ld

package
v0.0.0-...-4df6dd4 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Sep 4, 2018 License: BSD-3-Clause Imports: 42 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	SARMAG  = 8
	SAR_HDR = 16 + 44
)
View Source 
const (
	MaxKeySize = 128
	MaxValSize = 128
	BucketSize = 8
)

synthesizemaptypes is way too closely married to runtime/hashmap.c

View Source 
const (
	LINE_BASE   = -4
	LINE_RANGE  = 10
	PC_RANGE    = (255 - OPCODE_BASE) / LINE_RANGE
	OPCODE_BASE = 11
)

* Generate a sequence of opcodes that is as short as possible. * See section 6.2.5

View Source 
const (
	EI_MAG0              = 0
	EI_MAG1              = 1
	EI_MAG2              = 2
	EI_MAG3              = 3
	EI_CLASS             = 4
	EI_DATA              = 5
	EI_VERSION           = 6
	EI_OSABI             = 7
	EI_ABIVERSION        = 8
	OLD_EI_BRAND         = 8
	EI_PAD               = 9
	EI_NIDENT            = 16
	ELFMAG0              = 0x7f
	ELFMAG1              = 'E'
	ELFMAG2              = 'L'
	ELFMAG3              = 'F'
	SELFMAG              = 4
	EV_NONE              = 0
	EV_CURRENT           = 1
	ELFCLASSNONE         = 0
	ELFCLASS32           = 1
	ELFCLASS64           = 2
	ELFDATANONE          = 0
	ELFDATA2LSB          = 1
	ELFDATA2MSB          = 2
	ELFOSABI_NONE        = 0
	ELFOSABI_HPUX        = 1
	ELFOSABI_NETBSD      = 2
	ELFOSABI_LINUX       = 3
	ELFOSABI_HURD        = 4
	ELFOSABI_86OPEN      = 5
	ELFOSABI_SOLARIS     = 6
	ELFOSABI_AIX         = 7
	ELFOSABI_IRIX        = 8
	ELFOSABI_FREEBSD     = 9
	ELFOSABI_TRU64       = 10
	ELFOSABI_MODESTO     = 11
	ELFOSABI_OPENBSD     = 12
	ELFOSABI_OPENVMS     = 13
	ELFOSABI_NSK         = 14
	ELFOSABI_ARM         = 97
	ELFOSABI_STANDALONE  = 255
	ELFOSABI_SYSV        = ELFOSABI_NONE
	ELFOSABI_MONTEREY    = ELFOSABI_AIX
	ET_NONE              = 0
	ET_REL               = 1
	ET_EXEC              = 2
	ET_DYN               = 3
	ET_CORE              = 4
	ET_LOOS              = 0xfe00
	ET_HIOS              = 0xfeff
	ET_LOPROC            = 0xff00
	ET_HIPROC            = 0xffff
	EM_NONE              = 0
	EM_M32               = 1
	EM_SPARC             = 2
	EM_386               = 3
	EM_68K               = 4
	EM_88K               = 5
	EM_860               = 7
	EM_MIPS              = 8
	EM_S370              = 9
	EM_MIPS_RS3_LE       = 10
	EM_PARISC            = 15
	EM_VPP500            = 17
	EM_SPARC32PLUS       = 18
	EM_960               = 19
	EM_PPC               = 20
	EM_PPC64             = 21
	EM_S390              = 22
	EM_V800              = 36
	EM_FR20              = 37
	EM_RH32              = 38
	EM_RCE               = 39
	EM_ARM               = 40
	EM_SH                = 42
	EM_SPARCV9           = 43
	EM_TRICORE           = 44
	EM_ARC               = 45
	EM_H8_300            = 46
	EM_H8_300H           = 47
	EM_H8S               = 48
	EM_H8_500            = 49
	EM_IA_64             = 50
	EM_MIPS_X            = 51
	EM_COLDFIRE          = 52
	EM_68HC12            = 53
	EM_MMA               = 54
	EM_PCP               = 55
	EM_NCPU              = 56
	EM_NDR1              = 57
	EM_STARCORE          = 58
	EM_ME16              = 59
	EM_ST100             = 60
	EM_TINYJ             = 61
	EM_X86_64            = 62
	EM_AARCH64           = 183
	EM_486               = 6
	EM_MIPS_RS4_BE       = 10
	EM_ALPHA_STD         = 41
	EM_ALPHA             = 0x9026
	SHN_UNDEF            = 0
	SHN_LORESERVE        = 0xff00
	SHN_LOPROC           = 0xff00
	SHN_HIPROC           = 0xff1f
	SHN_LOOS             = 0xff20
	SHN_HIOS             = 0xff3f
	SHN_ABS              = 0xfff1
	SHN_COMMON           = 0xfff2
	SHN_XINDEX           = 0xffff
	SHN_HIRESERVE        = 0xffff
	SHT_NULL             = 0
	SHT_PROGBITS         = 1
	SHT_SYMTAB           = 2
	SHT_STRTAB           = 3
	SHT_RELA             = 4
	SHT_HASH             = 5
	SHT_DYNAMIC          = 6
	SHT_NOTE             = 7
	SHT_NOBITS           = 8
	SHT_REL              = 9
