ref: e5661f9d9974c84bd3637be74c1247ce8aec638d
dir: /amd64/include/ureg.h/
struct Ureg {
u64int ax;
u64int bx;
u64int cx;
u64int dx;
u64int si;
u64int di;
u64int bp;
u64int r8;
u64int r9;
u64int r10;
u64int r11;
u64int r12;
u64int r13;
u64int r14;
u64int r15;
u16int ds;
u16int es;
u16int fs;
u16int gs;
u64int type;
u64int error; /* error code (or zero) */
u64int pc; /* pc */
u64int cs; /* old context */
u64int flags; /* old flags */
u64int sp; /* sp */
u64int ss; /* old stack segment */
};