| ofs | hex dump | ascii |
|---|
| 0000 | 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 00 00 03 bd 00 00 01 7f 08 06 00 00 00 85 62 ae | .PNG........IHDR..............b. |
| 0020 | 3a 00 00 18 27 69 43 43 50 49 43 43 20 50 72 6f 66 69 6c 65 00 00 58 85 95 79 07 54 14 4d b3 76 | :...'iCCPICC.Profile..X..y.T.M.v |
| 0040 | cf ce 06 58 96 25 a7 25 e7 24 39 83 e4 9c 73 46 60 c9 39 67 54 a2 48 50 11 04 14 01 15 54 10 54 | ...X.%.%.$9...sF`.9gT.HP.....T.T |
| 0060 | 30 90 44 4c 08 22 8a 08 2a 60 40 24 18 48 2a 28 a0 08 c8 1d 82 be df 7d ef 7f fe 7b 6e 9f d3 33 | 0.DL."..*`@$.H*(.......}...{n..3 |
| 0080 | cf 56 57 57 3f dd 55 dd 33 b5 03 00 3b 2b 39 22 22 04 45 0b 40 68 58 4c 94 8d a1 0e 8f 93 b3 0b | .VWW?.U.3...;+9"".E.@hXL........ |
| 00a0 | 0f 6e 0c a0 00 09 10 91 4a 22 7b 47 47 68 5b 59 99 01 a4 fc b9 ff f7 b2 3c 04 a0 cd fb 73 89 4d | .n......J"{GGh[Y........<....s.M |
| 00c0 | 5b ff b3 fd ff 5b e8 7c 7c a3 bd 01 80 ac 10 ec e5 13 ed 1d 8a e0 46 00 d0 24 ef 88 a8 18 00 30 | [....[.||.............F..$.....0 |
| 00e0 | fd 88 9c 3f 3e 26 62 13 2f 22 98 31 0a 21 08 00 96 62 13 fb 6f 63 8e 4d ec b5 8d a5 b7 74 ec 6c | ...?>&b./".1.!...b..oc.M.....t.l |
| 0100 | 74 11 ac 07 00 05 81 4c 8e f2 07 80 b8 69 9f 27 ce db 1f b1 43 8c 40 da e8 c3 7c 02 c3 10 d5 4c | t......L.....i.'....C.@...|....L |
| 0120 | 04 6b 78 07 90 7d 00 20 75 22 3a bb 42 43 c3 37 f1 3c 82 45 bc fe c3 8e ff 7f b3 e9 f5 d7 26 99 | .kx..}..u":.BC.7.<.E..........&. |
| 0140 | ec ff 17 6f cf 65 ab 50 e8 05 46 47 84 90 13 ff 8f cb f1 bf 97 d0 90 d8 3f 63 f0 21 95 10 10 65 | ...o.e.P..FG............?c.!...e |
| 0160 | 64 b3 39 67 64 dd 2e 04 87 9b 6e 62 02 82 db c3 bc 2c 2c 11 4c 8f e0 87 81 3e 5b fa 9b f8 75 40 | d.9gd.....nb.....,,.L....>[...u@ |
| 0180 | ac 91 fd 8e fe 9c 77 b4 2e b2 66 80 19 20 ee f6 21 eb 99 22 18 59 4b 14 73 6c b0 bd f6 0e 96 25 | ......w...f.....!..".YK.sl.....% |
| 01a0 | 47 6d f5 45 f4 51 16 81 31 c6 76 3b d8 2b 2a dc 66 c7 3e 2a 2e 2c c4 c2 6c c7 4e 76 80 af f1 1f | Gm.E.Q..1.v;.+*.f.>*.,..l.Nv.... |
| 01c0 | 7c ca 37 5a df f6 8f 8e 5f a0 81 31 82 91 48 43 35 26 05 d8 39 6e f3 44 75 c6 05 3a 58 20 98 88 | |.7Z...._..1..HC5&..9n.Du..:X... |
| 01e0 | e0 fe e8 60 5b d3 9d be a3 49 01 ba 16 7f 74 a2 62 6d 36 39 0b 20 78 d1 2f ca c0 66 5b 07 66 0d | ...`[....I....t.bm69..x./..f[.f. |
| 0200 | 8d fe 33 2f 58 d2 9b bc 35 16 2b 82 b5 62 02 ec 8c b6 fb c2 4e be d1 4e 66 7f 38 f8 f8 ea e9 6f | ..3/X...5.+..b......N..Nf.8....o |
| 0220 | 73 80 7d 7c c3 ec 77 b8 c1 48 74 e9 d8 ec f4 cd 8a 08 b1 da d1 87 4f f9 86 18 da 6c af 33 7c 25 | s.}|..w..Ht...........O....l.3|% |
| 0240 | 3a ce f6 4f df 67 31 48 80 6d af 03 3c 11 44 36 b1 da e6 0f 2f 47 c4 58 d9 6d 73 43 a3 81 19 d0 | :..O.g1H.m..<.D6..../G.X.msC.... |
| 0260 | 05 7a 80 07 c4 22 d5 0b 84 83 20 10 d8 37 d7 32 87 fc da 6e 31 00 64 10 05 fc 81 2f 90 d8 91 fc | .z...".......7.2...n1.d..../.... |
| 0280 | e9 e1 b8 d5 12 86 5c 6d 41 12 f8 8c 20 5f 10 fd b7 9f ce 56 ab 2f 88 43 e4 eb 7f a5 db 57 09 e0 | ......\mA...._.....V./.C.....W.. |
| 02a0 | b7 d5 1a b7 d5 23 18 7c 44 70 28 9a 84 d6 40 ab a1 cd 90 ab 16 52 65 d1 ca 68 95 3f fd 78 68 fe | .....#.|Dp(...@......Re..h.?.xh. |
| 02c0 | 8c 8a d5 c7 ea 61 8d b0 06 58 d1 bf 3c bc 11 d6 21 48 8d 02 81 ff 0f 99 29 72 f7 45 66 b7 c9 25 | .....a...X..<...!H......)r.Ef..% |
| 02e0 | ec cf 1c fe b1 87 f9 88 19 c0 4c 60 06 31 63 98 57 c0 01 bc df b2 b2 a3 e5 11 98 1e f5 2f e6 3c | ..........L`.1c.W............/.< |