	SHT_SHLIB            = 10
	SHT_DYNSYM           = 11
	SHT_INIT_ARRAY       = 14
	SHT_FINI_ARRAY       = 15
	SHT_PREINIT_ARRAY    = 16
	SHT_GROUP            = 17
	SHT_SYMTAB_SHNDX     = 18
	SHT_LOOS             = 0x60000000
	SHT_HIOS             = 0x6fffffff
	SHT_GNU_VERDEF       = 0x6ffffffd
	SHT_GNU_VERNEED      = 0x6ffffffe
	SHT_GNU_VERSYM       = 0x6fffffff
	SHT_LOPROC           = 0x70000000
	SHT_ARM_ATTRIBUTES   = 0x70000003
	SHT_HIPROC           = 0x7fffffff
	SHT_LOUSER           = 0x80000000
	SHT_HIUSER           = 0xffffffff
	SHF_WRITE            = 0x1
	SHF_ALLOC            = 0x2
	SHF_EXECINSTR        = 0x4
	SHF_MERGE            = 0x10
	SHF_STRINGS          = 0x20
	SHF_INFO_LINK        = 0x40
	SHF_LINK_ORDER       = 0x80
	SHF_OS_NONCONFORMING = 0x100
	SHF_GROUP            = 0x200
	SHF_TLS              = 0x400
	SHF_MASKOS           = 0x0ff00000
	SHF_MASKPROC         = 0xf0000000
	PT_NULL              = 0
	PT_LOAD              = 1
	PT_DYNAMIC           = 2
	PT_INTERP            = 3
	PT_NOTE              = 4
	PT_SHLIB             = 5
	PT_PHDR              = 6
	PT_TLS               = 7
	PT_LOOS              = 0x60000000
	PT_HIOS              = 0x6fffffff
	PT_LOPROC            = 0x70000000
	PT_HIPROC            = 0x7fffffff
	PT_GNU_STACK         = 0x6474e551
	PT_GNU_RELRO         = 0x6474e552
	PT_PAX_FLAGS         = 0x65041580
	PT_SUNWSTACK         = 0x6ffffffb
	PF_X                 = 0x1
	PF_W                 = 0x2
	PF_R                 = 0x4
	PF_MASKOS            = 0x0ff00000
	PF_MASKPROC          = 0xf0000000
	DT_NULL              = 0
	DT_NEEDED            = 1
	DT_PLTRELSZ          = 2
	DT_PLTGOT            = 3
	DT_HASH              = 4
	DT_STRTAB            = 5
	DT_SYMTAB            = 6
	DT_RELA              = 7
	DT_RELASZ            = 8
	DT_RELAENT           = 9
	DT_STRSZ             = 10
	DT_SYMENT            = 11
	DT_INIT              = 12
	DT_FINI              = 13
	DT_SONAME            = 14
	DT_RPATH             = 15
	DT_SYMBOLIC          = 16
	DT_REL               = 17
	DT_RELSZ             = 18
	DT_RELENT            = 19
	DT_PLTREL            = 20
	DT_DEBUG             = 21
	DT_TEXTREL           = 22
	DT_JMPREL            = 23
	DT_BIND_NOW          = 24
	DT_INIT_ARRAY        = 25
	DT_FINI_ARRAY        = 26
	DT_INIT_ARRAYSZ      = 27
	DT_FINI_ARRAYSZ      = 28
	DT_RUNPATH           = 29
	DT_FLAGS             = 30
	DT_ENCODING          = 32
	DT_PREINIT_ARRAY     = 32
	DT_PREINIT_ARRAYSZ   = 33
	DT_LOOS              = 0x6000000d
	DT_HIOS              = 0x6ffff000
	DT_LOPROC            = 0x70000000
	DT_HIPROC            = 0x7fffffff
	DT_VERNEED           = 0x6ffffffe
	DT_VERNEEDNUM        = 0x6fffffff
	DT_VERSYM            = 0x6ffffff0
	DT_PPC64_GLINK       = DT_LOPROC + 0
	DT_PPC64_OPT         = DT_LOPROC + 3
	DF_ORIGIN            = 0x0001
	DF_SYMBOLIC          = 0x0002
	DF_TEXTREL           = 0x0004
	DF_BIND_NOW          = 0x0008
	DF_STATIC_TLS        = 0x0010
	NT_PRSTATUS          = 1
	NT_FPREGSET          = 2
	NT_PRPSINFO          = 3
	STB_LOCAL            = 0
	STB_GLOBAL           = 1
	STB_WEAK             = 2
	STB_LOOS             = 10
	STB_HIOS             = 12
	STB_LOPROC           = 13
	STB_HIPROC           = 15
	STT_NOTYPE           = 0
	STT_OBJECT           = 1
	STT_FUNC             = 2
	STT_SECTION          = 3
	STT_FILE             = 4
	STT_COMMON           = 5
	STT_TLS              = 6
	STT_LOOS             = 10
	STT_HIOS             = 12
	STT_LOPROC           = 13
	STT_HIPROC           = 15
	STV_DEFAULT          = 0x0
	STV_INTERNAL         = 0x1
	STV_HIDDEN           = 0x2
	STV_PROTECTED        = 0x3
	STN_UNDEF            = 0
)
View Source 
const (
	ELF64HDRSIZE  = 64
	ELF64PHDRSIZE = 56
	ELF64SHDRSIZE = 64
	ELF64RELSIZE  = 16
	ELF64RELASIZE = 24
	ELF64SYMSIZE  = 24
	ELF32HDRSIZE  = 52
	ELF32PHDRSIZE = 32
	ELF32SHDRSIZE = 40
	ELF32SYMSIZE  = 16
	ELF32RELSIZE  = 8
)

