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< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > # read: analogously to write, support reading from in-memory streams in< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "subxComment" > # addition to file descriptors.< / span >
< span id = "L3" class = "LineNr" > 3 < / span > < span class = "subxComment" > #< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "subxComment" > # We can pass it either a file descriptor or an address to a stream. If a< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "subxComment" > # file descriptor is passed in, we _read from it using the right syscall. If a< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxComment" > # stream is passed in (a fake file descriptor), we read from it instead. This< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "subxComment" > # lets us initialize input for tests.< / span >
< span id = "L8" class = "LineNr" > 8 < / span > < span class = "subxComment" > #< / span >
< span id = "L9" class = "LineNr" > 9 < / span > < span class = "subxComment" > # A little counter-intuitively, the output of 'read' ends up in.. a stream. So< / span >
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "subxComment" > # tests end up doing a redundant copy. Why? Well, consider the alternatives:< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "subxComment" > #< / span >
< span id = "L12" class = "LineNr" > 12 < / span > < span class = "subxComment" > # a) Reading into a string, and returning a pointer to the end of the read< / span >
< span id = "L13" class = "LineNr" > 13 < / span > < span class = "subxComment" > # region, or a count of bytes written. Now this count or end pointer must be< / span >
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "subxComment" > # managed separately by the caller, which can be error-prone.< / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "subxComment" > #< / span >
< span id = "L16" class = "LineNr" > 16 < / span > < span class = "subxComment" > # b) Having 'read' return a buffer that it allocates. But there's no way to< / span >
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "subxComment" > # know in advance how large to make the buffer. If you read less than the< / span >
< span id = "L18" class = "LineNr" > 18 < / span > < span class = "subxComment" > # size of the buffer you again end up needing to manage initialized vs< / span >
< span id = "L19" class = "LineNr" > 19 < / span > < span class = "subxComment" > # uninitialized memory.< / span >
< span id = "L20" class = "LineNr" > 20 < / span > < span class = "subxComment" > #< / span >
< span id = "L21" class = "LineNr" > 21 < / span > < span class = "subxComment" > # c) Creating more helpful variants like 'read-byte' or 'read-until' which< / span >
< span id = "L22" class = "LineNr" > 22 < / span > < span class = "subxComment" > # also can take a file descriptor or stream, just like 'write'. But such< / span >
< span id = "L23" class = "LineNr" > 23 < / span > < span class = "subxComment" > # primitives don't exist in the Linux kernel, so we'd be implementing them< / span >
< span id = "L24" class = "LineNr" > 24 < / span > < span class = "subxComment" > # somehow, either with more internal buffering or by making multiple< / span >
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "subxComment" > # syscalls.< / span >
< span id = "L26" class = "LineNr" > 26 < / span > < span class = "subxComment" > #< / span >
< span id = "L27" class = "LineNr" > 27 < / span > < span class = "subxComment" > # Reading into a stream avoids these problems. The buffer is externally< / span >
< span id = "L28" class = "LineNr" > 28 < / span > < span class = "subxComment" > # provided and the caller has control over where it's allocated, its lifetime,< / span >
< span id = "L29" class = "LineNr" > 29 < / span > < span class = "subxComment" > # and so on. The buffer's read and write pointers are internal to it so it's< / span >
< span id = "L30" class = "LineNr" > 30 < / span > < span class = "subxComment" > # easier to keep in a consistent state. And it can now be passed directly to< / span >
< span id = "L31" class = "LineNr" > 31 < / span > < span class = "subxComment" > # helpers like 'read-byte' or 'read-until' that only need to support streams,< / span >
< span id = "L32" class = "LineNr" > 32 < / span > < span class = "subxComment" > # never file descriptors.< / span >
< span id = "L33" class = "LineNr" > 33 < / span > < span class = "subxComment" > #< / span >
< span id = "L34" class = "LineNr" > 34 < / span > < span class = "subxComment" > # Like with 'write', we assume our data segment will never begin at an address< / span >
< span id = "L35" class = "LineNr" > 35 < / span > < span class = "subxComment" > # shorter than 0x08000000, so any smaller arguments are assumed to be real< / span >
< span id = "L36" class = "LineNr" > 36 < / span > < span class = "subxComment" > # file descriptors.< / span >
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "subxComment" > #< / span >
< span id = "L38" class = "LineNr" > 38 < / span > < span class = "subxComment" > # As a reminder, a stream looks like this:< / span >
< span id = "L39" class = "LineNr" > 39 < / span > < span class = "subxComment" > # write: int # index at which to write to next< / span >
< span id = "L40" class = "LineNr" > 40 < / span > < span class = "subxComment" > # read: int # index at which to read next< / span >
< span id = "L41" class = "LineNr" > 41 < / span > < span class = "subxComment" > # data: (array byte) # prefixed by length as usual< / span >
