Homework Answers
The storage of d at p is implemented by the instruction at line 3 of the assembly code.
Subtraction occur at line 6..so we have to work backwards to find the tyoes and ordering of the arguments x and C.
So the function prototype will be
int fun(short c , char d , int *p ,int x);
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A C function fun has the following code body: *p -d; return x-c; The IA32 code implementing this ...
WHAT is the value of A,B, and C Consider the following code fragment where the right-hand...
WHAT is the value of A,B, and C
Consider the following code fragment where the right-hand side of the assignments in func are to be completed by answering this question: typedef struct point { float *p; struct { float x; float y; }s; struct point* next; } point; void func(point *sp1, point* sp2) { sp2->p = A; sp2->S.X = B; sp2->s.y = c; int maino { point *init, *final; // assume init has been initialized to some value; func(init, final);...
the answer is movl 8(%ebp), %edx or movl 4(%ebp), %edx? Consider the following C and assembly...
the answer is movl 8(%ebp),
%edx or movl 4(%ebp), %edx?
Consider the following C and assembly code: int increment(int x){ return x+1; } increment: 1 push? 2 movl 3 movl 4 addl 5 6 popl ret %ebp %esp, %ebp 8(%ebp), %eax $1, %eax %ebp Suppose we want to move the return address into register %edx on line 5. Write 1 line of assembly code to perform this action. (Write your answer with exactly 2 spaces: one after the instruction, and...
For the C code 1 int loop while(int a, int b) int result 1; while (a < b) t result (atb); return ...
For the C code 1 int loop while(int a, int b) int result 1; while (a < b) t result (atb); return result; Gcc generates the following assembly code: %ebp+8, mov1 movl movl %ebp+12 at 8(%ebp) ,%ecx 12(%ebp) ,%ebx $1,%eax a at b 5 jge L11 leal (%ebx, %ecx), Xodx 8 L12: inull %eax , %eax addl $1,%ecx addl $1, edx cmp1 %ecx , %ebx 9 10 12 13 J8 14 ·L11: .L12 In generating this code, occ makes an...
A function, fun_a, has the following overall structure: int fun_a(unsigned x) I int val 0 while r...
A function, fun_a, has the following overall structure: int fun_a(unsigned x) I int val 0 while retura Th e Gcc Ccompiler generates the following assembly code: %ebp+8 novi movl test1 x at 8 (%ebp), %eax 80, %eax %edx, %eax 2 L.7 5 .L10 %eax, %edx し10 xor1 %eax shr1 Shift right by1 ne 9.L7 10 andl $1, %eax Reverse engineer the operation of this code and then do the following: A. Use the assembly-code version to fill in the missing...
Exercise 3 [Conditionals] Consider the following assembly code for a function F3 with two integer arguments:...
Exercise 3 [Conditionals] Consider the following assembly code for a function F3 with two integer arguments: F3: push EBP mov EBP, ESP mov EDX, DWORD PTR [ebp+12] mov EAX, DWORD PTR [ebp+8] cmp EAX, EDX # setup stack #if # goto .L1 #EAX- mov EAX, EDX # ignore for now mov DWORD PTR [EBP-4], EAX mov ESP, EBP pop EBE ret # cleanup stack To the right of each instruction, show the contents of the register whose value changes as...
Suppose we have C program, int foo(long s, long d) { char arr_a[11]; int...
Suppose we have C program, int foo(long s, long d) { char arr_a[11]; int i; arr_a[10] = 0; arr_s[10] = 0; for (i = 0; i < 5; i++) { if ((s == 1) && (d == 2)) { arr_a[i] = hello[4-i]; arr_s[i] = hello[4-i]; arr_a[i+5] = world[i]; arr_s[i+5] = world[i]; } else { arr_a[i+5] = hello[4-i]; arr_s[i+5] = hello[4-i]; arr_a[i] = world[i]; arr_s[i] =...
You know the following assembly code snippet is from a recursive function in C. You also...
