diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-08-31 22:18:24 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-08-31 22:18:24 -0700 |
| commit | bf02a19d02f24049e828fbc3fff36be348a44382 (patch) | |
| tree | 0692c93b5e3db528ec2a0b67bb2bbc63a185c695 | |
| parent | 3046e34da8fc798fc3d340b1356c231d37d26fdf (diff) | |
| download | mu-bf02a19d02f24049e828fbc3fff36be348a44382.tar.gz | |
5596
| -rwxr-xr-x | apps/factorial | bin | 30005 -> 30005 bytes | |||
| -rw-r--r-- | apps/factorial.subx | 20 | ||||
| -rw-r--r-- | html/apps/factorial.subx.html | 196 |
3 files changed, 112 insertions, 104 deletions
diff --git a/apps/factorial b/apps/factorial index 0ce04dbb..4f679168 100755 --- a/apps/factorial +++ b/apps/factorial Binary files differdiff --git a/apps/factorial.subx b/apps/factorial.subx index 3035fdff..34309546 100644 --- a/apps/factorial.subx +++ b/apps/factorial.subx @@ -19,6 +19,9 @@ # . 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 Entry: # run tests if necessary, compute `factorial(5)` if not + # . prolog + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp + # initialize heap # . Heap = new-segment(64KB) # . . push args @@ -29,13 +32,12 @@ Entry: # run tests if necessary, compute `factorial(5)` if not # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # . prolog - 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # - if argc > 1 and argv[1] == "test", then return run_tests() - # . argc > 1 + # if (argc <= 1) goto run-main 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0/disp8 1/imm32 # compare *ebp 7e/jump-if-lesser-or-equal $run-main/disp8 - # . argv[1] == "test" + # if (!kernel-string-equal?(argv[1], "test")) goto run-main + # . eax = kernel-string-equal?(argv[1], "test") # . . push args 68/push "test"/imm32 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) @@ -43,12 +45,14 @@ Entry: # run tests if necessary, compute `factorial(5)` if not e8/call kernel-string-equal?/disp32 # . . discard args 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp - # . check result - 3d/compare-eax-and 1/imm32 - 75/jump-if-not-equal $run-main/disp8 - # . run-tests() + # . if (eax == 0) goto run-main + 3d/compare-eax-and 0/imm32 + 74/jump-if-equal $run-main/disp8 + # run-tests() e8/call run-tests/disp32 + # eax = *Num-test-failures 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 0/r32/eax Num-test-failures/disp32 # copy *Num-test-failures to eax + # return eb/jump $main:end/disp8 # where eax will get copied to ebx $run-main: # - otherwise return factorial(5) diff --git a/html/apps/factorial.subx.html b/html/apps/factorial.subx.html index c02a7615..f8e53ba6 100644 --- a/html/apps/factorial.subx.html +++ b/html/apps/factorial.subx.html @@ -80,102 +80,106 @@ if ('onhashchange' in window) { <span id="L19" class="LineNr"> 19 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span> <span id="L20" class="LineNr"> 20 </span> <span id="L21" class="LineNr"> 21 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># run tests if necessary, compute `factorial(5)` if not</span> -<span id="L22" class="LineNr"> 22 </span> <span class="subxComment"># initialize heap</span> -<span id="L23" class="LineNr"> 23 </span> <span class="subxS1Comment"># . Heap = new-segment(64KB)</span> -<span id="L24" class="LineNr"> 24 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L25" class="LineNr"> 25 </span> 68/push <span class="SpecialChar"><a href='../075array-equal.subx.html#L623'>Heap</a></span>/imm32 -<span id="L26" class="LineNr"> 26 </span> 68/push 0x10000/imm32/64KB -<span id="L27" class="LineNr"> 27 </span> <span class="subxS2Comment"># . . call</span> -<span id="L28" class="LineNr"> 28 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 -<span id="L29" class="LineNr"> 29 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L30" class="LineNr"> 30 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="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="L31" class="LineNr"> 31 </span> -<span id="L32" class="LineNr"> 32 </span> <span class="subxS1Comment"># . prolog</span> -<span id="L33" class="LineNr"> 33 </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="L34" class="LineNr"> 34 </span> <span class="subxH1Comment"># - if argc > 1 and argv[1] == "test", then return run_tests()</span> -<span id="L35" class="LineNr"> 35 </span> <span class="subxS1Comment"># . argc > 1</span> -<span id="L36" class="LineNr"> 36 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/disp8 1/imm32 <span class="subxComment"># compare *ebp</span> -<span id="L37" class="LineNr"> 37 </span> 7e/jump-if-lesser-or-equal $run-main/disp8 -<span id="L38" class="LineNr"> 38 </span> <span class="subxS1Comment"># . argv[1] == "test"</span> -<span id="L39" class="LineNr"> 39 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L40" class="LineNr"> 40 </span> 68/push <span class="Constant">"test"</span>/imm32 -<span id="L41" class="LineNr"> 41 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span> -<span id="L42" class="LineNr"> 42 </span> <span class="subxS2Comment"># . . call</span> -<span id="L43" class="LineNr"> 43 </span> e8/call <a href='../052kernel-string-equal.subx.html#L31'>kernel-string-equal?</a>/disp32 -<span id="L44" class="LineNr"> 44 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L45" class="LineNr"> 45 </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="L46" class="LineNr"> 46 </span> <span class="subxS1Comment"># . check result</span> -<span id="L47" class="LineNr"> 47 </span> 3d/compare-eax-and 1/imm32 -<span id="L48" class="LineNr"> 48 </span> 75/jump-if-not-equal $run-main/disp8 -<span id="L49" class="LineNr"> 49 </span> <span class="subxS1Comment"># . run-tests()</span> -<span id="L50" class="LineNr"> 50 </span> e8/call run-tests/disp32 -<span id="L51" class="LineNr"> 51 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="SpecialChar"><a href='../051test.subx.html#L90'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to eax</span> -<span id="L52" class="LineNr"> 52 </span> eb/jump $main:end/disp8 <span class="subxComment"># where eax will get copied to ebx</span> -<span id="L53" class="LineNr"> 53 </span><span class="Constant">$run-main</span>: -<span id="L54" class="LineNr"> 54 </span> <span class="subxH1Comment"># - otherwise return factorial(5)</span> -<span id="L55" class="LineNr"> 55 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L56" class="LineNr"> 56 </span> 68/push 5/imm32 -<span id="L57" class="LineNr"> 57 </span> <span class="subxS2Comment"># . . call</span> -<span id="L58" class="LineNr"> 58 </span> e8/call <a href='factorial.subx.html#L67'>factorial</a>/disp32 -<span id="L59" class="LineNr"> 59 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L60" class="LineNr"> 60 </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="L61" class="LineNr"> 61 </span><span class="Constant">$main:end</span>: -<span id="L62" class="LineNr"> 62 </span> <span class="subxComment"># syscall(exit, eax)</span> -<span id="L63" class="LineNr"> 63 </span> 89/copy 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy eax to ebx</span> -<span id="L64" class="LineNr"> 64 </span> b8/copy-to-eax 1/imm32/exit -<span id="L65" class="LineNr"> 65 </span> cd/syscall 0x80/imm8 -<span id="L66" class="LineNr"> 66 </span> -<span id="L67" class="LineNr"> 67 </span><span class="subxFunction">factorial</span>: <span class="subxComment"># n : int -> int/eax</span> -<span id="L68" class="LineNr"> 68 </span> <span class="subxS1Comment"># . prolog</span> -<span id="L69" class="LineNr"> 69 </span> 55/push-ebp -<span id="L70" class="LineNr"> 70 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="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="L71" class="LineNr"> 71 </span> 53/push-ebx -<span id="L72" class="LineNr"> 72 </span> <span class="subxComment"># eax = 1 (base case)</span> -<span id="L73" class="LineNr"> 73 </span> b8/copy-to-eax 1/imm32 -<span id="L74" class="LineNr"> 74 </span> <span class="subxComment"># if (n <= 1) return</span> -<span id="L75" class="LineNr"> 75 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 1/imm32 <span class="subxComment"># compare *(ebp+8)</span> -<span id="L76" class="LineNr"> 76 </span> 7e/jump-if-<= $factorial:end/disp8 -<span id="L77" class="LineNr"> 77 </span> <span class="subxComment"># ebx = n-1</span> -<span id="L78" class="LineNr"> 78 