/* X86-64 specific support for 64-bit ELF
- Copyright 2000, 2001 Free Software Foundation, Inc.
+ Copyright 2000, 2001, 2002, 2003, 2004, 2005
+ Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
-This file is part of BFD, the Binary File Descriptor library.
+ 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 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.
+ 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. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
+#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/x86-64.h"
-/* We use only the RELA entries. */
-#define USE_RELA
-
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
#define MINUS_ONE (~ (bfd_vma) 0)
/* The relocation "howto" table. Order of fields:
- type, size, bitsize, pc_relative, complain_on_overflow, special_function,
- name, partial_inplace, src_mask, dst_pack, pcrel_offset */
+ type, size, bitsize, pc_relative, complain_on_overflow,
+ special_function, name, partial_inplace, src_mask, dst_pack, pcrel_offset. */
static reloc_howto_type x86_64_elf_howto_table[] =
{
- HOWTO(R_X86_64_NONE, 0,0, 0,false,0,complain_overflow_dont, 0, "R_X86_64_NONE", false,0x00000000,0x00000000,false),
- HOWTO(R_X86_64_64, 0,4,64,false,0,complain_overflow_bitfield,0, "R_X86_64_64", false,MINUS_ONE ,MINUS_ONE ,false),
- HOWTO(R_X86_64_PC32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PC32", false,0xffffffff,0xffffffff,true),
- HOWTO(R_X86_64_GOT32, 0,4,32,false,0,complain_overflow_signed ,0, "R_X86_64_GOT32", false,0xffffffff,0xffffffff,false),
- HOWTO(R_X86_64_PLT32, 0,4,32,true ,0,complain_overflow_signed ,0, "R_X86_64_PLT32", false,0xffffffff,0xffffffff,true),
- HOWTO(R_X86_64_COPY, 0,4,32,false,0,complain_overflow_bitfield,0, "R_X86_64_COPY", false,0xffffffff,0xffffffff,false),
- HOWTO(R_X86_64_GLOB_DAT, 0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_GLOB_DAT",false,MINUS_ONE ,MINUS_ONE ,false),
- HOWTO(R_X86_64_RELATIVE ,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_RELATIVE",false,MINUS_ONE ,MINUS_ONE ,false),
- HOWTO(R_X86_64_JUMP_SLOT,0,4,64,false,0,complain_overflow_bitfield,0,"R_X86_64_JUMP_SLOT",false,MINUS_ONE,MINUS_ONE ,false),
- HOWTO(R_X86_64_GOTPCREL, 0,4,32,true, 0,complain_overflow_signed ,0, "R_X86_64_PCREL", false,0xffffffff,0xffffffff,true),
- HOWTO(R_X86_64_32, 0,4,32,false,0,complain_overflow_unsigned,0, "R_X86_64_32", false,0xffffffff,0xffffffff,false),
- HOWTO(R_X86_64_32S, 0,4,32,false,0,complain_overflow_signed, 0, "R_X86_64_32S", false,0xffffffff,0xffffffff,false),
- HOWTO(R_X86_64_16, 0,1,16,false,0,complain_overflow_bitfield,0, "R_X86_64_16", false,0xffff ,0xffff, false),
- HOWTO(R_X86_64_PC16, 0,1,16,true ,0,complain_overflow_bitfield,0, "R_X86_64_PC16", false,0xffff ,0xffff, true),
- HOWTO(R_X86_64_8, 0,0, 8,false,0,complain_overflow_signed ,0, "R_X86_64_8", false,0xff ,0xff, false),
- HOWTO(R_X86_64_PC8, 0,0, 8,true ,0,complain_overflow_signed ,0, "R_X86_64_PC8", false,0xff ,0xff, true),
+ HOWTO(R_X86_64_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont,
+ bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
+ FALSE),
+ HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
+ FALSE),
+ HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
+ TRUE),
+ HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
+ FALSE),
+ HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
+ TRUE),
+ HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
+ FALSE),
+ HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
+ HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
+ bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
+ FALSE),
+ HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
+ FALSE),
+ HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
+ HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
+ HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
+ HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
+ HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
+ MINUS_ONE, FALSE),
+ HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
+ HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
+ HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
+ 0xffffffff, FALSE),
+ HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
+ HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
+ 0xffffffff, FALSE),
+
+/* GNU extension to record C++ vtable hierarchy. */
+ HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
+ NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
+
+/* GNU extension to record C++ vtable member usage. */
+ HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
+ _bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
+ FALSE)
};
/* Map BFD relocs to the x86_64 elf relocs. */
unsigned char elf_reloc_val;
};
-static CONST struct elf_reloc_map x86_64_reloc_map[] =
+static const struct elf_reloc_map x86_64_reloc_map[] =
{
{ BFD_RELOC_NONE, R_X86_64_NONE, },
{ BFD_RELOC_64, R_X86_64_64, },
{ BFD_RELOC_16_PCREL, R_X86_64_PC16, },
{ BFD_RELOC_8, R_X86_64_8, },
{ BFD_RELOC_8_PCREL, R_X86_64_PC8, },
+ { BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
+ { BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
+ { BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
+ { BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
+ { BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
+ { BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
+ { BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
+ { BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
+ { BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
+ { BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
};
-static reloc_howto_type *elf64_x86_64_reloc_type_lookup
- PARAMS ((bfd *, bfd_reloc_code_real_type));
-static void elf64_x86_64_info_to_howto
- PARAMS ((bfd *, arelent *, Elf64_Internal_Rela *));
-static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
- PARAMS ((bfd *));
-
-static struct bfd_hash_entry *elf64_x86_64_link_hash_newfunc
- PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
-static boolean elf64_x86_64_adjust_dynamic_symbol
- PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
-
-static boolean elf64_x86_64_size_dynamic_sections
- PARAMS ((bfd *, struct bfd_link_info *));
-static boolean elf64_x86_64_relocate_section
- PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
- Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
-static boolean elf64_x86_64_finish_dynamic_symbol
- PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
- Elf_Internal_Sym *sym));
-static boolean elf64_x86_64_finish_dynamic_sections
- PARAMS ((bfd *, struct bfd_link_info *));
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
-elf64_x86_64_reloc_type_lookup (abfd, code)
- bfd *abfd ATTRIBUTE_UNUSED;
- bfd_reloc_code_real_type code;
+elf64_x86_64_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ bfd_reloc_code_real_type code)
{
unsigned int i;
+
for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
i++)
{
if (x86_64_reloc_map[i].bfd_reloc_val == code)
- return &x86_64_elf_howto_table[(int)
- x86_64_reloc_map[i].elf_reloc_val];
+ return &x86_64_elf_howto_table[i];
}
return 0;
}
/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
static void
-elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
- bfd *abfd ATTRIBUTE_UNUSED;
- arelent *cache_ptr;
- Elf64_Internal_Rela *dst;
+elf64_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
+ Elf_Internal_Rela *dst)
{
- unsigned r_type;
+ unsigned r_type, i;
r_type = ELF64_R_TYPE (dst->r_info);
- BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
- cache_ptr->howto = &x86_64_elf_howto_table[r_type];
+ if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT)
+ {
+ BFD_ASSERT (r_type <= (unsigned int) R_X86_64_TPOFF32);
+ i = r_type;
+ }
+ else
+ {
+ BFD_ASSERT (r_type < (unsigned int) R_X86_64_max);
+ i = r_type - ((unsigned int) R_X86_64_GNU_VTINHERIT - R_X86_64_TPOFF32 - 1);
+ }
+ cache_ptr->howto = &x86_64_elf_howto_table[i];
BFD_ASSERT (r_type == cache_ptr->howto->type);
}
\f
-/* Functions for the x86-64 ELF linker. */
+/* Support for core dump NOTE sections. */
+static bfd_boolean
+elf64_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
+{
+ int offset;
+ size_t size;
+
+ switch (note->descsz)
+ {
+ default:
+ return FALSE;
+
+ case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
+ /* pr_cursig */
+ elf_tdata (abfd)->core_signal
+ = bfd_get_16 (abfd, note->descdata + 12);
+
+ /* pr_pid */
+ elf_tdata (abfd)->core_pid
+ = bfd_get_32 (abfd, note->descdata + 32);
+
+ /* pr_reg */
+ offset = 112;
+ size = 216;
+
+ break;
+ }
+
+ /* Make a ".reg/999" section. */
+ return _bfd_elfcore_make_pseudosection (abfd, ".reg",
+ size, note->descpos + offset);
+}
+
+static bfd_boolean
+elf64_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
+{
+ switch (note->descsz)
+ {
+ default:
+ return FALSE;
+
+ case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
+ elf_tdata (abfd)->core_program
+ = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
+ elf_tdata (abfd)->core_command
+ = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
+ }
+
+ /* Note that for some reason, a spurious space is tacked
+ onto the end of the args in some (at least one anyway)
+ implementations, so strip it off if it exists. */
+
+ {
+ char *command = elf_tdata (abfd)->core_command;
+ int n = strlen (command);
+
+ if (0 < n && command[n - 1] == ' ')
+ command[n - 1] = '\0';
+ }
+
+ return TRUE;
+}
+\f
+/* Functions for the x86-64 ELF linker. */
-/* The name of the dynamic interpreter. This is put in the .interp
+/* The name of the dynamic interpreter. This is put in the .interp
section. */
-#define ELF_DYNAMIC_INTERPRETER "/lib/libd64.so.1"
+#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
+
+/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
+ copying dynamic variables from a shared lib into an app's dynbss
+ section, and instead use a dynamic relocation to point into the
+ shared lib. */
+#define ELIMINATE_COPY_RELOCS 1
/* The size in bytes of an entry in the global offset table. */
static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
{
- 0xff, 0xb3, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
- 0xff, 0xa3, 16, 0, 0, 0, /* jmp GOT+16(%rip) */
- 0, 0, 0, 0 /* pad out to 16 bytes. */
+ 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
+ 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
+ 0x90, 0x90, 0x90, 0x90 /* pad out to 16 bytes with nops. */
};
/* Subsequent entries in a procedure linkage table look like this. */
static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] =
{
- 0xff, 0xa3, /* jmp *name@GOTPC(%rip) */
- 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
- 0x68, /* pushq immediate */
+ 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
+ 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
+ 0x68, /* pushq immediate */
0, 0, 0, 0, /* replaced with index into relocation table. */
0xe9, /* jmp relative */
0, 0, 0, 0 /* replaced with offset to start of .plt0. */
};
/* The x86-64 linker needs to keep track of the number of relocs that
- it decides to copy in check_relocs for each symbol. This is so
- that it can discard PC relative relocs if it doesn't need them when
- linking with -Bsymbolic. We store the information in a field
- extending the regular ELF linker hash table. */
-
-/* This structure keeps track of the number of PC relative relocs we
- have copied for a given symbol. */
+ it decides to copy as dynamic relocs in check_relocs for each symbol.
