xiaoxiang781216 commented on a change in pull request #5782: URL: https://github.com/apache/incubator-nuttx/pull/5782#discussion_r837783079
########## File path: arch/risc-v/src/common/supervisor/riscv_context.S ########## @@ -0,0 +1,234 @@ +/**************************************************************************** + * arch/risc-v/src/common/supervisor/riscv_context.S + * + * 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. + * + ****************************************************************************/ + +.file "riscv_context.S" + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <arch/mode.h> + +#include "riscv_exception_macros.S" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Symbols + ****************************************************************************/ + + .globl riscv_saveusercontext + .globl riscv_fullcontextrestore + .globl riscv_switchcontext + .globl riscv_syscall_return + +/**************************************************************************** + * Name: riscv_saveusercontext + * + * Description: + * Save user context, partially destroys the caller's context + * + * C Function Prototype: + * int riscv_saveusercontext(uintptr_t *saveregs); + * + * Input Parameters: + * saveregs - Context to save + * + * Returned Value: + * 0 on context switch + * 1 on no context switch + * + * Assumptions: + * Global interrupts disabled by the caller. + * + ****************************************************************************/ + +.type riscv_saveusercontext, function + +riscv_saveusercontext: Review comment: can we reuse the syscall implementation like this in supervisor mode: riscv_saveusercontext->sys_call1->riscv_syscall_dispatch->riscv_handle_syscall. So the machine and supervisor mode can share all most code base. -- 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]
