diff options
Diffstat (limited to 'subx/examples/ex8.subx')
| -rw-r--r-- | subx/examples/ex8.subx | 60 |
1 files changed, 30 insertions, 30 deletions
diff --git a/subx/examples/ex8.subx b/subx/examples/ex8.subx index 3f5ebce5..fd7929f4 100644 --- a/subx/examples/ex8.subx +++ b/subx/examples/ex8.subx @@ -15,44 +15,44 @@ # Locals start from ESP-4 downwards. == 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 - # prolog - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP - # call ascii-length(argv[1]) + # prolog + 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + # call ascii-length(argv[1]) # push args - 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 ascii-length/disp32 + e8/call ascii-length/disp32 # discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP + 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 4/imm32 # add to ESP - # exit(EAX) - 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX - b8/copy-to-EAX 1/imm32/exit - cd/syscall 0x80/imm8 + # exit(EAX) + 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX + b8/copy-to-EAX 1/imm32/exit + cd/syscall 0x80/imm8 ascii-length: # (s) - # initialize s (EDX) - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 4/disp8 . # copy *(ESP+4) to EDX - # var result = 0 (EAX) - b8/copy-to-EAX 0/imm32 + # initialize s (EDX) + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none . 2/r32/EDX 4/disp8 . # copy *(ESP+4) to EDX + # var result = 0 (EAX) + b8/copy-to-EAX 0/imm32 $ascii-length-loop: - # var c = *s (ECX) - 8a/copy 0/mod/* 2/rm32/EDX . . . 1/r32/ECX . . # copy byte at *EDX to lower byte of ECX - # if c == '\0' break - 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0/imm32 # compare ECX - 74/jump-if-equal $ascii-length-ret/disp8 - # ++s - 81 0/subop/add 3/mod/direct 2/rm32/EDX . . . . . 1/imm32 # add to EDX - # ++result - 40/inc-EAX - # loop - eb/jump $ascii-length-loop/disp8 + # var c = *s (ECX) + 8a/copy 0/mod/* 2/rm32/EDX . . . 1/r32/ECX . . # copy byte at *EDX to lower byte of ECX + # if c == '\0' break + 81 7/subop/compare 3/mod/direct 1/rm32/ECX . . . . . 0/imm32 # compare ECX + 74/jump-if-equal $ascii-length-ret/disp8 + # ++s + 81 0/subop/add 3/mod/direct 2/rm32/EDX . . . . . 1/imm32 # add to EDX + # ++result + 40/inc-EAX + # loop + eb/jump $ascii-length-loop/disp8 $ascii-length-ret: - # return (result in EAX) - c3/return + # return (result in EAX) + c3/return # vim:nowrap:textwidth=0 |