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110 lines
2.8 KiB
110 lines
2.8 KiB
20 years ago
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/*
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* linux/arch/arm26/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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* r1, r2 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/asm_offsets.h>
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#include <asm/thread_info.h>
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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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bic r2, sp, #0x1f00
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bic r2, r2, #0x00ff
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str lr, [sp, #-4]!
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ldr r2, [r2, #TI_ADDR_LIMIT]
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sub r2, r2, #1
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cmp r0, r2
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bge __put_user_bad
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1: cmp r0, #0x02000000
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strlsbt r1, [r0]
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strgeb r1, [r0]
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mov r0, #0
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ldmfd sp!, {pc}^
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.global __put_user_2
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__put_user_2:
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bic r2, sp, #0x1f00
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bic r2, r2, #0x00ff
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str lr, [sp, #-4]!
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ldr r2, [r2, #TI_ADDR_LIMIT]
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sub r2, r2, #2
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cmp r0, r2
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bge __put_user_bad
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2: cmp r0, #0x02000000
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strlsbt r1, [r0], #1
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strgeb r1, [r0], #1
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mov r1, r1, lsr #8
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3: strlsbt r1, [r0]
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strgeb r1, [r0]
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mov r0, #0
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ldmfd sp!, {pc}^
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.global __put_user_4
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__put_user_4:
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bic r2, sp, #0x1f00
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bic r2, r2, #0x00ff
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str lr, [sp, #-4]!
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ldr r2, [r2, #TI_ADDR_LIMIT]
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sub r2, r2, #4
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cmp r0, r2
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4: bge __put_user_bad
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cmp r0, #0x02000000
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strlst r1, [r0]
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strge r1, [r0]
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mov r0, #0
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ldmfd sp!, {pc}^
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.global __put_user_8
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__put_user_8:
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bic ip, sp, #0x1f00
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bic ip, ip, #0x00ff
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str lr, [sp, #-4]!
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ldr ip, [ip, #TI_ADDR_LIMIT]
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sub ip, ip, #8
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cmp r0, ip
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bge __put_user_bad
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cmp r0, #0x02000000
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5: strlst r1, [r0], #4
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6: strlst r2, [r0]
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strge r1, [r0], #4
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strge r2, [r0]
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mov r0, #0
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ldmfd sp!, {pc}^
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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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