about summary refs log tree commit diff stats
path: root/html
diff options
context:
space:
mode:
authorKartik Agaram <vc@akkartik.com>2018-12-03 12:03:23 -0800
committerKartik Agaram <vc@akkartik.com>2018-12-03 12:03:23 -0800
commit91dab3e1a499cac50abd146ce849d3dab94229ab (patch)
tree0ae698ea9ed9e1e3523aa6e5aefa9e0b8c8e2400 /html
parent26efb5f5c2a3ddbaf82f06e6ca6090caf7ab5a16 (diff)
downloadmu-91dab3e1a499cac50abd146ce849d3dab94229ab.tar.gz
4824
Diffstat (limited to 'html')
-rw-r--r--html/subx/053new_segment.subx.html14
-rw-r--r--html/subx/059read-byte.subx.html311
-rw-r--r--html/subx/examples/ex12.subx.html4
-rw-r--r--html/subx/examples/ex7.subx.html14
4 files changed, 170 insertions, 173 deletions
diff --git a/html/subx/053new_segment.subx.html b/html/subx/053new_segment.subx.html
index 8ae47381..92a3f0e5 100644
--- a/html/subx/053new_segment.subx.html
+++ b/html/subx/053new_segment.subx.html
@@ -75,33 +75,33 @@ if ('onhashchange' in window) {
 <span id="L12" class="LineNr">12 </span>    <span class="subxS2Comment"># . . call</span>
 <span id="L13" class="LineNr">13 </span>    e8/call  new-segment/disp32
 <span id="L14" class="LineNr">14 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L15" class="LineNr">15 </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="L15" class="LineNr">15 </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="L16" class="LineNr">16 </span>
 <span id="L17" class="LineNr">17 </span>    <span class="subxComment"># write to *EAX to check that we have access to the newly-allocated segment</span>
-<span id="L18" class="LineNr">18 </span>    c7/copy                         0/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>              0x34/imm32              <span class="subxComment"># copy to *EAX</span>
+<span id="L18" class="LineNr">18 </span>    c7/copy                         0/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>              0x34/imm32        <span class="subxComment"># copy to *EAX</span>
 <span id="L19" class="LineNr">19 </span>
 <span id="L20" class="LineNr">20 </span>    <span class="subxComment"># syscall(exit, EAX)</span>
-<span id="L21" class="LineNr">21 </span>    89/copy                         3/mod/direct    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>
+<span id="L21" class="LineNr">21 </span>    89/copy                         3/mod/direct    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>
 <span id="L22" class="LineNr">22 </span>    b8/copy-to-EAX  1/imm32/exit
 <span id="L23" class="LineNr">23 </span>    cd/syscall  0x80/imm8
 <span id="L24" class="LineNr">24 </span>
 <span id="L25" class="LineNr">25 </span><span class="subxFunction">new-segment</span>:  <span class="subxComment"># len : int -&gt; address</span>
 <span id="L26" class="LineNr">26 </span>    <span class="subxS1Comment"># . prolog</span>
 <span id="L27" class="LineNr">27 </span>    55/push-EBP
-<span id="L28" class="LineNr">28 </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="L28" class="LineNr">28 </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="L29" class="LineNr">29 </span>    53/push-EBX
 <span id="L30" class="LineNr">30 </span>    <span class="subxComment"># copy len to _mmap-new-segment-&gt;len</span>
 <span id="L31" class="LineNr">31 </span>    <span class="subxComment"># TODO: compute _mmap-new-segment+4 before runtime</span>
-<span id="L32" class="LineNr">32 </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="L32" class="LineNr">32 </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="L33" class="LineNr">33 </span>    bb/copy-to-EBX  _mmap-new-segment/imm32
-<span id="L34" class="LineNr">34 </span>    89/copy                         1/mod/*+disp8   3/rm32/EBX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX   4/disp8        <span class="CommentedCode"> . </span>                      <span class="subxComment"># copy EAX to *(EBX+4)</span>
+<span id="L34" class="LineNr">34 </span>    89/copy                         1/mod/*+disp8   3/rm32/EBX   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          0/r32/EAX   4/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EAX to *(EBX+4)</span>
 <span id="L35" class="LineNr">35 </span>    <span class="subxComment"># mmap(_mmap-new-segment)</span>
 <span id="L36" class="LineNr">36 </span>    bb/copy-to-EBX  _mmap-new-segment/imm32
 <span id="L37" class="LineNr">37 </span>    b8/copy-to-EAX  0x5a/imm32/mmap
 <span id="L38" class="LineNr">38 </span>    cd/syscall  0x80/imm8
