diff options
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 8560167d..9b5391a8 100644 --- a/subx/ex3.subx +++ b/subx/ex3.subx @@ -8,29 +8,29 @@ # 55 == 0x08048054 # code segment, after leaving room for ELF header -# opcode ModR/M SIB displacement immediate -# instruction mod, reg, Reg/Mem bits scale, index, base -# 1-3 bytes 0/1 byte 0/1 byte 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 0/1/2/4 bytes 0/1/2/4 bytes # result: EBX = 0 # 0: e_entry = 0x08048054 - bb 0/imm32 # copy 0 to EBX + bb 0/imm32 # copy 0 to EBX # counter: ECX = 1 - b9 1/imm32 # copy 1 to ECX + b9 1/imm32 # copy 1 to ECX # 10: loop: 0x0804805e # while (ECX <= 10) - 81 f9 10/imm32 # compare ECX, 10/imm - 7f 0a # jump-if-greater exit (+10) + 81 7/subop/compare 3/mod/direct 1/rm32/ecx 10/imm32 # compare ECX, 10/imm + 7f 10/disp8 # jump-if-greater exit # EBX += ECX - 01 cb # add ECX to EBX + 01 3/mod/direct 3/rm32/ebx 1/r32/ecx # add ECX to EBX # ECX++ - 81 c1 1/imm32 # add 1 to ECX + 81 0/subop/add 3/mod/direct 1/rm32/ecx 1/imm32 # add 1 to ECX # loop - eb ee # jump loop (-18; -00010010; 11101110) + eb -18/disp8 # jump loop # 28: exit: 0x08048070 # exit(EBX) - b8 1/imm32 # copy 1 to EAX - cd 128/imm8 # int 80h + b8 1/imm32 # copy 1 to EAX + cd 0x80/imm8 # int 80h # vim:ft=subx:nowrap |