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| author | Kartik Agaram <vc@akkartik.com> | 2019-08-26 11:55:26 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2019-08-26 11:59:21 -0700 |
| commit | 333525360b22f3d3ea31db46a4d2f1b4edbfebdb (patch) | |
| tree | ed255f308542ba28a99d862d54d4992dcf749622 /examples/ex9.subx | |
| parent | 22fb844ba4edf14eb85245a35f42e721658c4f8e (diff) | |
| download | mu-333525360b22f3d3ea31db46a4d2f1b4edbfebdb.tar.gz | |
5592 - switch register names to lowercase
Diffstat (limited to 'examples/ex9.subx')
| -rw-r--r-- | examples/ex9.subx | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/examples/ex9.subx b/examples/ex9.subx index a580c749..8793e941 100644 --- a/examples/ex9.subx +++ b/examples/ex9.subx @@ -11,11 +11,11 @@ # 2 # # At the start of a SubX program: -# argc: *ESP -# argv[0]: *(ESP+4) -# argv[1]: *(ESP+8) +# argc: *esp +# argv[0]: *(esp+4) +# argv[1]: *(esp+8) # ... -# Locals start from ESP-4 downwards. +# Locals start from esp-4 downwards. == code 0x09000000 # instruction effective address register displacement immediate @@ -24,30 +24,30 @@ Entry: # . prolog - 89/copy 3/mod/direct 5/rm32/EBP . . . 4/r32/ESP . . # copy ESP to EBP + 89/copy 3/mod/direct 5/rm32/ebp . . . 4/r32/esp . . # copy esp to ebp # ascii-difference(argv[1], argv[2]) # . . push argv[2] - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 0xc/disp8 . # push *(EBP+12) + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 0xc/disp8 . # push *(ebp+12) # . . push argv[1] - ff 6/subop/push 1/mod/*+disp8 5/rm32/EBP . . . . 8/disp8 . # push *(EBP+8) + ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp . . . . 8/disp8 . # push *(ebp+8) # . . call e8/call ascii-difference/disp32 # . . discard args - 81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP - # syscall(exit, EAX) - 89/copy 3/mod/direct 3/rm32/EBX . . . 0/r32/EAX . . # copy EAX to EBX - b8/copy-to-EAX 1/imm32/exit + 81 0/subop/add 3/mod/direct 4/rm32/esp . . . . . 8/imm32 # add to esp + # syscall(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-difference: # (s1, s2) : null-terminated ascii strings - # a = first letter of s1 (ECX) - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 0/r32/EAX 4/disp8 . # copy *(ESP+4) to EAX - 8b/copy 0/mod/indirect 0/rm32/EAX . . . 0/r32/EAX . . # copy *EAX to EAX - # b = first letter of s2 (EDX) - 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/ESP 4/index/none 1/r32/ECX 8/disp8 # copy *(ESP+8) to ECX - 8b/copy 0/mod/indirect 1/rm32/ECX . . . 1/r32/ECX . . # copy *ECX to ECX + # a = first letter of s1 (ecx) + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 0/r32/eax 4/disp8 . # copy *(esp+4) to eax + 8b/copy 0/mod/indirect 0/rm32/eax . . . 0/r32/eax . . # copy *eax to eax + # b = first letter of s2 (edx) + 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 8/disp8 # copy *(esp+8) to ecx + 8b/copy 0/mod/indirect 1/rm32/ecx . . . 1/r32/ecx . . # copy *ecx to ecx # a-b - 29/subtract 3/mod/direct 0/rm32/EAX . . . 1/r32/ECX . . # subtract ECX from EAX + 29/subtract 3/mod/direct 0/rm32/eax . . . 1/r32/ecx . . # subtract ecx from eax c3/return == data 0x0a000000 |