Computer Language : Usage of Syscall

Input / Output : Usage of Syscall

·         Assembly programs request a service by loading the system call (syscall) instruction.

Format  :

·        System services.

Service	System Call Code	Arguments	Result
print_int	1	$a0 = integer
print_float	2	$f12 = float
print_double	3	$f12 = double
print_string	4	$a0 = string
read_int	5		integer (in $v0)
read_float	6		float (in $f0)
read_double	7		double (in $f0)
read_string	8	$a0 = buffer, $a1 = length
sbrk	9	$a0 = amount	address (in $v0)
exit	10
print_character	11	$a0 = character
read_character	12		character (in $v0)
open	13	$a0 = filename,	file descriptor (in $v0)
		$a1 = flags, $a2 = mode
read	14	$a0 = file descriptor,	bytes read (in $v0)
		$a1 = buffer, $a2 = count
write	15	$a0 = file descriptor,	bytes written (in $v0)
		$a1 = buffer, $a2 = count
close	16	$a0 = file descriptor	0 (in $v0)
exit2	17	$a0 = value

Example :

a.) exit

b.) Get a number and store it

c. ) Print result from $t2

By : Wong Poh Ling    B031210033