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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /nsprpub/pr/src/md/os2/os2emx.s
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'nsprpub/pr/src/md/os2/os2emx.s')
-rw-r--r--nsprpub/pr/src/md/os2/os2emx.s82
1 files changed, 82 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/os2/os2emx.s b/nsprpub/pr/src/md/os2/os2emx.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/.
+
+/ PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
+/
+/ Atomically increment the integer pointed to by 'val' and return
+/ the result of the increment.
+/
+ .text
+ .globl __PR_MD_ATOMIC_INCREMENT
+ .align 4
+__PR_MD_ATOMIC_INCREMENT:
+ movl 4(%esp), %ecx
+ movl $1, %eax
+ lock
+ xaddl %eax, (%ecx)
+ incl %eax
+ ret
+
+/ PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
+/
+/ Atomically decrement the integer pointed to by 'val' and return
+/ the result of the decrement.
+/
+ .text
+ .globl __PR_MD_ATOMIC_DECREMENT
+ .align 4
+__PR_MD_ATOMIC_DECREMENT:
+ movl 4(%esp), %ecx
+ movl $-1, %eax
+ lock
+ xaddl %eax, (%ecx)
+ decl %eax
+ ret
+
+/ PRInt32 __PR_MD_ATOMIC_SET(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_MD_ATOMIC_SET
+/ .align 4
+/__PR_MD_ATOMIC_SET:
+/ movl 4(%esp), %ecx
+/ movl 8(%esp), %edx
+/ movl (%ecx), %eax
+/retry:
+/ lock
+/ cmpxchgl %edx, (%ecx)
+/ jne retry
+/ ret
+/
+ .text
+ .globl __PR_MD_ATOMIC_SET
+ .align 4
+__PR_MD_ATOMIC_SET:
+ movl 4(%esp), %ecx
+ movl 8(%esp), %eax
+ xchgl %eax, (%ecx)
+ ret
+
+/ PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+/
+/ Atomically add 'val' to the integer pointed to by 'ptr'
+/ and return the result of the addition.
+/
+ .text
+ .globl __PR_MD_ATOMIC_ADD
+ .align 4
+__PR_MD_ATOMIC_ADD:
+ movl 4(%esp), %ecx
+ movl 8(%esp), %eax
+ movl %eax, %edx
+ lock
+ xaddl %eax, (%ecx)
+ addl %edx, %eax
+ ret