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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (C) 2012 ARM Ltd.
- */
- #include <linux/linkage.h>
- #include <asm/asm-uaccess.h>
- #include <asm/assembler.h>
- #include <asm/cache.h>
- /*
- * Copy to user space from a kernel buffer (alignment handled by the hardware)
- *
- * Parameters:
- * x0 - to
- * x1 - from
- * x2 - n
- * Returns:
- * x0 - bytes not copied
- */
- .macro ldrb1 reg, ptr, val
- ldrb \reg, [\ptr], \val
- .endm
- .macro strb1 reg, ptr, val
- uao_user_alternative 9998f, strb, sttrb, \reg, \ptr, \val
- .endm
- .macro ldrh1 reg, ptr, val
- ldrh \reg, [\ptr], \val
- .endm
- .macro strh1 reg, ptr, val
- uao_user_alternative 9997f, strh, sttrh, \reg, \ptr, \val
- .endm
- .macro ldr1 reg, ptr, val
- ldr \reg, [\ptr], \val
- .endm
- .macro str1 reg, ptr, val
- uao_user_alternative 9997f, str, sttr, \reg, \ptr, \val
- .endm
- .macro ldp1 reg1, reg2, ptr, val
- ldp \reg1, \reg2, [\ptr], \val
- .endm
- .macro stp1 reg1, reg2, ptr, val
- uao_stp 9997f, \reg1, \reg2, \ptr, \val
- .endm
- end .req x5
- srcin .req x15
- SYM_FUNC_START(__arch_copy_to_user)
- add end, x0, x2
- mov srcin, x1
- #include "copy_template.S"
- mov x0, #0
- ret
- SYM_FUNC_END(__arch_copy_to_user)
- EXPORT_SYMBOL(__arch_copy_to_user)
- .section .fixup,"ax"
- .align 2
- 9997: cmp dst, dstin
- b.ne 9998f
- // Before being absolutely sure we couldn't copy anything, try harder
- ldrb tmp1w, [srcin]
- USER(9998f, sttrb tmp1w, [dst])
- add dst, dst, #1
- 9998: sub x0, end, dst // bytes not copied
- ret
- .previous
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