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| author | Kartik Agaram <vc@akkartik.com> | 2018-08-03 23:23:39 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-08-03 23:23:39 -0700 |
| commit | 12adb3da8a8979c207b2e7fd17bdb05bacefeb44 (patch) | |
| tree | 12c1a96ffe7feb8b41613e0b2cead1c3919db8d9 /subx/ex3.subx | |
| parent | 85173b622021de062706df81947df7ae2300b654 (diff) | |
| download | mu-12adb3da8a8979c207b2e7fd17bdb05bacefeb44.tar.gz | |
4467
Diffstat (limited to 'subx/ex3.subx')
| -rw-r--r-- | subx/ex3.subx | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/subx/ex3.subx b/subx/ex3.subx index 2ad61edd..eb66f1bf 100644 --- a/subx/ex3.subx +++ b/subx/ex3.subx @@ -8,28 +8,28 @@ # 55 == 0x08048054 # code segment, after leaving room for ELF header -# 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 # result: EBX = 0 - bb/copy 0/imm32 # copy 0 to EBX + bb/copy 0/imm32 # copy 0 to EBX # counter: ECX = 1 - b9/copy 1/imm32 # copy 1 to ECX + b9/copy 1/imm32 # copy 1 to ECX loop: # while (counter <= 10) - 81 7/subop/compare 3/mod/direct 1/rm32/ecx 0xa/imm32 # compare ECX, 10/imm - 7f/jump-if exit/disp8 # jump-if-greater exit + 81 7/subop/compare 3/mod/direct 1/rm32/ecx 0xa/imm32 # compare ECX, 10/imm + 7f/jump-if exit/disp8 # jump-if-greater exit # result += counter - 01/add 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX + 01/add 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX # ++counter - 81 0/subop/add 3/mod/direct 1/rm32/ecx 1/imm32 # add 1 to ECX + 81 0/subop/add 3/mod/direct 1/rm32/ecx 1/imm32 # add 1 to ECX # loop - eb/jump loop/disp8 # jump loop + eb/jump loop/disp8 # jump loop exit: # exit(EBX) - b8/copy 1/imm32 # copy 1 to EAX - cd/syscall 0x80/imm8 # int 80h + b8/copy 1/imm32 # copy 1 to EAX + cd/syscall 0x80/imm8 # int 80h # vim:ft=subx:nowrap |