+ This is so that it can later discard them if they are found to be
+ unnecessary. We store the information in a field extending the
+ regular ELF linker hash table. */
-struct elf64_x86_64_pcrel_relocs_copied
+struct elf64_x86_64_dyn_relocs
{
/* Next section. */
- struct elf64_x86_64_pcrel_relocs_copied *next;
- /* A section in dynobj. */
- asection *section;
- /* Number of relocs copied in this section. */
+ struct elf64_x86_64_dyn_relocs *next;
+
+ /* The input section of the reloc. */
+ asection *sec;
+
+ /* Total number of relocs copied for the input section. */
bfd_size_type count;
+
+ /* Number of pc-relative relocs copied for the input section. */
+ bfd_size_type pc_count;
};
/* x86-64 ELF linker hash entry. */
struct elf64_x86_64_link_hash_entry
{
- struct elf_link_hash_entry root;
+ struct elf_link_hash_entry elf;
- /* Number of PC relative relocs copied for this symbol. */
- struct elf64_x86_64_pcrel_relocs_copied *pcrel_relocs_copied;
+ /* Track dynamic relocs copied for this symbol. */
+ struct elf64_x86_64_dyn_relocs *dyn_relocs;
+
+#define GOT_UNKNOWN 0
+#define GOT_NORMAL 1
+#define GOT_TLS_GD 2
+#define GOT_TLS_IE 3
+ unsigned char tls_type;
};
-/* x86-64 ELF linker hash table. */
+#define elf64_x86_64_hash_entry(ent) \
+ ((struct elf64_x86_64_link_hash_entry *)(ent))
-struct elf64_x86_64_link_hash_table {
- struct elf_link_hash_table root;
+struct elf64_x86_64_obj_tdata
+{
+ struct elf_obj_tdata root;
+
+ /* tls_type for each local got entry. */
+ char *local_got_tls_type;
};
-/* Declare this now that the above structures are defined. */
+#define elf64_x86_64_tdata(abfd) \
+ ((struct elf64_x86_64_obj_tdata *) (abfd)->tdata.any)
+
+#define elf64_x86_64_local_got_tls_type(abfd) \
+ (elf64_x86_64_tdata (abfd)->local_got_tls_type)
-static boolean elf64_x86_64_discard_copies
- PARAMS ((struct elf64_x86_64_link_hash_entry *, PTR));
-/* Traverse an x86-64 ELF linker hash table. */
+/* x86-64 ELF linker hash table. */
-#define elf64_x86_64_link_hash_traverse(table, func, info) \
- (elf_link_hash_traverse \
- (&(table)->root, \
- (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
- (info)))
+struct elf64_x86_64_link_hash_table
+{
+ struct elf_link_hash_table elf;
+
+ /* Short-cuts to get to dynamic linker sections. */
+ asection *sgot;
+ asection *sgotplt;
+ asection *srelgot;
+ asection *splt;
+ asection *srelplt;
+ asection *sdynbss;
+ asection *srelbss;
+
+ union {
+ bfd_signed_vma refcount;
+ bfd_vma offset;
+ } tls_ld_got;
+
+ /* Small local sym to section mapping cache. */
+ struct sym_sec_cache sym_sec;
+};
/* Get the x86-64 ELF linker hash table from a link_info structure. */
#define elf64_x86_64_hash_table(p) \
((struct elf64_x86_64_link_hash_table *) ((p)->hash))
-/* Create an entry in an x86-64 ELF linker hash table. */
+/* Create an entry in an x86-64 ELF linker hash table. */
static struct bfd_hash_entry *
-elf64_x86_64_link_hash_newfunc (entry, table, string)
- struct bfd_hash_entry *entry;
- struct bfd_hash_table *table;
- const char *string;
+link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table,
+ const char *string)
{
- struct elf64_x86_64_link_hash_entry *ret =
- (struct elf64_x86_64_link_hash_entry *) entry;
-
/* Allocate the structure if it has not already been allocated by a
subclass. */
- if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
- ret = ((struct elf64_x86_64_link_hash_entry *)
- bfd_hash_allocate (table,
- sizeof (struct elf64_x86_64_link_hash_entry)));
- if (ret == (struct elf64_x86_64_link_hash_entry *) NULL)
- return (struct bfd_hash_entry *) ret;
+ if (entry == NULL)
+ {
+ entry = bfd_hash_allocate (table,
+ sizeof (struct elf64_x86_64_link_hash_entry));
+ if (entry == NULL)
+ return entry;
+ }
/* Call the allocation method of the superclass. */
- ret = ((struct elf64_x86_64_link_hash_entry *)
- _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
- table, string));
- if (ret != (struct elf64_x86_64_link_hash_entry *) NULL)
+ entry = _bfd_elf_link_hash_newfunc (entry, table, string);
+ if (entry != NULL)
{
- ret->pcrel_relocs_copied = NULL;
+ struct elf64_x86_64_link_hash_entry *eh;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) entry;
+ eh->dyn_relocs = NULL;
+ eh->tls_type = GOT_UNKNOWN;
}
- return (struct bfd_hash_entry *) ret;
+ return entry;
}
/* Create an X86-64 ELF linker hash table. */
static struct bfd_link_hash_table *
-elf64_x86_64_link_hash_table_create (abfd)
- bfd *abfd;
+elf64_x86_64_link_hash_table_create (bfd *abfd)
{
struct elf64_x86_64_link_hash_table *ret;
+ bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table);
- ret = ((struct elf64_x86_64_link_hash_table *)
- bfd_alloc (abfd, sizeof (struct elf64_x86_64_link_hash_table)));
- if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
+ ret = (struct elf64_x86_64_link_hash_table *) bfd_malloc (amt);
+ if (ret == NULL)
return NULL;
- if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
- elf64_x86_64_link_hash_newfunc))
+ if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
{
- bfd_release (abfd, ret);
+ free (ret);
return NULL;
}
- return &ret->root.root;
+ ret->sgot = NULL;
+ ret->sgotplt = NULL;
+ ret->srelgot = NULL;
+ ret->splt = NULL;
+ ret->srelplt = NULL;
+ ret->sdynbss = NULL;
+ ret->srelbss = NULL;
+ ret->sym_sec.abfd = NULL;
+ ret->tls_ld_got.refcount = 0;
+
+ return &ret->elf.root;
+}
+
+/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
+ shortcuts to them in our hash table. */
+
+static bfd_boolean
+create_got_section (bfd *dynobj, struct bfd_link_info *info)
+{
+ struct elf64_x86_64_link_hash_table *htab;
+
+ if (! _bfd_elf_create_got_section (dynobj, info))
+ return FALSE;
+
+ htab = elf64_x86_64_hash_table (info);
+ htab->sgot = bfd_get_section_by_name (dynobj, ".got");
+ htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
+ if (!htab->sgot || !htab->sgotplt)
+ abort ();
+
+ htab->srelgot = bfd_make_section (dynobj, ".rela.got");
+ if (htab->srelgot == NULL
+ || ! bfd_set_section_flags (dynobj, htab->srelgot,
+ (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
+ | SEC_IN_MEMORY | SEC_LINKER_CREATED
+ | SEC_READONLY))
+ || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3))
+ return FALSE;
+ return TRUE;
+}
+
+/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
+ .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
+ hash table. */
+
+static bfd_boolean
+elf64_x86_64_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
+{
+ struct elf64_x86_64_link_hash_table *htab;
+
+ htab = elf64_x86_64_hash_table (info);
+ if (!htab->sgot && !create_got_section (dynobj, info))
+ return FALSE;
+
+ if (!_bfd_elf_create_dynamic_sections (dynobj, info))
+ return FALSE;
+
+ htab->splt = bfd_get_section_by_name (dynobj, ".plt");
+ htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt");
+ htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
+ if (!info->shared)
+ htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss");
+
+ if (!htab->splt || !htab->srelplt || !htab->sdynbss
+ || (!info->shared && !htab->srelbss))
+ abort ();
+
+ return TRUE;
+}
+
+/* Copy the extra info we tack onto an elf_link_hash_entry. */
+
+static void
+elf64_x86_64_copy_indirect_symbol (const struct elf_backend_data *bed,
+ struct elf_link_hash_entry *dir,
+ struct elf_link_hash_entry *ind)
+{
+ struct elf64_x86_64_link_hash_entry *edir, *eind;
+
+ edir = (struct elf64_x86_64_link_hash_entry *) dir;
+ eind = (struct elf64_x86_64_link_hash_entry *) ind;
+
+ if (eind->dyn_relocs != NULL)
+ {
+ if (edir->dyn_relocs != NULL)
+ {
+ struct elf64_x86_64_dyn_relocs **pp;
+ struct elf64_x86_64_dyn_relocs *p;
+
+ if (ind->root.type == bfd_link_hash_indirect)
+ abort ();
+
+ /* Add reloc counts against the weak sym to the strong sym
+ list. Merge any entries against the same section. */
+ for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
+ {
+ struct elf64_x86_64_dyn_relocs *q;
+
+ for (q = edir->dyn_relocs; q != NULL; q = q->next)
+ if (q->sec == p->sec)
+ {
+ q->pc_count += p->pc_count;
+ q->count += p->count;
+ *pp = p->next;
+ break;
+ }
+ if (q == NULL)
+ pp = &p->next;
+ }
+ *pp = edir->dyn_relocs;
+ }
+
+ edir->dyn_relocs = eind->dyn_relocs;
+ eind->dyn_relocs = NULL;
+ }
+
+ if (ind->root.type == bfd_link_hash_indirect
+ && dir->got.refcount <= 0)
+ {
+ edir->tls_type = eind->tls_type;
+ eind->tls_type = GOT_UNKNOWN;
+ }
+
+ if (ELIMINATE_COPY_RELOCS
+ && ind->root.type != bfd_link_hash_indirect
+ && dir->dynamic_adjusted)
+ {
+ /* If called to transfer flags for a weakdef during processing
+ of elf_adjust_dynamic_symbol, don't copy non_got_ref.
+ We clear it ourselves for ELIMINATE_COPY_RELOCS. */
+ dir->ref_dynamic |= ind->ref_dynamic;
+ dir->ref_regular |= ind->ref_regular;
+ dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
+ dir->needs_plt |= ind->needs_plt;
+ dir->pointer_equality_needed |= ind->pointer_equality_needed;
+ }
+ else
+ _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
}
-boolean
-elf64_x86_64_elf_object_p (abfd)
- bfd *abfd;
+static bfd_boolean
+elf64_x86_64_mkobject (bfd *abfd)
+{
+ bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
+ abfd->tdata.any = bfd_zalloc (abfd, amt);
+ if (abfd->tdata.any == NULL)
+ return FALSE;
+ return TRUE;
+}
+
+static bfd_boolean
+elf64_x86_64_elf_object_p (bfd *abfd)
{
/* Set the right machine number for an x86-64 elf64 file. */
bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
- return true;
+ return TRUE;
+}
+
+static int
+elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
+{
+ if (info->shared)
+ return r_type;
+
+ switch (r_type)
+ {
+ case R_X86_64_TLSGD:
+ case R_X86_64_GOTTPOFF:
+ if (is_local)
+ return R_X86_64_TPOFF32;
+ return R_X86_64_GOTTPOFF;
+ case R_X86_64_TLSLD:
+ return R_X86_64_TPOFF32;
+ }
+
+ return r_type;
}
/* Look through the relocs for a section during the first phase, and
- allocate space in the global offset table or procedure linkage
- table. */
-
-static boolean
-elf64_x86_64_check_relocs (abfd, info, sec, relocs)
- bfd *abfd;
- struct bfd_link_info *info;
- asection *sec;
- const Elf_Internal_Rela *relocs;
+ calculate needed space in the global offset table, procedure
+ linkage table, and dynamic reloc sections. */
+
+static bfd_boolean
+elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
+ const Elf_Internal_Rela *relocs)
{
- bfd *dynobj;
+ struct elf64_x86_64_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
- bfd_signed_vma *local_got_refcounts;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
- asection *sgot;
- asection *srelgot;
asection *sreloc;
- if (info->relocateable)
- return true;
+ if (info->relocatable)
+ return TRUE;
- dynobj = elf_hash_table (info)->dynobj;
+ htab = elf64_x86_64_hash_table (info);
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
- local_got_refcounts = elf_local_got_refcounts (abfd);
- sgot = srelgot = sreloc = NULL;
+ sreloc = NULL;
+
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
+ unsigned int r_type;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
r_symndx = ELF64_R_SYM (rel->r_info);
+ r_type = ELF64_R_TYPE (rel->r_info);
+
+ if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
+ {
+ (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
+ abfd, r_symndx);
+ return FALSE;
+ }
+
if (r_symndx < symtab_hdr->sh_info)
h = NULL;
else
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- /* Some relocs require a global offset table. */
- if (dynobj == NULL)
- {
- switch (ELF64_R_TYPE (rel->r_info))
- {
- case R_X86_64_GOT32:
- case R_X86_64_GOTPCREL:
- elf_hash_table (info)->dynobj = dynobj = abfd;
- if (! _bfd_elf_create_got_section (dynobj, info))
- return false;
- break;
- }
- }
-
- switch (ELF64_R_TYPE (rel->r_info))
+ r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
+ switch (r_type)
{
- case R_X86_64_GOT32:
- /* This symbol requires a global offset table entry. */
+ case R_X86_64_TLSLD:
+ htab->tls_ld_got.refcount += 1;
+ goto create_got;
- if (sgot == NULL)
+ case R_X86_64_TPOFF32:
+ if (info->shared)
{
- sgot = bfd_get_section_by_name (dynobj, ".got");
- BFD_ASSERT (sgot != NULL);
+ (*_bfd_error_handler)
+ (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
+ abfd,
+ x86_64_elf_howto_table[r_type].name,
+ (h) ? h->root.root.string : "a local symbol");
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
}
+ break;
- if (srelgot == NULL && (h != NULL || info->shared))
- {
- srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
- if (srelgot == NULL)
- {
- srelgot = bfd_make_section (dynobj, ".rela.got");
- if (srelgot == NULL
- || ! bfd_set_section_flags (dynobj, srelgot,
- (SEC_ALLOC
- | SEC_LOAD
- | SEC_HAS_CONTENTS
- | SEC_IN_MEMORY
- | SEC_LINKER_CREATED
- | SEC_READONLY))
- || ! bfd_set_section_alignment (dynobj, srelgot, 2))
- return false;
- }
- }
+ case R_X86_64_GOTTPOFF:
+ if (info->shared)
+ info->flags |= DF_STATIC_TLS;
+ /* Fall through */
- if (h != NULL)
- {
- if (h->got.refcount == -1)
- {
- h->got.refcount = 1;
+ case R_X86_64_GOT32:
+ case R_X86_64_GOTPCREL:
+ case R_X86_64_TLSGD:
+ /* This symbol requires a global offset table entry. */
+ {
+ int tls_type, old_tls_type;
- /* Make sure this symbol is output as a dynamic symbol. */
- if (h->dynindx == -1)
- {
- if (! bfd_elf64_link_record_dynamic_symbol (info, h))
- return false;
- }
+ switch (r_type)
+ {
+ default: tls_type = GOT_NORMAL; break;
+ case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
+ case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
+ }
- sgot->_raw_size += GOT_ENTRY_SIZE;
- srelgot->_raw_size += sizeof (Elf64_External_Rela);
- }
- else
+ if (h != NULL)
+ {
h->got.refcount += 1;
- }
- else
- {
- /* This is a global offset table entry for a local symbol. */
- if (local_got_refcounts == NULL)
- {
- size_t size;
-