* Go linker interface

View Source 
const (
	ELF_NOTE_NETBSD_NAMESZ  = 7
	ELF_NOTE_NETBSD_DESCSZ  = 4
	ELF_NOTE_NETBSD_TAG     = 1
	ELF_NOTE_NETBSD_VERSION = 599000000 /* NetBSD 5.99 */
)

NetBSD Signature (as per sys/exec_elf.h)

View Source 
const (
	ELF_NOTE_OPENBSD_NAMESZ  = 8
	ELF_NOTE_OPENBSD_DESCSZ  = 4
	ELF_NOTE_OPENBSD_TAG     = 1
	ELF_NOTE_OPENBSD_VERSION = 0
)

OpenBSD Signature

View Source 
const (
	ELF_NOTE_BUILDINFO_NAMESZ = 4
	ELF_NOTE_BUILDINFO_TAG    = 3
)

Build info note

View Source 
const (
	ELF_NOTE_GOPKGLIST_TAG = 1
	ELF_NOTE_GOABIHASH_TAG = 2
	ELF_NOTE_GODEPS_TAG    = 3
	ELF_NOTE_GOBUILDID_TAG = 4
)

Go specific notes

View Source 
const (
	MACHO_CPU_AMD64               = 1<<24 | 7
	MACHO_CPU_386                 = 7
	MACHO_SUBCPU_X86              = 3
	MACHO_CPU_ARM                 = 12
	MACHO_SUBCPU_ARM              = 0
	MACHO_SUBCPU_ARMV7            = 9
	MACHO_CPU_ARM64               = 1<<24 | 12
	MACHO_SUBCPU_ARM64_ALL        = 0
	MACHO32SYMSIZE                = 12
	MACHO64SYMSIZE                = 16
	MACHO_X86_64_RELOC_UNSIGNED   = 0
	MACHO_X86_64_RELOC_SIGNED     = 1
	MACHO_X86_64_RELOC_BRANCH     = 2
	MACHO_X86_64_RELOC_GOT_LOAD   = 3
	MACHO_X86_64_RELOC_GOT        = 4
	MACHO_X86_64_RELOC_SUBTRACTOR = 5
	MACHO_X86_64_RELOC_SIGNED_1   = 6
	MACHO_X86_64_RELOC_SIGNED_2   = 7
	MACHO_X86_64_RELOC_SIGNED_4   = 8
	MACHO_ARM_RELOC_VANILLA       = 0
	MACHO_ARM_RELOC_PAIR          = 1
	MACHO_ARM_RELOC_SECTDIFF      = 2
	MACHO_ARM_RELOC_BR24          = 5
	MACHO_ARM64_RELOC_UNSIGNED    = 0
	MACHO_ARM64_RELOC_BRANCH26    = 2
	MACHO_ARM64_RELOC_PAGE21      = 3
	MACHO_ARM64_RELOC_PAGEOFF12   = 4
	MACHO_ARM64_RELOC_ADDEND      = 10
	MACHO_GENERIC_RELOC_VANILLA   = 0
	MACHO_FAKE_GOTPCREL           = 100
)
View Source 
const (
	MH_MAGIC    = 0xfeedface
	MH_MAGIC_64 = 0xfeedfacf