 <span id="L39" class="LineNr">39 </span>    <span class="subxS1Comment"># . epilog</span>
 <span id="L40" class="LineNr">40 </span>    5b/pop-to-EBX
-<span id="L41" class="LineNr">41 </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="L41" class="LineNr">41 </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="L42" class="LineNr">42 </span>    5d/pop-to-EBP
 <span id="L43" class="LineNr">43 </span>    c3/return
 <span id="L44" class="LineNr">44 </span>
diff --git a/html/subx/059read-byte.subx.html b/html/subx/059read-byte.subx.html
index ad958670..e23ec5a7 100644
--- a/html/subx/059read-byte.subx.html
+++ b/html/subx/059read-byte.subx.html
@@ -160,163 +160,160 @@ if ('onhashchange' in window) {
 <span id="L94" class="LineNr"> 94 </span>    5d/pop-to-EBP
 <span id="L95" class="LineNr"> 95 </span>    c3/return
 <span id="L96" class="LineNr"> 96 </span>
-<span id="L97" class="LineNr"> 97 </span><span class="subxComment"># todo: how should write-byte look? What should it do when the output has no</span>
-<span id="L98" class="LineNr"> 98 </span><span class="subxComment"># space remaining? Maybe return an error code.</span>
-<span id="L99" class="LineNr"> 99 </span>
-<span id="L100" class="LineNr">100 </span><span class="subxH1Comment"># - tests</span>
-<span id="L101" class="LineNr">101 </span>
-<span id="L102" class="LineNr">102 </span><span class="subxTest">test-read-byte-single</span>:
-<span id="L103" class="LineNr">103 </span>    <span class="subxH1Comment"># - check that read-byte returns first byte of 'file'</span>
-<span id="L104" class="LineNr">104 </span>    <span class="subxComment"># setup</span>
-<span id="L105" class="LineNr">105 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
-<span id="L106" class="LineNr">106 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L107" class="LineNr">107 </span>    68/push  _test-stream/imm32
-<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="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
-<span id="L113" class="LineNr">113 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L114" class="LineNr">114 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
-<span id="L115" class="LineNr">115 </span>    05/add-to-EAX  4/imm32
-<span id="L116" class="LineNr">116 </span>    50/push-EAX
-<span id="L117" class="LineNr">117 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L118" class="LineNr">118 </span>    e8/call  clear-stream/disp32
-<span id="L119" class="LineNr">119 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L120" class="LineNr">120 </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="L121" class="LineNr">121 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
-<span id="L122" class="LineNr">122 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L123" class="LineNr">123 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
-<span id="L124" class="LineNr">124 </span>    68/push  _test-stream/imm32
-<span id="L125" class="LineNr">125 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L126" class="LineNr">126 </span>    e8/call  write/disp32
-<span id="L127" class="LineNr">127 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L128" class="LineNr">128 </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="L129" class="LineNr">129 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
-<span id="L130" class="LineNr">130 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L131" class="LineNr">131 </span>    68/push  _test-buffered-file/imm32
-<span id="L132" class="LineNr">132 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L133" class="LineNr">133 </span>    e8/call  read-byte/disp32
-<span id="L134" class="LineNr">134 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L135" class="LineNr">135 </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="L136" class="LineNr">136 </span>    <span class="subxComment"># check-ints-equal(EAX, 'A', msg)</span>
-<span id="L137" class="LineNr">137 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L138" class="LineNr">138 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-single&quot;</span>/imm32
-<span id="L139" class="LineNr">139 </span>    68/push  0x41/imm32
-<span id="L140" class="LineNr">140 </span>    50/push-EAX
-<span id="L141" class="LineNr">141 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L142" class="LineNr">142 </span>    e8/call  check-ints-equal/disp32