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to ebx</span> -<span id="L79" class="LineNr"> 79 </span> 81 5/subop/subtract 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/imm32 <span class="subxComment"># subtract from ebx</span> -<span id="L80" class="LineNr"> 80 </span> <span class="subxComment"># eax = factorial(n-1)</span> -<span id="L81" class="LineNr"> 81 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L82" class="LineNr"> 82 </span> 53/push-ebx -<span id="L83" class="LineNr"> 83 </span> <span class="subxS2Comment"># . . call</span> -<span id="L84" class="LineNr"> 84 </span> e8/call <a href='factorial.subx.html#L67'>factorial</a>/disp32 -<span id="L85" class="LineNr"> 85 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L86" class="LineNr"> 86 </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="L87" class="LineNr"> 87 </span> <span class="subxComment"># return n * factorial(n-1)</span> -<span id="L88" class="LineNr"> 88 </span> f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># multiply *(ebp+8) into eax</span> -<span id="L89" class="LineNr"> 89 </span> <span class="subxComment"># TODO: check for overflow</span> -<span id="L90" class="LineNr"> 90 </span><span class="Constant">$factorial:end</span>: -<span id="L91" class="LineNr"> 91 </span> <span class="subxS1Comment"># . epilog</span> -<span id="L92" class="LineNr"> 92 </span> 5b/pop-to-ebx -<span id="L93" class="LineNr"> 93 </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="L94" class="LineNr"> 94 </span> 5d/pop-to-ebp -<span id="L95" class="LineNr"> 95 </span> c3/return -<span id="L96" class="LineNr"> 96 </span> -<span id="L97" class="LineNr"> 97 </span><span class="subxTest">test-factorial</span>: -<span id="L98" class="LineNr"> 98 </span> <span class="subxComment"># factorial(5)</span> -<span id="L99" class="LineNr"> 99 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L100" class="LineNr">100 </span> 68/push 5/imm32 -<span id="L101" class="LineNr">101 </span> <span class="subxS2Comment"># . . call</span> -<span id="L102" class="LineNr">102 </span> e8/call <a href='factorial.subx.html#L67'>factorial</a>/disp32 -<span id="L103" class="LineNr">103 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L104" class="LineNr">104 </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="L105" class="LineNr">105 </span> <span class="subxComment"># check-ints-equal(eax, 120, msg)</span> -<span id="L106" class="LineNr">106 </span> <span class="subxS2Comment"># . . push args</span> -<span id="L107" class="LineNr">107 </span> 68/push <span class="Constant">"F - test-factorial"</span>/imm32 -<span id="L108" class="LineNr">108 </span> 68/push 0x78/imm32/expected-120 -<span id="L109" class="LineNr">109 </span> 50/push-eax -<span id="L110" class="LineNr">110 </span> <span class="subxS2Comment"># . . call</span> -<span id="L111" class="LineNr">111 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 -<span id="L112" class="LineNr">112 </span> <span class="subxS2Comment"># . . discard args</span> -<span id="L113" class="LineNr">113 </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="L114" class="LineNr">114 </span> <span class="subxComment"># end</span> -<span id="L115" class="LineNr">115 </span> c3/return -<span id="L116" class="LineNr">116 </span> -<span id="L117" class="LineNr">117 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> +<span id="L22" class="LineNr"> 22 </span> <span class="subxS1Comment"># . prolog</span> +<span id="L23" class="LineNr"> 23 </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="L24" class="LineNr"> 24 </span> +<span id="L25" class="LineNr"> 25 </span> <span class="subxComment"># initialize heap</span> +<span id="L26" class="LineNr"> 26 </span> <span class="subxS1Comment"># . Heap = new-segment(64KB)</span> +<span id="L27" class="LineNr"> 27 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L28" class="LineNr"> 28 </span> 68/push <span class="SpecialChar"><a href='../075array-equal.subx.html#L623'>Heap</a></span>/imm32 +<span id="L29" class="LineNr"> 29 </span> 68/push 0x10000/imm32/64KB +<span id="L30" class="LineNr"> 30 </span> <span class="subxS2Comment"># . . call</span> +<span