| 0300 | c0 1c 8c 21 d6 0c 76 66 e7 85 d8 9c fe a3 83 16<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<a href='https://github.com/akkartik/mu/blob/main/104new-segment.subx'>https://github.com/akkartik/mu/blob/main/104new-segment.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Create a new segment (pool of memory for allocating chunks from) in the form</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># of an *allocation descriptor* that can be passed to the memory allocator</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># (defined in a later layer).</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Currently an allocation descriptor consists of just the bounds of the pool of</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment"># available memory:</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment">#</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># curr: address</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># end: address</span>
<span id="L10" class="LineNr">10 </span><span class="subxComment">#</span>
<span id="L11" class="LineNr">11 </span><span class="subxComment"># This isn't enough information to reclaim individual allocations. We can't</span>
<span id="L12" class="LineNr">12 </span><span class="subxComment"># support arbitrary reclamation yet.</span>
<span id="L13" class="LineNr">13 </span>
<span id="L14" class="LineNr">14 </span>== code
<span id="L15" class="LineNr">15 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L16" class="LineNr">16 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L17" class="LineNr">17 </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="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># manual test</span>
<span id="L20" class="LineNr">20 </span> <span class="subxComment"># var ad/ecx: allocation-descriptor</span>
<span id="L21" class="LineNr">21 </span> 68/push 0/imm32/limit
<span id="L22" class="LineNr">22 </span> 68/push 0/imm32/curr
<span id="L23" class="LineNr">23 </span> 89/copy 3/mod/direct 1/rm32/ecx <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 ecx</span>
<span id="L24" class="LineNr">24 </span> <span class="subxComment"># new-segment(0x1000, ad)</span>
<span id="L25" class="LineNr">25 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L26" class="LineNr">26 </span> 51/push-ecx
<span id="L27" class="LineNr">27 </span> 68/push 0x1000/imm32
<span id="L28" class="LineNr">28 </span> <span class="subxS2Comment"># . . call</span>
<span id="L29" class="LineNr">29 </span> e8/call <a href='104new-segment.subx.html#L40'>new-segment</a>/disp32
<span id="L30" class="LineNr">30 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L31" class="LineNr">31 </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="L32" class="LineNr">32 </span> <span class="subxComment"># var eax: (addr _) = ad->curr</span>
<span id="L33" class="LineNr">33 </span> 8b/copy 0/mod/indirect 1/rm32/ecx <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 *ecx to eax</span>
<span id="L34" class="LineNr">34 </span> <span class="subxComment"># write to *eax to check that we have access to the newly-allocated segment</span>
<span id="L35" class="LineNr">35 </span> c7 0/subop/copy 0/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0x34/imm32 <span class="subxComment"># copy to *eax</span>
<span id="L36" class="LineNr">36 </span> <span class="subxComment"># syscall(exit, eax)</span>
<span id="L37" class="LineNr">37 </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="L38" class="LineNr">38 </span> e8/call syscall_exit/disp32
<span id="L39" class="LineNr">39 </span>
<span id="L40" class="LineNr">40 </span><span class="subxFunction">new-segment</span>: <span class="subxComment"># len: int, ad: (addr allocation-descriptor)</span>
<span id="L41" class="LineNr">41 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L42" class="LineNr">42 </span> 55/push-ebp
<span id="L43" class="LineNr">43 </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="L44" class="LineNr">44 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L45" class="LineNr">45 </span> 50/push-eax
<span id="L46" class="LineNr">46 </span> 53/push-ebx
<span id="L47" class="LineNr">47 </span> <span class="subxComment"># copy len to _mmap-new-segment->len</span>
