/usr/lib/linux/3.13.0-166-generic/retpoline is in linux-buildinfo-3.13.0-166-generic 3.13.0-166.216.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # retpoline v1.0
arch/x86/platform/efi/efi_stub_64.S .text efi_call callq *%rdi
arch/x86/platform/efi/efi_stub_64.S .text efi_enter32 callq *%rdi
arch/x86/platform/efi/efi_thunk_64.S .text efi64_thunk callq *%rbx
drivers/watchdog/hpwdt.c .text asminline_call callq *%r12
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