2019-03-11 03:26:37 -07:00
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val)
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//
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// Atomically increment the integer pointed to by 'val' and return
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// the result of the increment.
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//
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.text
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.globl _PR_x86_AtomicIncrement
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.align 4
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_PR_x86_AtomicIncrement:
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movl 4(%esp), %ecx
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movl $1, %eax
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lock
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xaddl %eax, (%ecx)
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incl %eax
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ret
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// PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val)
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//
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// Atomically decrement the integer pointed to by 'val' and return
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// the result of the decrement.
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//
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.text
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.globl _PR_x86_AtomicDecrement
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.align 4
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_PR_x86_AtomicDecrement:
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movl 4(%esp), %ecx
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movl $-1, %eax
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lock
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xaddl %eax, (%ecx)
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decl %eax
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ret
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// PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval)
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//
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// Atomically set the integer pointed to by 'val' to the new
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// value 'newval' and return the old value.
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//
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// An alternative implementation:
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// .text
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// .globl _PR_x86_AtomicSet
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// .align 4
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//_PR_x86_AtomicSet:
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// movl 4(%esp), %ecx
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// movl 8(%esp), %edx
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// movl (%ecx), %eax
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//retry:
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// lock
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// cmpxchgl %edx, (%ecx)
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// jne retry
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// ret
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//
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.text
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.globl _PR_x86_AtomicSet
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.align 4
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_PR_x86_AtomicSet:
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movl 4(%esp), %ecx
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movl 8(%esp), %eax
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xchgl %eax, (%ecx)
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ret
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// PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val)
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//
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// Atomically add 'val' to the integer pointed to by 'ptr'
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// and return the result of the addition.
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//
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.text
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.globl _PR_x86_AtomicAdd
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.align 4
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_PR_x86_AtomicAdd:
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movl 4(%esp), %ecx
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movl 8(%esp), %eax
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movl %eax, %edx
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lock
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xaddl %eax, (%ecx)
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addl %edx, %eax
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ret
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// Magic indicating no need for an executable stack
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2021-01-17 06:11:03 -08:00
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.section .note.GNU-stack, "", @progbits
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