ref: 6042bb8adffe111049edfcb8b2eb1ad84814ed69
dir: /os/boot/puma/ureg.h/
typedef struct Ureg {
uint r0;
uint r1;
uint r2;
uint r3;
uint r4;
uint r5;
uint r6;
uint r7;
uint r8;
uint r9;
uint r10;
uint r11;
uint r12;
uint r13;
uint r14;
uint link;
uint type;
uint psr;
// uint sp;
uint pc;
} Ureg;