diff options
Diffstat (limited to 'html/subx/apps/factorial.subx.html')
| -rw-r--r-- | html/subx/apps/factorial.subx.html | 189 |
1 files changed, 45 insertions, 144 deletions
diff --git a/html/subx/apps/factorial.subx.html b/html/subx/apps/factorial.subx.html index 4e11b12f..cbb66b9e 100644 --- a/html/subx/apps/factorial.subx.html +++ b/html/subx/apps/factorial.subx.html @@ -17,7 +17,6 @@ a:hover { text-decoration: underline; } * { font-size: 12pt; font-size: 1em; } .LineNr { color: #444444; } .Delimiter { color: #800080; } -.Folded { color: #a8a8a8; background-color: #080808; padding-bottom: 1px; } .Comment { color: #9090ff; } .Comment a { color:#0000ee; text-decoration:underline; } .SalientComment { color: #00ffff; } @@ -57,8 +56,8 @@ if ('onhashchange' in window) { <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## compute the factorial of 5, and return the result in the exit code</span> <span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span> -<span id="L3" class="LineNr"> 3 </span><span class="Comment"># To run:</span> -<span id="L4" class="LineNr"> 4 </span><span class="Comment"># $ subx translate apps/factorial.subx apps/factorial</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 apps/factorial.subx -o apps/factorial</span> <span id="L5" class="LineNr"> 5 </span><span class="Comment"># $ subx run apps/factorial</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> @@ -77,21 +76,21 @@ if ('onhashchange' in window) { <span id="L20" class="LineNr"> 20 </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="L21" class="LineNr"> 21 </span> <span id="L22" class="LineNr"> 22 </span><span class="Comment"># main:</span> -<span id="L23" class="LineNr"> 23 </span> <span class="Comment"># if (argc > 1)</span> -<span id="L24" class="LineNr"> 24 </span> 8b/copy 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *ESP to EAX</span> -<span id="L25" class="LineNr"> 25 </span> 3d/compare <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># compare EAX with 1</span> -<span id="L26" class="LineNr"> 26 </span> 7e/jump-if-lesser-or-equal $run_main/disp8 -<span id="L27" class="LineNr"> 27 </span> <span class="Comment"># and if (argv[1] == "test")</span> -<span id="L28" class="LineNr"> 28 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+8) to EAX</span> +<span id="L23" class="LineNr"> 23 </span> <span class="Comment"># prolog</span> +<span id="L24" class="LineNr"> 24 </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="L25" class="LineNr"> 25 </span> <span class="Comment"># if (argc > 1)</span> +<span id="L26" class="LineNr"> 26 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/SIB 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/disp8 1/imm32 <span class="Comment"># compare *EBP</span> +<span id="L27" class="LineNr"> 27 </span> 7e/jump-if-lesser-or-equal $run_main/disp8 +<span id="L28" class="LineNr"> 28 </span> <span class="Comment"># and if (argv[1] == "test")</span> <span id="L29" class="LineNr"> 29 </span> <span class="Comment"># push args</span> -<span id="L30" class="LineNr"> 30 </span> 50/push-EAX -<span id="L31" class="LineNr"> 31 </span> 68/push "test"/imm32 +<span id="L30" class="LineNr"> 30 </span> 68/push "test"/imm32 +<span id="L31" class="LineNr"> 31 </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="L32" class="LineNr"> 32 </span> <span class="Comment"># call</span> -<span id="L33" class="LineNr"> 33 </span> e8/call argv_equal/disp32 +<span id="L33" class="LineNr"> 33 </span> e8/call kernel_string_equal/disp32 <span id="L34" class="LineNr"> 34 </span> <span class="Comment"># discard args</span> -<span id="L35" class="LineNr"> 35 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add 8 to ESP</span> +<span id="L35" class="LineNr"> 35 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32 <span class="Comment"># add to ESP</span> <span id="L36" class="LineNr"> 36 </span> <span class="Comment"># check result</span> -<span id="L37" class="LineNr"> 37 </span> 3d/compare <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># compare EAX with 1</span> +<span id="L37" class="LineNr"> 37 </span> 3d/compare-EAX 1/imm32 <span id="L38" class="LineNr"> 38 </span> 75/jump-if-not-equal $run_main/disp8 <span id="L39" class="LineNr"> 39 </span> <span class="Comment"># then</span> <span id="L40" class="LineNr"> 40 </span> e8/call