/
elf.go
2827 lines (2509 loc) · 69.2 KB
/
elf.go
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ld
import (
"cmd/internal/objabi"
"cmd/internal/sys"
"cmd/link/internal/sym"
"crypto/sha1"
"encoding/binary"
"encoding/hex"
"io"
"path/filepath"
"sort"
"strings"
)
/*
* Derived from:
* $FreeBSD: src/sys/sys/elf32.h,v 1.8.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf64.h,v 1.10.14.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/sys/elf_common.h,v 1.15.8.1 2005/12/30 22:13:58 marcel Exp $
* $FreeBSD: src/sys/alpha/include/elf.h,v 1.14 2003/09/25 01:10:22 peter Exp $
* $FreeBSD: src/sys/amd64/include/elf.h,v 1.18 2004/08/03 08:21:48 dfr Exp $
* $FreeBSD: src/sys/arm/include/elf.h,v 1.5.2.1 2006/06/30 21:42:52 cognet Exp $
* $FreeBSD: src/sys/i386/include/elf.h,v 1.16 2004/08/02 19:12:17 dfr Exp $
* $FreeBSD: src/sys/powerpc/include/elf.h,v 1.7 2004/11/02 09:47:01 ssouhlal Exp $
* $FreeBSD: src/sys/sparc64/include/elf.h,v 1.12 2003/09/25 01:10:26 peter Exp $
*
* Copyright (c) 1996-1998 John D. Polstra. All rights reserved.
* Copyright (c) 2001 David E. O'Brien
* Portions Copyright 2009 The Go Authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* ELF definitions that are independent of architecture or word size.
*/
/*
* Note header. The ".note" section contains an array of notes. Each
* begins with this header, aligned to a word boundary. Immediately
* following the note header is n_namesz bytes of name, padded to the
* next word boundary. Then comes n_descsz bytes of descriptor, again
* padded to a word boundary. The values of n_namesz and n_descsz do
* not include the padding.
*/
type elfNote struct {
nNamesz uint32
nDescsz uint32
nType uint32
}
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
)
/* For accessing the fields of r_info. */
/* For constructing r_info from field values. */
/*
* Relocation types.
*/
const (
R_X86_64_NONE = 0
R_X86_64_64 = 1
R_X86_64_PC32 = 2
R_X86_64_GOT32 = 3
R_X86_64_PLT32 = 4
R_X86_64_COPY = 5
R_X86_64_GLOB_DAT = 6
R_X86_64_JMP_SLOT = 7
R_X86_64_RELATIVE = 8
R_X86_64_GOTPCREL = 9
R_X86_64_32 = 10
R_X86_64_32S = 11
R_X86_64_16 = 12
R_X86_64_PC16 = 13
R_X86_64_8 = 14
R_X86_64_PC8 = 15
R_X86_64_DTPMOD64 = 16
R_X86_64_DTPOFF64 = 17
R_X86_64_TPOFF64 = 18
R_X86_64_TLSGD = 19
R_X86_64_TLSLD = 20
R_X86_64_DTPOFF32 = 21
R_X86_64_GOTTPOFF = 22
R_X86_64_TPOFF32 = 23
R_X86_64_PC64 = 24
R_X86_64_GOTOFF64 = 25
R_X86_64_GOTPC32 = 26
R_X86_64_GOT64 = 27
