| /* 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) |
