blob: 0e6be9b0151057fa0047c3384b117d5c3df28bbe [file] [log] [blame]
/* Hitachi SH specific support for 32-bit ELF
Copyright 1996, 1997, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
Contributed 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. */
#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/sh.h"
static bfd_reloc_status_type sh_elf_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_reloc_status_type sh_elf_ignore_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type *sh_elf_reloc_type_lookup
PARAMS ((bfd *, bfd_reloc_code_real_type));
static void sh_elf_info_to_howto
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
static boolean sh_elf_set_private_flags
PARAMS ((bfd *, flagword));
static boolean sh_elf_copy_private_data
PARAMS ((bfd *, bfd *));
static boolean sh_elf_merge_private_data
PARAMS ((bfd *, bfd *));
static boolean sh_elf_set_mach_from_flags
PARAMS ((bfd *));
static boolean sh_elf_relax_section
PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
static boolean sh_elf_relax_delete_bytes
PARAMS ((bfd *, asection *, bfd_vma, int));
static boolean sh_elf_align_loads
PARAMS ((bfd *, asection *, Elf_Internal_Rela *, bfd_byte *, boolean *));
static boolean sh_elf_swap_insns
PARAMS ((bfd *, asection *, PTR, bfd_byte *, bfd_vma));
static boolean sh_elf_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static bfd_byte *sh_elf_get_relocated_section_contents
PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *,
bfd_byte *, boolean, asymbol **));
static boolean sh_elf_check_relocs
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
static struct bfd_hash_entry *sh_elf_link_hash_newfunc
PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
static struct bfd_link_hash_table *sh_elf_link_hash_table_create
PARAMS ((bfd *));
static boolean sh_elf_adjust_dynamic_symbol
PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
static boolean sh_elf_size_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean sh_elf_finish_dynamic_symbol
PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
Elf_Internal_Sym *));
static boolean sh_elf_finish_dynamic_sections
PARAMS ((bfd *, struct bfd_link_info *));
/* The name of the dynamic interpreter. This is put in the .interp
section. */
#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
static reloc_howto_type sh_elf_howto_table[] =
{
/* No relocation. */
HOWTO (R_SH_NONE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 32 bit absolute relocation. Setting partial_inplace to true and
src_mask to a non-zero value is similar to the COFF toolchain. */
HOWTO (R_SH_DIR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
sh_elf_reloc, /* special_function */
"R_SH_DIR32", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 32 bit PC relative relocation. */
HOWTO (R_SH_REL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_REL32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit PC relative branch divided by 2. */
HOWTO (R_SH_DIR8WPN, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8WPN", /* name */
true, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 12 bit PC relative branch divided by 2. */
HOWTO (R_SH_IND12W, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
12, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
sh_elf_reloc, /* special_function */
"R_SH_IND12W", /* name */
true, /* partial_inplace */
0xfff, /* src_mask */
0xfff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit unsigned PC relative divided by 4. */
HOWTO (R_SH_DIR8WPL, /* type */
2, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8WPL", /* name */
true, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit unsigned PC relative divided by 2. */
HOWTO (R_SH_DIR8WPZ, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8WPZ", /* name */
true, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit GBR relative. FIXME: This only makes sense if we have some
special symbol for the GBR relative area, and that is not
implemented. */
HOWTO (R_SH_DIR8BP, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8BP", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit GBR relative divided by 2. FIXME: This only makes sense if
we have some special symbol for the GBR relative area, and that
is not implemented. */
HOWTO (R_SH_DIR8W, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8W", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit GBR relative divided by 4. FIXME: This only makes sense if
we have some special symbol for the GBR relative area, and that
is not implemented. */
HOWTO (R_SH_DIR8L, /* type */
2, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DIR8L", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
EMPTY_HOWTO (10),
EMPTY_HOWTO (11),
EMPTY_HOWTO (12),
EMPTY_HOWTO (13),
EMPTY_HOWTO (14),
EMPTY_HOWTO (15),
EMPTY_HOWTO (16),
EMPTY_HOWTO (17),
EMPTY_HOWTO (18),
EMPTY_HOWTO (19),
EMPTY_HOWTO (20),
EMPTY_HOWTO (21),
EMPTY_HOWTO (22),
EMPTY_HOWTO (23),
EMPTY_HOWTO (24),
/* The remaining relocs are a GNU extension used for relaxing. The
final pass of the linker never needs to do anything with any of
these relocs. Any required operations are handled by the
relaxation code. */
/* A 16 bit switch table entry. This is generated for an expression
such as ``.word L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_SH_SWITCH16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_SWITCH16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* A 32 bit switch table entry. This is generated for an expression
such as ``.long L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_SH_SWITCH32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_SWITCH32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* Indicates a .uses pseudo-op. The compiler will generate .uses
pseudo-ops when it finds a function call which can be relaxed.
The offset field holds the PC relative offset to the instruction
which loads the register used in the function call. */
HOWTO (R_SH_USES, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_USES", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* The assembler will generate this reloc for addresses referred to
by the register loads associated with USES relocs. The offset
field holds the number of times the address is referenced in the
object file. */
HOWTO (R_SH_COUNT, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_COUNT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* Indicates an alignment statement. The offset field is the power
of 2 to which subsequent portions of the object file must be
aligned. */
HOWTO (R_SH_ALIGN, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_ALIGN", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* The assembler will generate this reloc before a block of
instructions. A section should be processed as assumining it
contains data, unless this reloc is seen. */
HOWTO (R_SH_CODE, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_CODE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* The assembler will generate this reloc after a block of
instructions when it sees data that is not instructions. */
HOWTO (R_SH_DATA, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_DATA", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* The assembler generates this reloc for each label within a block
of instructions. This permits the linker to avoid swapping
instructions which are the targets of branches. */
