Question

In: Computer Science

Take the following program from C++ and translate it into Pep/9 assembly language: #include <iostream> using...

Take the following program from C++ and translate it into Pep/9 assembly language:

#include <iostream>

using namespace std;

int theArray[] = { 5, 11, -29, 45, 9, -1};

void sumPos(int ary[], int len, int &sum)

{

   sum = 0;

   for (int i = 0; i < len; i++)

           if (ary[i] > 0)

               sum = sum + ary[i];

}

int main()

{

   int total;

   sumPos(theArray, 6, total);

   for (int k=0; k < 6; k++)

     cout << theArray[k] << endl;

cout << "Positive sum is " << total << endl;

   return 0;

}

Solutions

Expert Solution

Assembly Code for the given Program

theArray:

        .long   5

        .long   11

        .long   -29

        .long   45

        .long   9

        .long   -1

sumPos(int*, int, int&):

        push    rbp

        mov     rbp, rsp

        mov     QWORD PTR [rbp-24], rdi

        mov     DWORD PTR [rbp-28], esi

        mov     QWORD PTR [rbp-40], rdx

        mov     rax, QWORD PTR [rbp-40]

        mov     DWORD PTR [rax], 0

        mov     DWORD PTR [rbp-4], 0

.L4:

        mov     eax, DWORD PTR [rbp-4]

        cmp     eax, DWORD PTR [rbp-28]

        jge     .L5

        mov     eax, DWORD PTR [rbp-4]

        cdqe

        lea     rdx, [0+rax*4]

        mov     rax, QWORD PTR [rbp-24]

        add     rax, rdx

        mov     eax, DWORD PTR [rax]

        test    eax, eax

        jle     .L3

        mov     rax, QWORD PTR [rbp-40]

        mov     edx, DWORD PTR [rax]

        mov     eax, DWORD PTR [rbp-4]

        cdqe

        lea     rcx, [0+rax*4]

        mov     rax, QWORD PTR [rbp-24]

        add     rax, rcx

        mov     eax, DWORD PTR [rax]

        add     edx, eax

        mov     rax, QWORD PTR [rbp-40]

        mov     DWORD PTR [rax], edx

.L3:

        add     DWORD PTR [rbp-4], 1

        jmp     .L4

.L5:

        nop

        pop     rbp

        ret

.LC0:

        .string "Positive sum is "

main:

        push    rbp

        mov     rbp, rsp

        sub     rsp, 16

        lea     rax, [rbp-8]

        mov     rdx, rax

        mov     esi, 6

        mov     edi, OFFSET FLAT:theArray

        call    sumPos(int*, int, int&)

        mov     DWORD PTR [rbp-4], 0

.L8:

        cmp     DWORD PTR [rbp-4], 5

        jg      .L7

        mov     eax, DWORD PTR [rbp-4]

        cdqe

        mov     eax, DWORD PTR theArray[0+rax*4]

        mov     esi, eax

        mov     edi, OFFSET FLAT:_ZSt4cout

        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> >&))

        add     DWORD PTR [rbp-4], 1

        jmp     .L8

.L7:

        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*)

        mov     rdx, rax

        mov     eax, DWORD PTR [rbp-8]

        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, 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     .L12

        cmp     DWORD PTR [rbp-8], 65535

        jne     .L12

        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

.L12:

        nop

        leave

        ret

_GLOBAL__sub_I_theArray:

        push    rbp

        mov     rbp, rsp

        mov     esi, 65535

        mov     edi, 1

        call    __static_initialization_and_destruction_0(int, int)

        pop     rbp

        ret

Assembly Code in Binary

std::ostream::operator<<(std::ostream& (*)(std::ostream&))@plt:

jmp    QWORD PTR [rip+0x2fca]        # 404030 <std::ostream::operator<<(std::ostream& (*)(std::ostream&))@GLIBCXX_3.4>

push   0x3

jmp    401020 <.plt>

std::ios_base::Init::Init()@plt:

