VCPU_REGS_R8
gprs[VCPU_REGS_R8] = vcpu->vc_gueststate.vg_r8;
gprs[VCPU_REGS_R8] = vcpu->vc_gueststate.vg_r8;
vcpu->vc_gueststate.vg_r8 = gprs[VCPU_REGS_R8];
vcpu->vc_gueststate.vg_r8 = gprs[VCPU_REGS_R8];
vmsa->v_r8 = gprs[VCPU_REGS_R8];
case VCPU_REGS_R8: return " R8";