#objdump: -drw #name: x86-64 opcodes with invalid modrm byte .*: +file format .* Disassembly of section \.text: 0+ <\.text>: [ ]*[a-f0-9]+:[ ]*ff[ ]*\(bad\) [ ]*[a-f0-9]+:[ ]*ef[ ]*out %eax,\(%dx\) [ ]*[a-f0-9]+:[ ]*ff[ ]*\(bad\) [ ]*[a-f0-9]+:[ ]*d8[ ]*\.byte 0xd8 #pass