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/* Alpha specific support for 64-bit ELF
Copyright 1996, 1997, 1998, 1999, 2000, 2001
Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@tamu.edu>.
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. */
/* We need a published ABI spec for this. Until one comes out, don't
assume this'll remain unchanged forever. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/alpha.h"
#define ALPHAECOFF
#define NO_COFF_RELOCS
#define NO_COFF_SYMBOLS
#define NO_COFF_LINENOS
/* Get the ECOFF swapping routines. Needed for the debug information. */
#include "coff/internal.h"
#include "coff/sym.h"
#include "coff/symconst.h"
#include "coff/ecoff.h"
#include "coff/alpha.h"
#include "aout/ar.h"
#include "libcoff.h"
#include "libecoff.h"
#define ECOFF_64
#include "ecoffswap.h"
static int alpha_elf_dynamic_symbol_p
PARAMS((struct elf_link_hash_entry *, struct bfd_link_info *));
static struct bfd_hash_entry * elf64_alpha_link_hash_newfunc
PARAMS((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
static struct bfd_link_hash_table * elf64_alpha_bfd_link_hash_table_create
PARAMS((bfd *));
static bfd_reloc_status_type elf64_alpha_reloc_nil
PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_reloc_status_type elf64_alpha_reloc_bad
PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_reloc_status_type elf64_alpha_do_reloc_gpdisp
PARAMS((bfd *, bfd_vma, bfd_byte *, bfd_byte *));
static bfd_reloc_status_type elf64_alpha_reloc_gpdisp
PARAMS((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type * elf64_alpha_bfd_reloc_type_lookup
PARAMS((bfd *, bfd_reloc_code_real_type));
static void elf64_alpha_info_to_howto
PARAMS((bfd *, arelent *, Elf64_Internal_Rela *));
static boolean elf64_alpha_mkobject
PARAMS((bfd *));
static boolean elf64_alpha_object_p
PARAMS((bfd *));
static boolean elf64_alpha_section_from_shdr
PARAMS((bfd *, Elf64_Internal_Shdr *, char *));
static boolean elf64_alpha_fake_sections
PARAMS((bfd *, Elf64_Internal_Shdr *, asection *));
static boolean elf64_alpha_create_got_section
PARAMS((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_create_dynamic_sections
PARAMS((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_read_ecoff_info
PARAMS((bfd *, asection *, struct ecoff_debug_info *));
static boolean elf64_alpha_is_local_label_name
PARAMS((bfd *, const char *));
static boolean elf64_alpha_find_nearest_line
PARAMS((bfd *, asection *, asymbol **, bfd_vma, const char **,
const char **, unsigned int *));
#if defined(__STDC__) || defined(ALMOST_STDC)
struct alpha_elf_link_hash_entry;
#endif
static boolean elf64_alpha_output_extsym
PARAMS((struct alpha_elf_link_hash_entry *, PTR));
static boolean elf64_alpha_can_merge_gots
PARAMS((bfd *, bfd *));
static void elf64_alpha_merge_gots
PARAMS((bfd *, bfd *));
static boolean elf64_alpha_calc_got_offsets_for_symbol
PARAMS ((struct alpha_elf_link_hash_entry *, PTR));
static void elf64_alpha_calc_got_offsets PARAMS ((struct bfd_link_info *));
static boolean elf64_alpha_size_got_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_always_size_sections
PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_calc_dynrel_sizes
PARAMS ((struct alpha_elf_link_hash_entry *, struct bfd_link_info *));
static boolean elf64_alpha_add_symbol_hook
PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
const char **, flagword *, asection **, bfd_vma *));
static boolean elf64_alpha_check_relocs
PARAMS((bfd *, struct bfd_link_info *, asection *sec,
const Elf_Internal_Rela *));
static boolean elf64_alpha_adjust_dynamic_symbol
PARAMS((struct bfd_link_info *, struct elf_link_hash_entry *));
static boolean elf64_alpha_size_dynamic_sections
PARAMS((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_relocate_section
PARAMS((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean elf64_alpha_finish_dynamic_symbol
PARAMS((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
Elf_Internal_Sym *));
static boolean elf64_alpha_finish_dynamic_sections
PARAMS((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_final_link
PARAMS((bfd *, struct bfd_link_info *));
static boolean elf64_alpha_merge_ind_symbols
PARAMS((struct alpha_elf_link_hash_entry *, PTR));
static Elf_Internal_Rela * elf64_alpha_find_reloc_at_ofs
PARAMS ((Elf_Internal_Rela *, Elf_Internal_Rela *, bfd_vma, int));
struct alpha_elf_link_hash_entry
{
struct elf_link_hash_entry root;
/* External symbol information. */
EXTR esym;
/* Cumulative flags for all the .got entries. */
int flags;
/* Contexts (LITUSE) in which a literal was referenced. */
#define ALPHA_ELF_LINK_HASH_LU_ADDR 0x01
#define ALPHA_ELF_LINK_HASH_LU_MEM 0x02
#define ALPHA_ELF_LINK_HASH_LU_BYTE 0x04
#define ALPHA_ELF_LINK_HASH_LU_FUNC 0x08
/* Used to implement multiple .got subsections. */
struct alpha_elf_got_entry
{
struct alpha_elf_got_entry *next;
/* which .got subsection? */
bfd *gotobj;
/* the addend in effect for this entry. */
bfd_vma addend;
/* the .got offset for this entry. */
int got_offset;
int flags;
/* An additional flag. */
#define ALPHA_ELF_GOT_ENTRY_RELOCS_DONE 0x10
int use_count;
} *got_entries;
/* used to count non-got, non-plt relocations for delayed sizing
of relocation sections. */
struct alpha_elf_reloc_entry
{
struct alpha_elf_reloc_entry *next;
/* which .reloc section? */
asection *srel;
/* what kind of relocation? */
unsigned long rtype;
/* how many did we find? */
unsigned long count;
} *reloc_entries;
};
/* Alpha ELF linker hash table. */
struct alpha_elf_link_hash_table
{
struct elf_link_hash_table root;
/* The head of a list of .got subsections linked through
alpha_elf_tdata(abfd)->got_link_next. */
bfd *got_list;
};
/* Look up an entry in a Alpha ELF linker hash table. */
#define alpha_elf_link_hash_lookup(table, string, create, copy, follow) \
((struct alpha_elf_link_hash_entry *) \
elf_link_hash_lookup (&(table)->root, (string), (create), \
(copy), (follow)))
/* Traverse a Alpha ELF linker hash table. */
#define alpha_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 Alpha ELF linker hash table from a link_info structure. */
#define alpha_elf_hash_table(p) \
((struct alpha_elf_link_hash_table *) ((p)->hash))
/* Get the object's symbols as our own entry type. */
#define alpha_elf_sym_hashes(abfd) \
((struct alpha_elf_link_hash_entry **)elf_sym_hashes(abfd))
/* Should we do dynamic things to this symbol? */
static int
alpha_elf_dynamic_symbol_p (h, info)
struct elf_link_hash_entry *h;
struct bfd_link_info *info;
{
if (h == NULL)
return false;
while (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning)
h = (struct elf_link_hash_entry *) h->root.u.i.link;
if (h->dynindx == -1)
return false;
if (h->root.type == bfd_link_hash_undefweak
|| h->root.type == bfd_link_hash_defweak)
return true;
switch (ELF_ST_VISIBILITY (h->other))
{
case STV_DEFAULT:
break;
case STV_HIDDEN:
case STV_INTERNAL:
return false;
case STV_PROTECTED:
if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)
return false;
break;
}
if ((info->shared && !info->symbolic)
|| ((h->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR))
== (ELF_LINK_HASH_DEF_DYNAMIC | ELF_LINK_HASH_REF_REGULAR)))
return true;
return false;
}
/* Create an entry in a Alpha ELF linker hash table. */
static struct bfd_hash_entry *
elf64_alpha_link_hash_newfunc (entry, table, string)
struct bfd_hash_entry *entry;
struct bfd_hash_table *table;
const char *string;
{
struct alpha_elf_link_hash_entry *ret =
(struct alpha_elf_link_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == (struct alpha_elf_link_hash_entry *) NULL)
ret = ((struct alpha_elf_link_hash_entry *)
bfd_hash_allocate (table,
sizeof (struct alpha_elf_link_hash_entry)));
if (ret == (struct alpha_elf_link_hash_entry *) NULL)
return (struct bfd_hash_entry *) ret;
/* Call the allocation method of the superclass. */
ret = ((struct alpha_elf_link_hash_entry *)
_bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
table, string));
if (ret != (struct alpha_elf_link_hash_entry *) NULL)
{
/* Set local fields. */
memset (&ret->esym, 0, sizeof (EXTR));
/* We use -2 as a marker to indicate that the information has
