Please indicate which statements are correct and why (there
should be 2 correct statements).

Consider the following
snippet of code. Assume that instruction and memory addresses are 16-bits in
length, and are represented as hexadecimal numbers (e.g. Ox1080). The code runs
on a system that supports virtual memory as described in class – i.e., the
processor fetches from a virtual address stored in the PC register, and LOAD,
STORE memory operations use virtual addresses to reference memory. R1, R2 are
general-purpose registers.

Address Instruction

Ox0000 LOAD R1, Ox1020

Ox0002 STORE R1, Ox2040

Assume pages are 256 bytes in size (i.e. page
numbers are 8 bits long, and the page offset is also 8 bits long), and that the
following mappings are indexed by the page map address register:

Virtual Physical Permissions (R: Read, W:
Write, X: eXecute)

Ox0000 Ox1000 RX

Ox1000 Ox5000 RW

Ox2000 Ox3000 R

Select all the correct
statements:

The LOAD will raise an
exception when it is executed

The virtual-physical
address mappings are not valid because contiguous pages in the virtual address
space must map to contiguous page frames in physical memory

After the LOAD
instruction executes, R1 will have the contents of physical* memory location
Ox5020

The STORE will raise an
exception when it is executed

The STORE will raise an
exception when it is fetched