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/* Alpha specific support for 64-bit ELF
Copyright (C) 1996-2016 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* We need a published ABI spec for this. Until one comes out, don't
assume this'll remain unchanged forever. */
#include "sysdep.h"
#include "bfd.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"
/* Instruction data for plt generation and relaxation. */
#define OP_LDA 0x08
#define OP_LDAH 0x09
#define OP_LDQ 0x29
#define OP_BR 0x30
#define OP_BSR 0x34
#define INSN_LDA (OP_LDA << 26)
#define INSN_LDAH (OP_LDAH << 26)
#define INSN_LDQ (OP_LDQ << 26)
#define INSN_BR (OP_BR << 26)
#define INSN_ADDQ 0x40000400
#define INSN_RDUNIQ 0x0000009e
#define INSN_SUBQ 0x40000520
#define INSN_S4SUBQ 0x40000560
#define INSN_UNOP 0x2ffe0000
#define INSN_JSR 0x68004000
#define INSN_JMP 0x68000000
#define INSN_JSR_MASK 0xfc00c000
#define INSN_A(I,A) (I | (A << 21))
#define INSN_AB(I,A,B) (I | (A << 21) | (B << 16))
#define INSN_ABC(I,A,B,C) (I | (A << 21) | (B << 16) | C)
#define INSN_ABO(I,A,B,O) (I | (A << 21) | (B << 16) | ((O) & 0xffff))
#define INSN_AD(I,A,D) (I | (A << 21) | (((D) >> 2) & 0x1fffff))
/* PLT/GOT Stuff */
/* Set by ld emulation. Putting this into the link_info or hash structure
is simply working too hard. */
#ifdef USE_SECUREPLT
bfd_boolean elf64_alpha_use_secureplt = TRUE;
#else
bfd_boolean elf64_alpha_use_secureplt = FALSE;
#endif
#define OLD_PLT_HEADER_SIZE 32
#define OLD_PLT_ENTRY_SIZE 12
#define NEW_PLT_HEADER_SIZE 36
#define NEW_PLT_ENTRY_SIZE 4
#define PLT_HEADER_SIZE \
(elf64_alpha_use_secureplt ? NEW_PLT_HEADER_SIZE : OLD_PLT_HEADER_SIZE)
#define PLT_ENTRY_SIZE \
(elf64_alpha_use_secureplt ? NEW_PLT_ENTRY_SIZE : OLD_PLT_ENTRY_SIZE)
#define MAX_GOT_SIZE (64*1024)
#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so"
/* 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;
/* The .plt offset for this entry. */
int plt_offset;
/* How many references to this entry? */
int use_count;
/* The relocation type of this entry. */
unsigned char reloc_type;
/* How a LITERAL is used. */
unsigned char flags;
/* Have we initialized the dynamic relocation for this entry? */
unsigned char reloc_done;
/* Have we adjusted this entry for SEC_MERGE? */
unsigned char reloc_xlated;
};
struct alpha_elf_reloc_entry
{
struct alpha_elf_reloc_entry *next;
/* Which .reloc section? */
asection *srel;
/* What kind of relocation? */
unsigned int rtype;
/* Is this against read-only section? */
unsigned int reltext : 1;
/* How many did we find? */
unsigned long count;
};
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 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_JSR 0x08
#define ALPHA_ELF_LINK_HASH_LU_TLSGD 0x10
#define ALPHA_ELF_LINK_HASH_LU_TLSLDM 0x20
#define ALPHA_ELF_LINK_HASH_LU_JSRDIRECT 0x40
#define ALPHA_ELF_LINK_HASH_LU_PLT 0x38
#define ALPHA_ELF_LINK_HASH_TLS_IE 0x80
/* Used to implement multiple .got subsections. */
struct alpha_elf_got_entry *got_entries;
/* Used to count non-got, non-plt relocations for delayed sizing
of relocation sections. */
struct alpha_elf_reloc_entry *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;
/* The most recent relax pass that we've seen. The GOTs
should be regenerated if this doesn't match. */
int relax_trip;
};
/* 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, \
(bfd_boolean (*) (struct elf_link_hash_entry *, void *)) (func), \
(info)))
/* Get the Alpha ELF linker hash table from a link_info structure. */
#define alpha_elf_hash_table(p) \
(elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
== ALPHA_ELF_DATA ? ((struct alpha_elf_link_hash_table *) ((p)->hash)) : NULL)
/* 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? This differs from the
generic version in that we never need to consider function pointer
equality wrt PLT entries -- we don't create a PLT entry if a symbol's
address is ever taken. */
static inline bfd_boolean
alpha_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
struct bfd_link_info *info)
{
return _bfd_elf_dynamic_symbol_p (h, info, 0);
}
/* Create an entry in a Alpha ELF linker hash table. */
static struct bfd_hash_entry *
elf64_alpha_link_hash_newfunc (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 (bfd *abfd)
{
struct alpha_elf_link_hash_table *ret;
bfd_size_type amt = sizeof (struct alpha_elf_link_hash_table);
ret = (struct alpha_elf_link_hash_table *) bfd_zmalloc (amt);
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,
sizeof (struct alpha_elf_link_hash_entry),
ALPHA_ELF_DATA))
{
free (ret);
return NULL;
}
return &ret->root.root;
}
/* Alpha ELF follows MIPS ELF in using a special find_nearest_line
routine in order to handle the ECOFF debugging information. */
struct alpha_elf_find_line
{
struct ecoff_debug_info d;
struct ecoff_find_line i;
};
/* 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 words. */
int total_got_size;
/* For every got, this is the sum of the number of words required
to hold all of the member object's local got. */
int local_got_size;
/* Used by elf64_alpha_find_nearest_line entry point. */
struct alpha_elf_find_line *find_line_info;
};
#define alpha_elf_tdata(abfd) \
((struct alpha_elf_obj_tdata *) (abfd)->tdata.any)
#define is_alpha_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& elf_tdata (bfd) != NULL \
&& elf_object_id (bfd) == ALPHA_ELF_DATA)
static bfd_boolean
elf64_alpha_mkobject (bfd *abfd)
{
return bfd_elf_allocate_object (abfd, sizeof (struct alpha_elf_obj_tdata),
ALPHA_ELF_DATA);
}
static bfd_boolean
elf64_alpha_object_p (bfd *abfd)
{
/* Set the right machine number for an Alpha ELF file. */
return bfd_default_set_arch_mach (abfd, bfd_arch_alpha, 0);
}
/* A relocation function which doesn't do anything. */
static bfd_reloc_status_type
elf64_alpha_reloc_nil (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc,
asymbol *sym ATTRIBUTE_UNUSED,
void * 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 (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc,
