exec.h

#ifndef EXEC_H
#define EXEC_H

#include <stdint.h>

// Format of an ELF executable file

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

// File header
struct elfhdr {
  uint32_t magic;  // must equal ELF_MAGIC
  uint8_t elf[12];
  uint16_t type;
  uint16_t machine;
  uint32_t version;
  uint32_t entry;
  uint32_t phoff;
  uint32_t shoff;
  uint32_t flags;
  uint16_t ehsize;
  uint16_t phentsize;
  uint16_t phnum;
  uint16_t shentsize;
  uint16_t shnum;
  uint16_t shstrndx;
};

// Program section header
struct proghdr {
  uint32_t type;
  uint32_t off;
  uint32_t vaddr;
  uint32_t paddr;
  uint32_t filesz;
  uint32_t memsz;
  uint32_t flags;
  uint32_t align;
};

// Values for Proghdr type
#define ELF_PROG_LOAD           1

extern void exec(void);
void execve(void);

#endif