-<span id="L143" class="LineNr">143 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L144" class="LineNr">144 </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="L145" class="LineNr">145 </span>    <span class="subxS1Comment"># . end</span>
-<span id="L146" class="LineNr">146 </span>    c3/return
-<span id="L147" class="LineNr">147 </span>
-<span id="L148" class="LineNr">148 </span><span class="subxTest">test-read-byte-multiple</span>:
-<span id="L149" class="LineNr">149 </span>    <span class="subxH1Comment"># - call read-byte twice, check that second call returns second byte</span>
-<span id="L150" class="LineNr">150 </span>    <span class="subxComment"># setup</span>
-<span id="L151" class="LineNr">151 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
-<span id="L152" class="LineNr">152 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L153" class="LineNr">153 </span>    68/push  _test-stream/imm32
-<span id="L154" class="LineNr">154 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L155" class="LineNr">155 </span>    e8/call  clear-stream/disp32
-<span id="L156" class="LineNr">156 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L157" class="LineNr">157 </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="L158" class="LineNr">158 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
-<span id="L159" class="LineNr">159 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L160" class="LineNr">160 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
-<span id="L161" class="LineNr">161 </span>    05/add-to-EAX  4/imm32
-<span id="L162" class="LineNr">162 </span>    50/push-EAX
-<span id="L163" class="LineNr">163 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L164" class="LineNr">164 </span>    e8/call  clear-stream/disp32
-<span id="L165" class="LineNr">165 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L166" class="LineNr">166 </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="L167" class="LineNr">167 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
-<span id="L168" class="LineNr">168 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L169" class="LineNr">169 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
-<span id="L170" class="LineNr">170 </span>    68/push  _test-stream/imm32
-<span id="L171" class="LineNr">171 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L172" class="LineNr">172 </span>    e8/call  write/disp32
-<span id="L173" class="LineNr">173 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L174" class="LineNr">174 </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="L175" class="LineNr">175 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
-<span id="L176" class="LineNr">176 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L177" class="LineNr">177 </span>    68/push  _test-buffered-file/imm32
-<span id="L178" class="LineNr">178 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L179" class="LineNr">179 </span>    e8/call  read-byte/disp32
-<span id="L180" class="LineNr">180 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L181" class="LineNr">181 </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="L182" class="LineNr">182 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
-<span id="L183" class="LineNr">183 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L184" class="LineNr">184 </span>    68/push  _test-buffered-file/imm32
-<span id="L185" class="LineNr">185 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L186" class="LineNr">186 </span>    e8/call  read-byte/disp32
-<span id="L187" class="LineNr">187 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L188" class="LineNr">188 </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="L189" class="LineNr">189 </span>    <span class="subxComment"># check-ints-equal(EAX, 'b', msg)</span>
-<span id="L190" class="LineNr">190 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L191" class="LineNr">191 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-multiple&quot;</span>/imm32
-<span id="L192" class="LineNr">192 </span>    68/push  0x62/imm32
-<span id="L193" class="LineNr">193 </span>    50/push-EAX
-<span id="L194" class="LineNr">194 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L195" class="LineNr">195 </span>    e8/call  check-ints-equal/disp32
-<span id="L196" class="LineNr">196 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L197" class="LineNr">197 </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="L198" class="LineNr">198 </span>    <span class="subxS1Comment"># . end</span>
-<span id="L199" class="LineNr">199 </span>    c3/return
