Write a C program that would read an MIPS machine code file stored in hexadecima

Question

Write a C program that would read an MIPS machine code file stored in hexadecimal (*.hex) format and executes the machine code. The C code also prints and writes the values of all the MIPS registers before and after execution.

Requirements:

1. Reads a MIPS machine code file stored in hexadecimal format. Assume there are no loops in the code
2. Executes the opcode in a sequential fashion
3. Supports the following instructions from the MIPS reference ISA
- add, addi, addiu, addu, sub, subu
4. Before executing the machine code, prints (console) and write to a file the values of all the MIPS registers
5. Once the machine code is completely executed, print (console) and write to a file the values of all the MIPS registers.

# A demonstration of some simple MIPS instructions

   addi $t0, $t0, 5
   addi $t1, $t1, -2
   add $t2, $t0, $t1
   sub $t2, $t2, $t1

# Hex

21080005
2129fffe
01095020
01495022

Explanation / Answer

CODE :

#ifdef _WIN32

#include<windows.h>

#else

#include<sys/man.h>

#include<unistd.h>

#endif

#include<stdio.h>

#include<string.h>

int main()

{

                Char ocode[100];

FILE *fp;

If((fp=fopen(“mips.hex”,”r”))==NULL)

{

                printf(“ Unable to open MIPS file”);

                exit(1);

}

while(fgets(str,10,fp)!=NULL)

{

int code=atoi(str);

ocode[i++]=c;

                }

                fclose(fp);

                #ifdef _WIN32

                HANDLE memy_handle=CreatFileMappingA(INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READWRITE, 0, length, NULL);

#else

void* memry_map=mmap(NULL, sizeof(ocode));

((void(*)())memry_map)();

return 0;

}

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