asymbol *sym ATTRIBUTE_UNUSED,
void * 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 (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, (bfd_vma) i_ldah, p_ldah);
bfd_put_32 (abfd, (bfd_vma) i_lda, p_lda);
return ret;
}
/* The special function for the GPDISP reloc. */
static bfd_reloc_status_type
elf64_alpha_reloc_gpdisp (bfd *abfd, arelent *reloc_entry,
asymbol *sym ATTRIBUTE_UNUSED, void * data,
asection *input_section, bfd *output_bfd,
char **err_msg)
{
bfd_reloc_status_type ret;
bfd_vma gp, relocation;
bfd_vma high_address;
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;
}
high_address = bfd_get_section_limit (abfd, input_section);
if (reloc_entry->address > high_address
|| reloc_entry->address + reloc_entry->addend > high_address)
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;
}
/* 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)
#define SKIP_HOWTO(N) \
HOWTO(N, 0, 0, 0, 0, 0, complain_overflow_dont, elf64_alpha_reloc_bad, 0, 0, 0, 0, 0)
static reloc_howto_type elf64_alpha_howto_table[] =
{
HOWTO (R_ALPHA_NONE, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = short, 2 = long) */
0, /* 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 */
bfd_elf_generic_reloc, /* 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 */
bfd_elf_generic_reloc, /* 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 */
bfd_elf_generic_reloc, /* 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 */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"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 */
1, /* 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 */
bfd_elf_generic_reloc, /* 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 */
1, /* size (0 = byte, 1 = short, 2 = long) */
14, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* 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 */
bfd_elf_generic_reloc, /* 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 */
bfd_elf_generic_reloc, /* 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 */
bfd_elf_generic_reloc, /* special_function */
"SREL64", /* name */
FALSE, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
TRUE), /* pcrel_offset */
/* Skip 12 - 16; deprecated ECOFF relocs. */
SKIP_HOWTO (12),
SKIP_HOWTO (13),
SKIP_HOWTO (14),
SKIP_HOWTO (15),
SKIP_HOWTO (16),
/* The high 16 bits of the displacement from GP to the target. */
HOWTO (R_ALPHA_GPRELHIGH,
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"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 */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"GPRELLOW", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16-bit displacement from the GP to the target. */
HOWTO (R_ALPHA_GPREL16,
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"GPREL16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Skip 20 - 23; deprecated ECOFF relocs. */
SKIP_HOWTO (20),
SKIP_HOWTO (21),
SKIP_HOWTO (22),
SKIP_HOWTO (23),
/* 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 21 bit branch that adjusts for gp loads. */
HOWTO (R_ALPHA_BRSGP, /* type */
2, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
21, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"BRSGP", /* name */
FALSE, /* partial_inplace */
0x1fffff, /* src_mask */
0x1fffff, /* dst_mask */
TRUE), /* pcrel_offset */
/* Creates a tls_index for the symbol in the got. */
HOWTO (R_ALPHA_TLSGD, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TLSGD", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Creates a tls_index for the (current) module in the got. */
HOWTO (R_ALPHA_TLSLDM, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TLSLDM", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A dynamic relocation for a DTP module entry. */
HOWTO (R_ALPHA_DTPMOD64, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"DTPMOD64", /* name */
FALSE, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
FALSE), /* pcrel_offset */
/* Creates a 64-bit offset in the got for the displacement
from DTP to the target. */
HOWTO (R_ALPHA_GOTDTPREL, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"GOTDTPREL", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A dynamic relocation for a displacement from DTP to the target. */
HOWTO (R_ALPHA_DTPREL64, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"DTPREL64", /* name */
FALSE, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
FALSE), /* pcrel_offset */
/* The high 16 bits of the displacement from DTP to the target. */
HOWTO (R_ALPHA_DTPRELHI, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"DTPRELHI", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* The low 16 bits of the displacement from DTP to the target. */
HOWTO (R_ALPHA_DTPRELLO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"DTPRELLO", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16-bit displacement from DTP to the target. */
HOWTO (R_ALPHA_DTPREL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"DTPREL16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* Creates a 64-bit offset in the got for the displacement
from TP to the target. */
HOWTO (R_ALPHA_GOTTPREL, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"GOTTPREL", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A dynamic relocation for a displacement from TP to the target. */
HOWTO (R_ALPHA_TPREL64, /* type */
0, /* rightshift */
4, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TPREL64", /* name */
FALSE, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
FALSE), /* pcrel_offset */
/* The high 16 bits of the displacement from TP to the target. */
HOWTO (R_ALPHA_TPRELHI, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TPRELHI", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* The low 16 bits of the displacement from TP to the target. */
HOWTO (R_ALPHA_TPRELLO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TPRELLO", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16-bit displacement from TP to the target. */
