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old-cross-binutils/bfd/elf32-ppc.c
Michael Meissner 0293d5b019 Do not put small common symbols into .sbss if ld -r
1996-05-24 18:30:52 +00:00

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/* PowerPC-specific support for 32-bit ELF
Copyright 1994, 1995, 1996 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* This file is based on a preliminary PowerPC ELF ABI. The
information may not match the final PowerPC ELF ABI. It includes
suggestions from the in-progress Embedded PowerPC ABI, and that
information may also not match. */
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/ppc.h"
#define USE_RELA /* we want RELA relocations, not REL */
/* PowerPC relocations defined by the ABIs */
enum ppc_reloc_type
{
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,
/* The remaining relocs are from the Embedded ELF ABI, and are not
in the SVR4 ELF ABI. */
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,
/* This is a phony reloc to handle any old fashioned TOC16 references
that may still be in object files. */
R_PPC_TOC16 = 255,
R_PPC_max
};
static reloc_howto_type *ppc_elf_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void ppc_elf_info_to_howto
PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rela *dst));
static void ppc_elf_howto_init PARAMS ((void));
static boolean ppc_elf_set_private_flags PARAMS ((bfd *, flagword));
static boolean ppc_elf_copy_private_bfd_data PARAMS ((bfd *, bfd *));
static boolean ppc_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
static int ppc_elf_additional_program_headers PARAMS ((bfd *));
static boolean ppc_elf_modify_segment_map PARAMS ((bfd *));
static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
Elf32_Internal_Shdr *,
char *));
static elf_linker_section_t *ppc_elf_create_linker_section
PARAMS ((bfd *abfd,
struct bfd_link_info *info,
enum elf_linker_section_enum));
static boolean ppc_elf_check_relocs PARAMS ((bfd *,
struct bfd_link_info *,
asection *,
const Elf_Internal_Rela *));
static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
struct elf_link_hash_entry *));
static boolean ppc_elf_adjust_dynindx PARAMS ((struct elf_link_hash_entry *, PTR));
static boolean ppc_elf_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
static boolean ppc_elf_relocate_section PARAMS ((bfd *,
struct bfd_link_info *info,
bfd *,
asection *,
bfd_byte *,
Elf_Internal_Rela *relocs,
Elf_Internal_Sym *local_syms,
asection **));
static boolean ppc_elf_add_symbol_hook PARAMS ((bfd *,
struct bfd_link_info *,
const Elf_Internal_Sym *,
const char **,
flagword *,
asection **,
bfd_vma *));
static boolean ppc_elf_finish_dynamic_symbol PARAMS ((bfd *,
struct bfd_link_info *,
struct elf_link_hash_entry *,
Elf_Internal_Sym *));
static boolean ppc_elf_finish_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *));
#define BRANCH_PREDICT_BIT 0x200000 /* branch prediction bit for branch taken relocs */
#define RA_REGISTER_MASK 0x001f0000 /* mask to set RA in memory instructions */
#define RA_REGISTER_SHIFT 16 /* value to shift register by to insert RA */
/* The name of the dynamic interpreter. This is put in the .interp
section. */
#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
/* The size in bytes of an entry in the procedure linkage table, and of the initial size
of the plt reserved for the dynamic linker. */
#define PLT_ENTRY_SIZE 12
#define PLT_INITIAL_ENTRY_SIZE 72
static reloc_howto_type *ppc_elf_howto_table[ (int)R_PPC_max ];
static reloc_howto_type ppc_elf_howto_raw[] =
{
/* This reloc does nothing. */
HOWTO (R_PPC_NONE, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* A standard 32 bit relocation. */
HOWTO (R_PPC_ADDR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* An absolute 26 bit branch; the lower two bits must be zero.
FIXME: we don't check that, we just clear them. */
HOWTO (R_PPC_ADDR24, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR24", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3fffffc, /* dst_mask */
false), /* pcrel_offset */
/* A standard 16 bit relocation. */
HOWTO (R_PPC_ADDR16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* A 16 bit relocation without overflow. */
HOWTO (R_PPC_ADDR16_LO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR16_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The high order 16 bits of an address. */
HOWTO (R_PPC_ADDR16_HI, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR16_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The high order 16 bits of an address, plus 1 if the contents of
the low 16 bits, treated as a signed number, is negative. */
HOWTO (R_PPC_ADDR16_HA, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR16_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* An absolute 16 bit branch; the lower two bits must be zero.
FIXME: we don't check that, we just clear them. */
HOWTO (R_PPC_ADDR14, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR14", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
false), /* pcrel_offset */
/* An absolute 16 bit branch, for which bit 10 should be set to
indicate that the branch is expected to be taken. The lower two
bits must be zero. */
HOWTO (R_PPC_ADDR14_BRTAKEN, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR14_BRTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
false), /* pcrel_offset */
/* An absolute 16 bit branch, for which bit 10 should be set to
indicate that the branch is not expected to be taken. The lower
two bits must be zero. */
HOWTO (R_PPC_ADDR14_BRNTAKEN, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_ADDR14_BRNTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
false), /* pcrel_offset */
/* A relative 26 bit branch; the lower two bits must be zero. */
HOWTO (R_PPC_REL24, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL24", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3fffffc, /* dst_mask */
true), /* pcrel_offset */
/* A relative 16 bit branch; the lower two bits must be zero. */
HOWTO (R_PPC_REL14, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL14", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
true), /* pcrel_offset */
/* A relative 16 bit branch. Bit 10 should be set to indicate that
the branch is expected to be taken. The lower two bits must be
zero. */
HOWTO (R_PPC_REL14_BRTAKEN, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL14_BRTAKEN", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
true), /* pcrel_offset */
/* A relative 16 bit branch. Bit 10 should be set to indicate that
the branch is not expected to be taken. The lower two bits must
be zero. */
HOWTO (R_PPC_REL14_BRNTAKEN, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL14_BRNTAKEN",/* name */
false, /* partial_inplace */
0, /* src_mask */
0xfffc, /* dst_mask */
true), /* pcrel_offset */
/* Like R_PPC_ADDR16, but referring to the GOT table entry for the
symbol. */
HOWTO (R_PPC_GOT16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16_LO, but referring to the GOT table entry for
the symbol. */
HOWTO (R_PPC_GOT16_LO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16_HI, but referring to the GOT table entry for
the symbol. */
HOWTO (R_PPC_GOT16_HI, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16_HA, but referring to the GOT table entry for
the symbol. */
HOWTO (R_PPC_GOT16_HA, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GOT16_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_REL24, but referring to the procedure linkage table
entry for the symbol. FIXME: Not supported. */
HOWTO (R_PPC_PLTREL24, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLTREL24", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3fffffc, /* dst_mask */
true), /* pcrel_offset */
/* This is used only by the dynamic linker. The symbol should exist
both in the object being run and in some shared library. The
dynamic linker copies the data addressed by the symbol from the
shared library into the object. I have no idea what the purpose
of this is. */
HOWTO (R_PPC_COPY, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_COPY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR32, but used when setting global offset table
entries. */
HOWTO (R_PPC_GLOB_DAT, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_GLOB_DAT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Marks a procedure linkage table entry for a symbol. */
HOWTO (R_PPC_JMP_SLOT, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_JMP_SLOT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Used only by the dynamic linker. When the object is run, this
longword is set to the load address of the object, plus the
addend. */
HOWTO (R_PPC_RELATIVE, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_RELATIVE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_REL24, but uses the value of the symbol within the
object rather than the final value. Normally used for
_GLOBAL_OFFSET_TABLE_. FIXME: Not supported. */
HOWTO (R_PPC_LOCAL24PC, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_LOCAL24PC", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x3fffffc, /* dst_mask */
true), /* pcrel_offset */
/* Like R_PPC_ADDR32, but may be unaligned. */
HOWTO (R_PPC_UADDR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_UADDR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16, but may be unaligned. */
HOWTO (R_PPC_UADDR16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_UADDR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit PC relative */
HOWTO (R_PPC_REL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_REL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* 32-bit relocation to the symbol's procedure linkage table.
FIXEME: not supported. */
HOWTO (R_PPC_PLT32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLT32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit PC relative relocation to the symbol's procedure linkage table.
