diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-05-22 22:26:02 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-05-22 22:33:42 -0700 |
| commit | d1fa22f7b45378ddb6ce4eaf04f36f6c0bf0203c (patch) | |
| tree | 3ef25991f53b7990a6bf954efdabe89f2d8850bc | |
| parent | 40077d0d2b39ca5bed1f316e186b8f23b7148dc8 (diff) | |
| download | mu-d1fa22f7b45378ddb6ce4eaf04f36f6c0bf0203c.tar.gz | |
5221
Explore using a second register for pointer dereferencing.
| -rw-r--r-- | html/subx/apps/handle.subx.html | 356 | ||||
| -rw-r--r-- | subx/apps/handle.subx | 11 |
2 files changed, 195 insertions, 172 deletions
diff --git a/html/subx/apps/handle.subx.html b/html/subx/apps/handle.subx.html index 7e80e7e0..6b6adc69 100644 --- a/html/subx/apps/handle.subx.html +++ b/html/subx/apps/handle.subx.html @@ -23,6 +23,7 @@ a { color:inherit; } .subxTest { color: #5f8700; } .Constant { color: #008787; } .Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; } +.CommentedCode { color: #8a8a8a; } .subxH1Comment { color: #005faf; text-decoration: underline; } --> </style> @@ -120,13 +121,13 @@ if ('onhashchange' in window) { <span id="L59" class="LineNr"> 59 </span><span class="Constant">$new:continue</span>: <span id="L60" class="LineNr"> 60 </span> <span class="subxComment"># otherwise:</span> <span id="L61" class="LineNr"> 61 </span> <span class="subxComment"># ECX = *Next-alloc-id</span> -<span id="L62" class="LineNr"> 62 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ECX <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy *Next-alloc-id to ECX</span> +<span id="L62" class="LineNr"> 62 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ECX <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy *Next-alloc-id to ECX</span> <span id="L63" class="LineNr"> 63 </span> <span class="subxComment"># *EAX = *Next-alloc-id/ECX</span> <span id="L64" class="LineNr"> 64 </span> 89/copy 0/mod/indirect 0/rm32/EAX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ECX to *EAX</span> <span id="L65" class="LineNr"> 65 </span> <span class="subxComment"># out->alloc_id = *Next-alloc-id</span> <span id="L66" class="LineNr"> 66 </span> 89/copy 0/mod/indirect 2/rm32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ECX to *EDX</span> <span id="L67" class="LineNr"> 67 </span> <span class="subxComment"># increment *Next-alloc-id</span> -<span id="L68" class="LineNr"> 68 </span> ff 0/subop/increment 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># increment *Next-alloc-id</span> +<span id="L68" class="LineNr"> 68 </span> ff 0/subop/increment 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># increment *Next-alloc-id</span> <span id="L69" class="LineNr"> 69 </span><span class="Constant">$new:end</span>: <span id="L70" class="LineNr"> 70 </span> <span class="subxS1Comment"># . restore registers</span> <span id="L71" class="LineNr"> 71 </span> 5a/pop-to-EDX @@ -154,7 +155,7 @@ if ('onhashchange' in window) { <span id="L93" class="LineNr"> 93 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L94" class="LineNr"> 94 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> <span id="L95" class="LineNr"> 95 </span> <span class="subxComment"># *Next-alloc-id = 0x34</span> -<span id="L96" class="LineNr"> 96 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L96" class="LineNr"> 96 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L97" class="LineNr"> 97 </span> <span class="subxComment"># var handle/ECX = {0, 0}</span> <span id="L98" class="LineNr"> 98 </span> 68/push 0/imm32/address <span id="L99" class="LineNr"> 99 </span> 68/push 0/imm32/alloc-id @@ -191,14 +192,14 @@ if ('onhashchange' in window) { <span id="L130" class="LineNr">130 </span> <span class="subxS2Comment"># . . push args</span> <span id="L131" class="LineNr">131 </span> 68/push <span class="Constant">"F - <a href='handle.subx.html#L79'>test-new</a>: next alloc id"</span>/imm32 <span id="L132" class="LineNr">132 </span> 68/push 0x35/imm32 -<span id="L133" class="LineNr">133 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L133" class="LineNr">133 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L134" class="LineNr">134 </span> <span class="subxS2Comment"># . . call</span> <span id="L135" class="LineNr">135 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/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="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> <span id="L138" class="LineNr">138 </span> <span class="subxComment"># clean up</span> <span id="L139" class="LineNr">139 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> -<span id="L140" class="LineNr">140 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L140" class="LineNr">140 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L141" class="LineNr">141 </span> <span class="subxS1Comment"># . epilog</span> <span id="L142" class="LineNr">142 