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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
/**
* Definitions
* taken from elf.h linux header
* based on ELF specification
* based on ARM ELF specification
*/
typedef uint16_t Elf32_Half;
typedef uint32_t Elf32_Word;
typedef int32_t Elf32_Sword;
typedef uint32_t Elf32_Addr;
typedef uint32_t Elf32_Off;
typedef uint16_t Elf32_Section;
#define EI_NIDENT 16
typedef struct
{
unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
Elf32_Half e_type; /* Object file type */
Elf32_Half e_machine; /* Architecture */
Elf32_Word e_version; /* Object file version */
Elf32_Addr e_entry; /* Entry point virtual address */
Elf32_Off e_phoff; /* Program header table file offset */
Elf32_Off e_shoff; /* Section header table file offset */
Elf32_Word e_flags; /* Processor-specific flags */
Elf32_Half e_ehsize; /* ELF header size in bytes */
Elf32_Half e_phentsize; /* Program header table entry size */
Elf32_Half e_phnum; /* Program header table entry count */
Elf32_Half e_shentsize; /* Section header table entry size */
Elf32_Half e_shnum; /* Section header table entry count */
Elf32_Half e_shstrndx; /* Section header string table index */
}Elf32_Ehdr;
#define EI_MAG0 0 /* File identification byte 0 index */
#define ELFMAG0 0x7f /* Magic number byte 0 */
#define EI_MAG1 1 /* File identification byte 1 index */
#define ELFMAG1 'E' /* Magic number byte 1 */
#define EI_MAG2 2 /* File identification byte 2 index */
#define ELFMAG2 'L' /* Magic number byte 2 */
#define EI_MAG3 3 /* File identification byte 3 index */
#define ELFMAG3 'F' /* Magic number byte 3 */
#define EI_CLASS 4 /* File class byte index */
#define ELFCLASS32 1 /* 32-bit objects */
#define EI_DATA 5 /* Data encoding byte index */
#define ELFDATA2LSB 1 /* 2's complement, little endian */
#define EI_VERSION 6 /* File version byte index, Value must be EV_CURRENT */
#define EI_OSABI 7 /* OS ABI identification */
#define ELFOSABI_NONE 0 /* UNIX System V ABI */
#define ELFOSABI_ARM_AEABI 64 /* ARM EABI */
#define ELFOSABI_ARM 97 /* ARM */
#define EI_ABIVERSION 8 /* ABI version */
#define EI_PAD 9 /* Byte index of padding bytes */
#define ET_EXEC 2 /* Executable file */
#define EM_ARM 40 /* ARM */
#define EV_CURRENT 1 /* Current version */
#define EF_ARM_HASENTRY 0x0
#define SHN_UNDEF 0 /* Undefined section */
typedef struct
{
Elf32_Word p_type; /* Segment type */
Elf32_Off p_offset; /* Segment file offset */
Elf32_Addr p_vaddr; /* Segment virtual address */
Elf32_Addr p_paddr; /* Segment physical address */
Elf32_Word p_filesz; /* Segment size in file */
Elf32_Word p_memsz; /* Segment size in memory */
Elf32_Word p_flags; /* Segment flags */
Elf32_Word p_align; /* Segment alignment */
}Elf32_Phdr;
#define PT_LOAD 1 /* Loadable program segment */
#define PF_X (1 << 0) /* Segment is executable */
#define PF_W (1 << 1) /* Segment is writable */
#define PF_R (1 << 2) /* Segment is readable */
/**
* API
*/
enum elf_section_type_t
{
EST_LOAD,
EST_FILL
};
struct elf_section_t
{
uint32_t addr;
uint32_t size;
enum elf_section_type_t type;
/* <union> */
void *section;
uint32_t pattern;
/* </union> */
struct elf_section_t *next;
/* Internal to elf_output */
uint32_t offset;
};
struct elf_params_t
{
bool has_start_addr;
uint32_t start_addr;
struct elf_section_t *first_section;
struct elf_section_t *last_section;
};
typedef void (*elf_write_fn_t)(void *user, uint32_t addr, const void *buf, size_t count);
void elf_init(struct elf_params_t *params);
void elf_add_load_section(struct elf_params_t *params,
uint32_t load_addr, uint32_t size, const void *section);
void elf_add_fill_section(struct elf_params_t *params,
uint32_t fill_addr, uint32_t size, uint32_t pattern);
void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user);
bool elf_is_empty(struct elf_params_t *params);
void elf_set_start_addr(struct elf_params_t *params, uint32_t addr);
void elf_release(struct elf_params_t *params);
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