-<span id="L200" class="LineNr">200 </span>
-<span id="L201" class="LineNr">201 </span><span class="subxTest">test-read-byte-end-of-file</span>:
-<span id="L202" class="LineNr">202 </span>    <span class="subxH1Comment"># - call read-byte on an empty 'file', check that it returns -1</span>
-<span id="L203" class="LineNr">203 </span>    <span class="subxComment"># setup</span>
-<span id="L204" class="LineNr">204 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
-<span id="L205" class="LineNr">205 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L206" class="LineNr">206 </span>    68/push  _test-stream/imm32
-<span id="L207" class="LineNr">207 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L208" class="LineNr">208 </span>    e8/call  clear-stream/disp32
-<span id="L209" class="LineNr">209 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L210" class="LineNr">210 </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="L211" class="LineNr">211 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
-<span id="L212" class="LineNr">212 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L213" class="LineNr">213 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
-<span id="L214" class="LineNr">214 </span>    05/add-to-EAX  4/imm32
-<span id="L215" class="LineNr">215 </span>    50/push-EAX
-<span id="L216" class="LineNr">216 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L217" class="LineNr">217 </span>    e8/call  clear-stream/disp32
-<span id="L218" class="LineNr">218 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L219" class="LineNr">219 </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="L220" class="LineNr">220 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
-<span id="L221" class="LineNr">221 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L222" class="LineNr">222 </span>    68/push  _test-buffered-file/imm32
-<span id="L223" class="LineNr">223 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L224" class="LineNr">224 </span>    e8/call  read-byte/disp32
-<span id="L225" class="LineNr">225 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L226" class="LineNr">226 </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="L227" class="LineNr">227 </span>    <span class="subxComment"># check-ints-equal(EAX, -1, msg)</span>
-<span id="L228" class="LineNr">228 </span>    <span class="subxS2Comment"># . . push args</span>
-<span id="L229" class="LineNr">229 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-end-of-file&quot;</span>/imm32
-<span id="L230" class="LineNr">230 </span>    68/push  -1/imm32
-<span id="L231" class="LineNr">231 </span>    50/push-EAX
-<span id="L232" class="LineNr">232 </span>    <span class="subxS2Comment"># . . call</span>
-<span id="L233" class="LineNr">233 </span>    e8/call  check-ints-equal/disp32
-<span id="L234" class="LineNr">234 </span>    <span class="subxS2Comment"># . . discard args</span>
-<span id="L235" class="LineNr">235 </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="L236" class="LineNr">236 </span>    <span class="subxS1Comment"># . end</span>
-<span id="L237" class="LineNr">237 </span>    c3/return
-<span id="L238" class="LineNr">238 </span>
-<span id="L239" class="LineNr">239 </span>== data
-<span id="L240" class="LineNr">240 </span>
-<span id="L241" class="LineNr">241 </span><span class="subxMinorFunction">_test-buffered-file</span>:
-<span id="L242" class="LineNr">242 </span>    <span class="subxComment"># file descriptor or (address stream)</span>
-<span id="L243" class="LineNr">243 </span>    _test-stream/imm32
-<span id="L244" class="LineNr">244 </span>    <span class="subxComment"># current write index</span>
-<span id="L245" class="LineNr">245 </span>    00 00 00 00
-<span id="L246" class="LineNr">246 </span>    <span class="subxComment"># current read index</span>
-<span id="L247" class="LineNr">247 </span>    00 00 00 00
-<span id="L248" class="LineNr">248 </span>    <span class="subxComment"># length (8)</span>
-<span id="L249" class="LineNr">249 </span>    08 00 00 00
-<span id="L250" class="LineNr">250 </span>    <span class="subxComment"># data</span>
-<span id="L251" class="LineNr">251 </span>    00 00 00 00 00 00 00 00  <span class="subxComment"># 8 bytes</span>
-<span id="L252" class="LineNr">252 </span>
-<span id="L253" class="LineNr">253 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
+<span id="L97" class="LineNr"> 97 </span><span class="subxH1Comment"># - tests</span>