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< span id = "L42" class = "LineNr" > 42 < / span >
< span id = "L43" class = "LineNr" > 43 < / span > == code
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< span id = "L44" class = "LineNr" > 44 < / span > < span class = "subxComment" > # instruction effective address operand displacement immediate< / span >
< span id = "L45" class = "LineNr" > 45 < / span > < span class = "subxComment" > # op subop mod rm32 base index scale r32< / span >
< span id = "L46" class = "LineNr" > 46 < / span > < span class = "subxComment" > # 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 >
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< span id = "L47" class = "LineNr" > 47 < / span >
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< span id = "L48" class = "LineNr" > 48 < / span > < span class = "subxComment" > # main:< / span >
< span id = "L49" class = "LineNr" > 49 < / span > e8/call run-tests/disp32 < span class = "subxComment" > # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.< / span >
< span id = "L50" class = "LineNr" > 50 < / span > < span class = "subxComment" > # syscall(exit, Num-test-failures)< / span >
< span id = "L51" class = "LineNr" > 51 < / span > 8b/copy 0/mod/indirect 5/rm32/.disp32 < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 3/r32/EBX < span class = "Special" > Num-test-failures< / span > /disp32 < span class = "subxComment" > # copy *Num-test-failures to EBX< / span >
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< span id = "L52" class = "LineNr" > 52 < / span > b8/copy-to-EAX 1/imm32
< span id = "L53" class = "LineNr" > 53 < / span > cd/syscall 0x80/imm8
< span id = "L54" class = "LineNr" > 54 < / span >
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< span id = "L55" class = "LineNr" > 55 < / span > read: < span class = "subxComment" > # f : fd or (address stream), s : (address stream) -> num-bytes-read/EAX< / span >
< span id = "L56" class = "LineNr" > 56 < / span > < span class = "subxComment" > # prolog< / span >
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< span id = "L57" class = "LineNr" > 57 < / span > 55/push-EBP
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< span id = "L58" class = "LineNr" > 58 < / span > 89/copy 3/mod/direct 5/rm32/EBP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/r32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy ESP to EBP< / span >
< span id = "L59" class = "LineNr" > 59 < / span > < span class = "subxComment" > ## if (f < 0x08000000) return _read(f, s) # f can't be a user-mode address, so treat it as a kernel file descriptor< / span >
< span id = "L60" class = "LineNr" > 60 < / span > 81 7/subop/compare 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/disp8 0x08000000/imm32 < span class = "subxComment" > # compare *(EBP+8)< / span >
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< span id = "L61" class = "LineNr" > 61 < / span > 7d/jump-if-greater-or-equal $read:fake/disp8
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< span id = "L62" class = "LineNr" > 62 < / span > < span class = "subxComment" > # push args< / span >
< span id = "L63" class = "LineNr" > 63 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # push *(EBP+12)< / span >
< span id = "L64" class = "LineNr" > 64 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # push *(EBP+8)< / span >
< span id = "L65" class = "LineNr" > 65 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L66" class = "LineNr" > 66 < / span > e8/call _read/disp32
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< span id = "L67" class = "LineNr" > 67 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L68" class = "LineNr" > 68 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L69" class = "LineNr" > 69 < / span > < span class = "subxComment" > # return< / span >
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< span id = "L70" class = "LineNr" > 70 < / span > eb/jump $read:end/disp8
< span id = "L71" class = "LineNr" > 71 < / span > $read:fake:
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< span id = "L72" class = "LineNr" > 72 < / span > < span class = "subxComment" > ## otherwise, treat 'f' as a stream to scan from< / span >
< span id = "L73" class = "LineNr" > 73 < / span > < span class = "subxComment" > # save registers< / span >
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< span id = "L74" class = "LineNr" > 74 < / span > 56/push-ESI
< span id = "L75" class = "LineNr" > 75 < / span > 57/push-EDI
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< span id = "L76" class = "LineNr" > 76 < / span > < span class = "subxComment" > # ESI = f< / span >
< span id = "L77" class = "LineNr" > 77 < / span > 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > 6/r32/ESI 8/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(EBP+8) to ESI< / span >
< span id = "L78" class = "LineNr" > 78 < / span > < span class = "subxComment" > # EDI = s< / span >
< span id = "L79" class = "LineNr" > 79 < / span > 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > 7/r32/EDI 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(EBP+12) to ESI< / span >
< span id = "L80" class = "LineNr" > 80 < / span > < span class = "subxComment" > # EAX = _append-4(out = & s-> data[s-> write], outend = & s-> data[s-> length],< / span >
< span id = "L81" class = "LineNr" > 81 < / span > < span class = "subxComment" > # in = & f-> data[f-> read], inend = & f-> data[f-> write])< / span >
< span id = "L82" class = "LineNr" > 82 < / span > < span class = "subxComment" > # push & f-> data[f-> write]< / span >