HOWTO (R_SH_LABEL, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_LABEL", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* An 8 bit switch table entry. This is generated for an expression
such as ``.word L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_SH_SWITCH8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_SWITCH8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_SH_GNU_VTINHERIT, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_SH_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_SH_GNU_VTENTRY, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
_bfd_elf_rel_vtable_reloc_fn, /* special_function */
"R_SH_GNU_VTENTRY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* 8 bit PC relative divided by 2 - but specified in a very odd way. */
HOWTO (R_SH_LOOP_START, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_LOOP_START", /* name */
true, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* 8 bit PC relative divided by 2 - but specified in a very odd way. */
HOWTO (R_SH_LOOP_END, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
sh_elf_ignore_reloc, /* special_function */
"R_SH_LOOP_END", /* name */
true, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
EMPTY_HOWTO (38),
EMPTY_HOWTO (39),
EMPTY_HOWTO (40),
EMPTY_HOWTO (41),
EMPTY_HOWTO (42),
EMPTY_HOWTO (43),
EMPTY_HOWTO (44),
EMPTY_HOWTO (45),
EMPTY_HOWTO (46),
EMPTY_HOWTO (47),
EMPTY_HOWTO (48),
EMPTY_HOWTO (49),
EMPTY_HOWTO (50),
EMPTY_HOWTO (51),
EMPTY_HOWTO (52),
EMPTY_HOWTO (53),
EMPTY_HOWTO (54),
EMPTY_HOWTO (55),
EMPTY_HOWTO (56),
EMPTY_HOWTO (57),
EMPTY_HOWTO (58),
EMPTY_HOWTO (59),
EMPTY_HOWTO (60),
EMPTY_HOWTO (61),
EMPTY_HOWTO (62),
EMPTY_HOWTO (63),
EMPTY_HOWTO (64),
EMPTY_HOWTO (65),
EMPTY_HOWTO (66),
EMPTY_HOWTO (67),
EMPTY_HOWTO (68),
EMPTY_HOWTO (69),
EMPTY_HOWTO (70),
EMPTY_HOWTO (71),
EMPTY_HOWTO (72),
EMPTY_HOWTO (73),
EMPTY_HOWTO (74),
EMPTY_HOWTO (75),
EMPTY_HOWTO (76),
EMPTY_HOWTO (77),
EMPTY_HOWTO (78),
EMPTY_HOWTO (79),
EMPTY_HOWTO (80),
EMPTY_HOWTO (81),
EMPTY_HOWTO (82),
EMPTY_HOWTO (83),
EMPTY_HOWTO (84),
EMPTY_HOWTO (85),
EMPTY_HOWTO (86),
EMPTY_HOWTO (87),
EMPTY_HOWTO (88),
EMPTY_HOWTO (89),
EMPTY_HOWTO (90),
EMPTY_HOWTO (91),
EMPTY_HOWTO (92),
EMPTY_HOWTO (93),
EMPTY_HOWTO (94),
EMPTY_HOWTO (95),
EMPTY_HOWTO (96),
EMPTY_HOWTO (97),
EMPTY_HOWTO (98),
EMPTY_HOWTO (99),
EMPTY_HOWTO (100),
EMPTY_HOWTO (101),
EMPTY_HOWTO (102),
EMPTY_HOWTO (103),
EMPTY_HOWTO (104),
EMPTY_HOWTO (105),
EMPTY_HOWTO (106),
EMPTY_HOWTO (107),
EMPTY_HOWTO (108),
EMPTY_HOWTO (109),
EMPTY_HOWTO (110),
EMPTY_HOWTO (111),
EMPTY_HOWTO (112),
EMPTY_HOWTO (113),
EMPTY_HOWTO (114),
EMPTY_HOWTO (115),
EMPTY_HOWTO (116),
EMPTY_HOWTO (117),
EMPTY_HOWTO (118),
EMPTY_HOWTO (119),
EMPTY_HOWTO (120),
EMPTY_HOWTO (121),
EMPTY_HOWTO (122),
EMPTY_HOWTO (123),
EMPTY_HOWTO (124),
EMPTY_HOWTO (125),
EMPTY_HOWTO (126),
EMPTY_HOWTO (127),
EMPTY_HOWTO (128),
EMPTY_HOWTO (129),
EMPTY_HOWTO (130),
EMPTY_HOWTO (131),
EMPTY_HOWTO (132),
EMPTY_HOWTO (133),
EMPTY_HOWTO (134),
EMPTY_HOWTO (135),
EMPTY_HOWTO (136),
EMPTY_HOWTO (137),
EMPTY_HOWTO (138),
EMPTY_HOWTO (139),
EMPTY_HOWTO (140),
EMPTY_HOWTO (141),
EMPTY_HOWTO (142),
EMPTY_HOWTO (143),
EMPTY_HOWTO (144),
EMPTY_HOWTO (145),
EMPTY_HOWTO (146),
EMPTY_HOWTO (147),
EMPTY_HOWTO (148),
EMPTY_HOWTO (149),
EMPTY_HOWTO (150),
EMPTY_HOWTO (151),
EMPTY_HOWTO (152),
EMPTY_HOWTO (153),
EMPTY_HOWTO (154),
EMPTY_HOWTO (155),
EMPTY_HOWTO (156),
EMPTY_HOWTO (157),
EMPTY_HOWTO (158),
EMPTY_HOWTO (159),
HOWTO (R_SH_GOT32, /* 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, /* */
"R_SH_GOT32", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_PLT32, /* 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, /* */
"R_SH_PLT32", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
HOWTO (R_SH_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, /* */
"R_SH_COPY", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_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, /* */
"R_SH_GLOB_DAT", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_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, /* */
"R_SH_JMP_SLOT", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_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, /* */
"R_SH_RELATIVE", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_GOTOFF, /* 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, /* */
"R_SH_GOTOFF", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_SH_GOTPC, /* 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, /* */
"R_SH_GOTPC", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
};
static bfd_reloc_status_type
sh_elf_reloc_loop (r_type, input_bfd, input_section, contents, addr,
symbol_section, start, end)
int r_type ATTRIBUTE_UNUSED;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
bfd_vma addr;
asection *symbol_section;
bfd_vma start, end;
{
static bfd_vma last_addr;
static asection *last_symbol_section;
bfd_byte *free_contents = NULL;
bfd_byte *start_ptr, *ptr, *last_ptr;
int diff, cum_diff;
bfd_signed_vma x;
int insn;
/* Sanity check the address. */
if (addr > input_section->_raw_size)
return bfd_reloc_outofrange;
/* We require the start and end relocations to be processed consecutively -
although we allow then to be processed forwards or backwards. */
if (! last_addr)
{
last_addr = addr;
last_symbol_section = symbol_section;
return bfd_reloc_ok;
}
if (last_addr != addr)
abort ();
last_addr = 0;
if (! symbol_section || last_symbol_section != symbol_section || end < start)
return bfd_reloc_outofrange;
/* Get the symbol_section contents. */
if (symbol_section != input_section)
{
if (elf_section_data (symbol_section)->this_hdr.contents != NULL)
contents = elf_section_data (symbol_section)->this_hdr.contents;
else
{
free_contents = contents
= (bfd_byte *) bfd_malloc (symbol_section->_raw_size);
if (contents == NULL)
return bfd_reloc_outofrange;
if (! bfd_get_section_contents (input_bfd, symbol_section, contents,
(file_ptr) 0,
symbol_section->_raw_size))
{
free (contents);
return bfd_reloc_outofrange;
}
}
}
#define IS_PPI(PTR) ((bfd_get_16 (input_bfd, (PTR)) & 0xfc00) == 0xf800)
start_ptr = contents + start;
for (cum_diff = -6, ptr = contents + end; cum_diff < 0 && ptr > start_ptr;)
{
for (last_ptr = ptr, ptr -= 4; ptr >= start_ptr && IS_PPI (ptr);)
ptr -= 2;
ptr += 2;
diff = (last_ptr - ptr) >> 1;
cum_diff += diff & 1;
cum_diff += diff;
}
/* Calculate the start / end values to load into rs / re minus four -
so that will cancel out the four we would otherwise have to add to
addr to get the value to subtract in order to get relative addressing. */
if (cum_diff >= 0)
{
start -= 4;
end = (ptr + cum_diff * 2) - contents;
}
else
{
bfd_vma start0 = start - 4;
while (start0 && IS_PPI (contents + start0))
start0 -= 2;
start0 = start - 2 - ((start - start0) & 2);
start = start0 - cum_diff - 2;
end = start0;
}
if (free_contents)
free (free_contents);
insn = bfd_get_16 (input_bfd, contents + addr);
x = (insn & 0x200 ? end : start) - addr;
if (input_section != symbol_section)
x += ((symbol_section->output_section->vma + symbol_section->output_offset)
- (input_section->output_section->vma
+ input_section->output_offset));
x >>= 1;
if (x < -128 || x > 127)
return bfd_reloc_overflow;
x = (insn & ~0xff) | (x & 0xff);
bfd_put_16 (input_bfd, x, contents + addr);
return bfd_reloc_ok;
}
/* This function is used for normal relocs. This used to be like the COFF
function, and is almost certainly incorrect for other ELF targets. */
static bfd_reloc_status_type
sh_elf_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol_in;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
