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Pre-allocate some stack space to work around a problem with DLL alloca() code

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on a linux kernel.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1412 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
jkeil 2001-07-29 10:17:53 +00:00
parent 38060e5ee7
commit b0132b08f3
1 changed files with 12 additions and 10 deletions
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22
loader/pe_image.c
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@ -884,19 +884,23 @@ void PE_UnloadLibrary(WINE_MODREF *wm)
* due to the PROCESS_Create stuff.
*/
#if 0
/*
* so this is a dirty hack.
* Why do we need it?
*
* Disable it for now, let's see if it breaks something
* This is a dirty hack.
* The win32 DLLs contain an alloca routine, that first probes the soon
* to be allocated new memory *below* the current stack pointer in 4KByte
* increments. After the mem probing below the current %esp, the stack
* pointer is finally decremented to make room for the "alloca"ed memory.
* Maybe the probing code is intended to extend the stack on a windows box.
* Anyway, the linux kernel does *not* extend the stack by simply accessing
* memory below %esp; it segfaults.
* The extend_stack_for_dll_alloca() routine just preallocates a big chunk
* of memory on the stack, for use by the DLLs alloca routine.
*/
static void This_Is_Dirty_Hack(void)
static void extend_stack_for_dll_alloca(void)
{
void* mem=alloca(0x20000);
*(int*)mem=0x1234;
}
#endif
/* Called if the library is loaded or freed.
@ -939,9 +943,7 @@ WIN_BOOL PE_InitDLL( WINE_MODREF *wm, DWORD type, LPVOID lpReserved )
break;
}
TRACE("for %s\n", wm->filename);
#if 0
This_Is_Dirty_Hack();
#endif
extend_stack_for_dll_alloca();
retv = entry( wm->module, type, lpReserved );
}