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| author | Kartik Agaram <vc@akkartik.com> | 2018-11-30 09:43:49 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-11-30 09:43:49 -0800 |
| commit | c56d803cd8a0e3f28328f91aa1d457905a68641a (patch) | |
| tree | dd527a54c1ed8b45d5db44960f579c6faaf9ebd8 /html/subx/examples/ex10.subx.html | |
| parent | f989d6ccf9884e911db25494983da476f3c511b1 (diff) | |
| download | mu-c56d803cd8a0e3f28328f91aa1d457905a68641a.tar.gz | |
4796
Diffstat (limited to 'html/subx/examples/ex10.subx.html')
| -rw-r--r-- | html/subx/examples/ex10.subx.html | 98 |
1 files changed, 48 insertions, 50 deletions
diff --git a/html/subx/examples/ex10.subx.html b/html/subx/examples/ex10.subx.html index ed2d959b..5ab0f2a5 100644 --- a/html/subx/examples/ex10.subx.html +++ b/html/subx/examples/ex10.subx.html @@ -15,11 +15,9 @@ body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color a { color:#eeeeee; text-decoration: none; } a:hover { text-decoration: underline; } * { font-size: 12pt; font-size: 1em; } +.subxComment { color: #005fff; } .LineNr { color: #444444; } -.Delimiter { color: #800080; } -.Comment { color: #9090ff; } -.Comment a { color:#0000ee; text-decoration:underline; } -.SalientComment { color: #00ffff; } +.CommentedCode { color: #6c6c6c; } --> </style> @@ -54,78 +52,78 @@ if ('onhashchange' in window) { </head> <body onload='JumpToLine();'> <pre id='vimCodeElement'> -<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## String comparison: return 1 iff the two args passed in at the commandline are equal.</span> -<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span> -<span id="L3" class="LineNr"> 3 </span><span class="Comment"># To run (from the subx directory):</span> -<span id="L4" class="LineNr"> 4 </span><span class="Comment"># $ subx translate examples/ex10.subx -o examples/ex10</span> -<span id="L5" class="LineNr"> 5 </span><span class="Comment"># $ subx run examples/ex10 abc abd</span> -<span id="L6" class="LineNr"> 6 </span><span class="Comment"># Expected result:</span> -<span id="L7" class="LineNr"> 7 </span><span class="Comment"># $ echo $?</span> -<span id="L8" class="LineNr"> 8 </span><span class="Comment"># 0 # false</span> +<span id="L1" class="LineNr"> 1 </span><span class="subxComment">## String comparison: return 1 iff the two args passed in at the commandline are equal.</span> +<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> +<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run (from the subx directory):</span> +<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ subx translate examples/ex10.subx -o examples/ex10</span> +<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ subx run examples/ex10 abc abd</span> +<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span> +<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span> +<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 0 # false</span> <span id="L9" class="LineNr"> 9 </span> <span id="L10" class="LineNr">10 </span>== code -<span id="L11" class="LineNr">11 </span><span class="Comment"># instruction effective address operand displacement immediate</span> -<span id="L12" class="LineNr">12 </span><span class="Comment"># op subop mod rm32 base index scale r32</span> -<span id="L13" class="LineNr">13 </span><span class="Comment"># 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span> +<span id="L11" class="LineNr">11 </span><span class="subxComment"># instruction effective address operand displacement immediate</span> +<span id="L12" class="LineNr">12 </span><span class="subxComment"># op subop mod rm32 base index scale r32</span> +<span id="L13" class="LineNr">13 </span><span class="subxComment"># 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span> <span id="L14" class="LineNr">14 </span> -<span id="L15" class="LineNr">15 </span><span class="Comment"># main: return argv-equal(argv[1], argv[2])</span> -<span id="L16" class="LineNr">16 </span><span class="Comment"># At the start of a SubX program:</span> -<span id="L17" class="LineNr">17 </span><span class="Comment"># argc: *ESP</span> -<span id="L18" class="LineNr">18 </span><span class="Comment"># argv[0]: *(ESP+4)</span> -<span id="L19" class="LineNr">19 </span><span class="Comment"># argv[1]: *(ESP+8)</span> -<span id="L20" class="LineNr">20 </span><span class="Comment"># ...