diff options
Diffstat (limited to 'pr/src/md/unix/os_Linux_x86.s')
-rw-r--r-- | pr/src/md/unix/os_Linux_x86.s | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/pr/src/md/unix/os_Linux_x86.s b/pr/src/md/unix/os_Linux_x86.s new file mode 100644 index 00000000..f72f28d2 --- /dev/null +++ b/pr/src/md/unix/os_Linux_x86.s @@ -0,0 +1,95 @@ +/ -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- +/ +/ The contents of this file are subject to the Netscape Public License +/ Version 1.1 (the "NPL"); you may not use this file except in +/ compliance with the NPL. You may obtain a copy of the NPL at +/ http://www.mozilla.org/NPL/ +/ +/ Software distributed under the NPL is distributed on an "AS IS" basis, +/ WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL +/ for the specific language governing rights and limitations under the +/ NPL. +/ +/ The Initial Developer of this code under the NPL is Netscape +/ Communications Corporation. Portions created by Netscape are +/ Copyright (C) 2000 Netscape Communications Corporation. All Rights +/ Reserved. +/ + +/ PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val) +/ +/ Atomically increment the integer pointed to by 'val' and return +/ the result of the increment. +/ + .text + .globl _PR_x86_AtomicIncrement + .align 4 +_PR_x86_AtomicIncrement: + movl 4(%esp), %ecx + movl $1, %eax + lock + xaddl %eax, (%ecx) + incl %eax + ret + +/ PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val) +/ +/ Atomically decrement the integer pointed to by 'val' and return +/ the result of the decrement. +/ + .text + .globl _PR_x86_AtomicDecrement + .align 4 +_PR_x86_AtomicDecrement: + movl 4(%esp), %ecx + movl $-1, %eax + lock + xaddl %eax, (%ecx) + decl %eax + ret + +/ PRInt32 _PR_x86_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 _PR_x86_AtomicSet +/ .align 4 +/_PR_x86_AtomicSet: +/ movl 4(%esp), %ecx +/ movl 8(%esp), %edx +/ movl (%ecx), %eax +/retry: +/ lock +/ cmpxchgl %edx, (%ecx) +/ jne retry +/ ret +/ + .text + .globl _PR_x86_AtomicSet + .align 4 +_PR_x86_AtomicSet: + movl 4(%esp), %ecx + movl 8(%esp), %eax + lock + xchgl %eax, (%ecx) + ret + +/ PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val) +/ +/ Atomically add 'val' to the integer pointed to by 'ptr' +/ and return the result of the addition. +/ + .text + .globl _PR_x86_AtomicAdd + .align 4 +_PR_x86_AtomicAdd: + movl 4(%esp), %ecx + movl 8(%esp), %eax + movl %eax, %edx + lock + xaddl %eax, (%ecx) + addl %edx, %eax + ret |