Chapter 7.7, Problem 7.4PP

A.

Explanation of Solution

Hex address of the relocated reference to “sum”:

From the given Figure 7.12(a), the function “sum” in line 5 is

4004de: e8 05 00 00 00callq 4004e8 <sum>sum()

From the given Figure 7.12(a), the value of “ADDR(s)”, “ADDR(r.symbol)” and “r.addend” is given below

$\text{ADDR(s)}\text{=}\text{ADDR(}\text{.text)}\text{=}\text{0x4004d0}$

$\text{r}\text{.offset}\text{=}\text{0xf}$

$\text{r}\text{.addend}\text{=}\text{-4}$

Now calculate the reference address for given line using the below formula.

$\text{refaddr}\text{=}\text{ADDR(s)}\text{+}\text{r}$

B.

Explanation of Solution

Hex value of the relocated reference to “sum”:

From the given Figure 7.12(a), the function “sum” in line 5 is

4004de: e8 05 00 00 00callq 4004e8 <sum>sum()

From the given Figure 7.12(a), the value of “ADDR(s)”, “ADDR(r.symbol)” and “r.addend” is given below

$\text{ADDR(s)}\text{=}\text{ADDR(}\text{.text)}\text{=}\text{0x4004d0}$

$\text{r}\text{.offset}\text{=}\text{0xf}$

$\text{r}\text{.addend}\text{=}\text{-4}$

Now calculate the reference address for given line using the below formula.

$\text{refaddr}\text{=}\text{ADDR(s)}\text{+}\text{r}\text{.offset}$

Then,

$\begin{array}{c}\text{refaddr}\text{=}\text{ADDR(s)}\text{+}\text{r}\end{array}$