FIXEME: not supported. */
HOWTO (R_PPC_PLTREL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLTREL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* Like R_PPC_ADDR16_LO, but referring to the PLT table entry for
the symbol. */
HOWTO (R_PPC_PLT16_LO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLT16_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16_HI, but referring to the PLT table entry for
the symbol. */
HOWTO (R_PPC_PLT16_HI, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLT16_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Like R_PPC_ADDR16_HA, but referring to the PLT table entry for
the symbol. FIXME: Not supported. */
HOWTO (R_PPC_PLT16_HA, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_PLT16_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* A sign-extended 16 bit value relative to _SDA_BASE_, for use with
small data items. */
HOWTO (R_PPC_SDAREL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SDAREL16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 32-bit section relative relocation. */
HOWTO (R_PPC_SECTOFF, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SECTOFF", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* 16-bit lower half section relative relocation. */
HOWTO (R_PPC_SECTOFF_LO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SECTOFF_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit upper half section relative relocation. */
HOWTO (R_PPC_SECTOFF_HI, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SECTOFF_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 16-bit upper half adjusted section relative relocation. */
HOWTO (R_PPC_SECTOFF_HA, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_SECTOFF_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The remaining relocs are from the Embedded ELF ABI, and are not
in the SVR4 ELF ABI. */
/* 32 bit value resulting from the addend minus the symbol */
HOWTO (R_PPC_EMB_NADDR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_NADDR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit value resulting from the addend minus the symbol */
HOWTO (R_PPC_EMB_NADDR16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_NADDR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit value resulting from the addend minus the symbol */
HOWTO (R_PPC_EMB_NADDR16_LO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_ADDR16_LO", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The high order 16 bits of the addend minus the symbol */
HOWTO (R_PPC_EMB_NADDR16_HI, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_NADDR16_HI", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The high order 16 bits of the result of the addend minus the address,
plus 1 if the contents of the low 16 bits, treated as a signed number,
is negative. */
HOWTO (R_PPC_EMB_NADDR16_HA, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_NADDR16_HA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit value resulting from allocating a 4 byte word to hold an
address in the .sdata section, and returning the offset from
_SDA_BASE_ for that relocation */
HOWTO (R_PPC_EMB_SDAI16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_SDAI16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit value resulting from allocating a 4 byte word to hold an
address in the .sdata2 section, and returning the offset from
_SDA2_BASE_ for that relocation */
HOWTO (R_PPC_EMB_SDA2I16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_SDA2I16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* A sign-extended 16 bit value relative to _SDA2_BASE_, for use with
small data items. */
HOWTO (R_PPC_EMB_SDA2REL, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_SDA2REL", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Relocate against either _SDA_BASE_ or _SDA2_BASE_, filling in the 16 bit
signed offset from the appropriate base, and filling in the register
field with the appropriate register (0, 2, or 13). */
HOWTO (R_PPC_EMB_SDA21, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_SDA21", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Relocation not handled: R_PPC_EMB_MRKREF */
/* Relocation not handled: R_PPC_EMB_RELSEC16 */
/* Relocation not handled: R_PPC_EMB_RELST_LO */
/* Relocation not handled: R_PPC_EMB_RELST_HI */
/* Relocation not handled: R_PPC_EMB_RELST_HA */
/* Relocation not handled: R_PPC_EMB_BIT_FLD */
/* PC relative relocation against either _SDA_BASE_ or _SDA2_BASE_, filling
in the 16 bit signed offset from the appropriate base, and filling in the
register field with the appropriate register (0, 2, or 13). */
HOWTO (R_PPC_EMB_RELSDA, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_EMB_RELSDA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Phony reloc to handle AIX style TOC entries */
HOWTO (R_PPC_TOC16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_PPC_TOC16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
};
/* Initialize the ppc_elf_howto_table, so that linear accesses can be done. */
static void
ppc_elf_howto_init ()
{
unsigned int i, type;
for (i = 0; i < sizeof (ppc_elf_howto_raw) / sizeof (ppc_elf_howto_raw[0]); i++)
{
type = ppc_elf_howto_raw[i].type;
BFD_ASSERT (type < sizeof(ppc_elf_howto_table) / sizeof(ppc_elf_howto_table[0]));
ppc_elf_howto_table[type] = &ppc_elf_howto_raw[i];
}
}
static reloc_howto_type *
ppc_elf_reloc_type_lookup (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
enum ppc_reloc_type ppc_reloc = R_PPC_NONE;
if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
ppc_elf_howto_init ();
switch ((int)code)
{
default:
return (reloc_howto_type *)NULL;
case BFD_RELOC_NONE: ppc_reloc = R_PPC_NONE; break;
case BFD_RELOC_32: ppc_reloc = R_PPC_ADDR32; break;
case BFD_RELOC_PPC_BA26: ppc_reloc = R_PPC_ADDR24; break;
case BFD_RELOC_16: ppc_reloc = R_PPC_ADDR16; break;
case BFD_RELOC_LO16: ppc_reloc = R_PPC_ADDR16_LO; break;
case BFD_RELOC_HI16: ppc_reloc = R_PPC_ADDR16_HI; break;
case BFD_RELOC_HI16_S: ppc_reloc = R_PPC_ADDR16_HA; break;
case BFD_RELOC_PPC_BA16: ppc_reloc = R_PPC_ADDR14; break;
case BFD_RELOC_PPC_BA16_BRTAKEN: ppc_reloc = R_PPC_ADDR14_BRTAKEN; break;
case BFD_RELOC_PPC_BA16_BRNTAKEN: ppc_reloc = R_PPC_ADDR14_BRNTAKEN; break;
case BFD_RELOC_PPC_B26: ppc_reloc = R_PPC_REL24; break;
case BFD_RELOC_PPC_B16: ppc_reloc = R_PPC_REL14; break;
case BFD_RELOC_PPC_B16_BRTAKEN: ppc_reloc = R_PPC_REL14_BRTAKEN; break;
case BFD_RELOC_PPC_B16_BRNTAKEN: ppc_reloc = R_PPC_REL14_BRNTAKEN; break;
case BFD_RELOC_16_GOTOFF: ppc_reloc = R_PPC_GOT16; break;
case BFD_RELOC_LO16_GOTOFF: ppc_reloc = R_PPC_GOT16_LO; break;
case BFD_RELOC_HI16_GOTOFF: ppc_reloc = R_PPC_GOT16_HI; break;
case BFD_RELOC_HI16_S_GOTOFF: ppc_reloc = R_PPC_GOT16_HA; break;
case BFD_RELOC_24_PLT_PCREL: ppc_reloc = R_PPC_PLTREL24; break;
case BFD_RELOC_PPC_COPY: ppc_reloc = R_PPC_COPY; break;
case BFD_RELOC_PPC_GLOB_DAT: ppc_reloc = R_PPC_GLOB_DAT; break;
case BFD_RELOC_PPC_LOCAL24PC: ppc_reloc = R_PPC_LOCAL24PC; break;
case BFD_RELOC_32_PCREL: ppc_reloc = R_PPC_REL32; break;
case BFD_RELOC_32_PLTOFF: ppc_reloc = R_PPC_PLT32; break;
case BFD_RELOC_32_PLT_PCREL: ppc_reloc = R_PPC_PLTREL32; break;
case BFD_RELOC_LO16_PLTOFF: ppc_reloc = R_PPC_PLT16_LO; break;
case BFD_RELOC_HI16_PLTOFF: ppc_reloc = R_PPC_PLT16_HI; break;
case BFD_RELOC_HI16_S_PLTOFF: ppc_reloc = R_PPC_PLT16_HA; break;
case BFD_RELOC_GPREL16: ppc_reloc = R_PPC_SDAREL16; break;
case BFD_RELOC_32_BASEREL: ppc_reloc = R_PPC_SECTOFF; break;
case BFD_RELOC_LO16_BASEREL: ppc_reloc = R_PPC_SECTOFF_LO; break;
case BFD_RELOC_HI16_BASEREL: ppc_reloc = R_PPC_SECTOFF_HI; break;
case BFD_RELOC_HI16_S_BASEREL: ppc_reloc = R_PPC_SECTOFF_HA; break;
case BFD_RELOC_CTOR: ppc_reloc = R_PPC_ADDR32; break;
case BFD_RELOC_PPC_TOC16: ppc_reloc = R_PPC_TOC16; break;
