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ee357_hw4_sol

ee357_hw4_sol - EE 357 Homework 4 Fall 08 Dubois Name Due...

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EE 357 Homework 4 Fall ’08·● Dubois Name: ___________________________________________ Due: Friday October 3 on blackboard Score: ________/100 Stacks and Subroutines 1.) (35) In addition to passing parameters in registers or by using the stack, another possible method is to provide space for them in the code itself. Study the code below to understand how this method works and answer the following questions. (Note that in this method we are going to explicitly change the return address that the BSR pushes onto the stack). Show any work on an extra page and submit that with your homework. Assume any uninitialized memory locations to be filled with 1s. a.) Before the call to SUB (BSR.L SUB), what are the longword contents of VAR_1, VAR_2, D0 and D4. b.) After program execution , what are the longword contents at locations VAR_1 and VAR_2 as well as the register contents of D0,D1,D4,D5,A4? c.) Show the word contents of the system stack just after the ASR instruction is executed d.) Show the machine code of the “BSR.L SUB” instruction d.) Machine code for the “BSR.L
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