mq_timedsend

send a message to a message queue

sys_mq_timedsend_time32(mqd_t mqdes, const char *u_msg_ptr, unsigned int msg_len, unsigned int msg_prio, const struct old_timespec32 *u_abs_timeout)

register	value
`r20`	231, the syscall number
`r26`	mqd_t mqdes
`r25`	const char *u_msg_ptr
`r24`	unsigned int msg_len
`r23`	unsigned int msg_prio
`r22`	const struct old_timespec32 *u_abs_timeout
`r28`	the return value

Then run ble 0x100(%sr2, %r0) to enter the kernel.

Same syscall on other architectures