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Unaligned stacks on i686-w64-mingw32 may lead to crashes

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Port of original SDL2 patch by Christopher Wellons (@skeeto, #7607)
to SDL3.
This commit is contained in:
Ozkan Sezer
2023-08-04 10:23:20 +03:00
committed by Ozkan Sezer
parent d3bcc3f057
commit 77446e2029
4 changed files with 25 additions and 5 deletions
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4
src/SDL.c
View File

@@ -632,9 +632,9 @@ SDL_bool SDL_IsTablet(void)
#ifdef __WIN32__
#if (!defined(HAVE_LIBC) || defined(__WATCOMC__)) && !defined(SDL_STATIC_LIB)
/* Need to include DllMain() on Watcom C for some reason.. */
/* FIXME: Still need to include DllMain() on Watcom C ? */
BOOL APIENTRY _DllMainCRTStartup(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
BOOL APIENTRY MINGW32_FORCEALIGN _DllMainCRTStartup(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call) {
case DLL_PROCESS_ATTACH:

9
src/core/SDL_runapp.c
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@@ -24,7 +24,14 @@
* If not, you can special case it here by appending || defined(__YOUR_PLATFORM__) */
#if ( !defined(SDL_MAIN_NEEDED) && !defined(SDL_MAIN_AVAILABLE) ) || defined(__ANDROID__)
DECLSPEC int
#if defined(__WIN32__) || defined(__WINRT__) || defined(__GDK__)
#include "windows/SDL_windows.h"
#endif
#ifndef MINGW32_FORCEALIGN
#define MINGW32_FORCEALIGN
#endif
DECLSPEC int MINGW32_FORCEALIGN
SDL_RunApp(int argc, char* argv[], SDL_main_func mainFunction, void * reserved)
{
char empty[1] = {0};

13
src/core/windows/SDL_windows.h
View File

@@ -76,6 +76,19 @@
#define WINVER _WIN32_WINNT
#endif
/* See https://github.com/libsdl-org/SDL/pull/7607 */
/* force_align_arg_pointer attribute requires gcc >= 4.2.x. */
#if defined(__clang__)
#define HAVE_FORCE_ALIGN_ARG_POINTER
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2))
#define HAVE_FORCE_ALIGN_ARG_POINTER
#endif
#if defined(__GNUC__) && defined(__i386__) && defined(HAVE_FORCE_ALIGN_ARG_POINTER)
#define MINGW32_FORCEALIGN __attribute__((force_align_arg_pointer))
#else
#define MINGW32_FORCEALIGN
#endif
#include <windows.h>
#include <basetyps.h> /* for REFIID with broken mingw.org headers */
#include <mmreg.h>

4
src/thread/windows/SDL_systhread.c
View File

@@ -53,12 +53,12 @@ static DWORD RunThread(void *data)
return 0;
}
static DWORD WINAPI RunThreadViaCreateThread(LPVOID data)
static DWORD WINAPI MINGW32_FORCEALIGN RunThreadViaCreateThread(LPVOID data)
{
return RunThread(data);
}
static unsigned __stdcall RunThreadViaBeginThreadEx(void *data)
static unsigned __stdcall MINGW32_FORCEALIGN RunThreadViaBeginThreadEx(void *data)
{
return (unsigned)RunThread(data);
}