xv6-65oo2/elf.h

#define ELF_MAGIC 0x464C457FU	/* "\x7FELF" in little endian */

struct elfhdr {
	uint magic;	// must equal ELF_MAGIC
	uchar elf[12];
	ushort type;
	ushort machine;
	uint version;
	uint entry;
	uint phoff;
	uint shoff;
	uint flags;
	ushort ehsize;
	ushort phentsize;
	ushort phnum;
	ushort shentsize;
	ushort shnum;
	ushort shstrndx;
};

struct proghdr {
	uint type;
	uint offset;
	uint va;
	uint pa;
	uint filesz;
	uint memsz;
	uint flags;
	uint align;
};

// Values for Proghdr type
#define ELF_PROG_LOAD		1

// Flag bits for Proghdr flags
#define ELF_PROG_FLAG_EXEC	1
#define ELF_PROG_FLAG_WRITE	2
#define ELF_PROG_FLAG_READ	4