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ffix
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Michael Kerrisk
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178
man5/elf.5
178
man5/elf.5
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@ -116,25 +116,25 @@ The ELF header is described by the type Elf32_Ehdr or Elf64_Ehdr:
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#define EI_NIDENT 16
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typedef struct {
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unsigned char e_ident[EI_NIDENT];
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uint16_t e_type;
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uint16_t e_machine;
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uint32_t e_version;
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ElfN_Addr e_entry;
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ElfN_Off e_phoff;
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ElfN_Off e_shoff;
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uint32_t e_flags;
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uint16_t e_ehsize;
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uint16_t e_phentsize;
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uint16_t e_phnum;
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uint16_t e_shentsize;
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uint16_t e_shnum;
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uint16_t e_shstrndx;
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unsigned char e_ident[EI_NIDENT];
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uint16_t e_type;
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uint16_t e_machine;
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uint32_t e_version;
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ElfN_Addr e_entry;
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ElfN_Off e_phoff;
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ElfN_Off e_shoff;
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uint32_t e_flags;
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uint16_t e_ehsize;
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uint16_t e_phentsize;
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uint16_t e_phnum;
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uint16_t e_shentsize;
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uint16_t e_shnum;
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uint16_t e_shstrndx;
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} ElfN_Ehdr;
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.Ed
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.Pp
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The fields have the following meanings:
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.Bl -tag -width "e_phentsize" -offset indent
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.Bl -tag -width "e_phentsize"
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.It Dv e_ident
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This array of bytes specifies to interpret the file,
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independent of the processor or the file's remaining contents.
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@ -499,26 +499,26 @@ The ELF program header is described by the type Elf32_Phdr or Elf64_Phdr
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depending on the architecture:
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.Bd -literal -offset indent
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typedef struct {
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uint32_t p_type;
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Elf32_Off p_offset;
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Elf32_Addr p_vaddr;
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Elf32_Addr p_paddr;
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uint32_t p_filesz;
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uint32_t p_memsz;
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uint32_t p_flags;
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uint32_t p_align;
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uint32_t p_type;
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Elf32_Off p_offset;
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Elf32_Addr p_vaddr;
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Elf32_Addr p_paddr;
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uint32_t p_filesz;
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uint32_t p_memsz;
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uint32_t p_flags;
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uint32_t p_align;
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} Elf32_Phdr;
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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uint32_t p_type;
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uint32_t p_flags;
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Elf64_Off p_offset;
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Elf64_Addr p_vaddr;
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Elf64_Addr p_paddr;
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uint64_t p_filesz;
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uint64_t p_memsz;
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uint64_t p_align;
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uint32_t p_type;
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uint32_t p_flags;
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Elf64_Off p_offset;
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Elf64_Addr p_vaddr;
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Elf64_Addr p_paddr;
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uint64_t p_filesz;
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uint64_t p_memsz;
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uint64_t p_align;
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} Elf64_Phdr;
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.Ed
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.Pp
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@ -526,7 +526,7 @@ The main difference between the 32-bit and the 64-bit program header lies
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in the location of the
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.Sy p_flags
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member in the total struct.
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.Bl -tag -width "p_offset" -offset indent
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.Bl -tag -width "p_offset"
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.It Dv p_type
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This member of the Phdr struct tells what kind of segment this array
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element describes or how to interpret the array element's information.
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@ -702,35 +702,35 @@ reserved indices.
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The section header has the following structure:
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.Bd -literal -offset indent
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typedef struct {
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uint32_t sh_name;
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uint32_t sh_type;
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uint32_t sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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uint32_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint32_t sh_addralign;
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uint32_t sh_entsize;
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uint32_t sh_name;
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uint32_t sh_type;
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uint32_t sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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uint32_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint32_t sh_addralign;
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uint32_t sh_entsize;
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} Elf32_Shdr;
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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uint32_t sh_name;
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uint32_t sh_type;
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uint64_t sh_flags;
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Elf64_Addr sh_addr;
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Elf64_Off sh_offset;
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uint64_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint64_t sh_addralign;
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uint64_t sh_entsize;
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uint32_t sh_name;
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uint32_t sh_type;
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uint64_t sh_flags;
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Elf64_Addr sh_addr;
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Elf64_Off sh_offset;
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uint64_t sh_size;
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uint32_t sh_link;
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uint32_t sh_info;
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uint64_t sh_addralign;
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uint64_t sh_entsize;
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} Elf64_Shdr;
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.Ed
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.Pp
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No real differences exist between the 32-bit and 64-bit section headers.
