| /* 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, a1, \offset |
| jr ra |
| .previous |
| .endif |
| .section __ex_table, "a" |
| PTR \from\()b, \to\()b |
| .previous |
| .endm |
| |
| /* |
| * unsigned long __clear_user(void *addr, size_t size) |
| * |
| * a0: addr |
| * a1: size |
| */ |
| SYM_FUNC_START(__clear_user) |
| beqz a1, 2f |
| |
| 1: st.b zero, a0, 0 |
| addi.d a0, a0, 1 |
| addi.d a1, a1, -1 |
| bgt a1, zero, 1b |
| |
| 2: move a0, a1 |
| jr ra |
| |
| fixup_ex 1, 3, 0, 1 |
| SYM_FUNC_END(__clear_user) |
| |
| EXPORT_SYMBOL(__clear_user) |
