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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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//Now uses the ELF format (get gccmips_elf.zip)
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//set $gp and zero .sbss and .bss
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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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#include <string.h>
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#define BUF_SIZE (1024*1024)
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#define BUF_SIZE (1024*1024)
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/*Assumes running on PC little endian*/
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/*Assumes running on PC little endian*/
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#define ntohl(A) ((A>>24)|((A&0x00ff0000)>>8)|((A&0xff00)<<8)|(A<<24))
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#define ntohl(A) (((A)>>24)|(((A)&0x00ff0000)>>8)|(((A)&0xff00)<<8)|((A)<<24))
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#define ntohs(A) ((((A)&0xff00)>>8)|((A)<<8))
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#define CODE_START 0x60
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#define EI_NIDENT 16
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#define SECTION_START 0x4c
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#define SHT_PROGBITS 1
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#define SECTION_END 0x160
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#define SHT_STRTAB 3
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#define SECTION_SIZE 0x28
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#define SHT_NOBITS 8
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#define SECTION_OFFSET 0xc
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#define SECTION_LENGTH 0x10
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typedef struct {
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unsigned char e_ident[EI_NIDENT];
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struct header_t {
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unsigned short e_e_type;
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unsigned long text_offset,text_length;
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unsigned short e_machine;
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unsigned long rdata_offset,rdata_length;
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unsigned long e_version;
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unsigned long data_offset,data_length;
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unsigned long e_entry;
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unsigned long sdata_offset,sdata_length;
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unsigned long e_phoff;
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unsigned long sbss_offset,sbss_length;
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unsigned long e_shoff;
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unsigned long bss_offset,bss_length;
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unsigned long e_flags;
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} header;
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unsigned short e_ehsize;
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unsigned short e_phentsize;
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unsigned short e_phnum;
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unsigned short e_shentsize;
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unsigned short e_shnum;
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unsigned short e_shstrndx;
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} ElfHeader;
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typedef struct {
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unsigned long p_type;
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unsigned long p_offset;
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unsigned long p_vaddr;
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unsigned long p_paddr;
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unsigned long p_filesz;
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unsigned long p_memsz;
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unsigned long p_flags;
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unsigned long p_align;
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} Elf32_Phdr;
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typedef struct {
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unsigned long sh_name;
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unsigned long sh_type;
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unsigned long sh_flags;
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unsigned long sh_addr;
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unsigned long sh_offset;
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unsigned long sh_size;
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unsigned long sh_link;
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unsigned long sh_info;
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unsigned long sh_addralign;
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unsigned long sh_entsize;
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} Elf32_Shdr;
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unsigned long load(char *ptr,unsigned long address)
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#if 0
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unsigned long load(unsigned char *ptr,unsigned long address)
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{
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{
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unsigned long value;
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unsigned long value;
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value=*(unsigned long*)(ptr+address);
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value=*(unsigned long*)(ptr+address);
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value=ntohl(value);
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value=ntohl(value);
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return value;
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return value;
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}
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}
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unsigned short load_short(unsigned char *ptr,unsigned long address)
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{
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return (ptr[address]<<8)+ptr[address+1];
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}
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#endif
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void set_low(char *ptr,unsigned long address,unsigned long value)
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void set_low(char *ptr,unsigned long address,unsigned long value)
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{
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{
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unsigned long opcode;
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unsigned long opcode;
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opcode=*(unsigned long*)(ptr+address);
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opcode=*(unsigned long*)(ptr+address);
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opcode=ntohl(opcode);
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opcode=ntohl(opcode);
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Line 84... |
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,*code;
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unsigned char *buf,*code;
