[PATCH] Fix gdb disassemble for power6/power7 instructions

Alan Modra amodra@gmail.com
Tue Nov 13 23:46:00 GMT 2012

On Tue, Nov 13, 2012 at 03:45:40AM -0200, Edjunior Barbosa Machado wrote:
> 	* ppc-dis.c (powerpc_init_dialect): If not defined, set
> 	info->disassembler_options to "any" or, if debugging an E500 binary,
> 	to "e500x2".

I don't like this change as it effectively disables later code that
tries to select a default, in particular breaking vle.  The problem is
that the default code is somewhat lacking to say the least, and broken
in the way PPC_OPCODE_64 is handled.

What I think should happen is that the default handling, ie. the block
that starts with
  if ((dialect & ~(ppc_cpu_t) PPC_OPCODE_64) == 0)
should be deleted and a switch on info->mach setting up dialect added
before we parse disassembler_options.  That way -m32 and -m64 can
override the default as they are supposed to.  See bfd/archures.c for
values of bfd_mach_ppc_*.

Alan Modra
Australia Development Lab, IBM

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