	MH_OBJECT  = 0x1
	MH_EXECUTE = 0x2

	MH_NOUNDEFS = 0x1
)
View Source 
const (
	LC_SEGMENT                  = 0x1
	LC_SYMTAB                   = 0x2
	LC_SYMSEG                   = 0x3
	LC_THREAD                   = 0x4
	LC_UNIXTHREAD               = 0x5
	LC_LOADFVMLIB               = 0x6
	LC_IDFVMLIB                 = 0x7
	LC_IDENT                    = 0x8
	LC_FVMFILE                  = 0x9
	LC_PREPAGE                  = 0xa
	LC_DYSYMTAB                 = 0xb
	LC_LOAD_DYLIB               = 0xc
	LC_ID_DYLIB                 = 0xd
	LC_LOAD_DYLINKER            = 0xe
	LC_ID_DYLINKER              = 0xf
	LC_PREBOUND_DYLIB           = 0x10
	LC_ROUTINES                 = 0x11
	LC_SUB_FRAMEWORK            = 0x12
	LC_SUB_UMBRELLA             = 0x13
	LC_SUB_CLIENT               = 0x14
	LC_SUB_LIBRARY              = 0x15
	LC_TWOLEVEL_HINTS           = 0x16
	LC_PREBIND_CKSUM            = 0x17
	LC_LOAD_WEAK_DYLIB          = 0x18
	LC_SEGMENT_64               = 0x19
	LC_ROUTINES_64              = 0x1a
	LC_UUID                     = 0x1b
	LC_RPATH                    = 0x8000001c
	LC_CODE_SIGNATURE           = 0x1d
	LC_SEGMENT_SPLIT_INFO       = 0x1e
	LC_REEXPORT_DYLIB           = 0x8000001f
	LC_LAZY_LOAD_DYLIB          = 0x20
	LC_ENCRYPTION_INFO          = 0x21
	LC_DYLD_INFO                = 0x22
	LC_DYLD_INFO_ONLY           = 0x80000022
	LC_LOAD_UPWARD_DYLIB        = 0x80000023
	LC_VERSION_MIN_MACOSX       = 0x24
	LC_VERSION_MIN_IPHONEOS     = 0x25
	LC_FUNCTION_STARTS          = 0x26
	LC_DYLD_ENVIRONMENT         = 0x27
	LC_MAIN                     = 0x80000028
	LC_DATA_IN_CODE             = 0x29
	LC_SOURCE_VERSION           = 0x2A
	LC_DYLIB_CODE_SIGN_DRS      = 0x2B
	LC_ENCRYPTION_INFO_64       = 0x2C
	LC_LINKER_OPTION            = 0x2D
	LC_LINKER_OPTIMIZATION_HINT = 0x2E
	LC_VERSION_MIN_TVOS         = 0x2F
	LC_VERSION_MIN_WATCHOS      = 0x30
	LC_VERSION_NOTE             = 0x31
	LC_BUILD_VERSION            = 0x32
)
View Source 
const (
	S_REGULAR                  = 0x0
	S_ZEROFILL                 = 0x1
	S_NON_LAZY_SYMBOL_POINTERS = 0x6
	S_SYMBOL_STUBS             = 0x8
	S_MOD_INIT_FUNC_POINTERS   = 0x9
	S_ATTR_PURE_INSTRUCTIONS   = 0x80000000
	S_ATTR_DEBUG               = 0x02000000
	S_ATTR_SOME_INSTRUCTIONS   = 0x00000400
)
View Source 
const (
	SymKindLocal = 0 + iota
	SymKindExtdef
	SymKindUndef
	NumSymKind
)
View Source 
const (
	BUCKETSIZE    = 256 * MINFUNC
	SUBBUCKETS    = 16
	SUBBUCKETSIZE = BUCKETSIZE / SUBBUCKETS
	NOIDX         = 0x7fffffff
)
View Source 
const (
	IMAGE_FILE_MACHINE_I386               = 0x14c
	IMAGE_FILE_MACHINE_AMD64              = 0x8664
	IMAGE_FILE_MACHINE_ARM                = 0x1c0
	IMAGE_FILE_MACHINE_ARMNT              = 0x1c4
	IMAGE_FILE_RELOCS_STRIPPED            = 0x0001
	IMAGE_FILE_EXECUTABLE_IMAGE           = 0x0002
	IMAGE_FILE_LINE_NUMS_STRIPPED         = 0x0004
	IMAGE_FILE_LARGE_ADDRESS_AWARE        = 0x0020
	IMAGE_FILE_32BIT_MACHINE              = 0x0100
	IMAGE_FILE_DEBUG_STRIPPED             = 0x0200
	IMAGE_SCN_CNT_CODE                    = 0x00000020
	IMAGE_SCN_CNT_INITIALIZED_DATA        = 0x00000040
	IMAGE_SCN_CNT_UNINITIALIZED_DATA      = 0x00000080
	IMAGE_SCN_MEM_EXECUTE                 = 0x20000000
	IMAGE_SCN_MEM_READ                    = 0x40000000
	IMAGE_SCN_MEM_WRITE                   = 0x80000000
	IMAGE_SCN_MEM_DISCARDABLE             = 0x2000000
	IMAGE_SCN_LNK_NRELOC_OVFL             = 0x1000000
	IMAGE_SCN_ALIGN_32BYTES               = 0x600000
	IMAGE_DIRECTORY_ENTRY_EXPORT          = 0
	IMAGE_DIRECTORY_ENTRY_IMPORT          = 1
	IMAGE_DIRECTORY_ENTRY_RESOURCE        = 2
	IMAGE_DIRECTORY_ENTRY_EXCEPTION       = 3
	IMAGE_DIRECTORY_ENTRY_SECURITY        = 4
	IMAGE_DIRECTORY_ENTRY_BASERELOC       = 5
	IMAGE_DIRECTORY_ENTRY_DEBUG           = 6
	IMAGE_DIRECTORY_ENTRY_COPYRIGHT       = 7
	IMAGE_DIRECTORY_ENTRY_ARCHITECTURE    = 7
	IMAGE_DIRECTORY_ENTRY_GLOBALPTR       = 8
	IMAGE_DIRECTORY_ENTRY_TLS             = 9
	IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG     = 10
	IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT    = 11
	IMAGE_DIRECTORY_ENTRY_IAT             = 12
	IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT    = 13
	IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR  = 14
	IMAGE_SUBSYSTEM_WINDOWS_GUI           = 2
	IMAGE_SUBSYSTEM_WINDOWS_CUI           = 3
	IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE = 0x0040
	IMAGE_DLLCHARACTERISTICS_NX_COMPAT    = 0x0100
)
View Source 
const (
	// TODO: the Microsoft doco says IMAGE_SYM_DTYPE_ARRAY is 3 and IMAGE_SYM_DTYPE_FUNCTION is 2
	IMAGE_SYM_TYPE_NULL      = 0
	IMAGE_SYM_TYPE_STRUCT    = 8
	IMAGE_SYM_DTYPE_FUNCTION = 0x20
	IMAGE_SYM_DTYPE_ARRAY    = 0x30
	IMAGE_SYM_CLASS_EXTERNAL = 2
	IMAGE_SYM_CLASS_STATIC   = 3

