2. a) (10 points) What C code line most likely created this assembly code? Assum

Question

2. a) (10 points) What C code line most likely created this assembly code? Assume A, B, C and D variables in assembly arex, y, z and w in C, respectively. b) (5 points) What is the result in A at the end of execution of this program? Assembly Program AREA e, CODE EXPORT main ENTRY main PROC LDR r2, B LDR r3, Ir21 LDR r2,-C LDR r5, [r2) ADD r3, r3, r5 LDR r2, D LDR r, [r2) SUB r3, r3, r5 LDR r2,A STR r3, [r2) AREA d, DATA A DCD DOD 5 C DCD 1 D DCD 2 ENDP END (15 points) For the six-bit binary values given below, find the equivalent decimal values when the data is interpreted as unsigned integers or signed integers. 3. 001111, 101011, 110110

Explanation / Answer

#include<stdio.h>
#include “CODE”

//A->x,B->y,C->z,D->w
struct {
   int n;
   unsigned int value : 1*n+1;
}BitField;

int main(){
   int *r2,r3,r5;
   r2=&y;
   r3=*r2;
   r2=&z;
   r5=*r2;
   r3=r3+r5;
   r2=&w;
   r5=*r2;
  
struct BitField k=(struct BitField *)malloc(sizeof( struct BitField));
k.n=0;
k.value=A;
printf(“%d”,k.value);

struct BitField k=(struct BitField *)malloc(sizeof( struct BitField));
k.n=5;
k.value=B;
printf(“%d”,k.value);

struct BitField k=(struct BitField *)malloc(sizeof( struct BitField));
k.n=1;
k.value=C;
printf(“%d”,k.value);

struct BitField k=(struct BitField *)malloc(sizeof( struct BitField));
k.n=2;
k.value=D;
printf(“%d”,k.value);
   return 0;
}

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