Question

Write an x86 assembly language program that performs equivalently to the C++ source code file shown below.Please note that commented out behavior must be implemented in x86 assembly language. There is no standard, portable way to perform some of these actions in C++.

#include void main()

{

// Use registers for these in your x86 assembly language program

// Only use the .data segment for string (character array) variables

int eax;

int esi;

int ecx;

int edi;

// Loop the following three times

for (ecx = 3; ecx > 0; --ecx) {

// Clear the screen

// Move the cursor to row 10, column 10

std::cout << "Enter a signed integer value: ";

std::cin >> eax;

edi = eax;

// Move the cursor to row 11, column 10

std::cout << "Enter a second signed integer value: ";

std::cin >> eax;

esi = eax;

eax = edi + esi;

std::cout << "The sum is: " << eax << std::endl;

eax = edi - esi;

std::cout << "The difference is: " << eax << std::endl;

// Pause for two seconds

}

system("PAUSE");

}

Answer 1

LC0:

.string "Enter a signed integer value: "

.LC1:

.string "Enter a second signed integer value: "

.LC2:

.string "The sum is: "

.LC3:

.string "The difference is: "

.LC4:

.string "PAUSE"

main:

push rbp

mov rbp, rsp

sub rsp, 16

mov DWORD PTR [rbp-4], 3

.L3:

cmp DWORD PTR [rbp-4], 0

jle .L2

mov esi, OFFSET FLAT:.LC0

mov edi, OFFSET FLAT:_ZSt4cout

call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)

lea rax, [rbp-16]

mov rsi, rax

mov edi, OFFSET FLAT:_ZSt3cin

call std::basic_istream<char, std::char_traits<char> >::operator>>(int&)

mov eax, DWORD PTR [rbp-16]

mov DWORD PTR [rbp-8], eax

mov esi, OFFSET FLAT:.LC1

mov edi, OFFSET FLAT:_ZSt4cout

call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)

lea rax, [rbp-16]

mov rsi, rax

mov edi, OFFSET FLAT:_ZSt3cin

call std::basic_istream<char, std::char_traits<char> >::operator>>(int&)

mov eax, DWORD PTR [rbp-16]

mov DWORD PTR [rbp-12], eax

mov edx, DWORD PTR [rbp-8]

mov eax, DWORD PTR [rbp-12]

add eax, edx

mov DWORD PTR [rbp-16], eax

mov esi, OFFSET FLAT:.LC2

mov edi, OFFSET FLAT:_ZSt4cout

call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)

mov rdx, rax

mov eax, DWORD PTR [rbp-16]

mov esi, eax

mov rdi, rdx

call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)

mov esi, OFFSET FLAT:ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6

mov rdi, rax

call std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))

mov eax, DWORD PTR [rbp-8]

sub eax, DWORD PTR [rbp-12]

mov DWORD PTR [rbp-16], eax

mov esi, OFFSET FLAT:.LC3

mov edi, OFFSET FLAT:_ZSt4cout

call std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)

mov rdx, rax

mov eax, DWORD PTR [rbp-16]

mov esi, eax

mov rdi, rdx

call std::basic_ostream<char, std::char_traits<char> >::operator<<(int)

mov esi, OFFSET FLAT:ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6

mov rdi, rax

call std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))

sub DWORD PTR [rbp-4], 1

jmp .L3

.L2:

mov edi, OFFSET FLAT:.LC4

call system

mov eax, 0

leave

ret

__static_initialization_and_destruction_0(int, int):

push rbp

mov rbp, rsp

sub rsp, 16

mov DWORD PTR [rbp-4], edi

mov DWORD PTR [rbp-8], esi

cmp DWORD PTR [rbp-4], 1

jne .L7

cmp DWORD PTR [rbp-8], 65535

jne .L7

mov edi, OFFSET FLAT:ZStL8_ioinit

call std::ios_base::Init::Init() [complete object constructor]

mov edx, OFFSET FLAT:__dso_handle

mov esi, OFFSET FLAT:ZStL8_ioinit

mov edi, OFFSET FLAT:_ZNSt8ios_base4InitD1Ev

call __cxa_atexit

.L7:

nop

leave

ret

GLOBAL_sub_I_main:

push rbp

mov rbp, rsp

mov esi, 65535

mov edi, 1

call __static_initialization_and_destruction_0(int, int)

pop rbp

ret

That's all