+<span id="L98" class="LineNr"> 98 </span>
+<span id="L99" class="LineNr"> 99 </span><span class="subxTest">test-read-byte-single</span>:
+<span id="L100" class="LineNr">100 </span>    <span class="subxH1Comment"># - check that read-byte returns first byte of 'file'</span>
+<span id="L101" class="LineNr">101 </span>    <span class="subxComment"># setup</span>
+<span id="L102" class="LineNr">102 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
+<span id="L103" class="LineNr">103 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L104" class="LineNr">104 </span>    68/push  _test-stream/imm32
+<span id="L105" class="LineNr">105 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L106" class="LineNr">106 </span>    e8/call  clear-stream/disp32
+<span id="L107" class="LineNr">107 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L108" class="LineNr">108 </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="L109" class="LineNr">109 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
+<span id="L110" class="LineNr">110 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L111" class="LineNr">111 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L112" class="LineNr">112 </span>    05/add-to-EAX  4/imm32
+<span id="L113" class="LineNr">113 </span>    50/push-EAX
+<span id="L114" class="LineNr">114 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L115" class="LineNr">115 </span>    e8/call  clear-stream/disp32
+<span id="L116" class="LineNr">116 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L117" class="LineNr">117 </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="L118" class="LineNr">118 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
+<span id="L119" class="LineNr">119 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L120" class="LineNr">120 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
+<span id="L121" class="LineNr">121 </span>    68/push  _test-stream/imm32
+<span id="L122" class="LineNr">122 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L123" class="LineNr">123 </span>    e8/call  write/disp32
+<span id="L124" class="LineNr">124 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L125" class="LineNr">125 </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="L126" class="LineNr">126 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
+<span id="L127" class="LineNr">127 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L128" class="LineNr">128 </span>    68/push  _test-buffered-file/imm32
+<span id="L129" class="LineNr">129 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L130" class="LineNr">130 </span>    e8/call  read-byte/disp32
+<span id="L131" class="LineNr">131 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L132" class="LineNr">132 </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="L133" class="LineNr">133 </span>    <span class="subxComment"># check-ints-equal(EAX, 'A', msg)</span>
+<span id="L134" class="LineNr">134 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L135" class="LineNr">135 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-single&quot;</span>/imm32
+<span id="L136" class="LineNr">136 </span>    68/push  0x41/imm32
+<span id="L137" class="LineNr">137 </span>    50/push-EAX
+<span id="L138" class="LineNr">138 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L139" class="LineNr">139 </span>    e8/call  check-ints-equal/disp32
+<span id="L140" class="LineNr">140 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L141" class="LineNr">141 </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="L142" class="LineNr">142 </span>    <span class="subxS1Comment"># . end</span>
+<span id="L143" class="LineNr">143 </span>    c3/return
+<span id="L144" class="LineNr">144 </span>
+<span id="L145" class="LineNr">145 </span><span class="subxTest">test-read-byte-multiple</span>:
+<span id="L146" class="LineNr">146 </span>    <span class="subxH1Comment"># - call read-byte twice, check that second call returns second byte</span>
+<span id="L147" class="LineNr">147 </span>    <span class="subxComment"># setup</span>
+<span id="L148" class="LineNr">148 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
+<span id="L149" class="LineNr">149 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L150" class="LineNr">150 </span>    68/push  _test-stream/imm32
+<span id="L151" class="LineNr">151 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L152" class="LineNr">152 </span>    e8/call  clear-stream/disp32