- size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
- local_got_refcounts = ((bfd_signed_vma *)
- bfd_alloc (abfd, size));
- if (local_got_refcounts == NULL)
- return false;
- elf_local_got_refcounts (abfd) = local_got_refcounts;
- memset (local_got_refcounts, -1, size);
- }
- if (local_got_refcounts[r_symndx] == -1)
- {
- local_got_refcounts[r_symndx] = 1;
+ old_tls_type = elf64_x86_64_hash_entry (h)->tls_type;
+ }
+ else
+ {
+ bfd_signed_vma *local_got_refcounts;
- sgot->_raw_size += GOT_ENTRY_SIZE;
- if (info->shared)
- {
- /* If we are generating a shared object, we need to
- output a R_X86_64_RELATIVE reloc so that the dynamic
- linker can adjust this GOT entry. */
- srelgot->_raw_size += sizeof (Elf64_External_Rela);
- }
- }
- else
+ /* This is a global offset table entry for a local symbol. */
+ local_got_refcounts = elf_local_got_refcounts (abfd);
+ if (local_got_refcounts == NULL)
+ {
+ bfd_size_type size;
+
+ size = symtab_hdr->sh_info;
+ size *= sizeof (bfd_signed_vma) + sizeof (char);
+ local_got_refcounts = ((bfd_signed_vma *)
+ bfd_zalloc (abfd, size));
+ if (local_got_refcounts == NULL)
+ return FALSE;
+ elf_local_got_refcounts (abfd) = local_got_refcounts;
+ elf64_x86_64_local_got_tls_type (abfd)
+ = (char *) (local_got_refcounts + symtab_hdr->sh_info);
+ }
local_got_refcounts[r_symndx] += 1;
+ old_tls_type
+ = elf64_x86_64_local_got_tls_type (abfd) [r_symndx];
+ }
+
+ /* If a TLS symbol is accessed using IE at least once,
+ there is no point to use dynamic model for it. */
+ if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
+ && (old_tls_type != GOT_TLS_GD || tls_type != GOT_TLS_IE))
+ {
+ if (old_tls_type == GOT_TLS_IE && tls_type == GOT_TLS_GD)
+ tls_type = old_tls_type;
+ else
+ {
+ (*_bfd_error_handler)
+ (_("%B: %s' accessed both as normal and thread local symbol"),
+ abfd, h ? h->root.root.string : "<local>");
+ return FALSE;
+ }
+ }
+
+ if (old_tls_type != tls_type)
+ {
+ if (h != NULL)
+ elf64_x86_64_hash_entry (h)->tls_type = tls_type;
+ else
+ elf64_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
+ }
+ }
+ /* Fall through */
+
+ //case R_X86_64_GOTPCREL:
+ create_got:
+ if (htab->sgot == NULL)
+ {
+ if (htab->elf.dynobj == NULL)
+ htab->elf.dynobj = abfd;
+ if (!create_got_section (htab->elf.dynobj, info))
+ return FALSE;
}
break;
case R_X86_64_PLT32:
/* This symbol requires a procedure linkage table entry. We
- actually build the entry in adjust_dynamic_symbol,
- because this might be a case of linking PIC code which is
- never referenced by a dynamic object, in which case we
- don't need to generate a procedure linkage table entry
- after all. */
+ actually build the entry in adjust_dynamic_symbol,
+ because this might be a case of linking PIC code which is
+ never referenced by a dynamic object, in which case we
+ don't need to generate a procedure linkage table entry
+ after all. */
/* If this is a local symbol, we resolve it directly without
- creating a procedure linkage table entry. */
+ creating a procedure linkage table entry. */
if (h == NULL)
continue;
- if (h->plt.refcount == -1)
- {
- h->plt.refcount = 1;
- h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
- }
- else
- h->plt.refcount += 1;
+ h->needs_plt = 1;
+ h->plt.refcount += 1;
break;
+ case R_X86_64_8:
+ case R_X86_64_16:
case R_X86_64_32:
case R_X86_64_32S:
+ /* Let's help debug shared library creation. These relocs
+ cannot be used in shared libs. Don't error out for
+ sections we don't care about, such as debug sections or
+ non-constant sections. */
+ if (info->shared
+ && (sec->flags & SEC_ALLOC) != 0
+ && (sec->flags & SEC_READONLY) != 0)
+ {
+ (*_bfd_error_handler)
+ (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
+ abfd,
+ x86_64_elf_howto_table[r_type].name,
+ (h) ? h->root.root.string : "a local symbol");
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+ /* Fall through. */
+
+ case R_X86_64_PC8:
+ case R_X86_64_PC16:
case R_X86_64_PC32:
- if (h != NULL)
- h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
+ case R_X86_64_64:
+ if (h != NULL && !info->shared)
+ {
+ /* If this reloc is in a read-only section, we might
+ need a copy reloc. We can't check reliably at this
+ stage whether the section is read-only, as input
+ sections have not yet been mapped to output sections.
+ Tentatively set the flag for now, and correct in
+ adjust_dynamic_symbol. */
+ h->non_got_ref = 1;
+
+ /* We may need a .plt entry if the function this reloc
+ refers to is in a shared lib. */
+ h->plt.refcount += 1;
+ if (r_type != R_X86_64_PC32)
+ h->pointer_equality_needed = 1;
+ }
/* If we are creating a shared library, and this is a reloc
against a global symbol, or a non PC relative reloc
into the shared library. However, if we are linking with
-Bsymbolic, we do not need to copy a reloc against a
global symbol which is defined in an object we are
- including in the link (i.e., DEF_REGULAR is set). At
+ including in the link (i.e., DEF_REGULAR is set). At
this point we have not seen all the input files, so it is
possible that DEF_REGULAR is not set now but will be set
- later (it is never cleared). We account for that
- possibility below by storing information in the
- pcrel_relocs_copied field of the hash table entry.
- A similar situation occurs when creating shared libraries
- and symbol visibility changes render the symbol local. */
- if (info->shared
- && (sec->flags & SEC_ALLOC) != 0
- && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32
- || (h != NULL
- && (! info->symbolic
- || (h->elf_link_hash_flags
- & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+ later (it is never cleared). In case of a weak definition,
+ DEF_REGULAR may be cleared later by a strong definition in
+ a shared library. We account for that possibility below by
+ storing information in the relocs_copied field of the hash
+ table entry. A similar situation occurs when creating
+ shared libraries and symbol visibility changes render the
+ symbol local.
+
+ If on the other hand, we are creating an executable, we
+ may need to keep relocations for symbols satisfied by a
+ dynamic library if we manage to avoid copy relocs for the
+ symbol. */
+ if ((info->shared
+ && (sec->flags & SEC_ALLOC) != 0
+ && (((r_type != R_X86_64_PC8)
+ && (r_type != R_X86_64_PC16)
+ && (r_type != R_X86_64_PC32))
+ || (h != NULL
+ && (! info->symbolic
+ || h->root.type == bfd_link_hash_defweak
+ || !h->def_regular))))
+ || (ELIMINATE_COPY_RELOCS
+ && !info->shared
+ && (sec->flags & SEC_ALLOC) != 0
+ && h != NULL
+ && (h->root.type == bfd_link_hash_defweak
+ || !h->def_regular)))
{
- /* When creating a shared object, we must copy these
- reloc types into the output file. We create a reloc
- section in dynobj and make room for this reloc. */
+ struct elf64_x86_64_dyn_relocs *p;
+ struct elf64_x86_64_dyn_relocs **head;
+
+ /* We must copy these reloc types into the output file.