R_X86_64_GOTPCREL64 = 28
R_X86_64_GOTPC64 = 29
R_X86_64_GOTPLT64 = 30
R_X86_64_PLTOFF64 = 31
R_X86_64_SIZE32 = 32
R_X86_64_SIZE64 = 33
R_X86_64_GOTPC32_TLSDEC = 34
R_X86_64_TLSDESC_CALL = 35
R_X86_64_TLSDESC = 36
R_X86_64_IRELATIVE = 37
R_X86_64_PC32_BND = 40
R_X86_64_GOTPCRELX = 41
R_X86_64_REX_GOTPCRELX = 42
R_AARCH64_ABS64 = 257
R_AARCH64_ABS32 = 258
R_AARCH64_CALL26 = 283
R_AARCH64_ADR_PREL_PG_HI21 = 275
R_AARCH64_ADD_ABS_LO12_NC = 277
R_AARCH64_LDST8_ABS_LO12_NC = 278
R_AARCH64_LDST16_ABS_LO12_NC = 284
R_AARCH64_LDST32_ABS_LO12_NC = 285
R_AARCH64_LDST64_ABS_LO12_NC = 286
R_AARCH64_ADR_GOT_PAGE = 311
R_AARCH64_LD64_GOT_LO12_NC = 312
R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21 = 541
R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC = 542
R_AARCH64_TLSLE_MOVW_TPREL_G0 = 547
R_ALPHA_NONE = 0
R_ALPHA_REFLONG = 1
R_ALPHA_REFQUAD = 2
R_ALPHA_GPREL32 = 3
R_ALPHA_LITERAL = 4
R_ALPHA_LITUSE = 5
R_ALPHA_GPDISP = 6
R_ALPHA_BRADDR = 7
R_ALPHA_HINT = 8
R_ALPHA_SREL16 = 9
R_ALPHA_SREL32 = 10
R_ALPHA_SREL64 = 11
R_ALPHA_OP_PUSH = 12
R_ALPHA_OP_STORE = 13
R_ALPHA_OP_PSUB = 14
R_ALPHA_OP_PRSHIFT = 15
R_ALPHA_GPVALUE = 16
R_ALPHA_GPRELHIGH = 17
R_ALPHA_GPRELLOW = 18
R_ALPHA_IMMED_GP_16 = 19
R_ALPHA_IMMED_GP_HI32 = 20
R_ALPHA_IMMED_SCN_HI32 = 21
R_ALPHA_IMMED_BR_HI32 = 22
R_ALPHA_IMMED_LO32 = 23
R_ALPHA_COPY = 24
R_ALPHA_GLOB_DAT = 25
R_ALPHA_JMP_SLOT = 26
R_ALPHA_RELATIVE = 27
R_ARM_NONE = 0
R_ARM_PC24 = 1
R_ARM_ABS32 = 2
R_ARM_REL32 = 3
R_ARM_PC13 = 4
R_ARM_ABS16 = 5
R_ARM_ABS12 = 6
R_ARM_THM_ABS5 = 7
R_ARM_ABS8 = 8
R_ARM_SBREL32 = 9
R_ARM_THM_PC22 = 10
R_ARM_THM_PC8 = 11
R_ARM_AMP_VCALL9 = 12
R_ARM_SWI24 = 13
R_ARM_THM_SWI8 = 14
R_ARM_XPC25 = 15
R_ARM_THM_XPC22 = 16
R_ARM_COPY = 20
R_ARM_GLOB_DAT = 21
R_ARM_JUMP_SLOT = 22
R_ARM_RELATIVE = 23
R_ARM_GOTOFF = 24
R_ARM_GOTPC = 25
R_ARM_GOT32 = 26
R_ARM_PLT32 = 27
R_ARM_CALL = 28
R_ARM_JUMP24 = 29
R_ARM_V4BX = 40
R_ARM_GOT_PREL = 96
R_ARM_GNU_VTENTRY = 100
R_ARM_GNU_VTINHERIT = 101
R_ARM_TLS_IE32 = 107
R_ARM_TLS_LE32 = 108
R_ARM_RSBREL32 = 250
R_ARM_THM_RPC22 = 251
R_ARM_RREL32 = 252
R_ARM_RABS32 = 253
R_ARM_RPC24 = 254
R_ARM_RBASE = 255
R_386_NONE = 0
R_386_32 = 1
R_386_PC32 = 2
R_386_GOT32 = 3
R_386_PLT32 = 4
R_386_COPY = 5
R_386_GLOB_DAT = 6
R_386_JMP_SLOT = 7
R_386_RELATIVE = 8
R_386_GOTOFF = 9
R_386_GOTPC = 10
R_386_TLS_TPOFF = 14
R_386_TLS_IE = 15
R_386_TLS_GOTIE = 16
R_386_TLS_LE = 17
R_386_TLS_GD = 18
R_386_TLS_LDM = 19
R_386_TLS_GD_32 = 24
