RISCV toolchain with linux ABI
===

## 前言

描述如何使用 RISC-V toolchain with Linux ABI。涵蓋範圍從安裝到如何執行程式。

## 安裝

這個部份我們都是從原始碼開始建置。

1. 設定`install`路徑

export RISCV=/where/you/want/place/binary

2. Build`RISC-V gnu toolchain`

git clone --recursive https://github.com/riscv/riscv-gnu-toolchain
cd riscv-gnu-toolchain
mkdir build_linux
cd build_linux
../configure --prefix=$RISCV
make linux -j4 && make install

3. Build `RISC-V PK`

git clone https://github.com/riscv/riscv-pk
cd riscv-pk
mkdir build
cd build
../configure PATH=$RISCV/bin:$PATH --host=riscv64-unknown-linux-gnu --prefix=$RISCV
make -j4 && make install

4. Build `RISC-V fesvr`

git clone https://github.com/riscv/riscv-fesvr
cd riscv-fesvr
mkdir build
cd build
../configure --prefix=$RISCV
make -j4 && make install

5. Build `RISC-V Spike`

git clone https://github.com/riscv/riscv-isa-sim 
cd riscv-isa-sim
mkdir build
cd build
../configure --prefix=$RISCV
make -j4
make install

## 使用

> 備註，如果是用60我編的toolchain的話，需要將lib加入進LD_LIBRARY_PATH，因為server的gcc太舊我沒有辦法用它編譯最新的spike

路徑我放在

`/nfs/piyochen/rvv/risc-v/bin`

1. 首先利用`riscv64-unknown-linux-gnu-gcc`編譯程式，並且使用`static linking`

// Save as check.c
// This program will check the glibc version
#include <stdio.h>                                                          
#include <stdlib.h>                                                         
#include <gnu/libc-version.h>                                               
                                                                            
int main(int argc, char *argv[]) {                                          
        printf("GNU libc version: %s\n", gnu_get_libc_version());           
        exit(EXIT_SUCCESS);                                                 
}                                        

$RISCV/bin/riscv64-unknown-linux-gnu-gcc -static check.c

2. 利用 `Spike` 與 `pk` 執行它

$RISCV/bin/spike $RISCV/riscv66-unknown-linux-gnu/bin/pk a.out