Consider the following source code, where k, l and m are constants declared with #define. The struct lnode is as defined from problem 1, repeated here:

struct lnode {
struct lnode *next; // points to next node address

char *str; // points to 16-character string

};

You will need to determine the values for k, l and m, which are the dimensions of a 3-D array named A.
struct lnode A[k][l][m];
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 gcc -O2 -S -fno-asynchronous-unwind-tables), gcc generates the following assembly code for the store_ele function:

store_ele:
movslq %esi, %rsi
movslq %edi, %rdi
movslq %edx, %rax
imulq $343 %rdi, %rdi
leaq (%rsi,%rsi,2), %rdx
salq $4, %rdx
addq %rsi, %rdx
addq %rdi, %rdx
addq %rax, %rdx
leaq A(%rip), %rax
salq $4, %rdx
addq %rax, %rdx
movl $268912, %eax
movq %rcx, (%rdx)
movq %r8, 8(%rdx)
ret
Use your reverse engineering skills to determine the values of k, l and m, based on the assembly code. Show your work and the steps required to determine k, l and m on the next page as answer 2.2. You may attach additional pages as needed. Place the discovered values for k, l and m in 2.1

I know that the maximum size of the array is 268912 and since its a struct its gonna be 16.

K*l*M*16 = 268912 and if dive 268 912 will get 16807. But I really dont know how to find K, L and M.

There's no other information that I can be added..This is the full question will all of the information.

There are many possible combination but according to me this should be the b c and d, and 13244 shoud be 13248 because size should be in multiple of 4.

b= 3 c= 12 d= 23

3*12*23 = 828 * 16 = 13248

Explanation:

#define b 3

#define c 12

#define d 23

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);}

assembly:

store_ele:

.LFB0:

.cfi_startproc

movslq %esi, %rsi

movslq %edi, %rdi

movslq %edx, %rax

imulq $276, %rdi, %rdi

leaq (%rsi,%rsi,2), %rdx

salq $3, %rdx

subq %rsi, %rdx

addq %rdi, %rdx

addq %rax, %rdx

leaq A(%rip), %rax

salq $4, %rdx

addq %rax, %rdx

movl $13248, %eax

movq %rcx, (%rdx)

movq %r8, 8(%rdx)

ret

the answer will be d

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