not been set. -1 means there is no associated ifd. */
ret->esym.ifd = -2;
ret->flags = 0;
ret->got_entries = NULL;
ret->reloc_entries = NULL;
}
return (struct bfd_hash_entry *) ret;
}
/* Create a Alpha ELF linker hash table. */
static struct bfd_link_hash_table *
elf64_alpha_bfd_link_hash_table_create (abfd)
bfd *abfd;
{
struct alpha_elf_link_hash_table *ret;
ret = ((struct alpha_elf_link_hash_table *)
bfd_zalloc (abfd, sizeof (struct alpha_elf_link_hash_table)));
if (ret == (struct alpha_elf_link_hash_table *) NULL)
return NULL;
if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
elf64_alpha_link_hash_newfunc))
{
bfd_release (abfd, ret);
return NULL;
}
return &ret->root.root;
}
/* We have some private fields hanging off of the elf_tdata structure. */
struct alpha_elf_obj_tdata
{
struct elf_obj_tdata root;
/* For every input file, these are the got entries for that object's
local symbols. */
struct alpha_elf_got_entry ** local_got_entries;
/* For every input file, this is the object that owns the got that
this input file uses. */
bfd *gotobj;
/* For every got, this is a linked list through the objects using this got */
bfd *in_got_link_next;
/* For every got, this is a link to the next got subsegment. */
bfd *got_link_next;
/* For every got, this is the section. */
asection *got;
/* For every got, this is it's total number of *entries*. */
int total_got_entries;
/* For every got, this is the sum of the number of *entries* required
to hold all of the member object's local got. */
int n_local_got_entries;
};
#define alpha_elf_tdata(abfd) \
((struct alpha_elf_obj_tdata *) (abfd)->tdata.any)
static boolean
elf64_alpha_mkobject (abfd)
bfd *abfd;
{
abfd->tdata.any = bfd_zalloc (abfd, sizeof (struct alpha_elf_obj_tdata));
if (abfd->tdata.any == NULL)
return false;
return true;
}
static boolean
elf64_alpha_object_p (abfd)
bfd *abfd;
{
/* Allocate our special target data. */
struct alpha_elf_obj_tdata *new_tdata;
new_tdata = bfd_zalloc (abfd, sizeof (struct alpha_elf_obj_tdata));
if (new_tdata == NULL)
return false;
new_tdata->root = *abfd->tdata.elf_obj_data;
abfd->tdata.any = new_tdata;
/* Set the right machine number for an Alpha ELF file. */
return bfd_default_set_arch_mach (abfd, bfd_arch_alpha, 0);
}
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
from smaller values. Start with zero, widen, *then* decrement. */
#define MINUS_ONE (((bfd_vma)0) - 1)
static reloc_howto_type elf64_alpha_howto_table[] =
{
HOWTO (R_ALPHA_NONE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_nil, /* special_function */
"NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* A 32 bit reference to a symbol. */
HOWTO (R_ALPHA_REFLONG, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"REFLONG", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* A 64 bit reference to a symbol. */
HOWTO (R_ALPHA_REFQUAD, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"REFQUAD", /* name */
false, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* A 32 bit GP relative offset. This is just like REFLONG except
that when the value is used the value of the gp register will be
added in. */
HOWTO (R_ALPHA_GPREL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"GPREL32", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Used for an instruction that refers to memory off the GP register. */
HOWTO (R_ALPHA_LITERAL, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"ELF_LITERAL", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* This reloc only appears immediately following an ELF_LITERAL reloc.
It identifies a use of the literal. The symbol index is special:
1 means the literal address is in the base register of a memory
format instruction; 2 means the literal address is in the byte
offset register of a byte-manipulation instruction; 3 means the
literal address is in the target register of a jsr instruction.
This does not actually do any relocation. */
HOWTO (R_ALPHA_LITUSE, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_nil, /* special_function */
"LITUSE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Load the gp register. This is always used for a ldah instruction
which loads the upper 16 bits of the gp register. The symbol
index of the GPDISP instruction is an offset in bytes to the lda
instruction that loads the lower 16 bits. The value to use for
the relocation is the difference between the GP value and the
current location; the load will always be done against a register
holding the current address.
NOTE: Unlike ECOFF, partial in-place relocation is not done. If
any offset is present in the instructions, it is an offset from
the register to the ldah instruction. This lets us avoid any
stupid hackery like inventing a gp value to do partial relocation
against. Also unlike ECOFF, we do the whole relocation off of
the GPDISP rather than a GPDISP_HI16/GPDISP_LO16 pair. An odd,
space consuming bit, that, since all the information was present
in the GPDISP_HI16 reloc. */
HOWTO (R_ALPHA_GPDISP, /* type */
16, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_gpdisp, /* special_function */
"GPDISP", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* A 21 bit branch. */
HOWTO (R_ALPHA_BRADDR, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
21, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"BRADDR", /* name */
false, /* partial_inplace */
0x1fffff, /* src_mask */
0x1fffff, /* dst_mask */
true), /* pcrel_offset */
/* A hint for a jump to a register. */
HOWTO (R_ALPHA_HINT, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
14, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
0, /* special_function */
"HINT", /* name */
false, /* partial_inplace */
0x3fff, /* src_mask */
0x3fff, /* dst_mask */
true), /* pcrel_offset */
/* 16 bit PC relative offset. */
HOWTO (R_ALPHA_SREL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"SREL16", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* 32 bit PC relative offset. */
HOWTO (R_ALPHA_SREL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"SREL32", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* A 64 bit PC relative offset. */
HOWTO (R_ALPHA_SREL64, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"SREL64", /* name */
false, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
true), /* pcrel_offset */
/* Push a value on the reloc evaluation stack. */
/* Not implemented -- it's dumb. */
HOWTO (R_ALPHA_OP_PUSH, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"OP_PUSH", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Store the value from the stack at the given address. Store it in
a bitfield of size r_size starting at bit position r_offset. */
/* Not implemented -- it's dumb. */
HOWTO (R_ALPHA_OP_STORE, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"OP_STORE", /* name */
false, /* partial_inplace */
0, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* Subtract the reloc address from the value on the top of the
relocation stack. */
/* Not implemented -- it's dumb. */
HOWTO (R_ALPHA_OP_PSUB, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"OP_PSUB", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Shift the value on the top of the relocation stack right by the
given value. */
/* Not implemented -- it's dumb. */
HOWTO (R_ALPHA_OP_PRSHIFT, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"OP_PRSHIFT", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Change the value of GP used by +r_addend until the next GPVALUE or the
end of the input bfd. */
/* Not implemented -- it's dumb. */
HOWTO (R_ALPHA_GPVALUE,
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"GPVALUE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* The high 16 bits of the displacement from GP to the target. */
HOWTO (R_ALPHA_GPRELHIGH,
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"GPRELHIGH", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The low 16 bits of the displacement from GP to the target. */
HOWTO (R_ALPHA_GPRELLOW,
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"GPRELLOW", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* A 16-bit displacement from the GP to the target. */