	IMAGE_REL_I386_DIR32  = 0x0006
	IMAGE_REL_I386_SECREL = 0x000B
	IMAGE_REL_I386_REL32  = 0x0014

	IMAGE_REL_AMD64_ADDR64 = 0x0001
	IMAGE_REL_AMD64_ADDR32 = 0x0002
	IMAGE_REL_AMD64_REL32  = 0x0004
	IMAGE_REL_AMD64_SECREL = 0x000B

	IMAGE_REL_ARM_ABSOLUTE = 0x0000
	IMAGE_REL_ARM_ADDR32   = 0x0001
	IMAGE_REL_ARM_ADDR32NB = 0x0002
	IMAGE_REL_ARM_BRANCH24 = 0x0003
	IMAGE_REL_ARM_BRANCH11 = 0x0004
	IMAGE_REL_ARM_SECREL   = 0x000F

	IMAGE_REL_BASED_HIGHLOW = 3
)

TODO(crawshaw): add these constants to debug/pe.

View Source 
const (
	ARMAG = "!<arch>\n"
)
View Source 
const (
	ARM_MAGIC_TRAMP_NUMBER = 0x5c000003
)

* Relocation types.

View Source 
const (
	COMPUNITHEADERSIZE = 4 + 2 + 4 + 1
)

* Walk DWarfDebugInfoEntries, and emit .debug_info

View Source 
const (
	ELFRESERVE = 4096
)

* Total amount of space to reserve at the start of the file * for Header, PHeaders, SHeaders, and interp. * May waste some. * On FreeBSD, cannot be larger than a page.

View Source 
const (
	INITIAL_MACHO_HEADR = 4 * 1024
)

* Total amount of space to reserve at the start of the file * for Header, PHeaders, and SHeaders. * May waste some.

View Source 
const (
	MINFUNC = 16 // minimum size for a function
)
View Source 
const (
	NSECT = 400
)

* We use the 64-bit data structures on both 32- and 64-bit machines * in order to write the code just once. The 64-bit data structure is * written in the 32-bit format on the 32-bit machines.

View Source 
const (
	PEBASE = 0x00400000
)

Variables

View Source 
var (
	Lcsize int32

	Spsize  int32
	Symsize int32
)
View Source 
var (
	Funcalign int

	HEADR int32
)
View Source 
var (
	Segtext      sym.Segment
	Segrodata    sym.Segment
	Segrelrodata sym.Segment
	Segdata      sym.Segment
	Segdwarf     sym.Segment
)
View Source 
var (
	FlagC = flag.Bool("c", false, "dump call graph")
	FlagD = flag.Bool("d", false, "disable dynamic executable")

	FlagS = flag.Bool("s", false, "disable symbol table")

	FlagW = flag.Bool("w", false, "disable DWARF generation")
	Flag8 bool // use 64-bit addresses in symbol table

	FlagDebugTramp = flag.Int("debugtramp", 0, "debug trampolines")

	FlagRound    = flag.Int("R", -1, "set address rounding `quantum`")
	FlagTextAddr = flag.Int64("T", -1, "set text segment `address`")
	FlagDataAddr = flag.Int64("D", -1, "set data segment `address`")
)

Flags used by the linker. The exported flags are used by the architecture-specific packages.

View Source 
var (
	// SectionAlignment must be greater than or equal to FileAlignment.
	// The default is the page size for the architecture.
	PESECTALIGN int64 = 0x1000

	// FileAlignment should be a power of 2 between 512 and 64 K, inclusive.
	// The default is 512. If the SectionAlignment is less than
	// the architecture's page size, then FileAlignment must match SectionAlignment.
	PEFILEALIGN int64 = 2 << 8
)
View Source 
var (
	PESECTHEADR int32
	PEFILEHEADR int32
)
View Source 
var ELF_NOTE_BUILDINFO_NAME = []byte("GNU\x00")
View Source 
var ELF_NOTE_GO_NAME = []byte("Go\x00\x00")
View Source 
var ELF_NOTE_NETBSD_NAME = []byte("NetBSD\x00")
View Source 
var ELF_NOTE_OPENBSD_NAME = []byte("OpenBSD\x00")
View Source 
var Elfstrdat []byte
View Source 
var (
	Nelfsym = 1
)

