一些系统调用替换后出现了问题，可能与如下文件中的宏或函数有关，+号行后边的是一些好玩的东西

有些来自 linux-2.6.25，不同版本变化不太大，

1. linkage.h

             

#define prevent_tail_call(ret) __asm__ ("" : "=r" (ret) : "0" (ret))

  set_thread_flag(TIF_IRET);

#define asmlinkage_protect(n, ret, args...) \

__asmlinkage_protect##n(ret, ##args)

#define set_thread_flag(flag) \

set_ti_thread_flag(current_thread_info(), flag)

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

             

2.uaccess_32.h
28 #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
29 #define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
30
31 #define get_ds() (KERNEL_DS)
32 #define get_fs() (current_thread_info()->addr_limit)
33 #define set_fs(x) (current_thread_info()->addr_limit = (x))

 #define strlen_user(str) strnlen_user(str, LONG_MAX)
#define access_ok(type,addr,size) (likely(__range_ok(addr,size) == 0))
        get_user()
        put_user()


#define likely(x)    __builtin_expect(!!(x), 1) #define unlikely(x)    __builtin_expect(!!(x), 0)