+ Create a reloc section in dynobj and make room for
+ this reloc. */
if (sreloc == NULL)
{
const char *name;
+ bfd *dynobj;
name = (bfd_elf_string_from_elf_section
(abfd,
elf_elfheader (abfd)->e_shstrndx,
elf_section_data (sec)->rel_hdr.sh_name));
if (name == NULL)
- return false;
+ return FALSE;
- BFD_ASSERT (strncmp (name, ".rela", 5) == 0
- && strcmp (bfd_get_section_name (abfd, sec),
- name + 5) == 0);
+ if (strncmp (name, ".rela", 5) != 0
+ || strcmp (bfd_get_section_name (abfd, sec),
+ name + 5) != 0)
+ {
+ (*_bfd_error_handler)
+ (_("%B: bad relocation section name `%s\'"),
+ abfd, name);
+ }
+
+ if (htab->elf.dynobj == NULL)
+ htab->elf.dynobj = abfd;
+
+ dynobj = htab->elf.dynobj;
sreloc = bfd_get_section_by_name (dynobj, name);
if (sreloc == NULL)
flags |= SEC_ALLOC | SEC_LOAD;
if (sreloc == NULL
|| ! bfd_set_section_flags (dynobj, sreloc, flags)
- || ! bfd_set_section_alignment (dynobj, sreloc, 2))
- return false;
+ || ! bfd_set_section_alignment (dynobj, sreloc, 3))
+ return FALSE;
}
+ elf_section_data (sec)->sreloc = sreloc;
}
- sreloc->_raw_size += sizeof (Elf64_External_Rela);
+ /* If this is a global symbol, we count the number of
+ relocations we need for this symbol. */
+ if (h != NULL)
+ {
+ head = &((struct elf64_x86_64_link_hash_entry *) h)->dyn_relocs;
+ }
+ else
+ {
+ /* Track dynamic relocs needed for local syms too.
+ We really need local syms available to do this
+ easily. Oh well. */
+
+ asection *s;
+ s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
+ sec, r_symndx);
+ if (s == NULL)
+ return FALSE;
+
+ head = ((struct elf64_x86_64_dyn_relocs **)
+ &elf_section_data (s)->local_dynrel);
+ }
- /* If this is a global symbol, we count the number of PC
- relative relocations we have entered for this symbol,
- so that we can discard them later as necessary. Note
- that this function is only called if we are using an
- elf64_x86_64 linker hash table, which means that h is
- really a pointer to an elf64_x86_64_link_hash_entry. */
- if (h != NULL
- && ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
+ p = *head;
+ if (p == NULL || p->sec != sec)
{
- struct elf64_x86_64_link_hash_entry *eh;
- struct elf64_x86_64_pcrel_relocs_copied *p;
+ bfd_size_type amt = sizeof *p;
+ p = ((struct elf64_x86_64_dyn_relocs *)
+ bfd_alloc (htab->elf.dynobj, amt));
+ if (p == NULL)
+ return FALSE;
+ p->next = *head;
+ *head = p;
+ p->sec = sec;
+ p->count = 0;
+ p->pc_count = 0;
+ }
- eh = (struct elf64_x86_64_link_hash_entry *) h;
+ p->count += 1;
+ if (r_type == R_X86_64_PC8
+ || r_type == R_X86_64_PC16
+ || r_type == R_X86_64_PC32)
+ p->pc_count += 1;
+ }
+ break;
- for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
- if (p->section == sreloc)
- break;
+ /* This relocation describes the C++ object vtable hierarchy.
+ Reconstruct it for later use during GC. */
+ case R_X86_64_GNU_VTINHERIT:
+ if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
+ return FALSE;
+ break;
- if (p == NULL)
- {
- p = ((struct elf64_x86_64_pcrel_relocs_copied *)
- bfd_alloc (dynobj, sizeof *p));
- if (p == NULL)
- return false;
- p->next = eh->pcrel_relocs_copied;
- eh->pcrel_relocs_copied = p;
- p->section = sreloc;
- p->count = 0;
- }
+ /* This relocation describes which C++ vtable entries are actually
+ used. Record for later use during GC. */
+ case R_X86_64_GNU_VTENTRY:
+ if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return FALSE;
+ break;
- ++p->count;
- }
- }
+ default:
break;
}
}
- return true;
+ return TRUE;
}
/* Return the section that should be marked against GC for a given
- relocation. */
+ relocation. */
static asection *
-elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym)
- bfd *abfd;
- struct bfd_link_info *info ATTRIBUTE_UNUSED;
- Elf_Internal_Rela *rel ATTRIBUTE_UNUSED;
- struct elf_link_hash_entry *h;
- Elf_Internal_Sym *sym;
+elf64_x86_64_gc_mark_hook (asection *sec,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ Elf_Internal_Rela *rel,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym)
{
if (h != NULL)
{
- switch (h->root.type)
+ switch (ELF64_R_TYPE (rel->r_info))
{
- case bfd_link_hash_defined:
- case bfd_link_hash_defweak:
- return h->root.u.def.section;
-
- case bfd_link_hash_common:
- return h->root.u.c.p->section;
+ case R_X86_64_GNU_VTINHERIT:
+ case R_X86_64_GNU_VTENTRY:
+ break;
default:
- break;
+ switch (h->root.type)
+ {
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
+ default:
+ break;
+ }
}
}
else
- {
- if (!(elf_bad_symtab (abfd)
- && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
- && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
- && sym->st_shndx != SHN_COMMON))
- {
- return bfd_section_from_elf_index (abfd, sym->st_shndx);
- }
- }
+ return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
return NULL;
}
-/* Update the got entry reference counts for the section being removed. */
+/* Update the got entry reference counts for the section being removed. */
-static boolean
-elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs)
- bfd *abfd;
- struct bfd_link_info *info ATTRIBUTE_UNUSED;
- asection *sec;
- const Elf_Internal_Rela *relocs;
+static bfd_boolean
+elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
+ asection *sec, const Elf_Internal_Rela *relocs)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
bfd_signed_vma *local_got_refcounts;
const Elf_Internal_Rela *rel, *relend;
- unsigned long r_symndx;
- struct elf_link_hash_entry *h;
- bfd *dynobj;
- asection *sgot;
- asection *srelgot;
+
+ elf_section_data (sec)->local_dynrel = NULL;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
local_got_refcounts = elf_local_got_refcounts (abfd);
- dynobj = elf_hash_table (info)->dynobj;
- if (dynobj == NULL)
- return true;
-
- sgot = bfd_get_section_by_name (dynobj, ".got");
- srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
-
relend = relocs + sec->reloc_count;
for (rel = relocs; rel < relend; rel++)
- switch (ELF64_R_TYPE (rel->r_info))
- {
- case R_X86_64_GOT32:
- case R_X86_64_GOTPCREL:
- r_symndx = ELF64_R_SYM (rel->r_info);
- if (r_symndx >= symtab_hdr->sh_info)
- {
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- if (h->got.refcount > 0)
+ {
+ unsigned long r_symndx;
+ unsigned int r_type;
+ struct elf_link_hash_entry *h = NULL;
+
+ r_symndx = ELF64_R_SYM (rel->r_info);
+ if (r_symndx >= symtab_hdr->sh_info)
+ {
+ struct elf64_x86_64_link_hash_entry *eh;
+ struct elf64_x86_64_dyn_relocs **pp;
+ struct elf64_x86_64_dyn_relocs *p;
+
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+
+ for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
+ if (p->sec == sec)
{
- h->got.refcount -= 1;
- if (h->got.refcount == 0)
- {
- sgot->_raw_size -= GOT_ENTRY_SIZE;
- srelgot->_raw_size -= sizeof (Elf64_External_Rela);
- }
+ /* Everything must go for SEC. */
+ *pp = p->next;
+ break;
}
- }
- else if (local_got_refcounts != NULL)
- {
- if (local_got_refcounts[r_symndx] > 0)
- {
+ }
+
+ r_type = ELF64_R_TYPE (rel->r_info);
+ r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL);
+ switch (r_type)
+ {
+ case R_X86_64_TLSLD:
+ if (elf64_x86_64_hash_table (info)->tls_ld_got.refcount > 0)
+ elf64_x86_64_hash_table (info)->tls_ld_got.refcount -= 1;
+ break;
+
+ case R_X86_64_TLSGD:
+ case R_X86_64_GOTTPOFF:
+ case R_X86_64_GOT32:
+ case R_X86_64_GOTPCREL:
+ if (h != NULL)
+ {
+ if (h->got.refcount > 0)
+ h->got.refcount -= 1;
+ }
+ else if (local_got_refcounts != NULL)
+ {
+ if (local_got_refcounts[r_symndx] > 0)
local_got_refcounts[r_symndx] -= 1;
- if (local_got_refcounts[r_symndx] == 0)
- {
- sgot->_raw_size -= GOT_ENTRY_SIZE;
- if (info->shared)
- srelgot->_raw_size -= sizeof (Elf64_External_Rela);
- }
- }
- }
- break;
+ }
+ break;
- case R_X86_64_PLT32:
- r_symndx = ELF64_R_SYM (rel->r_info);
- if (r_symndx >= symtab_hdr->sh_info)
- {
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- if (h->plt.refcount > 0)
- h->plt.refcount -= 1;
- }
- break;
+ case R_X86_64_8:
+ case R_X86_64_16:
+ case R_X86_64_32:
+ case R_X86_64_64:
+ case R_X86_64_32S:
+ case R_X86_64_PC8:
+ case R_X86_64_PC16:
+ case R_X86_64_PC32:
+ if (info->shared)
+ break;
+ /* Fall thru */
- default:
- break;
- }
+ case R_X86_64_PLT32:
+ if (h != NULL)
+ {
+ if (h->plt.refcount > 0)
+ h->plt.refcount -= 1;
+ }
+ break;
- return true;