< span id = "L83" class = "LineNr" > 83 < / span > 8b/copy 0/mod/indirect 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *ESI to EAX< / span >
< span id = "L84" class = "LineNr" > 84 < / span > 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 0/index/EAX < span class = "CommentedCode" > . < / span > 0/r32/EAX 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy ESI+EAX+12 to EAX< / span >
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< span id = "L85" class = "LineNr" > 85 < / span > 50/push-EAX
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< span id = "L86" class = "LineNr" > 86 < / span > < span class = "subxComment" > # push & f-> data[f-> read]< / span >
< span id = "L87" class = "LineNr" > 87 < / span > 8b/copy 1/mod/*+disp8 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX 4/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(ESI+4) to EAX< / span >
< span id = "L88" class = "LineNr" > 88 < / span > 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 0/index/EAX < span class = "CommentedCode" > . < / span > 0/r32/EAX 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy ESI+EAX+12 to EAX< / span >
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< span id = "L89" class = "LineNr" > 89 < / span > 50/push-EAX
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< span id = "L90" class = "LineNr" > 90 < / span > < span class = "subxComment" > # push & s-> data[s-> length]< / span >
< span id = "L91" class = "LineNr" > 91 < / span > 8b/copy 1/mod/*+disp8 7/rm32/EDI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX 8/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(EDI+8) to EAX< / span >
< span id = "L92" class = "LineNr" > 92 < / span > 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 0/index/EAX < span class = "CommentedCode" > . < / span > 0/r32/EAX 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy EDI+EAX+12 to EAX< / span >
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< span id = "L93" class = "LineNr" > 93 < / span > 50/push-EAX
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< span id = "L94" class = "LineNr" > 94 < / span > < span class = "subxComment" > # push & s-> data[s-> write]< / span >
< span id = "L95" class = "LineNr" > 95 < / span > 8b/copy 0/mod/indirect 7/rm32/EDI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *EDI to EAX< / span >
< span id = "L96" class = "LineNr" > 96 < / span > 8d/copy-address 1/mod/*+disp8 4/rm32/sib 7/base/EDI 0/index/EAX < span class = "CommentedCode" > . < / span > 0/r32/EAX 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy EDI+EAX+12 to EAX< / span >
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< span id = "L97" class = "LineNr" > 97 < / span > 50/push-EAX
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< span id = "L98" class = "LineNr" > 98 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L99" class = "LineNr" > 99 < / span > e8/call _append-4/disp32
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< span id = "L100" class = "LineNr" > 100 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L101" class = "LineNr" > 101 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0x10/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L102" class = "LineNr" > 102 < / span > < span class = "subxComment" > # s-> write += EAX< / span >
< span id = "L103" class = "LineNr" > 103 < / span > 01/add 0/mod/indirect 7/rm32/EDI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # add EAX to *EDI< / span >
< span id = "L104" class = "LineNr" > 104 < / span > < span class = "subxComment" > # f.read += EAX< / span >
< span id = "L105" class = "LineNr" > 105 < / span > 01/add 1/mod/*+disp8 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX 4/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # add EAX to *(ESI+4)< / span >
< span id = "L106" class = "LineNr" > 106 < / span > < span class = "subxComment" > # restore registers< / span >
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< span id = "L107" class = "LineNr" > 107 < / span > 5f/pop-to-EDI
< span id = "L108" class = "LineNr" > 108 < / span > 5e/pop-to-ESI
< span id = "L109" class = "LineNr" > 109 < / span > $read:end:
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< span id = "L110" class = "LineNr" > 110 < / span > < span class = "subxComment" > # epilog< / span >
< span id = "L111" class = "LineNr" > 111 < / span > 89/copy 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 5/r32/EBP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy EBP to ESP< / span >
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< span id = "L112" class = "LineNr" > 112 < / span > 5d/pop-to-EBP
< span id = "L113" class = "LineNr" > 113 < / span > c3/return
< span id = "L114" class = "LineNr" > 114 < / span >
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< span id = "L115" class = "LineNr" > 115 < / span > < span class = "subxComment" > ## helpers< / span >
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< span id = "L116" class = "LineNr" > 116 < / span >
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< span id = "L117" class = "LineNr" > 117 < / span > < span class = "subxComment" > # idea: a clear-if-empty method on streams that clears only if f.read == f.write< / span >
< span id = "L118" class = "LineNr" > 118 < / span > < span class = "subxComment" > # Unclear how I'd use it, though. Callers seem to need the check anyway.< / span >
< span id = "L119" class = "LineNr" > 119 < / span > < span class = "subxComment" > # Maybe a better helper would be 'empty-stream?'< / span >
