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Re: Mach-O app calling CFM plug-in?

Subject: Re: Mach-O app calling CFM plug-in?
From: Philippe Casgrain <email@hidden>
Date: Tue, 29 Aug 2006 09:57:14 -0400
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George Warner a écrit :

On Mon, 28 Aug 2006 15:23:26 -0700, Wyatt Webb <email@hidden>
wrote:

In my code I call GetDiskFragment to find my CFM library. I then use
FindSymbol to get the function pointer I want. Then I pass that to
CFM2MachO. That gives me a Mach-O pointer I can now use.

The CFBundle API's will do all this for you.

That's good to know! Does it work on non-bundled plugins (e.g. 'cfrg' resource and data fork in one file)?

You only need to write the glue
code if the API you're calling requires a callback. That callback will have
to make the cross architecture call and you'll have to provide that glue
yourself.

Right. And, for the list's benefit, here is one way to do a callback from CFM into Mach-O (excerpt from http://www.mozilla.org/projects/plugins/plugin_scripting_ABI_technote.html):

----------------------------------------------


// glue for mapping outgoing Macho function pointers to TVectors
struct TFPtoTVGlue{
   void* glue[2];
};

static inline void* SetupFPtoTVGlue(TFPtoTVGlue* functionGlue, void* fp)
{
   functionGlue->glue[0] = fp;
   functionGlue->glue[1] = 0;
   return functionGlue;
}

----------------------------------------------

And for the list's benefit, here is the converse glue (CFM function to Mach-O function). It's virtually identical to what Wyatt proposed.

----------------------------------------------

static void* SetupTVtoFPGlue(TTVtoFPGlue* functionGlue, void* tvp)
{
   static const TTVtoFPGlue glueTemplate = { 0x3D800000, 0x618C0000, 0x800C0000, 0x804C0004, 0x7C0903A6, 0x4E800420 };

   memcpy(functionGlue, &glueTemplate, sizeof(TTVtoFPGlue));
   functionGlue->glue[0] |= ((UInt32)tvp >> 16);
   functionGlue->glue[1] |= ((UInt32)tvp & 0xFFFF);
   ::MakeDataExecutable(functionGlue, sizeof(TTVtoFPGlue));
   return functionGlue;
}

----------------------------------------------

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