R_386_TLS_GD_PUSH = 25
R_386_TLS_GD_CALL = 26
R_386_TLS_GD_POP = 27
R_386_TLS_LDM_32 = 28
R_386_TLS_LDM_PUSH = 29
R_386_TLS_LDM_CALL = 30
R_386_TLS_LDM_POP = 31
R_386_TLS_LDO_32 = 32
R_386_TLS_IE_32 = 33
R_386_TLS_LE_32 = 34
R_386_TLS_DTPMOD32 = 35
R_386_TLS_DTPOFF32 = 36
R_386_TLS_TPOFF32 = 37
R_386_TLS_GOTDESC = 39
R_386_TLS_DESC_CALL = 40
R_386_TLS_DESC = 41
R_386_IRELATIVE = 42
R_386_GOT32X = 43
R_MIPS_NONE = 0
R_MIPS_16 = 1
R_MIPS_32 = 2
R_MIPS_REL32 = 3
R_MIPS_26 = 4
R_MIPS_HI16 = 5
R_MIPS_LO16 = 6
R_MIPS_GPREL16 = 7
R_MIPS_LITERAL = 8
R_MIPS_GOT16 = 9
R_MIPS_PC16 = 10
R_MIPS_CALL16 = 11
R_MIPS_GPREL32 = 12
R_MIPS_SHIFT5 = 16
R_MIPS_SHIFT6 = 17
R_MIPS_64 = 18
R_MIPS_GOT_DISP = 19
R_MIPS_GOT_PAGE = 20
R_MIPS_GOT_OFST = 21
R_MIPS_GOT_HI16 = 22
R_MIPS_GOT_LO16 = 23
R_MIPS_SUB = 24
R_MIPS_INSERT_A = 25
R_MIPS_INSERT_B = 26
R_MIPS_DELETE = 27
R_MIPS_HIGHER = 28
R_MIPS_HIGHEST = 29
R_MIPS_CALL_HI16 = 30
R_MIPS_CALL_LO16 = 31
R_MIPS_SCN_DISP = 32
R_MIPS_REL16 = 33
R_MIPS_ADD_IMMEDIATE = 34
R_MIPS_PJUMP = 35
R_MIPS_RELGOT = 36
R_MIPS_JALR = 37
R_MIPS_TLS_DTPMOD32 = 38
R_MIPS_TLS_DTPREL32 = 39
R_MIPS_TLS_DTPMOD64 = 40
R_MIPS_TLS_DTPREL64 = 41
R_MIPS_TLS_GD = 42
R_MIPS_TLS_LDM = 43
R_MIPS_TLS_DTPREL_HI16 = 44
R_MIPS_TLS_DTPREL_LO16 = 45
R_MIPS_TLS_GOTTPREL = 46
R_MIPS_TLS_TPREL32 = 47
R_MIPS_TLS_TPREL64 = 48
R_MIPS_TLS_TPREL_HI16 = 49
R_MIPS_TLS_TPREL_LO16 = 50
R_PPC_NONE = 0
R_PPC_ADDR32 = 1
R_PPC_ADDR24 = 2
R_PPC_ADDR16 = 3
R_PPC_ADDR16_LO = 4
R_PPC_ADDR16_HI = 5
R_PPC_ADDR16_HA = 6
R_PPC_ADDR14 = 7
R_PPC_ADDR14_BRTAKEN = 8
R_PPC_ADDR14_BRNTAKEN = 9
R_PPC_REL24 = 10
R_PPC_REL14 = 11
R_PPC_REL14_BRTAKEN = 12
R_PPC_REL14_BRNTAKEN = 13
R_PPC_GOT16 = 14
R_PPC_GOT16_LO = 15
R_PPC_GOT16_HI = 16
R_PPC_GOT16_HA = 17
R_PPC_PLTREL24 = 18
R_PPC_COPY = 19
R_PPC_GLOB_DAT = 20
R_PPC_JMP_SLOT = 21
R_PPC_RELATIVE = 22
R_PPC_LOCAL24PC = 23
R_PPC_UADDR32 = 24
R_PPC_UADDR16 = 25
R_PPC_REL32 = 26
R_PPC_PLT32 = 27
R_PPC_PLTREL32 = 28
R_PPC_PLT16_LO = 29
R_PPC_PLT16_HI = 30
R_PPC_PLT16_HA = 31
R_PPC_SDAREL16 = 32
R_PPC_SECTOFF = 33
R_PPC_SECTOFF_LO = 34
R_PPC_SECTOFF_HI = 35
R_PPC_SECTOFF_HA = 36
R_PPC_TLS = 67
R_PPC_DTPMOD32 = 68
R_PPC_TPREL16 = 69
R_PPC_TPREL16_LO = 70
R_PPC_TPREL16_HI = 71
R_PPC_TPREL16_HA = 72
R_PPC_TPREL32 = 73
R_PPC_DTPREL16 = 74
R_PPC_DTPREL16_LO = 75
R_PPC_DTPREL16_HI = 76
R_PPC_DTPREL16_HA = 77
R_PPC_DTPREL32 = 78
R_PPC_GOT_TLSGD16 = 79
R_PPC_GOT_TLSGD16_LO = 80
R_PPC_GOT_TLSGD16_HI = 81
