unionthread_union{ struct thread_infothread_info;// sizeof(thread_info) = unsigned longstack[THREAD_SIZE/sizeof(long)];//stack大小为8K,union联合体的地址是严格按照小端排布的,因此,内核栈的低位地址是thread_info结构体。 }; 整个8K的空间,顶部供
进程描述符task_struct结构中没有直接指向thread_info结构的指针,而是用一个void指针类型的成员表示,然后通过类型转换来访问thread_info结构。 stack指向了内核栈的地址(其实也就是thread_info和thread_union的地址),因为联合体中stack和thread_info都在起始地址, 因此可以很方便的转型 相关代码在include/linux/sched.h...
union thread_union{struct thread_info thread_info;unsigned long stack[THREAD_SIZE/sizeof(long)];};#defineTHREAD_SIZE16384#defineTHREAD_START_SP(THREAD_SIZE-16) 内核定义了一个thread_union的联合体,联合体的作用就是thread_info和stack共用一块内存区域。而THREAD_SIZE就是内核栈的大小,ARM64定义THREAD_S...
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