HOWTO (R_ALPHA_TPREL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"TPREL16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
};
/* 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},
{BFD_RELOC_ALPHA_GPREL_HI16, R_ALPHA_GPRELHIGH},
{BFD_RELOC_ALPHA_GPREL_LO16, R_ALPHA_GPRELLOW},
{BFD_RELOC_GPREL16, R_ALPHA_GPREL16},
{BFD_RELOC_ALPHA_BRSGP, R_ALPHA_BRSGP},
{BFD_RELOC_ALPHA_TLSGD, R_ALPHA_TLSGD},
{BFD_RELOC_ALPHA_TLSLDM, R_ALPHA_TLSLDM},
{BFD_RELOC_ALPHA_DTPMOD64, R_ALPHA_DTPMOD64},
{BFD_RELOC_ALPHA_GOTDTPREL16, R_ALPHA_GOTDTPREL},
{BFD_RELOC_ALPHA_DTPREL64, R_ALPHA_DTPREL64},
{BFD_RELOC_ALPHA_DTPREL_HI16, R_ALPHA_DTPRELHI},
{BFD_RELOC_ALPHA_DTPREL_LO16, R_ALPHA_DTPRELLO},
{BFD_RELOC_ALPHA_DTPREL16, R_ALPHA_DTPREL16},
{BFD_RELOC_ALPHA_GOTTPREL16, R_ALPHA_GOTTPREL},
{BFD_RELOC_ALPHA_TPREL64, R_ALPHA_TPREL64},
{BFD_RELOC_ALPHA_TPREL_HI16, R_ALPHA_TPRELHI},
{BFD_RELOC_ALPHA_TPREL_LO16, R_ALPHA_TPRELLO},
{BFD_RELOC_ALPHA_TPREL16, R_ALPHA_TPREL16},
};
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
elf64_alpha_bfd_reloc_type_lookup (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;
}
static reloc_howto_type *
elf64_alpha_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < (sizeof (elf64_alpha_howto_table)
/ sizeof (elf64_alpha_howto_table[0]));
i++)
if (elf64_alpha_howto_table[i].name != NULL
&& strcasecmp (elf64_alpha_howto_table[i].name, r_name) == 0)
return &elf64_alpha_howto_table[i];
return NULL;
}
/* Given an Alpha ELF reloc type, fill in an arelent structure. */
static void
elf64_alpha_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned r_type = ELF64_R_TYPE(dst->r_info);
if (r_type >= R_ALPHA_max)
{
(*_bfd_error_handler) (_("%B: unrecognised Alpha reloc number: %d"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
r_type = R_ALPHA_NONE;
}
cache_ptr->howto = &elf64_alpha_howto_table[r_type];
}
/* These two relocations create a two-word entry in the got. */
#define alpha_got_entry_size(r_type) \
(r_type == R_ALPHA_TLSGD || r_type == R_ALPHA_TLSLDM ? 16 : 8)
/* This is PT_TLS segment p_vaddr. */
#define alpha_get_dtprel_base(info) \
(elf_hash_table (info)->tls_sec->vma)
/* Main program TLS (whose template starts at PT_TLS p_vaddr)
is assigned offset round(16, PT_TLS p_align). */
#define alpha_get_tprel_base(info) \
(elf_hash_table (info)->tls_sec->vma \
- align_power ((bfd_vma) 16, \
elf_hash_table (info)->tls_sec->alignment_power))
/* Handle an Alpha specific section when reading an object file. This
is called when bfd_section_from_shdr 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 bfd_boolean
elf64_alpha_section_from_shdr (bfd *abfd,
Elf_Internal_Shdr *hdr,
const char *name,
int shindex)
{
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;
default:
return FALSE;
}
if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
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;
}
return TRUE;
}
/* Convert Alpha specific section flags to bfd internal section flags. */
static bfd_boolean
elf64_alpha_section_flags (flagword *flags, const Elf_Internal_Shdr *hdr)
{
if (hdr->sh_flags & SHF_ALPHA_GPREL)
*flags |= SEC_SMALL_DATA;
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 bfd_boolean
elf64_alpha_fake_sections (bfd *abfd, Elf_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;
}
else if ((sec->flags & SEC_SMALL_DATA)
|| 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 bfd_boolean
elf64_alpha_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
Elf_Internal_Sym *sym,
const char **namep ATTRIBUTE_UNUSED,
flagword *flagsp ATTRIBUTE_UNUSED,
asection **secp, bfd_vma *valp)
{
if (sym->st_shndx == SHN_COMMON
&& !bfd_link_relocatable (info)
&& sym->st_size <= elf_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_with_flags (abfd, ".scommon",
(SEC_ALLOC
| SEC_IS_COMMON
| SEC_LINKER_CREATED));
if (scomm == NULL)
return FALSE;
}
*secp = scomm;
*valp = sym->st_size;
}
return TRUE;
}
/* Create the .got section. */
static bfd_boolean
elf64_alpha_create_got_section (bfd *abfd,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
flagword flags;
asection *s;
if (! is_alpha_elf (abfd))
return FALSE;
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
if (s == NULL
|| !bfd_set_section_alignment (abfd, s, 3))
return FALSE;
alpha_elf_tdata (abfd)->got = s;
/* 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;
return TRUE;
}
/* Create all the dynamic sections. */
static bfd_boolean
elf64_alpha_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
{
asection *s;
flagword flags;
struct elf_link_hash_entry *h;
if (! is_alpha_elf (abfd))
return FALSE;
/* We need to create .plt, .rela.plt, .got, and .rela.got sections. */
flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED
| (elf64_alpha_use_secureplt ? SEC_READONLY : 0));
s = bfd_make_section_anyway_with_flags (abfd, ".plt", flags);
if (s == NULL || ! bfd_set_section_alignment (abfd, s, 4))
return FALSE;
/* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
.plt section. */
h = _bfd_elf_define_linkage_sym (abfd, info, s,
"_PROCEDURE_LINKAGE_TABLE_");
elf_hash_table (info)->hplt = h;
if (h == NULL)
return FALSE;
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED | SEC_READONLY);
s = bfd_make_section_anyway_with_flags (abfd, ".rela.plt", flags);
if (s == NULL || ! bfd_set_section_alignment (abfd, s, 3))
return FALSE;
if (elf64_alpha_use_secureplt)
{
flags = SEC_ALLOC | SEC_LINKER_CREATED;
s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
if (s == NULL || ! 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 (alpha_elf_tdata(abfd)->gotobj == NULL)
{
if (!elf64_alpha_create_got_section (abfd, info))
return FALSE;
}
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED | SEC_READONLY);
s = bfd_make_section_anyway_with_flags (abfd, ".rela.got", flags);
if (s == NULL
|| !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 = _bfd_elf_define_linkage_sym (abfd, info, alpha_elf_tdata(abfd)->got,
"_GLOBAL_OFFSET_TABLE_");
elf_hash_table (info)->hgot = h;
if (h == NULL)
return FALSE;
return TRUE;
}