case BFD_RELOC_PPC_EMB_NADDR32: ppc_reloc = R_PPC_EMB_NADDR32; break;
case BFD_RELOC_PPC_EMB_NADDR16: ppc_reloc = R_PPC_EMB_NADDR16; break;
case BFD_RELOC_PPC_EMB_NADDR16_LO: ppc_reloc = R_PPC_EMB_NADDR16_LO; break;
case BFD_RELOC_PPC_EMB_NADDR16_HI: ppc_reloc = R_PPC_EMB_NADDR16_HI; break;
case BFD_RELOC_PPC_EMB_NADDR16_HA: ppc_reloc = R_PPC_EMB_NADDR16_HA; break;
case BFD_RELOC_PPC_EMB_SDAI16: ppc_reloc = R_PPC_EMB_SDAI16; break;
case BFD_RELOC_PPC_EMB_SDA2I16: ppc_reloc = R_PPC_EMB_SDA2I16; break;
case BFD_RELOC_PPC_EMB_SDA2REL: ppc_reloc = R_PPC_EMB_SDA2REL; break;
case BFD_RELOC_PPC_EMB_SDA21: ppc_reloc = R_PPC_EMB_SDA21; break;
case BFD_RELOC_PPC_EMB_MRKREF: ppc_reloc = R_PPC_EMB_MRKREF; break;
case BFD_RELOC_PPC_EMB_RELSEC16: ppc_reloc = R_PPC_EMB_RELSEC16; break;
case BFD_RELOC_PPC_EMB_RELST_LO: ppc_reloc = R_PPC_EMB_RELST_LO; break;
case BFD_RELOC_PPC_EMB_RELST_HI: ppc_reloc = R_PPC_EMB_RELST_HI; break;
case BFD_RELOC_PPC_EMB_RELST_HA: ppc_reloc = R_PPC_EMB_RELST_HA; break;
case BFD_RELOC_PPC_EMB_BIT_FLD: ppc_reloc = R_PPC_EMB_BIT_FLD; break;
case BFD_RELOC_PPC_EMB_RELSDA: ppc_reloc = R_PPC_EMB_RELSDA; break;
}
return ppc_elf_howto_table[ (int)ppc_reloc ];
};
/* Set the howto pointer for a PowerPC ELF reloc. */
static void
ppc_elf_info_to_howto (abfd, cache_ptr, dst)
bfd *abfd;
arelent *cache_ptr;
Elf32_Internal_Rela *dst;
{
if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
ppc_elf_howto_init ();
BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_PPC_max);
cache_ptr->howto = ppc_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
}
/* Function to set whether a module needs the -mrelocatable bit set. */
static boolean
ppc_elf_set_private_flags (abfd, flags)
bfd *abfd;
flagword flags;
{
BFD_ASSERT (!elf_flags_init (abfd)
|| elf_elfheader (abfd)->e_flags == flags);
elf_elfheader (abfd)->e_flags = flags;
elf_flags_init (abfd) = true;
return true;
}
/* Copy backend specific data from one object module to another */
static boolean
ppc_elf_copy_private_bfd_data (ibfd, obfd)
bfd *ibfd;
bfd *obfd;
{
/* This function is selected based on the input vector. We only
want to copy information over if the output BFD also uses Elf
format. */
if (bfd_get_flavour (obfd) != bfd_target_elf_flavour)
return true;
BFD_ASSERT (!elf_flags_init (obfd)
|| elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);
elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
elf_flags_init (obfd) = true;
return true;
}
/* Merge backend specific data from an object file to the output
object file when linking */
static boolean
ppc_elf_merge_private_bfd_data (ibfd, obfd)
bfd *ibfd;
bfd *obfd;
{
flagword old_flags;
flagword new_flags;
boolean error;
/* Check if we have the same endianess */
if (ibfd->xvec->byteorder != obfd->xvec->byteorder
&& obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
{
(*_bfd_error_handler)
("%s: compiled for a %s endian system and target is %s endian",
bfd_get_filename (ibfd),
bfd_big_endian (ibfd) ? "big" : "little",
bfd_big_endian (obfd) ? "big" : "little");
bfd_set_error (bfd_error_wrong_format);
return false;
}
/* This function is selected based on the input vector. We only
want to copy information over if the output BFD also uses Elf
format. */
if (bfd_get_flavour (obfd) != bfd_target_elf_flavour)
return true;
new_flags = elf_elfheader (ibfd)->e_flags;
old_flags = elf_elfheader (obfd)->e_flags;
if (!elf_flags_init (obfd)) /* First call, no flags set */
{
elf_flags_init (obfd) = true;
elf_elfheader (obfd)->e_flags = new_flags;
}
else if (new_flags == old_flags) /* Compatible flags are ok */
;
else /* Incompatible flags */
{
/* Warn about -mrelocatable mismatch. Allow -mrelocatable-lib to be linked
with either. */
error = false;
if ((new_flags & EF_PPC_RELOCATABLE) != 0
&& (old_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0)
{
error = true;
(*_bfd_error_handler)
("%s: compiled with -mrelocatable and linked with modules compiled normally",
bfd_get_filename (ibfd));
}
else if ((new_flags & (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB)) == 0
&& (old_flags & EF_PPC_RELOCATABLE) != 0)
{
error = true;
(*_bfd_error_handler)
("%s: compiled normally and linked with modules compiled with -mrelocatable",
bfd_get_filename (ibfd));
}
else if ((new_flags & EF_PPC_RELOCATABLE_LIB) != 0)
elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE_LIB;
/* Do not warn about eabi vs. V.4 mismatch, just or in the bit if any module uses it */
elf_elfheader (obfd)->e_flags |= (new_flags & EF_PPC_EMB);
new_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
old_flags &= ~ (EF_PPC_RELOCATABLE | EF_PPC_RELOCATABLE_LIB | EF_PPC_EMB);
/* Warn about any other mismatches */
if (new_flags != old_flags)
{
error = true;
(*_bfd_error_handler)
("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
bfd_get_filename (ibfd), (long)new_flags, (long)old_flags);
}
if (error)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
}
return true;
}
/* Handle a PowerPC specific section when reading an object file. This
is called when elfcode.h finds a section with an unknown type. */
static boolean
ppc_elf_section_from_shdr (abfd, hdr, name)
bfd *abfd;
Elf32_Internal_Shdr *hdr;
char *name;
{
asection *newsect;
flagword flags;
if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
return false;
newsect = hdr->bfd_section;
flags = bfd_get_section_flags (abfd, newsect);
if (hdr->sh_flags & SHF_EXCLUDE)
flags |= SEC_EXCLUDE;
if (hdr->sh_type == SHT_ORDERED)
flags |= SEC_SORT_ENTRIES;
bfd_set_section_flags (abfd, newsect, flags);
return true;
}
/* Set up any other section flags and such that may be necessary. */
boolean
ppc_elf_fake_sections (abfd, shdr, asect)
bfd *abfd;
Elf32_Internal_Shdr *shdr;
asection *asect;
{
if ((asect->flags & SEC_EXCLUDE) != 0)
shdr->sh_flags |= SHF_EXCLUDE;
if ((asect->flags & SEC_SORT_ENTRIES) != 0)
shdr->sh_type = SHT_ORDERED;
return true;
}
/* Create a special linker section */
static elf_linker_section_t *
ppc_elf_create_linker_section (abfd, info, which)
bfd *abfd;
struct bfd_link_info *info;
enum elf_linker_section_enum which;
{
bfd *dynobj = elf_hash_table (info)->dynobj;
elf_linker_section_t *lsect;
/* Record the first bfd section that needs the special section */
if (!dynobj)
dynobj = elf_hash_table (info)->dynobj = abfd;
/* If this is the first time, create the section */
lsect = elf_linker_section (dynobj, which);
if (!lsect)
{
elf_linker_section_t defaults;
static elf_linker_section_t zero_section;
defaults = zero_section;
defaults.which = which;
defaults.hole_written_p = false;
defaults.alignment = 2;
defaults.flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
switch (which)
{
default:
(*_bfd_error_handler) ("%s: Unknown special linker type %d",
bfd_get_filename (abfd),
(int)which);
bfd_set_error (bfd_error_bad_value);
return (elf_linker_section_t *)0;
case LINKER_SECTION_GOT: /* .got section */
defaults.name = ".got";
defaults.rel_name = ".rela.got";
defaults.sym_name = "_GLOBAL_OFFSET_TABLE_";
defaults.max_hole_offset = 32764;
defaults.hole_size = 16;
defaults.sym_offset = 4;
break;
case LINKER_SECTION_PLT: /* .plt section */
defaults.name = ".plt";
defaults.rel_name = ".rela.plt";
defaults.sym_name = (char *)0;
defaults.max_hole_offset = 0;
defaults.hole_size = 0;
defaults.sym_offset = 0;
defaults.flags &= ~SEC_LOAD;
break;
case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
defaults.name = ".sdata";
defaults.rel_name = ".rela.sdata";
defaults.bss_name = ".sbss";
defaults.sym_name = "_SDA_BASE_";
defaults.sym_offset = 32768;
break;
case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
defaults.name = ".sdata2";
defaults.rel_name = ".rela.sdata2";
defaults.bss_name = ".sbss2";
defaults.sym_name = "_SDA2_BASE_";
defaults.sym_offset = 32768;
defaults.flags |= SEC_READONLY;
break;
}
lsect = _bfd_elf_create_linker_section (abfd, info, which, &defaults);
