Re: [RFC PATCH 6/7] x86/kexec: Debugging support: Dump registers on exception

[H. Peter Anvin]

On 11/5/24 14:27, H. Peter Anvin wrote:
> I don't know if it is necessary, but you can do something like this to 
> make absolutely sure you don't end up with non-relative symbol references:
>
> static inline __constfunc void * sym_addr(const void *sym)
> {
>      void *addr;
>      asm("lea %c1(%%rip),%0" : "=r" (addr) : "i" (sym));
>      return addr;
> }

Compiling with "-fpic -fvisibility=hidden -mcmodel=medium" can also be 
used to suppress non-relative references. If you have external symbol 
references they at least *should* be emitted as GOTPCRELX relocations 
which the linker should relax to relative references; however, I would 
think that you really don't want any of those :)

	-hpa