unsigned long insn;
bfd_vma sym_value;
enum elf_sh_reloc_type r_type;
bfd_vma addr = reloc_entry->address;
bfd_byte *hit_data = addr + (bfd_byte *) data;
r_type = (enum elf_sh_reloc_type) reloc_entry->howto->type;
if (output_bfd != NULL)
{
/* Partial linking--do nothing. */
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
/* Almost all relocs have to do with relaxing. If any work must be
done for them, it has been done in sh_relax_section. */
if (r_type == R_SH_IND12W && (symbol_in->flags & BSF_LOCAL) != 0)
return bfd_reloc_ok;
if (symbol_in != NULL
&& bfd_is_und_section (symbol_in->section))
return bfd_reloc_undefined;
if (bfd_is_com_section (symbol_in->section))
sym_value = 0;
else
sym_value = (symbol_in->value +
symbol_in->section->output_section->vma +
symbol_in->section->output_offset);
switch (r_type)
{
case R_SH_DIR32:
insn = bfd_get_32 (abfd, hit_data);
insn += sym_value + reloc_entry->addend;
bfd_put_32 (abfd, insn, hit_data);
break;
case R_SH_IND12W:
insn = bfd_get_16 (abfd, hit_data);
sym_value += reloc_entry->addend;
sym_value -= (input_section->output_section->vma
+ input_section->output_offset
+ addr
+ 4);
sym_value += (insn & 0xfff) << 1;
if (insn & 0x800)
sym_value -= 0x1000;
insn = (insn & 0xf000) | (sym_value & 0xfff);
bfd_put_16 (abfd, insn, hit_data);
if (sym_value < (bfd_vma) -0x1000 || sym_value >= 0x1000)
return bfd_reloc_overflow;
break;
default:
abort ();
break;
}
return bfd_reloc_ok;
}
/* This function is used for relocs which are only used for relaxing,
which the linker should otherwise ignore. */
static bfd_reloc_status_type
sh_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *reloc_entry;
asymbol *symbol ATTRIBUTE_UNUSED;
PTR data ATTRIBUTE_UNUSED;
asection *input_section;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
if (output_bfd != NULL)
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
/* This structure is used to map BFD reloc codes to SH ELF relocs. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
/* An array mapping BFD reloc codes to SH ELF relocs. */
static const struct elf_reloc_map sh_reloc_map[] =
{
{ BFD_RELOC_NONE, R_SH_NONE },
{ BFD_RELOC_32, R_SH_DIR32 },
{ BFD_RELOC_CTOR, R_SH_DIR32 },
{ BFD_RELOC_32_PCREL, R_SH_REL32 },
{ BFD_RELOC_SH_PCDISP8BY2, R_SH_DIR8WPN },
{ BFD_RELOC_SH_PCDISP12BY2, R_SH_IND12W },
{ BFD_RELOC_SH_PCRELIMM8BY2, R_SH_DIR8WPZ },
{ BFD_RELOC_SH_PCRELIMM8BY4, R_SH_DIR8WPL },
{ BFD_RELOC_8_PCREL, R_SH_SWITCH8 },
{ BFD_RELOC_SH_SWITCH16, R_SH_SWITCH16 },
{ BFD_RELOC_SH_SWITCH32, R_SH_SWITCH32 },
{ BFD_RELOC_SH_USES, R_SH_USES },
{ BFD_RELOC_SH_COUNT, R_SH_COUNT },
{ BFD_RELOC_SH_ALIGN, R_SH_ALIGN },
{ BFD_RELOC_SH_CODE, R_SH_CODE },
{ BFD_RELOC_SH_DATA, R_SH_DATA },
{ BFD_RELOC_SH_LABEL, R_SH_LABEL },
{ BFD_RELOC_VTABLE_INHERIT, R_SH_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_SH_GNU_VTENTRY },
{ BFD_RELOC_SH_LOOP_START, R_SH_LOOP_START },
{ BFD_RELOC_SH_LOOP_END, R_SH_LOOP_END },
{ BFD_RELOC_32_GOT_PCREL, R_SH_GOT32 },
{ BFD_RELOC_32_PLT_PCREL, R_SH_PLT32 },
{ BFD_RELOC_SH_COPY, R_SH_COPY },
{ BFD_RELOC_SH_GLOB_DAT, R_SH_GLOB_DAT },
{ BFD_RELOC_SH_JMP_SLOT, R_SH_JMP_SLOT },
{ BFD_RELOC_SH_RELATIVE, R_SH_RELATIVE },
{ BFD_RELOC_32_GOTOFF, R_SH_GOTOFF },
{ BFD_RELOC_SH_GOTPC, R_SH_GOTPC },
};
/* Given a BFD reloc code, return the howto structure for the
corresponding SH ELf reloc. */
static reloc_howto_type *
sh_elf_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0; i < sizeof (sh_reloc_map) / sizeof (struct elf_reloc_map); i++)
{
if (sh_reloc_map[i].bfd_reloc_val == code)
return &sh_elf_howto_table[(int) sh_reloc_map[i].elf_reloc_val];
}
return NULL;
}
/* Given an ELF reloc, fill in the howto field of a relent. */
static void
sh_elf_info_to_howto (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *cache_ptr;
Elf_Internal_Rela *dst;
{
unsigned int r;
r = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r < (unsigned int) R_SH_max);
BFD_ASSERT (r < R_SH_FIRST_INVALID_RELOC || r > R_SH_LAST_INVALID_RELOC);
BFD_ASSERT (r < R_SH_FIRST_INVALID_RELOC_2 || r > R_SH_LAST_INVALID_RELOC_2);
cache_ptr->howto = &sh_elf_howto_table[r];
}
/* This function handles relaxing for SH ELF. See the corresponding
function in coff-sh.c for a description of what this does. FIXME:
There is a lot of duplication here between this code and the COFF
specific code. The format of relocs and symbols is wound deeply
into this code, but it would still be better if the duplication
could be eliminated somehow. Note in particular that although both
functions use symbols like R_SH_CODE, those symbols have different
values; in coff-sh.c they come from include/coff/sh.h, whereas here
they come from enum elf_sh_reloc_type in include/elf/sh.h. */
static boolean
sh_elf_relax_section (abfd, sec, link_info, again)
bfd *abfd;
asection *sec;
struct bfd_link_info *link_info;
boolean *again;
{
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *free_relocs = NULL;
boolean have_code;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *contents = NULL;
bfd_byte *free_contents = NULL;
Elf32_External_Sym *extsyms = NULL;
Elf32_External_Sym *free_extsyms = NULL;
*again = false;
if (link_info->relocateable
|| (sec->flags & SEC_RELOC) == 0
|| sec->reloc_count == 0)
return true;
/* If this is the first time we have been called for this section,
initialize the cooked size. */
if (sec->_cooked_size == 0)
sec->_cooked_size = sec->_raw_size;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
internal_relocs = (_bfd_elf32_link_read_relocs
(abfd, sec, (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;
have_code = false;
irelend = internal_relocs + sec->reloc_count;
for (irel = internal_relocs; irel < irelend; irel++)
{
bfd_vma laddr, paddr, symval;
unsigned short insn;
Elf_Internal_Rela *irelfn, *irelscan, *irelcount;
bfd_signed_vma foff;
if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_CODE)
have_code = true;
if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_USES)
continue;
/* Get the section contents. */
if (contents == NULL)
{
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
else
{
contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
if (contents == NULL)
goto error_return;
free_contents = contents;
if (! bfd_get_section_contents (abfd, sec, contents,
(file_ptr) 0, sec->_raw_size))
goto error_return;
}
}
/* The r_addend field of the R_SH_USES reloc will point us to
the register load. The 4 is because the r_addend field is
computed as though it were a jump offset, which are based
from 4 bytes after the jump instruction. */
laddr = irel->r_offset + 4 + irel->r_addend;
if (laddr >= sec->_raw_size)
{
(*_bfd_error_handler) (_("%s: 0x%lx: warning: bad R_SH_USES offset"),
bfd_get_filename (abfd),
(unsigned long) irel->r_offset);
continue;
}
insn = bfd_get_16 (abfd, contents + laddr);
/* If the instruction is not mov.l NN,rN, we don't know what to
do. */
if ((insn & 0xf000) != 0xd000)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: warning: R_SH_USES points to unrecognized insn 0x%x"),
bfd_get_filename (abfd), (unsigned long) irel->r_offset, insn));
continue;
}
/* Get the address from which the register is being loaded. The
displacement in the mov.l instruction is quadrupled. It is a
displacement from four bytes after the movl instruction, but,
before adding in the PC address, two least significant bits
of the PC are cleared. We assume that the section is aligned
on a four byte boundary. */
paddr = insn & 0xff;
