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+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#
+# Based on the programming examples in The PowerPC Architecture:
+# A Specification for A New Family of RISC Processors, 2nd Ed.,
+# Book I, Section E.1, "Synchronization," pp. 249-256, May 1994.
+#
+
+.text
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicIncrement(PRInt32 *val);
+#
+ .align 2
+ .globl __PR_DarwinPPC_AtomicIncrement
+ .private_extern __PR_DarwinPPC_AtomicIncrement
+__PR_DarwinPPC_AtomicIncrement:
+ lwarx r4,0,r3
+ addi r0,r4,1
+ stwcx. r0,0,r3
+ bne- __PR_DarwinPPC_AtomicIncrement
+ mr r3,r0
+ blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicDecrement(PRInt32 *val);
+#
+ .align 2
+ .globl __PR_DarwinPPC_AtomicDecrement
+ .private_extern __PR_DarwinPPC_AtomicDecrement
+__PR_DarwinPPC_AtomicDecrement:
+ lwarx r4,0,r3
+ addi r0,r4,-1
+ stwcx. r0,0,r3
+ bne- __PR_DarwinPPC_AtomicDecrement
+ mr r3,r0
+ blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicSet(PRInt32 *val, PRInt32 newval);
+#
+ .align 2
+ .globl __PR_DarwinPPC_AtomicSet
+ .private_extern __PR_DarwinPPC_AtomicSet
+__PR_DarwinPPC_AtomicSet:
+ lwarx r5,0,r3
+ stwcx. r4,0,r3
+ bne- __PR_DarwinPPC_AtomicSet
+ mr r3,r5
+ blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicAdd(PRInt32 *ptr, PRInt32 val);
+#
+ .align 2
+ .globl __PR_DarwinPPC_AtomicAdd
+ .private_extern __PR_DarwinPPC_AtomicAdd
+__PR_DarwinPPC_AtomicAdd:
+ lwarx r5,0,r3
+ add r0,r4,r5
+ stwcx. r0,0,r3
+ bne- __PR_DarwinPPC_AtomicAdd
+ mr r3,r0
+ blr