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    from Rev 26 to Rev 27
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Rev 26 → Rev 27

/trunk/tools/convert.c
1,17 → 1,57
//convert.c by Steve Rhoads 4/26/01
//This program strips off the first 0x1000 bytes
//set $gp and zero .sbss and .bss
#include <stdio.h>
#include <stdlib.h>
 
#define BUF_SIZE (1024*1024)
#define CODE_OFFSET 0x1000
#define ntohl(A) ((A>>24)|((A&0x00ff0000)>>8)|((A&0xff00)<<8)|(A<<24))
 
enum {
TEXT_OFFSET, TEXT_LENGTH,
RDATA_OFFSET, RDATA_LENGTH,
DATA_OFFSET, DATA_LENGTH,
SDATA_OFFSET, SDATA_LENGTH,
SBSS_OFFSET, SBSS_LENGTH,
BSS_OFFSET, BSS_LENGTH
};
 
long code_start_offset=0x60;
unsigned long map[12];
long offset[]={
0x58, 0x5c, //.text offset,length
0x80, 0x84, //.rdata offset,length
0xa8, 0xac, //.data offset,length
0xd0, 0xd4, //.sdata offset,length
0xf8, 0xfc, //.sbss offset,length
0x120,0x124 //.bss offset,length
};
 
unsigned long load(char *ptr,unsigned long address)
{
unsigned long value;
value=*(unsigned long*)(ptr+address);
value=ntohl(value);
return value;
}
 
void set_low(char *ptr,unsigned long address,unsigned long value)
{
unsigned long opcode;
opcode=*(unsigned long*)(ptr+address);
opcode=ntohl(opcode);
opcode=(opcode&0xffff0000)|(value&0xffff);
opcode=ntohl(opcode);
*(unsigned long*)(ptr+address)=opcode;
}
 
int main(int argc,char *argv[])
{
FILE *infile,*outfile,*txtfile;
unsigned char *buf;
long size,i,j;
unsigned long d;
unsigned char *buf,*code;
long size,code_offset;
unsigned long i,d,gp_ptr;
 
printf("test.exe -> code.txt & test2.exe\n");
infile=fopen("test.exe","rb");
if(infile==NULL) {
printf("Can't open test.exe");
20,20 → 60,57
buf=(unsigned char*)malloc(BUF_SIZE);
size=fread(buf,1,BUF_SIZE,infile);
fclose(infile);
 
code_offset=load(buf,code_start_offset);
printf("code_offset=0x%x\n",code_offset);
code=buf+code_offset;
/*load all of the segment offsets and lengths*/
for(i=0;i<12;++i) {
map[i]=load(buf,offset[i]);
}
if(code_offset<0x120) {
printf("no .sdata\n");
for(i=6;i<12;i+=2) {
map[i]=map[4];
map[i+1]=map[5];
}
} else if(code_offset<0x140) {
printf("no .rdata\n");
for(i=11;i>4;--i) {
map[i]=map[i-2];
}
}
for(i=0;i<12;i+=2) {
printf("0x%x 0x%x\n",map[i],map[i+1]);
}
 
/*Initialize the $gp register for sdata and sbss*/
gp_ptr=map[SDATA_OFFSET]+0x8000;
printf("gp_ptr=0x%x\n",gp_ptr);
/*modify the first opcodes in boot.asm*/
/*modify the lui opcode*/
set_low(code,0,gp_ptr>>16);
/*modify the ori opcode*/
set_low(code,4,gp_ptr&0xffff);
 
/*Clear .sbss and .bss*/
printf(".sbss=0x%x .bss_end=0x%x\n",
map[SBSS_OFFSET],map[BSS_OFFSET]+map[BSS_LENGTH]);
set_low(code,8,map[SBSS_OFFSET]);
set_low(code,12,map[BSS_OFFSET]+map[BSS_LENGTH]);
 
/*write out code.txt*/
outfile=fopen("test2.exe","wb");
txtfile=fopen("code.txt","w");
for(i=CODE_OFFSET;i<size;i+=4) {
d=(buf[i]<<24)|(buf[i+1]<<16)|(buf[i+2]<<8)|buf[i+3];
// if((d>>24)==0x0c) { //JAL
// j=(d&0xfffff)-0x400-((i-CODE_OFFSET)>>2)-1; //BGEZAL
// d=0x04110000+(j&0xffff);
// }
for(i=0;i<=map[SDATA_OFFSET]+map[SDATA_LENGTH];i+=4) {
d=load(code,i);
fprintf(txtfile,"%8.8x\n",d);
fwrite(buf+i,4,1,outfile);
fwrite(code+i,4,1,outfile);
}
fclose(outfile);
fclose(txtfile);
free(buf);
 
return 0;
}
 

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