You know the following assembly code snippet is from a recursive function in C. You also know that the stack contents at a particular point in time when we are in the recursive function are shown on the next page. Answer the following questions: a) how many Foo stack frames are on the stack? b) what is the return address back to the function that called Foo for the first time? c) what is the return address back into the...
Consider the following source code, where b, c, and d are constants declared with #define. You...
Consider the following source code, where b, c, and d are constants declared with #define. You will need to determine the values for b, c, and d. struct lnode { char *str; struct lnode *next; } struct lnode A[b][c][d]; int store_ele(int h, int i, int j, struct lnode dest) { A[h][i][j] = dest; return sizeof(A);} On compiling this program (with -O2), GCC generates the following assembly code for the store_ele function: store_ele: movslq %edi, %rdi movslq %esi, %rsi movslq %edx,...
In C code Directions: Write fully executable code when answering the following: 1. Write a function...
In C code Directions: Write fully executable code when answering the following: 1. Write a function prototype for a function called GetInput that takes no arguments. The function will ask, get, and then return a double value input from the user. 2. Write the function definition for GetInput 3. Write the function call to GetInput using the variable points that has already been declared
QUESTION 6 What is the output of following C code? struct numbers { int x...
QUESTION 6 What is the output of following C code? struct numbers { int x = 2; int y = 3; } int main() { struct numbers nums; nums.x = 110; nums.y = 100; printf("%d\n%d", nums.x, nums.y); return 0; } A. Compile-time Error B. 110 100 C. 2 3 D. Run-time Error 2 points QUESTION 7 What is the output of following C code? typedef struct student { char *stud; }s1; int main() { s1 s; s.stud...
WHAT is the value of A,B, and C
Consider the following code fragment where the right-hand side of the assignments in func are to be completed by answering this question: typedef struct point { float *p; struct { float x; float y; }s; struct point* next; } point; void func(point *sp1, point* sp2) { sp2->p = A; sp2->S.X = B; sp2->s.y = c; int maino { point *init, *final; // assume init has been initialized to some value; func(init, final);...
the answer is movl 8(%ebp),
%edx or movl 4(%ebp), %edx?
Consider the following C and assembly code: int increment(int x){ return x+1; } increment: 1 push? 2 movl 3 movl 4 addl 5 6 popl ret %ebp %esp, %ebp 8(%ebp), %eax $1, %eax %ebp Suppose we want to move the return address into register %edx on line 5. Write 1 line of assembly code to perform this action. (Write your answer with exactly 2 spaces: one after the instruction, and...
For the C code 1 int loop while(int a, int b) int result 1; while (a < b) t result (atb); return result; Gcc generates the following assembly code: %ebp+8, mov1 movl movl %ebp+12 at 8(%ebp) ,%ecx 12(%ebp) ,%ebx $1,%eax a at b 5 jge L11 leal (%ebx, %ecx), Xodx 8 L12: inull %eax , %eax addl $1,%ecx addl $1, edx cmp1 %ecx , %ebx 9 10 12 13 J8 14 ·L11: .L12 In generating this code, occ makes an...
A function, fun_a, has the following overall structure: int fun_a(unsigned x) I int val 0 while retura Th e Gcc Ccompiler generates the following assembly code: %ebp+8 novi movl test1 x at 8 (%ebp), %eax 80, %eax %edx, %eax 2 L.7 5 .L10 %eax, %edx し10 xor1 %eax shr1 Shift right by1 ne 9.L7 10 andl $1, %eax Reverse engineer the operation of this code and then do the following: A. Use the assembly-code version to fill in the missing...
Exercise 3 [Conditionals] Consider the following assembly code for a function F3 with two integer arguments: F3: push EBP mov EBP, ESP mov EDX, DWORD PTR [ebp+12] mov EAX, DWORD PTR [ebp+8] cmp EAX, EDX # setup stack #if # goto .L1 #EAX- mov EAX, EDX # ignore for now mov DWORD PTR [EBP-4], EAX mov ESP, EBP pop EBE ret # cleanup stack To the right of each instruction, show the contents of the register whose value changes as...
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