mirror of
https://github.com/alliedmodders/metamod-source.git
synced 2024-12-12 00:08:50 +01:00
97 lines
2.0 KiB
NASM
97 lines
2.0 KiB
NASM
;;;;
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;; (C)2005-2007 AlliedModders LLC
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;; By the Metamod:Source Development Team
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;; This software is licensed under the zlib/libpng free software license.
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;;
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;; This assembly file is a short thunk wrapper to let us load as a VSP and exit quietly,
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;; without any overhead of the rest of the interface, and also to prevent linking against
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;; tierX or vstdlib
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;;;;
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;;Exports:
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;; void GetBaseDir(char *buffer, maxlength);
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;; void *GetThisPointer();
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;;Imports:
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;; void LoadFunction();
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section .text
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global GetThisPointer, GetGameDir
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global _GetThisPointer, _GetGameDir
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extern _LoadFunction
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GetThisPointer:
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_GetThisPointer:
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mov eax, GLOBAL_POINTER
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ret
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GetGameDir:
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_GetGameDir:
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push ebp
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mov ebp, esp
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mov ecx, [engine] ;get this pointer
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mov edx, [ecx] ;get the vtable
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push dword [ebp+12] ;push maxlenth
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push dword [ebp+8] ;push buffer
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%ifdef LINUX
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push ecx ;push this pointer
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%endif
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call dword [edx+216] ;call IVEngineServer::GetGameDir
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%ifdef LINUX
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add esp, 12 ;correct stack
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%endif
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pop ebp
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ret
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thisLoadFunction:
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push ebp
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mov ebp, esp
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;get factory
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%ifdef LINUX
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mov eax, [ebp+12]
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%else
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mov eax, [ebp+8]
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%endif
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push dword 0 ;NULL
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push dword VENGINESERVER ;iface name
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call eax ;call factory
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add esp, 8 ;correct stack
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test eax, eax ;do we have a valid pointer?
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jz .end ;no, bail out
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mov [engine], eax ;store the engine pointer
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call _LoadFunction
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.end:
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;We never load, never ever ever!
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xor eax, eax
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pop ebp
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%ifdef LINUX
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ret
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%else
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retn 8
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%endif
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thisUnloadFunction:
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ret
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section .data
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INTERFACE_NAME DB "ISERVERPLUGINCALLBACKS001", 0
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VENGINESERVER DB "VEngineServer021", 0
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VIRTUAL_TABLE DD thisLoadFunction
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DD thisUnloadFunction
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;We don't need any more of the vtable here
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GLOBAL_POINTER DD VIRTUAL_TABLE
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temp_ret DD 0
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temp_ptr DD temp_ret
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engine DD 0
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