77 lines
1.6 KiB
ArmAsm
77 lines
1.6 KiB
ArmAsm
/*
|
|
* 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
|
|
* r2, r3 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 <asm/constants.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/errno.h>
|
|
|
|
.global __put_user_1
|
|
__put_user_1:
|
|
1: strbt r2, [r0]
|
|
mov r0, #0
|
|
mov pc, lr
|
|
|
|
.global __put_user_2
|
|
__put_user_2:
|
|
mov ip, r2, lsr #8
|
|
#ifndef __ARMEB__
|
|
2: strbt r2, [r0], #1
|
|
3: strbt ip, [r0]
|
|
#else
|
|
2: strbt ip, [r0], #1
|
|
3: strbt r2, [r0]
|
|
#endif
|
|
mov r0, #0
|
|
mov pc, lr
|
|
|
|
.global __put_user_4
|
|
__put_user_4:
|
|
4: strt r2, [r0]
|
|
mov r0, #0
|
|
mov pc, lr
|
|
|
|
.global __put_user_8
|
|
__put_user_8:
|
|
5: strt r2, [r0], #4
|
|
6: strt r3, [r0]
|
|
mov r0, #0
|
|
mov pc, lr
|
|
|
|
__put_user_bad:
|
|
mov r0, #-EFAULT
|
|
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
|