Hi,
I am trying to collect the user state of the process inside a new system call which I am trying to implement. I need to collect the following values inside the kernel.
1. The user stack pointer.
2. The values of the registers before the system call was attempted.
I am a kernel newbie and have read across various posts that the user stack pointer can be accessed by using the following logic.
(current_thread_info + THREAD_SIZE) returns the pointer to the pt_regs structure that holds these values. Unfortunately I am getting the value of the stack as 0.
I need to use the user space stack pointer to copy the values of the stack from the user to the kernel structures and then analyze the user stack. ( I would be using the copy_from_user() method to copy the contents of the stack to the kernel data structures which I am using inside my new system call)
Any code snippet would be greatly appreciated. Thanks a ton in advance for giving your time on this issue of mine.
Kalyan Chakravarthy
