_user_1
__get_user_1:
1: ldrbt r1, [r0]
mov r0, #0
mov pc, lr
.global __get_user_2
__get_user_2:
2: ldrbt r1, [r0], #1
3: ldrbt r2, [r0]
#ifndef __ARMEB__
orr r1, r1, r2, lsl #8
#else
orr r1, r2, r1, lsl #8
#endif
mov r0, #0
mov pc, lr
.global __get_user_4
__get_user_4:
4: ldrt r1, [r0]
mov r0, #0
mov pc, lr
.global __get_user_8
__get_user_8:
5: ldrt r1, [r0], #4
6: ldrt r2, [r0]
mov r0, #0
mov pc, lr
__get_user_bad_8:
mov r2, #0
__get_user_bad:
mov r1, #0
mov r0, #-EFAULT
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