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< 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>
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< 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>
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< a name = " l8 " > < / a >
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< a name = " l9 " > < / a > < / span > < span class = cF2 > //</span><a href="https://tomawezome.github.io/ZealOS/Kernel/KernelA.html#l1910"><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>
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< 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>
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< a name = " l11 " > < / a > < / span > < span class = cF3 > PUSH_C_REGS < / span > < span class = cF0 >
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< a name = " l12 " > < / a >
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< 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://tomawezome.github.io/ZealOS/Kernel/KernelA.html#l1938"><span class=cF4>REGG_LOCAL_VARS</span></a><span class=cF2>&</span><a href="https://tomawezome.github.io/ZealOS/Kernel/KernelA.html#l1939"><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 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 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>
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< a name = " l18 " > < / a >
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< 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
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< a name = " l24 " > < / a >
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< 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>
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< a name = " l26 " > < / a >
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< 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
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< a name = " l34 " > < / a >
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< 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 >
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< a name = " l40 " > < / a >
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< 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 >
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< a name = " l47 " > < / a > }
< a name = " l48 " > < / a >
< a name = " l49 " > < / a > < / span > < span class = cF5 > Call < / span > < span class = cF0 > ( _DO_IT ) ;
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