RISCV学习1 RISCV模拟器

最近有个项目需要用到RISCV开发板，没拿到开发板之前，先尝试配置一个虚拟机环境
1、配置riscv-toolchain

git clone https://github.com/riscv/riscv-gnu-toolchain 
Cloning into 'riscv-gnu-toolchain'...
remote: Enumerating objects: 8045, done.
remote: Counting objects: 100% (504/504), done.
remote: Compressing objects: 100% (377/377), done.
remote: Total 8045 (delta 137), reused 448 (delta 124), pack-reused 7541
Receiving objects: 100% (8045/8045), 5.56 MiB | 55.00 KiB/s, done.
Resolving deltas: 100% (3859/3859), done.

2、保依赖库都已经安装

sudo apt-get install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev

3、进入riscv-gnu-toolchain目录，编译（需要2个多小时)

./configure --prefix=/opt/riscv --enable-multilib
./make
./make linux

如果后续步骤有问题，分别编译下面
riscv64-unknown-elf-gcc

./configure --prefix=/opt/riscv
make

riscv64-unknown-linux-gnu-gcc

./configure --prefix=/opt/riscv --enable-multilib
make linux

5、下载riscv-tools

git clone https://github.com/riscv-software-src/riscv-tools
cd ./riscv-tools

6、安装依赖包

sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev libusb-1.0-0-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev device-tree-compiler pkg-config libexpat-dev

7、运行

git submodule update --init --recursive
export RISCV=/opt/riscv
./build.sh

5分钟左右，安装成功提示
RISC-V Toolchain installation completed!

8、创建一个代码hello.c

#include <stdio.h>
int main(){
    printf("hello world!\n");
    return 0;
}

9、编译

/opt/riscv/bin/riscv64-unknown-elf-gcc -o hello hello.c

10、执行
/opt/riscv/bin/spike pk ./hello

增加-m128参数，执行成功
/opt/riscv/bin/spike -m128 pk ./hello

参考：
https://blog.csdn.net/popebl/article/details/123829110
https://blog.csdn.net/nijino/article/details/119273504