sources of linux 'system call'

Hi.
I'm looking for sources of system calls. 
I mean ...  what program is exeecute after I call 'int
$0x80' :), for example

	movq $125,%rax  # call sys_mprotect
	movq $smc_address,%rbx
	movq $0x1000,%rcx
	movq $7,%rdx
	int $0x80

        ?????????????????
        ?????????????????

i want to ask if enybody knows where can i find it
(they should be somewhere in kernale source, but i
couldn't find it)

Regards
Lukas




       
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