1 ## add 1 and 1, and return the result in the exit code
 2 #
 3 # To run:
 4 #   $ subx translate ex2.subx ex2
 5 #   $ subx run ex2
 6 # Expected result:
 7 #   $ echo $?
 8 #   2
 9 
10 == 0x08048054  # code segment, after leaving room for ELF header
11 # instruction                     effective address                                                   operand     displacement    immediate
12 # op          subop               mod             rm32          base        index         scale       r32
13 # 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
14   bb/copy                                                                                                                         1/imm32           # copy 1 to EBX
15   81          0/subop/add         3/mod/direct    3/rm32/ebx                                                                      1/imm32           # add 1 to EBX
16   # exit(EBX)
17   b8/copy                                                                                                                         1/imm32           # copy 1 to EAX
18   cd/syscall                                                                                                                      0x80/imm8         # int 80h
19 
20 # vim:ft=subx