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//convert.c by Steve Rhoads 4/26/01

//This program takes a little-endian MIPS executable and

//converts it to a big-endian executable and changes

//absolute jumps to branches.

#include <stdio.h>

#include <stdlib.h>

#define BUF_SIZE (1024*1024)

#define CODE_OFFSET 0x200

int main(int argc,char *argv[])

{

   FILE *infile,*outfile;

   unsigned char *buf;

   long size,i,j;

   unsigned long d;

   infile=fopen("test.exe","rb");

   if(infile==NULL) {

      printf("Can't open test.exe");

      return 0;

   }

   buf=(unsigned char*)malloc(BUF_SIZE);

   size=fread(buf,1,BUF_SIZE,infile);

   fclose(infile);

   outfile=fopen("code.txt","w");

   infile=fopen("test2.exe","wb");

   for(i=CODE_OFFSET;i<size;i+=4) {

      d=(buf[i+3]<<24)|(buf[i+2]<<16)|(buf[i+1]<<8)|buf[i];

      if((d>>24)==0x0c) {          //JAL

         j=(d&0xfffff)-0x400-((i-CODE_OFFSET)>>2)-1;   //BGEZAL

         d=0x04110000+(j&0xffff);

      }

      if(i==CODE_OFFSET) {

         d=0x341d8000;  //ori $29,0,0x8000

      }

      fprintf(outfile,"%8.8x\n",d);

      fwrite(&d,4,1,infile);

   }

   fclose(outfile);

   fclose(infile);

   free(buf);

   return 0;

}