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| author | Kartik Agaram <vc@akkartik.com> | 2018-11-30 10:54:42 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-11-30 10:54:42 -0800 |
| commit | 6030d7e2e56d445ca67c6a0e8c9cf33e46bc673c (patch) | |
| tree | 83b6fc800dc5c90295b58e5b0494b083636efbaa /subx/examples/ex10.subx | |
| parent | e9661581f092f3e210b7bd900af058d8b8c4369e (diff) | |
| download | mu-6030d7e2e56d445ca67c6a0e8c9cf33e46bc673c.tar.gz | |
4801
Reindent all SubX code to make some room for the new comment style.
Diffstat (limited to 'subx/examples/ex10.subx')
| -rw-r--r-- | subx/examples/ex10.subx | 74 |
1 files changed, 37 insertions, 37 deletions
diff --git a/subx/examples/ex10.subx b/subx/examples/ex10.subx index b179369f..4da713ae 100644 --- a/subx/examples/ex10.subx +++ b/subx/examples/ex10.subx @@ -8,9 +8,9 @@ # 0 # false == code -# instruction effective address operand 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 +# instruction effective address operand 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 # main: return argv-equal(argv[1], argv[2]) # At the start of a SubX program: @@ -18,55 +18,55 @@ # argv[0]: *(ESP+4) # argv[1]: *(ESP+8) # ... - # prolog - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP - # call argv-equal(argv[1], argv[2]) + # prolog + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # call argv-equal(argv[1], argv[2]) # push argv[2] - ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . . 0xc/disp8 . # push *(EBP+12) + ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . . 0xc/disp8 . # push *(EBP+12) # push argv[1] - ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . . 0x8/disp8 . # push *(EBP+8) + ff 6/subop/push 1/mod/*+disp8 4/rm32/sib 5/base/EBP 4/index/none . . 0x8/disp8 . # push *(EBP+8) # call - e8/call argv-equal/disp32 - # exit(EAX) + e8/call argv-equal/disp32 + # exit(EAX) $exit: - 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX - b8/copy-to-EAX 1/imm32 - cd/syscall 0x80/imm8 + 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX + b8/copy-to-EAX 1/imm32 + cd/syscall 0x80/imm8 # compare two null-terminated ascii strings # reason for the name: the only place we should have null-terminated ascii strings is from commandline args argv-equal: # (s1, s2) : null-terminated ascii strings -> EAX : boolean - # initialize s1 (ECX) and s2 (EDX) - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 1/r32/ECX 4/disp8 . # copy *(ESP+4) to ECX - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 8/disp8 . # copy *(ESP+8) to EDX - # while (true) + # initialize s1 (ECX) and s2 (EDX) + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 1/r32/ECX 4/disp8 . # copy *(ESP+4) to ECX + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 8/disp8 . # copy *(ESP+8) to EDX + # while (true) $argv-equal:loop: # c1/EAX, c2/EBX = *s1, *s2 - b8/copy-to-EAX 0/imm32 - 8a/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy byte at *ECX to lower byte of EAX - bb/copy-to-EBX 0/imm32 - 8a/copy 0/mod/indirect 2/rm32/EDX . . . 3/r32/EBX . . # copy byte at *EDX to lower byte of EBX + b8/copy-to-EAX 0/imm32 + 8a/copy 0/mod/indirect 1/rm32/ECX . . . 0/r32/EAX . . # copy byte at *ECX to lower byte of EAX + bb/copy-to-EBX 0/imm32 + 8a/copy 0/mod/indirect 2/rm32/EDX . . . 3/r32/EBX . . # copy byte at *EDX to lower byte of EBX # if (c1 == 0) break - 3d/compare-EAX 0/imm32 - 74/jump-if-equal $argv-equal:break/disp8 + 3d/compare-EAX 0/imm32 + 74/jump-if-equal $argv-equal:break/disp8 # if (c1 != c2) return false - 39/compare 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # compare EAX with EBX - 75/jump-if-not-equal $argv-equal:false/disp8 + 39/compare 3/mod/direct 0/rm32/EAX . . . 3/r32/EBX . . # compare EAX with EBX + 75/jump-if-not-equal $argv-equal:false/disp8 # ++s1, ++s2 - 41/inc-ECX - 42/inc-EDX - # end while - eb/jump $argv-equal:loop/disp8 + 41/inc-ECX + 42/inc-EDX + # end while + eb/jump $argv-equal:loop/disp8 $argv-equal:break: - # if (c2 == 0) return true - 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0/imm32 # compare EBX - 75/jump-if-not-equal $argv-equal:false/disp8 + # if (c2 == 0) return true + 81 7/subop/compare 3/mod/direct 3/rm32/EBX . . . . . 0/imm32 # compare EBX + 75/jump-if-not-equal $argv-equal:false/disp8 $argv-equal:success: - b8/copy-to-EAX 1/imm32 - c3/return - # return false + b8/copy-to-EAX 1/imm32 + c3/return + # return false $argv-equal:false: - b8/copy-to-EAX 0/imm32 - c3/return + b8/copy-to-EAX 0/imm32 + c3/return # vim:nowrap:textwidth=0 |