blob: ab803f44f445daf59808180c724c6e23dc151477 [file] [log] [blame]
/* PowerPC-specific support for 32-bit ELF
Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
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 */
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 bfd_reloc_status_type ppc_elf_addr16_ha_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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_create_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean ppc_elf_section_from_shdr PARAMS ((bfd *,
Elf32_Internal_Shdr *,
char *));
static boolean ppc_elf_fake_sections
PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
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 asection * ppc_elf_gc_mark_hook PARAMS ((bfd *abfd,
struct bfd_link_info *info,
Elf_Internal_Rela *rel,
struct elf_link_hash_entry *h,
Elf_Internal_Sym *sym));
static boolean ppc_elf_gc_sweep_hook PARAMS ((bfd *abfd,
struct bfd_link_info *info,
asection *sec,
const Elf_Internal_Rela *relocs));
static boolean ppc_elf_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *,
struct elf_link_hash_entry *));
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. */
#define PLT_ENTRY_SIZE 12
/* The initial size of the plt reserved for the dynamic linker. */
#define PLT_INITIAL_ENTRY_SIZE 72
/* The size of the gap between entries in the PLT. */
#define PLT_SLOT_SIZE 8
/* The number of single-slot PLT entries (the rest use two slots). */
#define PLT_NUM_SINGLE_ENTRIES 8192
/* Will references to this symbol always reference the symbol
in this object? */
#define SYMBOL_REFERENCES_LOCAL(INFO, H) \
((! INFO->shared \
|| INFO->symbolic \
|| H->dynindx == -1 \
|| ELF_ST_VISIBILITY (H->other) == STV_INTERNAL \
|| ELF_ST_VISIBILITY (H->other) == STV_HIDDEN) \
&& (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
/* Will _calls_ to this symbol always call the version in this object? */
#define SYMBOL_CALLS_LOCAL(INFO, H) \
((! INFO->shared \
|| INFO->symbolic \
|| H->dynindx == -1 \
|| ELF_ST_VISIBILITY (H->other) != STV_DEFAULT) \
&& (H->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
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 */
ppc_elf_addr16_ha_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_dont, /* 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 */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_addr16_ha_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. */
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, because the object being
run has to have the data at some particular address. */
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_. */
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.
FIXME: 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.
FIXME: 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_dont, /* 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. */
HOWTO (R_PPC_PLT16_HA, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_addr16_ha_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_dont, /* 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 */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
ppc_elf_addr16_ha_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 */
ppc_elf_addr16_ha_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 */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_PPC_GNU_VTINHERIT, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_PPC_GNU_VTINHERIT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* GNU extension to record C++ vtable member usage */
HOWTO (R_PPC_GNU_VTENTRY, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_PPC_GNU_VTENTRY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* 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];
}
}
/* This function handles relaxing for the PPC with option --mpc860c0[=<n>].
The MPC860, revision C0 or earlier contains a bug in the die.
If all of the following conditions are true, the next instruction
to be executed *may* be treated as a no-op.
1/ A forward branch is executed.
2/ The branch is predicted as not taken.
3/ The branch is taken.
4/ The branch is located in the last 5 words of a page.
(The EOP limit is 5 by default but may be specified as any value from 1-10.)
Our software solution is to detect these problematic branches in a
linker pass and modify them as follows:
1/ Unconditional branches - Since these are always predicted taken,
there is no problem and no action is required.
2/ Conditional backward branches - No problem, no action required.
3/ Conditional forward branches - Ensure that the "inverse prediction
bit" is set (ensure it is predicted taken).
4/ Conditional register branches - Ensure that the "y bit" is set
(ensure it is predicted taken).
