74 lines
1.5 KiB
ArmAsm
74 lines
1.5 KiB
ArmAsm
/*
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* linux/arch/arm/lib/putuser.S
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*
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* Copyright (C) 2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Idea from x86 version, (C) Copyright 1998 Linus Torvalds
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*
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* These functions have a non-standard call interface to make
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* them more efficient, especially as they return an error
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* value in addition to the "real" return value.
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*
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* __put_user_X
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*
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* Inputs: r0 contains the address
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* r2, r3 contains the value
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* Outputs: r0 is the error code
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* lr corrupted
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*
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* No other registers must be altered. (see include/asm-arm/uaccess.h
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* for specific ASM register usage).
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*
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* Note that ADDR_LIMIT is either 0 or 0xc0000000
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* Note also that it is intended that __put_user_bad is not global.
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*/
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#include <asm/errno.h>
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.global __put_user_1
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__put_user_1:
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1: strbt r2, [r0]
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mov r0, #0
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mov pc, lr
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.global __put_user_2
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__put_user_2:
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mov ip, r2, lsr #8
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#ifndef __ARMEB__
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2: strbt r2, [r0], #1
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3: strbt ip, [r0]
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#else
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2: strbt ip, [r0], #1
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3: strbt r2, [r0]
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#endif
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mov r0, #0
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mov pc, lr
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.global __put_user_4
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__put_user_4:
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4: strt r2, [r0]
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mov r0, #0
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mov pc, lr
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.global __put_user_8
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__put_user_8:
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5: strt r2, [r0], #4
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6: strt r3, [r0]
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mov r0, #0
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mov pc, lr
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__put_user_bad:
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mov r0, #-EFAULT
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mov pc, lr
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.section __ex_table, "a"
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.long 1b, __put_user_bad
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.long 2b, __put_user_bad
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.long 3b, __put_user_bad
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.long 4b, __put_user_bad
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.long 5b, __put_user_bad
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.long 6b, __put_user_bad
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.previous
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