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< span id = "L120" class = "LineNr" > 120 < / span >
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< span id = "L121" class = "LineNr" > 121 < / span > _read: < span class = "subxComment" > # fd : int, s : (address stream) -> num-bytes-read/EAX< / span >
< span id = "L122" class = "LineNr" > 122 < / span > < span class = "subxComment" > # prolog< / span >
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< span id = "L123" class = "LineNr" > 123 < / span > 55/push-EBP
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< span id = "L124" class = "LineNr" > 124 < / span > 89/copy 3/mod/direct 5/rm32/EBP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/r32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy ESP to EBP< / span >
< span id = "L125" class = "LineNr" > 125 < / span > < span class = "subxComment" > # save registers< / span >
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< span id = "L126" class = "LineNr" > 126 < / span > 51/push-ECX
< span id = "L127" class = "LineNr" > 127 < / span > 52/push-EDX
< span id = "L128" class = "LineNr" > 128 < / span > 53/push-EBX
< span id = "L129" class = "LineNr" > 129 < / span > 56/push-ESI
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< span id = "L130" class = "LineNr" > 130 < / span > < span class = "subxComment" > # ESI = s< / span >
< span id = "L131" class = "LineNr" > 131 < / span > 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > 6/r32/ESI 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(EBP+12) to ESI< / span >
< span id = "L132" class = "LineNr" > 132 < / span > < span class = "subxComment" > # EAX = s-> write< / span >
< span id = "L133" class = "LineNr" > 133 < / span > 8b/copy 0/mod/indirect 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *ESI to EAX< / span >
< span id = "L134" class = "LineNr" > 134 < / span > < span class = "subxComment" > # EDX = s-> length< / span >
< span id = "L135" class = "LineNr" > 135 < / span > 8b/copy 1/mod/*+disp8 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 2/r32/EDX 8/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(ESI+8) to EDX< / span >
< span id = "L136" class = "LineNr" > 136 < / span > < span class = "subxComment" > # syscall(read, fd, & s-> data[s-> write], s-> length - s-> write)< / span >
< span id = "L137" class = "LineNr" > 137 < / span > < span class = "subxComment" > # fd : EBX< / span >
< span id = "L138" class = "LineNr" > 138 < / span > 8b/copy 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "CommentedCode" > . < / span > 3/r32/EBX 8/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy *(EBP+8) to EBX< / span >
< span id = "L139" class = "LineNr" > 139 < / span > < span class = "subxComment" > # data : ECX = & s-> data[s-> write]< / span >
< span id = "L140" class = "LineNr" > 140 < / span > 8d/copy-address 1/mod/*+disp8 4/rm32/sib 6/base/ESI 0/index/EAX < span class = "CommentedCode" > . < / span > 1/r32/ECX 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy ESI+EAX+12 to ECX< / span >
< span id = "L141" class = "LineNr" > 141 < / span > < span class = "subxComment" > # size : EDX = s-> length - s-> write< / span >
< span id = "L142" class = "LineNr" > 142 < / span > 29/subtract 3/mod/direct 2/rm32/EDX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # subtract EAX from EDX< / span >
< span id = "L143" class = "LineNr" > 143 < / span > < span class = "subxComment" > # syscall< / span >
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< span id = "L144" class = "LineNr" > 144 < / span > b8/copy-to-EAX 3/imm32/read
< span id = "L145" class = "LineNr" > 145 < / span > cd/syscall 0x80/imm8
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< span id = "L146" class = "LineNr" > 146 < / span > < span class = "subxComment" > # add the result EAX to s-> write< / span >
< span id = "L147" class = "LineNr" > 147 < / span > 01/add 0/mod/indirect 6/rm32/ESI < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0/r32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # add EAX to *ESI< / span >
< span id = "L148" class = "LineNr" > 148 < / span > < span class = "subxComment" > # restore registers< / span >
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< span id = "L149" class = "LineNr" > 149 < / span > 5e/pop-to-ESI
< span id = "L150" class = "LineNr" > 150 < / span > 5b/pop-to-EBX
< span id = "L151" class = "LineNr" > 151 < / span > 5a/pop-to-EDX
< span id = "L152" class = "LineNr" > 152 < / span > 59/pop-to-ECX
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< span id = "L153" class = "LineNr" > 153 < / span > < span class = "subxComment" > # epilog< / span >
< span id = "L154" class = "LineNr" > 154 < / span > 89/copy 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 5/r32/EBP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # copy EBP to ESP< / span >
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< span id = "L155" class = "LineNr" > 155 < / span > 5d/pop-to-EBP
< span id = "L156" class = "LineNr" > 156 < / span > c3/return
< span id = "L157" class = "LineNr" > 157 < / span >
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< span id = "L158" class = "LineNr" > 158 < / span > < span class = "subxComment" > # Two options:< / span >
< span id = "L159" class = "LineNr" > 159 < / span > < span class = "subxComment" > # 1 (what we have above):< / span >
< span id = "L160" class = "LineNr" > 160 < / span > < span class = "subxComment" > # ECX = s< / span >
< span id = "L161" class = "LineNr" > 161 < / span > < span class = "subxComment" > # EAX = s-> write< / span >