*/
/* Sort sections by address. */
static int
ppc_elf_sort_rela (arg1, arg2)
const void *arg1;
const void *arg2;
{
const Elf_Internal_Rela **rela1 = (const Elf_Internal_Rela**) arg1;
const Elf_Internal_Rela **rela2 = (const Elf_Internal_Rela**) arg2;
/* Sort by offset. */
return ((*rela1)->r_offset - (*rela2)->r_offset);
}
static boolean
ppc_elf_relax_section (abfd, isec, link_info, again)
bfd *abfd;
asection *isec;
struct bfd_link_info *link_info;
boolean *again;
{
#define PAGESIZE 0x1000
bfd_byte *contents = NULL;
bfd_byte *free_contents = NULL;
Elf_Internal_Rela *internal_relocs = NULL;
Elf_Internal_Rela *free_relocs = NULL;
Elf_Internal_Rela **rela_comb = NULL;
int comb_curr, comb_count;
/* We never have to do this more than once per input section. */
*again = false;
/* If needed, initialize this section's cooked size. */
if (isec->_cooked_size == 0)
isec->_cooked_size = isec->_raw_size;
/* We're only interested in text sections which overlap the
troublesome area at the end of a page. */
if (link_info->mpc860c0 && (isec->flags & SEC_CODE) && isec->_cooked_size)
{
bfd_vma dot, end_page, end_section;
boolean section_modified;
/* Get the section contents. */
/* Get cached copy if it exists. */
if (elf_section_data (isec)->this_hdr.contents != NULL)
contents = elf_section_data (isec)->this_hdr.contents;
else
{
/* Go get them off disk. */
contents = (bfd_byte *) bfd_malloc (isec->_raw_size);
if (contents == NULL)
goto error_return;
free_contents = contents;
if (! bfd_get_section_contents (abfd, isec, contents,
(file_ptr) 0, isec->_raw_size))
goto error_return;
}
comb_curr = 0;
comb_count = 0;
if (isec->reloc_count)
{
unsigned n;
/* Get a copy of the native relocations. */
internal_relocs = _bfd_elf32_link_read_relocs (
abfd, isec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
link_info->keep_memory);
if (internal_relocs == NULL)
goto error_return;
if (! link_info->keep_memory)
free_relocs = internal_relocs;
/* Setup a faster access method for the reloc info we need. */
rela_comb = (Elf_Internal_Rela**)
bfd_malloc (isec->reloc_count*sizeof (Elf_Internal_Rela*));
if (rela_comb == NULL)
goto error_return;
for (n = 0; n < isec->reloc_count; ++n)
{
long r_type;
r_type = ELF32_R_TYPE (internal_relocs[n].r_info);
if (r_type < 0 || r_type >= (int) R_PPC_max)
goto error_return;
/* Prologue constants are sometimes present in the ".text"
sections and they can be identified by their associated relocation.
We don't want to process those words and some others which
can also be identified by their relocations. However, not all
conditional branches will have a relocation so we will
only ignore words that 1) have a reloc, and 2) the reloc
is not applicable to a conditional branch.
The array rela_comb is built here for use in the EOP scan loop. */
switch (r_type)
{
case R_PPC_ADDR14_BRNTAKEN: /* absolute, predicted not taken */
case R_PPC_REL14: /* relative cond. br. */
case R_PPC_REL14_BRNTAKEN: /* rel. cond. br., predicted not taken */
/* We should check the instruction. */
break;
default:
/* The word is not a conditional branch - ignore it. */
rela_comb[comb_count++] = &internal_relocs[n];
break;
}
}
if (comb_count > 1)
qsort (rela_comb, (size_t) comb_count, sizeof (int), ppc_elf_sort_rela);
}
/* Enumerate each EOP region that overlaps this section. */
end_section = isec->vma + isec->_cooked_size;
dot = end_page = (isec->vma | (PAGESIZE - 1)) + 1;
dot -= link_info->mpc860c0;
section_modified = false;
if (dot < isec->vma) /* Increment the start position if this section */
dot = isec->vma; /* begins in the middle of its first EOP region. */
for (;
dot < end_section;
dot += PAGESIZE, end_page += PAGESIZE)
{
/* Check each word in this EOP region. */
for (; dot < end_page; dot += 4)
{
bfd_vma isec_offset;
unsigned long insn;
boolean skip, modified;
/* Don't process this word if there is a relocation for it and
the relocation indicates the word is not a conditional branch. */
skip = false;
isec_offset = dot - isec->vma;
for (; comb_curr<comb_count; ++comb_curr)
{
bfd_vma r_offset;
r_offset = rela_comb[comb_curr]->r_offset;
if (r_offset >= isec_offset)
{
if (r_offset == isec_offset) skip = true;
break;
}
}
if (skip) continue;
/* Check the current word for a problematic conditional branch. */
#define BO0(insn) ((insn) & 0x02000000)
#define BO2(insn) ((insn) & 0x00800000)
#define BO4(insn) ((insn) & 0x00200000)
insn = (unsigned long) bfd_get_32 (abfd, contents + isec_offset);
modified = false;
if ((insn & 0xFc000000) == 0x40000000)
{
/* Instruction is BCx */
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
{
bfd_vma target;
/* This branch is predicted as "normal".
