mq_timedsend

send a message to a message queue

sys_mq_timedsend(mqd_t mqdes, const char *msg_ptr, size_t msg_len, unsigned int msg_prio, const struct __kernel_timespec *abs_timeout)

register	value
`a7`	182, the syscall number
`a0`	mqd_t mqdes
`a1`	const char *msg_ptr
`a2`	size_t msg_len
`a3`	unsigned int msg_prio
`a4`	const struct __kernel_timespec *abs_timeout
`a0`	the return value

Then run ecall to enter the kernel.

Same syscall on other architectures