1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/nsprpub/pr/src/md/unix/os_Linux_x86.s Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 +//
1.6 +// This Source Code Form is subject to the terms of the Mozilla Public
1.7 +// License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 +// file, You can obtain one at http://mozilla.org/MPL/2.0/.
1.9 +
1.10 +// PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val)
1.11 +//
1.12 +// Atomically increment the integer pointed to by 'val' and return
1.13 +// the result of the increment.
1.14 +//
1.15 + .text
1.16 + .globl _PR_x86_AtomicIncrement
1.17 + .align 4
1.18 +_PR_x86_AtomicIncrement:
1.19 + movl 4(%esp), %ecx
1.20 + movl $1, %eax
1.21 + lock
1.22 + xaddl %eax, (%ecx)
1.23 + incl %eax
1.24 + ret
1.25 +
1.26 +// PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val)
1.27 +//
1.28 +// Atomically decrement the integer pointed to by 'val' and return
1.29 +// the result of the decrement.
1.30 +//
1.31 + .text
1.32 + .globl _PR_x86_AtomicDecrement
1.33 + .align 4
1.34 +_PR_x86_AtomicDecrement:
1.35 + movl 4(%esp), %ecx
1.36 + movl $-1, %eax
1.37 + lock
1.38 + xaddl %eax, (%ecx)
1.39 + decl %eax
1.40 + ret
1.41 +
1.42 +// PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval)
1.43 +//
1.44 +// Atomically set the integer pointed to by 'val' to the new
1.45 +// value 'newval' and return the old value.
1.46 +//
1.47 +// An alternative implementation:
1.48 +// .text
1.49 +// .globl _PR_x86_AtomicSet
1.50 +// .align 4
1.51 +//_PR_x86_AtomicSet:
1.52 +// movl 4(%esp), %ecx
1.53 +// movl 8(%esp), %edx
1.54 +// movl (%ecx), %eax
1.55 +//retry:
1.56 +// lock
1.57 +// cmpxchgl %edx, (%ecx)
1.58 +// jne retry
1.59 +// ret
1.60 +//
1.61 + .text
1.62 + .globl _PR_x86_AtomicSet
1.63 + .align 4
1.64 +_PR_x86_AtomicSet:
1.65 + movl 4(%esp), %ecx
1.66 + movl 8(%esp), %eax
1.67 + xchgl %eax, (%ecx)
1.68 + ret
1.69 +
1.70 +// PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val)
1.71 +//
1.72 +// Atomically add 'val' to the integer pointed to by 'ptr'
1.73 +// and return the result of the addition.
1.74 +//
1.75 + .text
1.76 + .globl _PR_x86_AtomicAdd
1.77 + .align 4
1.78 +_PR_x86_AtomicAdd:
1.79 + movl 4(%esp), %ecx
1.80 + movl 8(%esp), %eax
1.81 + movl %eax, %edx
1.82 + lock
1.83 + xaddl %eax, (%ecx)
1.84 + addl %edx, %eax
1.85 + ret
1.86 +
1.87 +// Magic indicating no need for an executable stack
1.88 +.section .note.GNU-stack, "", @progbits ; .previous