}
return lsect;
}
/* If we have a non-zero sized .sbss2 or .PPC.EMB.sbss0 sections, we need to bump up
the number of section headers. */
static int
ppc_elf_additional_program_headers (abfd)
bfd *abfd;
{
asection *s;
int ret;
ret = 0;
s = bfd_get_section_by_name (abfd, ".interp");
if (s != NULL)
++ret;
s = bfd_get_section_by_name (abfd, ".sbss2");
if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
++ret;
s = bfd_get_section_by_name (abfd, ".PPC.EMB.sbss0");
if (s != NULL && (s->flags & SEC_LOAD) != 0 && s->_raw_size > 0)
++ret;
return ret;
}
/* Modify the segment map if needed */
static boolean
ppc_elf_modify_segment_map (abfd)
bfd *abfd;
{
return true;
}
/* Adjust a symbol defined by a dynamic object and referenced by a
regular object. The current definition is in some section of the
dynamic object, but we're not including those sections. We have to
change the definition to something the rest of the link can
understand. */
static boolean
ppc_elf_adjust_dynamic_symbol (info, h)
struct bfd_link_info *info;
struct elf_link_hash_entry *h;
{
bfd *dynobj = elf_hash_table (info)->dynobj;
asection *s;
unsigned int power_of_two;
bfd_vma plt_offset;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_adjust_dynamic_symbol called for %s\n", h->root.root.string);
#endif
/* Make sure we know what is going on here. */
BFD_ASSERT (dynobj != NULL
&& ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
|| h->weakdef != NULL
|| ((h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR) != 0
&& (h->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR) == 0)));
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later,
when we know the address of the .got section. */
if (h->type == STT_FUNC
|| (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
{
if (! info->shared
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
&& (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0)
{
/* This case can occur if we saw a PLT32 reloc in an input
file, but the symbol was never referred to by a dynamic
object. In such a case, we don't actually need to build
a procedure linkage table, and we can just do a PC32
reloc instead. */
BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
return true;
}
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
return false;
}
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
/* If this is the first .plt entry, make room for the special
first entry. */
if (s->_raw_size == 0)
s->_raw_size += PLT_INITIAL_ENTRY_SIZE;
/* The PowerPC PLT is actually composed of two parts, the first part
is 2 words (for a load and a jump), and then there is a remaining
word available at the end. */
plt_offset = (PLT_INITIAL_ENTRY_SIZE
+ 8 * ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE));
/* If this symbol is not defined in a regular file, and we are
not generating a shared library, then set the symbol to this
location in the .plt. This is required to make function
pointers compare as equal between the normal executable and
the shared library. */
if (! info->shared
&& (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
{
h->root.u.def.section = s;
h->root.u.def.value = plt_offset;
}
h->plt_offset = plt_offset;
/* Make room for this entry. */
s->_raw_size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .rela.plt section. */
s = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf32_External_Rela);
return true;
}
/* If this is a weak symbol, and there is a real definition, the
processor independent code will have arranged for us to see the
real definition first, and we can just use the same value. */
if (h->weakdef != NULL)
{
BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
|| h->weakdef->root.type == bfd_link_hash_defweak);
h->root.u.def.section = h->weakdef->root.u.def.section;
h->root.u.def.value = h->weakdef->root.u.def.value;
return true;
}
/* This is a reference to a symbol defined by a dynamic object which
is not a function. */
/* If we are creating a shared library, we must presume that the
only references to the symbol are via the global offset table.
For such cases we need not do anything here; the relocations will
be handled correctly by relocate_section. */
if (info->shared)
return true;
/* We must allocate the symbol in our .dynbss section, which will
become part of the .bss section of the executable. There will be
an entry for this symbol in the .dynsym section. The dynamic
object will contain position independent code, so all references
from the dynamic object to this symbol will go through the global
offset table. The dynamic linker will use the .dynsym entry to
determine the address it must put in the global offset table, so
both the dynamic object and the regular object will refer to the
same memory location for the variable. */
s = bfd_get_section_by_name (dynobj, ".dynbss");
BFD_ASSERT (s != NULL);
/* If the symbol is currently defined in the .bss section of the
dynamic object, then it is OK to simply initialize it to zero.
If the symbol is in some other section, we must generate a
R_386_COPY reloc to tell the dynamic linker to copy the initial
value out of the dynamic object and into the runtime process
image. We need to remember the offset into the .rela.bss section
we are going to use. */
if ((h->root.u.def.section->flags & SEC_LOAD) != 0)
{
asection *srel;
srel = bfd_get_section_by_name (dynobj, ".rela.bss");
BFD_ASSERT (srel != NULL);
srel->_raw_size += sizeof (Elf32_External_Rel);
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
}
/* We need to figure out the alignment required for this symbol. I
have no idea how ELF linkers handle this. */
power_of_two = bfd_log2 (h->size);
if (power_of_two > 3)
power_of_two = 3;
/* Apply the required alignment. */
s->_raw_size = BFD_ALIGN (s->_raw_size,
(bfd_size_type) (1 << power_of_two));
if (power_of_two > bfd_get_section_alignment (dynobj, s))
{
if (! bfd_set_section_alignment (dynobj, s, power_of_two))
return false;
}
/* Define the symbol as being at this point in the section. */
h->root.u.def.section = s;
h->root.u.def.value = s->_raw_size;
/* Increment the section size to make room for the symbol. */
s->_raw_size += h->size;
return true;
}
/* Increment the index of a dynamic symbol by a given amount. Called
via elf_link_hash_traverse. */
static boolean
ppc_elf_adjust_dynindx (h, cparg)
struct elf_link_hash_entry *h;
PTR cparg;
{
int *cp = (int *) cparg;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_adjust_dynindx called, h->dynindx = %d, *cp = %d\n", h->dynindx, *cp);
#endif
if (h->dynindx != -1)
h->dynindx += *cp;
return true;
}
/* Set the sizes of the dynamic sections. */
static boolean
ppc_elf_size_dynamic_sections (output_bfd, info)
bfd *output_bfd;
struct bfd_link_info *info;
{
bfd *dynobj;
asection *s;
boolean plt;
boolean relocs;
boolean reltext;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_size_dynamic_sections called\n");
#endif
dynobj = elf_hash_table (info)->dynobj;
BFD_ASSERT (dynobj != NULL);
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
if (! info->shared)
{
s = bfd_get_section_by_name (dynobj, ".interp");
BFD_ASSERT (s != NULL);
s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
}
/* Make space for the trailing nop in .plt. */
s = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (s != NULL);
if (s->_raw_size > 0)
s->_raw_size += 4;
}
else
{
/* We may have created entries in the .rela.got, .rela.sdata, and
.rela.sdata2 section2. However, if we are not creating the
dynamic sections, we will not actually use these entries. Reset
the size of .rela.got, et al, which will cause it to get
stripped from the output file below. */
static char *rela_sections[] = { ".rela.got", ".rela.sdata", ".rela.sdata", (char *)0 };
char **p;
for (p = rela_sections; *p != (char *)0; p++)
{