paddr *= 4;
paddr += (laddr + 4) & ~3;
if (paddr >= sec->_raw_size)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: warning: bad R_SH_USES load offset"),
bfd_get_filename (abfd), (unsigned long) irel->r_offset));
continue;
}
/* Get the reloc for the address from which the register is
being loaded. This reloc will tell us which function is
actually being called. */
for (irelfn = internal_relocs; irelfn < irelend; irelfn++)
if (irelfn->r_offset == paddr
&& ELF32_R_TYPE (irelfn->r_info) == (int) R_SH_DIR32)
break;
if (irelfn >= irelend)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: warning: could not find expected reloc"),
bfd_get_filename (abfd), (unsigned long) paddr));
continue;
}
/* Read this BFD's symbols if we haven't done so already. */
if (extsyms == NULL)
{
if (symtab_hdr->contents != NULL)
extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
else
{
extsyms = ((Elf32_External_Sym *)
bfd_malloc (symtab_hdr->sh_size));
if (extsyms == NULL)
goto error_return;
free_extsyms = extsyms;
if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|| (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd)
!= symtab_hdr->sh_size))
goto error_return;
}
}
/* Get the value of the symbol referred to by the reloc. */
if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info)
{
Elf_Internal_Sym isym;
/* A local symbol. */
bfd_elf32_swap_symbol_in (abfd,
extsyms + ELF32_R_SYM (irelfn->r_info),
&isym);
if (isym.st_shndx != _bfd_elf_section_from_bfd_section (abfd, sec))
{
((*_bfd_error_handler)
(_("%s: 0x%lx: warning: symbol in unexpected section"),
bfd_get_filename (abfd), (unsigned long) paddr));
continue;
}
symval = (isym.st_value
+ sec->output_section->vma
+ sec->output_offset);
}
else
{
unsigned long indx;
struct elf_link_hash_entry *h;
indx = ELF32_R_SYM (irelfn->r_info) - symtab_hdr->sh_info;
h = elf_sym_hashes (abfd)[indx];
BFD_ASSERT (h != NULL);
if (h->root.type != bfd_link_hash_defined
&& h->root.type != bfd_link_hash_defweak)
{
/* This appears to be a reference to an undefined
symbol. Just ignore it--it will be caught by the
regular reloc processing. */
continue;
}
symval = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
}
symval += bfd_get_32 (abfd, contents + paddr);
/* See if this function call can be shortened. */
foff = (symval
- (irel->r_offset
+ sec->output_section->vma
+ sec->output_offset
+ 4));
if (foff < -0x1000 || foff >= 0x1000)
{
/* After all that work, we can't shorten this function call. */
continue;
}
/* Shorten the function call. */
/* For simplicity of coding, we are going to modify the section
contents, the section relocs, and the BFD symbol table. We
must tell the rest of the code not to free up this
information. It would be possible to instead create a table
of changes which have to be made, as is done in coff-mips.c;
that would be more work, but would require less memory when
the linker is run. */
elf_section_data (sec)->relocs = internal_relocs;
free_relocs = NULL;
elf_section_data (sec)->this_hdr.contents = contents;
free_contents = NULL;
symtab_hdr->contents = (bfd_byte *) extsyms;
free_extsyms = NULL;
/* Replace the jsr with a bsr. */
/* Change the R_SH_USES reloc into an R_SH_IND12W reloc, and
replace the jsr with a bsr. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irelfn->r_info), R_SH_IND12W);
if (ELF32_R_SYM (irelfn->r_info) < symtab_hdr->sh_info)
{
/* If this needs to be changed because of future relaxing,
it will be handled here like other internal IND12W
relocs. */
bfd_put_16 (abfd,
0xb000 | ((foff >> 1) & 0xfff),
contents + irel->r_offset);
}
else
{
/* We can't fully resolve this yet, because the external
symbol value may be changed by future relaxing. We let
the final link phase handle it. */
bfd_put_16 (abfd, 0xb000, contents + irel->r_offset);
}
/* See if there is another R_SH_USES reloc referring to the same
register load. */
for (irelscan = internal_relocs; irelscan < irelend; irelscan++)
if (ELF32_R_TYPE (irelscan->r_info) == (int) R_SH_USES
&& laddr == irelscan->r_offset + 4 + irelscan->r_addend)
break;
if (irelscan < irelend)
{
/* Some other function call depends upon this register load,
and we have not yet converted that function call.
Indeed, we may never be able to convert it. There is
nothing else we can do at this point. */
continue;
}
/* Look for a R_SH_COUNT reloc on the location where the
function address is stored. Do this before deleting any
bytes, to avoid confusion about the address. */
for (irelcount = internal_relocs; irelcount < irelend; irelcount++)
if (irelcount->r_offset == paddr
&& ELF32_R_TYPE (irelcount->r_info) == (int) R_SH_COUNT)
break;
/* Delete the register load. */
if (! sh_elf_relax_delete_bytes (abfd, sec, laddr, 2))
goto error_return;
/* That will change things, so, just in case it permits some
other function call to come within range, we should relax
again. Note that this is not required, and it may be slow. */
*again = true;
/* Now check whether we got a COUNT reloc. */
if (irelcount >= irelend)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: warning: could not find expected COUNT reloc"),
bfd_get_filename (abfd), (unsigned long) paddr));
continue;
}
/* The number of uses is stored in the r_addend field. We've
just deleted one. */
if (irelcount->r_addend == 0)
{
((*_bfd_error_handler) (_("%s: 0x%lx: warning: bad count"),
bfd_get_filename (abfd),
(unsigned long) paddr));
continue;
}
--irelcount->r_addend;
/* If there are no more uses, we can delete the address. Reload
the address from irelfn, in case it was changed by the
previous call to sh_elf_relax_delete_bytes. */
if (irelcount->r_addend == 0)
{
if (! sh_elf_relax_delete_bytes (abfd, sec, irelfn->r_offset, 4))
goto error_return;
}
/* We've done all we can with that function call. */
}
/* Look for load and store instructions that we can align on four
byte boundaries. */
if (have_code)
{
boolean swapped;
/* Get the section contents. */
if (contents == NULL)
{
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
else
{
contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
if (contents == NULL)
goto error_return;
free_contents = contents;
if (! bfd_get_section_contents (abfd, sec, contents,
(file_ptr) 0, sec->_raw_size))
goto error_return;
}
}
if (! sh_elf_align_loads (abfd, sec, internal_relocs, contents,
&swapped))
goto error_return;
if (swapped)
{
elf_section_data (sec)->relocs = internal_relocs;
free_relocs = NULL;
elf_section_data (sec)->this_hdr.contents = contents;
free_contents = NULL;
symtab_hdr->contents = (bfd_byte *) extsyms;
free_extsyms = 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 (sec)->this_hdr.contents = contents;
}
free_contents = NULL;
}
if (free_extsyms != NULL)
{
if (! link_info->keep_memory)
free (free_extsyms);
else
{
/* Cache the symbols for elf_link_input_bfd. */
symtab_hdr->contents = extsyms;
}
free_extsyms = NULL;
}
return true;
error_return:
if (free_relocs != NULL)
free (free_relocs);
if (free_contents != NULL)
free (free_contents);
if (free_extsyms != NULL)
free (free_extsyms);
return false;
}
/* Delete some bytes from a section while relaxing. FIXME: There is a
lot of duplication between this function and sh_relax_delete_bytes
in coff-sh.c. */
static boolean
sh_elf_relax_delete_bytes (abfd, sec, addr, count)
bfd *abfd;
asection *sec;
bfd_vma addr;
int count;
{
Elf_Internal_Shdr *symtab_hdr;
Elf32_External_Sym *extsyms;
int shndx, index;
bfd_byte *contents;
Elf_Internal_Rela *irel, *irelend;
Elf_Internal_Rela *irelalign;
bfd_vma toaddr;
