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https://github.com/simias/rustation

Playstation emulator in the Rust programing language
https://github.com/simias/rustation

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Playstation emulator in the Rust programing language

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README 

        
[![Build Status](https://travis-ci.org/simias/rustation.svg)](https://travis-ci.org/simias/rustation)



# This project is no longer being developed.



I decided to restart from scratch to fix some architectural flaws in Rustation.

Some of the code has been imported from this project, other bits have been

thoroughly rewritten. The new repository is

[rustation-ng](https://gitlab.com/flio/rustation-ng/). It's now more advanced

than this project, with proper sound support and generally more accurate

emulation.



One significant difference between the two projects is than rustation-ng dropped

the GL renderer in favor of a threaded software one. The GL renderer of

Rustation has been ported to C++ and has been integrated in the Beetle PSX

emulator however, so it's not completely dead.



# Rustation PlayStation emulator



![Rustation logo](https://raw.githubusercontent.com/wiki/simias/rustation/images/logo.png)



PlayStation emulator in the Rust programing language.



This repository only contains the source code for the core of the

emulator. The OpenGL renderer and the libretro interface is is the

[rustation-libretro](https://github.com/simias/rustation-libretro)

repository.



The focus of this emulator is to write code that's clean, accurate and

hopefully easy to understand. There's no plugin infrastructure, the

emulator is monolithic.



Performance is pretty poor at the moment but it should be enough to

run close to realtime on a modern CPU.



For the time being it can only boot a few games. Crash Bandicoot

(Japanese version) is mostly playable, although I've had random

crashes. Some other games (like Spyro) freeze after or during the

intro.



If you have any questions, in particular if something in the code is

not clear or properly commented don't hesitate to fill an issue.



I also created a [/psx/ board on 8chan](https://8ch.net/psx/) if you

prefer something less formal to discuss this emulator and all things

PlayStation. We'll see if this turns out to be a good idea...



## Currently implemented (even partially)



![Crash Bandicoot (Japan)](https://raw.githubusercontent.com/wiki/simias/rustation/images/crash_bandicoot-level1.png)



* CPU

* Basic GTE support (ported from mednafen PSX)

* Instruction cache

* Interrupts

* Basic GPU (no semi-transparency or mask bit emulation)

* Timers (incomplete)

* DMA

* Debugger

* CDROM controller (missing many commands)

* Gamepad controller (only digital pad for now)



## Todo list



* Many things in the GPU

* MDEC

* SPU

* Memory card

* CPU pipeline emulation

* More accurate timings

* Many, many other things...



## Build



You'll need [Rust and its package manager Cargo](https://www.rust-lang.org/),

[SDL2](https://www.libsdl.org/download-2.0.php) and a PlayStation

BIOS. The emulator is mainly tested with BIOS version `SCPH1001` whose

SHA-1 is `10155d8d6e6e832d6ea66db9bc098321fb5e8ebf`.



You should then be able to build the emulator with:



```

cargo build --release

```



Don't forget the `--release` flag in order to turn optimizations

on. Without them the resulting binary will be absurdly slow.



If the build is succesful you can run the emulator using:



```

cargo run --release /path/to/SCPH1001.BIN

```



For Windows check issue [#12](https://github.com/simias/rustation/issues/12).



Use the `Escape` key to exit the emulator, `Pause/Break` to "break" into the

debugger, the emulator will then listen on TCP port `9001` for a GDB

connection.



## Debugger



In order to debug you'll need a GDB targetting

`mipsel-unknown-elf`. Once the emulator is running press the

`Pause/Break` key to trigger the debugger and then connect GDB to it

using (at the gdb command prompt):



`target remote localhost:9001`



GDB might complain about not finding symbols or the boundaries of the

current function but you can ignore that. From then you should be able

to use the familiar [GDB commands](https://sourceware.org/gdb/onlinedocs/gdb/)

to debug the live emulator.



A few examples:



```

# Dump the CPU registers

info registers

# Disassemble 20 instructions around PC

disassemble $pc-40,+80

# Display word at address 0x1f801814 (GPU status)

x/x 0x1f801814

# Add code breakpoint at address 0x00004588

break *0x00004588

# Add write watchpoint at address 0x1f801070 (IRQ ack)

watch *0x1f801070

# Step over a single instruction

stepi

# Continue until a break/watchpoint is reached (or Pause/Break is pressed)

continue

```



The debugger support is pretty experimental and quircky but it works

for basic debugging needs.



## Guide



I'm also attempting to document the emulator writing process in a

LaTeX document available in the

[psx-guide repository](https://github.com/simias/psx-guide). It's

generally lagging behind the actual code but I'll try to update it as

often as possible.



## Resources



I try to cite all of my sources in the guide above but I'm mainly

using the priceless [No$ PSX

specifications](http://problemkaputt.de/psx-spx.htm) as well as

[mednafen](http://mednafen.fobby.net/)'s source code when I feel like

cheating.



I also run tests on the real hardware and store them in the

[psx-hardware-tests repository](https://github.com/simias/psx-hardware-tests/tree/master/tests).