/* Read ECOFF debugging information from a .mdebug section into a
ecoff_debug_info structure. */
static bfd_boolean
elf64_alpha_read_ecoff_info (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 (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))
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 \
{ \
bfd_size_type amt = (bfd_size_type) size * symhdr->count; \
debug->ptr = (type) bfd_malloc (amt); \
if (debug->ptr == NULL) \
goto error_return; \
if (bfd_seek (abfd, (file_ptr) symhdr->offset, SEEK_SET) != 0 \
|| bfd_bread (debug->ptr, amt, abfd) != amt) \
goto error_return; \
}
READ (line, cbLineOffset, cbLine, sizeof (unsigned char), unsigned char *);
READ (external_dnr, cbDnOffset, idnMax, swap->external_dnr_size, void *);
READ (external_pdr, cbPdOffset, ipdMax, swap->external_pdr_size, void *);
READ (external_sym, cbSymOffset, isymMax, swap->external_sym_size, void *);
READ (external_opt, cbOptOffset, ioptMax, swap->external_opt_size, void *);
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, void *);
READ (external_rfd, cbRfdOffset, crfd, swap->external_rfd_size, void *);
READ (external_ext, cbExtOffset, iextMax, swap->external_ext_size, void *);
#undef READ
debug->fdr = 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 '$'. */
static bfd_boolean
elf64_alpha_is_local_label_name (bfd *abfd ATTRIBUTE_UNUSED, const char *name)
{
return name[0] == '$';
}
static bfd_boolean
elf64_alpha_find_nearest_line (bfd *abfd, asymbol **symbols,
asection *section, bfd_vma offset,
const char **filename_ptr,
const char **functionname_ptr,
unsigned int *line_ptr,
unsigned int *discriminator_ptr)
{
asection *msec;
if (_bfd_dwarf2_find_nearest_line (abfd, symbols, NULL, section, offset,
filename_ptr, functionname_ptr,
line_ptr, discriminator_ptr,
dwarf_debug_sections, 0,
&elf_tdata (abfd)->dwarf2_find_line_info))
return TRUE;
msec = bfd_get_section_by_name (abfd, ".mdebug");
if (msec != NULL)
{
flagword origflags;
struct alpha_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 = alpha_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;
bfd_size_type amt = sizeof (struct alpha_elf_find_line);
fi = (struct alpha_elf_find_line *) bfd_zalloc (abfd, amt);
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. */
amt = fi->d.symbolic_header.ifdMax * sizeof (struct fdr);
fi->d.fdr = (struct fdr *) bfd_alloc (abfd, amt);
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, fraw_src, fdr_ptr);
alpha_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, symbols, section, offset,
filename_ptr, functionname_ptr,
line_ptr, discriminator_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;
bfd_boolean failed;
};
static bfd_boolean
elf64_alpha_output_extsym (struct alpha_elf_link_hash_entry *h, void * data)
{
struct extsym_info *einfo = (struct extsym_info *) data;
bfd_boolean strip;
asection *sec, *output_section;
if (h->root.indx == -2)
strip = FALSE;
else if ((h->root.def_dynamic
|| h->root.ref_dynamic
|| h->root.root.type == bfd_link_hash_new)
&& !h->root.def_regular
&& !h->root.ref_regular)
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;
}
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;
}
/* Search for and possibly create a got entry. */
static struct alpha_elf_got_entry *
get_got_entry (bfd *abfd, struct alpha_elf_link_hash_entry *h,
unsigned long r_type, unsigned long r_symndx,
bfd_vma r_addend)
{
struct alpha_elf_got_entry *gotent;
struct alpha_elf_got_entry **slot;
if (h)
slot = &h->got_entries;
else
{
/* This is a local .got entry -- record for merge. */
struct alpha_elf_got_entry **local_got_entries;
local_got_entries = alpha_elf_tdata(abfd)->local_got_entries;
if (!local_got_entries)
{
bfd_size_type size;
Elf_Internal_Shdr *symtab_hdr;
symtab_hdr = &elf_tdata(abfd)->symtab_hdr;
size = symtab_hdr->sh_info;
size *= sizeof (struct alpha_elf_got_entry *);
local_got_entries
= (struct alpha_elf_got_entry **) bfd_zalloc (abfd, size);
if (!local_got_entries)
return NULL;
alpha_elf_tdata (abfd)->local_got_entries = local_got_entries;
}
slot = &local_got_entries[r_symndx];
}
for (gotent = *slot; gotent ; gotent = gotent->next)
if (gotent->gotobj == abfd
&& gotent->reloc_type == r_type
&& gotent->addend == r_addend)
break;
if (!gotent)
{
int entry_size;
bfd_size_type amt;
amt = sizeof (struct alpha_elf_got_entry);
gotent = (struct alpha_elf_got_entry *) bfd_alloc (abfd, amt);
if (!gotent)
return NULL;
gotent->gotobj = abfd;
gotent->addend = r_addend;
gotent->got_offset = -1;
gotent->plt_offset = -1;
gotent->use_count = 1;
gotent->reloc_type = r_type;
gotent->reloc_done = 0;
gotent->reloc_xlated = 0;
gotent->next = *slot;
*slot = gotent;
entry_size = alpha_got_entry_size (r_type);
alpha_elf_tdata (abfd)->total_got_size += entry_size;
if (!h)
alpha_elf_tdata(abfd)->local_got_size += entry_size;
}
else
gotent->use_count += 1;
return gotent;
}
static bfd_boolean
elf64_alpha_want_plt (struct alpha_elf_link_hash_entry *ah)
{
return ((ah->root.type == STT_FUNC
|| ah->root.root.type == bfd_link_hash_undefweak
|| ah->root.root.type == bfd_link_hash_undefined)
&& (ah->flags & ALPHA_ELF_LINK_HASH_LU_PLT) != 0
&& (ah->flags & ~ALPHA_ELF_LINK_HASH_LU_PLT) == 0);
}
/* Whether to sort relocs output by ld -r or ld --emit-relocs, by r_offset.
Don't do so for code sections. We want to keep ordering of LITERAL/LITUSE
as is. On the other hand, elf-eh-frame.c processing requires .eh_frame
relocs to be sorted. */
static bfd_boolean
elf64_alpha_sort_relocs_p (asection *sec)
{
return (sec->flags & SEC_CODE) == 0;
}
/* Handle dynamic relocations when doing an Alpha ELF link. */
static bfd_boolean
elf64_alpha_check_relocs (bfd *abfd, struct bfd_link_info *info,
asection *sec, const Elf_Internal_Rela *relocs)
{
bfd *dynobj;
asection *sreloc;
Elf_Internal_Shdr *symtab_hdr;
struct alpha_elf_link_hash_entry **sym_hashes;
const Elf_Internal_Rela *rel, *relend;
bfd_size_type amt;
if (bfd_link_relocatable (info))
return TRUE;
/* Don't do anything special with non-loaded, non-alloced sections.
