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//convert.c by Steve Rhoads 4/26/01
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//convert.c by Steve Rhoads 4/26/01
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//This program takes a little-endian MIPS executable and
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//This program strips off the first 0x1000 bytes
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//converts it to a big-endian executable and changes
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//absolute jumps to branches.
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#define BUF_SIZE (1024*1024)
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#define BUF_SIZE (1024*1024)
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#define CODE_OFFSET 0x200
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#define CODE_OFFSET 0x1000
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int main(int argc,char *argv[])
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int main(int argc,char *argv[])
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{
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{
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FILE *infile,*outfile;
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FILE *infile,*outfile,*txtfile;
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unsigned char *buf;
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unsigned char *buf;
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long size,i,j;
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long size,i,j;
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unsigned long d;
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unsigned long d;
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infile=fopen("test.exe","rb");
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infile=fopen("test.exe","rb");
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if(infile==NULL) {
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if(infile==NULL) {
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return 0;
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return 0;
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}
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}
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buf=(unsigned char*)malloc(BUF_SIZE);
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buf=(unsigned char*)malloc(BUF_SIZE);
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size=fread(buf,1,BUF_SIZE,infile);
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size=fread(buf,1,BUF_SIZE,infile);
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fclose(infile);
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fclose(infile);
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outfile=fopen("code.txt","w");
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outfile=fopen("test2.exe","wb");
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infile=fopen("test2.exe","wb");
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txtfile=fopen("code.txt","w");
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for(i=CODE_OFFSET;i<size;i+=4) {
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for(i=CODE_OFFSET;i<size;i+=4) {
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d=(buf[i+3]<<24)|(buf[i+2]<<16)|(buf[i+1]<<8)|buf[i];
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d=(buf[i]<<24)|(buf[i+1]<<16)|(buf[i+2]<<8)|buf[i+3];
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if((d>>24)==0x0c) { //JAL
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// if((d>>24)==0x0c) { //JAL
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j=(d&0xfffff)-0x400-((i-CODE_OFFSET)>>2)-1; //BGEZAL
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// j=(d&0xfffff)-0x400-((i-CODE_OFFSET)>>2)-1; //BGEZAL
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d=0x04110000+(j&0xffff);
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// d=0x04110000+(j&0xffff);
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}
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// }
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if(i==CODE_OFFSET) {
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fprintf(txtfile,"%8.8x\n",d);
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d=0x341d8000; //ori $29,0,0x8000
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fwrite(buf+i,4,1,outfile);
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}
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fprintf(outfile,"%8.8x\n",d);
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fwrite(&d,4,1,infile);
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}
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}
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fclose(outfile);
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fclose(outfile);
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fclose(infile);
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fclose(txtfile);
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free(buf);
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free(buf);
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return 0;
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return 0;
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}
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}
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No newline at end of file
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No newline at end of file
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