+ 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. */
+ understand. */
-static boolean
-elf64_x86_64_adjust_dynamic_symbol (info, h)
- struct bfd_link_info *info;
- struct elf_link_hash_entry *h;
+static bfd_boolean
+elf64_x86_64_adjust_dynamic_symbol (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h)
{
- bfd *dynobj;
+ struct elf64_x86_64_link_hash_table *htab;
asection *s;
unsigned int power_of_two;
- dynobj = elf_hash_table (info)->dynobj;
-
- /* Make sure we know what is going on here. */
- BFD_ASSERT (dynobj != NULL
- && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
- || h->weakdef != NULL
- || ((h->elf_link_hash_flags
- & ELF_LINK_HASH_DEF_DYNAMIC) != 0
- && (h->elf_link_hash_flags
- & ELF_LINK_HASH_REF_REGULAR) != 0
- && (h->elf_link_hash_flags
- & ELF_LINK_HASH_DEF_REGULAR) == 0)));
-
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later,
when we know the address of the .got section. */
if (h->type == STT_FUNC
- || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
+ || h->needs_plt)
{
- if (! elf_hash_table (info)->dynamic_sections_created)
+ if (h->plt.refcount <= 0
+ || SYMBOL_CALLS_LOCAL (info, h)
+ || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+ && h->root.type == bfd_link_hash_undefweak))
{
- /* FIXME: These are the sparc64 comment and then the i386 comment.
- How we need to deal with this and why remains to be seen. */
- /* This case can occur if we saw a WPLT30 reloc in an input
- file, but none of the input files were dynamic objects.
- In such a case, we don't actually need to build a
- procedure linkage table, and we can just do a WDISP30
- reloc instead. */
/* This case can occur if we saw a PLT32 reloc in an input
file, but the symbol was never referred to by a dynamic
object, or if all references were garbage collected. In
such a case, we don't actually need to build a procedure
linkage table, and we can just do a PC32 reloc instead. */
- /* i386 code: */
h->plt.offset = (bfd_vma) -1;
- h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
- return true;
+ h->needs_plt = 0;
}
- /* Make sure this symbol is output as a dynamic symbol. */
- if (h->dynindx == -1)
- {
- if (! bfd_elf64_link_record_dynamic_symbol (info, h))
- return false;
- }
-
- s = bfd_get_section_by_name (dynobj, ".plt");
- BFD_ASSERT (s != NULL);
-
- /* If this is the first .plt entry, make room for the special
- first entry. */
- if (s->_raw_size == 0)
- s->_raw_size = PLT_ENTRY_SIZE;
-
- /* If this symbol is not defined in a regular file, and we are
- not generating a shared library, then set the symbol to this
- location in the .plt. This is required to make function
- pointers compare as equal between the normal executable and
- the shared library. */
- if (! info->shared
- && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
- {
- h->root.u.def.section = s;
- h->root.u.def.value = s->_raw_size;
- }
-
- h->plt.offset = s->_raw_size;
-
- /* Make room for this entry. */
- s->_raw_size += PLT_ENTRY_SIZE;
-
- /* We also need to make an entry in the .rela.plt section. */
- s = bfd_get_section_by_name (dynobj, ".rela.plt");
- BFD_ASSERT (s != NULL);
- s->_raw_size += sizeof (Elf64_External_Rela);
-
- return true;
+ return TRUE;
}
+ else
+ /* It's possible that we incorrectly decided a .plt reloc was
+ needed for an R_X86_64_PC32 reloc to a non-function sym in
+ check_relocs. We can't decide accurately between function and
+ non-function syms in check-relocs; Objects loaded later in
+ the link may change h->type. So fix it now. */
+ h->plt.offset = (bfd_vma) -1;
/* 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)
+ real definition first, and we can just use the same value. */
+ if (h->u.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;
+ 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;
+ if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
+ h->non_got_ref = h->u.weakdef->non_got_ref;
+ return TRUE;
}
/* This is a reference to a symbol defined by a dynamic object which
- is not a function. */
+ is not a function. */
/* If we are creating a shared library, we must presume that the
only references to the symbol are via the global offset table.
For such cases we need not do anything here; the relocations will
- be handled correctly by relocate_section. */
+ be handled correctly by relocate_section. */
if (info->shared)
- return true;
+ return TRUE;
/* If there are no references to this symbol that do not use the
GOT, we don't need to generate a copy reloc. */
- if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
- return true;
+ if (!h->non_got_ref)
+ return TRUE;
+
+ /* If -z nocopyreloc was given, we won't generate them either. */
+ if (info->nocopyreloc)
+ {
+ h->non_got_ref = 0;
+ return TRUE;
+ }
+
+ if (ELIMINATE_COPY_RELOCS)
+ {
+ struct elf64_x86_64_link_hash_entry * eh;
+ struct elf64_x86_64_dyn_relocs *p;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+ for (p = eh->dyn_relocs; p != NULL; p = p->next)
+ {
+ s = p->sec->output_section;
+ if (s != NULL && (s->flags & SEC_READONLY) != 0)
+ break;
+ }
+
+ /* If we didn't find any dynamic relocs in read-only sections, then
+ we'll be keeping the dynamic relocs and avoiding the copy reloc. */
+ if (p == NULL)
+ {
+ h->non_got_ref = 0;
+ return TRUE;
+ }
+ }
/* We must allocate the symbol in our .dynbss section, which will
- become part of the .bss section of the executable. There will be
+ become part of the .bss section of the executable. There will be
an entry for this symbol in the .dynsym section. The dynamic
object will contain position independent code, so all references
from the dynamic object to this symbol will go through the global
both the dynamic object and the regular object will refer to the
same memory location for the variable. */
- s = bfd_get_section_by_name (dynobj, ".dynbss");
- BFD_ASSERT (s != NULL);
+ htab = elf64_x86_64_hash_table (info);
/* We must generate a R_X86_64_COPY reloc to tell the dynamic linker
to copy the initial value out of the dynamic object and into the
- runtime process image. We need to remember the offset into the
- .rela.bss section we are going to use. */
+ runtime process image. */
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
{
- asection *srel;
-
- srel = bfd_get_section_by_name (dynobj, ".rela.bss");
- BFD_ASSERT (srel != NULL);
- srel->_raw_size += sizeof (Elf64_External_Rela);
- h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
+ htab->srelbss->size += sizeof (Elf64_External_Rela);
+ h->needs_copy = 1;
}
/* We need to figure out the alignment required for this symbol. I
- have no idea how ELF linkers handle this. 16-bytes is the size
+ have no idea how ELF linkers handle this. 16-bytes is the size
of the largest type that requires hard alignment -- long double. */
/* FIXME: This is VERY ugly. Should be fixed for all architectures using
this construct. */
power_of_two = 4;
/* Apply the required alignment. */
- s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
- if (power_of_two > bfd_get_section_alignment (dynobj, s))
+ s = htab->sdynbss;
+ s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
+ if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
{
- if (! bfd_set_section_alignment (dynobj, s, power_of_two))
- return false;
+ if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
+ return FALSE;
}
/* Define the symbol as being at this point in the section. */
h->root.u.def.section = s;
- h->root.u.def.value = s->_raw_size;
+ h->root.u.def.value = s->size;
/* Increment the section size to make room for the symbol. */
- s->_raw_size += h->size;
+ s->size += h->size;
+
+ return TRUE;
+}
- return true;
+/* Allocate space in .plt, .got and associated reloc sections for
+ dynamic relocs. */
+
+static bfd_boolean
+allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
+{
+ struct bfd_link_info *info;
+ struct elf64_x86_64_link_hash_table *htab;
+ struct elf64_x86_64_link_hash_entry *eh;
+ struct elf64_x86_64_dyn_relocs *p;
+
+ if (h->root.type == bfd_link_hash_indirect)
+ return TRUE;
+
+ if (h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ info = (struct bfd_link_info *) inf;
+ htab = elf64_x86_64_hash_table (info);
+
+ if (htab->elf.dynamic_sections_created
+ && h->plt.refcount > 0)
+ {
+ /* Make sure this symbol is output as a dynamic symbol.
