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2018-09-24 05:38:16 +00:00
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2018-09-22 07:32:03 +00:00
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2018-10-28 20:41:53 +00:00
< span id = "L1" class = "LineNr" > 1 < / span > < span class = "SalientComment" > ## port of < a href = "https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas" > https://github.com/akkartik/crenshaw/blob/master/tutor2.1.pas< / a > < / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "Comment" > # corresponds to the section " single digits" in < a href = "https://compilers.iecc.com/crenshaw/tutor2.txt" > https://compilers.iecc.com/crenshaw/tutor2.txt< / a > < / span >
< span id = "L3" class = "LineNr" > 3 < / span > < span class = "Comment" > #< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "Comment" > # To run (from the subx directory):< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "Comment" > # $ ./subx translate *.subx apps/crenshaw2-1.subx -o crenshaw2-1< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "Comment" > # $ echo '3' |./subx run apps/crenshaw2-1< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "Comment" > # Expected output (not working yet):< / span >
< span id = "L8" class = "LineNr" > 8 < / span > < span class = "Comment" > # # syscall(exit, 3)< / span >
< span id = "L9" class = "LineNr" > 9 < / span > < span class = "Comment" > # bb/copy-to-EBX 3/imm32< / span >
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "Comment" > # b8/copy-to-EAX 1/imm32/exit< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "Comment" > # cd/syscall 0x80/imm8< / span >
< span id = "L12" class = "LineNr" > 12 < / span > < span class = "Comment" > #< / span >
< span id = "L13" class = "LineNr" > 13 < / span > < span class = "Comment" > # To run the generated output:< / span >
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "Comment" > # $ echo '3' |./subx run apps/crenshaw2-1 > z1.subx< / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "Comment" > # $ ./subx translate z1.subx -o z1< / span >
< span id = "L16" class = "LineNr" > 16 < / span > < span class = "Comment" > # $ ./subx run z1< / span >
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "Comment" > # $ echo $?< / span >
< span id = "L18" class = "LineNr" > 18 < / span > < span class = "Comment" > # 3< / span >
< span id = "L19" class = "LineNr" > 19 < / span > < span class = "Comment" > #< / span >
< span id = "L20" class = "LineNr" > 20 < / span > < span class = "Comment" > # Stdin must contain just a single hex number. Other input will print an error:< / span >
< span id = "L21" class = "LineNr" > 21 < / span > < span class = "Comment" > # $ echo 'xyz' |./subx run apps/crenshaw2-1< / span >
< span id = "L22" class = "LineNr" > 22 < / span > < span class = "Comment" > # Error: integer expected< / span >
< span id = "L23" class = "LineNr" > 23 < / span >
< span id = "L24" class = "LineNr" > 24 < / span > == code
< span id = "L25" class = "LineNr" > 25 < / span > < span class = "Comment" > # instruction effective address operand displacement immediate< / span >
< span id = "L26" class = "LineNr" > 26 < / span > < span class = "Comment" > # op subop mod rm32 base index scale r32< / span >
< span id = "L27" class = "LineNr" > 27 < / span > < span class = "Comment" > # 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 >
< span id = "L28" class = "LineNr" > 28 < / span >
< span id = "L29" class = "LineNr" > 29 < / span > < span class = "Comment" > # main:< / span >
< span id = "L30" class = "LineNr" > 30 < / span > < span class = "Comment" > # allocate space for an exit-descriptor< / span >
< span id = "L31" class = "LineNr" > 31 < / span > < span class = "Comment" > # var ed/EAX : (address exit-descriptor)< / span >
< span id = "L32" class = "LineNr" > 32 < / span > 81 5/subop/subtract 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/imm32 < span class = "Comment" > # subtract from ESP< / span >
< span id = "L33" class = "LineNr" > 33 < / span > 8d/copy-address 0/mod/indirect 4/rm32/sib 4/base/ESP 4/index/none < span class = "Delimiter" > . < / span > 0/r32/EAX < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Comment" > # copy ESP to EAX< / span >
< span id = "L34" class = "LineNr" > 34 < / span > < span class = "Comment" > # clear ed-> target (so we really exit)< / span >
< span id = "L35" class = "LineNr" > 35 < / span > c7/copy 0/mod/direct 0/rm32/EAX < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0/imm32 < span class = "Comment" > # copy to *EAX< / span >
< span id = "L36" class = "LineNr" > 36 < / span > < span class = "Comment" > # expected(ed, 2/stderr, " integer" )< / span >
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "Comment" > # push args< / span >
< span id = "L38" class = "LineNr" > 38 < / span > 68/push " integer" /imm32
< span id = "L39" class = "LineNr" > 39 < / span > 68/push 2/imm32/stderr
< span id = "L40" class = "LineNr" > 40 < / span > 50/push-EAX
< span id = "L41" class = "LineNr" > 41 < / span > < span class = "Comment" > # call< / span >
< span id = "L42" class = "LineNr" > 42 < / span > e8/call expected/disp32
< span id = "L43" class = "LineNr" > 43 < / span > < span class = "Comment" > # discard args< / span >
< span id = "L44" class = "LineNr" > 44 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0xc/imm32 < span class = "Comment" > # add to ESP< / span >
< span id = "L45" class = "LineNr" > 45 < / span > < span class = "Comment" > # syscall(exit, 0)< / span >
< span id = "L46" class = "LineNr" > 46 < / span > bb/copy-to-EBX 0/imm32
< span id = "L47" class = "LineNr" > 47 < / span > b8/copy-to-EAX 1/imm32/exit
< span id = "L48" class = "LineNr" > 48 < / span > cd/syscall 0x80/imm8
< span id = "L49" class = "LineNr" > 49 < / span >
