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< a href = 'https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx' > https://github.com/akkartik/mu/blob/main/baremetal/103grapheme.subx< / a >
< pre id = 'vimCodeElement' >
2021-01-14 22:03:32 +00:00
< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > # Use the built-in font to draw a grapheme to screen.< / span >
< span id = "L2" class = "LineNr" > 2 < / span >
< span id = "L3" class = "LineNr" > 3 < / span > == code
< span id = "L4" class = "LineNr" > 4 < / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "subxFunction" > draw-grapheme< / span > : < span class = "subxComment" > # screen: (addr screen), g: grapheme, x: int, y: int, color: int< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L7" class = "LineNr" > 7 < / span > 55/push-ebp
< span id = "L8" class = "LineNr" > 8 < / span > 89/< - %ebp 4/r32/esp
< span id = "L9" class = "LineNr" > 9 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L10" class = "LineNr" > 10 < / span > 50/push-eax
< span id = "L11" class = "LineNr" > 11 < / span > 51/push-ecx
< span id = "L12" class = "LineNr" > 12 < / span > 52/push-edx
< span id = "L13" class = "LineNr" > 13 < / span > 53/push-ebx
< span id = "L14" class = "LineNr" > 14 < / span > 56/push-esi
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "subxComment" > # TODO: support fake screen; we currently assume 'screen' is always 0 (real)< / span >
< span id = "L16" class = "LineNr" > 16 < / span > < span class = "subxComment" > # var letter-bitmap/esi = font[g]< / span >
< span id = "L17" class = "LineNr" > 17 < / span > 8b/-> *(ebp+0xc) 6/r32/esi
< span id = "L18" class = "LineNr" > 18 < / span > c1 4/subop/shift-left %esi 4/imm8
< span id = "L19" class = "LineNr" > 19 < / span > 8d/copy-address *(esi+0x8800) 6/r32/esi < span class = "subxComment" > # font-start< / span >
< span id = "L20" class = "LineNr" > 20 < / span > < span class = "subxComment" > # if (letter-bitmap > = 0x9000) return # characters beyond ASCII currently not supported< / span >
< span id = "L21" class = "LineNr" > 21 < / span > 81 7/subop/compare %esi 0x9000/imm32
< span id = "L22" class = "LineNr" > 22 < / span > 7d/jump-if-> = $draw-grapheme:end/disp8
< span id = "L23" class = "LineNr" > 23 < / span > < span class = "subxComment" > # edx = y< / span >
< span id = "L24" class = "LineNr" > 24 < / span > 8b/-> *(ebp+0x14) 2/r32/edx
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "subxComment" > # var ymax/ebx: int = y + 16< / span >
< span id = "L26" class = "LineNr" > 26 < / span > 8b/-> *(ebp+0x14) 3/r32/ebx
< span id = "L27" class = "LineNr" > 27 < / span > 81 0/subop/add %ebx 0x10/imm32
< span id = "L28" class = "LineNr" > 28 < / span > {
< span id = "L29" class = "LineNr" > 29 < / span > < span class = "subxComment" > # if (y > = ymax) break< / span >
< span id = "L30" class = "LineNr" > 30 < / span > 39/compare %edx 3/r32/ebx
< span id = "L31" class = "LineNr" > 31 < / span > 7d/jump-if-> = < span class = "Constant" > break< / span > /disp8
< span id = "L32" class = "LineNr" > 32 < / span > < span class = "subxComment" > # eax = x + 7< / span >
< span id = "L33" class = "LineNr" > 33 < / span > 8b/-> *(ebp+0x10) 0/r32/eax
< span id = "L34" class = "LineNr" > 34 < / span > 81 0/subop/add %eax 7/imm32
< span id = "L35" class = "LineNr" > 35 < / span > < span class = "subxComment" > # var xmin/ecx: int = x< / span >
< span id = "L36" class = "LineNr" > 36 < / span > 8b/-> *(ebp+0x10) 1/r32/ecx