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.Bl -tag -width "sh_addralign" -offset indent
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.Bl -tag -width "sh_addralign"
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.It Dv sh_name
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This member specifies the name of the section.
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Its value is an index
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@ -905,7 +905,7 @@ fixed-size entries.
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.El
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.Pp
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Various sections hold program and control information:
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.Bl -tag -width ".shstrtab" -offset indent
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.Bl -tag -width ".shstrtab"
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.It .bss
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This section holds uninitialized data that contributes to the program's
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memory image.
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@ -1160,28 +1160,28 @@ A symbol table
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index is a subscript into this array.
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.Bd -literal -offset indent
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typedef struct {
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uint32_t st_name;
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Elf32_Addr st_value;
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uint32_t st_size;
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unsigned char st_info;
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unsigned char st_other;
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uint16_t st_shndx;
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uint32_t st_name;
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Elf32_Addr st_value;
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uint32_t st_size;
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unsigned char st_info;
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unsigned char st_other;
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uint16_t st_shndx;
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} Elf32_Sym;
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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uint32_t st_name;
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unsigned char st_info;
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unsigned char st_other;
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uint16_t st_shndx;
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Elf64_Addr st_value;
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uint64_t st_size;
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uint32_t st_name;
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unsigned char st_info;
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unsigned char st_other;
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uint16_t st_shndx;
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Elf64_Addr st_value;
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uint64_t st_size;
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} Elf64_Sym;
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.Ed
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.Pp
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The 32-bit and 64-bit versions have the same members, just in a different
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order.
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.Bl -tag -width "st_value" -offset indent
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.Bl -tag -width "st_value"
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.It Dv st_name
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This member holds an index into the object file's symbol string table,
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which holds character representations of the symbol names.
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@ -1293,33 +1293,33 @@ Relocation entries are these data.
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Relocation structures that do not need an addend:
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.Bd -literal -offset indent
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typedef struct {
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Elf32_Addr r_offset;
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uint32_t r_info;
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Elf32_Addr r_offset;
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uint32_t r_info;
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} Elf32_Rel;
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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Elf64_Addr r_offset;
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uint64_t r_info;
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Elf64_Addr r_offset;
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uint64_t r_info;
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} Elf64_Rel;
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.Ed
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.Pp
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Relocation structures that need an addend:
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.Bd -literal -offset indent
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typedef struct {
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Elf32_Addr r_offset;
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uint32_t r_info;
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int32_t r_addend;
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Elf32_Addr r_offset;
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uint32_t r_info;
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int32_t r_addend;
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} Elf32_Rela;
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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Elf64_Addr r_offset;
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uint64_t r_info;
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int64_t r_addend;
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Elf64_Addr r_offset;
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uint64_t r_info;
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int64_t r_addend;
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} Elf64_Rela;
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.Ed
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.Bl -tag -width "r_offset" -offset indent
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.Bl -tag -width "r_offset"
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.It Dv r_offset
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This member gives the location at which to apply the relocation action.
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For a relocatable file, the value is the byte offset from the beginning
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@ -1352,25 +1352,25 @@ The d_tag member controls the interpretation
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of d_un.
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.Bd -literal -offset indent
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typedef struct {
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Elf32_Sword d_tag;
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union {
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Elf32_Word d_val;
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Elf32_Addr d_ptr;
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} d_un;
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Elf32_Sword d_tag;
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union {
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Elf32_Word d_val;
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Elf32_Addr d_ptr;
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} d_un;
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} Elf32_Dyn;
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extern Elf32_Dyn _DYNAMIC[];
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.Ed
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.Bd -literal -offset indent
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typedef struct {
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Elf64_Sxword d_tag;
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union {
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Elf64_Xword d_val;
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Elf64_Addr d_ptr;
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} d_un;
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Elf64_Sxword d_tag;
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union {
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Elf64_Xword d_val;
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Elf64_Addr d_ptr;
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} d_un;
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} Elf64_Dyn;
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extern Elf64_Dyn _DYNAMIC[];
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.Ed
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.Bl -tag -width "d_tag" -offset indent
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.Bl -tag -width "d_tag"
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.It Dv d_tag
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This member may have any of the following values:
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.Bl -tag -width "DT_SYMBOLIC"
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