Elf32_External_Sym *esym, *esymend;
struct elf_link_hash_entry *sym_hash;
asection *o;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
contents = elf_section_data (sec)->this_hdr.contents;
/* The deletion must stop at the next ALIGN reloc for an aligment
power larger than the number of bytes we are deleting. */
irelalign = NULL;
toaddr = sec->_cooked_size;
irel = elf_section_data (sec)->relocs;
irelend = irel + sec->reloc_count;
for (; irel < irelend; irel++)
{
if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN
&& irel->r_offset > addr
&& count < (1 << irel->r_addend))
{
irelalign = irel;
toaddr = irel->r_offset;
break;
}
}
/* Actually delete the bytes. */
memmove (contents + addr, contents + addr + count, toaddr - addr - count);
if (irelalign == NULL)
sec->_cooked_size -= count;
else
{
int i;
#define NOP_OPCODE (0x0009)
BFD_ASSERT ((count & 1) == 0);
for (i = 0; i < count; i += 2)
bfd_put_16 (abfd, NOP_OPCODE, contents + toaddr - count + i);
}
/* Adjust all the relocs. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
{
bfd_vma nraddr, stop;
bfd_vma start = 0;
int insn = 0;
Elf_Internal_Sym sym;
int off, adjust, oinsn;
bfd_signed_vma voff = 0;
boolean overflow;
/* Get the new reloc address. */
nraddr = irel->r_offset;
if ((irel->r_offset > addr
&& irel->r_offset < toaddr)
|| (ELF32_R_TYPE (irel->r_info) == (int) R_SH_ALIGN
&& irel->r_offset == toaddr))
nraddr -= count;
/* See if this reloc was for the bytes we have deleted, in which
case we no longer care about it. Don't delete relocs which
represent addresses, though. */
if (irel->r_offset >= addr
&& irel->r_offset < addr + count
&& ELF32_R_TYPE (irel->r_info) != (int) R_SH_ALIGN
&& ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE
&& ELF32_R_TYPE (irel->r_info) != (int) R_SH_DATA
&& ELF32_R_TYPE (irel->r_info) != (int) R_SH_LABEL)
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
(int) R_SH_NONE);
/* If this is a PC relative reloc, see if the range it covers
includes the bytes we have deleted. */
switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info))
{
default:
break;
case R_SH_DIR8WPN:
case R_SH_IND12W:
case R_SH_DIR8WPZ:
case R_SH_DIR8WPL:
start = irel->r_offset;
insn = bfd_get_16 (abfd, contents + nraddr);
break;
}
switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info))
{
default:
start = stop = addr;
break;
case R_SH_DIR32:
/* If this reloc is against a symbol defined in this
section, and the symbol will not be adjusted below, we
must check the addend to see it will put the value in
range to be adjusted, and hence must be changed. */
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
{
bfd_elf32_swap_symbol_in (abfd,
extsyms + ELF32_R_SYM (irel->r_info),
&sym);
if (sym.st_shndx == shndx
&& (sym.st_value <= addr
|| sym.st_value >= toaddr))
{
bfd_vma val;
val = bfd_get_32 (abfd, contents + nraddr);
val += sym.st_value;
if (val > addr && val < toaddr)
bfd_put_32 (abfd, val - count, contents + nraddr);
}
}
start = stop = addr;
break;
case R_SH_DIR8WPN:
off = insn & 0xff;
if (off & 0x80)
off -= 0x100;
stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2);
break;
case R_SH_IND12W:
if (ELF32_R_SYM (irel->r_info) >= symtab_hdr->sh_info)
start = stop = addr;
else
{
off = insn & 0xfff;
if (off & 0x800)
off -= 0x1000;
stop = (bfd_vma) ((bfd_signed_vma) start + 4 + off * 2);
}
break;
case R_SH_DIR8WPZ:
off = insn & 0xff;
stop = start + 4 + off * 2;
break;
case R_SH_DIR8WPL:
off = insn & 0xff;
stop = (start & ~(bfd_vma) 3) + 4 + off * 4;
break;
case R_SH_SWITCH8:
case R_SH_SWITCH16:
case R_SH_SWITCH32:
/* These relocs types represent
.word L2-L1
The r_addend field holds the difference between the reloc
address and L1. That is the start of the reloc, and
adding in the contents gives us the top. We must adjust
both the r_offset field and the section contents.
N.B. in gas / coff bfd, the elf bfd r_addend is called r_offset,
and the elf bfd r_offset is called r_vaddr. */
stop = irel->r_offset;
start = (bfd_vma) ((bfd_signed_vma) stop - (long) irel->r_addend);
if (start > addr
&& start < toaddr
&& (stop <= addr || stop >= toaddr))
irel->r_addend += count;
else if (stop > addr
&& stop < toaddr
&& (start <= addr || start >= toaddr))
irel->r_addend -= count;
if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH16)
voff = bfd_get_signed_16 (abfd, contents + nraddr);
else if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_SWITCH8)
voff = bfd_get_8 (abfd, contents + nraddr);
else
voff = bfd_get_signed_32 (abfd, contents + nraddr);
stop = (bfd_vma) ((bfd_signed_vma) start + voff);
break;
case R_SH_USES:
start = irel->r_offset;
stop = (bfd_vma) ((bfd_signed_vma) start
+ (long) irel->r_addend
+ 4);
break;
}
if (start > addr
&& start < toaddr
&& (stop <= addr || stop >= toaddr))
adjust = count;
else if (stop > addr
&& stop < toaddr
&& (start <= addr || start >= toaddr))
adjust = - count;
else
adjust = 0;
if (adjust != 0)
{
oinsn = insn;
overflow = false;
switch ((enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info))
{
default:
abort ();
break;
case R_SH_DIR8WPN:
case R_SH_DIR8WPZ:
insn += adjust / 2;
if ((oinsn & 0xff00) != (insn & 0xff00))
overflow = true;
bfd_put_16 (abfd, insn, contents + nraddr);
break;
case R_SH_IND12W:
insn += adjust / 2;
if ((oinsn & 0xf000) != (insn & 0xf000))
overflow = true;
bfd_put_16 (abfd, insn, contents + nraddr);
break;
case R_SH_DIR8WPL:
BFD_ASSERT (adjust == count || count >= 4);
if (count >= 4)
insn += adjust / 4;
else
{
if ((irel->r_offset & 3) == 0)
++insn;
}
if ((oinsn & 0xff00) != (insn & 0xff00))
overflow = true;
bfd_put_16 (abfd, insn, contents + nraddr);
break;
case R_SH_SWITCH8:
voff += adjust;
if (voff < 0 || voff >= 0xff)
overflow = true;
bfd_put_8 (abfd, voff, contents + nraddr);
break;
case R_SH_SWITCH16:
voff += adjust;
if (voff < - 0x8000 || voff >= 0x8000)
overflow = true;
bfd_put_signed_16 (abfd, voff, contents + nraddr);
break;
case R_SH_SWITCH32:
voff += adjust;
bfd_put_signed_32 (abfd, voff, contents + nraddr);
break;
case R_SH_USES:
irel->r_addend += adjust;
break;
}
if (overflow)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: fatal: reloc overflow while relaxing"),
bfd_get_filename (abfd), (unsigned long) irel->r_offset));
bfd_set_error (bfd_error_bad_value);
return false;
}
}
irel->r_offset = nraddr;
}
/* Look through all the other sections. If there contain any IMM32
relocs against internal symbols which we are not going to adjust
below, we may need to adjust the addends. */
for (o = abfd->sections; o != NULL; o = o->next)
{
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irelscan, *irelscanend;
bfd_byte *ocontents;
if (o == sec
|| (o->flags & SEC_RELOC) == 0
|| o->reloc_count == 0)
continue;
/* We always cache the relocs. Perhaps, if info->keep_memory is
false, we should free them, if we are permitted to, when we
leave sh_coff_relax_section. */
internal_relocs = (_bfd_elf32_link_read_relocs
(abfd, o, (PTR) NULL, (Elf_Internal_Rela *) NULL,
true));
if (internal_relocs == NULL)
return false;
ocontents = NULL;
irelscanend = internal_relocs + o->reloc_count;
for (irelscan = internal_relocs; irelscan < irelscanend; irelscan++)
{
Elf_Internal_Sym sym;
/* Dwarf line numbers use R_SH_SWITCH32 relocs. */
if (ELF32_R_TYPE (irelscan->r_info) == (int) R_SH_SWITCH32)
{
bfd_vma start, stop;
bfd_signed_vma voff;
if (ocontents == NULL)
{
if (elf_section_data (o)->this_hdr.contents != NULL)
ocontents = elf_section_data (o)->this_hdr.contents;
else
{
/* We always cache the section contents.
