The following code gives an example of a C program that calls a function. void adder(int a, int *b)

{

*b = a + *b; }

void main (void)

{

int x = 3, y = 4; adder(x, &y);

}

This 68000 program creates the following output from a compiler. The panel describes some of the instructions that are not obvious.

*1 void adder (int a, int *b)

Parameter a is at 8 (FP)

Parameter b is at 10 (FP)

adder

LINK FP, #0

*2 {

*3 *b = a + *b;

NOVEA. L 10 (FP) , A4

MOVE (A4) , D1

ADD 8 (FP) , D1

MOVE D1 , (A4)

*4 }

*5

*6 void main (void)

Variable x is at -2 (FP)

Variable y is at -4 (FP)

main

LINK FP , #-4

*7 {

*8 int x = 3, y = 4;

MOVE #3, -2 (FP)

MOVE #4, -4 (FP)

*9 adder (x, &y);

PEA -4 (FP)

MOVE #3, - (A7)

JSR adder

*10

*11 }

UNLK FP

RTS

Draw the state of the stack immediately after function adder is called in function main (i. e., the return address is on the top of the stack but no code in adder has yet been executed). Carefully label all items on the stack and give their location with respect to the current value of the frame pointer.

Draw a sequence of diagrams (i. e., memory maps) showing what happens to the stack as function adder is executed. Explain the action of each instruction that modifies the state of the stack. Show how parameters are passed to and from the function and how stack-based values are accessed.

Now you’re on your own. include a short summary of this section with plots in your lab report. write a matlab script file to do steps (a) through (d) below. include a listing of the script file with your report. 1 the soundsc(xx,fs) function requires two arguments: the first one (xx) contains the vector of data to be played, the second argument (fs) is the sampling rate for playing the samples. in addition, soundsc(xx,fs) does automatic scaling and then calls sound(xx,fs) to actually play the signal. mcclellan, schafer, and yoder, dsp first, 2e, isbn 0-13-065562-7. prentice hall, upper saddle river, nj 07458. c 2015 pearson education, inc. 4 mcclellan, schafer and yoder, signal processing first. prentice hall, upper saddle river, new jersey, 2003. c 2003 prentice hall. (a) generate a time vector (tt) to cover a range of t that will exhibit approximately two cycles of the 4000 hz sinusoids defined in the next part, part (b). use a definition for tt similar to part 2.2(d). if we use t to denote the period of the sinusoids, define the starting time of the vector tt to be equal to t , and the ending time as ct . then the two cycles will include t d 0. finally, make sure that you have at least 25 samples per period of the sinusoidal wave. in other words, when you use the colon operator to define the time vector, make the increment small enough to generate 25 samples per period. (b) generate two 4000 hz sinusoids with arbitrary amplitude and time-shift. x1.t / d a1 cos.2