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> <span id="L143" class="LineNr">143 </span> 5d/pop-to-EBP @@ -209,7 +210,7 @@ if ('onhashchange' in window) { <span id="L148" class="LineNr">148 </span> 55/push-EBP <span id="L149" class="LineNr">149 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> <span id="L150" class="LineNr">150 </span> <span class="subxS1Comment"># . *Next-alloc-id = 0x34</span> -<span id="L151" class="LineNr">151 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L151" class="LineNr">151 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 0x34/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L152" class="LineNr">152 </span> <span class="subxComment"># define an allocation-descriptor with no space left</span> <span id="L153" class="LineNr">153 </span> <span class="subxS1Comment"># . var ad/EAX : (address allocation-descriptor) = {0x10, 0x10}</span> <span id="L154" class="LineNr">154 </span> 68/push 0x10/imm32/limit @@ -253,14 +254,14 @@ if ('onhashchange' in window) { <span id="L192" class="LineNr">192 </span> <span class="subxS2Comment"># . . push args</span> <span id="L193" class="LineNr">193 </span> 68/push <span class="Constant">"F - <a href='handle.subx.html#L146'>test-new-failure</a>: next alloc id"</span>/imm32 <span id="L194" class="LineNr">194 </span> 68/push 0x34/imm32 -<span id="L195" class="LineNr">195 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L195" class="LineNr">195 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L196" class="LineNr">196 </span> <span class="subxS2Comment"># . . call</span> <span id="L197" class="LineNr">197 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 <span id="L198" class="LineNr">198 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L199" class="LineNr">199 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> <span id="L200" class="LineNr">200 </span> <span class="subxComment"># clean up</span> <span id="L201" class="LineNr">201 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> -<span id="L202" class="LineNr">202 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L202" class="LineNr">202 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> <span id="L203" class="LineNr">203 </span> <span class="subxS1Comment"># . epilog</span> <span id="L204" class="LineNr">204 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> <span id="L205" class="LineNr">205 </span> 5d/pop-to-EBP @@ -292,174 +293,185 @@ if ('onhashchange' in window) { <span id="L231" class="LineNr">231 </span> <span class="subxComment"># add 4</span> <span id="L232" class="LineNr">232 </span> 05/add-to-EAX 4/imm32 <span id="L233" class="LineNr">233 </span> <span class="subxH1Comment"># - }</span> -<span id="L234" class="LineNr">234 </span> <span class="subxS1Comment"># . epilog</span> -<span id="L235" class="LineNr">235 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> -<span id="L236" class="LineNr">236 </span> 5d/pop-to-EBP -<span id="L237" class="LineNr">237 </span> c3/return -<span id="L238" class="LineNr">238 </span> -<span id="L239" class="LineNr">239 </span><span class="Constant">$lookup:abort</span>: -<span id="L240" class="LineNr">240 </span> <span class="subxS1Comment"># . _write(2/stderr, msg)</span> -<span id="L241" class="LineNr">241 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L242" class="LineNr">242 </span> 68/push <span class="Constant">"lookup failed\n"</span>/imm32 -<span id="L243" class="LineNr">243 </span> 68/push 2/imm32/stderr -<span id="L244" class="LineNr">244 </span> <span class="subxS2Comment"># . . call</span> -<span id="L245" class="LineNr">245 </span> e8/call <a href='../050_write.subx.html#L14'>_write</a>/disp32 -<span id="L246" class="LineNr">246 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L247" class="LineNr">247 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> -<span id="L248" class="LineNr">248 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span> -<span id="L249" class="LineNr">249 </span> bb/copy-to-EBX 1/imm32/exit-status -<span id="L250" class="LineNr">250 </span> b8/copy-to-EAX 1/imm32/exit -<span id="L251" class="LineNr">251 </span> cd/syscall 0x80/imm8 -<span id="L252" class="LineNr">252 </span> -<span id="L253" class="LineNr">253 </span><span class="subxTest">test-lookup-success</span>: -<span id="L254" class="LineNr">254 </span> <span class="subxS1Comment"># . prolog</span> -<span id="L255" class="LineNr">255 </span> 55/push-EBP -<span id="L256" class="LineNr">256 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> -<span id="L257" class="LineNr">257 </span> <span class="subxS1Comment"># . save registers</span> -<span id="L258" class="LineNr">258 </span> <span class="subxComment"># var heap/EBX : (address allocation-descriptor) = {0, 0}</span> -<span id="L259" class="LineNr">259 </span> 68/push 0/imm32/limit -<span