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robfinch |
#include "stdafx.h"
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void Elf64File_WriteHeader(Elf64File *f, FILE *fp)
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{
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f->hdr.e_ident[0] = 127;
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f->hdr.e_ident[1] = 'E';
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f->hdr.e_ident[2] = 'L';
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f->hdr.e_ident[3] = 'F';
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f->hdr.e_ident[4] = ELFCLASS64;
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f->hdr.e_ident[5] = ELFDATA2LSB;
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f->hdr.e_ident[6] = 1; // header version, always 1
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f->hdr.e_ident[7] = 255; // OS/ABI identification, 255 = standalone
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f->hdr.e_ident[8] = 255; // OS/ABI version
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f->hdr.e_ident[9] = 0; // reserved byte
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f->hdr.e_ident[10] = 0; // reserved byte
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f->hdr.e_ident[11] = 0; // reserved byte
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f->hdr.e_ident[12] = 0; // reserved byte
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f->hdr.e_ident[13] = 0; // reserved byte
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f->hdr.e_ident[14] = 0; // reserved byte
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f->hdr.e_ident[15] = 0; // reserved byte
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f->hdr.e_type = 2;
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f->hdr.e_machine = 888;
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f->hdr.e_version = 1;
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f->hdr.e_entry = 0;
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f->hdr.e_phoff = 160;
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f->hdr.e_shoff = 0;
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f->hdr.e_flags = 0;
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f->hdr.e_ehsize = Elf64HdrSize; // 64
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f->hdr.e_phentsize = 64;
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f->hdr.e_phnum = 4;
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f->hdr.e_shentsize = 0;
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f->hdr.e_shnum = 0;
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f->hdr.e_shstrndx = 0;
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}
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void Elf64File_WriteCodeSegmentHeader(FILE *fp)
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{
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Elf64Phdr hdr;
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hdr.p_type = 1; // loadable code
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hdr.p_flags = 1; // execute only
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hdr.p_offset = 512; // offset of segment in file
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hdr.p_vaddr = 4096; // virtual address
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hdr.p_paddr = 0; // physical address (not used)
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hdr.p_filesz = binndx; // size of segment in file
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hdr.p_memsz == binndx; // size of segment in memory
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hdr.p_align = 1; // alignment of segment in memory
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Elf64Phdr_Write(&hdr, fp);
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}
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void Elf64File_WriteDataSegmentHeader(FILE *fp)
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{
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Elf64Phdr hdr;
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hdr.p_type = 1; // loadable code
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hdr.p_flags = 6; // read/write only
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hdr.p_offset = 512 + binndx; // offset of segment in file
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hdr.p_vaddr = 4096;
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hdr.p_paddr = 0;
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hdr.p_filesz = sections[2].sect.index;
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hdr.p_memsz = sections[2].sect.index;
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hdr.p_align = 8;
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Elf64Phdr_Write(&hdr, fp);
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}
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void Elf64File_WriteBSSSegmentHeader(FILE *fp)
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{
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Elf64Phdr hdr;
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hdr.p_type = 1; // loadable code
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hdr.p_flags = 6; // read/write only
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hdr.p_offset = 512 + sections[0].sect.index + sections[1].sect.index + sections[2].sect.index; // offset of segment in file
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hdr.p_vaddr = sections[3].sect.start;
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hdr.p_paddr = 0;
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hdr.p_filesz = 0;
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hdr.p_memsz = sections[3].sect.index;
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hdr.p_align = 8;
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Elf64Phdr_Write(&hdr, fp);
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}
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void Elf64File_WriteTLSSegmentHeader(FILE *fp)
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{
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Elf64Phdr hdr;
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hdr.p_type = 1; // loadable code
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hdr.p_flags = 6; // read/write only
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hdr.p_offset = 512 + sections[0].sect.index + sections[1].sect.index + sections[2].sect.index; // offset of segment in file
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hdr.p_vaddr = 0;//tlsStart;
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hdr.p_paddr = 0;
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hdr.p_filesz = 0;
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hdr.p_memsz = sections[4].sect.index;
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hdr.p_align = 8;
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Elf64Phdr_Write(&hdr, fp);
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}
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void ElfSection_Write(Elf64Section *sect, FILE *fp)
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{
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fwrite((void *)(§->bytes),1,sect->length,fp);
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}
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void Elf64File_Write(Elf64File *f, FILE *fp)
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{
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int nn;
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Elf64File_WriteHeader(f, fp);
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fseek(fp, 512, SEEK_SET);
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for (nn = 0; nn < NumSections; nn++) {
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fseek(fp, sections[nn].sect.hdr.sh_offset, SEEK_SET);
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ElfSection_Write(§ions[nn].sect, fp);
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}
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fseek(fp, f->hdr.e_shoff, SEEK_SET);
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Elf64File_WriteSectionHeaderTable(fp);
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}
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void Elf64File_WriteProgramHeaderTable(FILE *fp)
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{
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fseek(fp, 160, SEEK_SET);
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Elf64File_WriteCodeSegmentHeader(fp);
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Elf64File_WriteDataSegmentHeader(fp);
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Elf64File_WriteBSSSegmentHeader(fp);
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Elf64File_WriteTLSSegmentHeader(fp);
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}
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