Functions

func Adddynsym 

func Adddynsym(ctxt *Link, s *sym.Symbol)

func Addstring 

func Addstring(s *sym.Symbol, str string) int64

func Asmbelf 

func Asmbelf(ctxt *Link, symo int64)

func Asmbelfsetup 

func Asmbelfsetup()

func Asmbmacho 

func Asmbmacho(ctxt *Link)

func Asmbpe 

func Asmbpe(ctxt *Link)

func Asmelfsym 

func Asmelfsym(ctxt *Link)

func Asmplan9sym 

func Asmplan9sym(ctxt *Link)

func AtExit 

func AtExit(f func())

func Be16 

func Be16(b []byte) uint16

func Be32 

func Be32(b []byte) uint32

func Codeblk 

func Codeblk(ctxt *Link, addr int64, size int64)

func CodeblkPad 

func CodeblkPad(ctxt *Link, addr int64, size int64, pad []byte)

func Cputime 

func Cputime() float64

TODO(josharian): delete. See issue 19865.

func Datblk 

func Datblk(ctxt *Link, addr int64, size int64)
func Domacholink(ctxt *Link) int64

func Dwarfblk 

func Dwarfblk(ctxt *Link, addr int64, size int64)

func ELF32_R_INFO 

func ELF32_R_INFO(sym uint32, type_ uint32) uint32

func ELF32_R_SYM 

func ELF32_R_SYM(info uint32) uint32

func ELF32_R_TYPE 

func ELF32_R_TYPE(info uint32) uint32

func ELF32_ST_BIND 

func ELF32_ST_BIND(info uint8) uint8

func ELF32_ST_INFO 

func ELF32_ST_INFO(bind uint8, type_ uint8) uint8

func ELF32_ST_TYPE 

func ELF32_ST_TYPE(info uint8) uint8

func ELF32_ST_VISIBILITY 

func ELF32_ST_VISIBILITY(oth uint8) uint8

func ELF64_R_INFO 

func ELF64_R_INFO(sym uint32, type_ uint32) uint64

func ELF64_R_SYM 

func ELF64_R_SYM(info uint64) uint32

func ELF64_R_TYPE 

func ELF64_R_TYPE(info uint64) uint32

func ELF64_ST_BIND 

func ELF64_ST_BIND(info uint8) uint8

func ELF64_ST_INFO 

func ELF64_ST_INFO(bind uint8, type_ uint8) uint8

func ELF64_ST_TYPE 

func ELF64_ST_TYPE(info uint8) uint8

func ELF64_ST_VISIBILITY 

func ELF64_ST_VISIBILITY(oth uint8) uint8

func Elfemitreloc 

func Elfemitreloc(ctxt *Link)

func Elfinit 

func Elfinit(ctxt *Link)

Initialize the global variable that describes the ELF header. It will be updated as we write section and prog headers.

func Elfwritedynent 

func Elfwritedynent(ctxt *Link, s *sym.Symbol, tag int, val uint64)

func Elfwritedynentsymplus 

func Elfwritedynentsymplus(ctxt *Link, s *sym.Symbol, tag int, t *sym.Symbol, add int64)

func Entryvalue 

func Entryvalue(ctxt *Link) int64

func Errorf 

func Errorf(s *sym.Symbol, format string, args ...interface{})

Errorf logs an error message.

If more than 20 errors have been printed, exit with an error.

Logging an error means that on exit cmd/link will delete any output file and return a non-zero error code.

func Exit 

func Exit(code int)

Exit exits with code after executing all atExitFuncs.

func Exitf 

func Exitf(format string, a ...interface{})

Exitf logs an error message then calls Exit(2).

func Le16 

func Le16(b []byte) uint16

func Le32 

func Le32(b []byte) uint32

func Le64 

func Le64(b []byte) uint64

func Lflag 

func Lflag(ctxt *Link, arg string)

func Machoemitreloc 

func Machoemitreloc(ctxt *Link)

func Main 

func Main(arch *sys.Arch, theArch Arch)

Main is the main entry point for the linker code.

func Peinit 

func Peinit(ctxt *Link)

