asm_call中的问题

[HappyPiggy]

void asm_call(int addr)
{
    asm_add_byte((unsigned char)(0xe8));
    asm_add_dword((unsigned int)(0x00000002));
    asm_add_word((unsigned short)(0x06eb));
    asm_push(addr);
    asm_ret();
}

E8对应call 请教下其他的add是什么意思呢？