If we change the register use in .dwarf_frame, then we are breaking
compatibility with previously compiled code. This isn't a big deal
under HP-UX (dwarf debugging was totally broken on hppa64 until a
recent assembler fix). However, there is a fair bit of installed
code running linux. Thus, I would say not change the status quo
if the above confusion can be handled. The actual numbers used for
the FP registers are obscure and I doubt many people actually care
what they are. It's only people maintaining the dwarf code that
are likely to get confused. If readelf produced a text rather than
numeric representation, then the problem would largely go away.