e7dffdf06f
and change SYS_context_[save|restore] to SYS_[save|restore]_context Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
135 lines
4.6 KiB
C
135 lines
4.6 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/crt0.c
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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 <sys/types.h>
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#include <stdlib.h>
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#include <nuttx/addrenv.h>
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#ifdef CONFIG_BUILD_KERNEL
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int main(int argc, char *argv[]);
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/****************************************************************************
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* Private 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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static void sig_trampoline(void) naked_function;
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static void sig_trampoline(void)
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{
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__asm__ __volatile__
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(
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" push {lr}\n" /* Save LR on the stack */
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" mov ip, r0\n" /* IP=sighand */
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" mov r0, r1\n" /* R0=signo */
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" mov r1, r2\n" /* R1=info */
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" mov r2, r3\n" /* R2=ucontext */
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" blx ip\n" /* Call the signal handler */
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" pop {r2}\n" /* Recover LR in R2 */
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" mov lr, r2\n" /* Restore LR */
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" mov r0, #5\n" /* SYS_signal_handler_return */
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" svc %0\n" /* Return from the SYSCALL */
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::"i"(SYS_syscall)
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);
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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: _start
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*
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* Description:
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* This function is the low level entry point into the main thread of
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* execution of a task. It receives initial control when the task is
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* started and calls main entry point of the newly started task.
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*
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* Input Parameters:
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* argc - The number of parameters being passed.
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* argv - The parameters being passed. These lie in kernel-space memory
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* and will have to be reallocated in user-space memory.
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*
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* Returned Value:
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* This function should not return. It should call the user-mode start-up
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* main() function. If that function returns, this function will call
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* exit.
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*
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****************************************************************************/
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void _start(int argc, FAR char *argv[])
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{
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int ret;
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/* Initialize the reserved area at the beginning of the .bss/.data region
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* that is visible to the RTOS.
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*/
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ARCH_DATA_RESERVE->ar_sigtramp = (addrenv_sigtramp_t)sig_trampoline;
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/* Call C++ constructors */
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/* Setup so that C++ destructors called on task exit */
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/* REVISIT: Missing logic */
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/* Call the main() entry point passing argc and argv. */
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ret = main(argc, argv);
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/* Call exit() if/when the main() returns */
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exit(ret);
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}
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#endif /* CONFIG_BUILD_KERNEL */
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