doc: sframe: Clarify FDE/FRE function/range start address fields

The function start address in a SFrame FDE (sfde_func_start_address)
is encoded as a signed offset to the function start address from the
SFrame section.

The PC range start address in a SFrame FRE (sfre_start_address) is
encoded as an unsigned offset to the range from the function start
address.

Signed-off-by: Jens Remus <jremus@linux.ibm.com>
1 file changed