In particular, any relocs in such sections should not affect GOT
and PLT reference counting (ie. we don't allow them to create GOT
or PLT entries), there's no possibility or desire to optimize TLS
relocs, and there's not much point in propagating relocs to shared
libs that the dynamic linker won't relocate. */
if ((sec->flags & SEC_ALLOC) == 0)
return TRUE;
BFD_ASSERT (is_alpha_elf (abfd));
dynobj = elf_hash_table (info)->dynobj;
if (dynobj == NULL)
elf_hash_table (info)->dynobj = dynobj = abfd;
sreloc = NULL;
symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = alpha_elf_sym_hashes (abfd);
relend = relocs + sec->reloc_count;
for (rel = relocs; rel < relend; ++rel)
{
enum {
NEED_GOT = 1,
NEED_GOT_ENTRY = 2,
NEED_DYNREL = 4
};
unsigned long r_symndx, r_type;
struct alpha_elf_link_hash_entry *h;
unsigned int gotent_flags;
bfd_boolean maybe_dynamic;
unsigned int need;
bfd_vma addend;
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;
/* PR15323, ref flags aren't set for references in the same
object. */
h->root.root.non_ir_ref = 1;
h->root.ref_regular = 1;
}
/* We can only get preliminary data on whether a symbol is
locally or externally defined, as not all of the input files
have yet been processed. Do something with what we know, as
this may help reduce memory usage and processing time later. */
maybe_dynamic = FALSE;
if (h && ((bfd_link_pic (info)
&& (!info->symbolic
|| info->unresolved_syms_in_shared_libs == RM_IGNORE))
|| !h->root.def_regular
|| h->root.root.type == bfd_link_hash_defweak))
maybe_dynamic = TRUE;
need = 0;
gotent_flags = 0;
r_type = ELF64_R_TYPE (rel->r_info);
addend = rel->r_addend;
switch (r_type)
{
case R_ALPHA_LITERAL:
need = NEED_GOT | NEED_GOT_ENTRY;
/* 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. */
while (++rel < relend && ELF64_R_TYPE (rel->r_info) == R_ALPHA_LITUSE)
if (rel->r_addend >= 1 && rel->r_addend <= 6)
gotent_flags |= 1 << rel->r_addend;
--rel;
/* No LITUSEs -- presumably the address is used somehow. */
if (gotent_flags == 0)
gotent_flags = ALPHA_ELF_LINK_HASH_LU_ADDR;
break;
case R_ALPHA_GPDISP:
case R_ALPHA_GPREL16:
case R_ALPHA_GPREL32:
case R_ALPHA_GPRELHIGH:
case R_ALPHA_GPRELLOW:
case R_ALPHA_BRSGP:
need = NEED_GOT;
break;
case R_ALPHA_REFLONG:
case R_ALPHA_REFQUAD:
if (bfd_link_pic (info) || maybe_dynamic)
need = NEED_DYNREL;
break;
case R_ALPHA_TLSLDM:
/* The symbol for a TLSLDM reloc is ignored. Collapse the
reloc to the STN_UNDEF (0) symbol so that they all match. */
r_symndx = STN_UNDEF;
h = 0;
maybe_dynamic = FALSE;
/* FALLTHRU */
case R_ALPHA_TLSGD:
case R_ALPHA_GOTDTPREL:
need = NEED_GOT | NEED_GOT_ENTRY;
break;
case R_ALPHA_GOTTPREL:
need = NEED_GOT | NEED_GOT_ENTRY;
gotent_flags = ALPHA_ELF_LINK_HASH_TLS_IE;
if (bfd_link_pic (info))
info->flags |= DF_STATIC_TLS;
break;
case R_ALPHA_TPREL64:
if (bfd_link_dll (info))
{
info->flags |= DF_STATIC_TLS;
need = NEED_DYNREL;
}
else if (maybe_dynamic)
need = NEED_DYNREL;
break;
}
if (need & NEED_GOT)
{
if (alpha_elf_tdata(abfd)->gotobj == NULL)
{
if (!elf64_alpha_create_got_section (abfd, info))
return FALSE;
}
}
if (need & NEED_GOT_ENTRY)
{
struct alpha_elf_got_entry *gotent;
gotent = get_got_entry (abfd, h, r_type, r_symndx, addend);
if (!gotent)
return FALSE;
if (gotent_flags)
{
gotent->flags |= gotent_flags;
if (h)
{
gotent_flags |= h->flags;
h->flags = gotent_flags;
/* Make a guess as to whether a .plt entry is needed. */
/* ??? It appears that we won't make it into
adjust_dynamic_symbol for symbols that remain
totally undefined. Copying this check here means
we can create a plt entry for them too. */
h->root.needs_plt
= (maybe_dynamic && elf64_alpha_want_plt (h));
}
}
}
if (need & NEED_DYNREL)
{
/* 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_elf_make_dynamic_reloc_section
(sec, dynobj, 3, abfd, /*rela?*/ TRUE);
if (sreloc == NULL)
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)
{
amt = sizeof (struct alpha_elf_reloc_entry);
rent = (struct alpha_elf_reloc_entry *) bfd_alloc (abfd, amt);
if (!rent)
return FALSE;
rent->srel = sreloc;
rent->rtype = r_type;
rent->count = 1;
rent->reltext = (sec->flags & SEC_READONLY) != 0;
rent->next = h->reloc_entries;
h->reloc_entries = rent;
}
else
rent->count++;
}
else if (bfd_link_pic (info))
{
/* If this is a shared library, and the section is to be
loaded into memory, we need a RELATIVE reloc. */
sreloc->size += sizeof (Elf64_External_Rela);
if (sec->flags & SEC_READONLY)
info->flags |= DF_TEXTREL;
}
}
}
return TRUE;
}
/* Return the section that should be marked against GC for a given
relocation. */
static asection *
elf64_alpha_gc_mark_hook (asection *sec, struct bfd_link_info *info,
Elf_Internal_Rela *rel,
struct elf_link_hash_entry *h, Elf_Internal_Sym *sym)
{
/* These relocations don't really reference a symbol. Instead we store
extra data in their addend slot. Ignore the symbol. */
switch (ELF64_R_TYPE (rel->r_info))
{
case R_ALPHA_LITUSE:
case R_ALPHA_GPDISP:
case R_ALPHA_HINT:
return NULL;
}
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
/* Update the got entry reference counts for the section being removed. */
static bfd_boolean
elf64_alpha_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
asection *sec, const Elf_Internal_Rela *relocs)
{
Elf_Internal_Shdr *symtab_hdr;
struct alpha_elf_link_hash_entry **sym_hashes;
const Elf_Internal_Rela *rel, *relend;
if (bfd_link_relocatable (info))
return TRUE;
symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = alpha_elf_sym_hashes (abfd);
relend = relocs + sec->reloc_count;
for (rel = relocs; rel < relend; rel++)
{
unsigned long r_symndx, r_type;
struct alpha_elf_link_hash_entry *h = NULL;
struct alpha_elf_got_entry *gotent;
r_symndx = ELF64_R_SYM (rel->r_info);
if (r_symndx >= symtab_hdr->sh_info)
{
