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| /* SPDX-License-Identifier: GPL-2.0-or-later */
| /*
| * OpenRISC string.S
| *
| * Linux architectural port borrowing liberally from similar works of
| * others. All original copyrights apply as per the original source
| * declaration.
| *
| * Modifications for the OpenRISC architecture:
| * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
| * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
| */
|
| #include <linux/linkage.h>
| #include <asm/errno.h>
|
| /*
| * this can be optimized by doing gcc inline assemlby with
| * proper constraints (no need to save args registers...)
| *
| */
|
|
| /*
| *
| * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
| *
| * NOTE: it returns number of bytes NOT copied !!!
| *
| */
| .global __copy_tofrom_user
| __copy_tofrom_user:
| l.addi r1,r1,-12
| l.sw 0(r1),r6
| l.sw 4(r1),r4
| l.sw 8(r1),r3
|
| l.addi r11,r5,0
| 2: l.sfeq r11,r0
| l.bf 1f
| l.addi r11,r11,-1
| 8: l.lbz r6,0(r4)
| 9: l.sb 0(r3),r6
| l.addi r3,r3,1
| l.j 2b
| l.addi r4,r4,1
| 1:
| l.addi r11,r11,1 // r11 holds the return value
|
| l.lwz r6,0(r1)
| l.lwz r4,4(r1)
| l.lwz r3,8(r1)
| l.jr r9
| l.addi r1,r1,12
|
| .section .fixup, "ax"
| 99:
| l.j 1b
| l.nop
| .previous
|
| .section __ex_table, "a"
| .long 8b, 99b // read fault
| .long 9b, 99b // write fault
| .previous
|
| /*
| * unsigned long clear_user(void *addr, unsigned long size) ;
| *
| * NOTE: it returns number of bytes NOT cleared !!!
| */
| .global __clear_user
| __clear_user:
| l.addi r1,r1,-8
| l.sw 0(r1),r4
| l.sw 4(r1),r3
|
| 2: l.sfeq r4,r0
| l.bf 1f
| l.addi r4,r4,-1
| 9: l.sb 0(r3),r0
| l.j 2b
| l.addi r3,r3,1
|
| 1:
| l.addi r11,r4,1
|
| l.lwz r4,0(r1)
| l.lwz r3,4(r1)
| l.jr r9
| l.addi r1,r1,8
|
| .section .fixup, "ax"
| 99:
| l.j 1b
| l.nop
| .previous
|
| .section __ex_table, "a"
| .long 9b, 99b // write fault
| .previous
|
|