+ Undefined weak syms won't yet be marked as dynamic. */
+ if (h->dynindx == -1
+ && !h->forced_local)
+ {
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ if (info->shared
+ || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
+ {
+ asection *s = htab->splt;
+
+ /* If this is the first .plt entry, make room for the special
+ first entry. */
+ if (s->size == 0)
+ s->size += PLT_ENTRY_SIZE;
+
+ h->plt.offset = s->size;
+
+ /* If this symbol is not defined in a regular file, and we are
+ not generating a shared library, then set the symbol to this
+ location in the .plt. This is required to make function
+ pointers compare as equal between the normal executable and
+ the shared library. */
+ if (! info->shared
+ && !h->def_regular)
+ {
+ h->root.u.def.section = s;
+ h->root.u.def.value = h->plt.offset;
+ }
+
+ /* Make room for this entry. */
+ s->size += PLT_ENTRY_SIZE;
+
+ /* We also need to make an entry in the .got.plt section, which
+ will be placed in the .got section by the linker script. */
+ htab->sgotplt->size += GOT_ENTRY_SIZE;
+
+ /* We also need to make an entry in the .rela.plt section. */
+ htab->srelplt->size += sizeof (Elf64_External_Rela);
+ }
+ else
+ {
+ h->plt.offset = (bfd_vma) -1;
+ h->needs_plt = 0;
+ }
+ }
+ else
+ {
+ h->plt.offset = (bfd_vma) -1;
+ h->needs_plt = 0;
+ }
+
+ /* If R_X86_64_GOTTPOFF symbol is now local to the binary,
+ make it a R_X86_64_TPOFF32 requiring no GOT entry. */
+ if (h->got.refcount > 0
+ && !info->shared
+ && h->dynindx == -1
+ && elf64_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
+ h->got.offset = (bfd_vma) -1;
+ else if (h->got.refcount > 0)
+ {
+ asection *s;
+ bfd_boolean dyn;
+ int tls_type = elf64_x86_64_hash_entry (h)->tls_type;
+
+ /* Make sure this symbol is output as a dynamic symbol.
+ Undefined weak syms won't yet be marked as dynamic. */
+ if (h->dynindx == -1
+ && !h->forced_local)
+ {
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ s = htab->sgot;
+ h->got.offset = s->size;
+ s->size += GOT_ENTRY_SIZE;
+ /* R_X86_64_TLSGD needs 2 consecutive GOT slots. */
+ if (tls_type == GOT_TLS_GD)
+ s->size += GOT_ENTRY_SIZE;
+ dyn = htab->elf.dynamic_sections_created;
+ /* R_X86_64_TLSGD needs one dynamic relocation if local symbol
+ and two if global.
+ R_X86_64_GOTTPOFF needs one dynamic relocation. */
+ if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
+ || tls_type == GOT_TLS_IE)
+ htab->srelgot->size += sizeof (Elf64_External_Rela);
+ else if (tls_type == GOT_TLS_GD)
+ htab->srelgot->size += 2 * sizeof (Elf64_External_Rela);
+ else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ || h->root.type != bfd_link_hash_undefweak)
+ && (info->shared
+ || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
+ htab->srelgot->size += sizeof (Elf64_External_Rela);
+ }
+ else
+ h->got.offset = (bfd_vma) -1;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+ if (eh->dyn_relocs == NULL)
+ return TRUE;
+
+ /* In the shared -Bsymbolic case, discard space allocated for
+ dynamic pc-relative relocs against symbols which turn out to be
+ defined in regular objects. For the normal shared case, discard
+ space for pc-relative relocs that have become local due to symbol
+ visibility changes. */
+
+ if (info->shared)
+ {
+ /* Relocs that use pc_count are those that appear on a call
+ insn, or certain REL relocs that can generated via assembly.
+ We want calls to protected symbols to resolve directly to the
+ function rather than going via the plt. If people want
+ function pointer comparisons to work as expected then they
+ should avoid writing weird assembly. */
+ if (SYMBOL_CALLS_LOCAL (info, h))
+ {
+ struct elf64_x86_64_dyn_relocs **pp;
+
+ for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
+ {
+ p->count -= p->pc_count;
+ p->pc_count = 0;
+ if (p->count == 0)
+ *pp = p->next;
+ else
+ pp = &p->next;
+ }
+ }
+
+ /* Also discard relocs on undefined weak syms with non-default
+ visibility. */
+ if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+ && h->root.type == bfd_link_hash_undefweak)
+ eh->dyn_relocs = NULL;
+ }
+ else if (ELIMINATE_COPY_RELOCS)
+ {
+ /* For the non-shared case, discard space for relocs against
+ symbols which turn out to need copy relocs or are not
+ dynamic. */
+
+ if (!h->non_got_ref
+ && ((h->def_dynamic
+ && !h->def_regular)
+ || (htab->elf.dynamic_sections_created
+ && (h->root.type == bfd_link_hash_undefweak
+ || h->root.type == bfd_link_hash_undefined))))
+ {
+ /* Make sure this symbol is output as a dynamic symbol.
+ Undefined weak syms won't yet be marked as dynamic. */
+ if (h->dynindx == -1
+ && !h->forced_local)
+ {
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+
+ /* If that succeeded, we know we'll be keeping all the
+ relocs. */
+ if (h->dynindx != -1)
+ goto keep;
+ }
+
+ eh->dyn_relocs = NULL;
+
+ keep: ;
+ }
+
+ /* Finally, allocate space. */
+ for (p = eh->dyn_relocs; p != NULL; p = p->next)
+ {
+ asection *sreloc = elf_section_data (p->sec)->sreloc;
+ sreloc->size += p->count * sizeof (Elf64_External_Rela);
+ }
+
+ return TRUE;
+}
+
+/* Find any dynamic relocs that apply to read-only sections. */
+
+static bfd_boolean
+readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
+{
+ struct elf64_x86_64_link_hash_entry *eh;
+ struct elf64_x86_64_dyn_relocs *p;
+
+ if (h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+ for (p = eh->dyn_relocs; p != NULL; p = p->next)
+ {
+ asection *s = p->sec->output_section;
+
+ if (s != NULL && (s->flags & SEC_READONLY) != 0)
+ {
+ struct bfd_link_info *info = (struct bfd_link_info *) inf;
+
+ info->flags |= DF_TEXTREL;
+
+ /* Not an error, just cut short the traversal. */
+ return FALSE;
+ }
+ }
+ return TRUE;
}
/* Set the sizes of the dynamic sections. */
-static boolean
-elf64_x86_64_size_dynamic_sections (output_bfd, info)
- bfd *output_bfd;
- struct bfd_link_info *info;
+static bfd_boolean
+elf64_x86_64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info)
{
+ struct elf64_x86_64_link_hash_table *htab;
bfd *dynobj;
asection *s;
- boolean plt;
- boolean relocs;
- boolean reltext;
+ bfd_boolean relocs;
+ bfd *ibfd;
- dynobj = elf_hash_table (info)->dynobj;
- BFD_ASSERT (dynobj != NULL);
+ htab = elf64_x86_64_hash_table (info);
+ dynobj = htab->elf.dynobj;
+ if (dynobj == NULL)
+ abort ();
- if (elf_hash_table (info)->dynamic_sections_created)
+ if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
- if (! info->shared)
+ if (info->executable)
{
s = bfd_get_section_by_name (dynobj, ".interp");
- BFD_ASSERT (s != NULL);
- s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
+ if (s == NULL)
+ abort ();
+ s->size = sizeof ELF_DYNAMIC_INTERPRETER;
s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
}
}
- else
+
+ /* Set up .got offsets for local syms, and space for local dynamic
+ relocs. */
+ for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
{
- /* We may have created entries in the .rela.got section.
