Re: [PATCH] Add sparc64-linux sigtramp support

["David S. Miller" <davem@davemloft.net>]

Mark do you actually have a sparc-linux machine that you test
your changes on?  Your solaris2 tdep removal breaks even
the most simplest debugging test case, there is no way you
tested sparc64-linux debugging.

You're not calling sparc64_init_abi() anymore.  Once you
remove the call to sparc64_sol2_init_abi() it's not occuring
at all.

If you don't have a sparc*-linux machine to test your changes
on, please at least run them by me quickly so I can run the
testsuite on both 32-bit and 64-bit native Linux/Sparc.

BTW, the plt entry size stuff is wrong.  It was wrong for
the solaris2 sparc64 target and it's wrong for the Linux
target as well.  They are variable in size, the first 64K
of them are 16 bytes in size, then they become variable
length sections of split instructions+data.

I think we should instead either teach gdb how to really get
the correct frame even in the funny PLT entry save/restore
sequence (I had this working flawlessly a few years ago, I
could resurrect that code) or we could do something similar to
what the ppc-linux-tdep.c code does.  I also think we should
integrate the "PLT breakpoint avoidance" stuff they do there
as well (and move that into a common file as the comment
above it suggests).

Thanks.