2018-02-04 19:22:03 +01:00
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/****************************************************************************
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2018-02-04 19:36:51 +01:00
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* arch/arm/src/armv7-r/up_fetchadd.S
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2018-02-04 19:22:03 +01:00
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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2018-02-04 19:36:51 +01:00
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.file "arm_fetchadd.S"
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2018-02-04 19:22:03 +01:00
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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.text
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/****************************************************************************
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* Name: up_fetchadd32
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*
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* Description:
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* Perform an atomic fetch add operation on the provided 32-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 32-bit value to be incremented.
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* value - The 32-bit addend
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*
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* Returned Value:
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* The incremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchadd32
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.type up_fetchadd32, %function
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up_fetchadd32:
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1:
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ldrex r2, [r0] /* Fetch the value to be incremented */
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add r2, r2, r1 /* Add the addend */
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strex r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strex failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the incremented value */
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bx lr /* Successful! */
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.size up_fetchadd32, . - up_fetchadd32
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/****************************************************************************
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* Name: up_fetchsub32
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*
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* Description:
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* Perform an atomic fetch subtract operation on the provided 32-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 32-bit value to be decremented.
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* value - The 32-bit subtrahend
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*
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* Returned Value:
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* The decremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchsub32
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.type up_fetchsub32, %function
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up_fetchsub32:
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1:
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ldrex r2, [r0] /* Fetch the value to be decremented */
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sub r2, r2, r1 /* Subtract the subtrahend */
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strex r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strex failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the decremented value */
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bx lr /* Successful! */
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.size up_fetchsub32, . - up_fetchsub32
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/****************************************************************************
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* Name: up_fetchadd16
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*
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* Description:
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* Perform an atomic fetch add operation on the provided 16-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 16-bit value to be incremented.
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* value - The 16-bit addend
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*
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* Returned Value:
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* The incremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchadd16
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.type up_fetchadd16, %function
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up_fetchadd16:
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1:
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ldrexh r2, [r0] /* Fetch the value to be incremented */
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add r2, r2, r1 /* Add the addend */
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strexh r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strexh failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the incremented value */
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bx lr /* Successful! */
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.size up_fetchadd16, . - up_fetchadd16
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/****************************************************************************
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* Name: up_fetchsub16
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*
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* Description:
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* Perform an atomic fetch subtract operation on the provided 16-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 16-bit value to be decremented.
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* value - The 16-bit subtrahend
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*
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* Returned Value:
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* The decremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchsub16
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.type up_fetchsub16, %function
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up_fetchsub16:
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1:
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ldrexh r2, [r0] /* Fetch the value to be decremented */
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sub r2, r2, r1 /* Subtract the subtrahend */
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/* Attempt to save the decremented value */
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strexh r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strexh failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the decremented value */
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bx lr /* Successful! */
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.size up_fetchsub16, . - up_fetchsub16
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/****************************************************************************
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* Name: up_fetchadd8
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*
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* Description:
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* Perform an atomic fetch add operation on the provided 8-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 8-bit value to be incremented.
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* value - The 8-bit addend
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*
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* Returned Value:
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* The incremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchadd8
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.type up_fetchadd8, %function
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up_fetchadd8:
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1:
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ldrexb r2, [r0] /* Fetch the value to be incremented */
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add r2, r2, r1 /* Add the addend */
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strexb r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strexb failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the incremented value */
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bx lr /* Successful! */
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.size up_fetchadd8, . - up_fetchadd8
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/****************************************************************************
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* Name: up_fetchsub8
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*
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* Description:
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* Perform an atomic fetch subtract operation on the provided 8-bit value.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* addr - The address of 8-bit value to be decremented.
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* value - The 8-bit subtrahend
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*
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* Returned Value:
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* The decremented value (volatile!)
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*
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****************************************************************************/
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.globl up_fetchsub8
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.type up_fetchsub8, %function
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up_fetchsub8:
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1:
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ldrexb r2, [r0] /* Fetch the value to be decremented */
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sub r2, r2, r1 /* Subtract the subtrahend */
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strexb r3, r2, [r0] /* Attempt to save the result */
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teq r3, #0 /* r2 will be 1 is strexb failed */
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bne 1b /* Failed to lock... try again */
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mov r0, r2 /* Return the decremented value */
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bx lr /* Successful! */
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.size up_fetchsub8, . - up_fetchsub8
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.end
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