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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
- */
- #include <asm/asm.h>
- #include <asm/asmmacro.h>
- #include <asm/export.h>
- #include <asm/regdef.h>
- .macro fixup_ex from, to, offset, fix
- .if \fix
- .section .fixup, "ax"
- \to: addi.d a0, a2, \offset
- jr ra
- .previous
- .endif
- .section __ex_table, "a"
- PTR \from\()b, \to\()b
- .previous
- .endm
- /*
- * unsigned long __copy_user(void *to, const void *from, size_t n)
- *
- * a0: to
- * a1: from
- * a2: n
- */
- SYM_FUNC_START(__copy_user)
- beqz a2, 3f
- 1: ld.b t0, a1, 0
- 2: st.b t0, a0, 0
- addi.d a0, a0, 1
- addi.d a1, a1, 1
- addi.d a2, a2, -1
- bgtz a2, 1b
- 3: move a0, a2
- jr ra
- fixup_ex 1, 4, 0, 1
- fixup_ex 2, 4, 0, 0
- SYM_FUNC_END(__copy_user)
- EXPORT_SYMBOL(__copy_user)
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