Just a few pointers for everyone to look further: a. kernel space is (for Intel x86) Ring0, and userspace is Ring3, and so when u make transition between these two - u are subjected to HARDWARE control on how the stack space can be used. So Intel manual (System Programming 3a specifically) is useful to read. b. The keyword is "stack switching" (there exists a difference between 32bit vs 64bit). Look it up - chapter 5 (interrupt and exception handling). c. Essentially, kernelspace should always be protected from userspace manipulation, and so the stack registers for userspace is NOT used in kernelspace. And switch context occurred, the entire registers set is restored/saved into memory. -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
