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< a href = 'https://github.com/akkartik/mu/blob/master/mu-init.subx' > https://github.com/akkartik/mu/blob/master/mu-init.subx< / a >
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< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > # Initialize the minimal runtime for Mu programs.< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "subxComment" > #< / span >
< span id = "L3" class = "LineNr" > 3 < / span > < span class = "subxComment" > # See translate_mu for how this file is used.< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "subxComment" > #< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "subxComment" > # Mu programs start at a function called 'main' with this signature:< / span >
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< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxComment" > # fn main args: (addr array addr array byte) -> _/ebx: int< / span >
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< span id = "L7" class = "LineNr" > 7 < / span > < span class = "subxComment" > # If your program doesn't need commandline arguments you can drop it:< / span >
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< span id = "L8" class = "LineNr" > 8 < / span > < span class = "subxComment" > # fn main -> _/ebx: int< / span >
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< span id = "L9" class = "LineNr" > 9 < / span > < span class = "subxComment" > #< / span >
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "subxComment" > # Notice that the output must be in ebx, so that the exit() syscall can pick< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "subxComment" > # it up.< / span >
< span id = "L12" class = "LineNr" > 12 < / span >
< span id = "L13" class = "LineNr" > 13 < / span > == code
< span id = "L14" class = "LineNr" > 14 < / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "SpecialChar" > Entry< / span > :
< span id = "L16" class = "LineNr" > 16 < / span > < span class = "subxComment" > # we don't use ebp in Entry; just initialize it< / span >
< span id = "L17" class = "LineNr" > 17 < / span > bd/copy-to-ebp 0/imm32
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< span id = "L18" class = "LineNr" > 18 < / span > < span class = "subxH1Comment" > # - save argc and argv< / span >
< span id = "L19" class = "LineNr" > 19 < / span > < span class = "subxComment" > # var argc-and-argv/esi< / span >
< span id = "L20" class = "LineNr" > 20 < / span > 89/< - %esi 4/r32/esp
< span id = "L21" class = "LineNr" > 21 < / span > < span class = "Constant" > $Entry:initialize-heap< / span > :
< span id = "L22" class = "LineNr" > 22 < / span > < span class = "subxH1Comment" > # - initialize the heap< / span >
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< span id = "L23" class = "LineNr" > 23 < / span > (< a href = '104new-segment.subx.html#L40' > new-segment< / a > *< span class = "SpecialChar" > < a href = '120allocate.subx.html#L34' > Heap-size< / a > < / span > < span class = "SpecialChar" > < a href = '120allocate.subx.html#L27' > Heap< / a > < / span > )
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< span id = "L24" class = "LineNr" > 24 < / span > < span class = "Constant" > $Entry:initialize-args< / span > :
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "subxH1Comment" > # - convert argv from null-terminated 'kernel' strings to length-prefixed Mu strings< / span >
< span id = "L26" class = "LineNr" > 26 < / span > < span class = "subxComment" > # var argc/edx: int< / span >
< span id = "L27" class = "LineNr" > 27 < / span > 8b/-> *esi 2/r32/edx
< span id = "L28" class = "LineNr" > 28 < / span > < span class = "subxComment" > # argc is in words; convert it to bytes< / span >
< span id = "L29" class = "LineNr" > 29 < / span > c1/shift 4/subop/left %edx 2/imm8
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< span id = "L30" class = "LineNr" > 30 < / span > < span class = "subxComment" > # var tmp/ebx: handle< / span >
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< span id = "L31" class = "LineNr" > 31 < / span > 68/push 0/imm32
< span id = "L32" class = "LineNr" > 32 < / span > 68/push 0/imm32
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< span id = "L33" class = "LineNr" > 33 < / span > 89/< - %ebx 4/r32/esp
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< span id = "L34" class = "LineNr" > 34 < / span > < span class = "subxComment" > # var args/edi: (addr array (addr array byte))< / span >
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< span id = "L35" class = "LineNr" > 35 < / span > (< a href = '120allocate.subx.html#L576' > allocate-array< / a > < span class = "SpecialChar" > < a href = '120allocate.subx.html#L27' > Heap< / a > < / span > %edx %ebx)
< span id = "L36" class = "LineNr" > 36 < / span > (< a href = '120allocate.subx.html#L256' > lookup< / a > *ebx *(ebx+4)) < span class = "subxComment" > # => eax< / span >
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< span id = "L37" class = "LineNr" > 37 < / span > 89/< - %edi 0/r32/eax
< span id = "L38" class = "LineNr" > 38 < / span > < span class = "subxComment" > # var curr/ecx: (addr kernel-string) = argv< / span >
< span id = "L39" class = "LineNr" > 39 < / span > 8d/copy-address *(esi+4) 1/r32/ecx
< span id = "L40" class = "LineNr" > 40 < / span > < span class = "subxComment" > # var max/edx: (addr kernel-string) = argv+4+argc< / span >
< span id = "L41" class = "LineNr" > 41 < / span > 8d/copy-address *(ecx+edx) 2/r32/edx
< span id = "L42" class = "LineNr" > 42 < / span > < span class = "subxComment" > # var dest/esi: (addr (addr array byte)) = args+4< / span >
< span id = "L43" class = "LineNr" > 43 < / span > 8d/copy-address *(edi+4) 6/r32/esi
< span id = "L44" class = "LineNr" > 44 < / span > {
< span id = "L45" class = "LineNr" > 45 < / span > < span class = "subxComment" > # if (curr > = max) break< / span >
< span id = "L46" class = "LineNr" > 46 < / span > 39/compare %ecx 2/r32/edx
< span id = "L47" class = "LineNr" > 47 < / span > 73/jump-if-addr> = < span class = "Constant" > break< / span > /disp8
< span id = "L48" class = "LineNr" > 48 < / span > < span class = "subxComment" > # *dest = kernel-string-to-string(*curr)< / span >
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< span id = "L49" class = "LineNr" > 49 < / span > (< a href = '303kernel-string.subx.html#L7' > kernel-string-to-string< / a > < span class = "SpecialChar" > < a href = '120allocate.subx.html#L27' > Heap< / a > < / span > *ecx %ebx)
< span id = "L50" class = "LineNr" > 50 < / span > (< a href = '120allocate.subx.html#L256' > lookup< / a > *ebx *(ebx+4)) < span class = "subxComment" > # => eax< / span >
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< span id = "L51" class = "LineNr" > 51 < / span > 89/< - *esi 0/r32/eax
< span id = "L52" class = "LineNr" > 52 < / span > < span class = "subxComment" > # curr += 4< / span >
< span id = "L53" class = "LineNr" > 53 < / span > 81 0/subop/add %ecx 4/imm32
< span id = "L54" class = "LineNr" > 54 < / span > < span class = "subxComment" > # dest += 4< / span >
< span id = "L55" class = "LineNr" > 55 < / span > 81 0/subop/add %esi 4/imm32
< span id = "L56" class = "LineNr" > 56 < / span > < span class = "subxComment" > #< / span >
< span id = "L57" class = "LineNr" > 57 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L58" class = "LineNr" > 58 < / span > }
< span id = "L59" class = "LineNr" > 59 < / span > < span class = "subxH1Comment" > # - run Mu program< / span >
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< span id = "L60" class = "LineNr" > 60 < / span > (main %edi) < span class = "subxComment" > # => ebx< / span >
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< span id = "L61" class = "LineNr" > 61 < / span > < span class = "subxH1Comment" > # - exit< / span >
< span id = "L62" class = "LineNr" > 62 < / span > (syscall_exit)
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