On Fri, 2025-04-25 at 17:23 +0800, Xu Kuohai wrote: [...]
> For the two questions you mentioned, I’m not sure if we can access DWARF > attributes > at runtime. As for adding parameter locations to BTF at building time, I > think it > means we would need to record CPU-related register info in BTF, which I don’t > think > is a good idea. Another option would be for pahole to check if function parameter DW_AT_locaction is placed in accordance with ABI. These flags can be recorded in a dedicated section or smth like this. Having said that, DW_AT_locaction seem to be not very reliable. E.g. for bpf_testmod.ko generated by clang 19.1.7 I don't see DW_AT_locaction specified for parameters a, b, c.
