Assembly language [3 marks each] Each part of this problem gives a pseudo-code f
ID: 3597982 • Letter: A
Question
Assembly language
[3 marks each] Each part of this problem gives a pseudo-code fragment with an if-structure, and some assumptions about its variables. Give an assembly code fragment that is equivalent to the pseudo-code. Assume that general-purpose registers eax-edx are available for any task. Pseudo-Code Assumptions a) if count > value count andvalue are 32-bit, signed integers count is in eax, and value s in memory . then count : 0 end if; b)|If a+b=c 32-bit, signed a,b and c are integers, in memory checkis in ah . then check := 'Y, else check := 'N' end if; c)| if (c- a') and (c = 1A') and (cExplanation / Answer
Question a
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 100
.L4:
cmp DWORD PTR [rbp-4], 999
jle .L2
cmp DWORD PTR [rbp-8], 0
js .L3
.L2:
mov eax, DWORD PTR [rbp-8]
add DWORD PTR [rbp-4], eax
sub DWORD PTR [rbp-8], 1
jmp .L4
.L3:
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
mov eax, DWORD PTR [rbp-8]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
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 .L8
cmp DWORD PTR [rbp-8], 65535
jne .L8
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
.L8:
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
Question b
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 500
mov DWORD PTR [rbp-8], 0
.L3:
cmp DWORD PTR [rbp-8], 59
jg .L2
cmp DWORD PTR [rbp-4], 200
jle .L2
mov eax, DWORD PTR [rbp-8]
sub DWORD PTR [rbp-4], eax
add DWORD PTR [rbp-8], 5
jmp .L3
.L2:
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
mov eax, DWORD PTR [rbp-8]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
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: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
.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
Question c
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 0
mov DWORD PTR [rbp-8], 1
.L4:
mov eax, DWORD PTR [rbp-8]
add DWORD PTR [rbp-4], eax
add DWORD PTR [rbp-8], 1
cmp DWORD PTR [rbp-4], 5000
jg .L4
cmp DWORD PTR [rbp-8], 40
jne .L3
jmp .L4
.L3:
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
mov eax, DWORD PTR [rbp-8]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
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 .L8
cmp DWORD PTR [rbp-8], 65535
jne .L8
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
.L8:
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
Question d
main:
push rbp
mov rbp, rsp
sub rsp, 16
mov DWORD PTR [rbp-4], 1000
mov DWORD PTR [rbp-8], 100
.L3:
cmp DWORD PTR [rbp-8], 50
jle .L2
mov eax, DWORD PTR [rbp-8]
add eax, eax
sub DWORD PTR [rbp-4], eax
sub DWORD PTR [rbp-8], 1
jmp .L3
.L2:
mov eax, DWORD PTR [rbp-4]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
mov eax, DWORD PTR [rbp-8]
mov esi, eax
mov edi, OFFSET FLAT:std::cout
call std::basic_ostream<char, std::char_traits<char>> ::operator<<(int)
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: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
.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
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