File Projectweek4 cuit View aiyze Slons WindoW Heip Debug x86 • Local Windows Debugger Auto Seanlab4.asm* + x Solution Explorer 1 ;start of program 2 .386 3 4 . model flat,stdcall 6 .stack 4096 7 8...

Extracted text: File Projectweek4 cuit View aiyze Slons WindoW Heip Debug x86 • Local Windows Debugger Auto Seanlab4.asm* + x Solution Explorer 1 ;start of program 2 .386 3 4 . model flat,stdcall 6 .stack 4096 7 8 .data 10 11 eax"05" 12 ebx"02" 13 14 .code 15 main PROC 16 17 push "a"; pushes a value on to the stack 18 рop eax 19 20 ; swap the contents in the registers eax & ebx 21 22 push eax 23 24 mov eax, ebx; moves contents from register eax to ebx 25 main ENDP 26 ; end of program 27 END main


Extracted text: In this lab task you will use the PUSH and POP instructions to manage the transfer of data to and from the runtime stack. Write a program that uses only PUSH and POP instructions to exchange the values in the EAX and EBX registers. Testing Specification Store values into the EAX and EBX registers. Compile and run your program to validate that your program sequence of statements exchanges the original register values. Documentation Requirements Be sure to provide a commented out header that describes your program. Include in your header description the compiler that you used. Provide inline comments to document your solution. Background Discussion Assume that two values need to be swapped, such as is done in a number of commonly used Computer Science sorting algorithms. The typical high-level code is as follows: temp - num1: num1 - num2; num2 = temp: This could be implemented on a line-by-line basis in assembly language using registers, but that would require two instructions for reach line of code as follows: mov eax, num1 mov temp, eax mov eax, num2 mov num1, eax mov eax, temp mov num2, eax Understandably, the above seems inefficient. Instead of using registers and mov instructions, another possibility is to use the stack. Not only is a runtime stack a way to save and restore values, it can also be useful in swapping two values. Another method of swapping two values is to use the exchange instruction. However, for this lab you will use the push and pop instructions to swap two values.