elf                 8 kernel/elf.h     uchar elf[12];
elf                32 kernel/exec.c    struct elfhdr elf;
elf                48 kernel/exec.c    if(readi(ip, 0, (uint64)&elf, 0, sizeof(elf)) != sizeof(elf))
elf                52 kernel/exec.c    if(elf.magic != ELF_MAGIC)
elf                59 kernel/exec.c    for(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof(ph)){
elf               134 kernel/exec.c    p->trapframe->epc = elf.entry;  // initial program counter = main