/usr/share/doc/nasm/examples/nop.asm is in nasm 2.11.08-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ;Testname=unoptimized; Arguments=-fbin -onop.bin; Files=stdout stderr nop.bin
;Testname=optimized; Arguments=-fbin -onop.bin -Ox; Files=stdout stderr nop.bin
bits 64
nop
o64 nop
pause
o64 pause
xchg ax,ax
xchg eax,eax
xchg rax,rax
rep xchg ax,ax
rep xchg eax,eax
rep xchg rax,rax
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