链接寄存器保存区存有被调用函数（而非当前函数）的链接寄存器内容。
The link register save area holds the link register contents of the function being called, rather than for the current function.
内存中的一块留用存储区，当程序中断产生时，CPU自动在其中保存程序计数器和工作寄存器的内容。
A reserved area of memory where the CPU automatically saves the program counter and the contents of working registers when a program interrupt occurs.
跟踪缓冲区并不保存栈顶或由寄存器所指向的内存的内容。
Trace buffer doesn't save top of stack or contents of memory referenced by registers.
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