/* XXX: Not implemented. */
HOWTO (R_ALPHA_IMMED_GP_16,
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"IMMED_GP_16", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* The high bits of a 32-bit displacement from the GP to the target; the
low bits are supplied in the subsequent R_ALPHA_IMMED_LO32 relocs. */
/* XXX: Not implemented. */
HOWTO (R_ALPHA_IMMED_GP_HI32,
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"IMMED_GP_HI32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* The high bits of a 32-bit displacement to the starting address of the
current section (the relocation target is ignored); the low bits are
supplied in the subsequent R_ALPHA_IMMED_LO32 relocs. */
/* XXX: Not implemented. */
HOWTO (R_ALPHA_IMMED_SCN_HI32,
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"IMMED_SCN_HI32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* The high bits of a 32-bit displacement from the previous br, bsr, jsr
or jmp insn (as tagged by a BRADDR or HINT reloc) to the target; the
low bits are supplied by subsequent R_ALPHA_IMMED_LO32 relocs. */
/* XXX: Not implemented. */
HOWTO (R_ALPHA_IMMED_BR_HI32,
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"IMMED_BR_HI32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* The low 16 bits of a displacement calculated in a previous HI32 reloc. */
/* XXX: Not implemented. */
HOWTO (R_ALPHA_IMMED_LO32,
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
elf64_alpha_reloc_bad, /* special_function */
"IMMED_LO32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* Misc ELF relocations. */
/* A dynamic relocation to copy the target into our .dynbss section. */
/* Not generated, as all Alpha objects use PIC, so it is not needed. It
is present because every other ELF has one, but should not be used
because .dynbss is an ugly thing. */
HOWTO (R_ALPHA_COPY,
0,
0,
0,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"COPY",
false,
0,
0,
true),
/* A dynamic relocation for a .got entry. */
HOWTO (R_ALPHA_GLOB_DAT,
0,
0,
0,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"GLOB_DAT",
false,
0,
0,
true),
/* A dynamic relocation for a .plt entry. */
HOWTO (R_ALPHA_JMP_SLOT,
0,
0,
0,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"JMP_SLOT",
false,
0,
0,
true),
/* A dynamic relocation to add the base of the DSO to a 64-bit field. */
HOWTO (R_ALPHA_RELATIVE,
0,
0,
0,
false,
0,
complain_overflow_dont,
bfd_elf_generic_reloc,
"RELATIVE",
false,
0,
0,
true)
};
/* A relocation function which doesn't do anything. */
static bfd_reloc_status_type
elf64_alpha_reloc_nil (abfd, reloc, sym, data, sec, output_bfd, error_message)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *reloc;
asymbol *sym ATTRIBUTE_UNUSED;
PTR data ATTRIBUTE_UNUSED;
asection *sec;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
if (output_bfd)
reloc->address += sec->output_offset;
return bfd_reloc_ok;
}
/* A relocation function used for an unsupported reloc. */
static bfd_reloc_status_type
elf64_alpha_reloc_bad (abfd, reloc, sym, data, sec, output_bfd, error_message)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *reloc;
asymbol *sym ATTRIBUTE_UNUSED;
PTR data ATTRIBUTE_UNUSED;
asection *sec;
bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
{
if (output_bfd)
reloc->address += sec->output_offset;
return bfd_reloc_notsupported;
}
/* Do the work of the GPDISP relocation. */
static bfd_reloc_status_type
elf64_alpha_do_reloc_gpdisp (abfd, gpdisp, p_ldah, p_lda)
bfd *abfd;
bfd_vma gpdisp;
bfd_byte *p_ldah;
bfd_byte *p_lda;
{
bfd_reloc_status_type ret = bfd_reloc_ok;
bfd_vma addend;
unsigned long i_ldah, i_lda;
i_ldah = bfd_get_32 (abfd, p_ldah);
i_lda = bfd_get_32 (abfd, p_lda);
/* Complain if the instructions are not correct. */
if (((i_ldah >> 26) & 0x3f) != 0x09
|| ((i_lda >> 26) & 0x3f) != 0x08)
ret = bfd_reloc_dangerous;
/* Extract the user-supplied offset, mirroring the sign extensions
that the instructions perform. */
addend = ((i_ldah & 0xffff) << 16) | (i_lda & 0xffff);
addend = (addend ^ 0x80008000) - 0x80008000;
gpdisp += addend;
if ((bfd_signed_vma) gpdisp < -(bfd_signed_vma) 0x80000000
|| (bfd_signed_vma) gpdisp >= (bfd_signed_vma) 0x7fff8000)
ret = bfd_reloc_overflow;
/* compensate for the sign extension again. */
i_ldah = ((i_ldah & 0xffff0000)
| (((gpdisp >> 16) + ((gpdisp >> 15) & 1)) & 0xffff));
i_lda = (i_lda & 0xffff0000) | (gpdisp & 0xffff);
bfd_put_32 (abfd, i_ldah, p_ldah);
bfd_put_32 (abfd, i_lda, p_lda);
return ret;
}
/* The special function for the GPDISP reloc. */
static bfd_reloc_status_type
elf64_alpha_reloc_gpdisp (abfd, reloc_entry, sym, data, input_section,
output_bfd, err_msg)
bfd *abfd;
arelent *reloc_entry;
asymbol *sym ATTRIBUTE_UNUSED;
PTR data;
asection *input_section;
bfd *output_bfd;
char **err_msg;
{
bfd_reloc_status_type ret;
bfd_vma gp, relocation;
bfd_byte *p_ldah, *p_lda;
/* Don't do anything if we're not doing a final link. */
if (output_bfd)
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (reloc_entry->address > input_section->_cooked_size ||
reloc_entry->address + reloc_entry->addend > input_section->_cooked_size)
return bfd_reloc_outofrange;
/* The gp used in the portion of the output object to which this
input object belongs is cached on the input bfd. */
gp = _bfd_get_gp_value (abfd);
relocation = (input_section->output_section->vma
+ input_section->output_offset
+ reloc_entry->address);
p_ldah = (bfd_byte *) data + reloc_entry->address;
p_lda = p_ldah + reloc_entry->addend;
ret = elf64_alpha_do_reloc_gpdisp (abfd, gp - relocation, p_ldah, p_lda);
/* Complain if the instructions are not correct. */
if (ret == bfd_reloc_dangerous)
*err_msg = _("GPDISP relocation did not find ldah and lda instructions");
return ret;
}
/* A mapping from BFD reloc types to Alpha ELF reloc types. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
int elf_reloc_val;
};
static const struct elf_reloc_map elf64_alpha_reloc_map[] =
{
{BFD_RELOC_NONE, R_ALPHA_NONE},
{BFD_RELOC_32, R_ALPHA_REFLONG},
{BFD_RELOC_64, R_ALPHA_REFQUAD},
{BFD_RELOC_CTOR, R_ALPHA_REFQUAD},
{BFD_RELOC_GPREL32, R_ALPHA_GPREL32},
{BFD_RELOC_ALPHA_ELF_LITERAL, R_ALPHA_LITERAL},
{BFD_RELOC_ALPHA_LITUSE, R_ALPHA_LITUSE},
{BFD_RELOC_ALPHA_GPDISP, R_ALPHA_GPDISP},
{BFD_RELOC_23_PCREL_S2, R_ALPHA_BRADDR},
{BFD_RELOC_ALPHA_HINT, R_ALPHA_HINT},
{BFD_RELOC_16_PCREL, R_ALPHA_SREL16},
{BFD_RELOC_32_PCREL, R_ALPHA_SREL32},
{BFD_RELOC_64_PCREL, R_ALPHA_SREL64},
/* The BFD_RELOC_ALPHA_USER_* relocations are used by the assembler to process
the explicit !<reloc>!sequence relocations, and are mapped into the normal
relocations at the end of processing. */
{BFD_RELOC_ALPHA_USER_LITERAL, R_ALPHA_LITERAL},
{BFD_RELOC_ALPHA_USER_LITUSE_BASE, R_ALPHA_LITUSE},
{BFD_RELOC_ALPHA_USER_LITUSE_BYTOFF, R_ALPHA_LITUSE},
{BFD_RELOC_ALPHA_USER_LITUSE_JSR, R_ALPHA_LITUSE},
{BFD_RELOC_ALPHA_USER_GPDISP, R_ALPHA_GPDISP},
{BFD_RELOC_ALPHA_USER_GPRELHIGH, R_ALPHA_GPRELHIGH},
{BFD_RELOC_ALPHA_USER_GPRELLOW, R_ALPHA_GPRELLOW},
};
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
elf64_alpha_bfd_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
const struct elf_reloc_map *i, *e;
i = e = elf64_alpha_reloc_map;
e += sizeof (elf64_alpha_reloc_map) / sizeof (struct elf_reloc_map);
for (; i != e; ++i)
{
if (i->bfd_reloc_val == code)
return &elf64_alpha_howto_table[i->elf_reloc_val];
}
return 0;
}
/* Given an Alpha ELF reloc type, fill in an arelent structure. */
static void
elf64_alpha_info_to_howto (abfd, cache_ptr, dst)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *cache_ptr;
Elf64_Internal_Rela *dst;
{
unsigned r_type;
r_type = ELF64_R_TYPE(dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_ALPHA_max);
cache_ptr->howto = &elf64_alpha_howto_table[r_type];
}
/* These functions do relaxation for Alpha ELF.
Currently I'm only handling what I can do with existing compiler
and assembler support, which means no instructions are removed,
though some may be nopped. At this time GCC does not emit enough
information to do all of the relaxing that is possible. It will
take some not small amount of work for that to happen.
