sleeping_thread_to_gdb_regs — Convert ptrace regs to GDB regs
A pointer to hold the registers in the order GDB wants.
The struct task_struct of the desired process.
Convert the register values of the sleeping process in p to the format that GDB expects. This function is called when kgdb does not have access to the struct pt_regs and therefore it should fill the gdb registers gdb_regs with what has been saved in struct thread_struct thread field during switch_to.