R_PPC_GOT_TLSGD16_HA = 82
R_PPC_GOT_TLSLD16 = 83
R_PPC_GOT_TLSLD16_LO = 84
R_PPC_GOT_TLSLD16_HI = 85
R_PPC_GOT_TLSLD16_HA = 86
R_PPC_GOT_TPREL16 = 87
R_PPC_GOT_TPREL16_LO = 88
R_PPC_GOT_TPREL16_HI = 89
R_PPC_GOT_TPREL16_HA = 90
R_PPC_EMB_NADDR32 = 101
R_PPC_EMB_NADDR16 = 102
R_PPC_EMB_NADDR16_LO = 103
R_PPC_EMB_NADDR16_HI = 104
R_PPC_EMB_NADDR16_HA = 105
R_PPC_EMB_SDAI16 = 106
R_PPC_EMB_SDA2I16 = 107
R_PPC_EMB_SDA2REL = 108
R_PPC_EMB_SDA21 = 109
R_PPC_EMB_MRKREF = 110
R_PPC_EMB_RELSEC16 = 111
R_PPC_EMB_RELST_LO = 112
R_PPC_EMB_RELST_HI = 113
R_PPC_EMB_RELST_HA = 114
R_PPC_EMB_BIT_FLD = 115
R_PPC_EMB_RELSDA = 116
R_PPC64_ADDR32 = R_PPC_ADDR32
R_PPC64_ADDR16_LO = R_PPC_ADDR16_LO
R_PPC64_ADDR16_HA = R_PPC_ADDR16_HA
R_PPC64_REL24 = R_PPC_REL24
R_PPC64_GOT16_HA = R_PPC_GOT16_HA
R_PPC64_JMP_SLOT = R_PPC_JMP_SLOT
R_PPC64_TPREL16 = R_PPC_TPREL16
R_PPC64_ADDR64 = 38
R_PPC64_TOC16 = 47
R_PPC64_TOC16_LO = 48
R_PPC64_TOC16_HI = 49
R_PPC64_TOC16_HA = 50
R_PPC64_ADDR16_LO_DS = 57
R_PPC64_GOT16_LO_DS = 59
R_PPC64_TOC16_DS = 63
R_PPC64_TOC16_LO_DS = 64
R_PPC64_TLS = 67
R_PPC64_GOT_TPREL16_LO_DS = 88
R_PPC64_GOT_TPREL16_HA = 90
R_PPC64_REL16_LO = 250
R_PPC64_REL16_HI = 251
R_PPC64_REL16_HA = 252
R_SPARC_NONE = 0
R_SPARC_8 = 1
R_SPARC_16 = 2
R_SPARC_32 = 3
R_SPARC_DISP8 = 4
R_SPARC_DISP16 = 5
R_SPARC_DISP32 = 6
R_SPARC_WDISP30 = 7
R_SPARC_WDISP22 = 8
R_SPARC_HI22 = 9
R_SPARC_22 = 10
R_SPARC_13 = 11
R_SPARC_LO10 = 12
R_SPARC_GOT10 = 13
R_SPARC_GOT13 = 14
R_SPARC_GOT22 = 15
R_SPARC_PC10 = 16
R_SPARC_PC22 = 17
R_SPARC_WPLT30 = 18
R_SPARC_COPY = 19
R_SPARC_GLOB_DAT = 20
R_SPARC_JMP_SLOT = 21
R_SPARC_RELATIVE = 22
R_SPARC_UA32 = 23
R_SPARC_PLT32 = 24
R_SPARC_HIPLT22 = 25
R_SPARC_LOPLT10 = 26
R_SPARC_PCPLT32 = 27
R_SPARC_PCPLT22 = 28
R_SPARC_PCPLT10 = 29
R_SPARC_10 = 30
R_SPARC_11 = 31
R_SPARC_64 = 32
R_SPARC_OLO10 = 33
R_SPARC_HH22 = 34
R_SPARC_HM10 = 35
R_SPARC_LM22 = 36
R_SPARC_PC_HH22 = 37
R_SPARC_PC_HM10 = 38
R_SPARC_PC_LM22 = 39
R_SPARC_WDISP16 = 40
R_SPARC_WDISP19 = 41
R_SPARC_GLOB_JMP = 42
R_SPARC_7 = 43
R_SPARC_5 = 44
R_SPARC_6 = 45
R_SPARC_DISP64 = 46
R_SPARC_PLT64 = 47
R_SPARC_HIX22 = 48
R_SPARC_LOX10 = 49
R_SPARC_H44 = 50
R_SPARC_M44 = 51
R_SPARC_L44 = 52
R_SPARC_REGISTER = 53
R_SPARC_UA64 = 54
R_SPARC_UA16 = 55
R_390_NONE = 0
R_390_8 = 1
R_390_12 = 2
R_390_16 = 3
R_390_32 = 4
R_390_PC32 = 5
R_390_GOT12 = 6
R_390_GOT32 = 7
R_390_PLT32 = 8
R_390_COPY = 9
R_390_GLOB_DAT = 10
R_390_JMP_SLOT = 11