There are a couple of interesting papers that I once read on this
subject, that I cannot find references to at the moment, that
related to Alpha in particular. They are by David Wall, then of
DEC WRL. */
#define OP_LDA 0x08
#define OP_LDAH 0x09
#define INSN_JSR 0x68004000
#define INSN_JSR_MASK 0xfc00c000
#define OP_LDQ 0x29
#define OP_BR 0x30
#define OP_BSR 0x34
#define INSN_UNOP 0x2fe00000
struct alpha_relax_info
{
bfd *abfd;
asection *sec;
bfd_byte *contents;
Elf_Internal_Rela *relocs, *relend;
struct bfd_link_info *link_info;
boolean changed_contents;
boolean changed_relocs;
bfd_vma gp;
bfd *gotobj;
asection *tsec;
struct alpha_elf_link_hash_entry *h;
struct alpha_elf_got_entry *gotent;
unsigned char other;
};
static Elf_Internal_Rela * elf64_alpha_relax_with_lituse
PARAMS((struct alpha_relax_info *info, bfd_vma symval,
Elf_Internal_Rela *irel, Elf_Internal_Rela *irelend));
static boolean elf64_alpha_relax_without_lituse
PARAMS((struct alpha_relax_info *info, bfd_vma symval,
Elf_Internal_Rela *irel));
static bfd_vma elf64_alpha_relax_opt_call
PARAMS((struct alpha_relax_info *info, bfd_vma symval));
static boolean elf64_alpha_relax_section
PARAMS((bfd *abfd, asection *sec, struct bfd_link_info *link_info,
boolean *again));
static Elf_Internal_Rela *
elf64_alpha_find_reloc_at_ofs (rel, relend, offset, type)
Elf_Internal_Rela *rel, *relend;
bfd_vma offset;
int type;
{
while (rel < relend)
{
if (rel->r_offset == offset && ELF64_R_TYPE (rel->r_info) == type)
return rel;
++rel;
}
return NULL;
}
static Elf_Internal_Rela *
elf64_alpha_relax_with_lituse (info, symval, irel, irelend)
struct alpha_relax_info *info;
bfd_vma symval;
Elf_Internal_Rela *irel, *irelend;
{
Elf_Internal_Rela *urel;
int flags, count, i;
bfd_signed_vma disp;
boolean fits16;
boolean fits32;
boolean lit_reused = false;
boolean all_optimized = true;
unsigned int lit_insn;
lit_insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset);
if (lit_insn >> 26 != OP_LDQ)
{
((*_bfd_error_handler)
("%s: %s+0x%lx: warning: LITERAL relocation against unexpected insn",
bfd_get_filename (info->abfd), info->sec->name,
(unsigned long)irel->r_offset));
return irel;
}
/* Summarize how this particular LITERAL is used. */
for (urel = irel+1, flags = count = 0; urel < irelend; ++urel, ++count)
{
if (ELF64_R_TYPE (urel->r_info) != R_ALPHA_LITUSE)
break;
if (urel->r_addend >= 0 && urel->r_addend <= 3)
flags |= 1 << urel->r_addend;
}
/* A little preparation for the loop... */
disp = symval - info->gp;
for (urel = irel+1, i = 0; i < count; ++i, ++urel)
{
unsigned int insn;
int insn_disp;
bfd_signed_vma xdisp;
insn = bfd_get_32 (info->abfd, info->contents + urel->r_offset);
switch (urel->r_addend)
{
default: /* 0 = ADDRESS FORMAT */
/* This type is really just a placeholder to note that all
uses cannot be optimized, but to still allow some. */
all_optimized = false;
break;
case 1: /* MEM FORMAT */
/* We can always optimize 16-bit displacements. */
/* Extract the displacement from the instruction, sign-extending
it if necessary, then test whether it is within 16 or 32 bits
displacement from GP. */
insn_disp = insn & 0x0000ffff;
if (insn_disp & 0x00008000)
insn_disp |= 0xffff0000; /* Negative: sign-extend. */
xdisp = disp + insn_disp;
fits16 = (xdisp >= - (bfd_signed_vma) 0x00008000 && xdisp < 0x00008000);
fits32 = (xdisp >= - (bfd_signed_vma) 0x80000000 && xdisp < 0x7fff8000);
if (fits16)
{
/* Take the op code and dest from this insn, take the base
register from the literal insn. Leave the offset alone. */
insn = (insn & 0xffe0ffff) | (lit_insn & 0x001f0000);
urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
R_ALPHA_GPRELLOW);
urel->r_addend = irel->r_addend;
info->changed_relocs = true;
bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset);
info->changed_contents = true;
}
/* If all mem+byte, we can optimize 32-bit mem displacements. */
else if (fits32 && !(flags & ~6))
{
/* FIXME: sanity check that lit insn Ra is mem insn Rb. */
irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
R_ALPHA_GPRELHIGH);
lit_insn = (OP_LDAH << 26) | (lit_insn & 0x03ff0000);
bfd_put_32 (info->abfd, lit_insn,
info->contents + irel->r_offset);
lit_reused = true;
info->changed_contents = true;
urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
R_ALPHA_GPRELLOW);
urel->r_addend = irel->r_addend;
info->changed_relocs = true;
}
else
all_optimized = false;
break;
case 2: /* BYTE OFFSET FORMAT */
/* We can always optimize byte instructions. */
/* FIXME: sanity check the insn for byte op. Check that the
literal dest reg is indeed Rb in the byte insn. */
insn = (insn & ~0x001ff000) | ((symval & 7) << 13) | 0x1000;
urel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
urel->r_addend = 0;
info->changed_relocs = true;
bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset);
info->changed_contents = true;
break;
case 3: /* CALL FORMAT */
{
/* If not zero, place to jump without needing pv. */
bfd_vma optdest = elf64_alpha_relax_opt_call (info, symval);
bfd_vma org = (info->sec->output_section->vma
+ info->sec->output_offset
+ urel->r_offset + 4);
bfd_signed_vma odisp;
odisp = (optdest ? optdest : symval) - org;
if (odisp >= -0x400000 && odisp < 0x400000)
{
Elf_Internal_Rela *xrel;
/* Preserve branch prediction call stack when possible. */
if ((insn & INSN_JSR_MASK) == INSN_JSR)
insn = (OP_BSR << 26) | (insn & 0x03e00000);
else
insn = (OP_BR << 26) | (insn & 0x03e00000);
urel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info),
R_ALPHA_BRADDR);
urel->r_addend = irel->r_addend;
if (optdest)
urel->r_addend += optdest - symval;
else
all_optimized = false;
bfd_put_32 (info->abfd, insn, info->contents + urel->r_offset);
/* Kill any HINT reloc that might exist for this insn. */
xrel = (elf64_alpha_find_reloc_at_ofs
(info->relocs, info->relend, urel->r_offset,
R_ALPHA_HINT));
if (xrel)
xrel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
info->changed_contents = true;
info->changed_relocs = true;
}
else
all_optimized = false;
/* ??? If target gp == current gp we can eliminate the gp reload.
This does depend on every place a gp could be reloaded will
be, which currently happens for all code produced by gcc, but
not necessarily by hand-coded assembly, or if sibling calls
are enabled in gcc.
Perhaps conditionalize this on a flag being set in the target
object file's header, and have gcc set it? */
}
break;
}
}
/* If all cases were optimized, we can reduce the use count on this
got entry by one, possibly eliminating it. */
if (all_optimized)
{
info->gotent->use_count -= 1;
alpha_elf_tdata (info->gotent->gotobj)->total_got_entries -= 1;
if (!info->h)
alpha_elf_tdata (info->gotent->gotobj)->n_local_got_entries -= 1;
/* If the literal instruction is no longer needed (it may have been
reused. We can eliminate it.
??? For now, I don't want to deal with compacting the section,
so just nop it out. */
if (!lit_reused)
{
irel->r_info = ELF64_R_INFO (0, R_ALPHA_NONE);
info->changed_relocs = true;
bfd_put_32 (info->abfd, INSN_UNOP, info->contents + irel->r_offset);
info->changed_contents = true;
}
}
return irel + count;
}
static bfd_vma
elf64_alpha_relax_opt_call (info, symval)
struct alpha_relax_info *info;
bfd_vma symval;
{
/* If the function has the same gp, and we can identify that the
function does not use its function pointer, we can eliminate the
address load. */
/* If the symbol is marked NOPV, we are being told the function never
needs its procedure value. */
if ((info->other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV)
return symval;
/* If the symbol is marked STD_GP, we are being told the function does
a normal ldgp in the first two words. */
else if ((info->other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD)
;
/* Otherwise, we may be able to identify a GP load in the first two
words, which we can then skip. */
else
{
Elf_Internal_Rela *tsec_relocs, *tsec_relend, *tsec_free, *gpdisp;
bfd_vma ofs;
/* Load the relocations from the section that the target symbol is in. */
if (info->sec == info->tsec)
{
tsec_relocs = info->relocs;
tsec_relend = info->relend;
tsec_free = NULL;
}
else
{
tsec_relocs = (_bfd_elf64_link_read_relocs
(info->abfd, info->tsec, (PTR) NULL,
(Elf_Internal_Rela *) NULL,
info->link_info->keep_memory));
if (tsec_relocs == NULL)
return 0;
tsec_relend = tsec_relocs + info->tsec->reloc_count;
tsec_free = (info->link_info->keep_memory ? NULL : tsec_relocs);
}
/* Recover the symbol's offset within the section. */
ofs = (symval - info->tsec->output_section->vma
- info->tsec->output_offset);
/* Look for a GPDISP reloc. */
gpdisp = (elf64_alpha_find_reloc_at_ofs
(tsec_relocs, tsec_relend, ofs, R_ALPHA_GPDISP));
if (!gpdisp || gpdisp->r_addend != 4)
{
if (tsec_free)
free (tsec_free);
return 0;
}
if (tsec_free)
free (tsec_free);
}
/* We've now determined that we can skip an initial gp load. Verify
that the call and the target use the same gp. */
if (info->link_info->hash->creator != info->tsec->owner->xvec
|| info->gotobj != alpha_elf_tdata (info->tsec->owner)->gotobj)
return 0;
return symval + 8;
}
static boolean
elf64_alpha_relax_without_lituse (info, symval, irel)
struct alpha_relax_info *info;
bfd_vma symval;
Elf_Internal_Rela *irel;
{
unsigned int insn;
bfd_signed_vma disp;
/* Get the instruction. */
insn = bfd_get_32 (info->abfd, info->contents + irel->r_offset);
if (insn >> 26 != OP_LDQ)
{
((*_bfd_error_handler)
("%s: %s+0x%lx: warning: LITERAL relocation against unexpected insn",
bfd_get_filename (info->abfd), info->sec->name,
(unsigned long) irel->r_offset));
return true;
}
/* So we aren't told much. Do what we can with the address load and
fake the rest. All of the optimizations here require that the
offset from the GP fit in 16 bits. */
disp = symval - info->gp;
if (disp < -0x8000 || disp >= 0x8000)
return true;
/* On the LITERAL instruction itself, consider exchanging
`ldq R,X(gp)' for `lda R,Y(gp)'. */
insn = (OP_LDA << 26) | (insn & 0x03ff0000);
bfd_put_32 (info->abfd, insn, info->contents + irel->r_offset);
info->changed_contents = true;
irel->r_info = ELF64_R_INFO (ELF64_R_SYM (irel->r_info), R_ALPHA_GPRELLOW);
info->changed_relocs = true;
/* Reduce the use count on this got entry by one, possibly
eliminating it. */
info->gotent->use_count -= 1;
alpha_elf_tdata (info->gotent->gotobj)->total_got_entries -= 1;
if (!info->h)
alpha_elf_tdata (info->gotent->gotobj)->n_local_got_entries -= 1;
/* ??? Search forward through this basic block looking for insns
that use the target register. Stop after an insn modifying the
register is seen, or after a branch or call.