run_tests/disp32 @@ -103,40 +102,40 @@ if ('onhashchange' in window) { <span id="L46" class="LineNr"> 46 </span> <span class="Comment"># EAX <- call</span> <span id="L47" class="LineNr"> 47 </span> e8/call factorial/disp32 <span id="L48" class="LineNr"> 48 </span> <span class="Comment"># discard arg</span> -<span id="L49" class="LineNr"> 49 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> +<span id="L49" class="LineNr"> 49 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span> <span id="L50" class="LineNr"> 50 </span>$main_exit: <span id="L51" class="LineNr"> 51 </span> <span class="Comment"># exit(EAX)</span> <span id="L52" class="LineNr"> 52 </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="L53" class="LineNr"> 53 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy 1 to EAX</span> +<span id="L53" class="LineNr"> 53 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy to EAX</span> <span id="L54" class="LineNr"> 54 </span> cd/syscall 0x80/imm8 <span id="L55" class="LineNr"> 55 </span> <span id="L56" class="LineNr"> 56 </span><span class="Comment"># factorial(n)</span> <span id="L57" class="LineNr"> 57 </span>factorial: -<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># initialize EAX to 1 (base case)</span> -<span id="L59" class="LineNr"> 59 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy 1 to EAX</span> -<span id="L60" class="LineNr"> 60 </span> <span class="Comment"># if (n <= 1) jump exit</span> -<span id="L61" class="LineNr"> 61 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/disp8 1/imm32 <span class="Comment"># compare *(ESP+4) with 1</span> -<span id="L62" class="LineNr"> 62 </span> 7e/jump-if-<= $factorial:exit/disp8 -<span id="L63" class="LineNr"> 63 </span> <span class="Comment"># EBX: n-1</span> -<span id="L64" class="LineNr"> 64 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 3/r32/EBX 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+4) to EBX</span> -<span id="L65" class="LineNr"> 65 </span> 81 5/subop/subtract 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> 1/imm32 <span class="Comment"># subtract 1 from EBX</span> -<span id="L66" class="LineNr"> 66 </span> <span class="Comment"># prepare call</span> -<span id="L67" class="LineNr"> 67 </span> 55/push-EBP -<span id="L68" class="LineNr"> 68 </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="L69" class="LineNr"> 69 </span> <span class="Comment"># EAX: factorial(n-1)</span> -<span id="L70" class="LineNr"> 70 </span> 53/push-EBX -<span id="L71" class="LineNr"> 71 </span> e8/call <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> factorial/disp32 -<span id="L72" class="LineNr"> 72 </span> <span class="Comment"># discard arg</span> -<span id="L73" class="LineNr"> 73 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> -<span id="L74" class="LineNr"> 74 </span> <span class="Comment"># clean up after call</span> -<span id="L75" class="LineNr"> 75 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span> -<span id="L76" class="LineNr"> 76 </span> 5d/pop <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># pop to EBP</span> -<span id="L77" class="LineNr"> 77 </span> <span class="Comment"># refresh n</span> -<span id="L78" class="LineNr"> 78 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 2/r32/EDX 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+4) to EDX</span> -<span id="L79" class="LineNr"> 79 </span> <span class="Comment"># return n * factorial(n-1)</span> -<span id="L80" class="LineNr"> 80 </span> f7 4/subop/multiply 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 4/disp8 <span class="Delimiter"> . </span> <span class="Comment"># multiply *(ESP+4) (n) into EAX (factorial(n-1))</span> -<span id="L81" class="LineNr"> 81 </span> <span class="Comment"># TODO: check for overflow</span> -<span id="L82" class="LineNr"> 82 </span>$factorial:exit: +<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># prolog</span> +<span id="L59" class="LineNr"> 59 </span> 55/push-EBP +<span id="L60" class="LineNr"> 60 </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="L61" class="LineNr"> 61 </span> 53/push-EBX +<span id="L62" class="LineNr"> 62 </span> <span class="Comment"># initialize EAX to 1 (base case)</span> +<span id="L63" class="LineNr"> 63 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># copy to