<span id="L48" class="LineNr">48 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to eax</span>
<span id="L49" class="LineNr">49 </span> 89/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax $_mmap-new-segment:len/disp32 <span class="subxComment"># copy eax to *$_mmap-new-segment:len</span>
<span id="L50" class="LineNr">50 </span> <span class="subxComment"># mmap(_mmap-new-segment)</span>
<span id="L51" class="LineNr">51 </span> bb/copy-to-ebx <a href='104new-segment.subx.html#L73'>_mmap-new-segment</a>/imm32
<span id="L52" class="LineNr">52 </span> e8/call syscall_mmap/disp32
<span id="L53" class="LineNr">53 </span> <span class="subxComment"># copy {eax, eax+len} to *ad</span>
<span id="L54" class="LineNr">54 </span> <span class="subxS1Comment"># . ebx = ad</span>
<span id="L55" class="LineNr">55 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+12) to ebx</span>
<span id="L56" class="LineNr">56 </span> <span class="subxS1Comment"># . ad->curr = eax</span>
<span id="L57" class="LineNr">57 </span> 89/copy 0/mod/indirect 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="L58" class="LineNr">58 </span> <span class="subxS1Comment"># . ad->end = eax+len</span>
<span id="L59" class="LineNr">59 </span> 03/add 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># add *(ebp+8) to eax</span>
<span id="L60" class="LineNr">60 </span> 89/copy 1/mod/*+disp8 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy eax to *(ebx+4)</span>
<span id="L61" class="LineNr">61 </span><span class="Constant">$new-segment:end</span>:
<span id="L62" class="LineNr">62 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L63" class="LineNr">63 </span> 5b/pop-to-ebx
<span id="L64" class="LineNr">64 </span> 58/pop-to-eax
<span id="L65" class="LineNr">65 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L66" class="LineNr">66 </span> 89/copy 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 5/r32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ebp to esp</span>
<span id="L67" class="LineNr">67 </span> 5d/pop-to-ebp
<span id="L68" class="LineNr">68 </span> c3/return
<span id="L69" class="LineNr">69 </span>
<span id="L70" class="LineNr">70 </span>== data
<span id="L71" class="LineNr">71 </span>
<span id="L72" class="LineNr">72 </span><span class="subxComment"># various constants used here were found in the Linux sources (search for file mman-common.h)</span>
<span id="L73" class="LineNr">73 </span><span class="subxMinorFunction">_mmap-new-segment</span>: <span class="subxComment"># mmap_arg_struct</span>
<span id="L74" class="LineNr">74 </span> <span class="subxComment"># addr</span>
<span id="L75" class="LineNr">75 </span> 0/imm32
<span id="L76" class="LineNr">76 </span><span class="Constant">$_mmap-new-segment:len</span>:
<span id="L77" class="LineNr">77 </span> <span class="subxComment"># len</span>
<span id="L78" class="LineNr">78 </span> 0/imm32
<span id="L79" class="LineNr">79 </span> <span class="subxComment"># protection flags</span>
<span id="L80" class="LineNr">80 </span> 3/imm32 <span class="subxComment"># PROT_READ | PROT_WRITE</span>
<span id="L81" class="LineNr">81 </span> <span class="subxComment"># sharing flags</span>
<span id="L82" class="LineNr">82 </span> 0x22/imm32 <span class="subxComment"># MAP_PRIVATE | MAP_ANONYMOUS</span>
<span id="L83" class="LineNr">83 </span> <span class="subxComment"># fd</span>
<span id="L84" class="LineNr">84 </span> -1/imm32 <span class="subxComment"># since MAP_ANONYMOUS is specified</span>
<span id="L85" class="LineNr">85 </span> <span class="subxComment"># offset</span>
<span id="L86" class="LineNr">86 </span> 0/imm32 <span class="subxComment"># since MAP_ANONYMOUS is specified</span>
<span id="L87" class="LineNr">87 </span>
<span id="L88" class="LineNr">88 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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