1 ## first program: same as https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
 2 # Just return 42.
 3 #
 4 # To run:
 5 #   $ subx translate ex1.1.subx ex1
 6 #   $ subx run ex1
 7 # Expected result:
 8 #   $ echo $?
 9 #   42
10 
11 == code
12 # opcode        ModR/M                    SIB                   displacement    immediate
13 # instruction   mod, reg, Reg/Mem bits    scale, index, base
14 # 1-3 bytes     0/1 byte                  0/1 byte              0/1/2/4 bytes   0/1/2/4 bytes
15   bb                                                                            2a 00 00 00       # copy 0x2a (42) to EBX
16   # exit(EBX)
17   b8                                                                            01 00 00 00       # copy 1 to EAX
18   cd                                                                            80                # int 80h
19 
20 # vim:ft=subx