1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 6#include <asm/asm.h> 7#include <asm/asmmacro.h> 8#include <asm/export.h> 9#include <asm/regdef.h> 10 11.macro fixup_ex from, to, offset, fix 12.if \fix 13 .section .fixup, "ax" 14\to: addi.d a0, a1, \offset 15 jr ra 16 .previous 17.endif 18 .section __ex_table, "a" 19 PTR \from\()b, \to\()b 20 .previous 21.endm 22 23/* 24 * unsigned long __clear_user(void *addr, size_t size) 25 * 26 * a0: addr 27 * a1: size 28 */ 29SYM_FUNC_START(__clear_user) 30 beqz a1, 2f 31 321: st.b zero, a0, 0 33 addi.d a0, a0, 1 34 addi.d a1, a1, -1 35 bgt a1, zero, 1b 36 372: move a0, a1 38 jr ra 39 40 fixup_ex 1, 3, 0, 1 41SYM_FUNC_END(__clear_user) 42 43EXPORT_SYMBOL(__clear_user) 44