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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/putuser.S
| *
| * Copyright (C) 2001 Russell King
| *
| * 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
| * r1 contains the address limit, which must be preserved
| * r2, r3 contains the value
| * Outputs: r0 is the error code
| * lr corrupted
| *
| * No other registers must be altered. (see <asm/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 <linux/linkage.h>
| #include <asm/assembler.h>
| #include <asm/errno.h>
| #include <asm/domain.h>
|
| ENTRY(__put_user_1)
| check_uaccess r0, 1, r1, ip, __put_user_bad
| 1: TUSER(strb) r2, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__put_user_1)
|
| ENTRY(__put_user_2)
| check_uaccess r0, 2, r1, ip, __put_user_bad
| #if __LINUX_ARM_ARCH__ >= 6
|
| 2: TUSER(strh) r2, [r0]
|
| #else
|
| mov ip, r2, lsr #8
| #ifndef __ARMEB__
| 2: TUSER(strb) r2, [r0], #1
| 3: TUSER(strb) ip, [r0]
| #else
| 2: TUSER(strb) ip, [r0], #1
| 3: TUSER(strb) r2, [r0]
| #endif
|
| #endif /* __LINUX_ARM_ARCH__ >= 6 */
| mov r0, #0
| ret lr
| ENDPROC(__put_user_2)
|
| ENTRY(__put_user_4)
| check_uaccess r0, 4, r1, ip, __put_user_bad
| 4: TUSER(str) r2, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__put_user_4)
|
| ENTRY(__put_user_8)
| check_uaccess r0, 8, r1, ip, __put_user_bad
| #ifdef CONFIG_THUMB2_KERNEL
| 5: TUSER(str) r2, [r0]
| 6: TUSER(str) r3, [r0, #4]
| #else
| 5: TUSER(str) r2, [r0], #4
| 6: TUSER(str) r3, [r0]
| #endif
| mov r0, #0
| ret lr
| ENDPROC(__put_user_8)
|
| __put_user_bad:
| mov r0, #-EFAULT
| ret lr
| ENDPROC(__put_user_bad)
|
| .pushsection __ex_table, "a"
| .long 1b, __put_user_bad
| .long 2b, __put_user_bad
| #if __LINUX_ARM_ARCH__ < 6
| .long 3b, __put_user_bad
| #endif
| .long 4b, __put_user_bad
| .long 5b, __put_user_bad
| .long 6b, __put_user_bad
| .popsection
|
|