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;
}
r_type = ELF64_R_TYPE (rel->r_info);
switch (r_type)
{
case R_ALPHA_LITERAL:
/* ??? Ignore re-computation of gotent_flags. We're not
carrying a use-count for each bit in that mask. */
case R_ALPHA_TLSGD:
case R_ALPHA_GOTDTPREL:
case R_ALPHA_GOTTPREL:
/* Fetch the got entry from the tables. */
gotent = get_got_entry (abfd, h, r_type, r_symndx, rel->r_addend);
/* The got entry *must* exist, since we should have created it
before during check_relocs. Also note that get_got_entry
assumed this was going to be another use, and so incremented
the use count again. Thus the use count must be at least the
one real use and the "use" we just added. */
if (gotent == NULL || gotent->use_count < 2)
{
abort ();
return FALSE;
}
gotent->use_count -= 2;
break;
default:
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 bfd_boolean
elf64_alpha_adjust_dynamic_symbol (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. Irritatingly, it
is common for folk to leave undefined symbols in shared libraries,
and they still expect lazy binding; accept undefined symbols in lieu
of STT_FUNC. */
if (alpha_elf_dynamic_symbol_p (h, info) && elf64_alpha_want_plt (ah))
{
h->needs_plt = TRUE;
s = bfd_get_linker_section (dynobj, ".plt");
if (!s && !elf64_alpha_create_dynamic_sections (dynobj, info))
return FALSE;
/* We need one plt entry per got subsection. Delay allocation of
the actual plt entries until size_plt_section, called from
size_dynamic_sections or during relaxation. */
return TRUE;
}
else
h->needs_plt = FALSE;
/* 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->u.weakdef != NULL)
{
BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
|| h->u.weakdef->root.type == bfd_link_hash_defweak);
h->root.u.def.section = h->u.weakdef->root.u.def.section;
h->root.u.def.value = h->u.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;
}
/* Record STO_ALPHA_NOPV and STO_ALPHA_STD_GPLOAD. */
static void
elf64_alpha_merge_symbol_attribute (struct elf_link_hash_entry *h,
const Elf_Internal_Sym *isym,
bfd_boolean definition,
bfd_boolean dynamic)
{
if (!dynamic && definition)
h->other = ((h->other & ELF_ST_VISIBILITY (-1))
| (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
}
/* 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 void
elf64_alpha_copy_indirect_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *dir,
struct elf_link_hash_entry *ind)
{
struct alpha_elf_link_hash_entry *hi
= (struct alpha_elf_link_hash_entry *) ind;
struct alpha_elf_link_hash_entry *hs
= (struct alpha_elf_link_hash_entry *) dir;
/* Do the merging in the superclass. */
_bfd_elf_link_hash_copy_indirect(info, dir, ind);
/* Merge the flags. Whee. */
hs->flags |= hi->flags;
/* ??? It's unclear to me what's really supposed to happen when
"merging" defweak and defined symbols, given that we don't
actually throw away the defweak. This more-or-less copies
the logic related to got and plt entries in the superclass. */
if (ind->root.type != bfd_link_hash_indirect)
return;
/* 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->reloc_type == gs->reloc_type
&& gi->addend == gs->addend)
{
gi->use_count += gs->use_count;
goto got_found;
}
gi->next = hs->got_entries;
hs->got_entries = gi;
got_found:;
}
}
hi->got_entries = NULL;
/* And similar for the reloc entries. */
if (hs->reloc_entries == NULL)
hs->reloc_entries = hi->reloc_entries;
else
{
struct alpha_elf_reloc_entry *ri, *rs, *rin, *rsh;
rsh = hs->reloc_entries;
for (ri = hi->reloc_entries; ri ; ri = rin)
{
rin = ri->next;
for (rs = rsh; rs ; rs = rs->next)
if (ri->rtype == rs->rtype && ri->srel == rs->srel)
{
rs->count += ri->count;
goto found_reloc;
}
ri->next = hs->reloc_entries;
hs->reloc_entries = ri;
found_reloc:;
}
}
hi->reloc_entries = NULL;
}
/* Is it possible to merge two object file's .got tables? */
static bfd_boolean
elf64_alpha_can_merge_gots (bfd *a, bfd *b)
{
int total = alpha_elf_tdata (a)->total_got_size;
bfd *bsub;
/* Trivial quick fallout test. */
if (total + alpha_elf_tdata (b)->total_got_size <= MAX_GOT_SIZE)
return TRUE;
/* By their nature, local .got entries cannot be merged. */
if ((total += alpha_elf_tdata (b)->local_got_size) > MAX_GOT_SIZE)
return FALSE;
/* Failing the common trivial comparison, we must effectively
perform the merge. Not actually performing the merge means that
we don't have to store undo information in case we fail. */
for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next)
{
struct alpha_elf_link_hash_entry **hashes = alpha_elf_sym_hashes (bsub);
Elf_Internal_Shdr *symtab_hdr = &elf_tdata (bsub)->symtab_hdr;
int i, n;
n = NUM_SHDR_ENTRIES (symtab_hdr) - symtab_hdr->sh_info;
for (i = 0; i < n; ++i)
{
struct alpha_elf_got_entry *ae, *be;
struct alpha_elf_link_hash_entry *h;
h = hashes[i];
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;
for (be = h->got_entries; be ; be = be->next)
{
if (be->use_count == 0)
continue;
if (be->gotobj != b)
continue;
for (ae = h->got_entries; ae ; ae = ae->next)
if (ae->gotobj == a
&& ae->reloc_type == be->reloc_type
&& ae->addend == be->addend)
goto global_found;
total += alpha_got_entry_size (be->reloc_type);
if (total > MAX_GOT_SIZE)
return FALSE;
global_found:;
}
}
}
return TRUE;
}
/* Actually merge two .got tables. */
static void
elf64_alpha_merge_gots (bfd *a, bfd *b)
{
int total = alpha_elf_tdata (a)->total_got_size;
bfd *bsub;
/* Remember local expansion. */
{
int e = alpha_elf_tdata (b)->local_got_size;
total += e;
alpha_elf_tdata (a)->local_got_size += e;
}
for (bsub = b; bsub ; bsub = alpha_elf_tdata (bsub)->in_got_link_next)
{
struct alpha_elf_got_entry **local_got_entries;
struct alpha_elf_link_hash_entry **hashes;
Elf_Internal_Shdr *symtab_hdr;
int i, n;
/* Let the local .got entries know they are part of a new subsegment. */