Perhaps, if info->keep_memory is false, we
should free them, if we are permitted to,
when we leave sh_coff_relax_section. */
ocontents = (bfd_byte *) bfd_malloc (o->_raw_size);
if (ocontents == NULL)
return false;
if (! bfd_get_section_contents (abfd, o, ocontents,
(file_ptr) 0,
o->_raw_size))
return false;
elf_section_data (o)->this_hdr.contents = ocontents;
}
}
stop = irelscan->r_offset;
start
= (bfd_vma) ((bfd_signed_vma) stop - (long) irelscan->r_addend);
/* STOP is in a different section, so it won't change. */
if (start > addr && start < toaddr)
irelscan->r_addend += count;
voff = bfd_get_signed_32 (abfd, ocontents + irelscan->r_offset);
stop = (bfd_vma) ((bfd_signed_vma) start + voff);
if (start > addr
&& start < toaddr
&& (stop <= addr || stop >= toaddr))
bfd_put_signed_32 (abfd, voff + count,
ocontents + irelscan->r_offset);
else if (stop > addr
&& stop < toaddr
&& (start <= addr || start >= toaddr))
bfd_put_signed_32 (abfd, voff - count,
ocontents + irelscan->r_offset);
}
if (ELF32_R_TYPE (irelscan->r_info) != (int) R_SH_DIR32)
continue;
if (ELF32_R_SYM (irelscan->r_info) >= symtab_hdr->sh_info)
continue;
bfd_elf32_swap_symbol_in (abfd,
extsyms + ELF32_R_SYM (irelscan->r_info),
&sym);
if (sym.st_shndx == shndx
&& (sym.st_value <= addr
|| sym.st_value >= toaddr))
{
bfd_vma val;
if (ocontents == NULL)
{
if (elf_section_data (o)->this_hdr.contents != NULL)
ocontents = elf_section_data (o)->this_hdr.contents;
else
{
/* We always cache the section contents.
Perhaps, if info->keep_memory is false, we
should free them, if we are permitted to,
when we leave sh_coff_relax_section. */
ocontents = (bfd_byte *) bfd_malloc (o->_raw_size);
if (ocontents == NULL)
return false;
if (! bfd_get_section_contents (abfd, o, ocontents,
(file_ptr) 0,
o->_raw_size))
return false;
elf_section_data (o)->this_hdr.contents = ocontents;
}
}
val = bfd_get_32 (abfd, ocontents + irelscan->r_offset);
val += sym.st_value;
if (val > addr && val < toaddr)
bfd_put_32 (abfd, val - count,
ocontents + irelscan->r_offset);
}
}
}
/* Adjust the local symbols defined in this section. */
esym = extsyms;
esymend = esym + symtab_hdr->sh_info;
for (; esym < esymend; esym++)
{
Elf_Internal_Sym isym;
bfd_elf32_swap_symbol_in (abfd, esym, &isym);
if (isym.st_shndx == shndx
&& isym.st_value > addr
&& isym.st_value < toaddr)
{
isym.st_value -= count;
bfd_elf32_swap_symbol_out (abfd, &isym, esym);
}
}
/* Now adjust the global symbols defined in this section. */
esym = extsyms + symtab_hdr->sh_info;
esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym));
for (index = 0; esym < esymend; esym++, index++)
{
Elf_Internal_Sym isym;
bfd_elf32_swap_symbol_in (abfd, esym, &isym);
sym_hash = elf_sym_hashes (abfd)[index];
if (isym.st_shndx == shndx
&& ((sym_hash)->root.type == bfd_link_hash_defined
|| (sym_hash)->root.type == bfd_link_hash_defweak)
&& (sym_hash)->root.u.def.section == sec
&& (sym_hash)->root.u.def.value > addr
&& (sym_hash)->root.u.def.value < toaddr)
{
(sym_hash)->root.u.def.value -= count;
}
}
/* See if we can move the ALIGN reloc forward. We have adjusted
r_offset for it already. */
if (irelalign != NULL)
{
bfd_vma alignto, alignaddr;
alignto = BFD_ALIGN (toaddr, 1 << irelalign->r_addend);
alignaddr = BFD_ALIGN (irelalign->r_offset,
1 << irelalign->r_addend);
if (alignto != alignaddr)
{
/* Tail recursion. */
return sh_elf_relax_delete_bytes (abfd, sec, alignaddr,
alignto - alignaddr);
}
}
return true;
}
/* Look for loads and stores which we can align to four byte
boundaries. This is like sh_align_loads in coff-sh.c. */
static boolean
sh_elf_align_loads (abfd, sec, internal_relocs, contents, pswapped)
bfd *abfd;
asection *sec;
Elf_Internal_Rela *internal_relocs;
bfd_byte *contents;
boolean *pswapped;
{
Elf_Internal_Rela *irel, *irelend;
bfd_vma *labels = NULL;
bfd_vma *label, *label_end;
*pswapped = false;
irelend = internal_relocs + sec->reloc_count;
/* Get all the addresses with labels on them. */
labels = (bfd_vma *) bfd_malloc (sec->reloc_count * sizeof (bfd_vma));
if (labels == NULL)
goto error_return;
label_end = labels;
for (irel = internal_relocs; irel < irelend; irel++)
{
if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_LABEL)
{
*label_end = irel->r_offset;
++label_end;
}
}
/* Note that the assembler currently always outputs relocs in
address order. If that ever changes, this code will need to sort
the label values and the relocs. */
label = labels;
for (irel = internal_relocs; irel < irelend; irel++)
{
bfd_vma start, stop;
if (ELF32_R_TYPE (irel->r_info) != (int) R_SH_CODE)
continue;
start = irel->r_offset;
for (irel++; irel < irelend; irel++)
if (ELF32_R_TYPE (irel->r_info) == (int) R_SH_DATA)
break;
if (irel < irelend)
stop = irel->r_offset;
else
stop = sec->_cooked_size;
if (! _bfd_sh_align_load_span (abfd, sec, contents, sh_elf_swap_insns,
(PTR) internal_relocs, &label,
label_end, start, stop, pswapped))
goto error_return;
}
free (labels);
return true;
error_return:
if (labels != NULL)
free (labels);
return false;
}
/* Swap two SH instructions. This is like sh_swap_insns in coff-sh.c. */
static boolean
sh_elf_swap_insns (abfd, sec, relocs, contents, addr)
bfd *abfd;
asection *sec;
PTR relocs;
bfd_byte *contents;
bfd_vma addr;
{
Elf_Internal_Rela *internal_relocs = (Elf_Internal_Rela *) relocs;
unsigned short i1, i2;
Elf_Internal_Rela *irel, *irelend;
/* Swap the instructions themselves. */
i1 = bfd_get_16 (abfd, contents + addr);
i2 = bfd_get_16 (abfd, contents + addr + 2);
bfd_put_16 (abfd, i2, contents + addr);
bfd_put_16 (abfd, i1, contents + addr + 2);
/* Adjust all reloc addresses. */
irelend = internal_relocs + sec->reloc_count;
for (irel = internal_relocs; irel < irelend; irel++)
{
enum elf_sh_reloc_type type;
int add;
/* There are a few special types of relocs that we don't want to
adjust. These relocs do not apply to the instruction itself,
but are only associated with the address. */
type = (enum elf_sh_reloc_type) ELF32_R_TYPE (irel->r_info);
if (type == R_SH_ALIGN
|| type == R_SH_CODE
|| type == R_SH_DATA
|| type == R_SH_LABEL)
continue;
/* If an R_SH_USES reloc points to one of the addresses being
swapped, we must adjust it. It would be incorrect to do this
for a jump, though, since we want to execute both
instructions after the jump. (We have avoided swapping
around a label, so the jump will not wind up executing an
instruction it shouldn't). */
if (type == R_SH_USES)
{
bfd_vma off;
off = irel->r_offset + 4 + irel->r_addend;
if (off == addr)
irel->r_offset += 2;
else if (off == addr + 2)
irel->r_offset -= 2;
}
if (irel->r_offset == addr)
{
irel->r_offset += 2;
add = -2;
}
else if (irel->r_offset == addr + 2)
{
irel->r_offset -= 2;
add = 2;
}
else
add = 0;
if (add != 0)
{
bfd_byte *loc;
unsigned short insn, oinsn;
boolean overflow;
loc = contents + irel->r_offset;
overflow = false;
switch (type)
{
default:
break;
case R_SH_DIR8WPN:
case R_SH_DIR8WPZ:
insn = bfd_get_16 (abfd, loc);
oinsn = insn;
insn += add / 2;
if ((oinsn & 0xff00) != (insn & 0xff00))
overflow = true;
bfd_put_16 (abfd, insn, loc);
break;
case R_SH_IND12W:
insn = bfd_get_16 (abfd, loc);
oinsn = insn;
insn += add / 2;
if ((oinsn & 0xf000) != (insn & 0xf000))
overflow = true;
bfd_put_16 (abfd, insn, loc);
break;
case R_SH_DIR8WPL:
/* This reloc ignores the least significant 3 bits of
the program counter before adding in the offset.
