From e130b681c43ee2215512ffcf6cadcbc4487e96e6 Mon Sep 17 00:00:00 2001 From: Carmelo Amoroso Date: Fri, 16 Nov 2007 14:26:46 +0000 Subject: Added AVR32 support to uClibc. Signed-off-by: Hans-Christian Egtvedt --- libc/string/avr32/memmove.S | 116 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 libc/string/avr32/memmove.S (limited to 'libc/string/avr32/memmove.S') diff --git a/libc/string/avr32/memmove.S b/libc/string/avr32/memmove.S new file mode 100644 index 000000000..659cdd199 --- /dev/null +++ b/libc/string/avr32/memmove.S @@ -0,0 +1,116 @@ +/* + * Copyright (C) 2004-2007 Atmel Corporation + * + * This file is subject to the terms and conditions of the GNU Lesser General + * Public License. See the file "COPYING.LIB" in the main directory of this + * archive for more details. + */ + +#define dst r12 +#define src r11 +#define len r10 + + .text + .global memmove + .type memmove, @function +memmove: + cp.w src, dst + brge __GI_memcpy + + add dst, len + add src, len + pref src[-1] + + /* + * The rest is basically the same as in memcpy.S except that + * the direction is reversed. + */ + cp.w len, 32 + brge .Lmore_than_31 + + sub len, 1 + retlt r12 +1: ld.ub r8, --src + st.b --dst, r8 + sub len, 1 + brge 1b + retal r12 + +.Lmore_than_31: + pushm r0-r7, lr + + /* Check alignment */ + mov r8, src + andl r8, 31, COH + brne .Lunaligned_src + mov r8, r12 + andl r8, 3, COH + brne .Lunaligned_dst + +.Laligned_copy: + sub len, 32 + brlt .Lless_than_32 + +1: /* Copy 32 bytes at a time */ + sub src, 32 + ldm src, r0-r7 + sub dst, 32 + sub len, 32 + stm dst, r0-r7 + brge 1b + +.Lless_than_32: + /* Copy 16 more bytes if possible */ + sub len, -16 + brlt .Lless_than_16 + sub src, 16 + ldm src, r0-r3 + sub dst, 16 + sub len, 16 + stm dst, r0-r3 + +.Lless_than_16: + /* Do the remaining as byte copies */ + sub len, -16 + breq 2f +1: ld.ub r0, --src + st.b --dst, r0 + sub len, 1 + brne 1b + +2: popm r0-r7, pc + +.Lunaligned_src: + /* Make src cacheline-aligned. r8 = (src & 31) */ + sub len, r8 +1: ld.ub r0, --src + st.b --dst, r0 + sub r8, 1 + brne 1b + + /* If dst is word-aligned, we're ready to go */ + pref src[-4] + mov r8, 3 + tst dst, r8 + breq .Laligned_copy + +.Lunaligned_dst: + /* src is aligned, but dst is not. Expect bad performance */ + sub len, 4 + brlt 2f +1: ld.w r0, --src + st.w --dst, r0 + sub len, 4 + brge 1b + +2: neg len + add pc, pc, len << 2 + .rept 3 + ld.ub r0, --src + st.b --dst, r0 + .endr + + popm r0-r7, pc + .size memmove, . - memmove + +libc_hidden_def(memmove) -- cgit v1.2.3