#Virtual Computer Architecture

##Files:

###main.c This starts the execution of the Virtual CPU

###run auto-generated executable file

###vpc.h Decalare Registers Declare Variable's Declare Function protypes

###vpc.c

Main Program Declare Functions

##Vpc.c ###Functions:

int dump_memory(void * memoryPtr, unsigned int offset, unsigned int length)

Prompts user to enter a file_name and than writes X(hex) #of bytes to that file. will overwrite file contents, pending overwrite confirm

int load_file(void * memory, unsigned int max)

Prompts user to enter a file_name and than loads that file into memory up to MAX_MEM bytes

mem_modify(void * memoryPtr, unsigned int offset)

Ask user for a hex offset and hex length than begins modifying memory contents at that location until terminating character of '.' is reached

quit()

Terminate running of the virtual CPU

display_registers()

Display all registers and flags with their current values.

write_file(void * memory)

Prompts user to enter a file_name and than writes X(hex) #of bytes to that file. will overwrite file contents, pending overwrite confirm.

zero_registers()

Reset all registers to 0.

menu()

Menu function this displays the menu options

void instruction_cycle(void * memory)

Consists of a fetch and an excute for a particular instruction

void fetch(void * memory)

Fetch an instruction from memory at program counters address

uint32_t load_registers(uint32_t marValue, void * memory)

Load register with value in memory

void store_registers(uint32_t marValue, uint32_t mbrValue, void * memory)

Store current register into memory

void execute(void * memory)

Determine instruction type, determine the required fields than execute the that instruction.

int chk_branch()

Checks to see if a branch needs to be made this is done by checking condtion codes and flags.

int chk_register(int index)

Checks register field for the current PUSH/PULL instruction.

void flags(uint32_t alu)

This will check the alu and if it is not equal to zero the zero_flag will be set to 1, if the alu has all zeros the zero_flag is set to one.

int iscarry(uint32_t op1,uint32_t op2, uint8_t c)

Determine if a carry is generated by the addition of op1+op2+C