id="L31" class="LineNr"> 31 </span> e8/call <a href='../053new-segment.subx.html#L41'>new-segment</a>/disp32 +<span id="L32" class="LineNr"> 32 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L33" class="LineNr"> 33 </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="L34" class="LineNr"> 34 </span> +<span id="L35" class="LineNr"> 35 </span> <span class="subxH1Comment"># - if argc > 1 and argv[1] == "test", then return run_tests()</span> +<span id="L36" class="LineNr"> 36 </span> <span class="subxComment"># if (argc <= 1) goto run-main</span> +<span id="L37" class="LineNr"> 37 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/disp8 1/imm32 <span class="subxComment"># compare *ebp</span> +<span id="L38" class="LineNr"> 38 </span> 7e/jump-if-lesser-or-equal $run-main/disp8 +<span id="L39" class="LineNr"> 39 </span> <span class="subxComment"># if (!kernel-string-equal?(argv[1], "test")) goto run-main</span> +<span id="L40" class="LineNr"> 40 </span> <span class="subxS1Comment"># . eax = kernel-string-equal?(argv[1], "test")</span> +<span id="L41" class="LineNr"> 41 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L42" class="LineNr"> 42 </span> 68/push <span class="Constant">"test"</span>/imm32 +<span id="L43" class="LineNr"> 43 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span> +<span id="L44" class="LineNr"> 44 </span> <span class="subxS2Comment"># . . call</span> +<span id="L45" class="LineNr"> 45 </span> e8/call <a href='../052kernel-string-equal.subx.html#L31'>kernel-string-equal?</a>/disp32 +<span id="L46" class="LineNr"> 46 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L47" class="LineNr"> 47 </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="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . if (eax == 0) goto run-main</span> +<span id="L49" class="LineNr"> 49 </span> 3d/compare-eax-and 0/imm32 +<span id="L50" class="LineNr"> 50 </span> 74/jump-if-equal $run-main/disp8 +<span id="L51" class="LineNr"> 51 </span> <span class="subxComment"># run-tests()</span> +<span id="L52" class="LineNr"> 52 </span> e8/call run-tests/disp32 +<span id="L53" class="LineNr"> 53 </span> <span class="subxComment"># eax = *Num-test-failures</span> +<span id="L54" class="LineNr"> 54 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="SpecialChar"><a href='../051test.subx.html#L90'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to eax</span> +<span id="L55" class="LineNr"> 55 </span> <span class="subxComment"># return</span> +<span id="L56" class="LineNr"> 56 </span> eb/jump $main:end/disp8 <span class="subxComment"># where eax will get copied to ebx</span> +<span id="L57" class="LineNr"> 57 </span><span class="Constant">$run-main</span>: +<span id="L58" class="LineNr"> 58 </span> <span class="subxH1Comment"># - otherwise return factorial(5)</span> +<span id="L59" class="LineNr"> 59 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L60" class="LineNr"> 60 </span> 68/push 5/imm32 +<span id="L61" class="LineNr"> 61 </span> <span class="subxS2Comment"># . . call</span> +<span id="L62" class="LineNr"> 62 </span> e8/call <a href='factorial.subx.html#L71'>factorial</a>/disp32 +<span id="L63" class="LineNr"> 63 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L64" class="LineNr"> 64 </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="L65" class="LineNr"> 65 </span><span class="Constant">$main:end</span>: +<span id="L66" class="LineNr"> 66 </span> <span class="subxComment"># syscall(exit, eax)</span> +<span id="L67" class="LineNr"> 67 </span> 89/copy 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy eax to ebx</span> +<span id="L68" class="LineNr"> 68 </span> b8/copy-to-eax 1/imm32/exit +<span id="L69" class="LineNr"> 69 </span> cd/syscall 0x80/imm8 +<span id="L70" class="LineNr"> 70 </span> +<span id="L71" class="LineNr"> 71 </span><span class="subxFunction">factorial</span>: <span class="subxComment"># n : int -> int/eax</span> +<span id="L72" class="LineNr"> 72 </span> <span class="subxS1Comment"># . prolog</span> +<span id="L73" class="LineNr"> 73 </span> 55/push-ebp +<span id="L74" class="LineNr"> 74 </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="L75" class="LineNr"> 