cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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string.S (1838B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * OpenRISC string.S
      4 *
      5 * Linux architectural port borrowing liberally from similar works of
      6 * others.  All original copyrights apply as per the original source
      7 * declaration.
      8 *
      9 * Modifications for the OpenRISC architecture:
     10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
     11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
     12 */
     13
     14#include <linux/linkage.h>
     15#include <asm/errno.h>
     16
     17	/*
     18	 * this can be optimized by doing gcc inline assemlby with
     19	 * proper constraints (no need to save args registers...)
     20	 *
     21	 */
     22
     23
     24/*
     25 *
     26 * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
     27 *
     28 * NOTE: it returns number of bytes NOT copied !!!
     29 *
     30 */
     31	.global	__copy_tofrom_user
     32__copy_tofrom_user:
     33	l.addi  r1,r1,-12
     34	l.sw    0(r1),r6
     35	l.sw    4(r1),r4
     36	l.sw    8(r1),r3
     37
     38	l.addi  r11,r5,0
     392:  	l.sfeq  r11,r0
     40	l.bf    1f
     41	l.addi  r11,r11,-1
     428:    	l.lbz   r6,0(r4)
     439:    	l.sb    0(r3),r6
     44	l.addi  r3,r3,1
     45	l.j     2b
     46	l.addi  r4,r4,1
     471:
     48	l.addi  r11,r11,1               // r11 holds the return value
     49
     50	l.lwz   r6,0(r1)
     51	l.lwz   r4,4(r1)
     52	l.lwz   r3,8(r1)
     53	l.jr    r9
     54	l.addi  r1,r1,12
     55
     56	.section .fixup, "ax"
     5799:
     58		l.j     1b
     59		l.nop
     60	.previous
     61
     62	.section __ex_table, "a"
     63		.long 8b, 99b		// read fault
     64		.long 9b, 99b		// write fault
     65	.previous
     66
     67/*
     68 * unsigned long clear_user(void *addr, unsigned long size) ;
     69 *
     70 * NOTE: it returns number of bytes NOT cleared !!!
     71 */
     72	.global	__clear_user
     73__clear_user:
     74	l.addi  r1,r1,-8
     75	l.sw    0(r1),r4
     76	l.sw    4(r1),r3
     77
     782:	l.sfeq	r4,r0
     79	l.bf	1f
     80	l.addi	r4,r4,-1
     819:	l.sb	0(r3),r0
     82	l.j	2b
     83	l.addi  r3,r3,1
     84
     851:
     86	l.addi  r11,r4,1
     87
     88	l.lwz	r4,0(r1)
     89	l.lwz	r3,4(r1)
     90	l.jr	r9
     91	l.addi	r1,r1,8
     92
     93	.section .fixup, "ax"
     9499:
     95		l.j     1b
     96		l.nop
     97	.previous
     98
     99	.section __ex_table, "a"
    100		.long 9b, 99b		// write fault
    101	.previous