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long size,stack_pointer;
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long size,stack_pointer;
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unsigned long code_offset,index,name,offset,length,d,i,gp_ptr;
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unsigned long length,d,i,gp_ptr=0;
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unsigned long bss_start=0,bss_end=0;
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ElfHeader *elfHeader;
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Elf32_Phdr *elfProgram;
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Elf32_Shdr *elfSection;
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printf("test.exe -> code.txt & test2.exe\n");
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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=(unsigned char*)malloc(BUF_SIZE);
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memset(code,0,BUF_SIZE);
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code_offset=load(buf,CODE_START);
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elfHeader=(ElfHeader*)buf;
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printf("code_offset=0x%x ",code_offset);
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if(strncmp(elfHeader->e_ident+1,"ELF",3)) {
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code=buf+code_offset;
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printf("Error: Not an ELF file!\n");
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printf("Use the gccmips_elf.zip from opencores/projects/plasma!\n");
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/*load all of the segment offsets and lengths*/
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return -1;
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for(index=SECTION_START;index<code_offset-0x20;index+=SECTION_SIZE) {
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}
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name=load(buf,index);
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offset=load(buf,index+SECTION_OFFSET);
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elfHeader->e_entry=ntohl(elfHeader->e_entry);
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length=load(buf,index+SECTION_LENGTH);
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elfHeader->e_phoff=ntohl(elfHeader->e_phoff);
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switch(name) {
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elfHeader->e_shoff=ntohl(elfHeader->e_shoff);
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case 0x2e746578: /*.text*/
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elfHeader->e_phentsize=ntohs(elfHeader->e_phentsize);
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header.text_offset=offset;
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elfHeader->e_phnum=ntohs(elfHeader->e_phnum);
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header.text_length=length;
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elfHeader->e_shentsize=ntohs(elfHeader->e_shentsize);
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offset+=length;
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elfHeader->e_shnum=ntohs(elfHeader->e_shnum);
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length=0;
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header.rdata_offset=offset;
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header.rdata_length=length;
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header.data_offset=offset;
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header.data_length=length;
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header.sdata_offset=offset;
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header.sdata_length=length;
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header.sbss_offset=offset;
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header.sbss_length=length;
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header.bss_offset=offset;
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header.bss_length=length;
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break;
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case 0x2e726461: /*.rdata*/
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header.rdata_offset=offset;
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header.rdata_length=length;
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offset+=length;
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length=0;
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header.data_offset=offset;
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header.data_length=length;
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header.sdata_offset=offset;
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header.sdata_length=length;
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header.sbss_offset=offset;
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header.sbss_length=length;
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header.bss_offset=offset;
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header.bss_length=length;
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break;
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case 0x2e646174: /*.data*/
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header.data_offset=offset;
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header.data_length=length;
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offset+=length;
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length=0;
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header.sdata_offset=offset;
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header.sdata_length=length;
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header.sbss_offset=offset;
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header.sbss_length=length;
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header.bss_offset=offset;
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header.bss_length=length;
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break;
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case 0x2e736461: /*.sdata*/
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header.sdata_offset=offset;
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header.sdata_length=length;
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offset+=length;
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length=0;
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length=0;
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header.sbss_offset=offset;
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header.sbss_length=length;
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for(i=0;i<elfHeader->e_phnum;++i) {
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header.bss_offset=offset;
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elfProgram=(Elf32_Phdr*)(buf+elfHeader->e_phoff+elfHeader->e_phentsize*i);
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header.bss_length=length;
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elfProgram->p_offset=ntohl(elfProgram->p_offset);
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break;
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elfProgram->p_vaddr=ntohl(elfProgram->p_vaddr);
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case 0x2e736273: /*.sbss*/
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elfProgram->p_filesz=ntohl(elfProgram->p_filesz);
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header.sbss_offset=offset;
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elfProgram->p_memsz=ntohl(elfProgram->p_memsz);
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header.sbss_length=length;
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// printf("[0x%x,0x%x,0x%x]\n",elfProgram->p_vaddr,elfProgram->p_offset,elfProgram->p_filesz);
