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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Mu - linux/108write.subx</title> <meta name="Generator" content="Vim/8.2"> <meta name="plugin-version" content="vim8.1_v2"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=,use_input_for_pc=fallback"> <meta name="colorscheme" content="minimal-light"> <style>  </style> <script>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/linux/108write.subx'>https://github.com/akkartik/mu/blob/main/linux/108write.subx</a> <pre id='vimCodeElement'> 1 # write: like _write, but also support in-memory streams in addition to file 2 # descriptors. 3 # 4 # Our first dependency-injected and testable primitive. We can pass it either 5 # a file descriptor or an address to a stream. If a file descriptor is passed 6 # in, we _write to it using the right syscall. If a 'fake file descriptor' or 7 # stream is passed in, we append to the stream. This lets us redirect output 8 # in tests and check it later. 9 # 10 # We assume our data segment will never begin at an address shorter than 11 # 0x08000000, so any smaller arguments are assumed to be real file descriptors. 12 # 13 # A stream looks like this: 14 # read: int # index at which to read next 15 # write: int # index at which writes go 16 # data: (array byte) # prefixed by size as usual 17 18 == code 19 # instruction effective address register displacement immediate 20 # . op subop mod rm32 base index scale r32 21 # . 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 22 23 # TODO: come up with a way to signal when a write to disk fails 24 write: # f: fd or (addr stream byte), s: (addr array byte) 25 # . prologue 26 55/push-ebp 27 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp 28 # if (s == 0) return 29 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 0/imm32 # compare *(ebp+12) 30 74/jump-if-= $write:end/disp8 31 # if (f < 0x08000000) _write(f, s) and return # f can't be a user-mode address, so treat it as a kernel file descriptor 32 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 0x08000000/imm32 # compare *(ebp+8) 33 73/jump-if-addr>= $write:fake/disp8 34 # . . push args 35 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) 36 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) 37 # . . call 38 e8/call <a href='101_write.subx.html#L12'>_write</a>/disp32 39 # . . discard args 40 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 41 eb/jump $write:end/disp8 42 $write:fake: 43 # otherwise, treat 'f' as a stream to append to 44 # . save registers 45 50/push-eax 46 51/push-ecx 47 52/push-edx 48 53/push-ebx 49 # ecx = f 50 8b/copy 1/mod/*+disp8 5/rm32/ebp . . 1/r32/ecx 8/disp8 . # copy *(ebp+8) to ecx 51 # edx = f->write 52 8b/copy 0/mod/indirect 1/rm32/ecx . . . 2/r32/edx . . # copy *ecx to edx 53 # ebx = f->size 54 8b/copy 1/mod/*+disp8 1/rm32/ecx . . . 3/r32/ebx 8/disp8 . # copy *(ecx+8) to ebx 55 # eax = _append-3(&f->data[f->write], &f->data[f->size], s) 56 # . . push s 57 ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) 58 # . . push &f->data[f->size] 59 8d/copy-address 1/mod/*+disp8 4/rm32/sib 1/base/ecx 3/index/ebx . 3/r32/ebx 0xc/disp8 . # copy ecx+ebx+12 to ebx 60 53/push-ebx 61 # . . push &f->data[f->write] 62 8d/copy-address 1/mod/*+disp8 4/rm32/sib 1/base/ecx 2/index/edx . 3/r32/ebx 0xc/disp8 . # copy ecx+edx+12 to ebx 63 53/push-ebx 64 # . . call 65 e8/call <a href='107trace.subx.html#L860'>_append-3</a>/disp32 66 # . . discard args 67 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 68 # f->write += eax 69 01/add 0/mod/indirect 1/rm32/ecx . . . 0/r32/eax . . # add eax to *ecx 70 # . restore registers 71 5b/pop-to-ebx 72 5a/pop-to-edx 73 59/pop-to-ecx 74 58/pop-to-eax 75 $write:end: 76 # . epilogue 77 89/copy 3/mod/direct 4/rm32/esp . . . 5/r32/ebp . . # copy ebp to esp 78 5d/pop-to-ebp 79 c3/return 80 81 test-write-single: 82 # clear-stream(_test-stream) 83 # . . push args 84 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32 85 # . . call 86 e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32 87 # . . discard args 88 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 89 # write(_test-stream, "Ab") 90 # . . push args 91 68/push "Ab"/imm32 92 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32 93 # . . call 94 e8/call <a href='108write.subx.html#L24'>write</a>/disp32 95 # . . discard args 96 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 97 # check-ints-equal(*_test-stream->data, 41/A 62/b 00 00, msg) 98 # . . push args 99 68/push "F - test-write-single"/imm32 100 68/push 0x006241/imm32/Ab 101 # . . push *_test-stream->data 102 b8/copy-to-eax <a href='108write.subx.html#L151'>_test-stream</a>/imm32 103 ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . 0xc/disp8 . # push *(eax+12) 104 # . . call 105 e8/call <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32 106 # . . discard args 107 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 108 # end 109 c3/return 110 111 test-write-appends: 112 # clear-stream(_test-stream) 113 # . . push args 114 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32 115 # . . call 116 e8/call <a href='106stream.subx.html#L17'>clear-stream</a>/disp32 117 # . . discard args 118 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 4/imm32 # add to esp 119 # write(_test-stream, "C") 120 # . . push args 121 68/push "C"/imm32 122 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32 123 # . . call 124 e8/call <a href='108write.subx.html#L24'>write</a>/disp32 125 # . . discard args 126 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 127 # write(_test-stream, "D") 128 # . . push args 129 68/push "D"/imm32 130 68/push <a href='108write.subx.html#L151'>_test-stream</a>/imm32 131 # . . call 132 e8/call <a href='108write.subx.html#L24'>write</a>/disp32 133 # . . discard args 134 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp 135 # check-ints-equal(*_test-stream->data, 43/C 44/D 00 00, msg) 136 # . . push args 137 68/push "F - test-write-appends"/imm32 138 68/push 0x00004443/imm32/C-D 139 # . . push *_test-stream->data 140 b8/copy-to-eax <a href='108write.subx.html#L151'>_test-stream</a>/imm32 141 ff 6/subop/push 1/mod/*+disp8 0/rm32/eax . . . . 0xc/disp8 . # push *(eax+12) 142 # . . call 143 e8/call <a href='102test.subx.html#L23'>check-ints-equal</a>/disp32 144 # . . discard args 145 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 0xc/imm32 # add to esp 146 # end 147 c3/return 148 149 == data 150 151 _test-stream: # (stream byte) 152 # current write index 153 0/imm32 154 # current read index 155 0/imm32 156 # size 157 0x10/imm32 158 # data (2 lines x 8 bytes/line) 159 00 00 00 00 00 00 00 00 160 00 00 00 00 00 00 00 00 161 162 # . . vim:nowrap:textwidth=0 </pre> </body> </html>


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