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diff --git a/nsprpub/pr/src/md/unix/os_SunOS_x86.s b/nsprpub/pr/src/md/unix/os_SunOS_x86.s
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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/.
+
+ .text
+
+ .globl getedi
+getedi:
+ movl %edi,%eax
+ ret
+ .type getedi,@function
+ .size getedi,.-getedi
+
+ .globl setedi
+setedi:
+ movl 4(%esp),%edi
+ ret
+ .type setedi,@function
+ .size setedi,.-setedi
+
+ .globl __MD_FlushRegisterWindows
+ .globl _MD_FlushRegisterWindows
+
+__MD_FlushRegisterWindows:
+_MD_FlushRegisterWindows:
+
+ ret
+
+//
+// sol_getsp()
+//
+// Return the current sp (for debugging)
+//
+ .globl sol_getsp
+sol_getsp:
+ movl %esp, %eax
+ ret
+
+//
+// sol_curthread()
+//
+// Return a unique identifier for the currently active thread.
+//
+ .globl sol_curthread
+sol_curthread:
+ movl %ecx, %eax
+ ret
+
+// PRInt32 _MD_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+ .text
+ .globl _MD_AtomicIncrement
+ .align 4
+_MD_AtomicIncrement:
+ movl 4(%esp), %ecx
+ movl $1, %eax
+ lock
+ xaddl %eax, (%ecx)
+ incl %eax
+ ret
+
+// PRInt32 _MD_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+ .text
+ .globl _MD_AtomicDecrement
+ .align 4
+_MD_AtomicDecrement:
+ movl 4(%esp), %ecx
+ movl $-1, %eax
+ lock
+ xaddl %eax, (%ecx)
+ decl %eax
+ ret
+
+// PRInt32 _MD_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+// An alternative implementation:
+// .text
+// .globl _MD_AtomicSet
+// .align 4
+//_MD_AtomicSet:
+// movl 4(%esp), %ecx
+// movl 8(%esp), %edx
+// movl (%ecx), %eax
+//retry:
+// lock
+// cmpxchgl %edx, (%ecx)
+// jne retry
+// ret
+//
+ .text
+ .globl _MD_AtomicSet
+ .align 4
+_MD_AtomicSet:
+ movl 4(%esp), %ecx
+ movl 8(%esp), %eax
+ xchgl %eax, (%ecx)
+ ret
+
+// PRInt32 _MD_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+ .text
+ .globl _MD_AtomicAdd
+ .align 4
+_MD_AtomicAdd:
+ movl 4(%esp), %ecx
+ movl 8(%esp), %eax
+ movl %eax, %edx
+ lock
+ xaddl %eax, (%ecx)
+ addl %edx, %eax
+ ret