s = bfd_get_section_by_name (dynobj, *p);
if (s != NULL)
s->_raw_size = 0;
}
}
/* The check_relocs and adjust_dynamic_symbol entry points have
determined the sizes of the various dynamic sections. Allocate
memory for them. */
plt = false;
relocs = false;
reltext = false;
for (s = dynobj->sections; s != NULL; s = s->next)
{
const char *name;
boolean strip;
if ((s->flags & SEC_IN_MEMORY) == 0)
continue;
/* It's OK to base decisions on the section name, because none
of the dynobj section names depend upon the input files. */
name = bfd_get_section_name (dynobj, s);
strip = false;
if (strcmp (name, ".plt") == 0)
{
if (s->_raw_size == 0)
{
/* Strip this section if we don't need it; see the
comment below. */
strip = true;
}
else
{
/* Remember whether there is a PLT. */
plt = true;
}
}
else if (strncmp (name, ".rela", 5) == 0)
{
if (s->_raw_size == 0)
{
/* If we don't need this section, strip it from the
output file. This is mostly to handle .rela.bss and
.rela.plt. We must create both sections in
create_dynamic_sections, because they must be created
before the linker maps input sections to output
sections. The linker does that before
adjust_dynamic_symbol is called, and it is that
function which decides whether anything needs to go
into these sections. */
strip = true;
}
else
{
asection *target;
/* Remember whether there are any reloc sections other
than .rel.plt. */
if (strcmp (name, ".rela.plt") != 0)
{
relocs = true;
/* If this relocation section applies to a read only
section, then we probably need a DT_TEXTREL
entry. The entries in the .rel.plt section
really apply to the .got section, which we
created ourselves and so know is not readonly. */
target = bfd_get_section_by_name (output_bfd, name + 4);
if (target != NULL
&& (target->flags & SEC_READONLY) != 0)
reltext = true;
}
/* We use the reloc_count field as a counter if we need
to copy relocs into the output file. */
s->reloc_count = 0;
}
}
else if (strcmp (name, ".got") != 0
&& strcmp (name, ".sdata") != 0
&& strcmp (name, ".sdata2") != 0)
{
/* It's not one of our sections, so don't allocate space. */
continue;
}
if (strip)
{
asection **spp;
for (spp = &s->output_section->owner->sections;
*spp != s->output_section;
spp = &(*spp)->next)
;
*spp = s->output_section->next;
--s->output_section->owner->section_count;
continue;
}
/* Allocate memory for the section contents. */
s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
if (s->contents == NULL && s->_raw_size != 0)
return false;
}
if (elf_hash_table (info)->dynamic_sections_created)
{
/* Add some entries to the .dynamic section. We fill in the
values later, in ppc_elf_finish_dynamic_sections, but we
must add the entries now so that we get the correct size for
the .dynamic section. The DT_DEBUG entry is filled in by the
dynamic linker and used by the debugger. */
if (! info->shared)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
return false;
}
if (plt)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL)
|| ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
return false;
}
if (relocs)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELASZ, DT_RELA)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELENT,
sizeof (Elf32_External_Rela)))
return false;
}
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
return false;
}
}
/* If we are generating a shared library, we generate a section
symbol for each output section. These are local symbols, which
means that they must come first in the dynamic symbol table.
That means we must increment the dynamic symbol index of every
other dynamic symbol. */
if (info->shared)
{
int c, i;
c = bfd_count_sections (output_bfd);
elf_link_hash_traverse (elf_hash_table (info),
ppc_elf_adjust_dynindx,
(PTR) &c);
elf_hash_table (info)->dynsymcount += c;
for (i = 1, s = output_bfd->sections; s != NULL; s = s->next, i++)
{
elf_section_data (s)->dynindx = i;
/* These symbols will have no names, so we don't need to
fiddle with dynstr_index. */
}
}
return true;
}
/* Look through the relocs for a section during the first phase, and
allocate space in the global offset table or procedure linkage
table. */
static boolean
ppc_elf_check_relocs (abfd, info, sec, relocs)
bfd *abfd;
struct bfd_link_info *info;
asection *sec;
const Elf_Internal_Rela *relocs;
{
boolean ret = true;
bfd *dynobj;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
elf_linker_section_t *got;
elf_linker_section_t *plt;
elf_linker_section_t *sdata;
elf_linker_section_t *sdata2;
asection *sreloc;
if (info->relocateable)
return true;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_check_relocs called for section %s in %s\n",
bfd_get_section_name (abfd, sec),
bfd_get_filename (abfd));
#endif
/* Create the linker generated sections all the time so that the special
symbols are created. */
if ((got = elf_linker_section (abfd, LINKER_SECTION_GOT)) == NULL)
{
got = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_GOT);
if (!got)
ret = false;
}
#if 0
if ((plt = elf_linker_section (abfd, LINKER_SECTION_PLT)) == NULL)
{
plt = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_PLT);
if (!plt)
ret = false;
}
#endif
if ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
{
sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
if (!sdata)
ret = false;
}
if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
{
sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
if (!sdata2)
ret = false;
}
dynobj = elf_hash_table (info)->dynobj;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
unsigned long r_symndx;
struct elf_link_hash_entry *h;
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx < symtab_hdr->sh_info)
h = NULL;
else
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
switch (ELF32_R_TYPE (rel->r_info))
{
/* GOT16 relocations */
case R_PPC_GOT16:
case R_PPC_GOT16_LO:
case R_PPC_GOT16_HI:
case R_PPC_GOT16_HA:
if (got->rel_section == NULL
&& (h != NULL || info->shared)
&& !_bfd_elf_make_linker_section_rela (dynobj, got, 2))
{
ret = false;
break;
}
if (!bfd_elf32_create_pointer_linker_section (abfd, info, got, h, rel))
ret = false;
break;
/* Indirect .sdata relocation */
case R_PPC_EMB_SDAI16:
if (info->shared)
{
(*_bfd_error_handler) ("%s: relocation %s cannot be used when making a shared object",
bfd_get_filename (abfd),
"R_PPC_EMB_SDAI16");
ret = false;
break;
}
if (got->rel_section == NULL
&& (h != NULL || info->shared)
&& !_bfd_elf_make_linker_section_rela (dynobj, got, 2))
{
ret = false;
break;
}
if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
ret = false;
break;
/* Indirect .sdata2 relocation */
case R_PPC_EMB_SDA2I16:
if (info->shared)
{
(*_bfd_error_handler) ("%s: relocation %s cannot be used when making a shared object",
bfd_get_filename (abfd),
"R_PPC_EMB_SDA2I16");
ret = false;
break;
}
if (got->rel_section == NULL
&& (h != NULL || info->shared)
&& !_bfd_elf_make_linker_section_rela (dynobj, got, 2))
return false;
if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata2, h, rel))
return false;
break;
case R_PPC_SDAREL16:
case R_PPC_EMB_SDA2REL:
case R_PPC_EMB_SDA21:
if (info->shared)
{
(*_bfd_error_handler) ("%s: relocation %s cannot be used when making a shared object",
bfd_get_filename (abfd),
ppc_elf_howto_table[(int)ELF32_R_TYPE (rel->r_info)]->name);
ret = false;
}
break;
case R_PPC_PLT32:
case R_PPC_PLTREL24:
case R_PPC_PLT16_LO:
case R_PPC_PLT16_HI:
case R_PPC_PLT16_HA:
#ifdef DEBUG
fprintf (stderr, "Reloc requires a PLT entry\n");
#endif
/* This symbol requires a procedure linkage table entry. We
actually build the entry in adjust_dynamic_symbol,
because this might be a case of linking PIC code without
linking in any dynamic objects, in which case we don't
need to generate a procedure linkage table after all. */
if (h == NULL)
{
/* It does not make sense to have a procedure linkage