func Rnd 

func Rnd(v int64, r int64) int64

func Symaddr 

func Symaddr(s *sym.Symbol) int64

Types

type ArHdr 

type ArHdr struct {
	// contains filtered or unexported fields
}

type Arch 

type Arch struct {
	Funcalign      int
	Maxalign       int
	Minalign       int
	Dwarfregsp     int
	Dwarfreglr     int
	Linuxdynld     string
	Freebsddynld   string
	Netbsddynld    string
	Openbsddynld   string
	Dragonflydynld string
	Solarisdynld   string
	Adddynrel      func(*Link, *sym.Symbol, *sym.Reloc) bool
	Archinit       func(*Link)
	// Archreloc is an arch-specific hook that assists in
	// relocation processing (invoked by 'relocsym'); it handles
	// target-specific relocation tasks. Here "rel" is the current
	// relocation being examined, "sym" is the symbol containing the
	// chunk of data to which the relocation applies, and "off" is the
	// contents of the to-be-relocated data item (from sym.P). Return
	// value is the appropriately relocated value (to be written back
	// to the same spot in sym.P) and a boolean indicating
	// success/failure (a failing value indicates a fatal error).
	Archreloc func(link *Link, rel *sym.Reloc, sym *sym.Symbol,
		offset int64) (relocatedOffset int64, success bool)
	// Archrelocvariant is a second arch-specific hook used for
	// relocation processing; it handles relocations where r.Type is
	// insufficient to describe the relocation (r.Variant !=
	// sym.RV_NONE). Here "rel" is the relocation being applied, "sym"
	// is the symbol containing the chunk of data to which the
	// relocation applies, and "off" is the contents of the
	// to-be-relocated data item (from sym.P). Return is an updated
	// offset value.
	Archrelocvariant func(link *Link, rel *sym.Reloc, sym *sym.Symbol,
		offset int64) (relocatedOffset int64)
	Trampoline  func(*Link, *sym.Reloc, *sym.Symbol)
	Asmb        func(*Link)
	Elfreloc1   func(*Link, *sym.Reloc, int64) bool
	Elfsetupplt func(*Link)
	Gentext     func(*Link)
	Machoreloc1 func(*sys.Arch, *OutBuf, *sym.Symbol, *sym.Reloc, int64) bool
	PEreloc1    func(*sys.Arch, *OutBuf, *sym.Symbol, *sym.Reloc, int64) bool

	// TLSIEtoLE converts a TLS Initial Executable relocation to
	// a TLS Local Executable relocation.
	//
	// This is possible when a TLS IE relocation refers to a local
	// symbol in an executable, which is typical when internally
	// linking PIE binaries.
	TLSIEtoLE func(s *sym.Symbol, off, size int)

	// optional override for assignAddress
	AssignAddress func(ctxt *Link, sect *sym.Section, n int, s *sym.Symbol, va uint64, isTramp bool) (*sym.Section, int, uint64)
}

type BuildMode 

type BuildMode uint8

A BuildMode indicates the sort of object we are building.

Possible build modes are the same as those for the -buildmode flag in cmd/go, and are documented in 'go help buildmode'. 

const (
	BuildModeUnset BuildMode = iota
	BuildModeExe
	BuildModePIE
	BuildModeCArchive
	BuildModeCShared
	BuildModeShared
	BuildModePlugin
)

func (*BuildMode) Set 

func (mode *BuildMode) Set(s string) error

func (*BuildMode) String 

func (mode *BuildMode) String() string

type Dll 

type Dll struct {
	// contains filtered or unexported fields
}

type ElfEhdr 

type ElfEhdr struct {
	// contains filtered or unexported fields
}

* ELF header.

type ElfPhdr 

type ElfPhdr struct {
	// contains filtered or unexported fields
}

* Program header.

type ElfShdr 

type ElfShdr struct {
	// contains filtered or unexported fields
}

* Section header.

type Elfaux 

type Elfaux struct {
	// contains filtered or unexported fields
}

type Elflib 

type Elflib struct {
	// contains filtered or unexported fields
}

type Elfstring 

type Elfstring struct {
	// contains filtered or unexported fields
}

type GCProg 

type GCProg struct {
	// contains filtered or unexported fields
}

func (*GCProg) AddSym 

func (p *GCProg) AddSym(s *sym.Symbol)

func (*GCProg) End 

func (p *GCProg) End(size int64)

func (*GCProg) Init 

func (p *GCProg) Init(ctxt *Link, name string)

type Hostobj 

type Hostobj struct {
	// contains filtered or unexported fields
}

type IMAGE_EXPORT_DIRECTORY 

type IMAGE_EXPORT_DIRECTORY struct {
	Characteristics       uint32
	TimeDateStamp         uint32
	MajorVersion          uint16
	MinorVersion          uint16
	Name                  uint32
	Base                  uint32
	NumberOfFunctions     uint32
	NumberOfNames         uint32
	AddressOfFunctions    uint32
	AddressOfNames        uint32
	AddressOfNameOrdinals uint32
}

type IMAGE_IMPORT_DESCRIPTOR 

type IMAGE_IMPORT_DESCRIPTOR struct {
	OriginalFirstThunk uint32
	TimeDateStamp      uint32
	ForwarderChain     uint32
	Name               uint32
	FirstThunk         uint32
}

type Imp 

type Imp struct {
	// contains filtered or unexported fields
}
type Link struct {
	Out *OutBuf

	Syms *sym.Symbols

	Arch      *sys.Arch
	Debugvlog int
	Bso       *bufio.Writer

	Loaded bool // set after all inputs have been loaded as symbols

	IsELF    bool
	HeadType objabi.HeadType

	LinkMode  LinkMode
	BuildMode BuildMode

	Tlsg         *sym.Symbol
	Libdir       []string
	Library      []*sym.Library
	LibraryByPkg map[string]*sym.Library
	Shlibs       []Shlib
	Tlsoffset    int
	Textp        []*sym.Symbol
	Filesyms     []*sym.Symbol
	Moduledata   *sym.Symbol

	PackageFile  map[string]string
	PackageShlib map[string]string

	// Used to implement field tracking.
	Reachparent map[*sym.Symbol]*sym.Symbol
	// contains filtered or unexported fields
}

Link holds the context for writing object code from a compiler or for reading that input into the linker.