< span id = "L162" class = "LineNr" > 162 < / span > < span class = "subxComment" > # EDX = s-> length< / span >
< span id = "L163" class = "LineNr" > 163 < / span > < span class = "subxComment" > # # syscall< / span >
< span id = "L164" class = "LineNr" > 164 < / span > < span class = "subxComment" > # ECX = lea ECX+EAX+12< / span >
< span id = "L165" class = "LineNr" > 165 < / span > < span class = "subxComment" > # EDX = sub EDX EAX< / span >
< span id = "L166" class = "LineNr" > 166 < / span > < span class = "subxComment" > #< / span >
< span id = "L167" class = "LineNr" > 167 < / span > < span class = "subxComment" > # 2:< / span >
< span id = "L168" class = "LineNr" > 168 < / span > < span class = "subxComment" > # ECX = s< / span >
< span id = "L169" class = "LineNr" > 169 < / span > < span class = "subxComment" > # EDX = s-> length< / span >
< span id = "L170" class = "LineNr" > 170 < / span > < span class = "subxComment" > # ECX = & s-> data< / span >
< span id = "L171" class = "LineNr" > 171 < / span > < span class = "subxComment" > # # syscall< / span >
< span id = "L172" class = "LineNr" > 172 < / span > < span class = "subxComment" > # ECX = add ECX, s-> write< / span >
< span id = "L173" class = "LineNr" > 173 < / span > < span class = "subxComment" > # EDX = sub EDX, s-> write< / span >
< span id = "L174" class = "LineNr" > 174 < / span > < span class = "subxComment" > #< / span >
< span id = "L175" class = "LineNr" > 175 < / span > < span class = "subxComment" > # Not much to choose between the two? Option 2 performs a duplicate load to< / span >
< span id = "L176" class = "LineNr" > 176 < / span > < span class = "subxComment" > # use one less register, but doesn't increase the amount of spilling (ECX< / span >
< span id = "L177" class = "LineNr" > 177 < / span > < span class = "subxComment" > # and EDX must be used, and EAX must be clobbered anyway).< / span >
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< span id = "L178" class = "LineNr" > 178 < / span >
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< span id = "L179" class = "LineNr" > 179 < / span > < span class = "subxComment" > ## tests< / span >
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< span id = "L180" class = "LineNr" > 180 < / span >
< span id = "L181" class = "LineNr" > 181 < / span > test-read-single:
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< span id = "L182" class = "LineNr" > 182 < / span > < span class = "subxComment" > # clear-stream(_test-stream)< / span >
< span id = "L183" class = "LineNr" > 183 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L184" class = "LineNr" > 184 < / span > 68/push _test-stream/imm32
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< span id = "L185" class = "LineNr" > 185 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L186" class = "LineNr" > 186 < / span > e8/call clear-stream/disp32
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< span id = "L187" class = "LineNr" > 187 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L188" class = "LineNr" > 188 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L189" class = "LineNr" > 189 < / span > < span class = "subxComment" > # clear-stream(_test-stream-buffer)< / span >
< span id = "L190" class = "LineNr" > 190 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L191" class = "LineNr" > 191 < / span > 68/push _test-stream-buffer/imm32
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< span id = "L192" class = "LineNr" > 192 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L193" class = "LineNr" > 193 < / span > e8/call clear-stream/disp32
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< span id = "L194" class = "LineNr" > 194 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L195" class = "LineNr" > 195 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L196" class = "LineNr" > 196 < / span > < span class = "subxComment" > # write(_test-stream, " Ab" )< / span >
< span id = "L197" class = "LineNr" > 197 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L198" class = "LineNr" > 198 < / span > 68/push < span class = "Constant" > " Ab" < / span > /imm32
< span id = "L199" class = "LineNr" > 199 < / span > 68/push _test-stream/imm32
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< span id = "L200" class = "LineNr" > 200 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L201" class = "LineNr" > 201 < / span > e8/call write/disp32
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< span id = "L202" class = "LineNr" > 202 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L203" class = "LineNr" > 203 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L204" class = "LineNr" > 204 < / span > < span class = "subxComment" > # read(_test-stream, _test-stream-buffer)< / span >
< span id = "L205" class = "LineNr" > 205 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L206" class = "LineNr" > 206 < / span > 68/push _test-stream-buffer/imm32
< span id = "L207" class = "LineNr" > 207 < / span > 68/push _test-stream/imm32
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< span id = "L208" class = "LineNr" > 208 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L209" class = "LineNr" > 209 < / span > e8/call read/disp32
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< span id = "L210" class = "LineNr" > 210 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L211" class = "LineNr" > 211 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L212" class = "LineNr" > 212 < / span > < span class = "subxComment" > # check-ints-equal(EAX, 2)< / span >
