diff options
| author | Kartik Agaram <vc@akkartik.com> | 2019-07-21 22:23:20 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-07-21 22:23:20 -0700 |
| commit | ac8a9396b96259ed2d068abf30863540a21648f3 (patch) | |
| tree | b2fdf8988014b2ebc2fa2bd8fc733d03d3f1fa0f /subx/067parse-hex.subx | |
| parent | 8a1a3fb45f390d3142556802e0f0ea671a799da1 (diff) | |
| download | mu-ac8a9396b96259ed2d068abf30863540a21648f3.tar.gz | |
5437
Break a dependency from `print-int32` to `from-hex-char`.
Diffstat (limited to 'subx/067parse-hex.subx')
| -rw-r--r-- | subx/067parse-hex.subx | 809 |
1 files changed, 809 insertions, 0 deletions
diff --git a/subx/067parse-hex.subx b/subx/067parse-hex.subx new file mode 100644 index 00000000..bbfc4ec9 --- /dev/null +++ b/subx/067parse-hex.subx @@ -0,0 +1,809 @@ +# some utilities for converting numbers from hex +# lowercase letters only for now + +== 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 + +is-hex-int?: # in : (address slice) -> EAX : boolean + # . 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 + # ECX = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX + # EDX = s->end + 8b/copy 1/mod/*+disp8 1/rm32/ECX . . . 2/r32/EDX 4/disp8 . # copy *(ECX+4) to EDX + # curr/ECX = s->start + 8b/copy 0/mod/indirect 1/rm32/ECX . . . 1/r32/ECX . . # copy *ECX to ECX + # if s is empty return false + b8/copy-to-EAX 0/imm32/false + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 73/jump-if-greater-or-equal-unsigned $is-hex-int?:end/disp8 + # skip past leading '-' + # . if (*curr == '-') ++curr + 31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 3/r32/BL . . # copy byte at *ECX to BL + 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0x2d/imm32/- # compare EBX + 75/jump-if-not-equal $is-hex-int?:initial-0/disp8 + # . ++curr + 41/increment-ECX + # skip past leading '0x' +$is-hex-int?:initial-0: + # . if (*curr != '0') jump to loop + 31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 3/r32/BL . . # copy byte at *ECX to BL + 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0x30/imm32/0 # compare EBX + 75/jump-if-not-equal $is-hex-int?:loop/disp8 + # . ++curr + 41/increment-ECX +$is-hex-int?:initial-0x: + # . if (curr >= in->end) return true + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 73/jump-if-greater-or-equal-unsigned $is-hex-int?:true/disp8 + # . if (*curr != 'x') jump to loop # the previous '0' is still valid so doesn't need to be checked again + 31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 3/r32/BL . . # copy byte at *ECX to BL + 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0x78/imm32/x # compare EBX + 75/jump-if-not-equal $is-hex-int?:loop/disp8 + # . ++curr + 41/increment-ECX +$is-hex-int?:loop: + # if (curr >= in->end) return true + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 73/jump-if-greater-or-equal-unsigned $is-hex-int?:true/disp8 + # EAX = is-hex-digit?(*curr) + # . . push args + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + 50/push-EAX + # . . call + e8/call is-hex-digit?/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # if (EAX == false) return false + 3d/compare-EAX-and 0/imm32 + 74/jump-if-equal $is-hex-int?:end/disp8 + # ++curr + 41/increment-ECX + # loop + eb/jump $is-hex-int?:loop/disp8 +$is-hex-int?:true: + # return true + b8/copy-to-EAX 1/imm32/true +$is-hex-int?:end: + # . restore registers + 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-is-hex-int: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "34" + b8/copy-to-EAX "34"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int"/imm32 + 68/push 1/imm32/true + 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-is-hex-int-handles-letters: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "34a" + b8/copy-to-EAX "34a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-handles-letters"/imm32 + 68/push 1/imm32/true + 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-is-hex-int-with-trailing-char: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "34q" + b8/copy-to-EAX "34q"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-with-trailing-char"/imm32 + 68/push 0/imm32/false + 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-is-hex-int-with-leading-char: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "q34" + b8/copy-to-EAX "q34"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-with-leading-char"/imm32 + 68/push 0/imm32/false + 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-is-hex-int-empty: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # var slice/ECX = "" + 68/push 0/imm32 + 68/push 0/imm32 + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-empty"/imm32 + 68/push 0/imm32/false + 