snapshot of project "lynx", label v2-7-1ac_0-69 - lynx-snapshots - Unnamed repository; edit this file 'description' to name the repository.

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author	Thomas E. Dickey <dickey@invisible-island.net>	1997-09-19 01:14:00 -0400
committer	Thomas E. Dickey <dickey@invisible-island.net>	1997-09-19 01:14:00 -0400
commit	443226a5ffcf805f6ab3ccbcc2a6b4802793b07d (patch)
tree	b6f0dca30c155e9ea2fa8ec78271fb44744b05ce /samples
parent	d2e46bbfcbedb43938b866f4ad9e8bf1d4084b7c (diff)
download	lynx-snapshots-443226a5ffcf805f6ab3ccbcc2a6b4802793b07d.tar.gz

snapshot of project "lynx", label v2-7-1ac_0-69

Diffstat (limited to 'samples')

-rw-r--r--

samples/lynx.cfg

1 files changed, 2 insertions, 2 deletions

<!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 - subx/examples/ex9.subx</title> <meta name="Generator" content="Vim/8.0"> <meta name="plugin-version" content="vim7.4_v2"> <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/subx/examples/ex9.subx'>https://github.com/akkartik/mu/blob/master/subx/examples/ex9.subx</a> <pre id='vimCodeElement'> 1 # Example showing arg order on the stack. 2 # 3 # Show difference between ascii codes of first letter of first arg and first 4 # letter of second arg. 5 # 6 # To run (from the subx directory): 7 # $ ./subx translate examples/ex9.subx -o examples/ex9 8 # $ ./subx run examples/ex9 z x 9 # Expected result: 10 # $ echo $? 11 # 2 12 # 13 # At the start of a SubX program: 14 # argc: *ESP 15 # argv[0]: *(ESP+4) 16 # argv[1]: *(ESP+8) 17 # ... 18 # Locals start from ESP-4 downwards. 19 20 == code 21 # instruction effective address register displacement immediate 22 # . op subop mod rm32 base index scale r32 23 # . 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 24 25 # . prolog 26 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP 27 # ascii-difference(argv[1], argv[2]) 28 # . . push argv[2] 29 ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) 30 # . . push argv[1] 31 ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) 32 # . . call 33 e8/call <a href='ex9.subx.html#L41'>ascii-difference</a>/disp32 34 # . . discard args 35 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP 36 # syscall(exit, EAX) 37 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX 38 b8/copy-to-EAX 1/imm32/exit 39 cd/syscall 0x80/imm8 40 41 ascii-difference: # (s1, s2) : null-terminated ascii strings 42 # a = first letter of s1 (ECX) 43 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 0/r32/EAX 4/disp8 . # copy *(ESP+4) to EAX 44 8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX 45 # b = first letter of s2 (EDX) 46 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 1/r32/ECX 8/disp8 # copy *(ESP+8) to ECX 47 8b/copy 0/mod/indirect 1/rm32/ECX . . . 1/r32/ECX . . # copy *ECX to ECX 48 # a-b 49 29/subtract 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # subtract ECX from EAX 50 c3/return 51 52 # . . vim:nowrap:textwidth=0 </pre> </body> </html>


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