< span id = "L213" class = "LineNr" > 213 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L214" class = "LineNr" > 214 < / span > 68/push < span class = "Constant" > " F - test-read-single: return EAX" < / span > /imm32
< span id = "L215" class = "LineNr" > 215 < / span > 68/push 2/imm32
< span id = "L216" class = "LineNr" > 216 < / span > 50/push-EAX
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< span id = "L217" class = "LineNr" > 217 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L218" class = "LineNr" > 218 < / span > e8/call check-ints-equal/disp32
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< span id = "L219" class = "LineNr" > 219 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L220" class = "LineNr" > 220 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L221" class = "LineNr" > 221 < / span > < span class = "subxComment" > # check-ints-equal(*_test-stream-buffer-> data, 41/A 62/b 00 00, msg)< / span >
< span id = "L222" class = "LineNr" > 222 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L223" class = "LineNr" > 223 < / span > 68/push < span class = "Constant" > " F - test-read-single" < / span > /imm32
< span id = "L224" class = "LineNr" > 224 < / span > 68/push 0x006241/imm32/< span class = "Special" > Ab< / span >
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< span id = "L225" class = "LineNr" > 225 < / span > < span class = "subxComment" > # push *_test-stream-buffer-> data< / span >
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< span id = "L226" class = "LineNr" > 226 < / span > b8/copy-to-EAX _test-stream-buffer/imm32
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< span id = "L227" class = "LineNr" > 227 < / span > ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # push *(EAX+12)< / span >
< span id = "L228" class = "LineNr" > 228 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L229" class = "LineNr" > 229 < / span > e8/call check-ints-equal/disp32
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< span id = "L230" class = "LineNr" > 230 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L231" class = "LineNr" > 231 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L232" class = "LineNr" > 232 < / span > < span class = "subxComment" > # end< / span >
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< span id = "L233" class = "LineNr" > 233 < / span > c3/return
< span id = "L234" class = "LineNr" > 234 < / span >
< span id = "L235" class = "LineNr" > 235 < / span > test-read-is-stateful:
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< span id = "L236" class = "LineNr" > 236 < / span > < span class = "subxComment" > ## make two consecutive reads, check that their results are appended< / span >
< span id = "L237" class = "LineNr" > 237 < / span > < span class = "subxComment" > # clear-stream(_test-stream)< / span >
< span id = "L238" class = "LineNr" > 238 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L239" class = "LineNr" > 239 < / span > 68/push _test-stream/imm32
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< span id = "L240" class = "LineNr" > 240 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L241" class = "LineNr" > 241 < / span > e8/call clear-stream/disp32
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< span id = "L242" class = "LineNr" > 242 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L243" class = "LineNr" > 243 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L244" class = "LineNr" > 244 < / span > < span class = "subxComment" > # clear-stream(_test-stream-buffer)< / span >
< span id = "L245" class = "LineNr" > 245 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L246" class = "LineNr" > 246 < / span > 68/push _test-stream-buffer/imm32
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< span id = "L247" class = "LineNr" > 247 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L248" class = "LineNr" > 248 < / span > e8/call clear-stream/disp32
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< span id = "L249" class = "LineNr" > 249 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L250" class = "LineNr" > 250 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L251" class = "LineNr" > 251 < / span > < span class = "subxComment" > # write(_test-stream, " C" )< / span >
< span id = "L252" class = "LineNr" > 252 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L253" class = "LineNr" > 253 < / span > 68/push < span class = "Constant" > " C" < / span > /imm32
< span id = "L254" class = "LineNr" > 254 < / span > 68/push _test-stream/imm32
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< span id = "L255" class = "LineNr" > 255 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L256" class = "LineNr" > 256 < / span > e8/call write/disp32
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< span id = "L257" class = "LineNr" > 257 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L258" class = "LineNr" > 258 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L259" class = "LineNr" > 259 < / span > < span class = "subxComment" > # read(_test-stream, _test-stream-buffer)< / span >
< span id = "L260" class = "LineNr" > 260 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L261" class = "LineNr" > 261 < / span > 68/push _test-stream-buffer/imm32
< span id = "L262" class = "LineNr" > 262 < / span > 68/push _test-stream/imm32
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< span id = "L263" class = "LineNr" > 263 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L264" class = "LineNr" > 264 < / span > e8/call read/disp32
