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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 strips off the first 0x1000 bytes
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//set $gp and zero .sbss and .bss
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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 0x1000
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#define ntohl(A) ((A>>24)|((A&0x00ff0000)>>8)|((A&0xff00)<<8)|(A<<24))
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enum {
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TEXT_OFFSET, TEXT_LENGTH,
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RDATA_OFFSET, RDATA_LENGTH,
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DATA_OFFSET, DATA_LENGTH,
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SDATA_OFFSET, SDATA_LENGTH,
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SBSS_OFFSET, SBSS_LENGTH,
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BSS_OFFSET, BSS_LENGTH
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};
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long code_start_offset=0x60;
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unsigned long map[12];
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long offset[]={
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0x58, 0x5c, //.text offset,length
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0x80, 0x84, //.rdata offset,length
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0xa8, 0xac, //.data offset,length
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0xd0, 0xd4, //.sdata offset,length
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0xf8, 0xfc, //.sbss offset,length
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0x120,0x124 //.bss offset,length
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};
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unsigned long load(char *ptr,unsigned long address)
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{
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unsigned long value;
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value=*(unsigned long*)(ptr+address);
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value=ntohl(value);
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return value;
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}
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void set_low(char *ptr,unsigned long address,unsigned long value)
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{
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unsigned long opcode;
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opcode=*(unsigned long*)(ptr+address);
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opcode=ntohl(opcode);
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opcode=(opcode&0xffff0000)|(value&0xffff);
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opcode=ntohl(opcode);
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*(unsigned long*)(ptr+address)=opcode;
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}
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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,*txtfile;
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FILE *infile,*outfile,*txtfile;
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unsigned char *buf;
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unsigned char *buf,*code;
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long size,i,j;
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long size,code_offset;
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unsigned long d;
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unsigned long i,d,gp_ptr;
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printf("test.exe -> code.txt & test2.exe\n");
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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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printf("Can't open test.exe");
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printf("Can't open test.exe");
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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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code_offset=load(buf,code_start_offset);
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printf("code_offset=0x%x\n",code_offset);
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code=buf+code_offset;
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/*load all of the segment offsets and lengths*/
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for(i=0;i<12;++i) {
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map[i]=load(buf,offset[i]);
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}
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if(code_offset<0x120) {
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printf("no .sdata\n");
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for(i=6;i<12;i+=2) {
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map[i]=map[4];
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map[i+1]=map[5];
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}
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} else if(code_offset<0x140) {
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printf("no .rdata\n");
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for(i=11;i>4;--i) {
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map[i]=map[i-2];
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}
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}
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for(i=0;i<12;i+=2) {
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printf("0x%x 0x%x\n",map[i],map[i+1]);
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}
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/*Initialize the $gp register for sdata and sbss*/
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gp_ptr=map[SDATA_OFFSET]+0x8000;
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printf("gp_ptr=0x%x\n",gp_ptr);
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/*modify the first opcodes in boot.asm*/
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/*modify the lui opcode*/
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set_low(code,0,gp_ptr>>16);
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/*modify the ori opcode*/
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set_low(code,4,gp_ptr&0xffff);
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/*Clear .sbss and .bss*/
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printf(".sbss=0x%x .bss_end=0x%x\n",
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map[SBSS_OFFSET],map[BSS_OFFSET]+map[BSS_LENGTH]);
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set_low(code,8,map[SBSS_OFFSET]);
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set_low(code,12,map[BSS_OFFSET]+map[BSS_LENGTH]);
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/*write out code.txt*/
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outfile=fopen("test2.exe","wb");
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outfile=fopen("test2.exe","wb");
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txtfile=fopen("code.txt","w");
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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=0;i<=map[SDATA_OFFSET]+map[SDATA_LENGTH];i+=4) {
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d=(buf[i]<<24)|(buf[i+1]<<16)|(buf[i+2]<<8)|buf[i+3];
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d=load(code,i);
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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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// d=0x04110000+(j&0xffff);
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// }
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fprintf(txtfile,"%8.8x\n",d);
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fprintf(txtfile,"%8.8x\n",d);
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fwrite(buf+i,4,1,outfile);
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fwrite(code+i,4,1,outfile);
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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(txtfile);
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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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