#source: call1.s #as: --64 #ld: -melf_x86_64 -z call-nop=prefix-addr #objdump: -dw .*: +file format .* Disassembly of section .text: #... [ ]*[a-f0-9]+: 67 e8 ([0-9a-f]{2} ){4} * addr32 callq +[a-f0-9]+ #pass