table entry for a local symbol. */
bfd_set_error (bfd_error_bad_value);
ret = false;
break;
}
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
if (! bfd_elf32_link_record_dynamic_symbol (info, h))
{
ret = false;
break;
}
}
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
break;
/* the following relocations don't need to propigate the relocation if
linking a shared object since they are section relative. */
case R_PPC_SECTOFF:
case R_PPC_SECTOFF_LO:
case R_PPC_SECTOFF_HI:
case R_PPC_SECTOFF_HA:
break;
/* When creating a shared object, we must copy these
relocs into the output file. We create a reloc
section in dynobj and make room for the reloc. */
case R_PPC_REL24:
if (h != NULL
&& strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
break;
/* fall through */
case R_PPC_REL14:
case R_PPC_REL14_BRTAKEN:
case R_PPC_REL14_BRNTAKEN:
if (h == NULL)
break;
/* fall through */
default:
if (info->shared
&& (sec->flags & SEC_ALLOC) != 0)
{
if (sreloc == NULL)
{
const char *name;
name = (bfd_elf_string_from_elf_section
(abfd,
elf_elfheader (abfd)->e_shstrndx,
elf_section_data (sec)->rel_hdr.sh_name));
if (name == NULL)
{
ret = false;
break;
}
BFD_ASSERT (strncmp (name, ".rela", 5) == 0
&& strcmp (bfd_get_section_name (abfd, sec),
name + 5) == 0);
sreloc = bfd_get_section_by_name (dynobj, name);
if (sreloc == NULL)
{
sreloc = bfd_make_section (dynobj, name);
if (sreloc == NULL
|| ! bfd_set_section_flags (dynobj, sreloc,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_READONLY))
|| ! bfd_set_section_alignment (dynobj, sreloc, 2))
{
ret = false;
break;
}
}
}
sreloc->_raw_size += sizeof (Elf32_External_Rela);
}
break;
}
}
return ret;
}
/* Hook called by the linker routine which adds symbols from an object
file. We use it to put .comm items in .sbss, and not .bss. */
/*ARGSUSED*/
static boolean
ppc_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp)
bfd *abfd;
struct bfd_link_info *info;
const Elf_Internal_Sym *sym;
const char **namep;
flagword *flagsp;
asection **secp;
bfd_vma *valp;
{
if (sym->st_shndx == SHN_COMMON && !info->relocateable && sym->st_size <= bfd_get_gp_size (abfd))
{
/* Common symbols less than or equal to -G nn bytes are automatically
put into .sdata. */
elf_linker_section_t *sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
if (!sdata->bss_section)
{
sdata->bss_section = bfd_make_section (elf_hash_table (info)->dynobj, sdata->bss_name);
sdata->bss_section->flags = (sdata->bss_section->flags & ~SEC_LOAD) | SEC_IS_COMMON;
}
*secp = sdata->bss_section;
*valp = sym->st_size;
}
return true;
}
/* Finish up dynamic symbol handling. We set the contents of various
dynamic sections here. */
static boolean
ppc_elf_finish_dynamic_symbol (output_bfd, info, h, sym)
bfd *output_bfd;
struct bfd_link_info *info;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
{
bfd *dynobj;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_finish_dynamic_symbol called for %s", h->root.root.string);
#endif
dynobj = elf_hash_table (info)->dynobj;
BFD_ASSERT (dynobj != NULL);
if (h->plt_offset != (bfd_vma) -1)
{
asection *splt;
asection *srela;
Elf_Internal_Rela rela;
#ifdef DEBUG
fprintf (stderr, ", plt_offset = %d", h->plt_offset);
#endif
/* This symbol has an entry in the procedure linkage table. Set
it up. */
BFD_ASSERT (h->dynindx != -1);
splt = bfd_get_section_by_name (dynobj, ".plt");
srela = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (splt != NULL && srela != NULL);
/* We don't need to fill in the .plt. The solaris dynamic linker will
fill it in. */
/* Fill in the entry in the .rela.plt section. */
rela.r_offset = (splt->output_section->vma
+ splt->output_offset
+ h->plt_offset);
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_JMP_SLOT);
rela.r_addend = 0;
bfd_elf32_swap_reloca_out (output_bfd, &rela,
((Elf32_External_Rela *) srela->contents
+ ((h->plt_offset - PLT_INITIAL_ENTRY_SIZE) / 8)));
if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
{
/* Mark the symbol as undefined, rather than as defined in
the .plt section. Leave the value alone. */
sym->st_shndx = SHN_UNDEF;
}
}
if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
{
asection *s;
Elf_Internal_Rela rela;
/* This symbols needs a copy reloc. Set it up. */
#ifdef DEBUG
fprintf (stderr, ", copy");
#endif
BFD_ASSERT (h->dynindx != -1);
s = bfd_get_section_by_name (h->root.u.def.section->owner,
".rela.bss");
BFD_ASSERT (s != NULL);
rela.r_offset = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_COPY);
rela.r_addend = 0;
bfd_elf32_swap_reloca_out (output_bfd, &rela,
((Elf32_External_Rela *) s->contents
+ s->reloc_count));
++s->reloc_count;
}
#ifdef DEBUG
fprintf (stderr, "\n");
#endif
/* Mark some specially defined symbols as absolute. */
if (strcmp (h->root.root.string, "_DYNAMIC") == 0
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|| strcmp (h->root.root.string, "_PROCEDURE_LINKAGE_TABLE_") == 0)
sym->st_shndx = SHN_ABS;
return true;
}
/* Finish up the dynamic sections. */
static boolean
ppc_elf_finish_dynamic_sections (output_bfd, info)
bfd *output_bfd;
struct bfd_link_info *info;
{
asection *sdyn;
bfd *dynobj = elf_hash_table (info)->dynobj;
elf_linker_section_t *got = elf_linker_section (dynobj, LINKER_SECTION_GOT);
#ifdef DEBUG
fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
#endif
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
if (elf_hash_table (info)->dynamic_sections_created)
{
asection *splt;
Elf32_External_Dyn *dyncon, *dynconend;
splt = bfd_get_section_by_name (dynobj, ".plt");
BFD_ASSERT (splt != NULL && sdyn != NULL);
dyncon = (Elf32_External_Dyn *) sdyn->contents;
dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
for (; dyncon < dynconend; dyncon++)
{
Elf_Internal_Dyn dyn;
const char *name;
boolean size;
bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
switch (dyn.d_tag)
{
case DT_PLTGOT: name = ".plt"; size = false; break;
case DT_PLTRELSZ: name = ".rela.plt"; size = true; break;
case DT_JMPREL: name = ".rela.plt"; size = false; break;
default: name = NULL; size = false; break;
}
if (name != NULL)
{
asection *s;
s = bfd_get_section_by_name (output_bfd, name);
if (s == NULL)
dyn.d_un.d_val = 0;
else
{
if (! size)
dyn.d_un.d_ptr = s->vma;
else
{
if (s->_cooked_size != 0)
dyn.d_un.d_val = s->_cooked_size;
else
dyn.d_un.d_val = s->_raw_size;
}
}
bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
}
}
}
/* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
easily find the address of the _GLOBAL_OFFSET_TABLE_. */
if (got)
{
unsigned char *contents = got->section->contents + got->hole_offset;
bfd_put_32 (output_bfd, 0x4e800021 /* blrl */, contents);
if (sdyn == NULL)
bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
else
bfd_put_32 (output_bfd,
sdyn->output_section->vma + sdyn->output_offset,
contents+4);
elf_section_data (got->section->output_section)->this_hdr.sh_entsize = 4;
}
if (info->shared)
{
asection *sdynsym;
asection *s;
Elf_Internal_Sym sym;
/* Set up the section symbols for the output sections. */
sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
BFD_ASSERT (sdynsym != NULL);
sym.st_size = 0;
sym.st_name = 0;
sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
sym.st_other = 0;
for (s = output_bfd->sections; s != NULL; s = s->next)
{
int indx;
sym.st_value = s->vma;
indx = elf_section_data (s)->this_idx;
BFD_ASSERT (indx > 0);
sym.st_shndx = indx;
bfd_elf32_swap_symbol_out (output_bfd, &sym,
(PTR) (((Elf32_External_Sym *)
sdynsym->contents)
+ elf_section_data (s)->dynindx));
}
/* Set the sh_info field of the output .dynsym section to the
index of the first global symbol. */
elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
bfd_count_sections (output_bfd) + 1;
}
return true;
}
/* The RELOCATE_SECTION function is called by the ELF backend linker
to handle the relocations for a section.
