Re: [RFC] DWARF 2 address size != pointer size

[Daniel Jacobowitz <drow@false.org>]

On Fri, May 12, 2006 at 03:18:51PM -0700, David S. Miller wrote:
> I guess this is a side effect of using the MIPS 32-bit ELF target
> rather than something explicit the MIPS backend of GCC is doing
> to tinker with the DWARF output format?

Probably.

> Actually, there is a Sparc situation which is more like this MIPS
> case.  For -mcpu=v8plus{,a,b} and friends, we're generating 32-bit
> code and using 32-bit SPARC ELF, but certain registers are available
> for full 64-bit integer operations (for "long long").  We don't handle
> this in GDB currently because there is no easy way to get at the full
> 64-bit register values in a 32-bit process with a 32-bit gdb.  With a
> 64-bit GDB we can easily do this, and under Linux/Sparc there are
> special versions of the ptrace commands which allow passing 64-bit
> register values back and forth to/from a 32-bit debugger.
> 
> I've always wanted to add support for that, but it's going to be real
> ugly stuff and take us away from the nice unified Sparc ptrace()
> support which several Sparc targets are sharing right now.

There's already MIPS support for something like this in GDB. 
Additionally, PPC support was posted.  And, someone posted v8plus
support for Solaris (three or four months ago?).  Don't remember what
became of that.

-- 
Daniel Jacobowitz
CodeSourcery