local_got_entries = alpha_elf_tdata (bsub)->local_got_entries;
if (local_got_entries)
{
n = elf_tdata (bsub)->symtab_hdr.sh_info;
for (i = 0; i < n; ++i)
{
struct alpha_elf_got_entry *ent;
for (ent = local_got_entries[i]; ent; ent = ent->next)
ent->gotobj = a;
}
}
/* Merge the global .got entries. */
hashes = alpha_elf_sym_hashes (bsub);
symtab_hdr = &elf_tdata (bsub)->symtab_hdr;
n = NUM_SHDR_ENTRIES (symtab_hdr) - symtab_hdr->sh_info;
for (i = 0; i < n; ++i)
{
struct alpha_elf_got_entry *ae, *be, **pbe, **start;
struct alpha_elf_link_hash_entry *h;
h = hashes[i];
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;
pbe = start = &h->got_entries;
while ((be = *pbe) != NULL)
{
if (be->use_count == 0)
{
*pbe = be->next;
memset (be, 0xa5, sizeof (*be));
goto kill;
}
if (be->gotobj != b)
goto next;
for (ae = *start; ae ; ae = ae->next)
if (ae->gotobj == a
&& ae->reloc_type == be->reloc_type
&& ae->addend == be->addend)
{
ae->flags |= be->flags;
ae->use_count += be->use_count;
*pbe = be->next;
memset (be, 0xa5, sizeof (*be));
goto kill;
}
be->gotobj = a;
total += alpha_got_entry_size (be->reloc_type);
next:;
pbe = &be->next;
kill:;
}
}
alpha_elf_tdata (bsub)->gotobj = a;
}
alpha_elf_tdata (a)->total_got_size = total;
/* Merge the two in_got chains. */
{
bfd *next;
bsub = a;
while ((next = alpha_elf_tdata (bsub)->in_got_link_next) != NULL)
bsub = next;
alpha_elf_tdata (bsub)->in_got_link_next = b;
}
}
/* Calculate the offsets for the got entries. */
static bfd_boolean
elf64_alpha_calc_got_offsets_for_symbol (struct alpha_elf_link_hash_entry *h,
void * arg ATTRIBUTE_UNUSED)
{
struct alpha_elf_got_entry *gotent;
for (gotent = h->got_entries; gotent; gotent = gotent->next)
if (gotent->use_count > 0)
{
struct alpha_elf_obj_tdata *td;
bfd_size_type *plge;
td = alpha_elf_tdata (gotent->gotobj);
plge = &td->got->size;
gotent->got_offset = *plge;
*plge += alpha_got_entry_size (gotent->reloc_type);
}
return TRUE;
}
static void
elf64_alpha_calc_got_offsets (struct bfd_link_info *info)
{
bfd *i, *got_list;
struct alpha_elf_link_hash_table * htab;
htab = alpha_elf_hash_table (info);
if (htab == NULL)
return;
got_list = htab->got_list;
/* First, zero out the .got sizes, as we may be recalculating the
.got after optimizing it. */
for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next)
alpha_elf_tdata(i)->got->size = 0;
/* Next, fill in the offsets for all the global entries. */
alpha_elf_link_hash_traverse (htab,
elf64_alpha_calc_got_offsets_for_symbol,
NULL);
/* Finally, fill in the offsets for the local entries. */
for (i = got_list; i ; i = alpha_elf_tdata(i)->got_link_next)
{
bfd_size_type got_offset = alpha_elf_tdata(i)->got->size;
bfd *j;
for (j = i; j ; j = alpha_elf_tdata(j)->in_got_link_next)
{
struct alpha_elf_got_entry **local_got_entries, *gotent;
int k, n;
local_got_entries = alpha_elf_tdata(j)->local_got_entries;
if (!local_got_entries)
continue;
for (k = 0, n = elf_tdata(j)->symtab_hdr.sh_info; k < n; ++k)
for (gotent = local_got_entries[k]; gotent; gotent = gotent->next)
if (gotent->use_count > 0)
{
gotent->got_offset = got_offset;
got_offset += alpha_got_entry_size (gotent->reloc_type);
}
}
alpha_elf_tdata(i)->got->size = got_offset;
}
}
/* Constructs the gots. */
static bfd_boolean
elf64_alpha_size_got_sections (struct bfd_link_info *info,
bfd_boolean may_merge)
{
bfd *i, *got_list, *cur_got_obj = NULL;
struct alpha_elf_link_hash_table * htab;
htab = alpha_elf_hash_table (info);
if (htab == NULL)
return FALSE;
got_list = htab->got_list;
/* On the first time through, pretend we have an existing got list
consisting of all of the input files. */
if (got_list == NULL)
{
for (i = info->input_bfds; i ; i = i->link.next)
{
bfd *this_got;
if (! is_alpha_elf (i))
continue;
this_got = alpha_elf_tdata (i)->gotobj;
if (this_got == NULL)
continue;
/* We are assuming no merging has yet occurred. */
BFD_ASSERT (this_got == i);
if (alpha_elf_tdata (this_got)->total_got_size > MAX_GOT_SIZE)
{
/* Yikes! A single object file has too many entries. */
(*_bfd_error_handler)
(_("%B: .got subsegment exceeds 64K (size %d)"),
i, alpha_elf_tdata (this_got)->total_got_size);
return FALSE;
}
if (got_list == NULL)
got_list = this_got;
else
alpha_elf_tdata(cur_got_obj)->got_link_next = this_got;
cur_got_obj = this_got;
}
/* Strange degenerate case of no got references. */
if (got_list == NULL)
return TRUE;
htab->got_list = got_list;
}
cur_got_obj = got_list;
if (cur_got_obj == NULL)
return FALSE;
if (may_merge)
{
i = alpha_elf_tdata(cur_got_obj)->got_link_next;
while (i != NULL)
{
if (elf64_alpha_can_merge_gots (cur_got_obj, i))
{
elf64_alpha_merge_gots (cur_got_obj, i);
alpha_elf_tdata(i)->got->size = 0;
i = alpha_elf_tdata(i)->got_link_next;
alpha_elf_tdata(cur_got_obj)->got_link_next = i;
}
else
{
cur_got_obj = i;
i = alpha_elf_tdata(i)->got_link_next;
}
}
}
/* Once the gots have been merged, fill in the got offsets for
everything therein. */
elf64_alpha_calc_got_offsets (info);
return TRUE;
}
static bfd_boolean
elf64_alpha_size_plt_section_1 (struct alpha_elf_link_hash_entry *h,
void * data)
{
asection *splt = (asection *) data;
struct alpha_elf_got_entry *gotent;
bfd_boolean saw_one = FALSE;
/* If we didn't need an entry before, we still don't. */
if (!h->root.needs_plt)
return TRUE;
/* For each LITERAL got entry still in use, allocate a plt entry. */
for (gotent = h->got_entries; gotent ; gotent = gotent->next)
if (gotent->reloc_type == R_ALPHA_LITERAL
&& gotent->use_count > 0)
{
if (splt->size == 0)
splt->size = PLT_HEADER_SIZE;
gotent->plt_offset = splt->size;
splt->size += PLT_ENTRY_SIZE;
saw_one = TRUE;
}
/* If there weren't any, there's no longer a need for the PLT entry. */
if (!saw_one)
h->root.needs_plt = FALSE;
return TRUE;
}
