108 lines
2.7 KiB
ArmAsm
108 lines
2.7 KiB
ArmAsm
/****************************************************************************
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* arch/arm/src/armv6-m/arm_saveusercontext.S
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <nuttx/irq.h>
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.file "arm_saveusercontext.S"
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.text
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.syntax unified
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.thumb
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_saveusercontext
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*
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* Description:
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* Save the current context. Full prototype is:
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*
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* int up_saveusercontext(void *saveregs);
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*
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* R0 = saveregs = pinter saved array
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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 up_saveusercontext
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.globl up_saveusercontext
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.type up_saveusercontext, %function
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up_saveusercontext:
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/* Save r0~r3 */
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str r0, [r0, #(4*REG_R0)]
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str r1, [r0, #(4*REG_R1)]
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str r2, [r0, #(4*REG_R2)]
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str r3, [r0, #(4*REG_R3)]
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/* Save r12, r14, pc */
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mov r1, r12
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mov r2, r14
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str r1, [r0, #(4*REG_R12)]
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str r2, [r0, #(4*REG_R14)]
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str r2, [r0, #(4*REG_R15)]
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/* Save xpsr */
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mrs r1, XPSR
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str r1, [r0, #(4*REG_XPSR)]
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/* Save r13, primask, r4~r7 */
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mov r2, sp
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mrs r3, primask
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stmia r0!, {r2-r7}
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/* Save r8~r10 */
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mov r1, r8
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mov r2, r9
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mov r3, r10
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stmia r0!, {r1-r3}
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/* Save r11 and EXC_RETURN */
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mov r1, r11
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/* Save EXC_RETURN to 0xffffffff */
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movs r2, #0
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subs r2, #1
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stmia r0!, {r1-r2}
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movs r0, #0
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bx lr
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.size up_saveusercontext, . - up_saveusercontext
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.end
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