R_390_RELATIVE = 12
R_390_GOTOFF = 13
R_390_GOTPC = 14
R_390_GOT16 = 15
R_390_PC16 = 16
R_390_PC16DBL = 17
R_390_PLT16DBL = 18
R_390_PC32DBL = 19
R_390_PLT32DBL = 20
R_390_GOTPCDBL = 21
R_390_64 = 22
R_390_PC64 = 23
R_390_GOT64 = 24
R_390_PLT64 = 25
R_390_GOTENT = 26
R_390_GOTOFF16 = 27
R_390_GOTOFF64 = 28
R_390_GOTPLT12 = 29
R_390_GOTPLT16 = 30
R_390_GOTPLT32 = 31
R_390_GOTPLT64 = 32
R_390_GOTPLTENT = 33
R_390_GOTPLTOFF16 = 34
R_390_GOTPLTOFF32 = 35
R_390_GOTPLTOFF64 = 36
R_390_TLS_LOAD = 37
R_390_TLS_GDCALL = 38
R_390_TLS_LDCALL = 39
R_390_TLS_GD32 = 40
R_390_TLS_GD64 = 41
R_390_TLS_GOTIE12 = 42
R_390_TLS_GOTIE32 = 43
R_390_TLS_GOTIE64 = 44
R_390_TLS_LDM32 = 45
R_390_TLS_LDM64 = 46
R_390_TLS_IE32 = 47
R_390_TLS_IE64 = 48
R_390_TLS_IEENT = 49
R_390_TLS_LE32 = 50
R_390_TLS_LE64 = 51
R_390_TLS_LDO32 = 52
R_390_TLS_LDO64 = 53
R_390_TLS_DTPMOD = 54
R_390_TLS_DTPOFF = 55
R_390_TLS_TPOFF = 56
R_390_20 = 57
R_390_GOT20 = 58
R_390_GOTPLT20 = 59
R_390_TLS_GOTIE20 = 60
ARM_MAGIC_TRAMP_NUMBER = 0x5c000003
)
/*
* Symbol table entries.
*/
/* For accessing the fields of st_info. */
/* For constructing st_info from field values. */
/* For accessing the fields of st_other. */
/*
* ELF header.
*/
type ElfEhdr struct {
ident [EI_NIDENT]uint8
type_ uint16
machine uint16
version uint32
entry uint64
phoff uint64
shoff uint64
flags uint32
ehsize uint16
phentsize uint16
phnum uint16
shentsize uint16
shnum uint16
shstrndx uint16
}
/*
* Section header.
*/
type ElfShdr struct {
name uint32
type_ uint32
flags uint64
addr uint64
off uint64
size uint64
link uint32
info uint32
addralign uint64
entsize uint64
shnum int
}
/*
* Program header.
*/
type ElfPhdr struct {
type_ uint32
flags uint32
off uint64
vaddr uint64
paddr uint64
filesz uint64
memsz uint64
align uint64
}
/* For accessing the fields of r_info. */
/* For constructing r_info from field values. */
/*
* Symbol table entries.
*/
/* For accessing the fields of st_info. */
/* For constructing st_info from field values. */
/* For accessing the fields of st_other. */
/*
* Go linker interface
*/
const (
ELF64HDRSIZE = 64
ELF64PHDRSIZE = 56
ELF64SHDRSIZE = 64
ELF64RELSIZE = 16
ELF64RELASIZE = 24
ELF64SYMSIZE = 24
ELF32HDRSIZE = 52
ELF32PHDRSIZE = 32
ELF32SHDRSIZE = 40
ELF32SYMSIZE = 16
ELF32RELSIZE = 8
)
/*
* The interface uses the 64-bit structures always,
* to avoid code duplication. The writers know how to
* marshal a 32-bit representation from the 64-bit structure.
