/boot/retpoline-4.4.0-128-generic is in linux-image-4.4.0-128-generic 4.4.0-128.154~14.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | arch/x86/platform/efi/efi_stub_64.S .text efi_call callq *%rdi
arch/x86/platform/efi/efi_thunk_64.S .text efi64_thunk callq *%rbx
arch/x86/platform/efi/efi_thunk_64.S .text efi_enter32 callq *%rdi
drivers/watchdog/hpwdt.c .text asminline_call callq *%r12
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