The relocs are always passed as Rela structures; if the section
actually uses Rel structures, the r_addend field will always be
zero.
This function is responsible for adjust the section contents as
necessary, and (if using Rela relocs and generating a
relocateable output file) adjusting the reloc addend as
necessary.
This function does not have to worry about setting the reloc
address or the reloc symbol index.
LOCAL_SYMS is a pointer to the swapped in local symbols.
LOCAL_SECTIONS is an array giving the section in the input file
corresponding to the st_shndx field of each local symbol.
The global hash table entry for the global symbols can be found
via elf_sym_hashes (input_bfd).
When generating relocateable output, this function must handle
STB_LOCAL/STT_SECTION symbols specially. The output symbol is
going to be the section symbol corresponding to the output
section, which means that the addend must be adjusted
accordingly. */
static boolean
ppc_elf_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, local_syms, local_sections)
bfd *output_bfd;
struct bfd_link_info *info;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
Elf_Internal_Rela *relocs;
Elf_Internal_Sym *local_syms;
asection **local_sections;
{
Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
bfd *dynobj = elf_hash_table (info)->dynobj;
elf_linker_section_t *got = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_GOT) : NULL;
elf_linker_section_t *sdata = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA) : NULL;
elf_linker_section_t *sdata2 = (dynobj) ? elf_linker_section (dynobj, LINKER_SECTION_SDATA2) : NULL;
Elf_Internal_Rela *rel = relocs;
Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
boolean ret = true;
long insn;
#ifdef DEBUG
fprintf (stderr, "ppc_elf_relocate_section called for %s section %s, %ld relocations%s\n",
bfd_get_filename (input_bfd),
bfd_section_name(input_bfd, input_section),
(long)input_section->reloc_count,
(info->relocateable) ? " (relocatable)" : "");
#endif
if (!ppc_elf_howto_table[ R_PPC_ADDR32 ]) /* Initialize howto table if needed */
ppc_elf_howto_init ();
for (; rel < relend; rel++)
{
enum ppc_reloc_type r_type = (enum ppc_reloc_type)ELF32_R_TYPE (rel->r_info);
bfd_vma offset = rel->r_offset;
bfd_vma addend = rel->r_addend;
bfd_reloc_status_type r = bfd_reloc_other;
Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
asection *sec = (asection *)0;
struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
const char *sym_name = (const char *)0;
reloc_howto_type *howto;
unsigned long r_symndx;
bfd_vma relocation;
/* Unknown relocation handling */
if ((unsigned)r_type >= (unsigned)R_PPC_max || !ppc_elf_howto_table[(int)r_type])
{
(*_bfd_error_handler) ("%s: unknown relocation type %d",
bfd_get_filename (input_bfd),
(int)r_type);
bfd_set_error (bfd_error_bad_value);
ret = false;
continue;
}
howto = ppc_elf_howto_table[(int)r_type];
r_symndx = ELF32_R_SYM (rel->r_info);
if (info->relocateable)
{
/* This is a relocateable link. We don't have to change
anything, unless the reloc is against a section symbol,
in which case we have to adjust according to where the
section symbol winds up in the output section. */
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
sec = local_sections[r_symndx];
addend = rel->r_addend += sec->output_offset + sym->st_value;
}
}
#ifdef DEBUG
fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
howto->name,
(int)r_type,
r_symndx,
(long)offset,
(long)addend);
#endif
continue;
}
/* This is a final link. */
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
sym_name = "<local symbol>";
relocation = (sec->output_section->vma
+ sec->output_offset
+ sym->st_value);
}
else
{
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
while (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning)
h = (struct elf_link_hash_entry *) h->root.u.i.link;
sym_name = h->root.root.string;
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
sec = h->root.u.def.section;
if (!sec || !sec->output_section)
{
(*_bfd_error_handler) ("%s: Section in shared library for symbol %s\n",
bfd_get_filename (input_bfd),
sym_name);
relocation = 0;
}
else
relocation = (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset);
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
else if (info->shared)
relocation = 0;
else
{
(*info->callbacks->undefined_symbol)(info,
h->root.root.string,
input_bfd,
input_section,
rel->r_offset);
ret = false;
continue;
}
}
switch ((int)r_type)
{
default:
(*_bfd_error_handler) ("%s: unknown relocation type %d for symbol %s",
bfd_get_filename (input_bfd),
(int)r_type, sym_name);
bfd_set_error (bfd_error_bad_value);
ret = false;
continue;
/* relocations that need no special processing */
case (int)R_PPC_NONE:
case (int)R_PPC_ADDR32:
case (int)R_PPC_ADDR24:
case (int)R_PPC_ADDR16:
case (int)R_PPC_ADDR16_LO:
case (int)R_PPC_ADDR16_HI:
case (int)R_PPC_ADDR14:
case (int)R_PPC_REL24:
case (int)R_PPC_REL14:
case (int)R_PPC_UADDR32:
case (int)R_PPC_UADDR16:
case (int)R_PPC_REL32:
break;
/* branch taken prediction relocations */
case (int)R_PPC_ADDR14_BRTAKEN:
case (int)R_PPC_REL14_BRTAKEN:
insn = bfd_get_32 (output_bfd, contents + offset);
if ((relocation - offset) & 0x8000)
insn &= ~BRANCH_PREDICT_BIT;
else
insn |= BRANCH_PREDICT_BIT;
bfd_put_32 (output_bfd, insn, contents + offset);
break;
/* branch not taken predicition relocations */
case (int)R_PPC_ADDR14_BRNTAKEN:
case (int)R_PPC_REL14_BRNTAKEN:
insn = bfd_get_32 (output_bfd, contents + offset);
if ((relocation - offset) & 0x8000)
insn |= BRANCH_PREDICT_BIT;
else
insn &= ~BRANCH_PREDICT_BIT;
bfd_put_32 (output_bfd, insn, contents + offset);
break;
/* GOT16 relocations */
case (int)R_PPC_GOT16:
case (int)R_PPC_GOT16_LO:
case (int)R_PPC_GOT16_HI:
case (int)R_PPC_GOT16_HA:
relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
got, h, relocation, rel,
R_PPC_RELATIVE);
break;
/* Indirect .sdata relocation */
case (int)R_PPC_EMB_SDAI16:
BFD_ASSERT (sdata != NULL);
relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
sdata, h, relocation, rel,
R_PPC_RELATIVE);
break;
/* Indirect .sdata2 relocation */
case (int)R_PPC_EMB_SDA2I16:
BFD_ASSERT (sdata2 != NULL);
relocation = bfd_elf32_finish_pointer_linker_section (output_bfd, input_bfd, info,
sdata2, h, relocation, rel,
R_PPC_RELATIVE);
break;
/* Handle the TOC16 reloc. We want to use the offset within the .got
section, not the actual VMA. This is appropriate when generating
an embedded ELF object, for which the .got section acts like the
AIX .toc section. */
case (int)R_PPC_TOC16: /* phony GOT16 relocations */
BFD_ASSERT (sec != (asection *)0);
BFD_ASSERT (bfd_is_und_section (sec)
|| strcmp (bfd_get_section_name (abfd, sec), ".got") == 0