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-is-hex-int-handles-0x-prefix: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "0x3a" + b8/copy-to-EAX "0x3a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-handles-0x-prefix"/imm32 + 68/push 1/imm32/true + 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-is-hex-int-handles-negative: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "-34a" + b8/copy-to-EAX "-34a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-handles-negative"/imm32 + 68/push 1/imm32/true + 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-is-hex-int-handles-negative-0x-prefix: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "-0x3a" + b8/copy-to-EAX "-0x3a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = is-hex-int?(slice) + # . . push args + 51/push-ECX + # . . call + e8/call is-hex-int?/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-is-hex-int-handles-negative-0x-prefix"/imm32 + 68/push 1/imm32/true + 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 + +parse-hex-int: # in : (address slice) -> result/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 + # result/EBX = 0 + 31/xor 3/mod/direct 3/rm32/EBX . . . 3/r32/EBX . . # clear EBX + # ECX = s + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX + # EDX = s->end + 8b/copy 1/mod/*+disp8 1/rm32/ECX . . . 2/r32/EDX 4/disp8 . # copy *(ECX+4) to EDX + # curr/ECX = s->start + 8b/copy 0/mod/indirect 1/rm32/ECX . . . 1/r32/ECX . . # copy *ECX to ECX + # negate?/ESI = false + 31/xor 3/mod/direct 6/rm32/ESI . . . 6/r32/ESI . . # clear ESI +$parse-hex-int:negative: + # . if (*curr == '-') negate = true + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + 3d/compare-EAX-and 0x2d/imm32/- + 75/jump-if-not-equal $parse-hex-int:initial-0/disp8 + # . ++curr + 41/increment-ECX + # . negate = true + be/copy-to-ESI 1/imm32/true +$parse-hex-int:initial-0: + # skip past leading '0x' + # . if (*curr != '0') jump to loop + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + 3d/compare-EAX-and 0x30/imm32/0 + 75/jump-if-not-equal $parse-hex-int:loop/disp8 + # . ++curr + 41/increment-ECX +$parse-hex-int:initial-0x: + # . if (curr >= in->end) return result + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 73/jump-if-greater-or-equal-unsigned $parse-hex-int:end/disp8 + # . if (*curr != 'x') jump to loop # the previous '0' is still valid so doesn't need to be checked again + 31/xor 3/mod/direct 0/rm32/EAX . . . 0/r32/EAX . . # clear EAX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + 3d/compare-EAX-and 0x78/imm32/x + 75/jump-if-not-equal $parse-hex-int:loop/disp8 + # . ++curr + 41/increment-ECX +$parse-hex-int:loop: + # if (curr >= in->end) break + 39/compare 3/mod/direct 1/rm32/ECX . . . 2/r32/EDX . . # compare ECX with EDX + 73/jump-if-greater-or-equal-unsigned $parse-hex-int:negate/disp8 + # EAX = from-hex-char(*curr) + # . . copy arg to EAX + 8a/copy-byte 0/mod/indirect 1/rm32/ECX . . . 0/r32/AL . . # copy byte at *ECX to AL + # . . call + e8/call from-hex-char/disp32 + # result = result * 16 + EAX + c1/shift 4/subop/left 3/mod/direct 3/rm32/EBX . . . . . 4/imm8 # shift EBX left by 4 bits + 01/add 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # add EAX to EBX + # ++curr + 41/increment-ECX + # loop + eb/jump $parse-hex-int:loop/disp8 +$parse-hex-int:negate: + 81 7/subop/compare 3/mod/direct 6/rm32/ESI . . . . . 0/imm32 # compare ESI + 74/jump-if-equal $parse-hex-int:end/disp8 + f7 3/subop/negate 3/mod/direct 3/rm32/EBX . . . . . . # negate EBX +$parse-hex-int:end: + 89/copy 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # copy EBX to EAX + # . 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-parse-hex-int-single-digit: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "a" + b8/copy-to-EAX "a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0xa, msg) + # . . push args + 68/push "F - test-parse-hex-int-single-digit"/imm32 + 68/push 0xa/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-parse-hex-int-multi-digit: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "34a" + b8/copy-to-EAX "34a"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0x34a, msg) + # . . push args + 68/push "F - test-parse-hex-int-multi-digit"/imm32 + 68/push 0x34a/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-parse-hex-int-0x-prefix: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "0x34" + b8/copy-to-EAX "0x34"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0x34a, msg) + # . . push args + 68/push "F - test-parse-hex-int-0x-prefix"/imm32 + 68/push 0x34/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-parse-hex-int-zero: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "0" + b8/copy-to-EAX "0"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0x34a, msg) + # . . push args + 68/push "F - test-parse-hex-int-zero"/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-parse-hex-int-0-prefix: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "03" + b8/copy-to-EAX "03"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0x3, msg) + # . . push args + 68/push "F - test-parse-hex-int-0-prefix"/imm32 + 68/push 0x3/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-parse-hex-int-negative: + # . prolog + 55/push-EBP + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # (EAX..ECX) = "-03" + b8/copy-to-EAX "-03"/imm32 + 8b/copy 0/mod/indirect 0/rm32/EAX . . . 