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authorKartik Agaram <vc@akkartik.com>2018-12-03 23:26:56 -0800
committerKartik Agaram <vc@akkartik.com>2018-12-03 23:26:56 -0800
commit5f3b3e7aea4174f13da9b430538564c68257b647 (patch)
tree64b0ca70a7508aa10a008ad7d996f5d4f38214c8 /html/subx/063print-byte.subx.html
parentee73f5eb31e9dd5a185da097bd990ac94c3d282b (diff)
downloadmu-5f3b3e7aea4174f13da9b430538564c68257b647.tar.gz
4830
New helper: printing a byte in textual (hex) form.

This required adding instructions for bitwise shift operations.
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="subxComment"># Print the (hex) textual representation of the lowest byte of a number.</span>
+<span id="L2" class="LineNr">  2 </span>
+<span id="L3" class="LineNr">  3 </span>== code
+<span id="L4" class="LineNr">  4 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
+<span id="L5" class="LineNr">  5 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
+<span id="L6" class="LineNr">  6 </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>
+<span id="L7" class="LineNr">  7 </span>
+<span id="L8" class="LineNr">  8 </span><span class="subxComment"># main:</span>
+<span id="L9" class="LineNr">  9 </span>    e8/call  run-tests/disp32  <span class="subxComment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
+<span id="L10" class="LineNr"> 10 </span>    <span class="subxComment"># syscall(exit, Num-test-failures)</span>
+<span id="L11" class="LineNr"> 11 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          3/r32/EBX   <span class="SpecialChar">Num-test-failures</span>/disp32          <span class="subxComment"># copy *Num-test-failures to EBX</span>
+<span id="L12" class="LineNr"> 12 </span>    b8/copy-to-EAX  1/imm32
+<span id="L13" class="LineNr"> 13 </span>    cd/syscall  0x80/imm8
+<span id="L14" class="LineNr"> 14 </span>
+<span id="L15" class="LineNr"> 15 </span><span class="subxFunction">print-byte</span>:  <span class="subxComment"># f : (address buffered-file), n : num -&gt; &lt;void&gt;</span>
+<span id="L16" class="LineNr"> 16 </span>    <span class="subxS1Comment"># . prolog</span>
+<span id="L17" class="LineNr"> 17 </span>    55/push-EBP
+<span id="L18" class="LineNr"> 18 </span>    89/copy                         3/mod/direct    5/rm32/EBP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
+<span id="L19" class="LineNr"> 19 </span>    <span class="subxS1Comment"># . save registers</span>
+<span id="L20" class="LineNr"> 20 </span>    50/push-EAX
+<span id="L21" class="LineNr"> 21 </span>    <span class="subxComment"># AL = convert upper nibble to hex</span>
+<span id="L22" class="LineNr"> 22 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          0/r32/EAX   0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+12) to EAX</span>
+<span id="L23" class="LineNr"> 23 </span>    c1/shift    5/subop/logic-right 3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm8            <span class="subxComment"># shift EAX right by 4 bits, while padding zeroes</span>
+<span id="L24" class="LineNr"> 24 </span>    <span class="subxS1Comment"># . hex-char(AL)</span>
+<span id="L25" class="LineNr"> 25 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L26" class="LineNr"> 26 </span>    50/push-EAX
+<span id="L27" class="LineNr"> 27 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L28" class="LineNr"> 28 </span>    e8/call  hex-char/disp32
+<span id="L29" class="LineNr"> 29 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L30" class="LineNr"> 30 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L31" class="LineNr"> 31 </span>    <span class="subxComment"># write-byte(f, AL)</span>
+<span id="L32" class="LineNr"> 32 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L33" class="LineNr"> 33 </span>    50/push-EAX
+<span id="L34" class="LineNr"> 34 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0x8/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+8)</span>
+<span id="L35" class="LineNr"> 35 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L36" class="LineNr"> 36 </span>    e8/call  write-byte/disp32
+<span id="L37" class="LineNr"> 37 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L38" class="LineNr"> 38 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L39" class="LineNr"> 39 </span>    <span class="subxComment"># AL = convert lower nibble to hex</span>
+<span id="L40" class="LineNr"> 40 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          0/r32/EAX   0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+12) to EAX</span>
