Jordan Niethe's on March 20, 2020 3:17 pm: > Currently unsigned ints are used to represent instructions on powerpc. > This has worked well as instructions have always been 4 byte words. > However, a future ISA version will introduce some changes to > instructions that mean this scheme will no longer work as well. This > change is Prefixed Instructions. A prefixed instruction is made up of a > word prefix followed by a word suffix to make an 8 byte double word > instruction. No matter the endianess of the system the prefix always > comes first. Prefixed instructions are only planned for powerpc64. > > Introduce a ppc_inst type to represent both prefixed and word > instructions on powerpc64 while keeping it possible to exclusively have > word instructions on powerpc32, A latter patch will expand the type to > include prefixed instructions but for now just typedef it to a u32. > > Later patches will introduce helper functions and macros for > manipulating the instructions so that powerpc64 and powerpc32 might > maintain separate type definitions.
ppc_inst_t I would slightly prefer for a typedef like this. Reviewed-by: Nicholas Piggin <npig...@gmail.com> > > Signed-off-by: Jordan Niethe <jniet...@gmail.com>
