db9445abd7
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28718 a1c6a512-1295-4272-9138-f99709370657
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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/**
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* Definitions
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* taken from elf.h linux header
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* based on ELF specification
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* based on ARM ELF specification
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*/
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typedef uint16_t Elf32_Half;
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typedef uint32_t Elf32_Word;
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typedef int32_t Elf32_Sword;
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typedef uint32_t Elf32_Addr;
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typedef uint32_t Elf32_Off;
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typedef uint16_t Elf32_Section;
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#define EI_NIDENT 16
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typedef struct
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{
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unsigned char e_ident[EI_NIDENT]; /* Magic number and other info */
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Elf32_Half e_type; /* Object file type */
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Elf32_Half e_machine; /* Architecture */
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Elf32_Word e_version; /* Object file version */
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Elf32_Addr e_entry; /* Entry point virtual address */
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Elf32_Off e_phoff; /* Program header table file offset */
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Elf32_Off e_shoff; /* Section header table file offset */
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Elf32_Word e_flags; /* Processor-specific flags */
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Elf32_Half e_ehsize; /* ELF header size in bytes */
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Elf32_Half e_phentsize; /* Program header table entry size */
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Elf32_Half e_phnum; /* Program header table entry count */
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Elf32_Half e_shentsize; /* Section header table entry size */
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Elf32_Half e_shnum; /* Section header table entry count */
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Elf32_Half e_shstrndx; /* Section header string table index */
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}Elf32_Ehdr;
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#define EI_MAG0 0 /* File identification byte 0 index */
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#define ELFMAG0 0x7f /* Magic number byte 0 */
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#define EI_MAG1 1 /* File identification byte 1 index */
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#define ELFMAG1 'E' /* Magic number byte 1 */
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#define EI_MAG2 2 /* File identification byte 2 index */
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#define ELFMAG2 'L' /* Magic number byte 2 */
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#define EI_MAG3 3 /* File identification byte 3 index */
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#define ELFMAG3 'F' /* Magic number byte 3 */
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#define EI_CLASS 4 /* File class byte index */
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#define ELFCLASS32 1 /* 32-bit objects */
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#define EI_DATA 5 /* Data encoding byte index */
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#define ELFDATA2LSB 1 /* 2's complement, little endian */
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#define EI_VERSION 6 /* File version byte index, Value must be EV_CURRENT */
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#define EI_OSABI 7 /* OS ABI identification */
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#define ELFOSABI_NONE 0 /* UNIX System V ABI */
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#define ELFOSABI_ARM_AEABI 64 /* ARM EABI */
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#define ELFOSABI_ARM 97 /* ARM */
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#define EI_ABIVERSION 8 /* ABI version */
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#define EI_PAD 9 /* Byte index of padding bytes */
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#define ET_EXEC 2 /* Executable file */
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#define EM_ARM 40 /* ARM */
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#define EV_CURRENT 1 /* Current version */
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#define EF_ARM_HASENTRY 0x00000002
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#define SHN_UNDEF 0 /* Undefined section */
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typedef struct
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{
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Elf32_Word p_type; /* Segment type */
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Elf32_Off p_offset; /* Segment file offset */
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Elf32_Addr p_vaddr; /* Segment virtual address */
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Elf32_Addr p_paddr; /* Segment physical address */
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Elf32_Word p_filesz; /* Segment size in file */
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Elf32_Word p_memsz; /* Segment size in memory */
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Elf32_Word p_flags; /* Segment flags */
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Elf32_Word p_align; /* Segment alignment */
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}Elf32_Phdr;
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#define PT_LOAD 1 /* Loadable program segment */
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#define PF_X (1 << 0) /* Segment is executable */
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#define PF_W (1 << 1) /* Segment is writable */
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#define PF_R (1 << 2) /* Segment is readable */
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/**
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* API
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*/
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enum elf_section_type_t
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{
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EST_LOAD,
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EST_FILL
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};
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struct elf_section_t
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{
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uint32_t addr;
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uint32_t size;
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enum elf_section_type_t type;
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/* <union> */
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void *section;
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uint32_t pattern;
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/* </union> */
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struct elf_section_t *next;
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/* Internal to elf_output */
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uint32_t offset;
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};
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struct elf_params_t
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{
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bool has_start_addr;
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uint32_t start_addr;
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struct elf_section_t *first_section;
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struct elf_section_t *last_section;
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};
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typedef void (*elf_write_fn_t)(void *user, uint32_t addr, const void *buf, size_t count);
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void elf_init(struct elf_params_t *params);
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void elf_add_load_section(struct elf_params_t *params,
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uint32_t load_addr, uint32_t size, const void *section);
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void elf_add_fill_section(struct elf_params_t *params,
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uint32_t fill_addr, uint32_t size, uint32_t pattern);
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void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user);
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bool elf_is_empty(struct elf_params_t *params);
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void elf_set_start_addr(struct elf_params_t *params, uint32_t addr);
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void elf_release(struct elf_params_t *params);
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