Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Each function has its own stack frame between %fp and %sp. Let Caller calls Callee. Then Caller's %sp becomes callee's %fp, and callee's %sp set to be a new value (a smaller one because stack grows from large address to small address). You can think that Callee's stack frame is on top of Caller's stack frame.
In Caller: put arguments in %o0 to %o5 registers or if number of arguments more than 6, prepare values in call linkage of the current stack frame. Then "call" address_of_callee; %o7 stored the returned address. (This %o7 will becomes %i7 in callee after the callee executes save instruction.)
In Callee: it executes "save" instruction:
So at this point in callee, %i6 (%fp was caller's %o6) is set, and %o6 (%sp is set to be a new value). Question: where is the old %fp? It is stored somewhere in the top portion of the previous stack frame (see step 0.) The return address of Callee is stored in %i7. Is it possible to write a program to overflow this %i7? What return address that you really can overflow? Question: how to access that return address.
The "restore" instruction is the inverse function of save. Then the "ret" instruction should branch to %i7+8. The normal address should be %i7+4 as the next instruction address after call. The extra 4 is because sparc has a "branch delay" instruction that is executed BEFORE the call is made even it is put just after CALL. Is it strange. Not really. This is because modern CPU is a pipeline machine. It loads instruction every clock cycle, and branch (or jump or call) somewhat cannot be really done until the later stage the pipeline. And then it is already too late because the one JUST after this branch has already been executed. If you want to know more, you should take a look at computer architecture textbook which I think every graduate should know.
You should be very clear what return address in server.c is overflowed? Is it the return address of main() or the return address of copy()?
(a) Write a procedure (count-even n) that counts the number of even digits in the decimal representation of the number n. For example, (count-even 234) should return 2. (b) Writ
Program is to swap the two values which are enter by user: Program is to swap the two values which are enter by user through the function with values changed using pointers
For this program you will add and test 2 new member functions to the IntSLList class posted on the website. The two member functions are: insertByPosn(int el, int pos) Assuming t
C Program for REVERSE THE WORD IN STRING #include conio.h> #include stdio.h> #include string.h> void main() { char a[50],b[25][25],temp; i
Write a C program to compute the factorial of 5 i.e. 1x2x3x4x5 etc Write a C program to calculate the output Y for a given value of X for the following formula. Y=X 2
Why many companies are switching their current business language to PHP? Where PHP basically used? PHP is rapidly gaining popularity and numerous companies are switching their
Hi, Can i get a quote for my Programming assignment
A: you can exploit by overloading standard operators on a class, the intuition of the users of that class. This allow users program in the language of the problem domain instead of
exemples of many to many
This assignment document will be distributed from Blackboard assignment folder. Some parts of the assignments will require you to research answers from your text book (you must rea
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd