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Diffstat (limited to 'subx/069slice.subx')
| -rw-r--r-- | subx/069slice.subx | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/subx/069slice.subx b/subx/069slice.subx new file mode 100644 index 00000000..dda19ad8 --- /dev/null +++ b/subx/069slice.subx @@ -0,0 +1,526 @@ +# new data structure: a slice is an open interval of addresses [start, end) +# that includes 'start' but not 'end' + +== code +# instruction effective address register displacement immediate +# . op subop mod rm32 base index scale r32 +# . 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 + +#? e8/call test-write-byte-multiple-flushes/disp32 +#? #? e8/call test-foo/disp32 +#? #? e8/call test-slice-equal/disp32 +#? bb/copy-to-EBX 0/imm32 +#? b8/copy-to-EAX 1/imm32/exit +#? cd/syscall 0x80/imm8 + +#? # stop directly - seems fine +#? # error-byte - writing out of bounds +#? # drop stop - writing out of bounds +#? +#? test-foo: +#? # This test uses exit-descriptors. Use EBP for setting up local variables. +#? 55/push-EBP +#? 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP +#? # initialize '_test-stream' to "a" +#? # . write(_test-stream, "a") +#? # . . push args +#? 68/push "a"/imm32 +#? 68/push _test-stream/imm32 +#? # . . call +#? e8/call write/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # initialize exit-descriptor 'ed' for the call to 'convert-next-octet' below +#? # . var ed/ECX : exit-descriptor +#? 81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # subtract from ESP +#? 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX +#? # . tailor-exit-descriptor(ed, 12) +#? # . . push args +#? 68/push 0xc/imm32/nbytes-of-args-for-convert-next-octet +#? 51/push-ECX/ed +#? # . . call +#? e8/call tailor-exit-descriptor/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # EAX = foo(_test-buffered-file, _test-error-buffered-file, ed) +#? # . . push args +#? 51/push-ECX/ed +#? 68/push _test-foo-error-buffered-file/imm32 +#? 68/push _test-buffered-file/imm32 +#? # . . call +#? e8/call foo/disp32 +#? # registers except ESP may be clobbered at this point +#? # pop args to convert-next-octet +#? # . . discard first 2 args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # . . restore ed +#? 59/pop-to-ECX +#? # . epilog +#? # don't restore ESP from EBP; manually reclaim locals +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? 5d/pop-to-EBP +#? c3/return +#? +#? foo: # in : (address buffered-file), err : (address buffered-file), ed : (address exit-descriptor) -> byte-or-eof/EAX +#? # . prolog +#? 55/push-EBP +#? 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP +#? # . foo-error-byte(ed, err, msg, '.') +#? # . . push args +#? 68/push 0x2e/imm32/period/dummy +#? 68/push "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"/imm32 +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) +#? # . . call +#? e8/call foo-error-byte/disp32 # never returns +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0x10/imm32 # add to ESP +#? # . epilog +#? 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP +#? 5d/pop-to-EBP +#? c3/return +#? +#? # write(out, "Error: "+msg+": "+byte) then stop(ed, 1) +#? foo-error-byte: # ed : (address exit-descriptor), out : (address buffered-file), msg : (address array byte), n : byte -> <void> +#? # . prolog +#? 55/push-EBP +#? 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP +#? # write-buffered(out, "Error: ") +#? # . . push args +#? 68/push "Error: "/imm32 +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) +#? # . . call +#? e8/call write-buffered/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # write-buffered(out, msg) +#? # . . push args +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x10/disp8 . # push *(EBP+16) +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) +#? # . . call +#? e8/call write-buffered/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # write-buffered(out, ": ") +#? # . . push args +#? 68/push ": "/imm32 +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) +#? # . . call +#? e8/call write-buffered/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? # print-byte(out, byte) +#? # . . push args +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0x14/disp8 . # push *(EBP+20) +#? ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) +#? # . . call +#? e8/call print-byte/disp32 +#? # . . discard args +#? 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP +#? $foo-error-byte:dead-end: +#? # . epilog +#? 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP +#? 5d/pop-to-EBP +#? c3/return + +# main: + e8/call run-tests/disp32 # 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'. + # syscall(exit, Num-test-failures) + 8b/copy 0/mod/indirect 5/rm32/.disp32 . . 3/r32/EBX Num-test-failures/disp32 # copy *Num-test-failures to EBX + b8/copy-to-EAX 1/imm32/exit + cd/syscall 0x80/imm8 + +slice-empty?: # s : (address slice) -> bool/EAX + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 51/push-ECX + # ECX = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX + # if s->start == s->end return true + # . EAX = s->start + 8b/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy *ECX to EAX + # . compare EAX with s->end + 39/compare 1/mod/*+disp8 1/rm32/ECX . . . 0/r32/EAX 4/disp8 . # compare EAX and *(ECX+4) + b8/copy-to-EAX 1/imm32/false + 74/jump-if-equal $slice-empty?:end/disp8 + b8/copy-to-EAX 0/imm32/false +$slice-empty?:end: + # . restore registers + 59/pop-to-ECX + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-empty-true: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX = {34, 34} + 68/push 34/imm32/end + 68/push 34/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # slice-empty?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call slice-empty?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-slice-empty-true"/imm32 + 68/push 1/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-empty-false: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX = {34, 23} + 68/push 23/imm32/end + 68/push 34/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # slice-empty?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call slice-empty?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-empty-false"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +slice-equal?: # s : (address slice), k : (address kernel-string) -> bool/EAX + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # . save registers + 51/push-ECX + 52/push-EDX + 53/push-EBX + 56/push-ESI + # EAX = ECX = false + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 31/xor 3/mod/direct 1/rm32/ECX . . . 1/r32/ECX . . # clear ECX + # ESI = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 6/r32/ESI 8/disp8 . # copy *(EBP+8) to ESI + # curr/EDX = s->start + 8b/copy 0/mod/indirect 6/rm32/ESI . . . 2/r32/EDX . . # copy *ESI to EDX + # max/ESI = s->end + 8b/copy 1/mod/*+disp8 6/rm32/ESI . . . 6/r32/ESI 4/disp8 . # copy *(ESI+4) to ESI + # EBX = k + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 3/r32/EBX 0xc/disp8 . # copy *(EBP+12) to EBX +$slice-equal?:loop: + # AL = *k + 8a/copy-byte 0/mod/indirect 3/rm32/EBX . . . 0/r32/AL . . # copy byte at *EBX to AL + # if (curr >= max) return *k == 0 + 39/compare 3/mod/direct 2/rm32/EDX . . . 6/r32/ESI . . # compare EDX and ESI + 7c/jump-if-lesser $slice-equal?:check2/disp8 + 3d/compare-with-EAX 0/imm32 + 74/jump-if-equal $slice-equal?:true/disp8 + eb/jump $slice-equal?:false/disp8 +$slice-equal?:check2: + # if (EAX == 0) return false + 3d/compare-with-EAX 0/imm32 + 74/jump-if-equal $slice-equal?:false/disp8 + # CL = *curr + 8a/copy-byte 0/mod/indirect 2/rm32/EDX . . . 1/r32/CL . . # copy byte at *EDX to CL + # if (EAX != ECX) return false + 39/compare 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # compare EAX and ECX + 75/jump-if-not-equal $slice-equal?:false/disp8 + # ++k + 43/increment-EBX + # ++curr + 42/increment-EDX + eb/jump $slice-equal?:loop/disp8 +$slice-equal?:false: + b8/copy-to-EAX 0/imm32 + eb/jump $slice-equal?:end/disp8 +$slice-equal?:true: + b8/copy-to-EAX 1/imm32 +$slice-equal?:end: + # . restore registers + 5e/pop-to-ESI + 5b/pop-to-EBX + 5a/pop-to-EDX + 59/pop-to-ECX + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal: + # - slice-equal?(slice("Abc"), "Abc") == 1 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-3/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "Abc") + # . . push args + 68/push _test-Abc-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-slice-equal"/imm32 + 68/push 1/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-false: + # - slice-equal?(slice("bcd"), "Abc") == 0 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-4/imm32/end + 68/push _test-slice-data-1/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "Abc") + # . . push args + 68/push _test-Abc-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-equal-false"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-too-long: + # - slice-equal?(slice("Abcd"), "Abc") == 0 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-4/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "Abc") + # . . push args + 68/push _test-Abc-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-equal-too-long"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-too-short: + # - slice-equal?(slice("A"), "Abc") == 0 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-1/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "Abc") + # . . push args + 68/push _test-Abc-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-equal-too-short"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-empty: + # - slice-equal?(slice(""), "Abc") == 0 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-0/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "Abc") + # . . push args + 68/push _test-Abc-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-equal-empty"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-with-empty: + # - slice-equal?(slice("Ab"), "") == 0 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-2/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "") + # . . push args + 68/push Null-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 0, msg) + # . . push args + 68/push "F - test-slice-equal-with-empty"/imm32 + 68/push 0/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +test-slice-equal-empty-with-empty: + # - slice-equal?(slice(""), "") == 1 + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX + 68/push _test-slice-data-0/imm32/end + 68/push _test-slice-data-0/imm32/start + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = slice-equal?(ECX, "") + # . . push args + 68/push Null-kernel-string/imm32 + 51/push-ECX + # . . call + e8/call slice-equal?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP + # check-ints-equal(EAX, 1, msg) + # . . push args + 68/push "F - test-slice-equal-empty-with-empty"/imm32 + 68/push 1/imm32 + 50/push-EAX + # . . call + e8/call check-ints-equal/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 0xc/imm32 # add to ESP + # . epilog + 89/copy 3/mod/direct 4/rm32/ESP . . . 5/r32/EBP . . # copy EBP to ESP + 5d/pop-to-EBP + c3/return + +== data + +#? _test-foo-error-stream: +#? # current write index +#? 00 00 00 00 +#? # current read index +#? 00 00 00 00 +#? # length (= 8) +#? 08 00 00 00 +#? # data +#? 00 00 00 00 00 00 00 00 # 8 bytes +#? +#? # a test buffered file for _test-stream +#? _test-foo-error-buffered-file: +#? # file descriptor or (address stream) +#? _test-foo-error-stream/imm32 +#? # current write index +#? 00 00 00 00 +#? # current read index +#? 00 00 00 00 +#? # length (6) +#? 06 00 00 00 +#? # data +#? 00 00 00 00 00 00 # 6 bytes + +_test-slice-data-0: + 41/A +_test-slice-data-1: + 62/b +_test-slice-data-2: + 63/c +_test-slice-data-3: + 64/d +_test-slice-data-4: + +# . . vim:nowrap:textwidth=0 |