If this is a forward branch, it is problematic. */
target = insn & 0x0000Fffc; /*extract*/
target = (target ^ 0x8000) - 0x8000; /*sign extend*/
if ((insn & 0x00000002) == 0)
target += dot; /*convert to abs*/
if (target > dot)
{
insn |= 0x00200000; /* set the prediction bit */
modified = true;
}
}
}
else if ((insn & 0xFc00Fffe) == 0x4c000420)
{
/* Instruction is BCCTRx */
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
{
/* This branch is predicted as not-taken.
If this is a forward branch, it is problematic.
Since we can't tell statically if it will branch forward,
always set the prediction bit. */
insn |= 0x00200000; /* set the prediction bit */
modified = true;
}
}
else if ((insn & 0xFc00Fffe) == 0x4c000020)
{
/* Instruction is BCLRx */
if ((!BO0(insn) || !BO2(insn)) && !BO4(insn))
{
/* This branch is predicted as not-taken.
If this is a forward branch, it is problematic.
Since we can't tell statically if it will branch forward,
always set the prediction bit. */
insn |= 0x00200000; /* set the prediction bit */
modified = true;
}
}
#undef BO0
#undef BO2
#undef BO4
if (modified)
{
bfd_put_32 (abfd, insn, contents + isec_offset);
section_modified = true;
}
}
}
if (section_modified)
{
elf_section_data (isec)->this_hdr.contents = contents;
free_contents = NULL;
}
}
if (rela_comb != NULL)
{
free (rela_comb);
rela_comb = NULL;
}
if (free_relocs != NULL)
{
free (free_relocs);
free_relocs = NULL;
}
if (free_contents != NULL)
{
if (! link_info->keep_memory)
free (free_contents);
else
{
/* Cache the section contents for elf_link_input_bfd. */
elf_section_data (isec)->this_hdr.contents = contents;
}
free_contents = NULL;
}
return true;
error_return:
if (rela_comb != NULL)
free (rela_comb);
if (free_relocs != NULL)
free (free_relocs);
if (free_contents != NULL)
free (free_contents);
return false;
}
static reloc_howto_type *
ppc_elf_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
enum elf_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;
case BFD_RELOC_VTABLE_INHERIT: ppc_reloc = R_PPC_GNU_VTINHERIT; break;
case BFD_RELOC_VTABLE_ENTRY: ppc_reloc = R_PPC_GNU_VTENTRY; 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 ATTRIBUTE_UNUSED;
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)];
}
/* Handle the R_PPC_ADDR16_HA reloc. */
static bfd_reloc_status_type
ppc_elf_addr16_ha_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *reloc_entry;
asymbol *symbol;
PTR data ATTRIBUTE_UNUSED;
asection *input_section;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
bfd_vma relocation;
if (output_bfd != NULL)
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (reloc_entry->address > input_section->_cooked_size)
return bfd_reloc_outofrange;
if (bfd_is_com_section (symbol->section))
relocation = 0;
else
relocation = symbol->value;
relocation += symbol->section->output_section->vma;
relocation += symbol->section->output_offset;
relocation += reloc_entry->addend;
reloc_entry->addend += (relocation & 0x8000) << 1;
return bfd_reloc_continue;
}
/* 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;
{
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|| 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 (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
return false;
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|| 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));
}
/* The output is -mrelocatable-lib iff both the input files are. */
if (! (new_flags & EF_PPC_RELOCATABLE_LIB))
elf_elfheader (obfd)->e_flags &= ~EF_PPC_RELOCATABLE_LIB;
/* The output is -mrelocatable iff it can't be -mrelocatable-lib,
but each input file is either -mrelocatable or -mrelocatable-lib. */
if (! (elf_elfheader (obfd)->e_flags & EF_PPC_RELOCATABLE_LIB)
&& (new_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE))
&& (old_flags & (EF_PPC_RELOCATABLE_LIB | EF_PPC_RELOCATABLE)))
elf_elfheader (obfd)->e_flags |= EF_PPC_RELOCATABLE;
/* 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. */
static boolean
ppc_elf_fake_sections (abfd, shdr, asect)
bfd *abfd ATTRIBUTE_UNUSED;
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;
/* Both of these sections are (technically) created by the user
putting data in them, so they shouldn't be marked
SEC_LINKER_CREATED.
