e91a737310
1.To support the different MCU in series(e.g. cortex-m0+) 2.It's redundant since we already specify in compliler option Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
103 lines
3.4 KiB
ArmAsm
103 lines
3.4 KiB
ArmAsm
/****************************************************************************
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* arch/arm/src/armv8-m/arm_signal_handler.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/syscall.h>
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#if defined(CONFIG_BUILD_PROTECTED) && !defined(__KERNEL__)
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/****************************************************************************
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* File info
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****************************************************************************/
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.syntax unified
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.thumb
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.file "arm_signal_handler.S"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_signal_handler
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*
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* Description:
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* This function is the user-space, signal handler trampoline function. It
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* is called from up_signal_dispatch() in user-mode.
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*
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* R0-R3, R11 - volatile registers need not be preserved.
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* R4-R10 - static registers must be preserved
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* R12-R14 - LR and SP must be preserved
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*
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* Input Parameters:
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* R0 = sighand
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* The address user-space signal handling function
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* R1-R3 = signo, info, and ucontext
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* Standard arguments to be passed to the signal handling function.
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*
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* Returned Value:
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* None. This function does not return in the normal sense. It returns
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* via the SYS_signal_handler_return (see svcall.h)
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*
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****************************************************************************/
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.text
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.thumb_func
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.globl up_signal_handler
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.type up_signal_handler, function
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up_signal_handler:
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/* Save some register */
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push {lr} /* Save LR on the stack */
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/* Call the signal handler */
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mov ip, r0 /* IP=sighand */
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mov r0, r1 /* R0=signo */
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mov r1, r2 /* R1=info */
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mov r2, r3 /* R2=ucontext */
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blx ip /* Call the signal handler */
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/* Restore the registers */
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pop {r2} /* Recover LR in R2 */
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mov lr, r2 /* Restore LR */
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/* Execute the SYS_signal_handler_return SVCall (will not return) */
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mov r0, #SYS_signal_handler_return
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svc #SYS_syscall
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nop
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.size up_signal_handler, .-up_signal_handler
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.end
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#endif /* CONFIG_BUILD_PROTECTED && !__KERNEL__ */
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