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "subxComment" > # var row-bitmap/ebx: int = *letter-bitmap< / span >
< span id = "L38" class = "LineNr" > 38 < / span > 53/push-ebx
< span id = "L39" class = "LineNr" > 39 < / span > 8b/-> *esi 3/r32/ebx
< span id = "L40" class = "LineNr" > 40 < / span > {
< span id = "L41" class = "LineNr" > 41 < / span > < span class = "subxComment" > # if (x < xmin) break< / span >
< span id = "L42" class = "LineNr" > 42 < / span > 39/compare %eax 1/r32/ecx
< span id = "L43" class = "LineNr" > 43 < / span > 7c/jump-if-< < span class = "Constant" > break< / span > /disp8
< span id = "L44" class = "LineNr" > 44 < / span > < span class = "subxComment" > # shift LSB from row-bitmap into carry flag (CF)< / span >
< span id = "L45" class = "LineNr" > 45 < / span > c1 5/subop/shift-right-logical %ebx 1/imm8
< span id = "L46" class = "LineNr" > 46 < / span > < span class = "subxComment" > # if LSB, draw a pixel< / span >
< span id = "L47" class = "LineNr" > 47 < / span > {
< span id = "L48" class = "LineNr" > 48 < / span > 73/jump-if-not-CF < span class = "Constant" > break< / span > /disp8
< span id = "L49" class = "LineNr" > 49 < / span > (< a href = '101screen.subx.html#L5' > pixel< / a > *(ebp+8) %eax %edx *(ebp+0x18))
< span id = "L50" class = "LineNr" > 50 < / span > }
< span id = "L51" class = "LineNr" > 51 < / span > < span class = "subxComment" > # --x< / span >
< span id = "L52" class = "LineNr" > 52 < / span > 48/decrement-eax
< span id = "L53" class = "LineNr" > 53 < / span > < span class = "subxComment" > #< / span >
< span id = "L54" class = "LineNr" > 54 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L55" class = "LineNr" > 55 < / span > }
< span id = "L56" class = "LineNr" > 56 < / span > < span class = "subxComment" > # reclaim row-bitmap< / span >
< span id = "L57" class = "LineNr" > 57 < / span > 5b/pop-to-ebx
< span id = "L58" class = "LineNr" > 58 < / span > < span class = "subxComment" > # ++y< / span >
< span id = "L59" class = "LineNr" > 59 < / span > 42/increment-edx
< span id = "L60" class = "LineNr" > 60 < / span > < span class = "subxComment" > # next bitmap row< / span >
< span id = "L61" class = "LineNr" > 61 < / span > 46/increment-esi
< span id = "L62" class = "LineNr" > 62 < / span > < span class = "subxComment" > #< / span >
< span id = "L63" class = "LineNr" > 63 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L64" class = "LineNr" > 64 < / span > }
< span id = "L65" class = "LineNr" > 65 < / span > < span class = "Constant" > $draw-grapheme:end< / span > :
< span id = "L66" class = "LineNr" > 66 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L67" class = "LineNr" > 67 < / span > 5e/pop-to-esi
< span id = "L68" class = "LineNr" > 68 < / span > 5b/pop-to-ebx
< span id = "L69" class = "LineNr" > 69 < / span > 5a/pop-to-edx
< span id = "L70" class = "LineNr" > 70 < / span > 59/pop-to-ecx
< span id = "L71" class = "LineNr" > 71 < / span > 58/pop-to-eax
< span id = "L72" class = "LineNr" > 72 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L73" class = "LineNr" > 73 < / span > 89/< - %esp 5/r32/ebp
< span id = "L74" class = "LineNr" > 74 < / span > 5d/pop-to-ebp
< span id = "L75" class = "LineNr" > 75 < / span > c3/return
< span id = "L76" class = "LineNr" > 76 < / span >
< span id = "L77" class = "LineNr" > 77 < / span > < span class = "subxFunction" > cursor-position< / span > : < span class = "subxComment" > # screen: (addr screen) -> _/eax: int, _/ecx: int< / span >
