1 == code
 2 
 3 # instruction                     effective address                                                   operand     displacement    immediate
 4 # op          subop               mod             rm32          base        index         scale       r32
 5 # 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
 6 
 7 write_stderr:  # s : (address array byte) -> <void>
 8   # prolog
 9   55/push-EBP
10   89/copy                         3/mod/direct    5/rm32/EBP    .           .             .           4/r32/ESP   .               .                 # copy ESP to EBP
11   # save registers
12   50/push-EAX
13   51/push-ECX
14   52/push-EDX
15   53/push-EBX
16   # write(2/stderr, (data) s+4, (size) *s)
17     # fd = 2 (stderr)
18   bb/copy                         .               .             .           .             .           .           .               2/imm32           # copy to EBX
19     # x = s+4
20   8b/copy                         1/mod/*+disp8   4/rm32/SIB    5/base/EBP  4/index/none  .           1/r32/ECX   8/disp8         .                 # copy *(EBP+8) to ECX
21   81          0/subop/add         3/mod/direct    1/rm32/ECX    .           .             .           .           .               4/imm32           # add to ECX
22     # size = *s
23   8b/copy                         1/mod/*+disp8   4/rm32/SIB    5/base/EBP  4/index/none  .           2/r32/EDX   8/disp8         .                 # copy *(EBP+8) to EDX
24   8b/copy                         0/mod/indirect  2/rm32/EDX    .           .             .           2/r32/EDX   .               .                 # copy *EDX to EDX
25     # call write()
26   b8/copy                         .               .             .           .             .           .           .               4/imm32/write     # copy to EAX
27   cd/syscall  0x80/imm8
28   # restore registers
29   5b/pop-to-EBX
30   5a/pop-to-EDX
31   59/pop-to-ECX
32   58/pop-to-EAX
33   # end
34   89/copy                         3/mod/direct    4/rm32/ESP    .           .             .           5/r32/EBP   .               .                 # copy EBP to ESP
35   5d/pop-to-EBP
36   c3/return
37 
38 # vim:ft=subx:nowrap:tw&