|| strcmp (bfd_get_section_name (abfd, sec), ".cgot") == 0)
addend -= sec->output_section->vma + sec->output_offset + 0x8000;
break;
/* arithmetic adjust relocations */
case (int)R_PPC_ADDR16_HA:
BFD_ASSERT (sec != (asection *)0);
addend += ((relocation + addend) & 0x8000) << 1;
break;
/* relocate against _SDA_BASE_ */
case (int)R_PPC_SDAREL16:
BFD_ASSERT (sec != (asection *)0);
if (strcmp (bfd_get_section_name (abfd, sec), ".sdata") != 0
&& strcmp (bfd_get_section_name (abfd, sec), ".sbss") != 0)
{
(*_bfd_error_handler) ("%s: The target (%s) of a %s relocation is in the wrong section (%s)",
bfd_get_filename (input_bfd),
sym_name,
ppc_elf_howto_table[ (int)r_type ]->name,
bfd_get_section_name (abfd, sec));
bfd_set_error (bfd_error_bad_value);
ret = false;
continue;
}
addend -= (sdata->sym_hash->root.u.def.value
+ sdata->sym_hash->root.u.def.section->output_section->vma
+ sdata->sym_hash->root.u.def.section->output_offset);
break;
/* relocate against _SDA2_BASE_ */
case (int)R_PPC_EMB_SDA2REL:
BFD_ASSERT (sec != (asection *)0);
if (strcmp (bfd_get_section_name (abfd, sec), ".sdata2") != 0
&& strcmp (bfd_get_section_name (abfd, sec), ".sbss2") != 0)
{
(*_bfd_error_handler) ("%s: The target (%s) of a %s relocation is in the wrong section (%s)",
bfd_get_filename (input_bfd),
sym_name,
ppc_elf_howto_table[ (int)r_type ]->name,
bfd_get_section_name (abfd, sec));
bfd_set_error (bfd_error_bad_value);
ret = false;
continue;
}
addend -= (sdata2->sym_hash->root.u.def.value
+ sdata2->sym_hash->root.u.def.section->output_section->vma
+ sdata2->sym_hash->root.u.def.section->output_offset);
break;
/* relocate against either _SDA_BASE_, _SDA2_BASE_, or 0 */
case (int)R_PPC_EMB_SDA21:
case (int)R_PPC_EMB_RELSDA:
{
const char *name = bfd_get_section_name (abfd, sec);
int reg;
BFD_ASSERT (sec != (asection *)0);
if (strcmp (name, ".sdata") == 0 || strcmp (name, ".sbss") == 0)
{
reg = 13;
addend -= (sdata->sym_hash->root.u.def.value
+ sdata->sym_hash->root.u.def.section->output_section->vma
+ sdata->sym_hash->root.u.def.section->output_offset);
}
else if (strcmp (name, ".sdata2") == 0 || strcmp (name, ".sbss2") == 0)
{
reg = 2;
addend -= (sdata2->sym_hash->root.u.def.value
+ sdata2->sym_hash->root.u.def.section->output_section->vma
+ sdata2->sym_hash->root.u.def.section->output_offset);
}
else if (strcmp (name, ".PPC.EMB.sdata0") == 0 || strcmp (name, ".PPC.EMB.sbss0") == 0)
{
reg = 0;
}
else
{
(*_bfd_error_handler) ("%s: The target (%s) of a %s relocation is in the wrong section (%s)",
bfd_get_filename (input_bfd),
sym_name,
ppc_elf_howto_table[ (int)r_type ]->name,
bfd_get_section_name (abfd, sec));
bfd_set_error (bfd_error_bad_value);
ret = false;
continue;
}
if (r_type == R_PPC_EMB_SDA21)
{ /* fill in register field */
insn = bfd_get_32 (output_bfd, contents + offset);
insn = (insn & ~RA_REGISTER_MASK) | (reg << RA_REGISTER_SHIFT);
bfd_put_32 (output_bfd, insn, contents + offset);
}
}
break;
/* Relocate against the beginning of the section */
case (int)R_PPC_SECTOFF:
case (int)R_PPC_SECTOFF_LO:
case (int)R_PPC_SECTOFF_HI:
BFD_ASSERT (sec != (asection *)0);
addend -= sec->output_section->vma;
break;
case (int)R_PPC_SECTOFF_HA:
BFD_ASSERT (sec != (asection *)0);
addend -= sec->output_section->vma;
addend += ((relocation + addend) & 0x8000) << 1;
break;
/* Negative relocations */
case (int)R_PPC_EMB_NADDR32:
case (int)R_PPC_EMB_NADDR16:
case (int)R_PPC_EMB_NADDR16_LO:
case (int)R_PPC_EMB_NADDR16_HI:
addend -= 2*relocation;
break;
case (int)R_PPC_EMB_NADDR16_HA:
addend -= 2*relocation;
addend += ((relocation + addend) & 0x8000) << 1;
break;
/* NOP relocation that prevents garbage collecting linkers from omitting a
reference. */
case (int)R_PPC_EMB_MRKREF:
continue;
case (int)R_PPC_PLTREL24:
case (int)R_PPC_COPY:
case (int)R_PPC_GLOB_DAT:
case (int)R_PPC_JMP_SLOT:
case (int)R_PPC_RELATIVE:
case (int)R_PPC_LOCAL24PC:
case (int)R_PPC_PLT32:
case (int)R_PPC_PLTREL32:
case (int)R_PPC_PLT16_LO:
case (int)R_PPC_PLT16_HI:
case (int)R_PPC_PLT16_HA:
case (int)R_PPC_EMB_RELSEC16:
case (int)R_PPC_EMB_RELST_LO:
case (int)R_PPC_EMB_RELST_HI:
case (int)R_PPC_EMB_RELST_HA:
case (int)R_PPC_EMB_BIT_FLD:
(*_bfd_error_handler) ("%s: Relocation %s is not yet supported for symbol %s.",
bfd_get_filename (input_bfd),
ppc_elf_howto_table[ (int)r_type ]->name,
sym_name);
bfd_set_error (bfd_error_invalid_operation);
ret = false;
continue;
}
#ifdef DEBUG
fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
howto->name,
(int)r_type,
sym_name,
r_symndx,
(long)offset,
(long)addend);
#endif
r = _bfd_final_link_relocate (howto,
input_bfd,
input_section,
contents,
offset,
relocation,
addend);
if (r != bfd_reloc_ok)
{
ret = false;
switch (r)
{
default:
break;
case bfd_reloc_overflow:
{
const char *name;
if (h != NULL)
name = h->root.root.string;
else
{
name = bfd_elf_string_from_elf_section (input_bfd,
symtab_hdr->sh_link,
sym->st_name);
if (name == NULL)
break;
if (*name == '\0')
name = bfd_section_name (input_bfd, sec);
}
(*info->callbacks->reloc_overflow)(info,
name,
howto->name,
(bfd_vma) 0,
input_bfd,
input_section,
offset);
}
break;
}
}
}
#ifdef DEBUG
fprintf (stderr, "\n");
#endif
return ret;
}
#define TARGET_LITTLE_SYM bfd_elf32_powerpcle_vec
#define TARGET_LITTLE_NAME "elf32-powerpcle"
#define TARGET_BIG_SYM bfd_elf32_powerpc_vec
#define TARGET_BIG_NAME "elf32-powerpc"
#define ELF_ARCH bfd_arch_powerpc
#define ELF_MACHINE_CODE EM_PPC
#define ELF_MAXPAGESIZE 0x10000
#define elf_info_to_howto ppc_elf_info_to_howto
#ifdef EM_CYGNUS_POWERPC
#define ELF_MACHINE_ALT1 EM_CYGNUS_POWERPC
#endif
#ifdef EM_PPC_OLD
#define ELF_MACHINE_ALT2 EM_PPC_OLD
#endif
#define bfd_elf32_bfd_copy_private_bfd_data ppc_elf_copy_private_bfd_data
#define bfd_elf32_bfd_merge_private_bfd_data ppc_elf_merge_private_bfd_data
#define bfd_elf32_bfd_set_private_flags ppc_elf_set_private_flags
#define bfd_elf32_bfd_reloc_type_lookup ppc_elf_reloc_type_lookup
#define elf_backend_section_from_shdr ppc_elf_section_from_shdr
#define elf_backend_relocate_section ppc_elf_relocate_section
#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
#define elf_backend_check_relocs ppc_elf_check_relocs
#define elf_backend_adjust_dynamic_symbol ppc_elf_adjust_dynamic_symbol
#define elf_backend_add_symbol_hook ppc_elf_add_symbol_hook
#define elf_backend_size_dynamic_sections ppc_elf_size_dynamic_sections
#define elf_backend_finish_dynamic_symbol ppc_elf_finish_dynamic_symbol
#define elf_backend_finish_dynamic_sections ppc_elf_finish_dynamic_sections
#define elf_backend_fake_sections ppc_elf_fake_sections
#define elf_backend_additional_program_headers ppc_elf_additional_program_headers
#define elf_backend_modify_segment_map ppc_elf_modify_segment_map
#include "elf32-target.h"
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