Quoting MAASK Group <maask12345@hotmail.com>: > Hi, > I wanted to know how to convert the user-mode EIP value into the > virtual/physical address of the instruction it points to. Also is is > supposed to be fixed? Does a change in the user-mode EIP value indicate a > fault? > I checked the intel manual site... but couldnt not find out the exact > significance of the contents of the EIP register. > > Thanks in advance, > Asmita > (MAASK) > EIP holds the instruction pointer in intel architecture. EIP contains the linear address of the next instruction within the code segment to be executed.The combination of CS:EIP is called the logical address. In protected mode,this is acted upon by the segmentation unit (hardware) to get the linear address.This address can be thought of as an index in to the 4GB linear (virtual) address space of the process.This further gets acted upon by the paging unit to get converted to the physical address(actual RAM). So these are the series of steps that happen during address translation.Basically if the user mode EIP doesn't change you cannot execute the next instruction at all. For further reference read Intel arch manual Understanding linux kernel book. -sridhar -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
