7217 - mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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author	Kartik Agaram <vc@akkartik.com>	2020-11-08 11:31:54 -0800
committer	Kartik Agaram <vc@akkartik.com>	2020-11-08 11:31:54 -0800
commit	148f2c9b65bcb53379d1c6bf7ec1204735bb2393 (patch)
tree	71f9280c97a58a6d72c26474c7c2b7868d3c3df5 /mu-init-test.subx
parent	2be7af86dbbaccf9370a6035b96a9cec57138e2a (diff)
download	mu-148f2c9b65bcb53379d1c6bf7ec1204735bb2393.tar.gz

7217

Diffstat (limited to 'mu-init-test.subx')

0 files changed, 0 insertions, 0 deletions

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - linux/306files.subx</title> <meta name="Generator" content="Vim/8.1"> <meta name="plugin-version" content="vim8.1_v1"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> <meta name="colorscheme" content="minimal-light"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/linux/306files.subx'>https://github.com/akkartik/mu/blob/main/linux/306files.subx</a> <pre id='vimCodeElement'> 1 # Methods for constructing buffered-file objects. 2 # 3 # TODO: There are hard-coded parameters here for buffer sizes. When they 4 # overflow, tracking down what's going on can get hairy. 5 # 6 # HACK: buffered-file stores naked addrs. This is safe because buffered-file 7 # objects are opaque. But still sub-optimal; they'll be harder to reclaim when 8 # we get around to that. 9 10 == code 11 12 open: # filename: (addr array byte), write?: boolean, out: (addr handle buffered-file) 13 # . prologue 14 55/push-ebp 15 89/<- %ebp 4/r32/esp 16 # . save registers 17 50/push-eax 18 51/push-ecx 19 # var new-fd/ecx: fd 20 (<a href='306files.subx.html#L43'>open-fd</a> *(ebp+8) *(ebp+0xc)) # => eax 21 89/<- %ecx 0/r32/eax 22 # if fd < 0 return 23 3d/compare-eax-with 0/imm32 24 7c/jump-if-< $open:end/disp8 25 # allocate a buffered-file 26 (<a href='120allocate.subx.html#L66'>allocate</a> <a href='120allocate.subx.html#L27'>Heap</a> 0x1010 *(ebp+0x10)) # file-buffer-size + 16 for other fields 27 # var out-addr/eax: (addr buffered-file) 28 8b/-> *(ebp+0x10) 0/r32/eax 29 (<a href='120allocate.subx.html#L258'>lookup</a> *eax *(eax+4)) # => eax 30 # out-addr->size = 4KB 31 c7 0/subop/copy *(eax+0xc) 0x1000/imm32/file-buffer-size # Stream-size + 4 for fd 32 # out-addr->fd = fd 33 89/<- *eax 1/r32/ecx 34 $open:end: 35 # . restore registers 36 59/pop-to-ecx 37 58/pop-to-eax 38 # . epilogue 39 89/<- %esp 5/r32/ebp 40 5d/pop-to-ebp 41 c3/return 42 43 open-fd: # filename: (addr array byte), write?: boolean -> result/eax: fd 44 # . prologue 45 55/push-ebp 46 89/<- %ebp 4/r32/esp 47 # . save registers 48 51/push-ecx 49 52/push-edx 50 53/push-ebx 51 56/push-esi 52 # ecx = filename 53 8b/-> *(ebp+8) 1/r32/ecx 54 # var size/edx: int = filename->length + 1 for the trailing null character 55 8b/-> *ecx 2/r32/edx 56 42/increment-edx 57 # var s/esi: (stream size) 58 29/subtract-from %esp 2/r32/edx 59 52/push-edx # size 60 68/push 0/imm32/read 61 68/push 0/imm32/write 62 89/<- %esi 4/r32/esp 63 # copy filename and a final null character 64 (<a href='106stream.subx.html#L17'>clear-stream</a> %esi) 65 (<a href='108write.subx.html#L24'>write</a> %esi %ecx) 66 # spill edx 67 52/push-edx 68 # var fd/eax: fd = open(filename) 69 8d/copy-address *(esi+0xc) 3/r32/ebx 70 8b/-> *(ebp+0xc) 1/r32/ecx/flags 71 ba/copy-to-edx 0x180/imm32/permissions 72 e8/call <a href='000init.subx.html#L35'>syscall_open</a>/disp32 73 # restore edx 74 5a/pop-to-edx 75 $open-fd:end: 76 # . reclaim locals 77 01/add-to %esp 2/r32/edx 78 81 0/subop/add %esp 0xc/imm32 79 # . restore registers 80 5e/pop-to-esi 81 5b/pop-to-ebx 82 5a/pop-to-edx 83 59/pop-to-ecx 84 # . epilogue 85 89/<- %esp 5/r32/ebp 86 5d/pop-to-ebp 87 c3/return 88 89 populate-buffered-file-containing: # contents: (addr array byte), out: (addr handle buffered-file) 90 # . prologue 91 55/push-ebp 92 89/<- %ebp 4/r32/esp 93 # . save registers 94 50/push-eax 95 51/push-ecx 96 56/push-esi 97 57/push-edi 98 # esi = contents 99 8b/-> *(ebp+8) 6/r32/esi 100 # var n/ecx: int = len(contents) 101 8b/-> *esi 1/r32/ecx 102 # var stream/edi: (handle stream byte) 103 68/push 0/imm32 104 68/push 0/imm32 105 89/<- %edi 4/r32/esp 106 # allocate stream 107 (<a href='121new-stream.subx.html#L8'>new-stream</a> <a href='120allocate.subx.html#L27'>Heap</a> %ecx 1 %edi) 108 # var stream-addr/edi: (addr stream byte) = lookup(stream) 109 (<a href='120allocate.subx.html#L258'>lookup</a> *edi *(edi+4)) # => eax 110 89/<- %edi 0/r32/eax 111 # write contents to stream 112 (<a href='108write.subx.html#L24'>write</a> %edi %esi) 113 # allocate buffered-file 114 (<a href='120allocate.subx.html#L66'>allocate</a> <a href='120allocate.subx.html#L27'>Heap</a> 0x110 *(ebp+0xc)) 115 # var out-addr/eax: (addr buffered-file) 116 8b/-> *(ebp+0xc) 0/r32/eax 117 (<a href='120allocate.subx.html#L258'>lookup</a> *eax *(eax+4)) # => eax 118 # out-addr->size = 256 bytes 119 c7 0/subop/copy *(eax+0xc) 0x100/imm32/file-buffer-size 120 # out-addr->fd = stream 121 89/<- *eax 7/r32/edi 122 $populate-buffered-file-containing:end: 123 # . reclaim locals 124 81 0/subop/add %esp 8/imm32 125 # . restore registers 126 5f/pop-to-edi 127 5e/pop-to-esi 128 59/pop-to-ecx 129 58/pop-to-eax 130 # . epilogue 131 89/<- %esp 5/r32/ebp 132 5d/pop-to-ebp 133 c3/return 134 135 new-buffered-file: # out: (addr handle buffered-file) 136 # . prologue 137 55/push-ebp 138 89/<- %ebp 4/r32/esp 139 # . save registers 140 50/push-eax 141 51/push-ecx 142 # var stream/ecx: (handle stream byte) 143 68/push 0/imm32 144 68/push 0/imm32 145 89/<- %ecx 4/r32/esp 146 # allocate stream 147 (<a href='121new-stream.subx.html#L8'>new-stream</a> <a href='120allocate.subx.html#L27'>Heap</a> 0x100 1 %ecx) 148 # var stream-addr/ecx: (addr stream byte) = lookup(stream) 149 (<a href='120allocate.subx.html#L258'>lookup</a> *ecx *(ecx+4)) # => eax 150 89/<- %ecx 0/r32/eax 151 # allocate buffered-file 152 (<a href='120allocate.subx.html#L66'>allocate</a> <a href='120allocate.subx.html#L27'>Heap</a> 0x110 *(ebp+8)) 153 # var out-addr/eax: (addr buffered-file) 154 8b/-> *(ebp+8) 0/r32/eax 155 (<a href='120allocate.subx.html#L258'>lookup</a> *eax *(eax+4)) # => eax 156 # out-addr->size = 256 bytes 157 c7 0/subop/copy *(eax+0xc) 0x100/imm32/file-buffer-size 158 # out-addr->fd = stream 159 89/<- *eax 1/r32/ecx 160 $new-buffered-file:end: 161 # . reclaim locals 162 81 0/subop/add %esp 8/imm32 163 # . restore registers 164 59/pop-to-ecx 165 58/pop-to-eax 166 # . epilogue 167 89/<- %esp 5/r32/ebp 168 5d/pop-to-ebp 169 c3/return </pre> </body> </html>


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