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

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Diffstat (limited to 'html/subx/061read-byte.subx.html')

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html/subx/061read-byte.subx.html

1 files changed, 1 insertions, 1 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 - 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/master/306files.subx'>https://github.com/akkartik/mu/blob/master/306files.subx</a> <pre id='vimCodeElement'> 1 == code 2 3 open: # filename: (addr array byte), write?: boolean, out: (addr handle buffered-file) 4 # hard-coded parameter: file-buffer-size of created buffered-file 5 # . prologue 6 55/push-ebp 7 89/<- %ebp 4/r32/esp 8 # . save registers 9 50/push-eax 10 51/push-ecx 11 52/push-edx 12 53/push-ebx 13 56/push-esi 14 57/push-edi 15 # ecx = filename 16 8b/-> *(ebp+8) 1/r32/ecx 17 # var size/edx: int = filename->length + 1 for the trailing null character 18 8b/-> *ecx 2/r32/edx 19 42/increment-edx 20 # var s/esi: (stream size) 21 29/subtract-from %esp 2/r32/edx 22 52/push-edx # size 23 68/push 0/imm32/read 24 68/push 0/imm32/write 25 89/<- %esi 4/r32/esp 26 # copy filename and a final null character 27 (<a href='106stream.subx.html#L17'>clear-stream</a> %esi) 28 (<a href='108write.subx.html#L24'>write</a> %esi %ecx) 29 # spill edx 30 52/push-edx 31 # var fd/ecx: fd = open(filename) 32 8d/copy-address *(esi+0xc) 3/r32/ebx 33 8b/-> *(ebp+0xc) 1/r32/ecx/flags 34 ba/copy-to-edx 0x180/imm32/permissions 35 e8/call syscall_open/disp32 36 89/<- %ecx 0/r32/eax 37 # restore edx 38 5a/pop-to-edx 39 # allocate a buffered-file 40 (<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 41 # var out-addr/edi: (addr buffered-file) 42 8b/-> *(ebp+0x10) 7/r32/edi 43 (<a href='120allocate.subx.html#L256'>lookup</a> *edi *(edi+4)) # => eax 44 89/<- %edi 0/r32/eax 45 # out-addr->size = 4KB 46 c7 0/subop/copy *(edi+0xc) 0x1000/imm32/file-buffer-size # Stream-size + 4 for fd 47 # out-addr->fd = fd 48 89/<- *edi 1/r32/ecx 49 $open:end: 50 # . reclaim locals 51 01/add-to %esp 2/r32/edx 52 81 0/subop/add %esp 0xc/imm32 53 # . restore registers 54 5f/pop-to-edi 55 5e/pop-to-esi 56 5b/pop-to-ebx 57 5a/pop-to-edx 58 59/pop-to-ecx 59 58/pop-to-eax 60 # . epilogue 61 89/<- %esp 5/r32/ebp 62 5d/pop-to-ebp 63 c3/return </pre> </body> </html>


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