The linker creates them so it has somewhere to attach their
respective symbols. In fact, if they were empty it would
be OK to leave the symbol set to 0 (or any random number), because
the appropriate register should never be used. */
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_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 ATTRIBUTE_UNUSED;
{
return true;
}
/* We have to create .dynsbss and .rela.sbss here so that they get mapped
to output sections (just like _bfd_elf_create_dynamic_sections has
to create .dynbss and .rela.bss). */
static boolean
ppc_elf_create_dynamic_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
register asection *s;
flagword flags;
if (!_bfd_elf_create_dynamic_sections (abfd, info))
return false;
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
s = bfd_make_section (abfd, ".dynsbss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
return false;
if (! info->shared)
{
s = bfd_make_section (abfd, ".rela.sbss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, 2))
return false;
}
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 (! elf_hash_table (info)->dynamic_sections_created
|| SYMBOL_CALLS_LOCAL (info, h)
|| (info->shared && h->plt.refcount <= 0))
{
/* A PLT entry is not required/allowed when:
1. We are not using ld.so; because then the PLT entry
can't be set up, so we can't use one.
2. We know for certain that a call to this symbol
will go to this object.
3. GC has rendered the entry unused.
Note, however, that in an executable all references to the
symbol go to the PLT, so we can't turn it off in that case.
??? The correct thing to do here is to reference count
all uses of the symbol, not just those to the GOT or PLT. */
h->plt.offset = (bfd_vma) -1;
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
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;
}
BFD_ASSERT (h->dynindx != -1);
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
+ (PLT_SLOT_SIZE
* ((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. After the 8192nd entry, room
for two entries is allocated. */
if ((s->_raw_size - PLT_INITIAL_ENTRY_SIZE) / PLT_ENTRY_SIZE
>= PLT_NUM_SINGLE_ENTRIES)
s->_raw_size += 2 * PLT_ENTRY_SIZE;
else
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.
Of course, if the symbol is sufficiently small, we must instead
allocate it in .sbss. FIXME: It would be better to do this if and
only if there were actually SDAREL relocs for that symbol. */
if (h->size <= elf_gp_size (dynobj))
s = bfd_get_section_by_name (dynobj, ".dynsbss");
else
s = bfd_get_section_by_name (dynobj, ".dynbss");
BFD_ASSERT (s != NULL);
/* We must generate a R_PPC_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_ALLOC) != 0)
{
asection *srel;
if (h->size <= elf_gp_size (dynobj))
srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
else
srel = bfd_get_section_by_name (dynobj, ".rela.bss");
BFD_ASSERT (srel != NULL);
srel->_raw_size += sizeof (Elf32_External_Rela);
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 > 4)
power_of_two = 4;
/* 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;
}
/* 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;
}
}
else
{
/* We may have created entries in the .rela.got, .rela.sdata, and
.rela.sdata2 sections. 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.sdata2", ".rela.sbss",
(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_LINKER_CREATED) == 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;
const char *outname;
/* Remember whether there are any relocation sections. */
relocs = true;
/* If this relocation section applies to a read only
section, then we probably need a DT_TEXTREL entry. */
outname = bfd_get_section_name (output_bfd,
s->output_section);
target = bfd_get_section_by_name (output_bfd, outname + 5);
if (target != NULL
&& (target->flags & SEC_READONLY) != 0
&& (target->flags & SEC_ALLOC) != 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)
{
_bfd_strip_section_from_output (info, s);
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_RELA)
|| ! 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, 0)
|| ! bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
sizeof (Elf32_External_Rela)))
return false;
}
if (reltext)
{
if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
return false;
info->flags |= DF_TEXTREL;
}
}
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;
{
bfd *dynobj;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
bfd_signed_vma *local_got_refcounts;
elf_linker_section_t *sdata;
elf_linker_section_t *sdata2;
asection *sreloc;
asection *sgot = NULL;
asection *srelgot = NULL;
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 ((sdata = elf_linker_section (abfd, LINKER_SECTION_SDATA)) == NULL)
{
sdata = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA);
if (!sdata)
return false;
}
if ((sdata2 = elf_linker_section (abfd, LINKER_SECTION_SDATA2)) == NULL)
{
sdata2 = ppc_elf_create_linker_section (abfd, info, LINKER_SECTION_SDATA2);
if (!sdata2)
return false;
}
dynobj = elf_hash_table (info)->dynobj;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
local_got_refcounts = elf_local_got_refcounts (abfd);
sym_hashes = elf_sym_hashes (abfd);
sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);
if (!elf_bad_symtab (abfd))
sym_hashes_end -= symtab_hdr->sh_info;
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];
/* If a relocation refers to _GLOBAL_OFFSET_TABLE_, create the .got.
This shows up in particular in an R_PPC_ADDR32 in the eabi
startup code. */
if (h && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
{
if (sgot == NULL)
{
if (dynobj == NULL)
elf_hash_table (info)->dynobj = dynobj = abfd;
if (! _bfd_elf_create_got_section (dynobj, info))
return false;
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
}
}
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:
/* This symbol requires a global offset table entry. */
if (sgot == NULL)
{
if (dynobj == NULL)
elf_hash_table (info)->dynobj = dynobj = abfd;
if (! _bfd_elf_create_got_section (dynobj, info))
return false;
sgot = bfd_get_section_by_name (dynobj, ".got");
BFD_ASSERT (sgot != NULL);
}
if (srelgot == NULL
&& (h != NULL || info->shared))
{
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
if (srelgot == NULL)
{
srelgot = bfd_make_section (dynobj, ".rela.got");
if (srelgot == NULL
|| ! bfd_set_section_flags (dynobj, srelgot,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
return false;
}
}
if (h != NULL)
{
if (h->got.refcount == -1)
{
/* 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;
/* Allocate space in the .got. */
sgot->_raw_size += 4;
/* Allocate relocation space. */
srelgot->_raw_size += sizeof (Elf32_External_Rela);
h->got.refcount = 1;
}
else
h->got.refcount++;
}
else
{
/* This is a global offset table entry for a local symbol. */
if (local_got_refcounts == NULL)
{
size_t size;
size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
local_got_refcounts = (bfd_signed_vma *)
bfd_alloc (abfd, size);
if (local_got_refcounts == NULL)
return false;
elf_local_got_refcounts (abfd) = local_got_refcounts;
memset (local_got_refcounts, -1, size);
}
if (local_got_refcounts[r_symndx] == -1)
{
sgot->_raw_size += 4;
/* If we are generating a shared object, we need to
output a R_PPC_RELATIVE reloc so that the
dynamic linker can adjust this GOT entry. */
if (info->shared)
srelgot->_raw_size += sizeof (Elf32_External_Rela);
local_got_refcounts[r_symndx] = 1;
}
else
local_got_refcounts[r_symndx]++;
}
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"));
return false;
}
if (srelgot == NULL && (h != NULL || info->shared))
{
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
if (srelgot == NULL)
{
srelgot = bfd_make_section (dynobj, ".rela.got");
if (srelgot == NULL
|| ! bfd_set_section_flags (dynobj, srelgot,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| ! bfd_set_section_alignment (dynobj, srelgot, 2))
return false;
}
}
if (!bfd_elf32_create_pointer_linker_section (abfd, info, sdata, h, rel))
return 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"));
return false;
}
if (srelgot == NULL && (h != NULL || info->shared))
{
srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
if (srelgot == NULL)
{
