_REG_R0
u->uc_mcontext.__gregs[_REG_R0] = (__greg_t)(uintptr_t)arg;
gr[_REG_R0 + i] = va_arg(ap, int);
uc.uc_mcontext.__gregs[_REG_R0] = val;
gr[_REG_R0] = tf->tf_reg[0];
tf->tf_reg[0] = gr[_REG_R0];
gr[_REG_R0] = tf->tf_r0;
tf->tf_r0 = gr[_REG_R0];
#define _REG_RV _REG_R0
#define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_R0])
gr[_REG_R0] = tf->tf_r0;
tf->tf_r0 = gr[_REG_R0];
#define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_R0])
gr[_REG_R0] = tf->tf_r0;
tf->tf_r0 = gr[_REG_R0];
gr[_REG_R0] = luc->luc_mcontext.arm_r0;
luc->luc_mcontext.arm_r0 = gr[_REG_R0];