171 lines
13 KiB
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171 lines
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<a href='https://github.com/akkartik/mu/blob/master/subx/examples/ex7.subx'>https://github.com/akkartik/mu/blob/master/subx/examples/ex7.subx</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Example showing file syscalls.</span>
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<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
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<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Create a file, open it for writing, write a character to it, close it, open</span>
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<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># it for reading, read a character from it, close it, delete it, and return</span>
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<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># the character read.</span>
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<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#</span>
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<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># To run (from the subx directory):</span>
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<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># $ subx translate examples/ex7.subx -o examples/ex7</span>
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<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># $ subx run examples/ex7</span>
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<span id="L10" class="LineNr"> 10 </span><span class="subxComment"># Expected result:</span>
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<span id="L11" class="LineNr"> 11 </span><span class="subxComment"># $ echo $?</span>
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<span id="L12" class="LineNr"> 12 </span><span class="subxComment"># 97</span>
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<span id="L13" class="LineNr"> 13 </span>
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<span id="L14" class="LineNr"> 14 </span>== code
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<span id="L15" class="LineNr"> 15 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
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<span id="L16" class="LineNr"> 16 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
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<span id="L17" class="LineNr"> 17 </span><span class="subxS1Comment"># . 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</span>
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<span id="L18" class="LineNr"> 18 </span>
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<span id="L19" class="LineNr"> 19 </span> <span class="subxComment"># syscall(creat, Filename)</span>
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<span id="L20" class="LineNr"> 20 </span> bb/copy-to-EBX <span class="SpecialChar">Filename</span>/imm32
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<span id="L21" class="LineNr"> 21 </span> b9/copy-to-ECX 0x180/imm32/fixed-perms
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<span id="L22" class="LineNr"> 22 </span> b8/copy-to-EAX 8/imm32/creat
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<span id="L23" class="LineNr"> 23 </span> cd/syscall 0x80/imm8
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<span id="L24" class="LineNr"> 24 </span>
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<span id="L25" class="LineNr"> 25 </span> <span class="subxComment"># stream = syscall(open, Filename, O_WRONLY, 0) # we can't use 'fd' because it looks like a hex byte</span>
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<span id="L26" class="LineNr"> 26 </span> bb/copy-to-EBX <span class="SpecialChar">Filename</span>/imm32
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<span id="L27" class="LineNr"> 27 </span> b9/copy-to-ECX 1/imm32/wronly
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<span id="L28" class="LineNr"> 28 </span> ba/copy-to-EDX 0x180/imm32/fixed-perms
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<span id="L29" class="LineNr"> 29 </span> b8/copy-to-EAX 5/imm32/open
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<span id="L30" class="LineNr"> 30 </span> cd/syscall 0x80/imm8
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<span id="L31" class="LineNr"> 31 </span> <span class="subxComment"># save stream</span>
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<span id="L32" class="LineNr"> 32 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L33" class="LineNr"> 33 </span> 89/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to *EBX</span>
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<span id="L34" class="LineNr"> 34 </span>
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<span id="L35" class="LineNr"> 35 </span> <span class="subxComment"># syscall(write, Stream, "a", 1)</span>
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<span id="L36" class="LineNr"> 36 </span> <span class="subxS1Comment"># . load stream</span>
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<span id="L37" class="LineNr"> 37 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L38" class="LineNr"> 38 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 3/r32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy *EBX to EBX</span>
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<span id="L39" class="LineNr"> 39 </span> <span class="subxS1Comment"># .</span>
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<span id="L40" class="LineNr"> 40 </span> b9/copy-to-ECX <span class="SpecialChar">A</span>/imm32
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<span id="L41" class="LineNr"> 41 </span> ba/copy-to-EDX 1/imm32/size
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<span id="L42" class="LineNr"> 42 </span> b8/copy-to-EAX 4/imm32/write
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<span id="L43" class="LineNr"> 43 </span> cd/syscall 0x80/imm8
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<span id="L44" class="LineNr"> 44 </span>
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<span id="L45" class="LineNr"> 45 </span> <span class="subxComment"># syscall(close, Stream)</span>
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<span id="L46" class="LineNr"> 46 </span> <span class="subxS1Comment"># . load stream</span>
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<span id="L47" class="LineNr"> 47 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L48" class="LineNr"> 48 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 3/r32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy *EBX to EBX</span>
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<span id="L49" class="LineNr"> 49 </span> <span class="subxS1Comment"># .</span>
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<span id="L50" class="LineNr"> 50 </span> b8/copy-to-EAX 6/imm32/close
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<span id="L51" class="LineNr"> 51 </span> cd/syscall 0x80/imm8
