#include <elf.h>
#include <stdio.h>
#include <string.h>

int main() {
    FILE *fp = fopen("hello", "w");
    Elf32_Ehdr eh;
    Elf32_Phdr ph;
    memset(&eh, 0, sizeof(Elf32_Ehdr));
    eh.e_ident[0] = 0x7f;
    eh.e_ident[1] = 'E';
    eh.e_ident[2] = 'L';
    eh.e_ident[3] = 'F';
    eh.e_ident[4] = 'H';
    eh.e_ident[5] = 'e';
    eh.e_ident[6] = 'l';
    eh.e_ident[7] = 'l';
    eh.e_ident[8] = 'o';
    eh.e_ident[9] = ' ';
    eh.e_ident[10] = 'w';
    eh.e_ident[11] = 'o';
    eh.e_ident[12] = 'r';
    eh.e_ident[13] = 'l';
    eh.e_ident[14] = 'd';
    eh.e_ident[15] = '!';
    eh.e_type = ET_EXEC;
    eh.e_machine = EM_386;
//    eh.e_version = EV_CURRENT; // can use
    eh.e_version = 0x0a1047c6;
//    eh.e_entry = 0x54-8-8;
    eh.e_entry = (char*)&eh.e_version - (char*)&eh.e_ident;
    eh.e_phoff = 52-8;
//    eh.e_shoff = 84; // can use
//    eh.e_flags = 0; // can use
    eh.e_shoff = 0x8d0d518d;
    eh.e_flags = 0xc1890441;
    eh.e_ehsize = 0x0eeb;
    eh.e_phentsize = 32;
//    eh.e_phnum = 1;
//    eh.e_shentsize = 0;
//    eh.e_shnum = 0;
//    eh.e_shstrndx = 0;

    ph.p_type = PT_LOAD;
    ph.p_offset = 0;
    ph.p_vaddr = 0;
//    ph.p_paddr = 0; // can use
    ph.p_paddr = 0x000aeb43; // can use
    ph.p_filesz = 76;
    ph.p_memsz = 76;
//    ph.p_flags = 7;
//    ph.p_align = 4096;

    fwrite(&eh, sizeof(Elf32_Ehdr)-8, 1, fp);
    fwrite(&ph, sizeof(Elf32_Phdr)-8, 1, fp);

    char buf[32];
    buf[0] = 0xff;
    buf[1] = 0xcd;
    buf[2] = 0x80;
    buf[3] = 0x93;
    buf[4] = 0x31;
    buf[5] = 0xdb;
    buf[6] = 0xcd;
    buf[7] = 0x80;
    fwrite(buf, 8, 1, fp);

    fclose(fp);
}