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zsnes call C initialization code from assembler.
Example backtrace:
Thread 1 "zsnes" received signal SIGSEGV, Segmentation fault.
=> 0xf7550275 <+37>: vmovdqa (%esp),%xmm1
...
#13 0x5699ef82 in InitSound () at linux/audio.c:336
#14 0x569a25af in initwinvideo () at linux/sdllink.c:1080
#15 0x5699fc13 in initvideo () at linux/sdllink.c:1298
#16 0x56f9d5bc in regptwa ()
#17 0x56a34b50 in SA1tableG ()
#18 0x56f84788 in selcB800 ()
...
Call to 'initwinvideo' (first C function) looks like that:
NEWSYM InitPreGame ; Executes before starting/continuing a game
mov byte[pressed+1],2
pushad
call Start60HZ
%ifdef __OPENGL__
call drawscreenwin
%endif
call initwinvideo
Note: pushad / call does not 16-byte maintain stack alignment
and breaks i386 ABI.
We apply realignment attribute to all functions noticed by users.
Bug: https://bugs.gentoo.org/503138
--- src/linux/sdllink.c.old
+++ src/linux/sdllink.c
@@ -773,11 +773,11 @@ BOOL InitInput()
{
InitJoystickInput();
return TRUE;
}
-int startgame()
+int __attribute__((force_align_arg_pointer)) startgame()
{
static bool ranonce = false;
int status;
if (!ranonce)
--- a/linux/sdllink.c
+++ b/linux/sdllink.c
@@ -897,7 +897,7 @@ bool OGLModeCheck()
return(cvidmode > 4);
}
-void initwinvideo(void)
+void __attribute__((force_align_arg_pointer)) initwinvideo(void)
{
DWORD newmode = 0;
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