思路
通过cargo编译staticlib，再与XWOS进行链接；由于XWOS支持ARM/PowerPC/RISC-V，因此需要通过--target=选项来进行多平台的交叉编译。
方案
XWOS启动一个独立线程，调用RUST的主函数，由此进入RUST的世界；RUST的主函数与中间件是一个独立编译的玄武模块；由于RUST的编译依赖工具cargo，可设计一个新的玄武模块编译规则调用cargo build；RUST玄武模块以staticlib形式进行编译，最终与XWOS进行静态链接；因为会使用一些unstable的特性，所以需安装nightly的RUST。
编译方案
应将cargo build目标设定为PHONY，即可每次make时都调用cargo build， 由cargo来管理rust源码的编译；环境变量$(RUST_TARGET)在cpu.mk中定义；其他编译选项，由.cargo/config或build.rs定义；cargo build编译结束后，再将输出的.a文件拷贝到输出目录；
安装rust环境
根据官方指导安装rust；切换镜像源，编辑~/.cargo/config
[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"
replace-with = 'sjtu'
[source.ustc]
registry = "http://mirrors.ustc.edu.cn/crates.io-index"
[source.sjtu]
registry = "http://mirrors.sjtug.sjtu.edu.cn/git/crates.io-index"
Ubuntu安装unstable版本
rustup install nightly
rustup +nightly target add thumbv8m.main-none-eabihf
rustup +nightly target add thumbv8m.main-none-eabi
rustup +nightly target add thumbv8m.base-none-eabi
rustup +nightly target add thumbv7m-none-eabi
rustup +nightly target add thumbv7em-none-eabihf
rustup +nightly target add thumbv7em-none-eabi
rustup +nightly target add thumbv6m-none-eabi
rustup +nightly target add riscv32imac-unknown-none-elf
rustup +nightly component add rust-src
Windows安装unstable版本
rustup install nightly-x86_64-pc-windows-gnu
rustup +nightly-x86_64-pc-windows-gnu target add thumbv8m.main-none-eabihf
rustup +nightly-x86_64-pc-windows-gnu target add thumbv8m.main-none-eabi
rustup +nightly-x86_64-pc-windows-gnu target add thumbv8m.base-none-eabi
rustup +nightly-x86_64-pc-windows-gnu target add thumbv7m-none-eabi
rustup +nightly-x86_64-pc-windows-gnu target add thumbv7em-none-eabihf
rustup +nightly-x86_64-pc-windows-gnu target add thumbv7em-none-eabi
rustup +nightly-x86_64-pc-windows-gnu target add thumbv6m-none-eabi
rustup +nightly-x86_64-pc-windows-gnu target add riscv32imac-unknown-none-elf
rustup +nightly-x86_64-pc-windows-gnu component add rust-src
RUST中间件模板
目录结构：
XWOS
└── xwmd
└── rust
└── xwos
├── Cargo.lock
├── Cargo.toml
├── .cargo
│ └── config
├── src
│ └── lib.rs
└── xwmo.mk
Cargo.toml
[package]
name = "xwos"
version = "1.0.0"
edition = "2021"
[lib]
name = "xwos"
crate-type = ["staticlib"]
[dependencies]
.cargo/config
[unstable]
build-std = ["core", "alloc", "std", "panic_abort"]
src/lib.rs
#![feature(restricted_std)]
#[no_mangle]
pub unsafe extern "C" fn rust_main() {
}
xwmo.mk
include $(XuanWuOS_WKSPC_DIR)/XuanWuOS.cfg
include $(XWBS_UTIL_MK_XWMO)
include xwbs/xwmo.rust.mk
编译规则xwbs/xwmo.rust.mk
include $(XuanWuOS_ARCH_DIR)/arch.mk
include $(XuanWuOS_CPU_DIR)/cpu.mk
include $(XuanWuOS_SOC_DIR)/soc.mk
include $(XuanWuOS_BRD_DIR)/brd.mk
include $(XuanWuOS_XWOS_DIR)/xwos.mk
include $(XuanWuOS_BRD_DIR)/lib.mk
include $(XWBS_UTIL_MK_XWMO)
include xwbs/$(XuanWuOS_CFG_ARCH).$(XuanWuOS_CFG_COMPILER).rule
XWMO_NAME := $(call getXwmoName)
XWMO_DIR := $(call getXwmoDir)
XWMO_OBJ_DIR ?= $(XWMO_DIR)
XWMO_RUSTLIB_NAME := lib$(notdir $(XWMO_DIR)).a
ifeq ($(XuanWuOS_CFG_HOSTOS),windows-nt)
RUST_TOOLCHAIN := +nightly-x86_64-pc-windows-gnu
else
RUST_TOOLCHAIN := +nightly
endif
ifeq ($(~D),0)
CARGO_BUILD_FLAGS += --release
XWMO_RUSTLIB := $(XWMO_DIR)/target/$(RUST_TARGET)/release/$(XWMO_RUSTLIB_NAME)
else
XWMO_RUSTLIB := $(XWMO_DIR)/target/$(RUST_TARGET)/debug/$(XWMO_RUSTLIB_NAME)
endif
$(XuanWuOS_OBJ_DIR)/$(XWMO_OBJ_DIR)/$(XWMO_NAME): $(XWMO_RUSTLIB) $(XuanWuOS_OBJ_DIR)/$(XWMO_OBJ_DIR)
$(SHOW_CP) $(CP) $< $@
$(XuanWuOS_OBJ_DIR)/$(XWMO_OBJ_DIR):
@[ ! -d $@ ] && mkdir -p $@ || true
$(XWMO_RUSTLIB):
cd $(XWMO_DIR); cargo $(RUST_TOOLCHAIN) build $(CARGO_BUILD_FLAGS) --target=$(RUST_TARGET)
clean:
@$(RM) -f $(XuanWuOS_OBJ_DIR)/$(XWMO_OBJ_DIR)/$(XWMO_NAME)
@cd $(XWMO_DIR); cargo $(RUST_TOOLCHAIN) clean
distclean:
$(RM) -rf $(XuanWuOS_OBJ_DIR)/$(XWMO_OBJ_DIR)
@cd $(XWMO_DIR); cargo $(RUST_TOOLCHAIN) clean
.PHONY: dsm clean distclean $(XWMO_RUSTLIB)
好文阅读
发表评论