Re: libebl: Add ebl_func_addr_mask plus ARM backend implementation. (Was: [PATCH] libebl: Add ebl_unwind_ret_mask.)

[Mark Wielaard <mjw at redhat dot com>]

On Tue, 2014-06-17 at 22:09 +0200, Mark Wielaard wrote:
>     libebl: Add ebl_func_addr_mask plus ARM backend implementation.
>     
>     The ARM EABI says that the zero bit of function symbol st_value indicates
>     whether the symbol points to a THUMB or ARM function. Also the return
>     value address in an unwind will contain the same extra bit to indicate
>     whether to return to a regular ARM or THUMB function. Add a new ebl
>     function to mask off such bits and turn a function value into a function
>     address so that we get the actual value that a function symbol or return
>     address points to. It isn't easily possible to reuse the existing
>     ebl_resolve_sym_value for this purpose, so we end up with another hook
>     that can be used from dwfl_module_getsym, handle_cfi and elflint.
>     
>     Signed-off-by: Mark Wielaard <mjw@redhat.com>

Pushed after testing against Fedora armv7hl, which doesn't use THUMB by
default and Debian armhf which does use THUMB by default.

Cheers,

Mark