For these questions remember to consult to the ARMv$7$ Architecture Reference Manual when in doubt.

$1.$ How does the word $0$xdec$0$ded$1$ appear in memory in a little$-$endian memory system and a big$-$endian

memory system.

Address Little$-$endian Big$-$endian

n

n$+1$

n$+2$

n$+3$

$2.$ Does the stack grow toward larger or smaller addresses?

$3.$ Assuming that SP is $0$x$0000\_2220$ initially, what is its value after executing the instruction PUSH $\{$r$0,$r$2\}?$

$4.$ Assuming that SP is $0$x$0000\_2010$ initially, what is its value after executing the instruction POP $\{$r$0-$r$7,$PC$\}?$

$5.$ Write the Thumb code to add five to the contents of register r$6.$

$6.$ Write the Thumb code to subtract $1000$ from the contents of register r$6,$ using r$3$ as a temporary register.

$7.$ Write the Thumb code to multiply the two $32-$bit in memory at addresses $0$x$1234\_5678$ and $0$x$7894\_5612,$

storing the result in address $0$x$2000\_0010.$

$8.$ Write the Thumb code to load register r$0$ with the letter $$E$$ if the number in r$12$ is even, or else the letter

$$O$$ if it is odd.

$9.$ Why would you use a BLX instruction rather than a BX instruction?

$10.$ Why would you use a BL instruction rather than a BLX instruction?

$11.$ Write the Thumb code to call a subroutine at address $0$x$6555\_8888.$ Where is the return address located?