+<span id="L41" class="LineNr"> 41 </span>    25/and-EAX  0xf/imm32
+<span id="L42" class="LineNr"> 42 </span>    <span class="subxS1Comment"># . hex-char(AL)</span>
+<span id="L43" class="LineNr"> 43 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L44" class="LineNr"> 44 </span>    50/push-EAX
+<span id="L45" class="LineNr"> 45 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L46" class="LineNr"> 46 </span>    e8/call  hex-char/disp32
+<span id="L47" class="LineNr"> 47 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L48" class="LineNr"> 48 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L49" class="LineNr"> 49 </span>    <span class="subxComment"># write-byte(f, AL)</span>
+<span id="L50" class="LineNr"> 50 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L51" class="LineNr"> 51 </span>    50/push-EAX
+<span id="L52" class="LineNr"> 52 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0x8/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+8)</span>
+<span id="L53" class="LineNr"> 53 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L54" class="LineNr"> 54 </span>    e8/call  write-byte/disp32
+<span id="L55" class="LineNr"> 55 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L56" class="LineNr"> 56 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L57" class="LineNr"> 57 </span>    <span class="subxS1Comment"># . restore registers</span>
+<span id="L58" class="LineNr"> 58 </span>    59/pop-to-ECX
+<span id="L59" class="LineNr"> 59 </span>    58/pop-to-EAX
+<span id="L60" class="LineNr"> 60 </span>    <span class="subxS1Comment"># . epilog</span>
+<span id="L61" class="LineNr"> 61 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
+<span id="L62" class="LineNr"> 62 </span>    5d/pop-to-EBP
+<span id="L63" class="LineNr"> 63 </span>    c3/return
+<span id="L64" class="LineNr"> 64 </span>
+<span id="L65" class="LineNr"> 65 </span><span class="subxComment"># extract lowest 4 bits and convert to 8-byte ascii</span>
+<span id="L66" class="LineNr"> 66 </span><span class="subxComment"># return 0xffffffff if more than 4 bits are set</span>
+<span id="L67" class="LineNr"> 67 </span><span class="subxFunction">hex-char</span>:  <span class="subxComment"># n : num -&gt; char_or_error/EAX</span>
+<span id="L68" class="LineNr"> 68 </span>    <span class="subxS1Comment"># . prolog</span>
+<span id="L69" class="LineNr"> 69 </span>    55/push-EBP
+<span id="L70" class="LineNr"> 70 </span>    89/copy                         3/mod/direct    5/rm32/EBP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
+<span id="L71" class="LineNr"> 71 </span>    <span class="subxComment"># EAX = n</span>
+<span id="L72" class="LineNr"> 72 </span>    8b/copy                         1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>          0/r32/EAX   8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy *(EBP+8) to EAX</span>
+<span id="L73" class="LineNr"> 73 </span>    <span class="subxComment"># if it's &lt;= 9 add '0' to it</span>
+<span id="L74" class="LineNr"> 74 </span>    81          7/subop/compare     3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0x9/imm32         <span class="subxComment"># compare EAX</span>
+<span id="L75" class="LineNr"> 75 </span>    7f/jump-if-greater  $hex-char:check2/disp8
+<span id="L76" class="LineNr"> 76 </span>    05/add-to-EAX  0x30/imm32/'0'
+<span id="L77" class="LineNr"> 77 </span>    eb/jump  $hex-char:end/disp8
+<span id="L78" class="LineNr"> 78 </span><span class="Constant">$hex-char:check2</span>:
+<span id="L79" class="LineNr"> 79 </span>    <span class="subxComment"># else if it's &lt;= 15 add ('a' - 10) to it</span>
+<span id="L80" class="LineNr"> 80 </span>    81          7/subop/compare     3/mod/direct    0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xf/imm32         <span class="subxComment"># compare EAX</span>
+<span id="L81" class="LineNr"> 81 </span>    7f/jump-if-greater  $hex-char:error/disp8
+<span id="L82" class="LineNr"> 82 </span>    05/add-to-EAX  0x57/imm32  <span class="subxComment"># 'a' - 10</span>
+<span id="L83" class="LineNr"> 83 </span>    eb/jump  $hex-char:end/disp8
+<span id="L84" class="LineNr"> 84 </span><span class="Constant">$hex-char:error</span>:
+<span id="L85" class="LineNr"> 85 </span>    <span class="subxComment"># otherwise return 0xffffffff</span>
+<span id="L86" class="LineNr"> 86 </span>    b8/copy-to-EAX  0xffffffff/imm32
+<span id="L87" class="LineNr"> 87 </span><span class="Constant">$hex-char:end</span>:
+<span id="L88" class="LineNr"> 88 </span>    <span class="subxS1Comment"># . epilog</span>
