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+! 
+! ***** BEGIN LICENSE BLOCK *****
+! Version: MPL 1.1/GPL 2.0/LGPL 2.1
+!
+! The contents of this file are subject to the Mozilla Public License Version
+! 1.1 (the "License"); you may not use this file except in compliance with
+! the License. You may obtain a copy of the License at
+! http://www.mozilla.org/MPL/
+!
+! Software distributed under the License is distributed on an "AS IS" basis,
+! WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+! for the specific language governing rights and limitations under the
+! License.
+!
+! The Original Code is Mozilla Communicator client code, released
+! March 31, 1998.
+!
+! The Initial Developer of the Original Code is
+! Netscape Communications Corporation.
+! Portions created by the Initial Developer are Copyright (C) 1998-1999
+! the Initial Developer. All Rights Reserved.
+!
+! Contributor(s):
+!
+! Alternatively, the contents of this file may be used under the terms of
+! either the GNU General Public License Version 2 or later (the "GPL"), or
+! the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+! in which case the provisions of the GPL or the LGPL are applicable instead
+! of those above. If you wish to allow use of your version of this file only
+! under the terms of either the GPL or the LGPL, and not to allow others to
+! use your version of this file under the terms of the MPL, indicate your
+! decision by deleting the provisions above and replace them with the notice
+! and other provisions required by the GPL or the LGPL. If you do not delete
+! the provisions above, a recipient may use your version of this file under
+! the terms of any one of the MPL, the GPL or the LGPL.
+!
+! ***** END LICENSE BLOCK *****
+
+!
+!  atomic compare-and-swap routines for V8+ (ultrasparc)
+!
+!  ======================================================================
+!
+!  Perform the sequence *a = b atomically with respect to previous value
+!  of a (a0). If *a==a0 then assign *a to b, all in one atomic operation.
+!  Returns 1 if assignment happened, and 0 otherwise.	
+!
+!  usage : old_val = compare_and_swap(address, oldval, newval)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [input]   - the old value to compare with	
+!     %o2  [input]   - the new value to set for [%o0]
+!     %o3  [local]   - work register
+!  -----------------------
+!  ======================================================================
+!
+!  v8plus
+
+    .inline NativeCompareAndSwap,3
+
+	stbar
+	cas [%o0],%o1,%o2               ! compare *w with old value and set to new if equal
+	cmp %o1,%o2                     ! did we succeed?
+	be,a 1f                         ! yes
+	mov 1,%o0                       ! return true (annulled when no jump)
+	mov 0,%o0                       ! return false
+1:
+
+    .end
+
+!
+!  end
+!
+!  ======================================================================
+!