Re: path for gdb/dwarf2read.c, support 16-bit targets in dwarf-2

[Andrew Cagney <ac131313 at cygnus dot com>]

Jim Blandy wrote:

> >       o       it gives the user a better experience:
> >                       (gdb) x/i 0x800000200
> >                       0x800000200 <start>: ldi $1, 0
> >                       (gdb) print &start
> >                       $1 = 0x800000200
> >               vs
> >                       x/i 0xffffffff800000200
> >                       0xffffffff800000200 <start>: ldi $1, 0
> >                       (gdb) print &start
> >                       $2 = 0xffffffff800000200
> >               at the cost of carrying around wrong
> >               information and complicating the target.
> 
> But which is the correct address --- 0x0000000080000200, or
>                                      0xffffffff80000200?

That is target dependant but well defined.

The MIPS ISA/ABI is carefully defined so MIPS2 on MIPS3 et.al. ensures
that the upper 32 bits is signextended from the low 32 bits.

	Andrew