_REG_R1
gr[_REG_R1] = (__greg_t)sp;
gr[_REG_R1] = sp;
gr[_REG_R1] = tf->tf_reg[1];
tf->tf_reg[1] = gr[_REG_R1];
gr[_REG_R1] = tf->tf_r1;
tf->tf_r1 = gr[_REG_R1];
#define _REG_SP _REG_R1
#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_R1])
gr[_REG_R1] = tf->tf_r1;
tf->tf_r1 = gr[_REG_R1];
gr[_REG_R1] = tf->tf_r1;
tf->tf_r1 = gr[_REG_R1];
gr[_REG_R1] = luc->luc_mcontext.arm_r1;
luc->luc_mcontext.arm_r1 = gr[_REG_R1];