id="L260" class="LineNr">260 </span> 68/push 0/imm32/curr -<span id="L261" class="LineNr">261 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBX</span> -<span id="L262" class="LineNr">262 </span> <span class="subxComment"># heap = new-segment(512)</span> -<span id="L263" class="LineNr">263 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L264" class="LineNr">264 </span> 53/push-EBX -<span id="L265" class="LineNr">265 </span> 68/push 0x200/imm32 -<span id="L266" class="LineNr">266 </span> <span class="subxS2Comment"># . . call</span> -<span id="L267" class="LineNr">267 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 -<span id="L268" class="LineNr">268 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L269" class="LineNr">269 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> -<span id="L270" class="LineNr">270 </span> <span class="subxComment"># var handle/ECX = {0, 0}</span> -<span id="L271" class="LineNr">271 </span> 68/push 0/imm32/address -<span id="L272" class="LineNr">272 </span> 68/push 0/imm32/alloc-id -<span id="L273" class="LineNr">273 </span> 89/copy 3/mod/direct 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ECX</span> -<span id="L274" class="LineNr">274 </span> <span class="subxComment"># var old_top/EDX = heap->curr</span> -<span id="L275" class="LineNr">275 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *EBX to EDX</span> -<span id="L276" class="LineNr">276 </span> <span class="subxComment"># new(heap, 2, handle)</span> -<span id="L277" class="LineNr">277 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L278" class="LineNr">278 </span> 51/push-ECX -<span id="L279" class="LineNr">279 </span> 68/push 2/imm32/size -<span id="L280" class="LineNr">280 </span> 53/push-EBX -<span id="L281" class="LineNr">281 </span> <span class="subxS2Comment"># . . call</span> -<span id="L282" class="LineNr">282 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 -<span id="L283" class="LineNr">283 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L284" class="LineNr">284 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> -<span id="L285" class="LineNr">285 </span> <span class="subxComment"># EAX = lookup(handle)</span> -<span id="L286" class="LineNr">286 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L287" class="LineNr">287 </span> 51/push-ECX -<span id="L288" class="LineNr">288 </span> <span class="subxS2Comment"># . . call</span> -<span id="L289" class="LineNr">289 </span> e8/call <a href='handle.subx.html#L208'>lookup</a>/disp32 -<span id="L290" class="LineNr">290 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L291" class="LineNr">291 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> -<span id="L292" class="LineNr">292 </span> <span class="subxComment"># EAX contains old top of heap, except skipping the alloc id in the payload</span> -<span id="L293" class="LineNr">293 </span> <span class="subxS1Comment"># . check-ints-equal(EAX, old_top+4, msg)</span> -<span id="L294" class="LineNr">294 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L295" class="LineNr">295 </span> 68/push <span class="Constant">"F - test-lookup-success"</span>/imm32 -<span id="L296" class="LineNr">296 </span> 81 0/subop/add 3/mod/direct 2/rm32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to EDX</span> -<span id="L297" class="LineNr">297 </span> 52/push-EDX -<span id="L298" class="LineNr">298 </span> 50/push-EAX +<span id="L234" class="LineNr">234 </span> <span class="subxH1Comment"># - alternative consuming a second register {</span> +<span id="L235" class="LineNr">235 </span><span class="CommentedCode">#? # ECX = handle->alloc_id</span> +<span id="L236" class="LineNr">236 </span><span class="CommentedCode">#? 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX</span> +<span id="L237" class="LineNr">237 </span><span class="CommentedCode">#? # EAX = handle->address (payload)</span> +<span id="L238" class="LineNr">238 </span><span class="CommentedCode">#? 8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 0/r32/EAX 4/disp8 . # copy *(EAX+4) to EAX</span> +<span id="L239" class="LineNr">239 </span><span class="CommentedCode">#? # if (ECX != *EAX) abort</span> +<span id="L240" class="LineNr">240 </span><span class="CommentedCode">#? 39/compare 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # compare *EAX and ECX</span> +<span id="L241" class="LineNr">241 </span><span class="CommentedCode">#? 75/jump-if-not-equal $lookup:abort/disp8</span> +<span id="L242" class="LineNr">242 </span><span class="CommentedCode">#? # add 4 to EAX</span> +<span id="L243" class="LineNr">243 </span><span class="CommentedCode">#? 