`sc_fpstate` member of `struct sigcontext` is a `struct fxsave64 *`. use *anyopaque to represent it. avoid to defining `fxsave64` as it is a packed struct with some arrays.
`sc_fpstate` member of `struct sigcontext` is a `struct fxsave64 *`. use *anyopaque to represent it. avoid to defining `fxsave64` as it is a packed struct with some arrays.