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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strcpy.S (1498B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
      3
      4#include <linux/linkage.h>
      5#include "sysdep.h"
      6
      7ENTRY(strcpy)
      8	mov	a3, a0
      9	/* Check if the src addr is aligned.  */
     10        andi    t0, a1, 3
     11        bnez	t0, 11f
     121:
     13	/* Check if all the bytes in the word are not zero.  */
     14	ldw	a2, (a1)
     15	tstnbz	a2
     16	bf	9f
     17	stw	a2, (a3)
     18
     19	ldw	a2, (a1, 4)
     20	tstnbz	a2
     21	bf	2f
     22	stw	a2, (a3, 4)
     23
     24	ldw	a2, (a1, 8)
     25	tstnbz	a2
     26	bf	3f
     27	stw	a2, (a3, 8)
     28
     29	ldw	a2, (a1, 12)
     30	tstnbz	a2
     31	bf	4f
     32	stw	a2, (a3, 12)
     33
     34	ldw	a2, (a1, 16)
     35	tstnbz	a2
     36	bf	5f
     37	stw	a2, (a3, 16)
     38
     39	ldw	a2, (a1, 20)
     40	tstnbz	a2
     41	bf	6f
     42	stw	a2, (a3, 20)
     43
     44	ldw	a2, (a1, 24)
     45	tstnbz	a2
     46	bf	7f
     47	stw	a2, (a3, 24)
     48
     49	ldw	a2, (a1, 28)
     50	tstnbz	a2
     51	bf	8f
     52	stw	a2, (a3, 28)
     53
     54	addi	a3, 32
     55	addi	a1, 32
     56	br	1b
     57
     58
     592:
     60	addi	a3, 4
     61	br	9f
     62
     633:
     64	addi	a3, 8
     65	br	9f
     66
     674:
     68	addi	a3, 12
     69	br	9f
     70
     715:
     72	addi	a3, 16
     73	br	9f
     74
     756:
     76	addi	a3, 20
     77	br	9f
     78
     797:
     80	addi	a3, 24
     81	br	9f
     82
     838:
     84	addi	a3, 28
     859:
     86# ifdef __CSKYBE__
     87	xtrb0	t0, a2
     88	st.b	t0, (a3)
     89	bez	t0, 10f
     90	xtrb1	t0, a2
     91	st.b	t0, (a3, 1)
     92	bez	t0, 10f
     93	xtrb2	t0, a2
     94	st.b	t0, (a3, 2)
     95	bez	t0, 10f
     96	stw	a2, (a3)
     97# else
     98	xtrb3	t0, a2
     99	st.b	t0, (a3)
    100	bez	t0, 10f
    101	xtrb2	t0, a2
    102	st.b	t0, (a3, 1)
    103	bez	t0, 10f
    104	xtrb1	t0, a2
    105	st.b	t0, (a3, 2)
    106	bez	t0, 10f
    107	stw	a2, (a3)
    108# endif	/* !__CSKYBE__ */
    10910:
    110	jmp	lr
    111
    11211:
    113	subi    t0, 4
    11412:
    115        ld.b    a2, (a1)
    116        st.b	a2, (a3)
    117        bez	a2, 10b
    118	addi    t0, 1
    119        addi    a1, a1, 1
    120        addi    a3, a3, 1
    121	bnez	t0, 12b
    122	jbr	1b
    123ENDPROC(strcpy)