EAX</span> +<span id="L64" class="LineNr"> 64 </span> <span class="Comment"># if (n <= 1) jump exit</span> +<span id="L65" class="LineNr"> 65 </span> 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/disp8 1/imm32 <span class="Comment"># compare *(EBP+8)</span> +<span id="L66" class="LineNr"> 66 </span> 7e/jump-if-<= $factorial:exit/disp8 +<span id="L67" class="LineNr"> 67 </span> <span class="Comment"># EBX: n-1</span> +<span id="L68" class="LineNr"> 68 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 3/r32/EBX 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(EBP+8) to EBX</span> +<span id="L69" class="LineNr"> 69 </span> 81 5/subop/subtract 3/mod/direct 3/rm32/EBX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32 <span class="Comment"># subtract from EBX</span> +<span id="L70" class="LineNr"> 70 </span> <span class="Comment"># EAX: factorial(n-1)</span> +<span id="L71" class="LineNr"> 71 </span> 53/push-EBX +<span id="L72" class="LineNr"> 72 </span> e8/call <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> factorial/disp32 +<span id="L73" class="LineNr"> 73 </span> <span class="Comment"># discard arg</span> +<span id="L74" class="LineNr"> 74 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span> +<span id="L75" class="LineNr"> 75 </span> <span class="Comment"># return n * factorial(n-1)</span> +<span id="L76" class="LineNr"> 76 </span> f7 4/subop/multiply 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none 8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># multiply *(EBP+8) into EAX</span> +<span id="L77" class="LineNr"> 77 </span> <span class="Comment"># TODO: check for overflow</span> +<span id="L78" class="LineNr"> 78 </span>$factorial:exit: +<span id="L79" class="LineNr"> 79 </span> <span class="Comment"># epilog</span> +<span id="L80" class="LineNr"> 80 </span> 5b/pop-to-EBX +<span id="L81" class="LineNr"> 81 </span> 89/copy 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/r32/EBP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy EBP to ESP</span> +<span id="L82" class="LineNr"> 82 </span> 5d/pop-to-EBP <span id="L83" class="LineNr"> 83 </span> c3/return <span id="L84" class="LineNr"> 84 </span> <span id="L85" class="LineNr"> 85 </span>test_factorial: @@ -146,118 +145,20 @@ if ('onhashchange' in window) { <span id="L89" class="LineNr"> 89 </span> <span class="Comment"># call</span> <span id="L90" class="LineNr"> 90 </span> e8/call factorial/disp32 <span id="L91" class="LineNr"> 91 </span> <span class="Comment"># discard arg</span> -<span id="L92" class="LineNr"> 92 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> +<span id="L92" class="LineNr"> 92 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add to ESP</span> <span id="L93" class="LineNr"> 93 </span> <span class="Comment"># check_ints_equal(EAX, 120, failure message)</span> <span id="L94" class="LineNr"> 94 </span> <span class="Comment"># push args</span> -<span id="L95" class="LineNr"> 95 </span> 50/push-EAX +<span id="L95" class="LineNr"> 95 </span> 68/push "F - test_factorial"/imm32 <span id="L96" class="LineNr"> 96 </span> 68/push 0x78/imm32/expected-120 -<span id="L97" class="LineNr"> 97 </span> 68/push "F - test_factorial"/imm32 +<span id="L97" class="LineNr"> 97 </span> 50/push-EAX <span id="L98" class="LineNr"> 98 </span> <span class="Comment"># call</span> <span id="L99" class="LineNr"> 99 </span> e8/call check_ints_equal/disp32 <span id="L100" class="LineNr">100 </span> <span class="Comment"># discard args</span> -<span id="L101" class="LineNr">101 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add 12 to ESP</span> +<span id="L101" class="LineNr">101 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xc/imm32 <span class="Comment"># add to ESP</span> <span id="L102" class="LineNr">102 </span> <span class="Comment"># end</span> <span id="L103" class="LineNr">103 </span> c3/return <span id="L104" class="LineNr">104 </span> -<span id="L105" class="LineNr">105 </span><span class="SalientComment">## helpers</span> -<span id="L106" class="LineNr">106 </span> -<span id="L107" class="LineNr">107 </span><span class="Comment"># print msg to stderr if a != b, otherwise print "."