/* Called from relax_section to rebuild the PLT in light of potential changes
in the function's status. */
static void
elf64_alpha_size_plt_section (struct bfd_link_info *info)
{
asection *splt, *spltrel, *sgotplt;
unsigned long entries;
bfd *dynobj;
struct alpha_elf_link_hash_table * htab;
htab = alpha_elf_hash_table (info);
if (htab == NULL)
return;
dynobj = elf_hash_table(info)->dynobj;
splt = bfd_get_linker_section (dynobj, ".plt");
if (splt == NULL)
return;
splt->size = 0;
alpha_elf_link_hash_traverse (htab,
elf64_alpha_size_plt_section_1, splt);
/* Every plt entry requires a JMP_SLOT relocation. */
spltrel = bfd_get_linker_section (dynobj, ".rela.plt");
entries = 0;
if (splt->size)
{
if (elf64_alpha_use_secureplt)
entries = (splt->size - NEW_PLT_HEADER_SIZE) / NEW_PLT_ENTRY_SIZE;
else
entries = (splt->size - OLD_PLT_HEADER_SIZE) / OLD_PLT_ENTRY_SIZE;
}
spltrel->size = entries * sizeof (Elf64_External_Rela);
/* When using the secureplt, we need two words somewhere in the data
segment for the dynamic linker to tell us where to go. This is the
entire contents of the .got.plt section. */
if (elf64_alpha_use_secureplt)
{
sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
sgotplt->size = entries ? 16 : 0;
}
}
static bfd_boolean
elf64_alpha_always_size_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info)
{
bfd *i;
struct alpha_elf_link_hash_table * htab;
if (bfd_link_relocatable (info))
return TRUE;
htab = alpha_elf_hash_table (info);
if (htab == NULL)
return FALSE;
if (!elf64_alpha_size_got_sections (info, TRUE))
return FALSE;
/* Allocate space for all of the .got subsections. */
i = htab->got_list;
for ( ; i ; i = alpha_elf_tdata(i)->got_link_next)
{
asection *s = alpha_elf_tdata(i)->got;
if (s->size > 0)
{
s->contents = (bfd_byte *) bfd_zalloc (i, s->size);
if (s->contents == NULL)
return FALSE;
}
}
return TRUE;
}
/* The number of dynamic relocations required by a static relocation. */
static int
alpha_dynamic_entries_for_reloc (int r_type, int dynamic, int shared, int pie)
{
switch (r_type)
{
/* May appear in GOT entries. */
case R_ALPHA_TLSGD:
return (dynamic ? 2 : shared ? 1 : 0);
case R_ALPHA_TLSLDM:
return shared;
case R_ALPHA_LITERAL:
return dynamic || shared;
case R_ALPHA_GOTTPREL:
return dynamic || (shared && !pie);
case R_ALPHA_GOTDTPREL:
return dynamic;
/* May appear in data sections. */
case R_ALPHA_REFLONG:
case R_ALPHA_REFQUAD:
return dynamic || shared;
case R_ALPHA_TPREL64:
return dynamic || (shared && !pie);
/* Everything else is illegal. We'll issue an error during
relocate_section. */
default:
return 0;
}
}
/* Work out the sizes of the dynamic relocation entries. */
static bfd_boolean
elf64_alpha_calc_dynrel_sizes (struct alpha_elf_link_hash_entry *h,
struct bfd_link_info *info)
{
bfd_boolean dynamic;
struct alpha_elf_reloc_entry *relent;
unsigned long entries;
/* If the symbol was defined as a common symbol in a regular object
file, and there was no definition in any dynamic object, then the
linker will have allocated space for the symbol in a common
section but the ELF_LINK_HASH_DEF_REGULAR flag will not have been
set. This is done for dynamic symbols in
elf_adjust_dynamic_symbol but this is not done for non-dynamic
symbols, somehow. */
if (!h->root.def_regular
&& h->root.ref_regular
&& !h->root.def_dynamic
&& (h->root.root.type == bfd_link_hash_defined
|| h->root.root.type == bfd_link_hash_defweak)
&& !(h->root.root.u.def.section->owner->flags & DYNAMIC))
h->root.def_regular = 1;
/* If the symbol is dynamic, we'll need all the relocations in their
natural form. If this is a shared object, and it has been forced
local, we'll need the same number of RELATIVE relocations. */
dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
/* If the symbol is a hidden undefined weak, then we never have any
relocations. Avoid the loop which may want to add RELATIVE relocs
based on bfd_link_pic (info). */
if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
return TRUE;
for (relent = h->reloc_entries; relent; relent = relent->next)
{
entries = alpha_dynamic_entries_for_reloc (relent->rtype, dynamic,
bfd_link_pic (info),
bfd_link_pie (info));
if (entries)
{
relent->srel->size +=
entries * sizeof (Elf64_External_Rela) * relent->count;
if (relent->reltext)
info->flags |= DT_TEXTREL;
}
}
return TRUE;
}
/* Subroutine of elf64_alpha_size_rela_got_section for doing the
global symbols. */
static bfd_boolean
elf64_alpha_size_rela_got_1 (struct alpha_elf_link_hash_entry *h,
struct bfd_link_info *info)
{
bfd_boolean dynamic;
struct alpha_elf_got_entry *gotent;
unsigned long entries;
/* If we're using a plt for this symbol, then all of its relocations
for its got entries go into .rela.plt. */
if (h->root.needs_plt)
return TRUE;
/* If the symbol is dynamic, we'll need all the relocations in their
natural form. If this is a shared object, and it has been forced
local, we'll need the same number of RELATIVE relocations. */
dynamic = alpha_elf_dynamic_symbol_p (&h->root, info);
/* If the symbol is a hidden undefined weak, then we never have any
relocations. Avoid the loop which may want to add RELATIVE relocs
based on bfd_link_pic (info). */
if (h->root.root.type == bfd_link_hash_undefweak && !dynamic)
return TRUE;
entries = 0;
for (gotent = h->got_entries; gotent ; gotent = gotent->next)
if (gotent->use_count > 0)
entries += alpha_dynamic_entries_for_reloc (gotent->reloc_type, dynamic,
bfd_link_pic (info),
bfd_link_pie (info));
if (entries > 0)
{
bfd *dynobj = elf_hash_table(info)->dynobj;
asection *srel = bfd_get_linker_section (dynobj, ".rela.got");
BFD_ASSERT (srel != NULL);
srel->size += sizeof (Elf64_External_Rela) * entries;
}
return TRUE;
}
/* Set the sizes of the dynamic relocation sections. */
static void
elf64_alpha_size_rela_got_section (struct bfd_link_info *info)