92 lines
3.0 KiB
ArmAsm
92 lines
3.0 KiB
ArmAsm
/****************************************************************************
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* arch/arm/src/armv7-a/arm_savefpu.S
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <arch/irq.h>
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#ifdef CONFIG_ARCH_FPU
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.file "arm_savefpu.S"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Symbols
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****************************************************************************/
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.globl arm_savefpu
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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: arm_savefpu
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*
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* Description:
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* Given the pointer to a register save area (in R0), save the state of the
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* floating point registers.
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*
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* C Function Prototype:
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* void arm_savefpu(uint32_t *regs);
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*
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* Input Parameters:
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* regs - A pointer to the register save area in which to save the floating point
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* registers
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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.globl arm_savefpu
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.type arm_savefpu, function
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arm_savefpu:
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add r1, r0, #(4*REG_S0) /* R1=Address of FP register storage */
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/* Store all floating point registers. Registers are stored in numeric order,
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* s0, s1, ... in increasing address order.
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*/
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vstmia r1!, {s0-s31} /* Save the full FP context */
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/* Store the floating point control and status register. At the end of the
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* vstmia, r1 will point to the FPCSR storage location.
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*/
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vmrs r2, fpscr /* Fetch the FPCSR */
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str r2, [r1], #4 /* Save the floating point control and status register */
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bx lr
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.size arm_savefpu, .-arm_savefpu
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#endif /* CONFIG_ARCH_FPU */
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.end
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