mirror of https://github.com/OpenRCT2/OpenRCT2.git
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
#pragma region Copyright (c) 2014-2017 OpenRCT2 Developers
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/*****************************************************************************
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* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
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*
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* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
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* For more information, visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* A full copy of the GNU General Public License can be found in licence.txt
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*****************************************************************************/
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#pragma endregion
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#include "addresses.h"
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#if defined(__GNUC__)
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#ifdef __clang__
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#define DISABLE_OPT __attribute__((noinline,optnone))
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#else
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#define DISABLE_OPT __attribute__((noinline,optimize("O0")))
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#endif // __clang__
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#else
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#define DISABLE_OPT
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#endif // defined(__GNUC__)
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// This variable serves a purpose of identifying a crash if it has happened inside original code.
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// When switching to original code, stack frame pointer is modified and prevents breakpad from providing stack trace.
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volatile sint32 _originalAddress = 0;
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sint32 DISABLE_OPT RCT2_CALLPROC_X(sint32 address, sint32 _eax, sint32 _ebx, sint32 _ecx, sint32 _edx, sint32 _esi, sint32 _edi, sint32 _ebp)
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{
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sint32 result = 0;
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_originalAddress = address;
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#if defined(PLATFORM_X86) && !defined(NO_RCT2)
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#ifdef _MSC_VER
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__asm {
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push ebp
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push address
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mov eax, _eax
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mov ebx, _ebx
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mov ecx, _ecx
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mov edx, _edx
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mov esi, _esi
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mov edi, _edi
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mov ebp, _ebp
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call [esp]
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lahf
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pop ebp
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pop ebp
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/* Load result with flags */
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mov result, eax
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}
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#else
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__asm__ volatile ( "\
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\n\
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push %%ebx \n\
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push %%ebp \n\
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push %[address] \n\
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mov %[eax], %%eax \n\
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mov %[ebx], %%ebx \n\
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mov %[ecx], %%ecx \n\
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mov %[edx], %%edx \n\
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mov %[esi], %%esi \n\
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mov %[edi], %%edi \n\
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mov %[ebp], %%ebp \n\
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call *(%%esp) \n\
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lahf \n\
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add $4, %%esp \n\
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pop %%ebp \n\
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pop %%ebx \n\
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/* Load result with flags */ \n\
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mov %%eax, %[result] \n\
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" : [address] "+m" (address), [eax] "+m" (_eax), [ebx] "+m" (_ebx), [ecx] "+m" (_ecx), [edx] "+m" (_edx), [esi] "+m" (_esi), [edi] "+m" (_edi), [ebp] "+m" (_ebp), [result] "+m" (result)
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:
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: "eax","ecx","edx","esi","edi","memory"
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);
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#endif
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#endif // PLATFORM_X86
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_originalAddress = 0;
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// lahf only modifies ah, zero out the rest
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return result & 0xFF00;
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}
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