ref: aa4cf3a4b23b4a06b2c67c18957f0574aa37df8b
dir: /Inferno/amd64/include/ureg.h/
struct Ureg {
u64 ax;
u64 bx;
u64 cx;
u64 dx;
u64 si;
u64 di;
u64 bp;
u64 r8;
u64 r9;
u64 r10;
u64 r11;
u64 r12;
u64 r13;
u64 r14;
u64 r15;
u16 ds;
u16 es;
u16 fs;
u16 gs;
u64 trap; /* trap type */
u64 ecode; /* error code (or zero) */
u64 pc; /* pc */
u64 cs; /* old context */
u64 flags; /* old flags */
union { /* sp */
u64 usp;
u64 sp;
};
u64 ss; /* old stack segment */
};