1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/s390/bcopy.S b/sysdeps/s390/bcopy.S
new file mode 100644
index 0000000000..dafe9ee186
--- /dev/null
+++ b/sysdeps/s390/bcopy.S
@@ -0,0 +1,69 @@
+/* bcopy -- copy a block from source to destination.  For IBM S390
+   This file is part of the GNU C Library.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
+
+   The GNU C Library is free software  ; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation   ; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/*
+ * R2 = address of source
+ * R3 = address of destination
+ * R4 = number of bytes to copy
+ */
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+        .text
+ENTRY(__bcopy)
+        clr     %r2,%r3             # check against destructive overlap
+        jnl     .L0
+        lr      %r1,%r2
+        alr     %r1,%r4
+        clr     %r1,%r3
+        jh      .L2
+.L0:
+	lr      %r5,%r4		    # source length
+        lr      %r4,%r2             # source address
+        sr      %r1,%r1             # set pad byte to zero
+	lr      %r2,%r3             # set destination
+        lr      %r3,%r5             # destination length = source length
+.L1:    mvcle   %r2,%r4,0(%r1)      # thats it, MVCLE is your friend
+        jo      .L1
+        br      %r14
+.L2:                                # destructive overlay, can not use mvcle
+        lr     %r1,%r2              # bcopy is called with source,dest
+        lr     %r2,%r3              # memmove with dest,source! Oh, well...
+        lr     %r3,%r1
+        basr   %r1,0
+.L3:
+#ifdef PIC
+        al     %r1,.L4-.L3(%r1)     # get address of global offset table
+                                    # load address of memmove
+        l      %r1,memmove@GOT12(%r1)
+        br     %r1
+.L4:    .long  _GLOBAL_OFFSET_TABLE_-.L3
+#else
+        al     %r1,.L4-.L3(%r1)     # load address of memmove
+        br     %r1                  # jump to memmove
+.L4:    .long  memmove-.L3
+#endif
+
+END(__bcopy)
+
+#ifndef NO_WEAK_ALIAS
+weak_alias (__bcopy, bcopy)
+#endif