Hooking address

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Hello,

I would like to do this in GCC,

[code]

void Hooks::NewSendFun()
{
    __asm__ (
           "mov [ppSendPacket],%esp\n\t"
            "pusha\n\t"
            "call SendPacketCallback\n\t"
            "popa\n\t"
            "jmp *%ulSendRet]\n\t"
            );
}

//and jmp from an address, like this
 *(char*)ulSend = 0xE9;
    //*(void **)((char *)ulSend + 1) = (void*)(((char*)(NewSendFun)) -
((char *)ulSend + 5));
    *(unsigned long*)(ulSend + 1) = ((unsigned long)NewSendFun - (unsigned
long)ulSend - 5);
[/code]

But none of it is working, ulSend(ret) is an unsigned long, the address I'm
trying to hook,

Thanks for reading.
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