This means that if ADDR is at an even address, the
swap will not affect the offset. If ADDR is an at an
odd address, then the instruction will be crossing a
four byte boundary, and must be adjusted. */
if ((addr & 3) != 0)
{
insn = bfd_get_16 (abfd, loc);
oinsn = insn;
insn += add / 2;
if ((oinsn & 0xff00) != (insn & 0xff00))
overflow = true;
bfd_put_16 (abfd, insn, loc);
}
break;
}
if (overflow)
{
((*_bfd_error_handler)
(_("%s: 0x%lx: fatal: reloc overflow while relaxing"),
bfd_get_filename (abfd), (unsigned long) irel->r_offset));
bfd_set_error (bfd_error_bad_value);
return false;
}
}
}
return true;
}
/* The size in bytes of an entry in the procedure linkage table. */
#define PLT_ENTRY_SIZE 28
/* First entry in an absolute procedure linkage table look like this. */
static const bfd_byte elf_sh_plt0_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x04, /* mov.l 1f,r0 */
0xd2, 0x05, /* mov.l 2f,r2 */
0x60, 0x02, /* mov.l @r0,r0 */
0x62, 0x22, /* mov.l @r2,r2 */
0x40, 0x2b, /* jmp @r0 */
0xe0, 0x00, /* mov #0,r0 */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
};
static const bfd_byte elf_sh_plt0_entry_le[PLT_ENTRY_SIZE] =
{
0x04, 0xd0, /* mov.l 1f,r0 */
0x05, 0xd2, /* mov.l 2f,r2 */
0x02, 0x60, /* mov.l @r0,r0 */
0x22, 0x62, /* mov.l @r2,r2 */
0x2b, 0x40, /* jmp @r0 */
0x00, 0xe0, /* mov #0,r0 */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 1: replaced with address of .got.plt + 8. */
0, 0, 0, 0, /* 2: replaced with address of .got.plt + 4. */
};
/* Sebsequent entries in an absolute procedure linkage table look like
this. */
static const bfd_byte elf_sh_plt_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x04, /* mov.l 1f,r0 */
0x60, 0x02, /* mov.l @r0,r0 */
0xd2, 0x02, /* mov.l 0f,r2 */
0x40, 0x2b, /* jmp @r0 */
0x60, 0x23, /* mov r2,r0 */
0xd1, 0x03, /* mov.l 2f,r1 */
0x40, 0x2b, /* jmp @r0 */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 0: replaced with address of .PLT0. */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
};
static const bfd_byte elf_sh_plt_entry_le[PLT_ENTRY_SIZE] =
{
0x04, 0xd0, /* mov.l 1f,r0 */
0x02, 0x60, /* mov.l @r0,r0 */
0x02, 0xd2, /* mov.l 0f,r2 */
0x2b, 0x40, /* jmp @r0 */
0x23, 0x60, /* mov r2,r0 */
0x03, 0xd1, /* mov.l 2f,r1 */
0x2b, 0x40, /* jmp @r0 */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 0: replaced with address of .PLT. */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0, /* 2: replaced with offset into relocation table. */
};
/* Entries in a PIC procedure linkage table look like this. */
static const bfd_byte elf_sh_pic_plt_entry_be[PLT_ENTRY_SIZE] =
{
0xd0, 0x04, /* mov.l 1f,r0 */
0x00, 0xce, /* mov.l @(r0,r12),r0 */
0x40, 0x2b, /* jmp @r0 */
0x00, 0x09, /* nop */
0x50, 0xc2, /* 0: mov.l @(8,r12),r0 */
0x52, 0xc1, /* 1: mov.l @(4,r12),r2 */
0xd1, 0x02, /* mov.l 2f,r1 */
0x40, 0x2b, /* jmp @r0 */
0xe0, 0x00, /* mov #0,r0 ! shows the type of PLT. */
0x00, 0x09, /* nop */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
};
static const bfd_byte elf_sh_pic_plt_entry_le[PLT_ENTRY_SIZE] =
{
0x04, 0xd0, /* mov.l 1f,r0 */
0xce, 0x00, /* mov.l @(r0,r12),r0 */
0x2b, 0x40, /* jmp @r0 */
0x09, 0x00, /* nop */
0xc2, 0x50, /* 0: mov.l @(8,r12),r0 */
0xc1, 0x52, /* 1: mov.l @(4,r12),r2 */
0x02, 0xd1, /* mov.l 2f,r1 */
0x2b, 0x40, /* jmp @r0 */
0x00, 0xe0, /* mov #0,r0 ! shows the type of PLT. */
0x09, 0x00, /* nop */
0, 0, 0, 0, /* 1: replaced with address of this symbol in .got. */
0, 0, 0, 0 /* 2: replaced with offset into relocation table. */
};
static const bfd_byte *elf_sh_plt0_entry;
static const bfd_byte *elf_sh_plt_entry;
static const bfd_byte *elf_sh_pic_plt_entry;
/* Return size of a PLT entry. */
#define elf_sh_sizeof_plt(info) PLT_ENTRY_SIZE
/* Return offset of the PLT0 address in an absolute PLT entry. */
#define elf_sh_plt_plt0_offset(info) 16
/* Return offset of the linker in PLT0 entry. */
#define elf_sh_plt0_linker_offset(info) 20
/* Return offset of the GOT id in PLT0 entry. */
#define elf_sh_plt0_gotid_offset(info) 24
/* Return offset of the tempoline in PLT entry */
#define elf_sh_plt_temp_offset(info) 8
/* Return offset of the symbol in PLT entry. */
#define elf_sh_plt_symbol_offset(info) 20
/* Return offset of the relocation in PLT entry. */
#define elf_sh_plt_reloc_offset(info) 24
/* The sh linker needs to keep track of the number of relocs that it
decides to copy in check_relocs for each symbol. This is so that
it can discard PC relative relocs if it doesn't need them when
linking with -Bsymbolic. We store the information in a field
extending the regular ELF linker hash table. */
/* This structure keeps track of the number of PC relative relocs we
have copied for a given symbol. */
struct elf_sh_pcrel_relocs_copied
{
/* Next section. */
struct elf_sh_pcrel_relocs_copied *next;
/* A section in dynobj. */
asection *section;
/* Number of relocs copied in this section. */
bfd_size_type count;
};
/* sh ELF linker hash entry. */
struct elf_sh_link_hash_entry
{
struct elf_link_hash_entry root;
/* Number of PC relative relocs copied for this symbol. */
struct elf_sh_pcrel_relocs_copied *pcrel_relocs_copied;
};
/* sh ELF linker hash table. */
struct elf_sh_link_hash_table
{
struct elf_link_hash_table root;
};
/* Declare this now that the above structures are defined. */
static boolean sh_elf_discard_copies
PARAMS ((struct elf_sh_link_hash_entry *, PTR));
/* Traverse an sh ELF linker hash table. */
#define sh_elf_link_hash_traverse(table, func, info) \
(elf_link_hash_traverse \
(&(table)->root, \
(boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
(info)))
/* Get the sh ELF linker hash table from a link_info structure. */
#define sh_elf_hash_table(p) \
((struct elf_sh_link_hash_table *) ((p)->hash))
/* Create an entry in an sh ELF linker hash table. */
static struct bfd_hash_entry *
sh_elf_link_hash_newfunc (entry, table, string)
struct bfd_hash_entry *entry;
struct bfd_hash_table *table;
const char *string;
{
struct elf_sh_link_hash_entry *ret =
(struct elf_sh_link_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == (struct elf_sh_link_hash_entry *) NULL)
ret = ((struct elf_sh_link_hash_entry *)
bfd_hash_allocate (table,
sizeof (struct elf_sh_link_hash_entry)));
if (ret == (struct elf_sh_link_hash_entry *) NULL)
return (struct bfd_hash_entry *) ret;
/* Call the allocation method of the superclass. */
ret = ((struct elf_sh_link_hash_entry *)
_bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
table, string));
if (ret != (struct elf_sh_link_hash_entry *) NULL)
{
ret->pcrel_relocs_copied = NULL;
}
return (struct bfd_hash_entry *) ret;
}
/* Create an sh ELF linker hash table. */
static struct bfd_link_hash_table *
sh_elf_link_hash_table_create (abfd)
bfd *abfd;
{
struct elf_sh_link_hash_table *ret;