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< span id = "L265" class = "LineNr" > 265 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L266" class = "LineNr" > 266 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L267" class = "LineNr" > 267 < / span > < span class = "subxComment" > # write(_test-stream, " D" )< / span >
< span id = "L268" class = "LineNr" > 268 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L269" class = "LineNr" > 269 < / span > 68/push < span class = "Constant" > " D" < / span > /imm32
< span id = "L270" class = "LineNr" > 270 < / span > 68/push _test-stream/imm32
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< span id = "L271" class = "LineNr" > 271 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L272" class = "LineNr" > 272 < / span > e8/call write/disp32
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< span id = "L273" class = "LineNr" > 273 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L274" class = "LineNr" > 274 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L275" class = "LineNr" > 275 < / span > < span class = "subxComment" > # read(_test-stream, _test-stream-buffer)< / span >
< span id = "L276" class = "LineNr" > 276 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L277" class = "LineNr" > 277 < / span > 68/push _test-stream-buffer/imm32
< span id = "L278" class = "LineNr" > 278 < / span > 68/push _test-stream/imm32
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< span id = "L279" class = "LineNr" > 279 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L280" class = "LineNr" > 280 < / span > e8/call read/disp32
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< span id = "L281" class = "LineNr" > 281 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L282" class = "LineNr" > 282 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L283" class = "LineNr" > 283 < / span > < span class = "subxComment" > # check-ints-equal(*_test-stream-buffer-> data, 43/C 44/D 00 00, msg)< / span >
< span id = "L284" class = "LineNr" > 284 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L285" class = "LineNr" > 285 < / span > 68/push < span class = "Constant" > " F - test-read-is-stateful" < / span > /imm32
< span id = "L286" class = "LineNr" > 286 < / span > 68/push 0x00004443/imm32/C-D
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< span id = "L287" class = "LineNr" > 287 < / span > < span class = "subxComment" > # push *_test-stream-buffer-> data< / span >
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< span id = "L288" class = "LineNr" > 288 < / span > b8/copy-to-EAX _test-stream-buffer/imm32
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< span id = "L289" class = "LineNr" > 289 < / span > ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/disp8 < span class = "CommentedCode" > . < / span > < span class = "subxComment" > # push *(EAX+12)< / span >
< span id = "L290" class = "LineNr" > 290 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L291" class = "LineNr" > 291 < / span > e8/call check-ints-equal/disp32
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< span id = "L292" class = "LineNr" > 292 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L293" class = "LineNr" > 293 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L294" class = "LineNr" > 294 < / span > < span class = "subxComment" > # end< / span >
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< span id = "L295" class = "LineNr" > 295 < / span > c3/return
< span id = "L296" class = "LineNr" > 296 < / span >
< span id = "L297" class = "LineNr" > 297 < / span > test-read-returns-0-on-end-of-file:
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< span id = "L298" class = "LineNr" > 298 < / span > < span class = "subxComment" > ## read after hitting end-of-file, check that result is 0< / span >
< span id = "L299" class = "LineNr" > 299 < / span > < span class = "subxComment" > # clear-stream(_test-stream)< / span >
< span id = "L300" class = "LineNr" > 300 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L301" class = "LineNr" > 301 < / span > 68/push _test-stream/imm32
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< span id = "L302" class = "LineNr" > 302 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L303" class = "LineNr" > 303 < / span > e8/call clear-stream/disp32
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< span id = "L304" class = "LineNr" > 304 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L305" class = "LineNr" > 305 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L306" class = "LineNr" > 306 < / span > < span class = "subxComment" > # clear-stream(_test-stream-buffer)< / span >
< span id = "L307" class = "LineNr" > 307 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L308" class = "LineNr" > 308 < / span > 68/push _test-stream-buffer/imm32
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< span id = "L309" class = "LineNr" > 309 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L310" class = "LineNr" > 310 < / span > e8/call clear-stream/disp32
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< span id = "L311" class = "LineNr" > 311 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L312" class = "LineNr" > 312 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 4/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L313" class = "LineNr" > 313 < / span > < span class = "subxComment" > # write(_test-stream, " Ab" )< / span >
< span id = "L314" class = "LineNr" > 314 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L315" class = "LineNr" > 315 < / span > 68/push < span class = "Constant" > " Ab" < / span > /imm32
