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Diffstat (limited to 'sysdeps/vax/bcopy.s')
| -rw-r--r-- | sysdeps/vax/bcopy.s | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/sysdeps/vax/bcopy.s b/sysdeps/vax/bcopy.s new file mode 100644 index 0000000..43bb93d --- /dev/null +++ b/sysdeps/vax/bcopy.s @@ -0,0 +1,78 @@ +/* + * Copyright (c) 1983 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) + .asciz "@(#)bcopy.s 5.6 (Berkeley) 6/1/90" +#endif /* LIBC_SCCS and not lint */ + +/* bcopy(from, to, size) */ + +#include "DEFS.h" + +ENTRY(bcopy, R6) + movl 4(ap),r1 + movl 8(ap),r3 + movl 12(ap),r6 + cmpl r1,r3 + bgtr 2f # normal forward case + blss 3f # overlapping, must do backwards + ret # equal, nothing to do +1: + subl2 r0,r6 + movc3 r0,(r1),(r3) +2: + movzwl $65535,r0 + cmpl r6,r0 + jgtr 1b + movc3 r6,(r1),(r3) + ret +3: + addl2 r6,r1 + addl2 r6,r3 + movzwl $65535,r0 + jbr 5f +4: + subl2 r0,r6 + subl2 r0,r1 + subl2 r0,r3 + movc3 r0,(r1),(r3) + movzwl $65535,r0 + subl2 r0,r1 + subl2 r0,r3 +5: + cmpl r6,r0 + jgtr 4b + subl2 r6,r1 + subl2 r6,r3 + movc3 r6,(r1),(r3) + ret |