srelgot = bfd_make_section (dynobj, ".rela.got");
if (srelgot == NULL
|| ! bfd_set_section_flags (dynobj, srelgot,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| ! bfd_set_section_alignment (dynobj, srelgot, 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));
return 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);
return false;
}
/* 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;
}
if (h->plt.refcount == -1)
{
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
h->plt.refcount = 1;
}
else
h->plt.refcount++;
break;
/* The following relocations don't need to propagate 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;
/* This refers only to functions defined in the shared library */
case R_PPC_LOCAL24PC:
break;
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_PPC_GNU_VTINHERIT:
if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
return false;
break;
/* This relocation describes which C++ vtable entries are actually
used. Record for later use during GC. */
case R_PPC_GNU_VTENTRY:
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
return false;
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:
case R_PPC_REL14:
case R_PPC_REL14_BRTAKEN:
case R_PPC_REL14_BRNTAKEN:
case R_PPC_REL32:
if (h == NULL
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
|| SYMBOL_REFERENCES_LOCAL (info, h))
break;
/* fall through */
default:
if (info->shared)
{
#ifdef DEBUG
fprintf (stderr, "ppc_elf_check_relocs need to create relocation for %s\n",
(h && h->root.root.string) ? h->root.root.string : "<unknown>");
#endif
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)
return false;
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)
{
flagword flags;
sreloc = bfd_make_section (dynobj, name);
flags = (SEC_HAS_CONTENTS | SEC_READONLY
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
if ((sec->flags & SEC_ALLOC) != 0)
flags |= SEC_ALLOC | SEC_LOAD;
if (sreloc == NULL
|| ! bfd_set_section_flags (dynobj, sreloc, flags)
|| ! bfd_set_section_alignment (dynobj, sreloc, 2))
return false;
}
}
sreloc->_raw_size += sizeof (Elf32_External_Rela);
/* FIXME: We should here do what the m68k and i386
backends do: if the reloc is pc-relative, record it
in case it turns out that the reloc is unnecessary
because the symbol is forced local by versioning or
we are linking with -Bdynamic. Fortunately this
case is not frequent. */
}
break;
}
}
return true;
}
/* Return the section that should be marked against GC for a given
relocation. */
static asection *
ppc_elf_gc_mark_hook (abfd, info, rel, h, sym)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
Elf_Internal_Rela *rel;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
{
if (h != NULL)
{
switch (ELF32_R_TYPE (rel->r_info))
{
case R_PPC_GNU_VTINHERIT:
case R_PPC_GNU_VTENTRY:
break;
default:
switch (h->root.type)
{
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
return h->root.u.def.section;
case bfd_link_hash_common:
return h->root.u.c.p->section;
default:
break;
}
}
}
else
{
if (!(elf_bad_symtab (abfd)
&& ELF_ST_BIND (sym->st_info) != STB_LOCAL)
&& ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
&& sym->st_shndx != SHN_COMMON))
{
return bfd_section_from_elf_index (abfd, sym->st_shndx);
}
}
return NULL;
}
/* Update the got entry reference counts for the section being removed. */
static boolean
ppc_elf_gc_sweep_hook (abfd, info, sec, relocs)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
asection *sec;
const Elf_Internal_Rela *relocs;
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
bfd_signed_vma *local_got_refcounts;
const Elf_Internal_Rela *rel, *relend;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
local_got_refcounts = elf_local_got_refcounts (abfd);
relend = relocs + sec->reloc_count;
for (rel = relocs; rel < relend; rel++)
switch (ELF32_R_TYPE (rel->r_info))
{
case R_PPC_GOT16:
case R_PPC_GOT16_LO:
case R_PPC_GOT16_HI:
case R_PPC_GOT16_HA:
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx >= symtab_hdr->sh_info)
{
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
if (h->got.refcount > 0)
h->got.refcount--;
}