Any such memory load insn may be substituted by a load directly
off the GP. This allows the memory load insn to be issued before
the calculated GP register would otherwise be ready.
Any such jsr insn can be replaced by a bsr if it is in range.
This would mean that we'd have to _add_ relocations, the pain of
which gives one pause. */
return true;
}
static boolean
elf64_alpha_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;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *free_contents = NULL;
Elf64_External_Sym *extsyms = NULL;
Elf64_External_Sym *free_extsyms = NULL;
struct alpha_elf_got_entry **local_got_entries;
struct alpha_relax_info info;
/* We are not currently changing any sizes, so only one pass. */
*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;
local_got_entries = alpha_elf_tdata(abfd)->local_got_entries;
/* Load the relocations for this section. */
internal_relocs = (_bfd_elf64_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;
memset(&info, 0, sizeof (info));
info.abfd = abfd;
info.sec = sec;
info.link_info = link_info;
info.relocs = internal_relocs;
info.relend = irelend = internal_relocs + sec->reloc_count;
/* Find the GP for this object. */
info.gotobj = alpha_elf_tdata (abfd)->gotobj;
if (info.gotobj)
{
asection *sgot = alpha_elf_tdata (info.gotobj)->got;
info.gp = _bfd_get_gp_value (info.gotobj);
if (info.gp == 0)
{
info.gp = (sgot->output_section->vma
+ sgot->output_offset
+ 0x8000);
_bfd_set_gp_value (info.gotobj, info.gp);
}
}
for (irel = internal_relocs; irel < irelend; irel++)
{
bfd_vma symval;
Elf_Internal_Sym isym;
struct alpha_elf_got_entry *gotent;
if (ELF64_R_TYPE (irel->r_info) != (int) R_ALPHA_LITERAL)
continue;
/* Get the section contents. */
if (info.contents == NULL)
{
if (elf_section_data (sec)->this_hdr.contents != NULL)
info.contents = elf_section_data (sec)->this_hdr.contents;
else
{
info.contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
if (info.contents == NULL)
goto error_return;
free_contents = info.contents;
if (! bfd_get_section_contents (abfd, sec, info.contents,
(file_ptr) 0, sec->_raw_size))
goto error_return;
}
}
/* Read this BFD's symbols if we haven't done so already. */
if (extsyms == NULL)
{
if (symtab_hdr->contents != NULL)
extsyms = (Elf64_External_Sym *) symtab_hdr->contents;
else
{
extsyms = ((Elf64_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 (ELF64_R_SYM (irel->r_info) < symtab_hdr->sh_info)
{
/* A local symbol. */
bfd_elf64_swap_symbol_in (abfd,
extsyms + ELF64_R_SYM (irel->r_info),
&isym);
if (isym.st_shndx == SHN_UNDEF)
info.tsec = bfd_und_section_ptr;
else if (isym.st_shndx > 0 && isym.st_shndx < SHN_LORESERVE)
info.tsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
else if (isym.st_shndx == SHN_ABS)
info.tsec = bfd_abs_section_ptr;
else if (isym.st_shndx == SHN_COMMON)
info.tsec = bfd_com_section_ptr;
else
continue; /* who knows. */
info.h = NULL;
info.other = isym.st_other;
gotent = local_got_entries[ELF64_R_SYM(irel->r_info)];
symval = isym.st_value;
}
else
{
unsigned long indx;
struct alpha_elf_link_hash_entry *h;
indx = ELF64_R_SYM (irel->r_info) - symtab_hdr->sh_info;
h = alpha_elf_sym_hashes (abfd)[indx];
BFD_ASSERT (h != NULL);
while (h->root.root.type == bfd_link_hash_indirect
|| h->root.root.type == bfd_link_hash_warning)
h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
/* We can't do anthing with undefined or dynamic symbols. */
if (h->root.root.type == bfd_link_hash_undefined
|| h->root.root.type == bfd_link_hash_undefweak
|| alpha_elf_dynamic_symbol_p (&h->root, link_info))
continue;
info.h = h;
info.gotent = gotent;
info.tsec = h->root.root.u.def.section;
info.other = h->root.other;
gotent = h->got_entries;
symval = h->root.root.u.def.value;
}
/* Search for the got entry to be used by this relocation. */
while (gotent->gotobj != info.gotobj || gotent->addend != irel->r_addend)
gotent = gotent->next;
info.gotent = gotent;
symval += info.tsec->output_section->vma + info.tsec->output_offset;
symval += irel->r_addend;
BFD_ASSERT(info.gotent != NULL);
/* If there exist LITUSE relocations immediately following, this
opens up all sorts of interesting optimizations, because we
now know every location that this address load is used. */
if (irel+1 < irelend && ELF64_R_TYPE (irel[1].r_info) == R_ALPHA_LITUSE)
{
irel = elf64_alpha_relax_with_lituse (&info, symval, irel, irelend);
if (irel == NULL)
goto error_return;
}
else
{
if (!elf64_alpha_relax_without_lituse (&info, symval, irel))
goto error_return;
}
}
if (!elf64_alpha_size_got_sections (abfd, link_info))
return false;
if (info.changed_relocs)
{
elf_section_data (sec)->relocs = internal_relocs;
}
else if (free_relocs != NULL)
{
free (free_relocs);
}
if (info.changed_contents)
{
elf_section_data (sec)->this_hdr.contents = info.contents;
}
else 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 = info.contents;
}
}
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;
}
}
*again = info.changed_contents || info.changed_relocs;
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;
}
/* PLT/GOT Stuff */
#define PLT_HEADER_SIZE 32
#define PLT_HEADER_WORD1 0xc3600000 /* br $27,.+4 */
#define PLT_HEADER_WORD2 0xa77b000c /* ldq $27,12($27) */
#define PLT_HEADER_WORD3 0x47ff041f /* nop */
#define PLT_HEADER_WORD4 0x6b7b0000 /* jmp $27,($27) */
#define PLT_ENTRY_SIZE 12
#define PLT_ENTRY_WORD1 0xc3800000 /* br $28, plt0 */
#define PLT_ENTRY_WORD2 0
#define PLT_ENTRY_WORD3 0
#define MAX_GOT_ENTRIES (64*1024 / 8)
#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so"
/* Handle an Alpha specific section when reading an object file. This
is called when elfcode.h finds a section with an unknown type.
