atomicops.s
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- ; ***** BEGIN LICENSE BLOCK *****
- ; Source last modified: $Id: atomicops.s,v 1.1.32.3 2004/07/09 01:47:15 hubbe Exp $
- ;
- ; # Portions Copyright (c) 1995-2003 RealNetworks, Inc. All Rights Reserved.
- ;
- ; The contents of this file, and the files included with this file,
- ; are subject to the current version of the RealNetworks Public
- ; Source License (the "RPSL") available at
- ; http://www.helixcommunity.org/content/rpsl unless you have licensed
- ; the file under the current version of the RealNetworks Community
- ; Source License (the "RCSL") available at
- ; http://www.helixcommunity.org/content/rcsl, in which case the RCSL
- ; will apply. You may also obtain the license terms directly from
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- ; to this file, the RCSL. Please see the applicable RPSL or RCSL for
- ; the rights, obligations and limitations governing use of the
- ; contents of the file.
- ;
- ; Alternatively, the contents of this file may be used under the
- ; terms of the GNU General Public License Version 2 or later (the
- ; "GPL") in which case the provisions of the GPL are applicable
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- ; ***** END LICENSE BLOCK *****
- #######################################################################
- #
- # atomicops.s - AIX/PowerPC atomic add and subtract
- #
- #######################################################################
- #
- # Notes:
- #
- # XXXDC: Uses lwarx/stwcx to achieve a fast atomic update, only available
- # on PPC or later, so you need to compile everything with -Wa,-m,ppc.
- #
- # Calling convention is arg1 is in GPR3, arg2 is in GPR4, etc.
- # Return value is placed in GPR3 prior to returning.
- #
- # Used by common/pub/atomicbase.h
- #
- #######################################################################
- # define registers to use
- .set r3,3
- .set r4,4
- .set r5,5
- #######################################################################
- #
- # Interface:
- # INT32 _HXAtomicAddRetINT32(INT32* pNum, INT32 nNum);
- #
- # Inputs:
- # Paramaters:
- # GPR3 : INT32* pNum - pointer to integer to modify
- # GPR4 : INT32 nNum - amount to increment by
- #
- # Outputs:
- # Modifies memory at *pNum:
- # *pNum = *pNum + nNum
- #
- # Return value:
- # GPR3 : INT32 - new value of *pNum
- #
- .globl ._HXAtomicAddRetINT32
- ._HXAtomicAddRetINT32:
- lwarx r5,0,r3 # Load r5 w/ *pNum, set reserve flag
- addc r5,r4,r5 # add GPR4 to r5
- stwcx. r5,0,r3 # Store r5 in *pNum if flag still set
- bne- ._HXAtomicAddRetINT32 # retry if store failed
- addi r3,r5,0 # Save return value in r3
- br # return from routine
- #######################################################################
- #
- # Interface:
- # INT32 _HXAtomicSubRetINT32(INT32* pNum, INT32 nNum);
- #
- # Inputs:
- # Paramaters:
- # GPR3 : INT32* pNum - pointer to integer to modify
- # GPR4 : INT32 nNum - amount to decrement by
- #
- # Outputs:
- # Modifies memory at *pNum:
- # *pNum = *pNum + nNum
- #
- # Return value:
- # GPR3 : INT32 - new value of *pNum
- #
- .globl ._HXAtomicSubRetINT32
- ._HXAtomicSubRetINT32:
- lwarx r5,0,r3 # Load r5 w/ *pNum, set reserve flag
- subf r5,r4,r5 # subtract GPR4 from r5
- stwcx. r5,0,r3 # Store r5 in *pNum if flag still set
- bne- ._HXAtomicSubRetINT32 # retry if store failed
- addi r3,r5,0 # Save return value in r3
- br # return from routine
- #######################################################################
- #
- # Interface:
- # UINT32 HXAtomicAddRetUINT32(UINT32* pNum, UINT32 nNum);
- #
- # Inputs:
- # Paramaters:
- # GPR3 : UINT32* pNum - pointer to integer to modify
- # GPR4 : UINT32 nNum - amount to increment by
- #
- # Outputs:
- # Modifies memory at *pNum:
- # *pNum = *pNum + nNum
- #
- # Return value:
- # GPR3 : UINT32 - new value of *pNum
- #
- .globl ._HXAtomicAddRetUINT32
- ._HXAtomicAddRetUINT32:
- lwarx r5,0,r3 # Load r5 w/ *pNum, set reserve flag
- addc r5,r4,r5 # add GPR4 to r5
- stwcx. r5,0,r3 # Store r5 in *pNum if flag still set
- bne- ._HXAtomicAddRetUINT32 # retry if store failed
- addi r3,r5,0 # Save return value in r3
- br # return from routine
- #######################################################################
- #
- # Interface:
- # UINT32 HXAtomicSubRetUINT32(UINT32* pNum, UINT32 nNum);
- #
- # Inputs:
- # Paramaters:
- # GPR3 : UINT32* pNum - pointer to integer to modify
- # GPR4 : UINT32 nNum - amount to decrement by
- #
- # Outputs:
- # Modifies memory at *pNum:
- # *pNum = *pNum + nNum
- #
- # Return value:
- # GPR3 : UINT32 - new value of *pNum
- #
- .globl ._HXAtomicSubRetUINT32
- ._HXAtomicSubRetUINT32:
- lwarx r5,0,r3 # Load r5 w/ *pNum, set reserve flag
- subf r5,r4,r5 # subtract GPR4 from r5
- stwcx. r5,0,r3 # Store r5 in *pNum if flag still set
- bne- ._HXAtomicSubRetUINT32 # retry if store failed
- addi r3,r5,0 # Save return value in r3
- br # return from routine
- #######################################################################