arm_asm_emu
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cottsay
Gameboy Emulator in ARM Assembly
arm_asm_emu
A Game Boy emulator written entirely in ARM assemly language.
Why assembly language? Why not.
Cross-assembling
The Makefile is set up for both native building on an ARM platform as well as
cross-compling. Pass your favorite cross-compiling prefix to the make
invocation with something like CROSS=arm-none-eabi-.
The testing harness can also be invoked on a non-arm platform using QEMU.
Specify something like TEST_WRAPPER=qemu-arm during the make test
invocation to use QEMU when running tests.
Testing
A test harness has been created which runs a ROM for a given number of cycles
and checks a CRC32 of the screen contents against a set value. If the value
doesn't match, a capture of the screen is saved as a .bmp file and the
process returns non-zero.
At present, only the Blargg tests are targeted. Here are the current passing tests:
| cpu_instrs | passing |
|---|---|
| special | :heavy_check_mark: |
| interrupts | :heavy_check_mark: |
| op sp,hl | :heavy_check_mark: |
| op r,imm | :heavy_check_mark: |
| op rp | :heavy_check_mark: |
| ld r,r | :heavy_check_mark: |
| jr,jp,call,ret,rst | :heavy_check_mark: |
| misc instrs | :heavy_check_mark: |
| op r,r | :heavy_check_mark: |
| bit ops | :heavy_check_mark: |
| op a,(hl) | :heavy_check_mark: |
| timing | passing |
|---|---|
| instr_timing | :heavy_check_mark: |
| mem_timing | :heavy_check_mark: |
| mem_timing-2 | :heavy_check_mark: |
| misc | passing |
|---|---|
| oam_bug causes | :heavy_check_mark: |
| oam_bug non_causes | :heavy_check_mark: |
| oam_bug timing_bug | :heavy_check_mark: |
Interface
Supported graphics interfaces
- Null
- Linux framebuffer
- Bitmap (capture)
Supported control interfaces
- Null
- Linux evdev
Sound
(not implemented)
License
All code is published under the BSD-3-Clause License. See LICENSE for more information.
cottsay