FIXME: We need to handle the SHF_ALPHA_GPREL flag, but I'm not sure
how to. */
static boolean
elf64_alpha_section_from_shdr (abfd, hdr, name)
bfd *abfd;
Elf64_Internal_Shdr *hdr;
char *name;
{
asection *newsect;
/* There ought to be a place to keep ELF backend specific flags, but
at the moment there isn't one. We just keep track of the
sections by their name, instead. Fortunately, the ABI gives
suggested names for all the MIPS specific sections, so we will
probably get away with this. */
switch (hdr->sh_type)
{
case SHT_ALPHA_DEBUG:
if (strcmp (name, ".mdebug") != 0)
return false;
break;
#ifdef ERIC_neverdef
case SHT_ALPHA_REGINFO:
if (strcmp (name, ".reginfo") != 0
|| hdr->sh_size != sizeof (Elf64_External_RegInfo))
return false;
break;
#endif
default:
return false;
}
if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
return false;
newsect = hdr->bfd_section;
if (hdr->sh_type == SHT_ALPHA_DEBUG)
{
if (! bfd_set_section_flags (abfd, newsect,
(bfd_get_section_flags (abfd, newsect)
| SEC_DEBUGGING)))
return false;
}
#ifdef ERIC_neverdef
/* For a .reginfo section, set the gp value in the tdata information
from the contents of this section. We need the gp value while
processing relocs, so we just get it now. */
if (hdr->sh_type == SHT_ALPHA_REGINFO)
{
Elf64_External_RegInfo ext;
Elf64_RegInfo s;
if (! bfd_get_section_contents (abfd, newsect, (PTR) &ext,
(file_ptr) 0, sizeof ext))
return false;
bfd_alpha_elf64_swap_reginfo_in (abfd, &ext, &s);
elf_gp (abfd) = s.ri_gp_value;
}
#endif
return true;
}
/* Set the correct type for an Alpha ELF section. We do this by the
section name, which is a hack, but ought to work. */
static boolean
elf64_alpha_fake_sections (abfd, hdr, sec)
bfd *abfd;
Elf64_Internal_Shdr *hdr;
asection *sec;
{
register const char *name;
name = bfd_get_section_name (abfd, sec);
if (strcmp (name, ".mdebug") == 0)
{
hdr->sh_type = SHT_ALPHA_DEBUG;
/* In a shared object on Irix 5.3, the .mdebug section has an
entsize of 0. FIXME: Does this matter? */
if ((abfd->flags & DYNAMIC) != 0 )
hdr->sh_entsize = 0;
else
hdr->sh_entsize = 1;
}
#ifdef ERIC_neverdef
else if (strcmp (name, ".reginfo") == 0)
{
hdr->sh_type = SHT_ALPHA_REGINFO;
/* In a shared object on Irix 5.3, the .reginfo section has an
entsize of 0x18. FIXME: Does this matter? */
if ((abfd->flags & DYNAMIC) != 0)
hdr->sh_entsize = sizeof (Elf64_External_RegInfo);
else
hdr->sh_entsize = 1;
/* Force the section size to the correct value, even if the
linker thinks it is larger. The link routine below will only
write out this much data for .reginfo. */
hdr->sh_size = sec->_raw_size = sizeof (Elf64_External_RegInfo);
}
else if (strcmp (name, ".hash") == 0
|| strcmp (name, ".dynamic") == 0
|| strcmp (name, ".dynstr") == 0)
{
hdr->sh_entsize = 0;
hdr->sh_info = SIZEOF_ALPHA_DYNSYM_SECNAMES;
}
#endif
else if (strcmp (name, ".sdata") == 0
|| strcmp (name, ".sbss") == 0
|| strcmp (name, ".lit4") == 0
|| strcmp (name, ".lit8") == 0)
hdr->sh_flags |= SHF_ALPHA_GPREL;
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
elf64_alpha_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_get_gp_size (abfd))
{
/* Common symbols less than or equal to -G nn bytes are
automatically put into .sbss. */
asection *scomm = bfd_get_section_by_name (abfd, ".scommon");
if (scomm == NULL)
{
scomm = bfd_make_section (abfd, ".scommon");
if (scomm == NULL
|| !bfd_set_section_flags (abfd, scomm, (SEC_ALLOC
| SEC_IS_COMMON
| SEC_LINKER_CREATED)))
return false;
}
*secp = scomm;
*valp = sym->st_size;
}
return true;
}
/* Create the .got section. */
static boolean
elf64_alpha_create_got_section(abfd, info)
bfd *abfd;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
{
asection *s;
if (bfd_get_section_by_name (abfd, ".got"))
return true;
s = bfd_make_section (abfd, ".got");
if (s == NULL
|| !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED))
|| !bfd_set_section_alignment (abfd, s, 3))
return false;
alpha_elf_tdata (abfd)->got = s;
return true;
}
/* Create all the dynamic sections. */
static boolean
elf64_alpha_create_dynamic_sections (abfd, info)
bfd *abfd;
struct bfd_link_info *info;
{
asection *s;
struct elf_link_hash_entry *h;
/* We need to create .plt, .rela.plt, .got, and .rela.got sections. */
s = bfd_make_section (abfd, ".plt");
if (s == NULL
|| ! bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_CODE))
|| ! bfd_set_section_alignment (abfd, s, 3))
return false;
/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
.plt section. */
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, ".rela.plt");
if (s == NULL
|| !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| ! bfd_set_section_alignment (abfd, s, 3))
return false;
/* We may or may not have created a .got section for this object, but
we definitely havn't done the rest of the work. */
if (!elf64_alpha_create_got_section (abfd, info))
return false;
s = bfd_make_section(abfd, ".rela.got");
if (s == NULL
|| !bfd_set_section_flags (abfd, s, (SEC_ALLOC | SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| !bfd_set_section_alignment (abfd, s, 3))
return false;
/* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the
dynobj's .got section. We don't do this in the linker script
because we don't want to define the symbol if we are not creating
a global offset table. */
h = NULL;
if (!(_bfd_generic_link_add_one_symbol
(info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL,
alpha_elf_tdata(abfd)->got, (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;
elf_hash_table (info)->hgot = h;
return true;
}
/* Read ECOFF debugging information from a .mdebug section into a
ecoff_debug_info structure. */
static boolean
elf64_alpha_read_ecoff_info (abfd, section, debug)
bfd *abfd;
asection *section;
struct ecoff_debug_info *debug;
{
HDRR *symhdr;
const struct ecoff_debug_swap *swap;
char *ext_hdr = NULL;
swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
memset (debug, 0, sizeof (*debug));
ext_hdr = (char *) bfd_malloc ((size_t) swap->external_hdr_size);
if (ext_hdr == NULL && swap->external_hdr_size != 0)
goto error_return;
if (bfd_get_section_contents (abfd, section, ext_hdr, (file_ptr) 0,
swap->external_hdr_size)
== false)
goto error_return;
symhdr = &debug->symbolic_header;
(*swap->swap_hdr_in) (abfd, ext_hdr, symhdr);
/* The symbolic header contains absolute file offsets and sizes to
read. */
#define READ(ptr, offset, count, size, type) \
if (symhdr->count == 0) \
debug->ptr = NULL; \
else \
{ \
debug->ptr = (type) bfd_malloc ((size_t) (size * symhdr->count)); \
if (debug->ptr == NULL) \
goto error_return; \
if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
|| (bfd_read (debug->ptr, size, symhdr->count, \
abfd) != size * symhdr->count)) \
goto error_return; \
}
READ (line, cbLineOffset, cbLine, sizeof (unsigned char), unsigned char *);
READ (external_dnr, cbDnOffset, idnMax, swap->external_dnr_size, PTR);
READ (external_pdr, cbPdOffset, ipdMax, swap->external_pdr_size, PTR);
READ (external_sym, cbSymOffset, isymMax, swap->external_sym_size, PTR);
READ (external_opt, cbOptOffset, ioptMax, swap->external_opt_size, PTR);
READ (external_aux, cbAuxOffset, iauxMax, sizeof (union aux_ext),
union aux_ext *);
READ (ss, cbSsOffset, issMax, sizeof (char), char *);
READ (ssext, cbSsExtOffset, issExtMax, sizeof (char), char *);
READ (external_fdr, cbFdOffset, ifdMax, swap->external_fdr_size, PTR);
READ (external_rfd, cbRfdOffset, crfd, swap->external_rfd_size, PTR);
READ (external_ext, cbExtOffset, iextMax, swap->external_ext_size, PTR);
#undef READ
debug->fdr = NULL;
debug->adjust = NULL;
return true;
error_return:
if (ext_hdr != NULL)
free (ext_hdr);
if (debug->line != NULL)
free (debug->line);
if (debug->external_dnr != NULL)
free (debug->external_dnr);
if (debug->external_pdr != NULL)
free (debug->external_pdr);
if (debug->external_sym != NULL)
free (debug->external_sym);
if (debug->external_opt != NULL)
free (debug->external_opt);
if (debug->external_aux != NULL)
free (debug->external_aux);
if (debug->ss != NULL)
free (debug->ss);
if (debug->ssext != NULL)
free (debug->ssext);
if (debug->external_fdr != NULL)
free (debug->external_fdr);
if (debug->external_rfd != NULL)
free (debug->external_rfd);
if (debug->external_ext != NULL)
free (debug->external_ext);
return false;
}
/* Alpha ELF local labels start with '$'. */
static boolean
elf64_alpha_is_local_label_name (abfd, name)
bfd *abfd ATTRIBUTE_UNUSED;
const char *name;
{
return name[0] == '$';
}
/* Alpha ELF follows MIPS ELF in using a special find_nearest_line
routine in order to handle the ECOFF debugging information. We
still call this mips_elf_find_line because of the slot
find_line_info in elf_obj_tdata is declared that way. */
struct mips_elf_find_line
{
struct ecoff_debug_info d;
struct ecoff_find_line i;
};
static boolean
elf64_alpha_find_nearest_line (abfd, section, symbols, offset, filename_ptr,
functionname_ptr, line_ptr)
bfd *abfd;
asection *section;
asymbol **symbols;
bfd_vma offset;
const char **filename_ptr;
const char **functionname_ptr;
unsigned int *line_ptr;
{
asection *msec;
if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
filename_ptr, functionname_ptr,
line_ptr, 0,
&elf_tdata (abfd)->dwarf2_find_line_info))
return true;
msec = bfd_get_section_by_name (abfd, ".mdebug");
if (msec != NULL)
{
flagword origflags;
struct mips_elf_find_line *fi;
const struct ecoff_debug_swap * const swap =
get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
/* If we are called during a link, alpha_elf_final_link may have
cleared the SEC_HAS_CONTENTS field. We force it back on here
if appropriate (which it normally will be). */
origflags = msec->flags;
if (elf_section_data (msec)->this_hdr.sh_type != SHT_NOBITS)
msec->flags |= SEC_HAS_CONTENTS;
fi = elf_tdata (abfd)->find_line_info;
if (fi == NULL)
{
bfd_size_type external_fdr_size;
char *fraw_src;
char *fraw_end;
struct fdr *fdr_ptr;
fi = ((struct mips_elf_find_line *)
bfd_zalloc (abfd, sizeof (struct mips_elf_find_line)));
if (fi == NULL)
{
msec->flags = origflags;
return false;
}
if (!elf64_alpha_read_ecoff_info (abfd, msec, &fi->d))
{
msec->flags = origflags;
return false;
}
/* Swap in the FDR information. */
fi->d.fdr = ((struct fdr *)
bfd_alloc (abfd,
(fi->d.symbolic_header.ifdMax *
sizeof (struct fdr))));
if (fi->d.fdr == NULL)
{
msec->flags = origflags;
return false;
}
external_fdr_size = swap->external_fdr_size;
fdr_ptr = fi->d.fdr;
fraw_src = (char *) fi->d.external_fdr;
fraw_end = (fraw_src
+ fi->d.symbolic_header.ifdMax * external_fdr_size);
for (; fraw_src < fraw_end; fraw_src += external_fdr_size, fdr_ptr++)
(*swap->swap_fdr_in) (abfd, (PTR) fraw_src, fdr_ptr);
elf_tdata (abfd)->find_line_info = fi;
/* Note that we don't bother to ever free this information.
