Editing SELF File Format

[[Category:Software]]<noinclude>[[Category:Main]]</noinclude>

= File Format =

== ELF Header ==

=== Struct ===

<source lang="C">
  typedef struct {
    uint8_t e_ident[16];              /* ELF identification */
    uint16_t e_type;                  /* object file type */
    uint16_t e_machine;               /* machine type */
    uint32_t e_version;               /* object file version */
    uint32_t e_entry;                 /* entry point address */
    uint32_t e_phoff;                 /* program header offset */
    uint32_t e_shoff;                 /* section header offset */
    uint32_t e_flags;                 /* processor-specific flags */
    uint16_t e_ehsize;                /* ELF header size */
    uint16_t e_phentsize;             /* size of program header entry */
    uint16_t e_phnum;                 /* number of program header entries */
    uint16_t e_shentsize;             /* size of section header entry */
    uint16_t e_shnum;                 /* number of section header entries */
    uint16_t e_shstrndx;              /* section name string table index */
  } __attribute__((packed)) ELF;
</source>

=== Table ===

{| class="wikitable sortable"
! Name of the variable !! Offset !! Size !! Notes
|-
| e_ident[0..3] || elf_offset+(0,1,2,3) || 4 || Magic
|-
| e_ident[4] || elf_offset+4 || 1 || Class Type must be [ELFCLASS32 = 0x01]
|-
| e_ident[5] || elf_offset+5 || 1 || Data Type must be [ELFDATA2LSB (i.e. le) = 0x01]
|-
| e_ident[6] || elf_offset+6 || 1 || File version (must be 0x1)
|-
| e_ident[7..15] || elf_offset+(6->15) || 1 || unused
|-
| e_type || elf_offset+0x10 || 2 || [[SELF_File_Format#SCE-specific_e_type|SCE-specific e_type]]
|-
| e_machine || elf_offset+0x12 || 2 || Machine type must be [EM_ARM = 0x0028]
|-
| e_version || elf_offset+0x14 || 4 || elf version (must be 0x00000001)
|-
| e_entry || elf_offset+0x18 ||    4 || Address to jump to in order to start program
|-
| e_phoff || elf_offset+0x1c ||    4 || boundary checked, but unused (already given by SELF header)
|-
| e_shoff || elf_offset+0x20 ||    4 || unused
|-
| e_flags || elf_offset+0x24 ||    4 || unused
|-
| e_ehsize || elf_offset+0x28 ||    2 || Must be sizeof(Elf32_Ehdr) = 0x0034
|-
| e_phentsize || elf_offset+0x2a ||    2 || Must be sizeof(Elf32_Phdr) = 0x0020
|-
| e_phnum || elf_offset+0x2c ||    2 || Count of Program Header in this elf
|-
| e_shentsize || elf_offset+0x2e ||    2 || unused
|-
| e_shnum || elf_offset+0x30 ||    2 || unused
|-
| e_shstrndx || elf_offset+0x32 ||    2 || unused
|}

== ELF Program Headers ==

=== Struct ===

<source lang="C">
  typedef struct {
    uint32_t p_type;                  /* type of segment */
    uint32_t p_flags;                 /* segment attributes */
    uint64_t p_offset;                /* offset in file */
    uint64_t p_vaddr;                 /* virtual address in memory */
    uint64_t p_paddr;                 /* reserved */
    uint64_t p_filesz;                /* size of segment in file */
    uint64_t p_memsz;                 /* size of segment in memory */
    uint64_t p_align;                 /* alignment of segment */
  } __attribute__((packed)) ELF_PHDR;
</source>

=== Table ===

=== Comments ===
See Spec here: [http://www.sco.com/developers/gabi/latest/ch5.pheader.html ELF Program Headers] 

== ELF Section Headers ==

=== Struct ===

<source lang="C">
  typedef struct {
    uint32_t sh_name;                 /* section name */
    uint32_t sh_type;                 /* section type */
    uint64_t sh_flags;                /* section attributes */
    uint64_t sh_addr;                 /* virtual address in memory */
    uint64_t sh_offset;               /* offset in file */
    uint64_t sh_size;                 /* size of section */
    uint32_t sh_link;                 /* link to other section */
    uint32_t sh_info;                 /* miscellaneous information */
    uint64_t sh_addralign;            /* address alignment boundary */
    uint64_t sh_entsize;              /* size of entries, if section has table */
  } __attribute__((packed)) ELF_SHDR;
</source>

=== Table ===

=== Comments ===