+<span id="L89" class="LineNr"> 89 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
+<span id="L90" class="LineNr"> 90 </span>    5d/pop-to-EBP
+<span id="L91" class="LineNr"> 91 </span>    c3/return
+<span id="L92" class="LineNr"> 92 </span>
+<span id="L93" class="LineNr"> 93 </span><span class="subxTest">test-print-byte</span>:
+<span id="L94" class="LineNr"> 94 </span>    <span class="subxH1Comment"># - check that print-byte prints the hex textual representation</span>
+<span id="L95" class="LineNr"> 95 </span>    <span class="subxComment"># setup</span>
+<span id="L96" class="LineNr"> 96 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
+<span id="L97" class="LineNr"> 97 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L98" class="LineNr"> 98 </span>    68/push  _test-stream/imm32
+<span id="L99" class="LineNr"> 99 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L100" class="LineNr">100 </span>    e8/call  clear-stream/disp32
+<span id="L101" class="LineNr">101 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L102" class="LineNr">102 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L103" class="LineNr">103 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
+<span id="L104" class="LineNr">104 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L105" class="LineNr">105 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L106" class="LineNr">106 </span>    05/add-to-EAX  4/imm32
+<span id="L107" class="LineNr">107 </span>    50/push-EAX
+<span id="L108" class="LineNr">108 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L109" class="LineNr">109 </span>    e8/call  clear-stream/disp32
+<span id="L110" class="LineNr">110 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L111" class="LineNr">111 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L112" class="LineNr">112 </span>    <span class="subxComment"># print-byte(_test-buffered-file, 0xa)  # exercises digit, non-digit as well as leading zero</span>
+<span id="L113" class="LineNr">113 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L114" class="LineNr">114 </span>    68/push  0xa/imm32
+<span id="L115" class="LineNr">115 </span>    68/push  _test-buffered-file/imm32
+<span id="L116" class="LineNr">116 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L117" class="LineNr">117 </span>    e8/call  print-byte/disp32
+<span id="L118" class="LineNr">118 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L119" class="LineNr">119 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L120" class="LineNr">120 </span>    <span class="subxComment"># flush(_test-buffered-file)</span>
+<span id="L121" class="LineNr">121 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L122" class="LineNr">122 </span>    68/push  _test-buffered-file/imm32
+<span id="L123" class="LineNr">123 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L124" class="LineNr">124 </span>    e8/call  flush/disp32
+<span id="L125" class="LineNr">125 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L126" class="LineNr">126 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              4/imm32           <span class="subxComment"># add to ESP</span>
+<span id="L127" class="LineNr">127 </span>    <span class="subxComment"># check-ints-equal(*_test-stream-&gt;data, '0a', msg)</span>
+<span id="L128" class="LineNr">128 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L129" class="LineNr">129 </span>    68/push  <span class="Constant">&quot;F - test-print-byte&quot;</span>/imm32
+<span id="L130" class="LineNr">130 </span>    68/push  0x6130/imm32/0a
+<span id="L131" class="LineNr">131 </span>    <span class="subxS2Comment"># . . push *_test-stream-&gt;data</span>
+<span id="L132" class="LineNr">132 </span>    b8/copy-to-EAX  _test-stream/imm32
+<span id="L133" class="LineNr">133 </span>    ff          6/subop/push        1/mod/*+disp8   0/rm32/EAX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EAX+12)</span>
+<span id="L134" class="LineNr">134 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L135" class="LineNr">135 </span>    e8/call  check-ints-equal/disp32
+<span id="L136" class="LineNr">136 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L137" class="LineNr">137 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              0xc/imm32         <span class="subxComment"># add to ESP</span>
+<span id="L138" class="LineNr">138 </span>    <span class="subxS1Comment"># . end</span>
+<span id="L139" class="LineNr">139 </span>    c3/return
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->