pussuw commented on code in PR #6069: URL: https://github.com/apache/incubator-nuttx/pull/6069#discussion_r850428821
########## arch/risc-v/src/common/crt0.c: ########## @@ -0,0 +1,137 @@ +/**************************************************************************** + * arch/risc-v/src/common/crt0.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <arch/syscall.h> + +#include <nuttx/addrenv.h> +#include <nuttx/compiler.h> +#include <nuttx/config.h> + +#include <sys/types.h> +#include <stdlib.h> + +#ifdef CONFIG_BUILD_KERNEL + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +int main(int argc, char *argv[]); + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: up_signal_handler + * + * Description: + * This function is the user-space, signal handler trampoline function. It + * is called from up_signal_dispatch() in user-mode. + * + * Input Parameters: + * a0 = sighand + * The address user-space signal handling function + * a1-a3 = signo, info, and ucontext + * Standard arguments to be passed to the signal handling function. + * + * Returned Value: + * None. This function does not return in the normal sense. It returns + * via the SYS_signal_handler_return (see syscall.h) + * + ****************************************************************************/ + +static void sig_trampoline(void) naked_function; +static void sig_trampoline(void) +{ + __asm__ __volatile__ + ( + " addi sp, sp, -16\n" /* Save ra on the stack */ + " sd ra, 8(sp)\n" + " mv t0, a0\n" /* t0=sighand */ + " mv a0, a1\n" /* a0=signo */ + " mv a1, a2\n" /* a1=info */ + " mv a2, a3\n" /* a2=ucontext */ + " jalr t0\n" /* Call the signal handler (modifies ra) */ + " ld ra, 8(sp)\n" /* Recover ra in sp */ + " addi sp, sp, 16\n" + " li a0, %0\n" /* SYS_signal_handler_return */ + " ecall\n" /* Return from the SYSCALL */ + " nop\n" + : + : "i" (SYS_signal_handler_return) + : + ); +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: _start + * + * Description: + * This function is the low level entry point into the main thread of + * execution of a task. It receives initial control when the task is + * started and calls main entry point of the newly started task. + * + * Input Parameters: + * argc - The number of parameters being passed. + * argv - The parameters being passed. These lie in kernel-space memory + * and will have to be reallocated in user-space memory. + * + * Returned Value: + * This function should not return. It should call the user-mode start-up + * main() function. If that function returns, this function will call + * exit. + * + ****************************************************************************/ + +void _start(int argc, FAR char *argv[]) Review Comment: Yes I think the FAR qualifier can be removed for this -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