+<span id="L153" class="LineNr">153 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L154" class="LineNr">154 </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="L155" class="LineNr">155 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
+<span id="L156" class="LineNr">156 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L157" class="LineNr">157 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L158" class="LineNr">158 </span>    05/add-to-EAX  4/imm32
+<span id="L159" class="LineNr">159 </span>    50/push-EAX
+<span id="L160" class="LineNr">160 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L161" class="LineNr">161 </span>    e8/call  clear-stream/disp32
+<span id="L162" class="LineNr">162 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L163" class="LineNr">163 </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="L164" class="LineNr">164 </span>    <span class="subxS1Comment"># . write(_test-stream, &quot;Ab&quot;)</span>
+<span id="L165" class="LineNr">165 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L166" class="LineNr">166 </span>    68/push  <span class="Constant">&quot;Ab&quot;</span>/imm32
+<span id="L167" class="LineNr">167 </span>    68/push  _test-stream/imm32
+<span id="L168" class="LineNr">168 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L169" class="LineNr">169 </span>    e8/call  write/disp32
+<span id="L170" class="LineNr">170 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L171" class="LineNr">171 </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="L172" class="LineNr">172 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
+<span id="L173" class="LineNr">173 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L174" class="LineNr">174 </span>    68/push  _test-buffered-file/imm32
+<span id="L175" class="LineNr">175 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L176" class="LineNr">176 </span>    e8/call  read-byte/disp32
+<span id="L177" class="LineNr">177 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L178" class="LineNr">178 </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="L179" class="LineNr">179 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
+<span id="L180" class="LineNr">180 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L181" class="LineNr">181 </span>    68/push  _test-buffered-file/imm32
+<span id="L182" class="LineNr">182 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L183" class="LineNr">183 </span>    e8/call  read-byte/disp32
+<span id="L184" class="LineNr">184 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L185" class="LineNr">185 </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="L186" class="LineNr">186 </span>    <span class="subxComment"># check-ints-equal(EAX, 'b', msg)</span>
+<span id="L187" class="LineNr">187 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L188" class="LineNr">188 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-multiple&quot;</span>/imm32
+<span id="L189" class="LineNr">189 </span>    68/push  0x62/imm32
+<span id="L190" class="LineNr">190 </span>    50/push-EAX
+<span id="L191" class="LineNr">191 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L192" class="LineNr">192 </span>    e8/call  check-ints-equal/disp32
+<span id="L193" class="LineNr">193 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L194" class="LineNr">194 </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="L195" class="LineNr">195 </span>    <span class="subxS1Comment"># . end</span>
+<span id="L196" class="LineNr">196 </span>    c3/return
+<span id="L197" class="LineNr">197 </span>
+<span id="L198" class="LineNr">198 </span><span class="subxTest">test-read-byte-end-of-file</span>:
+<span id="L199" class="LineNr">199 </span>    <span class="subxH1Comment"># - call read-byte on an empty 'file', check that it returns -1</span>
+<span id="L200" class="LineNr">200 </span>    <span class="subxComment"># setup</span>
+<span id="L201" class="LineNr">201 </span>    <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
+<span id="L202" class="LineNr">202 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L203" class="LineNr">203 </span>    68/push  _test-stream/imm32
+<span id="L204" class="LineNr">204 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L205" class="LineNr">205 </span>    e8/call  clear-stream/disp32
+<span id="L206" class="LineNr">206 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L207" class="LineNr">207 </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="L208" class="LineNr">208 </span>    <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
