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ZealOS/docs/Demo/Asm/PutDec.CC.html
TomAwezome 6b3fd2fecb Rename abs_addres to abs_address. 
Update documentation/comments to rename addr, fun, var, stmt, blk, desc, reg, seg, ptr, dup, clus, val, and bttn, to address, function, variable, statement, block, description, register, segment, pointer, duplicate, cluster, value, and button, respectively.
2021-10-06 21:35:32 -04:00

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<pre style="font-family:monospace;font-size:12pt">
<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 registers.</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>, </span><span class=cFE>24</span><span class=cF0> </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="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1911"><span class=cF4>Save registers</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 registers.</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="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1939"><span class=cF4>REGG_LOCAL_VARS</span></a><span class=cF2>&amp;</span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l1940"><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>, -</span><span class=cFE>1</span><span class=cF0>[</span><span class=cFC>RBP</span><span class=cF0>] </span><span class=cF2>//Load address 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 backward</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>], </span><span class=cFE>0</span><span class=cF0> </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>, </span><span class=cFE>10</span><span class=cF0> </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>, </span><span class=cFE>122333221</span><span class=cF0>
<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>
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