Aarch64 to Risc-V64 translation

[egdeeno]

Hello!
Could you, please, answer, is it possible to add Aarch64(guest) to Riscv64(host) translation in instrew?
If so, could you, please, describe steps and changes needed to implement such translation?

[aengelke]

RISC-V hosts are currently not supported, I don't have access to RISC-V hardware with reasonable performance.

Bringing RISC-V support up should be fairly easy.

• client/main.c: set new tsc_host_arch
• client/memory.c: implement ICache flushing in mem_write_code, this is a syscall on Linux (do not use fence.i, this is insufficient)
• client/rtld.c: implement PLT/relocations. Basically similar to AArch64, look for the ifdefs
• client/emulate.c: maybe something needs to be done for clone and other syscalls, I'm not sure.
• server/codegenerator.cc: set triple for RISC-V

For performance, you also want to look at calling conventions, where things typically get a bit messy.

[egdeeno]

Thank you!
Should client/minilibc.c be modified?

[aengelke]

Yeah, forgot about that. You need to implement _start, __clone, syscall wrappers, and dynamic relocations. Should not be substantially different from AArch64, though.

[egdeeno]

Thank you!