games/Pong-C - Unnamed repository; edit this file 'description' to name the repository.

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - apps/ex8.subx</title> <meta name="Generator" content="Vim/8.1"> <meta name="plugin-version" content="vim8.1_v1"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> <meta name="colorscheme" content="minimal-light"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/master/apps/ex8.subx'>https://github.com/akkartik/mu/blob/master/apps/ex8.subx</a> <pre id='vimCodeElement'> 1 # Example reading commandline arguments: compute length of first arg. 2 # 3 # To run: 4 # $ ./subx translate init.linux examples/ex8.subx -o examples/ex8 5 # $ ./subx run examples/ex8 abc de fghi 6 # Expected result: 7 # $ echo $? 8 # 3 # length of 'abc' 9 # 10 # At the start of a SubX program: 11 # argc: *esp 12 # argv[0]: *(esp+4) 13 # argv[1]: *(esp+8) 14 # ... 15 # Locals start from esp-4 downwards. 16 17 == code 18 # instruction effective address register displacement immediate 19 # . op subop mod rm32 base index scale r32 20 # . 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 21 22 Entry: 23 # . prologue 24 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 25 # eax = ascii-length(argv[1]) 26 # . . push args 27 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) 28 # . . call 29 e8/call <a href='ex8.subx.html#L37'>ascii-length</a>/disp32 30 # . . discard args 31 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 32 33 # exit(eax) 34 89/copy 3/mod/direct 3/rm32/ebx . . . 0/r32/eax . . # copy eax to ebx 35 e8/call syscall_exit/disp32 36 37 ascii-length: # s : (addr array byte) -> n/eax 38 # edx = s 39 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none . 2/r32/edx 4/disp8 . # copy *(esp+4) to edx 40 # var result/eax = 0 41 b8/copy-to-eax 0/imm32 42 $ascii-length:loop: 43 # var c/ecx = *s 44 8a/copy-byte 0/mod/* 2/rm32/edx . . . 1/r32/CL . . # copy byte at *edx to CL 45 # if (c == '\0') break 46 81 7/subop/compare 3/mod/direct 1/rm32/ecx . . . . . 0/imm32 # compare ecx 47 74/jump-if-= $ascii-length:end/disp8 48 # ++s 49 42/increment-edx 50 # ++result 51 40/increment-eax 52 # loop 53 eb/jump $ascii-length:loop/disp8 54 $ascii-length:end: 55 # return eax 56 c3/return 57 58 == data 59 60 # . . vim:nowrap:textwidth=0 </pre> </body> </html>


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