What does each audit record field mean?

Hi, I'm a newbie, I'm sorry for my question if anyone has already asked. I use auditctl -a exit,always -S open -F success=0 to audit all successful open syscalls But in the audit.log file I found the following audit records: type=SYSCALL msg=audit(1201421673.445:1508): arch=40000003 syscall=5 success=no exit=-2 a0=bfec1e40 a1=0 a2=b7ee6548 a3=bfec1e40 items=1 ppid=9571 pid=96 95 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts1 comm="vim" exe="/usr/bin/vim" key=(null) The "success" fields of the record is no, what does it mean? Does it represent the syscall is failed? And what does "exit" field mean? Does it represent the syscall's exit code? I'm also confused with the meaning of the fields of "a0" "a1" "a2" and "a3".