*/
var Elfstrdat []byte
/*
* 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.
*/
const (
ELFRESERVE = 4096
)
/*
* 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.
*/
const (
NSECT = 400
)
var (
Iself bool
Nelfsym = 1
elf64 bool
// Either ".rel" or ".rela" depending on which type of relocation the
// target platform uses.
elfRelType string
ehdr ElfEhdr
phdr [NSECT]*ElfPhdr
shdr [NSECT]*ElfShdr
interp string
)
type Elfstring struct {
s string
off int
}
var elfstr [100]Elfstring
var nelfstr int
var buildinfo []byte
/*
Initialize the global variable that describes the ELF header. It will be updated as
we write section and prog headers.
*/
func Elfinit(ctxt *Link) {
Iself = true
if ctxt.Arch.InFamily(sys.AMD64, sys.ARM64, sys.MIPS64, sys.PPC64, sys.S390X) {
elfRelType = ".rela"
} else {
elfRelType = ".rel"
}
switch ctxt.Arch.Family {
// 64-bit architectures
case sys.PPC64, sys.S390X:
if ctxt.Arch.ByteOrder == binary.BigEndian {
ehdr.flags = 1 /* Version 1 ABI */
} else {
ehdr.flags = 2 /* Version 2 ABI */
}
fallthrough
case sys.AMD64, sys.ARM64, sys.MIPS64:
if ctxt.Arch.Family == sys.MIPS64 {
ehdr.flags = 0x20000004 /* MIPS 3 CPIC */
}
elf64 = true
ehdr.phoff = ELF64HDRSIZE /* Must be be ELF64HDRSIZE: first PHdr must follow ELF header */
ehdr.shoff = ELF64HDRSIZE /* Will move as we add PHeaders */
ehdr.ehsize = ELF64HDRSIZE /* Must be ELF64HDRSIZE */
ehdr.phentsize = ELF64PHDRSIZE /* Must be ELF64PHDRSIZE */
ehdr.shentsize = ELF64SHDRSIZE /* Must be ELF64SHDRSIZE */
// 32-bit architectures
case sys.ARM, sys.MIPS:
if ctxt.Arch.Family == sys.ARM {
// we use EABI on linux/arm, freebsd/arm, netbsd/arm.
if Headtype == objabi.Hlinux || Headtype == objabi.Hfreebsd || Headtype == objabi.Hnetbsd {
// We set a value here that makes no indication of which
// float ABI the object uses, because this is information
// used by the dynamic linker to compare executables and
// shared libraries -- so it only matters for cgo calls, and
// the information properly comes from the object files
// produced by the host C compiler. parseArmAttributes in
// ldelf.go reads that information and updates this field as
// appropriate.
ehdr.flags = 0x5000002 // has entry point, Version5 EABI
}
} else if ctxt.Arch.Family == sys.MIPS {
ehdr.flags = 0x50001004 /* MIPS 32 CPIC O32*/
}
fallthrough
default:
ehdr.phoff = ELF32HDRSIZE
/* Must be be ELF32HDRSIZE: first PHdr must follow ELF header */
ehdr.shoff = ELF32HDRSIZE /* Will move as we add PHeaders */
ehdr.ehsize = ELF32HDRSIZE /* Must be ELF32HDRSIZE */
ehdr.phentsize = ELF32PHDRSIZE /* Must be ELF32PHDRSIZE */
ehdr.shentsize = ELF32SHDRSIZE /* Must be ELF32SHDRSIZE */
}
}
// Make sure PT_LOAD is aligned properly and
// that there is no gap,
// correct ELF loaders will do this implicitly,
// but buggy ELF loaders like the one in some
// versions of QEMU and UPX won't.
func fixElfPhdr(e *ElfPhdr) {
frag := int(e.vaddr & (e.align - 1))
e.off -= uint64(frag)
e.vaddr -= uint64(frag)
e.paddr -= uint64(frag)
e.filesz += uint64(frag)
e.memsz += uint64(frag)
}
func elf64phdr(out *OutBuf, e *ElfPhdr) {
if e.type_ == PT_LOAD {
fixElfPhdr(e)
}
out.Write32(e.type_)
out.Write32(e.flags)
out.Write64(e.off)