如何使用pid和不使用pid在linux中打印内核堆栈的低位和高位地址以进行处理

Question

How to print kernel stack's lower and upper address in linux for each process process

1. using pid and
2. without using pid

Answer 1

You may want to understand into the current_stack_pointer() code. (for the slightly older kernels, now the stack size has been increased to 16K)

The kernel stack starts on top of the page and increases downwards, %esp on x86 points (or %rsp on x86_64) to the bottom of stack. You can also derive the current macro as follows

current macro == current_thread_info(%esp)->task
current->pid == (current_thread_info(%esp)->task)->pid

As you know the bottom of the stack, you need to add/subtract the number of pages to get the top of the kernel stack (using %esp or %rsp depends on your arch).