05/add-to-EAX 4/imm32</span> +<span id="L244" class="LineNr">244 </span> <span class="subxH1Comment"># - }</span> +<span id="L245" class="LineNr">245 </span> <span class="subxS1Comment"># . epilog</span> +<span id="L246" class="LineNr">246 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> +<span id="L247" class="LineNr">247 </span> 5d/pop-to-EBP +<span id="L248" class="LineNr">248 </span> c3/return +<span id="L249" class="LineNr">249 </span> +<span id="L250" class="LineNr">250 </span><span class="Constant">$lookup:abort</span>: +<span id="L251" class="LineNr">251 </span> <span class="subxS1Comment"># . _write(2/stderr, msg)</span> +<span id="L252" class="LineNr">252 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L253" class="LineNr">253 </span> 68/push <span class="Constant">"lookup failed\n"</span>/imm32 +<span id="L254" class="LineNr">254 </span> 68/push 2/imm32/stderr +<span id="L255" class="LineNr">255 </span> <span class="subxS2Comment"># . . call</span> +<span id="L256" class="LineNr">256 </span> e8/call <a href='../050_write.subx.html#L14'>_write</a>/disp32 +<span id="L257" class="LineNr">257 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L258" class="LineNr">258 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> +<span id="L259" class="LineNr">259 </span> <span class="subxS1Comment"># . syscall(exit, 1)</span> +<span id="L260" class="LineNr">260 </span> bb/copy-to-EBX 1/imm32/exit-status +<span id="L261" class="LineNr">261 </span> b8/copy-to-EAX 1/imm32/exit +<span id="L262" class="LineNr">262 </span> cd/syscall 0x80/imm8 +<span id="L263" class="LineNr">263 </span> +<span id="L264" class="LineNr">264 </span><span class="subxTest">test-lookup-success</span>: +<span id="L265" class="LineNr">265 </span> <span class="subxS1Comment"># . prolog</span> +<span id="L266" class="LineNr">266 </span> 55/push-EBP +<span id="L267" class="LineNr">267 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> +<span id="L268" class="LineNr">268 </span> <span class="subxS1Comment"># . save registers</span> +<span id="L269" class="LineNr">269 </span> <span class="subxComment"># var heap/EBX : (address allocation-descriptor) = {0, 0}</span> +<span id="L270" class="LineNr">270 </span> 68/push 0/imm32/limit +<span id="L271" class="LineNr">271 </span> 68/push 0/imm32/curr +<span id="L272" class="LineNr">272 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBX</span> +<span id="L273" class="LineNr">273 </span> <span class="subxComment"># heap = new-segment(512)</span> +<span id="L274" class="LineNr">274 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L275" class="LineNr">275 </span> 53/push-EBX +<span id="L276" class="LineNr">276 </span> 68/push 0x200/imm32 +<span id="L277" class="LineNr">277 </span> <span class="subxS2Comment"># . . call</span> +<span id="L278" class="LineNr">278 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 +<span id="L279" class="LineNr">279 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L280" class="LineNr">280 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> +<span id="L281" class="LineNr">281 </span> <span class="subxComment"># var handle/ECX = {0, 0}</span> +<span id="L282" class="LineNr">282 </span> 68/push 0/imm32/address +<span id="L283" class="LineNr">283 </span> 68/push 0/imm32/alloc-id +<span id="L284" class="LineNr">284 </span> 89/copy 3/mod/direct 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ECX</span> +<span id="L285" class="LineNr">285 </span> <span class="subxComment"># var old_top/EDX = heap->curr</span> +<span id="L286" class="LineNr">286 </span> 8b/copy 0/mod/indirect 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 2/r32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *EBX to EDX</span> +<span id="L287" class="LineNr">287 </span> <span class="subxComment"># new(heap, 2, handle)</span> +<span id="L288" class="LineNr">288 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L289" class="LineNr">289 </span> 51/push-ECX +<span id="L290" class="LineNr">290 </span> 68/push 2/imm32/size +<span id="L291" class="LineNr">291 </span> 53/push-EBX +<span id="L292" class="LineNr">292 </span> <span class="subxS2Comment"># . . call</span> +<span id="L293" class="LineNr">293 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 +<span id="L294" class="LineNr">294 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L295" class="LineNr">295 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> +<span id="L296" class="LineNr">296 </span> <span class="subxComment"># EAX = lookup(handle)</span> +<span id="L297" class="LineNr">297 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L298" class="LineNr">298 </span> 51/push-ECX <span id="L299" class="LineNr">299 </span> <span class="subxS2Comment"># . . call</span> -<span id="L300" class="LineNr">300 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 +<span id="L300" class="LineNr">300 </span> e8/call <a href='handle.subx.html#L208'>lookup</a>/disp32 <span id="L301" class="LineNr">301 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L302" class="LineNr">302 