Write this code in MIPS in a .s file, run your code to verify its operation and
ID: 3733972 • Letter: W
Question
Write this code in MIPS in a .s file, run your code to verify its operation and output the result to screen using system calls
C++ code:
#include <iostream>
using namespace std;
// function declaration
void reverse(char [], int size);
void swap(char *x, char *y);
int main() {
char arr[] = "this is my string";
cout<<arr<<endl;
reverse(arr, 17);
cout<<arr<<endl;
return 0;
}
// function defination
void reverse(char arr[], int size) {
for(int i=0, j=size-1; i<j; i++, j--) {
swap(&arr[i], &arr[j]);
}
}
void swap(char *x, char *y) {
char t = *x;
*x = *y;
*y = t;
}
Explanation / Answer
main:
push rbp
mov rbp, rsp
sub rsp, 32
movabs rax, 2338328219631577204
movabs rdx, 7956016061199972717
mov QWORD PTR [rbp-32], rax
mov QWORD PTR [rbp-24], rdx
mov WORD PTR [rbp-16], 103
lea rax, [rbp-32]
mov rsi, rax
mov edi, OFFSET FLAT:std::cout
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 esi, OFFSET FLAT:std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)
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> >&))
lea rax, [rbp-32]
mov esi, 17
mov rdi, rax
call reverse(char*, int)
lea rax, [rbp-32]
mov rsi, rax
mov edi, OFFSET FLAT:std::cout
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 esi, OFFSET FLAT:std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)
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
reverse(char*, int):
push rbp
mov rbp, rsp
sub rsp, 32
mov QWORD PTR [rbp-24], rdi
mov DWORD PTR [rbp-28], esi
mov DWORD PTR [rbp-4], 0
mov eax, DWORD PTR [rbp-28]
sub eax, 1
mov DWORD PTR [rbp-8], eax
.L5:
mov eax, DWORD PTR [rbp-4]
cmp eax, DWORD PTR [rbp-8]
jge .L6
mov eax, DWORD PTR [rbp-8]
movsx rdx, eax
mov rax, QWORD PTR [rbp-24]
add rdx, rax
mov eax, DWORD PTR [rbp-4]
movsx rcx, eax
mov rax, QWORD PTR [rbp-24]
add rax, rcx
mov rsi, rdx
mov rdi, rax
call swap(char*, char*)
add DWORD PTR [rbp-4], 1
sub DWORD PTR [rbp-8], 1
jmp .L5
.L6:
nop
leave
ret
swap(char*, char*):
push rbp
mov rbp, rsp
mov QWORD PTR [rbp-24], rdi
mov QWORD PTR [rbp-32], rsi
mov rax, QWORD PTR [rbp-24]
movzx eax, BYTE PTR [rax]
mov BYTE PTR [rbp-1], al
mov rax, QWORD PTR [rbp-32]
movzx edx, BYTE PTR [rax]
mov rax, QWORD PTR [rbp-24]
mov BYTE PTR [rax], dl
mov rax, QWORD PTR [rbp-32]
movzx edx, BYTE PTR [rbp-1]
mov BYTE PTR [rax], dl
nop
pop rbp
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 .L10
cmp DWORD PTR [rbp-8], 65535
jne .L10
mov edi, OFFSET FLAT:std::__ioinit
call std::ios_base::Init::Init()
mov edx, OFFSET FLAT:__dso_handle
mov esi, OFFSET FLAT:std::__ioinit
mov edi, OFFSET FLAT:std::ios_base::Init::~Init()
call __cxa_atexit
.L10:
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
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.