< span id = "L316" class = "LineNr" > 316 < / span > 68/push _test-stream/imm32
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< span id = "L317" class = "LineNr" > 317 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L318" class = "LineNr" > 318 < / span > e8/call write/disp32
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< span id = "L319" class = "LineNr" > 319 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L320" class = "LineNr" > 320 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L321" class = "LineNr" > 321 < / span > < span class = "subxComment" > ## first read gets to end-of-file< / span >
< span id = "L322" class = "LineNr" > 322 < / span > < span class = "subxComment" > # read(_test-stream, _test-stream-buffer)< / span >
< span id = "L323" class = "LineNr" > 323 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L324" class = "LineNr" > 324 < / span > 68/push _test-stream-buffer/imm32
< span id = "L325" class = "LineNr" > 325 < / span > 68/push _test-stream/imm32
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< span id = "L326" class = "LineNr" > 326 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L327" class = "LineNr" > 327 < / span > e8/call read/disp32
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< span id = "L328" class = "LineNr" > 328 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L329" class = "LineNr" > 329 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L330" class = "LineNr" > 330 < / span > < span class = "subxComment" > ## second read< / span >
< span id = "L331" class = "LineNr" > 331 < / span > < span class = "subxComment" > # read(_test-stream, _test-stream-buffer)< / span >
< span id = "L332" class = "LineNr" > 332 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L333" class = "LineNr" > 333 < / span > 68/push _test-stream-buffer/imm32
< span id = "L334" class = "LineNr" > 334 < / span > 68/push _test-stream/imm32
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< span id = "L335" class = "LineNr" > 335 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L336" class = "LineNr" > 336 < / span > e8/call read/disp32
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< span id = "L337" class = "LineNr" > 337 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L338" class = "LineNr" > 338 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 8/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L339" class = "LineNr" > 339 < / span > < span class = "subxComment" > # check-ints-equal(EAX, 0)< / span >
< span id = "L340" class = "LineNr" > 340 < / span > < span class = "subxComment" > # push args< / span >
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< span id = "L341" class = "LineNr" > 341 < / span > 68/push < span class = "Constant" > " F - test-read-returns-0-on-end-of-file" < / span > /imm32
< span id = "L342" class = "LineNr" > 342 < / span > 68/push 0/imm32
< span id = "L343" class = "LineNr" > 343 < / span > 50/push-EAX
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< span id = "L344" class = "LineNr" > 344 < / span > < span class = "subxComment" > # call< / span >
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< span id = "L345" class = "LineNr" > 345 < / span > e8/call check-ints-equal/disp32
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< span id = "L346" class = "LineNr" > 346 < / span > < span class = "subxComment" > # discard args< / span >
< span id = "L347" class = "LineNr" > 347 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > < span class = "CommentedCode" > . < / span > 0xc/imm32 < span class = "subxComment" > # add to ESP< / span >
< span id = "L348" class = "LineNr" > 348 < / span > < span class = "subxComment" > # end< / span >
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< span id = "L349" class = "LineNr" > 349 < / span > c3/return
< span id = "L350" class = "LineNr" > 350 < / span >
< span id = "L351" class = "LineNr" > 351 < / span > == data
< span id = "L352" class = "LineNr" > 352 < / span >
< span id = "L353" class = "LineNr" > 353 < / span > _test-stream-buffer:
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< span id = "L354" class = "LineNr" > 354 < / span > < span class = "subxComment" > # current write index< / span >
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< span id = "L355" class = "LineNr" > 355 < / span > 00 00 00 00
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< span id = "L356" class = "LineNr" > 356 < / span > < span class = "subxComment" > # current read index< / span >
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< span id = "L357" class = "LineNr" > 357 < / span > 00 00 00 00
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< span id = "L358" class = "LineNr" > 358 < / span > < span class = "subxComment" > # length (= 8)< / span >
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< span id = "L359" class = "LineNr" > 359 < / span > 08 00 00 00
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< span id = "L360" class = "LineNr" > 360 < / span > < span class = "subxComment" > # data< / span >
< span id = "L361" class = "LineNr" > 361 < / span > 00 00 00 00 00 00 00 00 < span class = "subxComment" > # 8 bytes< / span >
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< span id = "L362" class = "LineNr" > 362 < / span >
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< span id = "L363" class = "LineNr" > 363 < / span > < span class = "subxComment" > # vim: nowrap:textwidth=0< / span >
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< / pre >
< / body >
< / html >
<!-- vim: set foldmethod=manual : -->