</span> -<span id="L108" class="LineNr">108 </span>check_ints_equal: <span class="Comment"># (a : int, b : int, msg : (address array byte)) -> boolean</span> -<span id="L109" class="LineNr">109 </span> <span class="Comment"># load args into EAX, EBX and ECX</span> -<span id="L110" class="LineNr">110 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 0/r32/EAX 0xc/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+12) to EAX</span> -<span id="L111" class="LineNr">111 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 3/r32/EBX 0x8/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+8) to EBX</span> -<span id="L112" class="LineNr">112 </span> <span class="Comment"># if EAX == b/EBX</span> -<span id="L113" class="LineNr">113 </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 and EBX</span> -<span id="L114" class="LineNr">114 </span> 75/jump-if-unequal $check_ints_equal:else/disp8 -<span id="L115" class="LineNr">115 </span> <span class="Comment"># print('.')</span> -<span id="L116" class="LineNr">116 </span> <span class="Comment"># push args</span> -<span id="L117" class="LineNr">117 </span> 68/push "."/imm32 -<span id="L118" class="LineNr">118 </span> <span class="Comment"># call</span> -<span id="L119" class="LineNr">119 </span> e8/call write_stderr/disp32 -<span id="L120" class="LineNr">120 </span> <span class="Comment"># discard arg</span> -<span id="L121" class="LineNr">121 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> -<span id="L122" class="LineNr">122 </span> <span class="Comment"># return</span> -<span id="L123" class="LineNr">123 </span> c3/return -<span id="L124" class="LineNr">124 </span> <span class="Comment"># else:</span> -<span id="L125" class="LineNr">125 </span>$check_ints_equal:else: -<span id="L126" class="LineNr">126 </span> <span class="Comment"># copy msg into ECX</span> -<span id="L127" class="LineNr">127 </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="L128" class="LineNr">128 </span> <span class="Comment"># print(ECX)</span> -<span id="L129" class="LineNr">129 </span> <span class="Comment"># push args</span> -<span id="L130" class="LineNr">130 </span> 51/push-ECX -<span id="L131" class="LineNr">131 </span> <span class="Comment"># call</span> -<span id="L132" class="LineNr">132 </span> e8/call write_stderr/disp32 -<span id="L133" class="LineNr">133 </span> <span class="Comment"># discard arg</span> -<span id="L134" class="LineNr">134 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> -<span id="L135" class="LineNr">135 </span> <span class="Comment"># print newline</span> -<span id="L136" class="LineNr">136 </span> <span class="Comment"># push args</span> -<span id="L137" class="LineNr">137 </span> 68/push Newline/imm32 -<span id="L138" class="LineNr">138 </span> <span class="Comment"># call</span> -<span id="L139" class="LineNr">139 </span> e8/call write_stderr/disp32 -<span id="L140" class="LineNr">140 </span> <span class="Comment"># discard arg</span> -<span id="L141" class="LineNr">141 </span> 81 0/subop/add 3/mod/direct 4/rm32/ESP <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ESP</span> -<span id="L142" class="LineNr">142 </span> <span class="Comment"># 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="Comment"># compare a null-terminated ascii string with a more idiomatic length-prefixed byte array</span> -<span id="L146" class="LineNr">146 </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="L147" class="LineNr">147 </span>argv_equal: <span class="Comment"># s : null-terminated ascii string, benchmark : length-prefixed ascii string -> EAX : boolean</span> -<span id="L148" class="LineNr">148 </span> <span class="Comment"># pseudocode:</span> -<span id="L149" class="LineNr">149 </span> <span class="Comment"># initialize n = b.length</span> -<span id="L150" class="LineNr">150 </span> <span class="Comment"># initialize s1 = s</span> -<span id="L151" class="LineNr">151 </span> <span class="Comment"># initialize s2 = b.data</span> -<span id="L152" class="LineNr">152 </span> <span class="Comment"># i = 0</span> -<span id="L153" class="LineNr">153 </span> <span class="Comment"># for (i = 0; i < n; ++n)</span> -<span id="L154" class="LineNr">154 </span> <span class="Comment"># c1 = *s1</span> -<span id="L155" class="LineNr">155 </span> <span class="Comment"># c2 = *s2</span> -<span id="L156" class="LineNr">156 </span> <span class="Comment"># if c1 == 0</span> -<span id="L157" class="LineNr">157 </span> <span class="Comment"># return false</span> -<span