Turning the microcodes of dynamips into compilable sources.
Related issue: GNS3/dynamips#7
I'm gonna start with ppc32_microcode since 32-bit PowerPC assembly is easier
than 64-bit MIPS assembly.
Flávio J. Saraiva
dynamips can be found at:
- https://github.com/GNS3/dynamips (source repository)
- http://sourceforge.net/projects/gns-3/files/Dynamips/ (releases)
- Debian/Ubuntu packages
The emulated hardware has missing features in many places. It's able to load the IOS images because of the microcode, which is a replacement for the original ROMMON.
I haven't tried it (can't find one) but it's unlikely that a real ROMMON image would work, due to the missing hardware features.
The microcode has enough features to run the IOS images but don't expect any of the other ROMMON features. There is some work done for restart but it appears to be incomplete.
It is unlikely to work in other emulators since it relies on the incompleteness
of the emulated hardware and on the custom remote control device found in
dev_remote.c.
I use two cross-compilers created with crosstools-ng 1.19.0:
- powerpc-unknown-elf for
ppc32_microcode - mips64-unknown-elf for
mips64_microcode
Each toolchain will be inside a subdirectory of ~/x-tools. They are used to decompile the original binary files and to compile the disassembled microcode for testing and comparison purposes.
At a later date I'll try to use existing cross-compilers to compile the resulting source. (no idea what to use or how to use them)
ct-ng mips-unknown-elf
ct-ng menuconfig
> Target options > Target Architecture (powerpc)
ct-ng build
ct-ng mips-unknown-elf
ct-ng menuconfig
> Paths and misc options > [*] Try features marked as EXPERIMENTAL
> Target options > Bitness (64-bit)
> Target options > ABI (n64)
ct-ng build