/* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /* 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)