function calls inside a function
 

i am trying to develop my own OS for pentium board...

inside the task when i am calling a function from another function , PC is restarting....

For independent function calls, there is no problem....

Can somebody please help me out...............

only if you provide way more info.

inside ISR i am Saving registers, esp,ebp for the current task & restoring registers of new task......& jumping to the new task's IP from the ISR......if there are no function calls the OS is working fine...for one level of function call there is no problem....function call inside a function call is giving General Protection Fault.