[PATCH v3] RISC-V: Fix IFUNC resolver cannot access gp pointer

[Yangyu Chen]

On 1/8/25 15:24, Florian Weimer wrote:
> * Yangyu Chen:
> 
>> Can we move the IFUNC invocation function to somewhere after the
>> relocation?
> 
> IFUNC invocation is needed as part of relocation.  It's possible to
> delay IFUNC and copy relocations and apply them in a final relocation
> pass, but I'm not sure if it's worth the complexity in the glibc dynamic
> linker.
> 
> But the gp issue is different: In the original design, the gp pointer is
> initialized by application code, and that definitely runs after
> relocation.  Hence the DT_RISCV_GP_VALUE idea.
> 

But here I have a question: Why is looking up global_pointer in .dynsym, 
which is literally a SHN_ABS typed value (but we should add l_addr to it 
before use), not safe during relocation? IIRC, it does not require 
dynamic symbol resolution. Am I missing something?

Thanks,
Yangyu Chen

> Thanks,
> Florian