else if (local_got_refcounts != NULL)
{
if (local_got_refcounts[r_symndx] > 0)
local_got_refcounts[r_symndx]--;
}
break;
case R_PPC_PLT32:
case R_PPC_PLTREL24:
case R_PPC_PLT16_LO:
case R_PPC_PLT16_HI:
case R_PPC_PLT16_HA:
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx >= symtab_hdr->sh_info)
{
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
if (h->plt.refcount > 0)
h->plt.refcount--;
}
break;
default:
break;
}
return true;
}
/* 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. */
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 ATTRIBUTE_UNUSED;
flagword *flagsp ATTRIBUTE_UNUSED;
asection **secp;
bfd_vma *valp;
{
if (sym->st_shndx == SHN_COMMON
&& !info->relocateable
&& sym->st_size <= (bfd_vma) 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)
{
/* We don't go through bfd_make_section, because we don't
want to attach this common section to DYNOBJ. The linker
will move the symbols to the appropriate output section
when it defines common symbols. */
sdata->bss_section = ((asection *)
bfd_zalloc (abfd, sizeof (asection)));
if (sdata->bss_section == NULL)
return false;
sdata->bss_section->name = sdata->bss_name;
sdata->bss_section->flags = SEC_IS_COMMON;
sdata->bss_section->output_section = sdata->bss_section;
sdata->bss_section->symbol =
(asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
sdata->bss_section->symbol_ptr_ptr =
(asymbol **) bfd_zalloc (abfd, sizeof (asymbol *));
if (sdata->bss_section->symbol == NULL
|| sdata->bss_section->symbol_ptr_ptr == NULL)
return false;
sdata->bss_section->symbol->name = sdata->bss_name;
sdata->bss_section->symbol->flags = BSF_SECTION_SYM;
sdata->bss_section->symbol->section = sdata->bss_section;
*sdata->bss_section->symbol_ptr_ptr = sdata->bss_section->symbol;
}
*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;
bfd_vma reloc_index;
#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 ppc 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;
reloc_index = (h->plt.offset - PLT_INITIAL_ENTRY_SIZE) / PLT_SLOT_SIZE;
if (reloc_index > PLT_NUM_SINGLE_ENTRIES)
reloc_index -= (reloc_index - PLT_NUM_SINGLE_ENTRIES) / 2;
bfd_elf32_swap_reloca_out (output_bfd, &rela,
((Elf32_External_Rela *) srela->contents
+ reloc_index));
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 the symbol is weak, we do need to clear the value.
Otherwise, the PLT entry would provide a definition for
the symbol even if the symbol wasn't defined anywhere,
and so the symbol would never be NULL. */
if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK)
== 0)
sym->st_value = 0;
}
}
if (h->got.offset != (bfd_vma) -1)
{
asection *sgot;
asection *srela;
Elf_Internal_Rela rela;
/* This symbol has an entry in the global offset table. Set it
up. */
sgot = bfd_get_section_by_name (dynobj, ".got");
srela = bfd_get_section_by_name (dynobj, ".rela.got");
BFD_ASSERT (sgot != NULL && srela != NULL);
rela.r_offset = (sgot->output_section->vma
+ sgot->output_offset
+ (h->got.offset &~ 1));
/* If this is a -Bsymbolic link, and the symbol is defined
locally, we just want to emit a RELATIVE reloc. The entry in
the global offset table will already have been initialized in
the relocate_section function. */
if (info->shared
&& SYMBOL_REFERENCES_LOCAL (info, h))
{
rela.r_info = ELF32_R_INFO (0, R_PPC_RELATIVE);
rela.r_addend = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
}
else
{
BFD_ASSERT ((h->got.offset & 1) == 0);
bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset);
rela.r_info = ELF32_R_INFO (h->dynindx, R_PPC_GLOB_DAT);
rela.r_addend = 0;
}
bfd_elf32_swap_reloca_out (output_bfd, &rela,
((Elf32_External_Rela *) srela->contents
+ srela->reloc_count));
++srela->reloc_count;
}
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);
if (h->size <= elf_gp_size (dynobj))
s = bfd_get_section_by_name (h->root.u.def.section->owner,
".rela.sbss");
else
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;
asection *sgot = bfd_get_section_by_name (dynobj, ".got");
#ifdef DEBUG
fprintf (stderr, "ppc_elf_finish_dynamic_sections called\n");
#endif
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
if