+<span id="L209" class="LineNr">209 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L210" class="LineNr">210 </span>    b8/copy-to-EAX  _test-buffered-file/imm32
+<span id="L211" class="LineNr">211 </span>    05/add-to-EAX  4/imm32
+<span id="L212" class="LineNr">212 </span>    50/push-EAX
+<span id="L213" class="LineNr">213 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L214" class="LineNr">214 </span>    e8/call  clear-stream/disp32
+<span id="L215" class="LineNr">215 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L216" class="LineNr">216 </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="L217" class="LineNr">217 </span>    <span class="subxComment"># read-byte(_test-buffered-file)</span>
+<span id="L218" class="LineNr">218 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L219" class="LineNr">219 </span>    68/push  _test-buffered-file/imm32
+<span id="L220" class="LineNr">220 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L221" class="LineNr">221 </span>    e8/call  read-byte/disp32
+<span id="L222" class="LineNr">222 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L223" class="LineNr">223 </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="L224" class="LineNr">224 </span>    <span class="subxComment"># check-ints-equal(EAX, -1, msg)</span>
+<span id="L225" class="LineNr">225 </span>    <span class="subxS2Comment"># . . push args</span>
+<span id="L226" class="LineNr">226 </span>    68/push  <span class="Constant">&quot;F - test-read-byte-end-of-file&quot;</span>/imm32
+<span id="L227" class="LineNr">227 </span>    68/push  -1/imm32
+<span id="L228" class="LineNr">228 </span>    50/push-EAX
+<span id="L229" class="LineNr">229 </span>    <span class="subxS2Comment"># . . call</span>
+<span id="L230" class="LineNr">230 </span>    e8/call  check-ints-equal/disp32
+<span id="L231" class="LineNr">231 </span>    <span class="subxS2Comment"># . . discard args</span>
+<span id="L232" class="LineNr">232 </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="L233" class="LineNr">233 </span>    <span class="subxS1Comment"># . end</span>
+<span id="L234" class="LineNr">234 </span>    c3/return
+<span id="L235" class="LineNr">235 </span>
+<span id="L236" class="LineNr">236 </span>== data
+<span id="L237" class="LineNr">237 </span>
+<span id="L238" class="LineNr">238 </span><span class="subxMinorFunction">_test-buffered-file</span>:
+<span id="L239" class="LineNr">239 </span>    <span class="subxComment"># file descriptor or (address stream)</span>
+<span id="L240" class="LineNr">240 </span>    _test-stream/imm32
+<span id="L241" class="LineNr">241 </span>    <span class="subxComment"># current write index</span>
+<span id="L242" class="LineNr">242 </span>    00 00 00 00
+<span id="L243" class="LineNr">243 </span>    <span class="subxComment"># current read index</span>
+<span id="L244" class="LineNr">244 </span>    00 00 00 00
+<span id="L245" class="LineNr">245 </span>    <span class="subxComment"># length (8)</span>
+<span id="L246" class="LineNr">246 </span>    08 00 00 00
+<span id="L247" class="LineNr">247 </span>    <span class="subxComment"># data</span>
+<span id="L248" class="LineNr">248 </span>    00 00 00 00 00 00 00 00  <span class="subxComment"># 8 bytes</span>
+<span id="L249" class="LineNr">249 </span>
+<span id="L250" class="LineNr">250 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
 </pre>
 </body>
 </html>
diff --git a/html/subx/examples/ex12.subx.html b/html/subx/examples/ex12.subx.html
index e2dfc4e0..39e13baa 100644
--- a/html/subx/examples/ex12.subx.html
+++ b/html/subx/examples/ex12.subx.html
@@ -79,10 +79,10 @@ if ('onhashchange' in window) {
 <span id="L17" class="LineNr">17 </span>    cd/syscall  0x80/imm8
 <span id="L18" class="LineNr">18 </span>
 <span id="L19" class="LineNr">19 </span>    <span class="subxComment"># write to *EAX to check that we have access to the newly-allocated segment</span>
-<span id="L20" class="LineNr">20 </span>    c7/copy                         0/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>              0x34/imm32              <span class="subxComment"># copy to *EAX</span>
+<span id="L20" class="LineNr">20 </span>    c7/copy                         0/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>              0x34/imm32        <span class="subxComment"># copy to *EAX</span>
 <span id="L21" class="LineNr">21 </span>
