copy_from_user.S
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// 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)