From c08b07bc9bff10988100653d280e8afe428249f7 Mon Sep 17 00:00:00 2001 From: Ricard Wanderlof Date: Mon, 12 Nov 2007 12:08:31 +0000 Subject: CRIS/CRISv32 architecture specific memcpy, memmove and memset. --- libc/string/cris/memmove.c | 101 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 libc/string/cris/memmove.c (limited to 'libc/string/cris/memmove.c') diff --git a/libc/string/cris/memmove.c b/libc/string/cris/memmove.c new file mode 100644 index 000000000..437637078 --- /dev/null +++ b/libc/string/cris/memmove.c @@ -0,0 +1,101 @@ +/* Taken from generic/memmove.c; trivially modified to work with + arch-specific memcopy.h for Cris. + + Copy memory to memory until the specified number of bytes + has been copied. Overlap is handled correctly. + Copyright (C) 1991, 1995, 1996, 1997, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Torbjorn Granlund (tege@sics.se). + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + +#include "memcopy.h" +#include "../generic/pagecopy.h" + +libc_hidden_proto(memmove) +void *memmove (void *dest, const void *src, size_t len) +{ + unsigned long int dstp = (long int) dest; + unsigned long int srcp = (long int) src; + + /* This test makes the forward copying code be used whenever possible. + Reduces the working set. */ + if (dstp - srcp >= len) /* *Unsigned* compare! */ + { +#if 1 +#warning REMINDER: Cris arch-opt memmove assumes memcpy does forward copying! + memcpy(dest, src, len); +#else + /* Copy from the beginning to the end. */ + + /* If there not too few bytes to copy, use word copy. */ + if (len >= OP_T_THRES) + { + /* Copy just a few bytes to make DSTP aligned. */ + len -= (-dstp) % OPSIZ; + BYTE_COPY_FWD (dstp, srcp, (-dstp) % OPSIZ); + + /* Copy whole pages from SRCP to DSTP by virtual address + manipulation, as much as possible. */ + + PAGE_COPY_FWD_MAYBE (dstp, srcp, len, len); + + /* Copy from SRCP to DSTP taking advantage of the known + alignment of DSTP. Number of bytes remaining is put + in the third argument, i.e. in LEN. This number may + vary from machine to machine. */ + + WORD_COPY_FWD (dstp, srcp, len, len); + + /* Fall out and copy the tail. */ + } + + /* There are just a few bytes to copy. Use byte memory operations. */ + BYTE_COPY_FWD (dstp, srcp, len); +#endif + } + else + { + /* Copy from the end to the beginning. */ + srcp += len; + dstp += len; + + /* If there not too few bytes to copy, use word copy. */ + if (len >= OP_T_THRES) + { + /* Copy just a few bytes to make DSTP aligned. */ + len -= dstp % OPSIZ; + BYTE_COPY_BWD (dstp, srcp, dstp % OPSIZ); + + /* Copy from SRCP to DSTP taking advantage of the known + alignment of DSTP. Number of bytes remaining is put + in the third argument, i.e. in LEN. This number may + vary from machine to machine. */ + + WORD_COPY_BWD (dstp, srcp, len, len); + + /* Fall out and copy the tail. */ + } + + /* There are just a few bytes to copy. Use byte memory operations. */ + BYTE_COPY_BWD (dstp, srcp, len); + } + + return (dest); +} +libc_hidden_def(memmove) -- cgit v1.2.3