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offset+=length;
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memcpy(code+elfProgram->p_vaddr,buf+elfProgram->p_offset,elfProgram->p_filesz);
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length=0;
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length=elfProgram->p_vaddr+elfProgram->p_memsz;
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header.bss_offset=offset;
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}
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header.bss_length=length;
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break;
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for(i=0;i<elfHeader->e_shnum;++i) {
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case 0x2e627373: /*.bss*/
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elfSection=(Elf32_Shdr*)(buf+elfHeader->e_shoff+elfHeader->e_shentsize*i);
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header.bss_offset=offset;
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elfSection->sh_name=ntohl(elfSection->sh_name);
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header.bss_length=length;
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elfSection->sh_type=ntohl(elfSection->sh_type);
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break;
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elfSection->sh_addr=ntohl(elfSection->sh_addr);
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default: printf("unknown 0x%x\n",name);
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elfSection->sh_offset=ntohl(elfSection->sh_offset);
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elfSection->sh_size=ntohl(elfSection->sh_size);
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#if 0
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printf("{0x%x,0x%x:0x%x,0x%x,0x%x}\n",
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elfSection->sh_name,elfSection->sh_type,elfSection->sh_addr,
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elfSection->sh_offset,elfSection->sh_size);
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#endif
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#if 0
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if(elfSection->sh_type==SHT_PROGBITS||elfSection->sh_type==SHT_STRTAB) {
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// memcpy(code+elfSection->sh_addr,buf+elfSection->sh_offset,elfSection->sh_size);
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length=elfSection->sh_addr+elfSection->sh_size;
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bss_start=length;
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}
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#endif
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if(elfSection->sh_type==SHT_PROGBITS) {
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gp_ptr=elfSection->sh_addr;
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}
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if(elfSection->sh_type==SHT_NOBITS) {
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if(bss_start==0) {
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bss_start=elfSection->sh_addr;
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}
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bss_end=elfSection->sh_addr+elfSection->sh_size;
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}
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}
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}
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}
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if(bss_start==length) {
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bss_start=length;
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bss_end=length+4;
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}
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/*Initialize the $gp register for sdata and sbss*/
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/*Initialize the $gp register for sdata and sbss*/
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gp_ptr=header.sdata_offset+0x8000;
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gp_ptr+=0x7ff0;
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printf("gp_ptr=0x%x ",gp_ptr);
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printf("gp_ptr=0x%x ",gp_ptr);
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/*modify the first opcodes in boot.asm*/
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/*modify the first opcodes in boot.asm*/
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/*modify the lui opcode*/
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/*modify the lui opcode*/
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set_low(code,0,gp_ptr>>16);
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set_low(code,0,gp_ptr>>16);
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/*modify the ori opcode*/
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/*modify the ori opcode*/
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set_low(code,4,gp_ptr&0xffff);
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set_low(code,4,gp_ptr&0xffff);
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/*Clear .sbss and .bss*/
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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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printf(".sbss=0x%x .bss_end=0x%x\n",bss_start,bss_end);
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header.sbss_offset,header.bss_offset+header.bss_length);
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set_low(code,8,bss_start);
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set_low(code,8,header.sbss_offset);
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set_low(code,12,bss_end);
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set_low(code,12,header.bss_offset+header.bss_length);
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/*Set stack pointer*/
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/*Set stack pointer*/
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stack_pointer=header.bss_offset+header.bss_length+512;
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stack_pointer=bss_end+512;
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printf("Stack pointer=0x%x\n",stack_pointer);
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printf("Stack pointer=0x%x\n",stack_pointer);
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set_low(code,16,stack_pointer);
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set_low(code,16,stack_pointer);
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/*write out code.txt*/
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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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fwrite(code,length,1,outfile);
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fclose(outfile);
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txtfile=fopen("code.txt","w");
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txtfile=fopen("code.txt","w");
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for(i=0;i<=header.sdata_offset+header.sdata_length;i+=4) {
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for(i=0;i<=length;i+=4) {
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d=load(code,i);
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d=ntohl(*(unsigned long*)(code+i));
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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(code+i,4,1,outfile);
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}
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}
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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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