VCPU_REGS_R13
gprs[VCPU_REGS_R13] = vcpu->vc_gueststate.vg_r13;
gprs[VCPU_REGS_R13] = vcpu->vc_gueststate.vg_r13;
vcpu->vc_gueststate.vg_r13 = gprs[VCPU_REGS_R13];
vcpu->vc_gueststate.vg_r13 = gprs[VCPU_REGS_R13];
vmsa->v_r13 = gprs[VCPU_REGS_R13];
case VCPU_REGS_R13: return "R13";