Re: [WIP/RFC] MIPS registers overhaul

cgd
2003-05-20T21:57:20Z

At Tue, 20 May 2003 16:52:23 -0400, Andrew Cagney wrote:
> > At Sat, 17 May 2003 00:41:10 +0000 (UTC), "Kevin Buettner" wrote:
> >
> >> Unfortunately, it isn't reasonable to use an ABI-specific RDA to debug
> >> an application which uses a different ABI. It might kind of, sort of
> >> work some of the time, but there are various things that won't work.
> >> You've just identified one of the problems.
> >
> >
> > BTW, because of this kind of problem, does it even make sense that
> > when talking to a mips64 kernel but using an o32 rda (or gdbserver
> > 8-), you'd use a "mips64" protocol? I.e., why wouldn't it just use
> > the 32-bit mips protocol, since from you're debugging a 32-bit binary
> > with a 32-bit debugging daemon...
>
> Ignoring the FP registers, I think it does make sense. o32 code does
> run on a 64 bit ISA. Who is GDB to decide what the ISA should be.

I think even w.r.t. FP registers it makes sense. 8-)

in o32, there are exactly (32 * 32 bits) worth of FP registers.

They've got a very strange organization, and different operations on
them set them in non-obvious ways, but they're still 32*32 bits.

cgd