Open
Description
This issue tracks the effort to figure out the complier flags used to produce Diablo.exe (version 1.09b). It may be considered a subtask of #11, as given information about compiler flags, we can ensure that the same input source code produce the same output object code.
From what I can tell, it seems like /O1 is used rather than /O2. This is based on the padding between functions.
/O2 produces (given that #110 has been merged):
401000: e9 0b 00 00 00 jmp 0x401010
401005: 90 nop
401006: 90 nop
401007: 90 nop
401008: 90 nop
401009: 90 nop
40100a: 90 nop
40100b: 90 nop
40100c: 90 nop
40100d: 90 nop
40100e: 90 nop
40100f: 90 nop
401010: a1 28 b1 40 00 mov eax,ds:0x40b128
401015: a3 84 1a 41 00 mov ds:0x411a84,eax
40101a: c3 ret
40101b: 90 nop
40101c: 90 nop
40101d: 90 nop
40101e: 90 nop
40101f: 90 nop
401020: 8b 44 24 04 mov eax,DWORD PTR [esp+0x4]
401024: 85 c0 test eax,eax
401026: 74 0f je 0x401037
401028: 6a 00 push 0x0
40102a: 6a ff push 0xffffffff
40102c: 68 40 d0 40 00 push 0x40d040
401031: 50 push eax
401032: e8 69 0c 00 00 call 0x401ca0
401037: c3 ret While /O1 produces:
401000: e9 00 00 00 00 jmp 0x401005
401005: a1 28 c1 40 00 mov eax,ds:0x40c128
40100a: a3 84 2a 41 00 mov ds:0x412a84,eax
40100f: c3 ret
401010: 83 7c 24 04 00 cmp DWORD PTR [esp+0x4],0x0
401015: 74 12 je 0x401029
401017: 6a 00 push 0x0
401019: 6a ff push 0xffffffff
40101b: 68 40 e0 40 00 push 0x40e040
401020: ff 74 24 10 push DWORD PTR [esp+0x10]
401024: e8 8f 09 00 00 call 0x4019b8
401029: c3 ret This is to be compared to the original version of Diablo.exe (1.09b):
401000: e9 00 00 00 00 jmp 0x401005
401005: a1 00 94 47 00 mov eax,ds:0x479400
40100a: a3 30 79 4b 00 mov ds:0x4b7930,eax
40100f: c3 ret
401010: 83 7c 24 04 00 cmp DWORD PTR [esp+0x4],0x0
401015: 74 12 je 0x401029
401017: 6a 00 push 0x0
401019: 6a ff push 0xffffffff
40101b: 68 b0 30 48 00 push 0x4830b0
401020: ff 74 24 10 push DWORD PTR [esp+0x10]
401024: e8 8d 87 06 00 call 0x4697b6
401029: c3 ret Metadata
Metadata
Assignees
Labels
No labels