id="L158" class="LineNr">158 </span> <span class="Comment"># if c1 != c2</span> -<span id="L159" class="LineNr">159 </span> <span class="Comment"># return false</span> -<span id="L160" class="LineNr">160 </span> <span class="Comment"># return *s1 == 0</span> -<span id="L161" class="Folded">161 </span><span class="Folded">+-- 45 lines: # --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</span> -<span id="L206" class="Folded">206 </span><span class="Folded">+--134 lines: # tests for argv_equal -----------------------------------------------------------------------------------------------------------------------------------------------------------------------</span> -<span id="L340" class="LineNr">340 </span> -<span id="L341" class="LineNr">341 </span>write_stderr: <span class="Comment"># s : (address array byte) -> <void></span> -<span id="L342" class="LineNr">342 </span> <span class="Comment"># save registers</span> -<span id="L343" class="LineNr">343 </span> 50/push-EAX -<span id="L344" class="LineNr">344 </span> 51/push-ECX -<span id="L345" class="LineNr">345 </span> 52/push-EDX -<span id="L346" class="LineNr">346 </span> 53/push-EBX -<span id="L347" class="LineNr">347 </span> <span class="Comment"># write(2/stderr, (data) s+4, (size) *s)</span> -<span id="L348" class="LineNr">348 </span> <span class="Comment"># fd = 2 (stderr)</span> -<span id="L349" class="LineNr">349 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/imm32 <span class="Comment"># copy 2 to EBX</span> -<span id="L350" class="LineNr">350 </span> <span class="Comment"># x = s+4</span> -<span id="L351" class="LineNr">351 </span> 8b/copy 1/mod/*+disp8 4/rm32/SIB 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 1/r32/ECX 0x14/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+20) to ECX</span> -<span id="L352" class="LineNr">352 </span> 81 0/subop/add 3/mod/direct 1/rm32/ECX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32 <span class="Comment"># add 4 to ECX</span> -<span id="L353" class="LineNr">353 </span> <span class="Comment"># size = *s</span> -<span id="L354" class="LineNr">354 </span> 8b/copy 1/mod/*+disp8 4/rm32/SIB 4/base/ESP 4/index/none <span class="Delimiter"> . </span> 2/r32/EDX 0x14/disp8 <span class="Delimiter"> . </span> <span class="Comment"># copy *(ESP+20) to EDX</span> -<span id="L355" class="LineNr">355 </span> 8b/copy 0/mod/indirect 2/rm32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 2/r32/EDX <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Comment"># copy *EDX to EDX</span> -<span id="L356" class="LineNr">356 </span> <span class="Comment"># call write()</span> -<span id="L357" class="LineNr">357 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32/write <span class="Comment"># copy 1 to EAX</span> -<span id="L358" class="LineNr">358 </span> cd/syscall 0x80/imm8 -<span id="L359" class="LineNr">359 </span> <span class="Comment"># restore registers</span> -<span id="L360" class="LineNr">360 </span> 5b/pop-EBX -<span id="L361" class="LineNr">361 </span> 5a/pop-EDX -<span id="L362" class="LineNr">362 </span> 59/pop-ECX -<span id="L363" class="LineNr">363 </span> 58/pop-EAX -<span id="L364" class="LineNr">364 </span> <span class="Comment"># end</span> -<span id="L365" class="LineNr">365 </span> c3/return -<span id="L366" class="LineNr">366 </span> -<span id="L367" class="LineNr">367 </span>== data -<span id="L368" class="LineNr">368 </span>Newline: -<span id="L369" class="LineNr">369 </span> <span class="Comment"># size</span> -<span id="L370" class="LineNr">370 </span> 01 00 00 00 -<span id="L371" class="LineNr">371 </span> <span class="Comment"># data</span> -<span id="L372" class="LineNr">372 </span> 0a/newline -<span id="L373" class="LineNr">373 </span> -<span id="L374" class="LineNr">374 </span><span class="Comment"># for argv_equal tests</span> -<span id="L375" class="LineNr">375 </span>Null_argv: -<span id="L376" class="LineNr">376 </span> 00/null -<span id="L377" class="LineNr">377 </span>Abc_argv: -<span id="L378" class="LineNr">378 </span> 41/A 62/b 63/c 00/null -<span id="L379" class="LineNr">379 </span> -<span id="L380" class="LineNr">380 </span><span class="Comment"># vim:ft=subx:nowrap:so=0</span> +<span id="L105" class="LineNr">105 </span><span class="Comment"># vim:ft=subx:nowrap:so=0</span> </pre> </body> </html> |