Re: [PATCH v4 02/13] selftests/sgx: Produce static-pie executable for test enclave

[Jo Van Bulck]

On 29.08.23 12:55, Huang, Kai wrote:> Could you please add the linker 
error (as you mentioned in the v3) to the
> changelog to justify this code change?

Makes sense, done.

> And sigh.. I still don't quite understand why linker complains
>
> 	lea	(encl_stack)(%rbx), %rax
>
> because ....
>
> >   	jmp encl_entry_core
> >   encl_dyn_entry:
> >   	# Entry point for dynamically created TCS page expected to follow
>
> we have a
>
> 	lea -1(%rbx), %rax
>
> right here.
>
> Can't the compiler/linker just treat it as an immediate just like -1?  :-(

I think the linker complains because with -static-pie -fPIE afaik all 
local symbols need to have RIP-relative addressing "encl_stack(%rip)".

Best,
Jo