</span> -<span id="L21" class="LineNr">21 </span> <span class="Comment"># prolog</span> -<span id="L22" class="LineNr">22 </span> 89/copy 3/mod/direct 5/rm32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/r32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy ESP to EBP</span> -<span id="L23" class="LineNr">23 </span> <span class="Comment"># call argv-equal(argv[1], argv[2])</span> -<span id="L24" class="LineNr">24 </span> <span class="Comment"># push argv[2]</span> -<span id="L25" class="LineNr">25 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+12)</span> -<span id="L26" class="LineNr">26 </span> <span class="Comment"># push argv[1]</span> -<span id="L27" class="LineNr">27 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># push *(EBP+8)</span> -<span id="L28" class="LineNr">28 </span> <span class="Comment"># call</span> +<span id="L15" class="LineNr">15 </span><span class="subxComment"># main: return argv-equal(argv[1], argv[2])</span> +<span id="L16" class="LineNr">16 </span><span class="subxComment"># At the start of a SubX program:</span> +<span id="L17" class="LineNr">17 </span><span class="subxComment"># argc: *ESP</span> +<span id="L18" class="LineNr">18 </span><span class="subxComment"># argv[0]: *(ESP+4)</span> +<span id="L19" class="LineNr">19 </span><span class="subxComment"># argv[1]: *(ESP+8)</span> +<span id="L20" class="LineNr">20 </span><span class="subxComment"># ...</span> +<span id="L21" class="LineNr">21 </span> <span class="subxComment"># prolog</span> +<span id="L22" class="LineNr">22 </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="L23" class="LineNr">23 </span> <span class="subxComment"># call argv-equal(argv[1], argv[2])</span> +<span id="L24" class="LineNr">24 </span> <span class="subxComment"># push argv[2]</span> +<span id="L25" class="LineNr">25 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0xc/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># push *(EBP+12)</span> +<span id="L26" class="LineNr">26 </span> <span class="subxComment"># push argv[1]</span> +<span id="L27" class="LineNr">27 </span> ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0x8/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># push *(EBP+8)</span> +<span id="L28" class="LineNr">28 </span> <span class="subxComment"># call</span> <span id="L29" class="LineNr">29 </span> e8/call argv-equal/disp32 -<span id="L30" class="LineNr">30 </span> <span class="Comment"># exit(EAX)</span> +<span id="L30" class="LineNr">30 </span> <span class="subxComment"># exit(EAX)</span> <span id="L31" class="LineNr">31 </span>$exit: -<span id="L32" class="LineNr">32 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EAX to EBX</span> +<span id="L32" class="LineNr">32 </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="L33" class="LineNr">33 </span> b8/copy-to-EAX 1/imm32 <span id="L34" class="LineNr">34 </span> cd/syscall 0x80/imm8 <span id="L35" class="LineNr">35 </span> -<span id="L36" class="LineNr">36 </span><span class="Comment"># compare two null-terminated ascii strings</span> -<span id="L37" class="LineNr">37 </span><span class="Comment"># reason for the name: the only place we should have null-terminated ascii strings is from commandline args</span> -<span id="L38" class="LineNr">38 </span>argv-equal: <span class="Comment"># (s1, s2) : null-terminated ascii strings -> EAX : boolean</span> -<span id="L39" class="LineNr">39 </span> <span class="Comment"># initialize s1 (ECX) and s2 (EDX)</span> -<span id="L40" class="LineNr">40 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 1/r32/ECX 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+4) to ECX</span> -<span id="L41" class="LineNr">41 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 2/r32/EDX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+8) to EDX</span> -<span id="L42" class="LineNr">42 </span> <span class="Comment"># while (true)</span> +<span id="L36" class="LineNr">36 </span><span class="subxComment"># compare two null-terminated ascii strings</span> +<span id="L37" class="LineNr">37 </span><span class="subxComment"># reason for the name: the only place we should have null-terminated ascii strings is from commandline args</span> +<span id="L38" class="LineNr">38 </span>argv-equal: <span class="subxComment"># (s1, s2) : null-terminated ascii strings -> EAX : boolean</span> +<span id="L39" class="LineNr">39 </span> <span class="subxComment"># initialize s1 (ECX) and s2 (EDX)</span> +<span id="L40" class="LineNr">40 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="CommentedCode"> . </span> 1/r32/ECX 4/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy *(ESP+4) to