linux-gate.so.1

Today I noticed about that strange library "linux-gate.so.1" because when I make:

ldd libpftrace.so.1.0.1

It shows:

linux-gate.so.1 => (0xffffe000)
libc.so.6 => /lib/libc.so.6 (0xb7ed8000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)


I investigate and found that is a dynamically shared object (DSO) for
system call purposes (e.g., to speed up system calls and for signal
trampoline/sigreturn purposes).

More info:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0306.2/0674.html