copy_from_user.S

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation

#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/errno.h>

.macro 	lbi1 dst, addr, adj
USER( lbi.bi, \dst, [\addr], \adj)
.endm

.macro 	sbi1 src, addr, adj
sbi.bi	\src, [\addr], \adj
.endm

.macro	lmw1 start_reg, addr, end_reg
USER( lmw.bim, \start_reg, [\addr], \end_reg)
.endm

.macro	smw1 start_reg, addr, end_reg
smw.bim \start_reg, [\addr], \end_reg
.endm


/* Prototype: int __arch_copy_from_user(void *to, const char *from, size_t n)
 * Purpose  : copy a block from user memory to kernel memory
 * Params   : to   - kernel memory
 *          : from - user memory
 *          : n    - number of bytes to copy
 * Returns  : Number of bytes NOT copied.
 */

.text
ENTRY(__arch_copy_from_user)
	add	$r5, $r0, $r2
#include "copy_template.S"
	move	$r0, $r2
	ret
.section .fixup,"ax"
.align  2
9001:
	sub	$r0, $r5, $r0
	ret
.previous
ENDPROC(__arch_copy_from_user)