Failed to override Cocoa functions like NSLog, objc_msgSend

[szcoder]

Thank you for this project. I successfully use mach_override to replace local functions and stdio functions.
However I failed to override cocoa functions, for example, objc_msgSend and NSLog. The error is below

mach_override: some instructions unknown! Need to update mach_override.c
err = f8000001 /Volumes/Data/rentzsch-mach_star-b5c0803/mach_override/mach_override.c:226
err = f8000001 /Volumes/Data/rentzsch-mach_star-b5c0803/mach_override/mach_override.c:239
err = f8000001 /Volumes/Data/rentzsch-mach_star-b5c0803/mach_override/mach_override.c:245
err = f8000001 /Volumes/Data/rentzsch-mach_star-b5c0803/mach_override/mach_override.c:259
err = f8000001 /Volumes/Data/rentzsch-mach_star-b5c0803/mach_override/mach_override.c:264

I am using Xcode 4.2 and Mac OS X Lion 10.7.2, 64bit kernel and app. Can you please look into it? Many thanks.

[szcoder]

Below is the source of my test.m file

#import "objc/objc.h"
#import "objc/runtime.h"
#import "objc/message.h"

#include "stdio.h"
#include "mach_override.h"

id (*savedFuncPtr)(id obj, SEL sel, ...);

id my_msgSend(id obj, SEL sel, ...) {
printf("my_msgSend Called\n");
return nil;
}

int main(int argc, const char* argv[]) {
mach_override_ptr(objc_msgSend, my_msgSend, (void**)&savedFuncPtr);
//objc_msgSend(nil, nil);
return 0;
}