ret = ((struct elf_sh_link_hash_table *)
bfd_alloc (abfd, sizeof (struct elf_sh_link_hash_table)));
if (ret == (struct elf_sh_link_hash_table *) NULL)
return NULL;
if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
sh_elf_link_hash_newfunc))
{
bfd_release (abfd, ret);
return NULL;
}
return &ret->root.root;
}
/* Create dynamic sections when linking against a dynamic object. */
static boolean
sh_elf_create_dynamic_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
flagword flags, pltflags;
register asection *s;
struct elf_backend_data *bed = get_elf_backend_data (abfd);
int ptralign = 0;
switch (bed->s->arch_size)
{
case 32:
ptralign = 2;
break;
case 64:
ptralign = 3;
break;
default:
bfd_set_error (bfd_error_bad_value);
return false;
}
/* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
.rel[a].bss sections. */
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
pltflags = flags;
pltflags |= SEC_CODE;
if (bed->plt_not_loaded)
pltflags &= ~ (SEC_LOAD | SEC_HAS_CONTENTS);
if (bed->plt_readonly)
pltflags |= SEC_READONLY;
s = bfd_make_section (abfd, ".plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, pltflags)
|| ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
return false;
if (bed->want_plt_sym)
{
/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
.plt section. */
struct elf_link_hash_entry *h = NULL;
if (! (_bfd_generic_link_add_one_symbol
(info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s,
(bfd_vma) 0, (const char *) NULL, false,
get_elf_backend_data (abfd)->collect,
(struct bfd_link_hash_entry **) &h)))
return false;
h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
h->type = STT_OBJECT;
if (info->shared
&& ! _bfd_elf_link_record_dynamic_symbol (info, h))
return false;
}
s = bfd_make_section (abfd,
bed->default_use_rela_p ? ".rela.plt" : ".rel.plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, ptralign))
return false;
if (! _bfd_elf_create_got_section (abfd, info))
return false;
{
const char *secname;
char *relname;
flagword secflags;
asection *sec;
for (sec = abfd->sections; sec; sec = sec->next)
{
secflags = bfd_get_section_flags (abfd, sec);
if ((secflags & (SEC_DATA | SEC_LINKER_CREATED))
|| ((secflags & SEC_HAS_CONTENTS) != SEC_HAS_CONTENTS))
continue;
secname = bfd_get_section_name (abfd, sec);
relname = (char *) bfd_malloc (strlen (secname) + 6);
strcpy (relname, ".rela");
strcat (relname, secname);
s = bfd_make_section (abfd, relname);
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, ptralign))
return false;
}
}
if (bed->want_dynbss)
{
/* The .dynbss section is a place to put symbols which are defined
by dynamic objects, are referenced by regular objects, and are
not functions. We must allocate space for them in the process
image and use a R_*_COPY reloc to tell the dynamic linker to
initialize them at run time. The linker script puts the .dynbss
section into the .bss section of the final image. */
s = bfd_make_section (abfd, ".dynbss");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
return false;
/* The .rel[a].bss section holds copy relocs. This section is not
normally needed. We need to create it here, though, so that the
linker will map it to an output section. We can't just create it
only if we need it, because we will not know whether we need it
until we have seen all the input files, and the first time the
main linker code calls BFD after examining all the input files
(size_dynamic_sections) the input sections have already been
mapped to the output sections. If the section turns out not to
be needed, we can discard it later. We will never need this
section when generating a shared object, since they do not use
copy relocs. */
if (! info->shared)
{
s = bfd_make_section (abfd,
(bed->default_use_rela_p
? ".rela.bss" : ".rel.bss"));
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
|| ! bfd_set_section_alignment (abfd, s, ptralign))
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
sh_elf_adjust_dynamic_symbol (info, h)
struct bfd_link_info *info;
struct elf_link_hash_entry *h;
{
bfd *dynobj;
asection *s;
unsigned int power_of_two;
dynobj = elf_hash_table (info)->dynobj;
/* 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 PLT 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 REL32
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_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 = s->_raw_size;
}
h->plt.offset = s->_raw_size;
/* Make room for this entry. */
s->_raw_size += elf_sh_sizeof_plt (info);
/* We also need to make an entry in the .got.plt section, which
will be placed in the .got section by the linker script. */
s = bfd_get_section_by_name (dynobj, ".got.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += 4;
/* 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;
/* If there are no references to this symbol that do not use the
GOT, we don't need to generate a copy reloc. */
if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
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);
/* We must generate a R_SH_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;
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 > 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;
}
/* Set the sizes of the dynamic sections. */
static boolean
sh_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;
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 section.
However, if we are not creating the dynamic sections, we will
not actually use these entries. Reset the size of .rela.got,
which will cause it to get stripped from the output file
below. */
s = bfd_get_section_by_name (dynobj, ".rela.got");
if (s != NULL)
s->_raw_size = 0;
}
/* If this is a -Bsymbolic shared link, then we need to discard all
PC relative relocs against symbols defined in a regular object.
We allocated space for them in the check_relocs routine, but we
will not fill them in in the relocate_section routine. */
if (info->shared && info->symbolic)
sh_elf_link_hash_traverse (sh_elf_hash_table (info),
sh_elf_discard_copies,
(PTR) NULL);
/* 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;
/* Remember whether there are any reloc sections other
than .rela.plt. */
if (strcmp (name, ".rela.plt") != 0)
{
const char *outname;
relocs = true;
/* If this relocation section applies to a read only
section, then we probably need a DT_TEXTREL
entry. The entries in the .rela.plt section
really apply to the .got section, which we
created ourselves and so know is not readonly. */
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 (strncmp (name, ".got", 4) != 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_alloc (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 sh_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. */