.*: Assembler messages: .*:3: Error: unknown pseudo-op: `.code64' .*:4: Error: `movabs' is only supported in 64-bit mode .*:5: Error: `movabs' is only supported in 64-bit mode GAS LISTING .* [ ]*1[ ]+\.include "code64\.s" [ ]*1[ ]+\.text [ ]*2[ ]+_start: [ ]*3[ ]+\.code64 [ ]*4[ ]+movabs 0x87654321, %al [ ]*5[ ]+movabs \$0x87654321, %rax