44 lines
704 B
ArmAsm
44 lines
704 B
ArmAsm
|
/* 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
|
||
|
|
bgtz a1, 1b
|
||
|
|
|
||
|
|
2: move a0, a1
|
||
|
|
jr ra
|
||
|
|
|
||
|
|
fixup_ex 1, 3, 0, 1
|
||
|
|
SYM_FUNC_END(__clear_user)
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(__clear_user)
|