Re: [rfa:solib] Handle start-address descriptors

[Kevin Buettner <kevinb at redhat dot com>]

On Oct 27,  1:45pm, Andrew Cagney wrote:

> Index: solib-svr4.c
...
> +#include "bfd-target.h"
> +#include "exec.h"

I'm surprised that you needed to include exec.h.  solib-svr4.c already
includes target.h and I would've thought this to be sufficient.  If
exec.h isn't needed, please take it out.  (Don't forget to fix Makefile.in.)

> +/* Given an executable's ABFD and target, compute the entry-point
> +   address.  */
> +
> +static CORE_ADDR
> +exec_entry_point (struct bfd *abfd, struct target_ops *targ)
> +{

Could you add a comment here telling why
gdbarch_convert_from_func_ptr_addr() is needed.  Maybe something like
this?

  /* For most targets, the address returned by bfd_get_start_address()
     is the entry point for the start function.  But, for some targets,
     bfd_get_start_address() returns the address of a function descriptor
     from which the entry point address may be extracted.  This address
     is extracted by gdbarch_convert_from_func_ptr_addr().  The method
     gdbarch_convert_from_func_ptr_addr() is the merely the identify
     function for targets which don't use function descriptors.  */

Hmm, a possible problem...  What happens when the target uses function
descriptors, but not for the exec file's start address?  I'm wondering
(ugh) if a separate gdbarch method is required for obtaining the start
address.

> +  return gdbarch_convert_from_func_ptr_addr (current_gdbarch,
> +					     bfd_get_start_address (abfd),
> +					     targ);
> +}

Kevin