PLT pointer destroyed problem when loading IR32_32.DLL (Indeo codec)

[Marcus Meissner]

On Wed, Mar 17, 2004 at 10:37:01PM +0000, Christian Costa wrote:
> Hi,
> 
> When executing the DllMain of the native IR32_32.DLL (VFW), Wine crashes.
> After some investigations, I found that a part of the code uses the EBX 
> register at one point without saving
> and restore it afterwards. Since this register contains the PLT pointer 
> for standard unix functions like libc ones, this
> does not take a long time for Wine to crashing.
> I tested with the ugly hack attached that saves and restores the EBX 
> register between the call to DllMain and that fixed the problem and
> the DLL works fine then.

This might happen.

Your fix is not really ok, you must not modify the stackpointer in asm statements.

Try using:
	__asm__ __volatile__ ("":::"ebx");

after entry(), which tells the compiler that ebx has been scrapped. 

Ciao, Marcus