 <span id="L22" class="LineNr">22 </span>    <span class="subxComment"># syscall(exit, EAX)</span>
-<span id="L23" class="LineNr">23 </span>    89/copy                         3/mod/direct    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>
+<span id="L23" class="LineNr">23 </span>    89/copy                         3/mod/direct    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>
 <span id="L24" class="LineNr">24 </span>    b8/copy-to-EAX  1/imm32/exit
 <span id="L25" class="LineNr">25 </span>    cd/syscall  0x80/imm8
 <span id="L26" class="LineNr">26 </span>
diff --git a/html/subx/examples/ex7.subx.html b/html/subx/examples/ex7.subx.html
index f22f852f..ad52cf1c 100644
--- a/html/subx/examples/ex7.subx.html
+++ b/html/subx/examples/ex7.subx.html
@@ -91,12 +91,12 @@ if ('onhashchange' in window) {
 <span id="L30" class="LineNr"> 30 </span>    cd/syscall  0x80/imm8
 <span id="L31" class="LineNr"> 31 </span>    <span class="subxComment"># save stream</span>
 <span id="L32" class="LineNr"> 32 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L34" class="LineNr"> 34 </span>
 <span id="L35" class="LineNr"> 35 </span>    <span class="subxComment"># syscall(write, Stream, &quot;a&quot;, 1)</span>
 <span id="L36" class="LineNr"> 36 </span>    <span class="subxS1Comment"># . load stream</span>
 <span id="L37" class="LineNr"> 37 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L39" class="LineNr"> 39 </span>    <span class="subxS1Comment"># .</span>
 <span id="L40" class="LineNr"> 40 </span>    b9/copy-to-ECX  <span class="SpecialChar">A</span>/imm32
 <span id="L41" class="LineNr"> 41 </span>    ba/copy-to-EDX  1/imm32/size
@@ -106,7 +106,7 @@ if ('onhashchange' in window) {
 <span id="L45" class="LineNr"> 45 </span>    <span class="subxComment"># syscall(close, Stream)</span>
 <span id="L46" class="LineNr"> 46 </span>    <span class="subxS1Comment"># . load stream</span>
 <span id="L47" class="LineNr"> 47 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L49" class="LineNr"> 49 </span>    <span class="subxS1Comment"># .</span>
 <span id="L50" class="LineNr"> 50 </span>    b8/copy-to-EAX  6/imm32/close
 <span id="L51" class="LineNr"> 51 </span>    cd/syscall  0x80/imm8
@@ -119,12 +119,12 @@ if ('onhashchange' in window) {
 <span id="L58" class="LineNr"> 58 </span>    cd/syscall  0x80/imm8
 <span id="L59" class="LineNr"> 59 </span>    <span class="subxS1Comment"># . save Stream</span>
 <span id="L60" class="LineNr"> 60 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L62" class="LineNr"> 62 </span>
 <span id="L63" class="LineNr"> 63 </span>    <span class="subxComment"># syscall(read, Stream, B, 1)</span>
 <span id="L64" class="LineNr"> 64 </span>    <span class="subxS1Comment"># . load stream</span>
 <span id="L65" class="LineNr"> 65 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L67" class="LineNr"> 67 </span>    <span class="subxS1Comment"># .</span>
 <span id="L68" class="LineNr"> 68 </span>    b9/copy-to-ECX  <span class="SpecialChar">B</span>/imm32
 <span id="L69" class="LineNr"> 69 </span>    ba/copy-to-EDX  1/imm32/size
@@ -134,7 +134,7 @@ if ('onhashchange' in window) {
 <span id="L73" class="LineNr"> 73 </span>    <span class="subxComment"># syscall(close, Stream)</span>
 <span id="L74" class="LineNr"> 74 </span>    <span class="subxS1Comment"># . load stream</span>
 <span id="L75" class="LineNr"> 75 </span>    bb/copy-to-EBX  <span class="SpecialChar">Stream</span>/imm32
-<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>
+<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>
 <span id="L77" class="LineNr"> 77 </span>    <span class="subxComment">#</span>
 <span id="L78" class="LineNr"> 78 </span>    b8/copy-to-EAX  6/imm32/close
 <span id="L79" class="LineNr"> 79 </span>    cd/syscall  0x80/imm8
@@ -147,7 +147,7 @@ if ('onhashchange' in window) {
 <span id="L86" class="LineNr"> 86 </span>    <span class="subxComment"># syscall(exit, b)</span>
 <span id="L87" class="LineNr"> 87 </span>    <span class="subxS1Comment"># . load b</span>
 <span id="L88" class="LineNr"> 88 </span>    bb/copy-to-EBX  <span class="SpecialChar">B</span>/imm32
-<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>
+<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>
 <span id="L90" class="LineNr"> 90 </span>    <span class="subxComment">#</span>
 <span id="L91" class="LineNr"> 91 </span>    b8/copy-to-EAX  1/imm32/exit
 <span id="L92" class="LineNr"> 92 </span>    cd/syscall  0x80/imm8