jmp    QWORD PTR [rip+0x2fc2]        # 404038 <std::ios_base::Init::Init()@GLIBCXX_3.4>

push   0x4

jmp    401020 <.plt>

std::ostream::operator<<(int)@plt:

jmp    QWORD PTR [rip+0x2fba]        # 404040 <std::ostream::operator<<(int)@GLIBCXX_3.4>

push   0x5

jmp    401020 <.plt>

std::ios_base::Init::~Init()@plt:

jmp    QWORD PTR [rip+0x2fb2]        # 404048 <std::ios_base::Init::~Init()@GLIBCXX_3.4>

push   0x6

jmp    401020 <.plt>

sumPos(int*, int, int&):

push   rbp

mov    rbp,rsp

mov    QWORD PTR [rbp-0x18],rdi

mov    DWORD PTR [rbp-0x1c],esi

mov    QWORD PTR [rbp-0x28],rdx

mov    rax,QWORD PTR [rbp-0x28]

mov    DWORD PTR [rax],0x0

mov    DWORD PTR [rbp-0x4],0x0

mov    eax,DWORD PTR [rbp-0x4]

cmp    eax,DWORD PTR [rbp-0x1c]

jge    4011ee <sumPos(int*, int, int&)+0x6c>

mov    eax,DWORD PTR [rbp-0x4]

cdqe   

lea    rdx,[rax*4+0x0]

mov    rax,QWORD PTR [rbp-0x18]

add    rax,rdx

mov    eax,DWORD PTR [rax]

test   eax,eax

jle    4011e8 <sumPos(int*, int, int&)+0x66>

mov    rax,QWORD PTR [rbp-0x28]

mov    edx,DWORD PTR [rax]

mov    eax,DWORD PTR [rbp-0x4]

cdqe   

lea    rcx,[rax*4+0x0]

mov    rax,QWORD PTR [rbp-0x18]

add    rax,rcx

mov    eax,DWORD PTR [rax]

add    edx,eax

mov    rax,QWORD PTR [rbp-0x28]

mov    DWORD PTR [rax],edx

add    DWORD PTR [rbp-0x4],0x1

jmp    4011a2 <sumPos(int*, int, int&)+0x20>

nop

pop    rbp

ret    

main:

push   rbp

mov    rbp,rsp

sub    rsp,0x10

lea    rax,[rbp-0x8]

mov    rdx,rax

mov    esi,0x6

mov    edi,0x404060

call   401182 <sumPos(int*, int, int&)>

mov    DWORD PTR [rbp-0x4],0x0

cmp    DWORD PTR [rbp-0x4],0x5

jg     401247 <main+0x56>

mov    eax,DWORD PTR [rbp-0x4]

cdqe   

mov    eax,DWORD PTR [rax*4+0x404060]

mov    esi,eax

mov    edi,0x404080

call   401080 <std::ostream::operator<<(int)@plt>

mov    esi,0x401030

mov    rdi,rax

call   401060 <std::ostream::operator<<(std::ostream& (*)(std::ostream&))@plt>

add    DWORD PTR [rbp-0x4],0x1

jmp    401216 <main+0x25>

mov    esi,0x402005

mov    edi,0x404080

call   401050 <std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)@plt>

mov    rdx,rax

mov    eax,DWORD PTR [rbp-0x8]

mov    esi,eax

mov    rdi,rdx

call   401080 <std::ostream::operator<<(int)@plt>

mov    esi,0x401030

mov    rdi,rax

call   401060 <std::ostream::operator<<(std::ostream& (*)(std::ostream&))@plt>

mov    eax,0x0

leave  

ret    

_GLOBAL__sub_I_theArray:

push   rbp

mov    rbp,rsp

mov    esi,0xffff

mov    edi,0x1

call   40127a <__static_initialization_and_destruction_0(int, int)>

pop    rbp

ret    

nop    DWORD PTR [rax]

venereology answered 1 year ago
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