/* elf.h - ELF64 loader for Pactor64 */
#ifndef _ELF_H
#define _ELF_H

#include "pactor64.h"

/* ELF magic bytes */
#define ELFMAG0  0x7F
#define ELFMAG1  'E'
#define ELFMAG2  'L'
#define ELFMAG3  'F'
#define ELFCLASS64 2
#define ELFDATA2LSB 1
#define ET_EXEC 2
#define EM_X86_64 62
#define PT_LOAD 1
#define PF_X 0x1
#define PF_W 0x2
#define PF_R 0x4

/* 64-bit ELF header */
typedef struct {
    uint8_t  e_ident[16];
    uint16_t e_type;
    uint16_t e_machine;
    uint32_t e_version;
    uint64_t e_entry;
    uint64_t e_phoff;
    uint64_t e_shoff;
    uint32_t e_flags;
    uint16_t e_ehsize;
    uint16_t e_phentsize;
    uint16_t e_phnum;
    uint16_t e_shentsize;
    uint16_t e_shnum;
    uint16_t e_shstrndx;
} __attribute__((packed)) elf64_ehdr_t;

/* 64-bit Program header */
typedef struct {
    uint32_t p_type;
    uint32_t p_flags;
    uint64_t p_offset;
    uint64_t p_vaddr;
    uint64_t p_paddr;
    uint64_t p_filesz;
    uint64_t p_memsz;
    uint64_t p_align;
} __attribute__((packed)) elf64_phdr_t;

/* ELF load result */
typedef struct {
    uint64_t entry;
    uint64_t load_base;
    uint64_t load_end;
    int      valid;
} elf64_load_result_t;

/* Validate and load an ELF64 executable */
elf64_load_result_t elf64_load(const void *file_data, uint32_t file_size);

/* Validate ELF header without loading */
int elf64_validate(const void *file_data, uint32_t file_size);

/* Get entry point from ELF header */
uint64_t elf64_get_entry(const void *file_data);

#endif /* _ELF_H */