96 lines
2.0 KiB
ArmAsm
96 lines
2.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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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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* 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 contains the address limit, which must be preserved
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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 <asm/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 <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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#include <asm/domain.h>
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ENTRY(__put_user_1)
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check_uaccess r0, 1, r1, ip, __put_user_bad
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1: TUSER(strb) r2, [r0]
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mov r0, #0
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ret lr
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ENDPROC(__put_user_1)
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ENTRY(__put_user_2)
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check_uaccess r0, 2, r1, ip, __put_user_bad
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#if __LINUX_ARM_ARCH__ >= 6
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2: TUSER(strh) r2, [r0]
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#else
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mov ip, r2, lsr #8
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#ifndef __ARMEB__
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2: TUSER(strb) r2, [r0], #1
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3: TUSER(strb) ip, [r0]
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#else
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2: TUSER(strb) ip, [r0], #1
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3: TUSER(strb) r2, [r0]
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#endif
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#endif /* __LINUX_ARM_ARCH__ >= 6 */
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mov r0, #0
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ret lr
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ENDPROC(__put_user_2)
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ENTRY(__put_user_4)
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check_uaccess r0, 4, r1, ip, __put_user_bad
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4: TUSER(str) r2, [r0]
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mov r0, #0
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ret lr
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ENDPROC(__put_user_4)
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ENTRY(__put_user_8)
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check_uaccess r0, 8, r1, ip, __put_user_bad
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#ifdef CONFIG_THUMB2_KERNEL
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5: TUSER(str) r2, [r0]
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6: TUSER(str) r3, [r0, #4]
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#else
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5: TUSER(str) r2, [r0], #4
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6: TUSER(str) r3, [r0]
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#endif
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mov r0, #0
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ret lr
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ENDPROC(__put_user_8)
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__put_user_bad:
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mov r0, #-EFAULT
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ret lr
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ENDPROC(__put_user_bad)
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.pushsection __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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#if __LINUX_ARM_ARCH__ < 6
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.long 3b, __put_user_bad
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#endif
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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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.popsection
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