[rust-dev] adding a new cross-compile target

Valerii Hiora valerii.hiora at gmail.com
Sun Jul 20 12:59:47 PDT 2014

Hi Rob,

> make: *** No rule to make target 
> `powerpc64-bgq-linux/rt/arch/powerpc64/morestack.o', needed by 
> `powerpc64-bgq-linux/rt/libsmorestack.a'.  Stop.
> I don't know how to go about debugging this.   Any ideas?

  There is no way to "debug" this - you have to implement a couple of
functions which are required by Rust runtime and are
architecture-dependent. They live in src/rt/arch/$ARCH_NAME$

  Functions (files) are:

  morestack (morestack.S) - it is a vestige from segmented stack time.
Back then it allocated a new stack segment once were wasn't enough space
in the current one. Nowadays it just calls rust_stack_exhausted function.

  record_sp_limit (record_sp.S) - should store stack limit for current
task (usually it uses platform specific thread local storage).

  get_sp_limit (record_sp.S) - should return stack limit for current
task (reads from the same platform-specific thread local storage)

  rust_swap_registers (_context.S) - I'm not sure about this one, but I
assume it allows correct register restoration in case of green task

  rust_bootstrap_green_task (_context.S) - again, not sure, but I assume
it initializes green task.

  Note, that all stack-related functions (morestack, record_sp_limit,
get_sp_limit) should be actually compatible with LLVM segmented stack
prologue (in your case consult
$LLVM/lib/target/PowerPC/PPCFrameLowering.cpp, emitPrologue and
emitEpilogue methods, may be a couple of others).

  For a reference implementations (and much more additional comments)
see src/rt/arch/i386/*.S



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