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Instruction set simulator for RISC-V

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Swimmer-RISCV
=============

Instruction set simulator for RISC-V

## Description

Swimmer-RISCV is configurable instruction set simulator written in C++.

## Demo

## VS.

riscv-isa-sim(Spike) is very fast and simple RISC-V simulator written in C++.

Swimmer-RISCV is designed for debugging RISC-V program, using `--trace-hier` option can generate function call tree.
`--debug` option can generate all information such as register read/write and memory access.

## Requirement

### Linux

Swimmer-RISCV is tested on Ubuntu 18.04 LTS and CentOS 7.2 with GCC 8.1.0
For Ubuntu, following packages are need to be install:

```sh
sudo apt install -y libbfd-dev device-tree-compiler python3-dev libpython3-dev pkg-config
```

### RISC-V Tools

riscv-tests repository is used to run regression test using Swimmer-RISCV.
It is recommended to install riscv-tools and $RISCV environment variable should be set.

## Usage

```
usage: ./swimmer_riscv [options] ...
options:
      --max_size          Max size of log file [MB] (unsigned int [=0])
      --max               Max instructions to simulate (unsigned long [=0])
      --binfile           Binary file to simulate. (string [=])
      --hexfile           Hex file to simulate. (string [=])
      --only_info_load    Debug Info is only loaded (only enable with --binfile)
      --debug             Generate debug log
      --out               Output log filename (string [=])
      --load-dump         Dump Loaded Bin file (only enable with --binfile)
      --parallel          CPU Parallel Execution
      --init_pc           Initial Program Counter Value (string [=])
      --stop-host         Stop simulation by accessing MTOHOST
      --use-pk            Location of RISC-V Proxy Kernel (string [=])
      --arch              Support RISC-V Architecture (ex. --arch rv32imafd.../rv64imafd...) (string [=rv64imafdc])
      --trace-hier        Generate Hierarcical Trace
      --trace-out         Hierarcical Trace Output Filename (string [=])
      --vmlinux           Location of vmlinux (string [=])
      --logstart          cycle of log start (unsigned long [=0])
      --printstep         print number of steps each cycle (unsigned long [=0])
      --signature         Generate Signature and filename  (string [=])
  -v, --version           Show Version Information
  -?, --help              print this message
```

- `--max_size` : Max size of simulation log file generated with `--out` option.
- `--max` : Max number of instruction to be simulated.
- `--binfile` : RISC-V binary file to be simulated.
- `--hexfile` : RISC-V srec file to be simulated.
- `--only_info_load` : only load RISC-V binary BFD information. Simulation doesn't start.
- `--debug` : Generate debug information.
- `--out` : Filename of debug information.
- `--load-dump` : Show load binary dump
- `--init_pc` : Specify intial program counter address. If not specify, Swimmer autamatically sets PC by reading RISC-V binary.
- `--stop-host` : Simulator stops when accessing tohost/fromhost memory address.
- `--use-pk` : Specify location of Proxy Kernel.
- `--bit-mode` : Bit mode. 32 or 64.
- `--trace-hier` : Generate Function call hierarchy.
- `--trace-out` : Filename of Functional call hierarchy.
- `--vmlinux` : Specify location of vmlinux object. It is for simulate RISC-V Linux.
- `--logstart` : Number of instructions that starts to generate simulation log.
- `--printstep` : Swimmer generates Step information for each step.
- `--signature` : Swimmer generates signature for riscv-torture.

### Run single elf program

```sh
$ cat test.c
#include <stdio.h>
main () { printf("Hello\n"); }

$ riscv64-unknown-elf-gcc test.c -o test.elf
$ swimmer_riscv --binfile test.elf --use-pk ${RISCV}/riscv64-unknown-elf/bin/pk
Hello
```

### Run Linux

Now Swimmer-RISCV supports Linux binary generated by Freedom-U-SDK.

```sh
$ swimmer_riscv --binfile freedom-u-sdk/work/riscv-pk/bbl
```

## Install

For Release Build:

```sh
cd build
cmake . -DCMAKE_BUILD_TYPE=Release
make
```

## Support Status

10 / 402 patterns in riscv-tests are failed now.

| Pattern Name        | Status |
|---------------------|--------|
| rv32mi-p-mcsr       | Fail   |
| rv32uc-v-rvc        | Fail   |
| rv32mi-p-illegal    | Fail   |
| rv32mi-p-breakpoint | Fail   |
| rv32mi-p-ma_fetch   | Fail   |
| rv64uc-v-rvc        | Fail   |
| rv64mi-p-breakpoint | Fail   |
| rv64mi-p-access     | Fail   |
| rv64mi-p-illegal    | Fail   |
| rv64mi-p-ma_fetch   | Fail   |

## Contribution

## Author

[msyksphinz](https://github.com/msyksphinz)

Email : msyksphinz.dev@gmail.com

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