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<span id="L52" class="LineNr"> 52 </span>
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<span id="L53" class="LineNr"> 53 </span> <span class="subxComment"># stream = syscall(open, Filename, O_RDONLY, 0)</span>
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<span id="L54" class="LineNr"> 54 </span> bb/copy-to-EBX <span class="SpecialChar">Filename</span>/imm32
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<span id="L55" class="LineNr"> 55 </span> b9/copy-to-ECX 0/imm32/rdonly
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<span id="L56" class="LineNr"> 56 </span> ba/copy-to-EDX 0x180/imm32/fixed-perms
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<span id="L57" class="LineNr"> 57 </span> b8/copy-to-EAX 5/imm32/open
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<span id="L58" class="LineNr"> 58 </span> cd/syscall 0x80/imm8
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<span id="L59" class="LineNr"> 59 </span> <span class="subxS1Comment"># . save Stream</span>
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<span id="L60" class="LineNr"> 60 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L61" class="LineNr"> 61 </span> 89/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/r32/EAX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy EAX to *EBX</span>
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<span id="L62" class="LineNr"> 62 </span>
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<span id="L63" class="LineNr"> 63 </span> <span class="subxComment"># syscall(read, Stream, B, 1)</span>
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<span id="L64" class="LineNr"> 64 </span> <span class="subxS1Comment"># . load stream</span>
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<span id="L65" class="LineNr"> 65 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L66" class="LineNr"> 66 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 3/r32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy *EBX to EBX</span>
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<span id="L67" class="LineNr"> 67 </span> <span class="subxS1Comment"># .</span>
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<span id="L68" class="LineNr"> 68 </span> b9/copy-to-ECX <span class="SpecialChar">B</span>/imm32
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<span id="L69" class="LineNr"> 69 </span> ba/copy-to-EDX 1/imm32/size
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<span id="L70" class="LineNr"> 70 </span> b8/copy-to-EAX 3/imm32/read
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<span id="L71" class="LineNr"> 71 </span> cd/syscall 0x80/imm8
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<span id="L72" class="LineNr"> 72 </span>
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<span id="L73" class="LineNr"> 73 </span> <span class="subxComment"># syscall(close, Stream)</span>
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<span id="L74" class="LineNr"> 74 </span> <span class="subxS1Comment"># . load stream</span>
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<span id="L75" class="LineNr"> 75 </span> bb/copy-to-EBX <span class="SpecialChar">Stream</span>/imm32
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<span id="L76" class="LineNr"> 76 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 3/r32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy *EBX to EBX</span>
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<span id="L77" class="LineNr"> 77 </span> <span class="subxComment">#</span>
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<span id="L78" class="LineNr"> 78 </span> b8/copy-to-EAX 6/imm32/close
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<span id="L79" class="LineNr"> 79 </span> cd/syscall 0x80/imm8
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<span id="L80" class="LineNr"> 80 </span>
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<span id="L81" class="LineNr"> 81 </span> <span class="subxComment"># syscall(unlink, filename)</span>
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<span id="L82" class="LineNr"> 82 </span> bb/copy-to-EBX <span class="SpecialChar">Filename</span>/imm32
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<span id="L83" class="LineNr"> 83 </span> b8/copy-to-EAX 0xa/imm32/unlink
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<span id="L84" class="LineNr"> 84 </span> cd/syscall 0x80/imm8
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<span id="L85" class="LineNr"> 85 </span>
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<span id="L86" class="LineNr"> 86 </span> <span class="subxComment"># syscall(exit, b)</span>
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<span id="L87" class="LineNr"> 87 </span> <span class="subxS1Comment"># . load b</span>
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<span id="L88" class="LineNr"> 88 </span> bb/copy-to-EBX <span class="SpecialChar">B</span>/imm32
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<span id="L89" class="LineNr"> 89 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 3/r32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="subxComment"># copy *EBX to EBX</span>
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<span id="L90" class="LineNr"> 90 </span> <span class="subxComment">#</span>
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<span id="L91" class="LineNr"> 91 </span> b8/copy-to-EAX 1/imm32/exit
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<span id="L92" class="LineNr"> 92 </span> cd/syscall 0x80/imm8
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<span id="L93" class="LineNr"> 93 </span>
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<span id="L94" class="LineNr"> 94 </span>== data
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<span id="L95" class="LineNr"> 95 </span>
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<span id="L96" class="LineNr"> 96 </span><span class="SpecialChar">Stream</span>:
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<span id="L97" class="LineNr"> 97 </span> 00 00 00 00
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<span id="L98" class="LineNr"> 98 </span><span class="SpecialChar">A</span>:
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<span id="L99" class="LineNr"> 99 </span> 61 00 00 00
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<span id="L100" class="LineNr">100 </span><span class="SpecialChar">B</span>:
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<span id="L101" class="LineNr">101 </span> 00 00 00 00
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<span id="L102" class="LineNr">102 </span><span class="SpecialChar">Filename</span>:
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<span id="L103" class="LineNr">103 </span> 2e 66 6f 6f 00 00 00 00
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<span id="L104" class="LineNr">104 </span>
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<span id="L105" class="LineNr">105 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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