Man page 9 : __audit_syscall_entry

__audit_syscall_entry - fill in an audit record at syscall entry

void __audit_syscall_entry(int  arch , int  major , unsigned long  a1 , unsigned long  a2 , unsigned long  a3 , unsigned long  a4 );

arch
    architecture type

major
    major syscall type (function)

a1
    additional syscall register 1

a2
    additional syscall register 2

a3
    additional syscall register 3

a4
    additional syscall register 4

Fill in audit context at syscall entry. This only happens if the audit context was created when the task was created and the state or filters demand the audit context be built. If the state from the per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT, then the record will be written at syscall exit time (otherwise, it will only be written if another part of the kernel requests that it be written).