< span id = "L78" class = "LineNr" > 78 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L79" class = "LineNr" > 79 < / span > 55/push-ebp
< span id = "L80" class = "LineNr" > 80 < / span > 89/< - %ebp 4/r32/esp
< span id = "L81" class = "LineNr" > 81 < / span > < span class = "subxComment" > # TODO: support fake screen; we currently assume 'screen' is always 0 (real)< / span >
< span id = "L82" class = "LineNr" > 82 < / span > 8b/-> *< span class = "SpecialChar" > < a href = '103grapheme.subx.html#L111' > Default-next-x< / a > < / span > 0/r32/eax
< span id = "L83" class = "LineNr" > 83 < / span > 8b/-> *< span class = "SpecialChar" > < a href = '103grapheme.subx.html#L114' > Default-next-y< / a > < / span > 1/r32/ecx
< span id = "L84" class = "LineNr" > 84 < / span > < span class = "Constant" > $cursor-position:end< / span > :
< span id = "L85" class = "LineNr" > 85 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L86" class = "LineNr" > 86 < / span > 89/< - %esp 5/r32/ebp
< span id = "L87" class = "LineNr" > 87 < / span > 5d/pop-to-ebp
< span id = "L88" class = "LineNr" > 88 < / span > c3/return
< span id = "L89" class = "LineNr" > 89 < / span >
< span id = "L90" class = "LineNr" > 90 < / span > < span class = "subxFunction" > set-cursor-position< / span > : < span class = "subxComment" > # screen: (addr screen), x: int, y: int< / span >
< span id = "L91" class = "LineNr" > 91 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L92" class = "LineNr" > 92 < / span > 55/push-ebp
< span id = "L93" class = "LineNr" > 93 < / span > 89/< - %ebp 4/r32/esp
< span id = "L94" class = "LineNr" > 94 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L95" class = "LineNr" > 95 < / span > 50/push-eax
< span id = "L96" class = "LineNr" > 96 < / span > < span class = "subxComment" > # TODO: support fake screen; we currently assume 'screen' is always 0 (real)< / span >
< span id = "L97" class = "LineNr" > 97 < / span > 8b/-> *(ebp+0xc) 0/r32/eax
< span id = "L98" class = "LineNr" > 98 < / span > 89/< - *< span class = "SpecialChar" > < a href = '103grapheme.subx.html#L111' > Default-next-x< / a > < / span > 0/r32/eax
< span id = "L99" class = "LineNr" > 99 < / span > 8b/-> *(ebp+0x10) 0/r32/eax
< span id = "L100" class = "LineNr" > 100 < / span > 89/< - *< span class = "SpecialChar" > < a href = '103grapheme.subx.html#L114' > Default-next-y< / a > < / span > 0/r32/eax
< span id = "L101" class = "LineNr" > 101 < / span > < span class = "Constant" > $set-cursor-position:end< / span > :
< span id = "L102" class = "LineNr" > 102 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L103" class = "LineNr" > 103 < / span > 58/pop-to-eax
< span id = "L104" class = "LineNr" > 104 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L105" class = "LineNr" > 105 < / span > 89/< - %esp 5/r32/ebp
< span id = "L106" class = "LineNr" > 106 < / span > 5d/pop-to-ebp
< span id = "L107" class = "LineNr" > 107 < / span > c3/return
< span id = "L108" class = "LineNr" > 108 < / span >
< span id = "L109" class = "LineNr" > 109 < / span > == data
< span id = "L110" class = "LineNr" > 110 < / span >
< span id = "L111" class = "LineNr" > 111 < / span > < span class = "SpecialChar" > Default-next-x< / span > :
< span id = "L112" class = "LineNr" > 112 < / span > 0/imm32
< span id = "L113" class = "LineNr" > 113 < / span >
< span id = "L114" class = "LineNr" > 114 < / span > < span class = "SpecialChar" > Default-next-y< / span > :
< span id = "L115" class = "LineNr" > 115 < / span > 0/imm32
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