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85 lines
3.2 KiB
Plaintext
85 lines
3.2 KiB
Plaintext
!
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! ***** BEGIN LICENSE BLOCK *****
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! Version: MPL 1.1/GPL 2.0/LGPL 2.1
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!
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! The contents of this file are subject to the Mozilla Public License Version
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! 1.1 (the "License"); you may not use this file except in compliance with
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! the License. You may obtain a copy of the License at
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! http://www.mozilla.org/MPL/
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!
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! Software distributed under the License is distributed on an "AS IS" basis,
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! WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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! for the specific language governing rights and limitations under the
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! License.
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!
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! The Original Code is Mozilla Communicator client code, released
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! March 31, 1998.
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!
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! The Initial Developer of the Original Code is
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! Netscape Communications Corporation.
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! Portions created by the Initial Developer are Copyright (C) 1998-1999
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! the Initial Developer. All Rights Reserved.
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!
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! Contributor(s):
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!
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! Alternatively, the contents of this file may be used under the terms of
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! either the GNU General Public License Version 2 or later (the "GPL"), or
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! the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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! in which case the provisions of the GPL or the LGPL are applicable instead
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! of those above. If you wish to allow use of your version of this file only
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! under the terms of either the GPL or the LGPL, and not to allow others to
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! use your version of this file under the terms of the MPL, indicate your
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! decision by deleting the provisions above and replace them with the notice
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! and other provisions required by the GPL or the LGPL. If you do not delete
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! the provisions above, a recipient may use your version of this file under
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! the terms of any one of the MPL, the GPL or the LGPL.
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!
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! ***** END LICENSE BLOCK *****
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!
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! atomic compare-and-swap routines for V9 (ultrasparc)
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!
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! ======================================================================
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!
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! Perform the sequence *a = b atomically with respect to previous value
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! of a (a0). If *a==a0 then assign *a to b, all in one atomic operation.
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! Returns 1 if assignment happened, and 0 otherwise.
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!
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! usage : old_val = compare_and_swap(address, oldval, newval)
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!
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! -----------------------
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! Note on REGISTER USAGE:
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! as this is a LEAF procedure, a new stack frame is not created;
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! we use the caller stack frame so what would normally be %i (input)
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! registers are actually %o (output registers). Also, we must not
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! overwrite the contents of %l (local) registers as they are not
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! assumed to be volatile during calls.
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!
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! So, the registers used are:
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! %o0 [input] - the address of the value to increment
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! %o1 [input] - the old value to compare with
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! %o2 [input] - the new value to set for [%o0]
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! %o3 [local] - work register
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! -----------------------
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! ======================================================================
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!
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! v9
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.inline NativeCompareAndSwap,3
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stbar
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casx [%o0],%o1,%o2 ! compare *w with old value and set to new if equal
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cmp %o1,%o2 ! did we succeed?
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be,a 1f ! yes
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mov 1,%o0 ! return true (annulled when no jump)
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mov 0,%o0 ! return false
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1:
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.end
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!
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! end
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!
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! ======================================================================
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!
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