< span id = "L50" class = "LineNr" > 50 < / span > < span class = "SalientComment" > ## helpers< / span >
< span id = "L51" class = "LineNr" > 51 < / span >
< span id = "L52" class = "LineNr" > 52 < / span > expected: < span class = "Comment" > # ed : (address exit-descriptor), f : fd or (address stream), s : (address array byte)< / span >
< span id = "L53" class = "LineNr" > 53 < / span > < span class = "Comment" > # prolog< / span >
< span id = "L54" class = "LineNr" > 54 < / span > 55/push-EBP
< span id = "L55" class = "LineNr" > 55 < / span > 89/copy 3/mod/direct 5/rm32/EBP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 4/r32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Comment" > # copy ESP to EBP< / span >
< span id = "L56" class = "LineNr" > 56 < / span > < span class = "Comment" > # write(f, " Error: " )< / span >
< span id = "L57" class = "LineNr" > 57 < / span > < span class = "Comment" > # push args< / span >
< span id = "L58" class = "LineNr" > 58 < / span > 68/push " Error: " /imm32
< span id = "L59" class = "LineNr" > 59 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0xc/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+12)< / span >
< span id = "L60" class = "LineNr" > 60 < / span > < span class = "Comment" > # call< / span >
< span id = "L61" class = "LineNr" > 61 < / span > e8/call write/disp32
< span id = "L62" class = "LineNr" > 62 < / span > < span class = "Comment" > # discard args< / span >
< span id = "L63" class = "LineNr" > 63 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/imm32 < span class = "Comment" > # add to ESP< / span >
< span id = "L64" class = "LineNr" > 64 < / span > < span class = "Comment" > # write(f, s)< / span >
< span id = "L65" class = "LineNr" > 65 < / span > < span class = "Comment" > # push args< / span >
< span id = "L66" class = "LineNr" > 66 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0x10/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+16)< / span >
< span id = "L67" class = "LineNr" > 67 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0xc/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+12)< / span >
< span id = "L68" class = "LineNr" > 68 < / span > < span class = "Comment" > # call< / span >
< span id = "L69" class = "LineNr" > 69 < / span > e8/call write/disp32
< span id = "L70" class = "LineNr" > 70 < / span > < span class = "Comment" > # discard args< / span >
< span id = "L71" class = "LineNr" > 71 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/imm32 < span class = "Comment" > # add to ESP< / span >
< span id = "L72" class = "LineNr" > 72 < / span > < span class = "Comment" > # write(f, " expected" )< / span >
< span id = "L73" class = "LineNr" > 73 < / span > < span class = "Comment" > # push args< / span >
< span id = "L74" class = "LineNr" > 74 < / span > 68/push " expected" /imm32
< span id = "L75" class = "LineNr" > 75 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0xc/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+12)< / span >
< span id = "L76" class = "LineNr" > 76 < / span > < span class = "Comment" > # call< / span >
< span id = "L77" class = "LineNr" > 77 < / span > e8/call write/disp32
< span id = "L78" class = "LineNr" > 78 < / span > < span class = "Comment" > # discard args< / span >
< span id = "L79" class = "LineNr" > 79 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/imm32 < span class = "Comment" > # add to ESP< / span >
< span id = "L80" class = "LineNr" > 80 < / span > < span class = "Comment" > # write(f, Newline)< / span >
< span id = "L81" class = "LineNr" > 81 < / span > < span class = "Comment" > # push args< / span >
< span id = "L82" class = "LineNr" > 82 < / span > 68/push Newline/imm32
< span id = "L83" class = "LineNr" > 83 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 0xc/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+12)< / span >
< span id = "L84" class = "LineNr" > 84 < / span > < span class = "Comment" > # call< / span >
< span id = "L85" class = "LineNr" > 85 < / span > e8/call write/disp32
< span id = "L86" class = "LineNr" > 86 < / span > < span class = "Comment" > # discard args< / span >
< span id = "L87" class = "LineNr" > 87 < / span > 81 0/subop/add 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/imm32 < span class = "Comment" > # add to ESP< / span >
< span id = "L88" class = "LineNr" > 88 < / span > < span class = "Comment" > # stop(ed, 1)< / span >
< span id = "L89" class = "LineNr" > 89 < / span > < span class = "Comment" > # push args< / span >
< span id = "L90" class = "LineNr" > 90 < / span > 68/push 1/imm32
< span id = "L91" class = "LineNr" > 91 < / span > ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 8/disp8 < span class = "Delimiter" > . < / span > < span class = "Comment" > # push *(EBP+8)< / span >
< span id = "L92" class = "LineNr" > 92 < / span > < span class = "Comment" > # call< / span >
< span id = "L93" class = "LineNr" > 93 < / span > e8/call stop/disp32
< span id = "L94" class = "LineNr" > 94 < / span > < span class = "SalientComment" > ## should never get past this point< / span >
< span id = "L95" class = "LineNr" > 95 < / span > < span class = "Comment" > # epilog< / span >
< span id = "L96" class = "LineNr" > 96 < / span > 89/copy 3/mod/direct 4/rm32/ESP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > 5/r32/EBP < span class = "Delimiter" > . < / span > < span class = "Delimiter" > . < / span > < span class = "Comment" > # copy EBP to ESP< / span >
< span id = "L97" class = "LineNr" > 97 < / span > 5d/pop-to-EBP
< span id = "L98" class = "LineNr" > 98 < / span > c3/return
< span id = "L99" class = "LineNr" > 99 < / span >
< span id = "L100" class = "LineNr" > 100 < / span > < span class = "Comment" > # vim: nowrap:textwidth=0< / span >
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