<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="generator" content="TempleOS V5.03">
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="/style/templeos.css">
<script src="/script/templeos.js"></script>
<style type="text/css">
.cF0{color:#000000;background-color:#ffffff;}
.cF1{color:#0000aa;background-color:#ffffff;}
.cF2{color:#00aa00;background-color:#ffffff;}
.cF3{color:#00aaaa;background-color:#ffffff;}
.cF4{color:#aa0000;background-color:#ffffff;}
.cF5{color:#aa00aa;background-color:#ffffff;}
.cF6{color:#aa5500;background-color:#ffffff;}
.cF7{color:#aaaaaa;background-color:#ffffff;}
.cF8{color:#555555;background-color:#ffffff;}
.cF9{color:#5555ff;background-color:#ffffff;}
.cFA{color:#55ff55;background-color:#ffffff;}
.cFB{color:#55ffff;background-color:#ffffff;}
.cFC{color:#ff5555;background-color:#ffffff;}
.cFD{color:#ff55ff;background-color:#ffffff;}
.cFE{color:#ffff55;background-color:#ffffff;}
.cFF{color:#ffffff;background-color:#ffffff;}
</style>
</head>
<body>
<pre id="content">
<a name="l1"></a><span class=cF1>asm</span><span class=cF0> {
<a name="l2"></a>PUT_DEC_U64::
<a name="l3"></a></span><span class=cF2>//RAX is number to print in decimal.</span><span class=cF0>
<a name="l4"></a></span><span class=cF2>//Preserves all regs.</span><span class=cF0>
<a name="l5"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>
<a name="l6"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RBP</span><span class=cF0>,</span><span class=cFC>RSP</span><span class=cF0>
<a name="l7"></a> </span><span class=cF1>SUB</span><span class=cF0> </span><span class=cFC>RSP</span><span class=cF0>,24 </span><span class=cF2>//24 char buffer on stack</span><span class=cF0>
<a name="l8"></a>
<a name="l9"></a></span><span class=cF2>//</span><a href="/Wb/Kernel/KernelA.HH.HTML#l1776"><span class=cF4>Save regs</span></a><span class=cF2> which C code is free to clobber. We don't have to for C callers,</span><span class=cF0>
<a name="l10"></a></span><span class=cF2>//but this function will be nice for ASM callers if it saves all regs.</span><span class=cF0>
<a name="l11"></a> </span><span class=cF3>PUSH_C_REGS</span><span class=cF0>
<a name="l12"></a>
<a name="l13"></a> </span><span class=cF1>PUSH</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0> </span><span class=cF2>//See </span><a href="/Wb/Kernel/KernelA.HH.HTML#l1804"><span class=cF4>REGG_LOCAL_VARS</span></a><span class=cF2>&</span><a href="/Wb/Kernel/KernelA.HH.HTML#l1805"><span class=cF4>REGG_LOCAL_NON_PTR_VARS</span></a><span class=cF0>
<a name="l14"></a> </span><span class=cF1>LEA</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>,-1[</span><span class=cFC>RBP</span><span class=cF0>] </span><span class=cF2>//Load addr of end of buffer.</span><span class=cF0>
<a name="l15"></a> </span><span class=cF2>//We picked RSI because of PUT_STR</span><span class=cF0>
<a name="l16"></a> </span><span class=cF2>//We'll move bwd</span><span class=cF0>
<a name="l17"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF1>U8</span><span class=cF0> [</span><span class=cFC>RSI</span><span class=cF0>],0 </span><span class=cF2>//Terminator</span><span class=cF0>
<a name="l18"></a>
<a name="l19"></a> </span><span class=cF1>TEST</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>,</span><span class=cFC>RAX</span><span class=cF0> </span><span class=cF2>//Special case -- zero</span><span class=cF0>
<a name="l20"></a> </span><span class=cF1>JNZ</span><span class=cF0> @@05
<a name="l21"></a> </span><span class=cF1>DEC</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>
<a name="l22"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF1>U8</span><span class=cF0> [</span><span class=cFC>RSI</span><span class=cF0>],</span><span class=cF6>'0'</span><span class=cF0>
<a name="l23"></a> </span><span class=cF1>JMP</span><span class=cF0> @@15
<a name="l24"></a>
<a name="l25"></a>@@05: </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RBX</span><span class=cF0>,10 </span><span class=cF2>//Divides by 10</span><span class=cF0>
<a name="l26"></a>
<a name="l27"></a>@@10: </span><span class=cF1>XOR</span><span class=cF0> </span><span class=cFC>RDX</span><span class=cF0>,</span><span class=cFC>RDX</span><span class=cF0>
<a name="l28"></a> </span><span class=cF1>DIV</span><span class=cF0> </span><span class=cFC>RBX</span><span class=cF0> </span><span class=cF2>//RAX=(RDX:RAX)/RBX with remainder in RDX</span><span class=cF0>
<a name="l29"></a> </span><span class=cF1>ADD</span><span class=cF0> </span><span class=cFC>RDX</span><span class=cF0>,</span><span class=cF6>'0'</span><span class=cF0>
<a name="l30"></a> </span><span class=cF1>DEC</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>
<a name="l31"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cF1>U8</span><span class=cF0> [</span><span class=cFC>RSI</span><span class=cF0>],</span><span class=cFC>DL</span><span class=cF0>
<a name="l32"></a> </span><span class=cF1>TEST</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>,</span><span class=cFC>RAX</span><span class=cF0>
<a name="l33"></a> </span><span class=cF1>JNZ</span><span class=cF0> @@10
<a name="l34"></a>
<a name="l35"></a>@@15: </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cFD>PUT_STR</span><span class=cF0>
<a name="l36"></a> </span><span class=cF1>POP</span><span class=cF0> </span><span class=cFC>RSI</span><span class=cF0>
<a name="l37"></a> </span><span class=cF3>POP_C_REGS</span><span class=cF0>
<a name="l38"></a> </span><span class=cF1>LEAVE</span><span class=cF0>
<a name="l39"></a> </span><span class=cF1>RET</span><span class=cF0>
<a name="l40"></a>
<a name="l41"></a>_DO_IT:: </span><span class=cF2>//The convention is C-callable routines have underscores.</span><span class=cF0>
<a name="l42"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>,122333221
<a name="l43"></a> </span><span class=cF1>CALL</span><span class=cF0> PUT_DEC_U64
<a name="l44"></a> </span><span class=cF1>MOV</span><span class=cF0> </span><span class=cFC>RAX</span><span class=cF0>,</span><span class=cF6>'\n'</span><span class=cF0>
<a name="l45"></a> </span><span class=cF1>CALL</span><span class=cF0> </span><span class=cFD>PUT_CHARS</span><span class=cF0>
<a name="l46"></a> </span><span class=cF1>RET</span><span class=cF0>
<a name="l47"></a>}
<a name="l48"></a>
<a name="l49"></a></span><span class=cF5>Call</span><span class=cF0>(_DO_IT);
</span></pre></body>
</html>