find_nearest_line is either called all the time, as in
objdump -l, so the information should be saved, or it is
rarely called, as in ld error messages, so the memory
wasted is unimportant. Still, it would probably be a
good idea for free_cached_info to throw it away. */
}
if (_bfd_ecoff_locate_line (abfd, section, offset, &fi->d, swap,
&fi->i, filename_ptr, functionname_ptr,
line_ptr))
{
msec->flags = origflags;
return true;
}
msec->flags = origflags;
}
/* Fall back on the generic ELF find_nearest_line routine. */
return _bfd_elf_find_nearest_line (abfd, section, symbols, offset,
filename_ptr, functionname_ptr,
line_ptr);
}
/* Structure used to pass information to alpha_elf_output_extsym. */
struct extsym_info
{
bfd *abfd;
struct bfd_link_info *info;
struct ecoff_debug_info *debug;
const struct ecoff_debug_swap *swap;
boolean failed;
};
static boolean
elf64_alpha_output_extsym (h, data)
struct alpha_elf_link_hash_entry *h;
PTR data;
{
struct extsym_info *einfo = (struct extsym_info *) data;
boolean strip;
asection *sec, *output_section;
if (h->root.indx == -2)
strip = false;
else if (((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
|| (h->root.elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
&& (h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
&& (h->root.elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
strip = true;
else if (einfo->info->strip == strip_all
|| (einfo->info->strip == strip_some
&& bfd_hash_lookup (einfo->info->keep_hash,
h->root.root.root.string,
false, false) == NULL))
strip = true;
else
strip = false;
if (strip)
return true;
if (h->esym.ifd == -2)
{
h->esym.jmptbl = 0;
h->esym.cobol_main = 0;
h->esym.weakext = 0;
h->esym.reserved = 0;
h->esym.ifd = ifdNil;
h->esym.asym.value = 0;
h->esym.asym.st = stGlobal;
if (h->root.root.type != bfd_link_hash_defined
&& h->root.root.type != bfd_link_hash_defweak)
h->esym.asym.sc = scAbs;
else
{
const char *name;
sec = h->root.root.u.def.section;
output_section = sec->output_section;
/* When making a shared library and symbol h is the one from
the another shared library, OUTPUT_SECTION may be null. */
if (output_section == NULL)
h->esym.asym.sc = scUndefined;
else
{
name = bfd_section_name (output_section->owner, output_section);
if (strcmp (name, ".text") == 0)
h->esym.asym.sc = scText;
else if (strcmp (name, ".data") == 0)
h->esym.asym.sc = scData;
else if (strcmp (name, ".sdata") == 0)
h->esym.asym.sc = scSData;
else if (strcmp (name, ".rodata") == 0
|| strcmp (name, ".rdata") == 0)
h->esym.asym.sc = scRData;
else if (strcmp (name, ".bss") == 0)
h->esym.asym.sc = scBss;
else if (strcmp (name, ".sbss") == 0)
h->esym.asym.sc = scSBss;
else if (strcmp (name, ".init") == 0)
h->esym.asym.sc = scInit;
else if (strcmp (name, ".fini") == 0)
h->esym.asym.sc = scFini;
else
h->esym.asym.sc = scAbs;
}
}
h->esym.asym.reserved = 0;
h->esym.asym.index = indexNil;
}
if (h->root.root.type == bfd_link_hash_common)
h->esym.asym.value = h->root.root.u.c.size;
else if (h->root.root.type == bfd_link_hash_defined
|| h->root.root.type == bfd_link_hash_defweak)
{
if (h->esym.asym.sc == scCommon)
h->esym.asym.sc = scBss;
else if (h->esym.asym.sc == scSCommon)
h->esym.asym.sc = scSBss;
sec = h->root.root.u.def.section;
output_section = sec->output_section;
if (output_section != NULL)
h->esym.asym.value = (h->root.root.u.def.value
+ sec->output_offset
+ output_section->vma);
else
h->esym.asym.value = 0;
}
else if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
{
/* Set type and value for a symbol with a function stub. */
h->esym.asym.st = stProc;
sec = bfd_get_section_by_name (einfo->abfd, ".plt");
if (sec == NULL)
h->esym.asym.value = 0;
else
{
output_section = sec->output_section;
if (output_section != NULL)
h->esym.asym.value = (h->root.plt.offset
+ sec->output_offset
+ output_section->vma);
else
h->esym.asym.value = 0;
}
#if 0 /* FIXME? */
h->esym.ifd = 0;
#endif
}
if (! bfd_ecoff_debug_one_external (einfo->abfd, einfo->debug, einfo->swap,
h->root.root.root.string,
&h->esym))
{
einfo->failed = true;
return false;
}
return true;
}
/* FIXME: Create a runtime procedure table from the .mdebug section.
static boolean
mips_elf_create_procedure_table (handle, abfd, info, s, debug)
PTR handle;
bfd *abfd;
struct bfd_link_info *info;
asection *s;
struct ecoff_debug_info *debug;
*/
/* Handle dynamic relocations when doing an Alpha ELF link. */
static boolean
elf64_alpha_check_relocs (abfd, info, sec, relocs)
bfd *abfd;
struct bfd_link_info *info;
asection *sec;
const Elf_Internal_Rela *relocs;
{
bfd *dynobj;
asection *sreloc;
const char *rel_sec_name;
Elf_Internal_Shdr *symtab_hdr;
struct alpha_elf_link_hash_entry **sym_hashes;
struct alpha_elf_got_entry **local_got_entries;
const Elf_Internal_Rela *rel, *relend;
int got_created;
if (info->relocateable)
return true;
dynobj = elf_hash_table(info)->dynobj;
if (dynobj == NULL)
elf_hash_table(info)->dynobj = dynobj = abfd;
sreloc = NULL;
rel_sec_name = NULL;
symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
sym_hashes = alpha_elf_sym_hashes(abfd);
local_got_entries = alpha_elf_tdata(abfd)->local_got_entries;
got_created = 0;
relend = relocs + sec->reloc_count;
for (rel = relocs; rel < relend; ++rel)
{
unsigned long r_symndx, r_type;
struct alpha_elf_link_hash_entry *h;
r_symndx = ELF64_R_SYM (rel->r_info);
if (r_symndx < symtab_hdr->sh_info)
h = NULL;
else
{
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
while (h->root.root.type == bfd_link_hash_indirect
|| h->root.root.type == bfd_link_hash_warning)
h = (struct alpha_elf_link_hash_entry *)h->root.root.u.i.link;
h->root.elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
}
r_type = ELF64_R_TYPE (rel->r_info);
switch (r_type)
{
case R_ALPHA_LITERAL:
{
struct alpha_elf_got_entry *gotent;
int flags = 0;
if (h)
{
/* Search for and possibly create a got entry. */
for (gotent = h->got_entries; gotent ; gotent = gotent->next)
if (gotent->gotobj == abfd &&
gotent->addend == rel->r_addend)
break;
if (!gotent)
{
gotent = ((struct alpha_elf_got_entry *)
bfd_alloc (abfd,
sizeof (struct alpha_elf_got_entry)));
if (!gotent)
return false;
gotent->gotobj = abfd;
gotent->addend = rel->r_addend;
gotent->got_offset = -1;
gotent->flags = 0;
gotent->use_count = 1;
gotent->next = h->got_entries;
h->got_entries = gotent;
alpha_elf_tdata (abfd)->total_got_entries++;
}
else
gotent->use_count += 1;
}
else
{
/* This is a local .got entry -- record for merge. */
if (!local_got_entries)
{
size_t size;
size = (symtab_hdr->sh_info
* sizeof (struct alpha_elf_got_entry *));
local_got_entries = ((struct alpha_elf_got_entry **)
bfd_alloc (abfd, size));
if (!local_got_entries)
return false;
memset (local_got_entries, 0, size);
alpha_elf_tdata (abfd)->local_got_entries =
local_got_entries;
}
for (gotent = local_got_entries[ELF64_R_SYM(rel->r_info)];
gotent != NULL && gotent->addend != rel->r_addend;
gotent = gotent->next)
continue;
if (!gotent)
{
gotent = ((struct alpha_elf_got_entry *)
bfd_alloc (abfd,
sizeof (struct alpha_elf_got_entry)));
if (!gotent)
return false;
gotent->gotobj = abfd;
gotent->addend = rel->r_addend;
gotent->got_offset = -1;
gotent->flags = 0;
gotent->use_count = 1;
gotent->next = local_got_entries[ELF64_R_SYM(rel->r_info)];
local_got_entries[ELF64_R_SYM(rel->r_info)] = gotent;
alpha_elf_tdata(abfd)->total_got_entries++;
alpha_elf_tdata(abfd)->n_local_got_entries++;
}
else
gotent->use_count += 1;
}
/* Remember how this literal is used from its LITUSEs.
