This is a patched version of the SameBoy Game Boy emulator that can emit traces in the bap-frames format, primarily to be used in combination with rz-tracetest for testing gb (sm83) lifting.

• Because there is no trivial way to determine which registers are read or written during the execution of an instruction, the pre-operands always contain all registers and post-operands contain only the registers that have changed. The register information is thus not sufficient for comparing exact events, but only for pre/post contents.

First, make sure the bap-frames submodule is up to date:

git submodule update --init

Then:

make sdl # or make cocoa for the macOS Cocoa version

Start sameboy from build/bin/SDL/sameboy (or build/bin/SameBoy.app for Cocoa), then to start tracing enter the debugger and type e.g.:

bapo mytrace.frames

After continuing execution, every instruction will be recorded to the file. Later, to close the trace from the debugger, use:

bapc