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> -<span id="L303" class="LineNr">303 </span> <span class="subxComment"># clean up</span> -<span id="L304" class="LineNr">304 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> -<span id="L305" class="LineNr">305 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> -<span id="L306" class="LineNr">306 </span> <span class="subxComment"># write(2/stderr, "lookup succeeded\n")</span> -<span id="L307" class="LineNr">307 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L308" class="LineNr">308 </span> 68/push <span class="Constant">"lookup succeeded\n"</span>/imm32 -<span id="L309" class="LineNr">309 </span> 68/push 2/imm32/stderr +<span id="L302" class="LineNr">302 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> +<span id="L303" class="LineNr">303 </span> <span class="subxComment"># EAX contains old top of heap, except skipping the alloc id in the payload</span> +<span id="L304" class="LineNr">304 </span> <span class="subxS1Comment"># . check-ints-equal(EAX, old_top+4, msg)</span> +<span id="L305" class="LineNr">305 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L306" class="LineNr">306 </span> 68/push <span class="Constant">"F - test-lookup-success"</span>/imm32 +<span id="L307" class="LineNr">307 </span> 81 0/subop/add 3/mod/direct 2/rm32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to EDX</span> +<span id="L308" class="LineNr">308 </span> 52/push-EDX +<span id="L309" class="LineNr">309 </span> 50/push-EAX <span id="L310" class="LineNr">310 </span> <span class="subxS2Comment"># . . call</span> -<span id="L311" class="LineNr">311 </span> e8/call <a href='../057write.subx.html#L24'>write</a>/disp32 +<span id="L311" class="LineNr">311 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 <span id="L312" class="LineNr">312 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L313" class="LineNr">313 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> -<span id="L314" class="LineNr">314 </span> <span class="subxS1Comment"># . restore registers</span> -<span id="L315" class="LineNr">315 </span> 5a/pop-to-EDX -<span id="L316" class="LineNr">316 </span> 59/pop-to-ECX -<span id="L317" class="LineNr">317 </span> <span class="subxS1Comment"># . epilog</span> -<span id="L318" class="LineNr">318 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> -<span id="L319" class="LineNr">319 </span> 5d/pop-to-EBP -<span id="L320" class="LineNr">320 </span> c3/return -<span id="L321" class="LineNr">321 </span> -<span id="L322" class="LineNr">322 </span><span class="subxTest">test-lookup-failure</span>: -<span id="L323" class="LineNr">323 </span> <span class="subxS1Comment"># . prolog</span> -<span id="L324" class="LineNr">324 </span> 55/push-EBP -<span id="L325" class="LineNr">325 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> -<span id="L326" class="LineNr">326 </span> <span class="subxComment"># var heap/ESI : (address allocation-descriptor) = {0, 0}</span> -<span id="L327" class="LineNr">327 </span> 68/push 0/imm32/limit -<span id="L328" class="LineNr">328 </span> 68/push 0/imm32/curr -<span id="L329" class="LineNr">329 </span> 89/copy 3/mod/direct 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ESI</span> -<span id="L330" class="LineNr">330 </span> <span class="subxComment"># heap = new-segment(512)</span> -<span id="L331" class="LineNr">331 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L332" class="LineNr">332 </span> 56/push-ESI -<span id="L333" class="LineNr">333 </span> 68/push 0x200/imm32 -<span id="L334" class="LineNr">334 </span> <span class="subxS2Comment"># . . call</span> -<span id="L335" class="LineNr">335 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 -<span id="L336" class="LineNr">336 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L337" class="LineNr">337 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> -<span id="L338" class="LineNr">338 </span> <span class="subxComment"># var h1/ECX = {0, 0}</span> -<span id="L339" class="LineNr">339 </span> 68/push 0/imm32/address -<span id="L340" class="LineNr">340 </span> 68/push 0/imm32/alloc-id -<span id="L341" class="LineNr">341 </span> 89/copy 3/mod/direct 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ECX</span> -<span id="L342" class="LineNr">342 </span> <span class="subxComment"># var old_top/EBX = heap->curr</span> -<span id="L343" class="LineNr">343 </span> 8b/copy 0/mod/indirect 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *ESI to EBX</span> -<span id="L344" class="LineNr">344 </span> <span class="subxComment"># first allocation, to h1</span> -<span id="L345" class="LineNr">345 </span> <span class="subxS1Comment"># . new(heap, 2, h1)</span> -<span id="L346" class="LineNr">346 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L347" class="LineNr">347 </span> 51/push-ECX -<span id="L348" class="LineNr">348 </span> 68/push 2/imm32/size -<span id="L349" class="LineNr">349 </span> 56/push-ESI -<span id="L350" class="LineNr">350 </span> <span class="subxS2Comment"># . . call</span> -<span id="L351" class="LineNr">351 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 -<span id="L352" class="LineNr">352 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L353" class="LineNr">353 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> -<span id="L354" class="LineNr">354 </span> <span class="subxComment"># reset heap->curr to mimic reclamation</span> -<span id="L355" class="LineNr">355 </span> 89/copy 0/mod/indirect 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBX to *ESI</span> -<span id="L356" class="LineNr">356 </span> <span class="subxComment"># second allocation that returns the same address as the first</span> -<span id="L357" class="LineNr">357 </span> <span class="subxComment"># var h2/EDX = {0, 0}</span> -<span id="L358" class="LineNr">358 </span> 68/push 0/imm32/address -<span id="L359" class="LineNr">359 </span> 68/push 0/imm32/alloc-id -<span id="L360" class="LineNr">360 </span> 89/copy 3/mod/direct 2/rm32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EDX</span> -<span id="L361" class="LineNr">361 </span> <span class="subxS1Comment"># . new(heap, 2, h2)</span> -<span id="L362" class="LineNr">362 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L363" class="LineNr">363 </span> 52/push-EDX -<span id="L364" class="LineNr">364 </span> 68/push 2/imm32/size -<span id="L365" class="LineNr">365 </span> 56/push-ESI -<span id="L366" class="LineNr">366 </span> <span class="subxS2Comment"># . . call</span> -<span id="L367" class="LineNr">367 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 -<span id="L368" class="LineNr">368 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L369" class="LineNr">369 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> -<span id="L370" class="LineNr">370 </span> <span class="subxComment"># check-ints-equal(h1->address, h2->address, msg)</span> -<span id="L371" class="LineNr">371 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L372" class="LineNr">372 </span> 68/push <span class="Constant">"F - test-lookup-failure"</span>/imm32 -<span id="L373" class="LineNr">373 </span> ff 6/subop/push 1/mod/*+disp8 2/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(EDX+4)</span> -<span id="L374" class="LineNr">374 </span> ff 6/subop/push 1/mod/*+disp8 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ECX+4)</span> -<span id="L375" class="LineNr">375 </span> <span class="subxS2Comment"># . . call</span> -<span id="L376" class="LineNr">376 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 -<span id="L377" class="LineNr">377 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L378" class="LineNr">378 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> -<span id="L379" class="LineNr">379 </span> <span class="subxComment"># lookup(h1) should crash</span> -<span id="L380" class="LineNr">380 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L381" class="LineNr">381 </span> 51/push-ECX -<span id="L382" class="LineNr">382 </span> <span class="subxS2Comment"># . . call</span> -<span id="L383" class="LineNr">383 </span> e8/call <a href='handle.subx.html#L208'>lookup</a>/disp32 -<span id="L384" class="LineNr">384 </span> <span class="subxComment"># should never get past this point</span> -<span id="L385" class="LineNr">385 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L386" class="LineNr">386 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> -<span id="L387" class="LineNr">387 </span> <span class="subxComment"># clean up</span> -<span id="L388" class="LineNr">388 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> -<span id="L389" class="LineNr">389 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L398'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> -<span id="L390" class="LineNr">390 </span> <span class="subxS1Comment"># . epilog</span> -<span id="L391" class="LineNr">391 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> -<span id="L392" class="LineNr">392 </span> 5d/pop-to-EBP -<span id="L393" class="LineNr">393 </span> c3/return -<span id="L394" class="LineNr">394 </span> -<span id="L395" class="LineNr">395 </span>== data -<span id="L396" class="LineNr">396 </span> -<span id="L397" class="LineNr">397 </span><span class="subxComment"># Monotonically increasing counter for calls to 'new'</span> -<span id="L398" class="LineNr">398 </span><span class="SpecialChar">Next-alloc-id</span>: -<span id="L399" class="LineNr">399 </span> 1/imm32 -<span id="L400" class="LineNr">400 </span> -<span id="L401" class="LineNr">401 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> +<span id="L313" class="LineNr">313 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> +<span id="L314" class="LineNr">314 </span> <span class="subxComment"># clean up</span> +<span id="L315" class="LineNr">315 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> +<span id="L316" class="LineNr">316 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L317" class="LineNr">317 </span> <span class="subxComment"># write(2/stderr, "lookup succeeded\n")</span> +<span id="L318" class="LineNr">318 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L319" class="LineNr">319 </span> 68/push <span class="Constant">"lookup succeeded\n"</span>/imm32 +<span id="L320" class="LineNr">320 </span> 68/push 2/imm32/stderr +<span id="L321" class="LineNr">321 </span> <span class="subxS2Comment"># . . call</span> +<span id="L322" class="LineNr">322 </span> e8/call <a href='../057write.subx.html#L24'>write</a>/disp32 +<span id="L323" class="LineNr">323 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L324" class="LineNr">324 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> +<span id="L325" class="LineNr">325 </span> <span class="subxS1Comment"># . restore registers</span> +<span id="L326" class="LineNr">326 </span> 5a/pop-to-EDX +<span id="L327" class="LineNr">327 </span> 59/pop-to-ECX +<span id="L328" class="LineNr">328 </span> <span class="subxS1Comment"># . epilog</span> +<span id="L329" class="LineNr">329 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> +<span id="L330" class="LineNr">330 </span> 5d/pop-to-EBP +<span id="L331" class="LineNr">331 </span> c3/return +<span id="L332" class="LineNr">332 </span> +<span id="L333" class="LineNr">333 </span><span class="subxTest">test-lookup-failure</span>: +<span id="L334" class="LineNr">334 </span> <span class="subxS1Comment"># . prolog</span> +<span id="L335" class="LineNr">335 </span> 55/push-EBP +<span id="L336" class="LineNr">336 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EBP</span> +<span id="L337" class="LineNr">337 </span> <span class="subxComment"># var heap/ESI : (address allocation-descriptor) = {0, 0}</span> +<span id="L338" class="LineNr">338 </span> 68/push 0/imm32/limit +<span id="L339" class="LineNr">339 </span> 68/push 0/imm32/curr +<span id="L340" class="LineNr">340 </span> 89/copy 3/mod/direct 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ESI</span> +<span id="L341" class="LineNr">341 </span> <span class="subxComment"># heap = new-segment(512)</span> +<span id="L342" class="LineNr">342 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L343" class="LineNr">343 </span> 56/push-ESI +<span id="L344" class="LineNr">344 </span> 68/push 0x200/imm32 +<span id="L345" class="LineNr">345 </span> <span class="subxS2Comment"># . . call</span> +<span id="L346" class="LineNr">346 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 +<span id="L347" class="LineNr">347 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L348" class="LineNr">348 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/imm32 <span class="subxComment"># add to ESP</span> +<span id="L349" class="LineNr">349 </span> <span class="subxComment"># var h1/ECX = {0, 0}</span> +<span id="L350" class="LineNr">350 </span> 68/push 0/imm32/address +<span id="L351" class="LineNr">351 </span> 68/push 0/imm32/alloc-id +<span id="L352" class="LineNr">352 </span> 89/copy 3/mod/direct 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to ECX</span> +<span id="L353" class="LineNr">353 </span> <span class="subxComment"># var old_top/EBX = heap->curr</span> +<span id="L354" class="LineNr">354 </span> 8b/copy 0/mod/indirect 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy *ESI to EBX</span> +<span id="L355" class="LineNr">355 </span> <span class="subxComment"># first allocation, to h1</span> +<span id="L356" class="LineNr">356 </span> <span class="subxS1Comment"># . new(heap, 2, h1)</span> +<span id="L357" class="LineNr">357 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L358" class="LineNr">358 </span> 51/push-ECX +<span id="L359" class="LineNr">359 </span> 68/push 2/imm32/size +<span id="L360" class="LineNr">360 </span> 56/push-ESI +<span id="L361" class="LineNr">361 </span> <span class="subxS2Comment"># . . call</span> +<span id="L362" class="LineNr">362 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 +<span id="L363" class="LineNr">363 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L364" class="LineNr">364 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> +<span id="L365" class="LineNr">365 </span> <span class="subxComment"># reset heap->curr to mimic reclamation</span> +<span id="L366" class="LineNr">366 </span> 89/copy 0/mod/indirect 6/rm32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBX to *ESI</span> +<span id="L367" class="LineNr">367 </span> <span class="subxComment"># second allocation that returns the same address as the first</span> +<span id="L368" class="LineNr">368 </span> <span class="subxComment"># var h2/EDX = {0, 0}</span> +<span id="L369" class="LineNr">369 </span> 68/push 0/imm32/address +<span id="L370" class="LineNr">370 </span> 68/push 0/imm32/alloc-id +<span id="L371" class="LineNr">371 </span> 89/copy 3/mod/direct 2/rm32/EDX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESP to EDX</span> +<span id="L372" class="LineNr">372 </span> <span class="subxS1Comment"># . new(heap, 2, h2)</span> +<span id="L373" class="LineNr">373 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L374" class="LineNr">374 </span> 52/push-EDX +<span id="L375" class="LineNr">375 </span> 68/push 2/imm32/size +<span id="L376" class="LineNr">376 </span> 56/push-ESI +<span id="L377" class="LineNr">377 </span> <span class="subxS2Comment"># . . call</span> +<span id="L378" class="LineNr">378 </span> e8/call <a href='handle.subx.html#L31'>new</a>/disp32 +<span id="L379" class="LineNr">379 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L380" class="LineNr">380 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> +<span id="L381" class="LineNr">381 </span> <span class="subxComment"># check-ints-equal(h1->address, h2->address, msg)</span> +<span id="L382" class="LineNr">382 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L383" class="LineNr">383 </span> 68/push <span class="Constant">"F - test-lookup-failure"</span>/imm32 +<span id="L384" class="LineNr">384 </span> ff 6/subop/push 1/mod/*+disp8 2/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(EDX+4)</span> +<span id="L385" class="LineNr">385 </span> ff 6/subop/push 1/mod/*+disp8 1/rm32/ECX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ECX+4)</span> +<span id="L386" class="LineNr">386 </span> <span class="subxS2Comment"># . . call</span> +<span id="L387" class="LineNr">387 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 +<span id="L388" class="LineNr">388 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L389" class="LineNr">389 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/imm32 <span class="subxComment"># add to ESP</span> +<span id="L390" class="LineNr">390 </span> <span class="subxComment"># lookup(h1) should crash</span> +<span id="L391" class="LineNr">391 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L392" class="LineNr">392 </span> 51/push-ECX +<span id="L393" class="LineNr">393 </span> <span class="subxS2Comment"># . . call</span> +<span id="L394" class="LineNr">394 </span> e8/call <a href='handle.subx.html#L208'>lookup</a>/disp32 +<span id="L395" class="LineNr">395 </span> <span class="subxComment"># should never get past this point</span> +<span id="L396" class="LineNr">396 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L397" class="LineNr">397 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to ESP</span> +<span id="L398" class="LineNr">398 </span> <span class="subxComment"># clean up</span> +<span id="L399" class="LineNr">399 </span> <span class="subxS1Comment"># . *Next-alloc-id = 1</span> +<span id="L400" class="LineNr">400 </span> c7 0/subop/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='handle.subx.html#L409'>Next-alloc-id</a></span>/disp32 1/imm32 <span class="subxComment"># copy to *Next-alloc-id</span> +<span id="L401" class="LineNr">401 </span> <span class="subxS1Comment"># . epilog</span> +<span id="L402" class="LineNr">402 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy EBP to ESP</span> +<span id="L403" class="LineNr">403 </span> 5d/pop-to-EBP +<span id="L404" class="LineNr">404 </span> c3/return +<span id="L405" class="LineNr">405 </span> +<span id="L406" class="LineNr">406 </span>== data +<span id="L407" class="LineNr">407 </span> +<span id="L408" class="LineNr">408 </span><span class="subxComment"># Monotonically increasing counter for calls to 'new'</span> +<span id="L409" class="LineNr">409 </span><span class="SpecialChar">Next-alloc-id</span>: +<span id="L410" class="LineNr">410 </span> 1/imm32 +<span id="L411" class="LineNr">411 </span> +<span id="L412" class="LineNr">412 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> </pre> </body> </html> diff --git a/subx/apps/handle.subx b/subx/apps/handle.subx index 60b4021a..97a6c622 100644 --- a/subx/apps/handle.subx +++ b/subx/apps/handle.subx @@ -231,6 +231,17 @@ lookup: # h : (handle T) -> EAX : (address T) # add 4 05/add-to-EAX 4/imm32 # - } + # - alternative consuming a second register { +#? # ECX = handle->alloc_id +#? 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX +#? # EAX = handle->address (payload) +#? 8b/copy 1/mod/*+disp8 0/rm32/EAX . . . 0/r32/EAX 4/disp8 . # copy *(EAX+4) to EAX +#? # if (ECX != *EAX) abort +#? 39/compare 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # compare *EAX and ECX +#? 75/jump-if-not-equal $lookup:abort/disp8 +#? # add 4 to EAX +#? 05/add-to-EAX 4/imm32 + # - } # . epilog 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP 5d/pop-to-EBP |