This will be important when it comes to decide if we can
create a .plt entry for a function symbol. */
if (rel+1 < relend
&& ELF64_R_TYPE (rel[1].r_info) == R_ALPHA_LITUSE)
{
do
{
++rel;
if (rel->r_addend >= 1 && rel->r_addend <= 3)
flags |= 1 << rel->r_addend;
}
while (rel+1 < relend &&
ELF64_R_TYPE (rel[1].r_info) == R_ALPHA_LITUSE);
}
else
{
/* No LITUSEs -- presumably the address is not being
loaded for nothing. */
flags = ALPHA_ELF_LINK_HASH_LU_ADDR;
}
gotent->flags |= flags;
if (h)
{
/* Make a guess as to whether a .plt entry will be needed. */
if ((h->flags |= flags) == ALPHA_ELF_LINK_HASH_LU_FUNC)
h->root.elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
else
h->root.elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
}
}
/* FALLTHRU */
case R_ALPHA_GPDISP:
case R_ALPHA_GPREL32:
case R_ALPHA_GPRELHIGH:
case R_ALPHA_GPRELLOW:
/* We don't actually use the .got here, but the sections must
be created before the linker maps input sections to output
sections. */
if (!got_created)
{
if (!elf64_alpha_create_got_section (abfd, info))
return false;
/* Make sure the object's gotobj is set to itself so
that we default to every object with its own .got.
We'll merge .gots later once we've collected each
object's info. */
alpha_elf_tdata(abfd)->gotobj = abfd;
got_created = 1;
}
break;
case R_ALPHA_SREL16:
case R_ALPHA_SREL32:
case R_ALPHA_SREL64:
if (h == NULL)
break;
/* FALLTHRU */
case R_ALPHA_REFLONG:
case R_ALPHA_REFQUAD:
if (rel_sec_name == NULL)
{
rel_sec_name = (bfd_elf_string_from_elf_section
(abfd, elf_elfheader(abfd)->e_shstrndx,
elf_section_data(sec)->rel_hdr.sh_name));
if (rel_sec_name == NULL)
return false;
BFD_ASSERT (strncmp (rel_sec_name, ".rela", 5) == 0
&& strcmp (bfd_get_section_name (abfd, sec),
rel_sec_name+5) == 0);
}
/* We need to create the section here now whether we eventually
use it or not so that it gets mapped to an output section by
the linker. If not used, we'll kill it in
size_dynamic_sections. */
if (sreloc == NULL)
{
sreloc = bfd_get_section_by_name (dynobj, rel_sec_name);
if (sreloc == NULL)
{
sreloc = bfd_make_section (dynobj, rel_sec_name);
if (sreloc == NULL
|| !bfd_set_section_flags (dynobj, sreloc,
((sec->flags & (SEC_ALLOC
| SEC_LOAD))
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
| SEC_READONLY))
|| !bfd_set_section_alignment (dynobj, sreloc, 3))
return false;
}
}
if (h)
{
/* Since we havn't seen all of the input symbols yet, we
don't know whether we'll actually need a dynamic relocation
entry for this reloc. So make a record of it. Once we
find out if this thing needs dynamic relocation we'll
expand the relocation sections by the appropriate amount. */
struct alpha_elf_reloc_entry *rent;
for (rent = h->reloc_entries; rent; rent = rent->next)
if (rent->rtype == r_type && rent->srel == sreloc)
break;
if (!rent)
{
rent = ((struct alpha_elf_reloc_entry *)
bfd_alloc (abfd,
sizeof (struct alpha_elf_reloc_entry)));
if (!rent)
return false;
rent->srel = sreloc;
rent->rtype = r_type;
rent->count = 1;
rent->next = h->reloc_entries;
h->reloc_entries = rent;
}
else
rent->count++;
}
else if (info->shared && (sec->flags & SEC_ALLOC))
{
/* If this is a shared library, and the section is to be
loaded into memory, we need a RELATIVE reloc. */
sreloc->_raw_size += sizeof (Elf64_External_Rela);
}
break;
}
}
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
elf64_alpha_adjust_dynamic_symbol (info, h)
struct bfd_link_info *info;
struct elf_link_hash_entry *h;
{
bfd *dynobj;
asection *s;
struct alpha_elf_link_hash_entry *ah;
dynobj = elf_hash_table(info)->dynobj;
ah = (struct alpha_elf_link_hash_entry *)h;
/* Now that we've seen all of the input symbols, finalize our decision
about whether this symbol should get a .plt entry. */
if (h->root.type != bfd_link_hash_undefweak
&& alpha_elf_dynamic_symbol_p (h, info)
&& ((h->type == STT_FUNC
&& !(ah->flags & ALPHA_ELF_LINK_HASH_LU_ADDR))
|| (h->type == STT_NOTYPE
&& ah->flags == ALPHA_ELF_LINK_HASH_LU_FUNC))
/* Don't prevent otherwise valid programs from linking by attempting
to create a new .got entry somewhere. A Correct Solution would be
to add a new .got section to a new object file and let it be merged
somewhere later. But for now don't bother. */
&& ah->got_entries)
{
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
s = bfd_get_section_by_name(dynobj, ".plt");
if (!s && !elf64_alpha_create_dynamic_sections (dynobj, info))
return false;
/* The first bit of the .plt is reserved. */
if (s->_raw_size == 0)
s->_raw_size = PLT_HEADER_SIZE;
h->plt.offset = s->_raw_size;
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 the location
in the .plt. This is required to make function pointers compare
equal between the normal executable and the shared library. */
if (! info->shared
&& h->root.type != bfd_link_hash_defweak)
{
h->root.u.def.section = s;
h->root.u.def.value = h->plt.offset;
}
/* We also need a JMP_SLOT entry in the .rela.plt section. */
s = bfd_get_section_by_name (dynobj, ".rela.plt");
BFD_ASSERT (s != NULL);
s->_raw_size += sizeof (Elf64_External_Rela);
return true;
}
else
h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
/* 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. The Alpha, since it uses .got entries for all
symbols even in regular objects, does not need the hackery of a
.dynbss section and COPY dynamic relocations. */
return true;
}
/* Symbol versioning can create new symbols, and make our old symbols
indirect to the new ones. Consolidate the got and reloc information
in these situations. */
static boolean
elf64_alpha_merge_ind_symbols (hi, dummy)
struct alpha_elf_link_hash_entry *hi;
PTR dummy ATTRIBUTE_UNUSED;
{
struct alpha_elf_link_hash_entry *hs;
if (hi->root.root.type != bfd_link_hash_indirect)
return true;
hs = hi;
do {
hs = (struct alpha_elf_link_hash_entry *)hs->root.root.u.i.link;
} while (hs->root.root.type == bfd_link_hash_indirect);
/* Merge the flags. Whee. */
hs->flags |= hi->flags;
/* Merge the .got entries. Cannibalize the old symbol's list in
doing so, since we don't need it anymore. */
if (hs->got_entries == NULL)
hs->got_entries = hi->got_entries;
else
{
struct alpha_elf_got_entry *gi, *gs, *gin, *gsh;
gsh = hs->got_entries;
for (gi = hi->got_entries; gi ; gi = gin)
{
gin = gi->next;
for (gs = gsh; gs ; gs = gs->next)
if (gi->gotobj == gs->gotobj && gi->addend == gs->addend)
goto got_found;
gi->next = hs->got_entries;
hs->got_entries = gi;
got_found:;
}
}
hi->got_entries = NULL;
/* And similar for the reloc entries. */