1/r32/ECX . . # copy *EAX to ECX + 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/EAX 1/index/ECX . 1/r32/ECX 4/disp8 . # copy EAX+ECX+4 to ECX + 05/add-to-EAX 4/imm32 + # var slice/ECX = {EAX, ECX} + 51/push-ECX + 50/push-EAX + 89/copy 3/mod/direct 1/rm32/ECX . . . 4/r32/ESP . . # copy ESP to ECX + # EAX = parse-hex-int(slice) + # . . push args + 51/push-ECX + # . . call + e8/call parse-hex-int/disp32 + # . . discard args + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + # check-ints-equal(EAX, 0xfffffffd, msg) + # . . push args + 68/push "F - test-parse-hex-int-negative"/imm32 + 68/push 0xfffffffd/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 + +is-hex-digit?: # c : byte -> EAX : boolean + # . 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 = c + 8b/copy 1/mod/*+disp8 5/rm32/EBP . . . 1/r32/ECX 8/disp8 . # copy *(EBP+8) to ECX + # return false if c < '0' + b8/copy-to-EAX 0/imm32/false + 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0x30/imm32 # compare ECX + 7c/jump-if-lesser $is-hex-digit?:end/disp8 + # return false if c > 'f' + 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0x66/imm32 # compare ECX + 7f/jump-if-greater $is-hex-digit?:end/disp8 + # return true if c <= '9' + b8/copy-to-EAX 1/imm32/true + 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0x39/imm32 # compare ECX + 7e/jump-if-lesser-or-equal $is-hex-digit?:end/disp8 + # return true if c >= 'a' + 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0x61/imm32 # compare ECX + 7d/jump-if-greater-or-equal $is-hex-digit?:end/disp8 + # otherwise return false + b8/copy-to-EAX 0/imm32/false +$is-hex-digit?: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-hex-below-0: + # EAX = is-hex-digit?(0x2f) + # . . push args + 68/push 0x2f/imm32 + # . . call + e8/call is-hex-digit?/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-hex-below-0"/imm32 + 68/push 0/imm32/false + 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 + c3/return + +test-hex-0-to-9: + # EAX = is-hex-digit?(0x30) + # . . push args + 68/push 0x30/imm32 + # . . call + e8/call is-hex-digit?/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-hex-at-0"/imm32 + 68/push 1/imm32/true + 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 + # EAX = is-hex-digit?(0x39) + # . . push args + 68/push 0x39/imm32 + # . . call + e8/call is-hex-digit?/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-hex-at-9"/imm32 + 68/push 1/imm32/true + 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 + c3/return + +test-hex-above-9-to-a: + # EAX = is-hex-digit?(0x3a) + # . . push args + 68/push 0x3a/imm32 + # . . call + e8/call is-hex-digit?/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-hex-above-9-to-a"/imm32 + 68/push 0/imm32/false + 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 + c3/return + +test-hex-a-to-f: + # EAX = is-hex-digit?(0x61) + # . . push args + 68/push 0x61/imm32 + # . . call + e8/call is-hex-digit?/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-hex-at-a"/imm32 + 68/push 1/imm32/true + 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 + # EAX = is-hex-digit?(0x66) + # . . push args + 68/push 0x66/imm32 + # . . call + e8/call is-hex-digit?/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-hex-at-f"/imm32 + 68/push 1/imm32/true + 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 + c3/return + +test-hex-above-f: + # EAX = is-hex-digit?(0x67) + # . . push args + 68/push 0x67/imm32 + # . . call + e8/call is-hex-digit?/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-hex-above-f"/imm32 + 68/push 0/imm32/false + 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 + c3/return + +from-hex-char: # in/EAX : byte -> out/EAX : nibble + # no error checking; accepts argument in EAX + # if (EAX <= '9') return EAX - '0' + 3d/compare-EAX-with 0x39/imm32/9 + 7f/jump-if-greater $from-hex-char:else/disp8 + 2d/subtract-from-EAX 0x30/imm32/0 + c3/return +$from-hex-char:else: + # otherwise return EAX - 'a' + 10 + 2d/subtract-from-EAX 0x57/imm32/a-10 + c3/return + +# . . vim:nowrap:textwidth=0 |