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diff --git a/sysdeps/s390/s390-64/s390x-mcount.S b/sysdeps/s390/s390-64/s390x-mcount.S
new file mode 100644
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--- /dev/null
+++ b/sysdeps/s390/s390-64/s390x-mcount.S
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+/* 64 bit S/390-specific implemetation of profiling support.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com)
+   This file is part of the GNU C Library.
+
+   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.  */
+
+#include <sysdep.h>
+
+/* How profiling works on 64 bit S/390:
+   On the start of each function _mcount is called with the address of a
+   data word in %r1 (initialized to 0, used for counting). The compiler
+   with the option -p generates code of the form:
+  
+           STM    6,15,24(15)
+           BRAS   13,.LTN0_0
+   .LT0_0: 
+   .LC13:  .long  .LP0
+           .data
+           .align 4
+   .LP0:   .long  0
+           .text
+   # function profiler
+           stg    14,4(15)
+           lg     1,.LC13-.LT0_0(13)
+           brasl  14,_mcount
+           lg     14,4(15)
+  
+   The _mcount implementation now has to call __mcount_internal with the
+   address of .LP0 as first parameter and the return address as second
+   parameter. &.LP0 was loaded to %r1 and the return address is in %r14.
+   _mcount may not modify any register.  */
+
+	ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(_mcount)
+	ASM_TYPE_DIRECTIVE(C_SYMBOL_NAME(_mcount), @function)
+	.align ALIGNARG(4)
+C_LABEL(_mcount)
+	/* Save the caller-clobbered registers.  */
+        aghi  %r15,-224
+        stmg  %r14,%r5,160(%r15)
+        lg    %r2,232(%r15)       # callers address  = first parameter
+        la    %r2,0(%r2)          # clear bit 0
+        la    %r3,0(%r14)         # callees address  = second parameter
+
+#ifdef PIC
+	brasl %r14,__mcount_internal@PLT
+#else
+	brasl %r14,__mcount_internal
+#endif
+
+	/* Pop the saved registers.  Please note that `mcount' has no
+	   return value.  */
+	lmg   %r14,%r5,160(%r15)
+        ahi   %r15,224
+        br    %r14
+	ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
+
+#undef mcount
+weak_alias(_mcount, mcount)