From e64ac02c24b43659048622714afdc92fedf561fa Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Sun, 1 Jul 2012 13:06:41 +0000 Subject: Move all files into ports/ subdirectory in preparation for merge with glibc --- ports/sysdeps/arm/memset.S | 64 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 ports/sysdeps/arm/memset.S (limited to 'ports/sysdeps/arm/memset.S') diff --git a/ports/sysdeps/arm/memset.S b/ports/sysdeps/arm/memset.S new file mode 100644 index 0000000000..a29031c266 --- /dev/null +++ b/ports/sysdeps/arm/memset.S @@ -0,0 +1,64 @@ +/* Copyright (C) 1998, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Philip Blundell + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#include + +/* void *memset (dstpp, c, len) */ + +ENTRY(memset) + mov r3, r0 + cmp r2, #8 + bcc 2f @ less than 8 bytes to move + +1: + tst r3, #3 @ aligned yet? + strneb r1, [r3], #1 + subne r2, r2, #1 + bne 1b + + and r1, r1, #255 @ clear any sign bits + orr r1, r1, r1, lsl $8 + orr r1, r1, r1, lsl $16 + mov ip, r1 + +1: + subs r2, r2, #8 + stmcsia r3!, {r1, ip} @ store up to 32 bytes per loop iteration + subcss r2, r2, #8 + stmcsia r3!, {r1, ip} + subcss r2, r2, #8 + stmcsia r3!, {r1, ip} + subcss r2, r2, #8 + stmcsia r3!, {r1, ip} + bcs 1b + + and r2, r2, #7 +2: + subs r2, r2, #1 @ store up to 4 bytes per loop iteration + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + subcss r2, r2, #1 + strcsb r1, [r3], #1 + bcs 2b + + DO_RET(lr) +END(memset) +libc_hidden_builtin_def (memset) -- cgit v1.2.3