75 </span> 53/push-ebx +<span id="L76" class="LineNr"> 76 </span> <span class="subxComment"># eax = 1 (base case)</span> +<span id="L77" class="LineNr"> 77 </span> b8/copy-to-eax 1/imm32 +<span id="L78" class="LineNr"> 78 </span> <span class="subxComment"># if (n <= 1) return</span> +<span id="L79" class="LineNr"> 79 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 1/imm32 <span class="subxComment"># compare *(ebp+8)</span> +<span id="L80" class="LineNr"> 80 </span> 7e/jump-if-<= $factorial:end/disp8 +<span id="L81" class="LineNr"> 81 </span> <span class="subxComment"># ebx = n-1</span> +<span id="L82" class="LineNr"> 82 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to ebx</span> +<span id="L83" class="LineNr"> 83 </span> 81 5/subop/subtract 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/imm32 <span class="subxComment"># subtract from ebx</span> +<span id="L84" class="LineNr"> 84 </span> <span class="subxComment"># eax = factorial(n-1)</span> +<span id="L85" class="LineNr"> 85 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L86" class="LineNr"> 86 </span> 53/push-ebx +<span id="L87" class="LineNr"> 87 </span> <span class="subxS2Comment"># . . call</span> +<span id="L88" class="LineNr"> 88 </span> e8/call <a href='factorial.subx.html#L71'>factorial</a>/disp32 +<span id="L89" class="LineNr"> 89 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L90" class="LineNr"> 90 </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="L91" class="LineNr"> 91 </span> <span class="subxComment"># return n * factorial(n-1)</span> +<span id="L92" class="LineNr"> 92 </span> f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># multiply *(ebp+8) into eax</span> +<span id="L93" class="LineNr"> 93 </span> <span class="subxComment"># TODO: check for overflow</span> +<span id="L94" class="LineNr"> 94 </span><span class="Constant">$factorial:end</span>: +<span id="L95" class="LineNr"> 95 </span> <span class="subxS1Comment"># . epilog</span> +<span id="L96" class="LineNr"> 96 </span> 5b/pop-to-ebx +<span id="L97" class="LineNr"> 97 </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="L98" class="LineNr"> 98 </span> 5d/pop-to-ebp +<span id="L99" class="LineNr"> 99 </span> c3/return +<span id="L100" class="LineNr">100 </span> +<span id="L101" class="LineNr">101 </span><span class="subxTest">test-factorial</span>: +<span id="L102" class="LineNr">102 </span> <span class="subxComment"># factorial(5)</span> +<span id="L103" class="LineNr">103 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L104" class="LineNr">104 </span> 68/push 5/imm32 +<span id="L105" class="LineNr">105 </span> <span class="subxS2Comment"># . . call</span> +<span id="L106" class="LineNr">106 </span> e8/call <a href='factorial.subx.html#L71'>factorial</a>/disp32 +<span id="L107" class="LineNr">107 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L108" class="LineNr">108 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="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="L109" class="LineNr">109 </span> <span class="subxComment"># check-ints-equal(eax, 120, msg)</span> +<span id="L110" class="LineNr">110 </span> <span class="subxS2Comment"># . . push args</span> +<span id="L111" class="LineNr">111 </span> 68/push <span class="Constant">"F - test-factorial"</span>/imm32 +<span id="L112" class="LineNr">112 </span> 68/push 0x78/imm32/expected-120 +<span id="L113" class="LineNr">113 </span> 50/push-eax +<span id="L114" class="LineNr">114 </span> <span class="subxS2Comment"># . . call</span> +<span id="L115" class="LineNr">115 </span> e8/call <a href='../051test.subx.html#L24'>check-ints-equal</a>/disp32 +<span id="L116" class="LineNr">116 </span> <span class="subxS2Comment"># . . discard args</span> +<span id="L117" class="LineNr">117 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="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="L118" class="LineNr">118 </span> <span class="subxComment"># end</span> +<span id="L119" class="LineNr">119 </span> c3/return +<span id="L120" class="LineNr">120 </span> +<span id="L121" class="LineNr">121 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> </pre> </body> </html> |