ECX</span> +<span id="L41" class="LineNr">41 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="CommentedCode"> . </span> 2/r32/EDX 8/disp8 <span class="CommentedCode"> . </span> <span class="subxComment"># copy *(ESP+8) to EDX</span> +<span id="L42" class="LineNr">42 </span> <span class="subxComment"># while (true)</span> <span id="L43" class="LineNr">43 </span>$argv-equal:loop: -<span id="L44" class="LineNr">44 </span> <span class="Comment"># c1/EAX, c2/EBX = *s1, *s2</span> +<span id="L44" class="LineNr">44 </span> <span class="subxComment"># c1/EAX, c2/EBX = *s1, *s2</span> <span id="L45" class="LineNr">45 </span> b8/copy-to-EAX 0/imm32 -<span id="L46" class="LineNr">46 </span> 8a/copy 0/mod/indirect 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy byte at *ECX to lower byte of EAX</span> +<span id="L46" class="LineNr">46 </span> 8a/copy 0/mod/indirect 1/rm32/ECX <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 byte at *ECX to lower byte of EAX</span> <span id="L47" class="LineNr">47 </span> bb/copy-to-EBX 0/imm32 -<span id="L48" class="LineNr">48 </span> 8a/copy 0/mod/indirect 2/rm32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/r32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy byte at *EDX to lower byte of EBX</span> -<span id="L49" class="LineNr">49 </span> <span class="Comment"># if (c1 == 0) break</span> +<span id="L48" class="LineNr">48 </span> 8a/copy 0/mod/indirect 2/rm32/EDX <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 byte at *EDX to lower byte of EBX</span> +<span id="L49" class="LineNr">49 </span> <span class="subxComment"># if (c1 == 0) break</span> <span id="L50" class="LineNr">50 </span> 3d/compare-EAX 0/imm32 <span id="L51" class="LineNr">51 </span> 74/jump-if-equal $argv-equal:break/disp8 -<span id="L52" class="LineNr">52 </span> <span class="Comment"># if (c1 != c2) return false</span> -<span id="L53" class="LineNr">53 </span> 39/compare 3/mod/direct 0/rm32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/r32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># compare EAX with EBX</span> +<span id="L52" class="LineNr">52 </span> <span class="subxComment"># if (c1 != c2) return false</span> +<span id="L53" class="LineNr">53 </span> 39/compare 3/mod/direct 0/rm32/EAX <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"># compare EAX with EBX</span> <span id="L54" class="LineNr">54 </span> 75/jump-if-not-equal $argv-equal:false/disp8 -<span id="L55" class="LineNr">55 </span> <span class="Comment"># ++s1, ++s2</span> +<span id="L55" class="LineNr">55 </span> <span class="subxComment"># ++s1, ++s2</span> <span id="L56" class="LineNr">56 </span> 41/inc-ECX <span id="L57" class="LineNr">57 </span> 42/inc-EDX -<span id="L58" class="LineNr">58 </span> <span class="Comment"># end while</span> +<span id="L58" class="LineNr">58 </span> <span class="subxComment"># end while</span> <span id="L59" class="LineNr">59 </span> eb/jump $argv-equal:loop/disp8 <span id="L60" class="LineNr">60 </span>$argv-equal:break: -<span id="L61" class="LineNr">61 </span> <span class="Comment"># if (c2 == 0) return true</span> -<span id="L62" class="LineNr">62 </span> 81 7/subop/compare 3/mod/direct 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/imm32 <span class="Comment"># compare EBX</span> +<span id="L61" class="LineNr">61 </span> <span class="subxComment"># if (c2 == 0) return true</span> +<span id="L62" class="LineNr">62 </span> 81 7/subop/compare 3/mod/direct 3/rm32/EBX <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> <span class="CommentedCode"> . </span> 0/imm32 <span class="subxComment"># compare EBX</span> <span id="L63" class="LineNr">63 </span> 75/jump-if-not-equal $argv-equal:false/disp8 <span id="L64" class="LineNr">64 </span>$argv-equal:success: <span id="L65" class="LineNr">65 </span> b8/copy-to-EAX 1/imm32 <span id="L66" class="LineNr">66 </span> c3/return -<span id="L67" class="LineNr">67 </span> <span class="Comment"># return false</span> +<span id="L67" class="LineNr">67 </span> <span class="subxComment"># return false</span> <span id="L68" class="LineNr">68 </span>$argv-equal:false: <span id="L69" class="LineNr">69 </span> b8/copy-to-EAX 0/imm32 <span id="L70" class="LineNr">70 </span> c3/return <span id="L71" class="LineNr">71 </span> -<span id="L72" class="LineNr">72 </span><span class="Comment"># vim:nowrap:textwidth=0</span> +<span id="L72" class="LineNr">72 </span><span class="subxComment"># vim:nowrap:textwidth=0</span> </pre> </body> </html> |