func makeInst(buf []byte) inst.Inst {
ret := uint32(buf[0])
ret |= uint32(buf[1]) << 8
ret |= uint32(buf[2]) << 16
ret |= uint32(buf[3]) << 24
return inst.Inst(ret)
}
// Step executes one instruction.
func (vm *VM) Step() {
vm.sys.Reset()
pc := vm.core.IncPC()
u32 := vm.core.ReadU32(pc)
in := inst.Inst(u32)
if vm.Log != nil {
fmt.Fprintf(vm.Log, "%08x: %08x %v", pc, u32, in)
if in.Op() != inst.OpJ {
rs := in.Rs()
rt := in.Rt()
rsv := vm.core.ReadReg(rs)
rtv := vm.core.ReadReg(rt)
fmt.Fprintf(vm.Log, " ; $%d=%d(%08x) $%d=%d(%08x)",
rs, rsv, rsv, rt, rtv, rtv)
}
fmt.Fprintf(vm.Log, "\n")
// vm.Registers.PrintTo(vm.Log)
}
inst.Exec(vm.core, in)
vm.sys.FlushStdout(vm.Stdout)
}
func setImm(i inst.Inst, im uint16) inst.Inst {
return inst.Inst(uint32(i) | uint32(im))
}