ECE319K SI 9/5

C semantics

100

What does each line of C have to end with

semicolon(;)

200

What is the notation for the following boolean operations(operations that return a true or false)

Equals

Greater than

Less than or Equal than

And

Or

==

>

<=

&&

||

300

Write the following C equivalents 

ANDS

ORRS

ADDS

SUBS

EORS

LSLS

&

|

+

-

^

<<

400

What are 3 ways to write a loop in C that adds 1 to a variable x 10 times

int main(void){

  uint32_t x=0;

/* loop goes here */

}

for(int i=0; i++; i<10){
  x++;
}

int i=0;
while(i<10){
  x++;
  i++;
}

int i=0;
do{
  x++;
  i++;
} while(i<10);

500

The following C function takes input x and returns 1+2+3+...+x, Please write this function in Assembly

uint32_t factorial(uint_32 x){
  uint_32t output=0;
  while(x!=0){
    output = output + x;
    x--;
  }
  return output;
}

factorial:
MOVS R1, #0
loop:
CMP R0, #0
BNE done
ADDS R1, R1, R0
SUBS R0, #1
B loop
done:
MOVS R0, R1

C code blocks

100

what is the variable x equal to after the follow code is ran

int main(void){

uint_32t x =0;

x++;

x++;

}

2

200

what is the value of x after this code is ran

int main(void){
  uint32_x = 100;
  if(x>50){
    x = x+50;
  }
  if(x<100){
    x = x-75;
    if(x<100){
      x = 10;
  }

}
  if(x&&1){
    x++;
  }
}

150

300

what is the value of x after this code is ran

uint32_t max(uint32_t a, uint32_t b){
  if(a>b){
    return a;
  }
  return b;
}
int main(void){
  uint_32t x = 0;
  x = max( 12, 10);
  x = max( x , max(20,10));
}

20

400

what is the contents of array x[ ] after this is run

int main(void){

  uint_32t x[ ] = {1,2,3,4,5,6,7,8,9};
  for(int i =0; i<9; i++){
    x[i]=x[i]+i;
  }
}

{1,3,5,7,9,11,13,15,17}

MSPM0

100

How many bits does each register have

32

200

What is high voltage for an IO pin in the microcontroller

3.3V

ARM Assembly code blocks

100

What's in R0 after the following code is ran

MOVS R0, #7

ADDS R0, #2
SUBS R0, #4
MOVS R1, #3
ANDS R0, R1

#1

200

What is in R0 after the code is ran

MOVS R0, #6
MOVS R1, #5
EORS R0, R1
MOVS R2, #1
BICS R0, R2

#2

300

What is in R0 after the code is ran

LDR R0, =x00FF2398
LSLS R0, R0, #12
ASRS R0, R0, #8
LSRS R0, R0, 8

x00FFF239

400

The following addresses have these values

x20389488 F0
x20389489 12
x2038948A F5
x2038948B 90

What is in R0 after the following code is run

LDR R0, =x20389488
LDR R1, [R0]
LDRH R2, [R0, #2]
MOVS R3, #0
LDRSB R4, [R0, R3]
ADDS R0, R1, R2
ADDS R0, R0, R4

x90F5A3D5

500

What is in R1 after the following code is ran

MOVS R0, #4

MOVS R1, #6
MOVS R2, #1
PUSH{R0-R2}
POP{R1-R2}

#4

ARM Architecture

100

What binary value represents true

1

200

What registers are not free to use according to AACPS

anything other than R0-R3

300

What happens to the value of the stack pointer when you push 1 element to the stack

the stack pointer is decreased by 4

400

x23907984  F9
x23907985  10
x23907886  7C
x23907887  E2

what will be loaded if you read 32bits from address x23907984 little endian

E27C10F9

500

Where is the stack allocated in memory

in RAM