Woolshed

a naive attempt to emulate Classic MacOS runtime

NOTE: This is a hacky experiment and is by no means pretty.

Caveats

• This is an ugly hack that hasn't been completely refactored
• 64MB of RAM is allocated for the process and there's no real memory management
• There's very little sanity checks anywhere so it will cause buffer overflows
• It only runs on Little Endian systems but it should be easy to fix it
• It only builds on 64-bit Linux so far, I guess

Quick Start

Depends on Qt5.

$ make
$ ./woolshed run examples/hello

You can see quite a bit of information about the PEF image with:

$ ./woolshed dump examples/hello

Hacking

Most of the runtime initialization code is in src/run.c and in src/pef.c except the CPU emulation.

System libraries are in lib/ and all library function calls take the CPU state as their sole argument.

Acks

Resources used to write this hack:

• SheepShaver BeOS PPC CPU emulation code
• Mac OS Runtime Architectures (book) for PEF reference
• GNU binutils for PowerPC to disassemble code with objdump
• Macintosh Programmer's Workshop to compile examples
• Original Apple Developer Connection API reference