/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 */

/* If dst and src are 4 byte aligned, copy 8 bytes at a time.
   If the src is 4, but not 8 byte aligned, we first read 4 bytes to get
   it 8 byte aligned.  Thus, we can do a little read-ahead, without
   dereferencing a cache line that we should not touch.
   Note that short and long instructions have been scheduled to avoid
   branch stalls.
   The beq_s to r3z could be made unaligned & long to avoid a stall
   there, but the it is not likely to be taken often, and it
   would also be likey to cost an unaligned mispredict at the next call.  */

#include <linux/linkage.h>

ENTRY_CFI(strcpy)
        or      r2,r0,r1
        bmsk_s  r2,r2,1
        brne.d  r2,0,charloop
        mov_s   r10,r0
        ld_s    r3,[r1,0]
        mov     r8,0x01010101
        bbit0.d r1,2,loop_start
        ror     r12,r8
        sub     r2,r3,r8
        bic_s   r2,r2,r3
        tst_s   r2,r12
        bne     r3z
        mov_s   r4,r3
        .balign 4
loop:
        ld.a    r3,[r1,4]
        st.ab   r4,[r10,4]
loop_start:
        ld.a    r4,[r1,4]
        sub     r2,r3,r8
        bic_s   r2,r2,r3
        tst_s   r2,r12
        bne_s   r3z
        st.ab   r3,[r10,4]
        sub     r2,r4,r8
        bic     r2,r2,r4
        tst     r2,r12
        beq     loop
        mov_s   r3,r4
#ifdef __LITTLE_ENDIAN__
r3z:    bmsk.f  r1,r3,7
        lsr_s   r3,r3,8
#else
r3z:    lsr.f   r1,r3,24
        asl_s   r3,r3,8
#endif
        bne.d   r3z
        stb.ab  r1,[r10,1]
        j_s     [blink]

        .balign 4
charloop:
        ldb.ab  r3,[r1,1]


        brne.d  r3,0,charloop
        stb.ab  r3,[r10,1]
        j       [blink]
END_CFI(strcpy)