mirror of https://github.com/mkerrisk/man-pages
Mike Frysinger <vapier@gentoo.org>
tweaked the short description to include definition of 'ELF' add ELFOSABI_NONE to the ELFOSABI_ list tweak/add more machines to EM_ list for ehdr->e_machine fix indenting to be consistent tweak the display of the ELF_ST_* macros document the Elf_Dyn structure
This commit is contained in:
Michael Kerrisk
parent
1077624456
commit
28d979c8c7
154
man5/elf.5
154
man5/elf.5
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@ -26,12 +26,14 @@
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.\" $FreeBSD: src/share/man/man5/elf.5,v 1.21 2001/10/01 16:09:23 ru Exp $
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.\"
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.\" Slightly adapted - aeb, 2004-01-01
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.\" 2005-07-15, Mike Frysinger <vapier@gentoo.org>, various fixes
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.\"
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.Dd July 31, 1999
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.Dt ELF 5
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.Os
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.Sh NAME
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.Nm elf
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.Nd format of ELF executable binary files
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.Nd format of Executable and Linking Format (ELF) files
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.Sh SYNOPSIS
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.\" .Fd #include <elf_abi.h>
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.Fd #include <elf.h>
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@ -206,6 +208,9 @@ the interpretation of those fields is determined by the value of this byte.
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E.g.:
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.Pp
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.Bl -tag -width "ELFOSABI_STANDALONE" -compact
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.It Dv ELFOSABI_NONE
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Same as ELFOSABI_SYSV
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.\" 0
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.It Dv ELFOSABI_SYSV
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UNIX System V ABI.
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.\" 0
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@ -328,7 +333,7 @@ MIPS RS3000 (big-endian only).
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.\" EM_MIPS_RS3_LE (MIPS R3000 little-endian)
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.\" 10
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.It Dv EM_PARISC
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HPPA.
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HP/PA.
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.\" 15
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.It Dv EM_SPARC32PLUS
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SPARC with enhanced instruction set.
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@ -336,18 +341,26 @@ SPARC with enhanced instruction set.
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.It Dv EM_PPC
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PowerPC.
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.\" 20
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.\" EM_PPC64
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.It Dv EM_PPC64
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PowerPC 64-bit.
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.\" 21
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.\" EM_S390
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.It Dv EM_S390
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IBM S/390
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.\" 22
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.\" EM_SH
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.It Dv EM_ARM
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Advanced RISC Machines
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.\" 40
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.It Dv EM_SH
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Renesas SuperH
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.\" 42
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.It Dv EM_SPARCV9
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SPARC v9 64-bit.
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.\" 43
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.\" EM_IA_64
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.It Dv EM_IA_64
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Intel Itanium
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.\" 50
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.\" EM_X86_64
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.It Dv EM_X86_64
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AMD x86-64
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.\" 62
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.It Dv EM_VAX
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DEC Vax.
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@ -714,7 +727,9 @@ typedef struct {
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uint64_t sh_entsize;
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} Elf64_Shdr;
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.Ed
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.Bl -tag -width "sh_addralign"
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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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.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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@ -889,7 +904,7 @@ 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"
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.Bl -tag -width ".shstrtab" -offset indent
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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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@ -1162,7 +1177,10 @@ typedef struct {
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uint64_t st_size;
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} Elf64_Sym;
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.Ed
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.Bl -tag -width "st_value"
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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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.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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@ -1235,27 +1253,24 @@ is reserved for processor-specific semantics.
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.Pp
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There are macros for packing and unpacking the binding and type fields:
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.Pp
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.Bl -tag -width "ELF32_ST_INFO(bind, type)" -compact
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.It Xo
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.Bl -tag -width "ELF_ST_INFO" -compact
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.Fn ELF32_ST_BIND info
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.Xc
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or
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.Fn ELF64_ST_BIND info
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extract a binding from an st_info value.
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.It Xo
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.Fn ELF64_ST_TYPE info
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.Xc
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or
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.Pp
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.Fn ELF32_ST_TYPE info
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or
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.Fn ELF64_ST_TYPE info
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.br
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extract a type from an st_info value.
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.It Xo
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.Pp
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.Fn ELF32_ST_INFO bind type
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.Xc
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or
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.Fn ELF64_ST_INFO bind type
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.br
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convert a binding and a type into an st_info value.
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.El
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.El
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.Pp
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.It Dv st_other
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This member currently holds zero and has no defined meaning.
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@ -1304,7 +1319,7 @@ typedef struct {
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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"
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.Bl -tag -width "r_offset" -offset indent
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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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@ -1330,6 +1345,103 @@ member.
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This member specifies a constant addend used to compute the value to be
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stored into the relocatable field.
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.El
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.Pp
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The .dynamic section contains a series of structures that hold relevant
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dynamic linking information. 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_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_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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.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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.It Dv DT_NULL
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Marks end of dynamic section
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.It Dv DT_NEEDED
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String table offset to name of a needed library
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.It Dv DT_PLTRELSZ
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Size in bytes of PLT relocs
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.It Dv DT_PLTGOT
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Address of PLT and/or GOT
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.It Dv DT_HASH
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Address of symbol hash table
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.It Dv DT_STRTAB
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Address of string table
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.It Dv DT_SYMTAB
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Address of symbol table
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.It Dv DT_RELA
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Address of Rela relocs table
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.It Dv DT_RELASZ
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Size in bytes of Rela table
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.It Dv DT_RELAENT
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Size in bytes of a Rela table entry
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.It Dv DT_STRSZ
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Size in bytes of string table
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.It Dv DT_SYMENT
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Size in bytes of a symbol table entry
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.It Dv DT_INIT
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Address of the initialization function
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.It Dv DT_FINI
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Address of the termination function
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.It Dv DT_SONAME
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String table offset to name of shared object
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.It Dv DT_RPATH
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String table offset to library search path (deprecated)
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.It Dv DT_SYMBOLIC
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Alert linker to search this shared object before the executable for symbols
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.It Dv DT_REL
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Address of Rel relocs table
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.It Dv DT_RELSZ
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Size in bytes of Rel table
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.It Dv DT_RELENT
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Size in bytes of a Rel table entry
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.It Dv DT_PLTREL
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Type of reloc the PLT refers (Rela or Rel)
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.It Dv DT_DEBUG
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Undefined use for debugging
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.It Dv DT_TEXTREL
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Absence of this indicates no relocs should apply to a non-writable segment
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.It Dv DT_JMPREL
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Address of reloc entries solely for the PLT
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.It Dv DT_BIND_NOW
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Instruct dynamic linker to process all relocs before transferring control to
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the executable
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.It Dv DT_RUNPATH
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String table offset to library search path
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.It Dv DT_LOPROC
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Start of processor-specific semantics
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.It Dv DT_HIPROC
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End of processor-specific semantics
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.El
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.It Dv d_val
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This member represents integer values with various interpretations.
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.It Dv d_ptr
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This member represents program virtual addresses. When interpreting
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these addresses, the actual address should be computed based on the
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original file value and memory base address. Files do not contain
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relocation entries to fixup these addresses.
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.It Dv _DYNAMIC
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Array containing all the dynamic structures in the .dynamic section.
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This is automatically populated by the linker.
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.El
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.Sh SEE ALSO
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.Xr as 1 ,
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.Xr gdb 1 ,
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