func (*Link) AddTramp 

func (ctxt *Link) AddTramp(s *sym.Symbol)

add a trampoline with symbol s (to be laid down after the current function)

func (*Link) CanUsePlugins 

func (ctxt *Link) CanUsePlugins() bool

CanUsePlugins returns whether a plugins can be used

func (*Link) DynlinkingGo 

func (ctxt *Link) DynlinkingGo() bool

DynlinkingGo returns whether we are producing Go code that can live in separate shared libraries linked together at runtime.

func (*Link) ErrorUnresolved 

func (ctxt *Link) ErrorUnresolved(s *sym.Symbol, r *sym.Reloc)

ErrorUnresolved prints unresolved symbol error for r.Sym that is referenced from s.

func (*Link) FixedFrameSize 

func (ctxt *Link) FixedFrameSize() int64

The smallest possible offset from the hardware stack pointer to a local variable on the stack. Architectures that use a link register save its value on the stack in the function prologue and so always have a pointer between the hardware stack pointer and the local variable area.

func (*Link) Logf 

func (ctxt *Link) Logf(format string, args ...interface{})

func (*Link) UseRelro 

func (ctxt *Link) UseRelro() bool

UseRelro returns whether to make use of "read only relocations" aka relro.

type LinkMode 

type LinkMode uint8

LinkMode indicates whether an external linker is used for the final link. 

const (
	LinkAuto LinkMode = iota
	LinkInternal
	LinkExternal
)

func (*LinkMode) Set 

func (mode *LinkMode) Set(s string) error

func (*LinkMode) String 

func (mode *LinkMode) String() string

type MachoHdr 

type MachoHdr struct {
	// contains filtered or unexported fields
}

type MachoLoad 

type MachoLoad struct {
	// contains filtered or unexported fields
}

type MachoSect 

type MachoSect struct {
	// contains filtered or unexported fields
}

type MachoSeg 

type MachoSeg struct {
	// contains filtered or unexported fields
}

type OutBuf 

type OutBuf struct {
	// contains filtered or unexported fields
}

OutBuf is a buffered file writer.

It is simlar to the Writer in cmd/internal/bio with a few small differences.

First, it tracks the output architecture and uses it to provide endian helpers.

Second, it provides a very cheap offset counter that doesn't require any system calls to read the value.

func (*OutBuf) Flush 

func (out *OutBuf) Flush()

func (*OutBuf) Offset 

func (out *OutBuf) Offset() int64

func (*OutBuf) SeekSet 

func (out *OutBuf) SeekSet(p int64)

func (*OutBuf) Write 

func (out *OutBuf) Write(v []byte) (int, error)

Write writes the contents of v to the buffer.

As Write is backed by a bufio.Writer, callers do not have to explicitly handle the returned error as long as Flush is eventually called.

func (*OutBuf) Write16 

func (out *OutBuf) Write16(v uint16)

func (*OutBuf) Write32 

func (out *OutBuf) Write32(v uint32)

func (*OutBuf) Write32b 

func (out *OutBuf) Write32b(v uint32)

func (*OutBuf) Write64 

func (out *OutBuf) Write64(v uint64)

func (*OutBuf) Write64b 

func (out *OutBuf) Write64b(v uint64)

func (*OutBuf) Write8 

func (out *OutBuf) Write8(v uint8)

func (*OutBuf) WriteByte 

func (out *OutBuf) WriteByte(v byte) error

WriteByte is an alias for Write8 to fulfill the io.ByteWriter interface.

func (*OutBuf) WriteString 

func (out *OutBuf) WriteString(s string)

func (*OutBuf) WriteStringN 

func (out *OutBuf) WriteStringN(s string, n int)

WriteStringN writes the first n bytes of s. If n is larger than len(s) then it is padded with zero bytes.

func (*OutBuf) WriteStringPad 

func (out *OutBuf) WriteStringPad(s string, n int, pad []byte)

WriteStringPad writes the first n bytes of s. If n is larger than len(s) then it is padded with the bytes in pad (repeated as needed).

type Pciter 

type Pciter struct {
	// contains filtered or unexported fields
}

type Pkg 

type Pkg struct {
	// contains filtered or unexported fields
}

type Rpath 

type Rpath struct {
	// contains filtered or unexported fields
}

func (*Rpath) Set 

func (r *Rpath) Set(val string) error

func (*Rpath) String 

func (r *Rpath) String() string

type Shlib 

type Shlib struct {
	Path string
	Hash []byte
	Deps []string
	File *elf.File
	// contains filtered or unexported fields
}

type SymbolType 

type SymbolType int8
const (
	// see also https://9p.io/magic/man2html/1/nm
	TextSym      SymbolType = 'T'
	DataSym      SymbolType = 'D'
	BSSSym       SymbolType = 'B'
	UndefinedSym SymbolType = 'U'
	TLSSym       SymbolType = 't'
	FrameSym     SymbolType = 'm'
	ParamSym     SymbolType = 'p'
	AutoSym      SymbolType = 'a'

	// Deleted auto (not a real sym, just placeholder for type)
	DeletedAutoSym = 'x'
)

Source Files

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