- However, if we are not creating the dynamic sections, we will
- not actually use these entries. Reset the size of .rela.got,
- which will cause it to get stripped from the output file
- below. */
- s = bfd_get_section_by_name (dynobj, ".rela.got");
- if (s != NULL)
- s->_raw_size = 0;
+ bfd_signed_vma *local_got;
+ bfd_signed_vma *end_local_got;
+ char *local_tls_type;
+ bfd_size_type locsymcount;
+ Elf_Internal_Shdr *symtab_hdr;
+ asection *srel;
+
+ if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
+ continue;
+
+ for (s = ibfd->sections; s != NULL; s = s->next)
+ {
+ struct elf64_x86_64_dyn_relocs *p;
+
+ for (p = *((struct elf64_x86_64_dyn_relocs **)
+ &elf_section_data (s)->local_dynrel);
+ p != NULL;
+ p = p->next)
+ {
+ if (!bfd_is_abs_section (p->sec)
+ && bfd_is_abs_section (p->sec->output_section))
+ {
+ /* Input section has been discarded, either because
+ it is a copy of a linkonce section or due to
+ linker script /DISCARD/, so we'll be discarding
+ the relocs too. */
+ }
+ else if (p->count != 0)
+ {
+ srel = elf_section_data (p->sec)->sreloc;
+ srel->size += p->count * sizeof (Elf64_External_Rela);
+ if ((p->sec->output_section->flags & SEC_READONLY) != 0)
+ info->flags |= DF_TEXTREL;
+
+ }
+ }
+ }
+
+ local_got = elf_local_got_refcounts (ibfd);
+ if (!local_got)
+ continue;
+
+ symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
+ locsymcount = symtab_hdr->sh_info;
+ end_local_got = local_got + locsymcount;
+ local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
+ s = htab->sgot;
+ srel = htab->srelgot;
+ for (; local_got < end_local_got; ++local_got, ++local_tls_type)
+ {
+ if (*local_got > 0)
+ {
+ *local_got = s->size;
+ s->size += GOT_ENTRY_SIZE;
+ if (*local_tls_type == GOT_TLS_GD)
+ s->size += GOT_ENTRY_SIZE;
+ if (info->shared
+ || *local_tls_type == GOT_TLS_GD
+ || *local_tls_type == GOT_TLS_IE)
+ srel->size += sizeof (Elf64_External_Rela);
+ }
+ else
+ *local_got = (bfd_vma) -1;
+ }
}
- /* If this is a -Bsymbolic shared link, then we need to discard all
- PC relative relocs against symbols defined in a regular object.
- We allocated space for them in the check_relocs routine, but we
- will not fill them in in the relocate_section routine. */
- if (info->shared)
- elf64_x86_64_link_hash_traverse (elf64_x86_64_hash_table (info),
- elf64_x86_64_discard_copies,
- (PTR) info);
-
- /* The check_relocs and adjust_dynamic_symbol entry points have
- determined the sizes of the various dynamic sections. Allocate
- memory for them. */
- plt = relocs = reltext = false;
- for (s = dynobj->sections; s != NULL; s = s->next)
+ if (htab->tls_ld_got.refcount > 0)
{
- const char *name;
- boolean strip;
+ /* Allocate 2 got entries and 1 dynamic reloc for R_X86_64_TLSLD
+ relocs. */
+ htab->tls_ld_got.offset = htab->sgot->size;
+ htab->sgot->size += 2 * GOT_ENTRY_SIZE;
+ htab->srelgot->size += sizeof (Elf64_External_Rela);
+ }
+ else
+ htab->tls_ld_got.offset = -1;
+
+ /* Allocate global sym .plt and .got entries, and space for global
+ sym dynamic relocs. */
+ elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
+ /* We now have determined the sizes of the various dynamic sections.
+ Allocate memory for them. */
+ relocs = FALSE;
+ for (s = dynobj->sections; s != NULL; s = s->next)
+ {
if ((s->flags & SEC_LINKER_CREATED) == 0)
continue;
- /* It's OK to base decisions on the section name, because none
- of the dynobj section names depend upon the input files. */
- name = bfd_get_section_name (dynobj, s);
-
- strip = false;
- if (strcmp (name, ".plt") == 0)
+ if (s == htab->splt
+ || s == htab->sgot
+ || s == htab->sgotplt)
{
- if (s->_raw_size == 0)
- {
- /* Strip this section if we don't need it; see the
- comment below. */
- strip = true;
- }
- else
- {
- /* Remember whether there is a PLT. */
- plt = true;
- }
+ /* Strip this section if we don't need it; see the
+ comment below. */
}
- else if (strncmp (name, ".rela", 5) == 0)
+ else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
{
- if (s->_raw_size == 0)
- {
- /* If we don't need this section, strip it from the
- output file. This is mostly to handle .rela.bss and
- .rela.plt. We must create both sections in
- create_dynamic_sections, because they must be created
- before the linker maps input sections to output
- sections. The linker does that before
- adjust_dynamic_symbol is called, and it is that
- function which decides whether anything needs to go
- into these sections. */
- strip = true;
- }
- else
- {
- asection *target;
-
- /* Remember whether there are any reloc sections other
- than .rela.plt. */
- if (strcmp (name, ".rela.plt") != 0)
- {
- const char *outname;
-
- relocs = true;
-
- /* If this relocation section applies to a read only
- section, then we probably need a DT_TEXTREL
- entry. The entries in the .rela.plt section
- really apply to the .got section, which we
- created ourselves and so know is not readonly. */
- outname = bfd_get_section_name (output_bfd,
- s->output_section);
- target = bfd_get_section_by_name (output_bfd, outname + 5);
- if (target != NULL
- && (target->flags & SEC_READONLY) != 0
- && (target->flags & SEC_ALLOC) != 0)
- reltext = true;
- }
+ if (s->size != 0 && s != htab->srelplt)
+ relocs = TRUE;
- /* We use the reloc_count field as a counter if we need
- to copy relocs into the output file. */
- s->reloc_count = 0;
- }
+ /* We use the reloc_count field as a counter if we need
+ to copy relocs into the output file. */
+ s->reloc_count = 0;
}
- else if (strncmp (name, ".got", 4) != 0)
+ else
{
/* It's not one of our sections, so don't allocate space. */
continue;
}
- if (strip)
+ if (s->size == 0)
{
+ /* If we don't need this section, strip it from the
+ output file. This is mostly to handle .rela.bss and
+ .rela.plt. We must create both sections in
+ create_dynamic_sections, because they must be created
+ before the linker maps input sections to output
+ sections. The linker does that before
+ adjust_dynamic_symbol is called, and it is that
+ function which decides whether anything needs to go
+ into these sections. */
+
_bfd_strip_section_from_output (info, s);
continue;
}
section's contents are written out. This should not happen,
but this way if it does, we get a R_X86_64_NONE reloc instead
of garbage. */
- s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
- if (s->contents == NULL && s->_raw_size != 0)
- return false;
+ s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
+ if (s->contents == NULL)
+ return FALSE;
}
- if (elf_hash_table (info)->dynamic_sections_created)
+ if (htab->elf.dynamic_sections_created)
{
/* Add some entries to the .dynamic section. We fill in the
values later, in elf64_x86_64_finish_dynamic_sections, but we
must add the entries now so that we get the correct size for
- the .dynamic section. The DT_DEBUG entry is filled in by the
+ the .dynamic section. The DT_DEBUG entry is filled in by the
dynamic linker and used by the debugger. */
- if (! info->shared)
- {
- if (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0))
- return false;
- }
+#define add_dynamic_entry(TAG, VAL) \
+ _bfd_elf_add_dynamic_entry (info, TAG, VAL)
- if (plt)
+ if (info->executable)
{
- /* FIXME: Are all these needed? */
- if (! bfd_elf64_add_dynamic_entry (info, DT_PLTGOT, 0)
- || ! bfd_elf64_add_dynamic_entry (info, DT_PLTRELSZ, 0)
- || ! bfd_elf64_add_dynamic_entry (info, DT_PLTREL, DT_REL)
- || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 0))
- return false;
+ if (!add_dynamic_entry (DT_DEBUG, 0))
+ return FALSE;
}
- if (relocs)
+ if (htab->splt->size != 0)
{
- if (! bfd_elf64_add_dynamic_entry (info, DT_RELA, 0)
- || ! bfd_elf64_add_dynamic_entry (info, DT_RELASZ, 0)
- || ! bfd_elf64_add_dynamic_entry (info, DT_RELAENT,
- sizeof (Elf64_External_Rela)))
- return false;
+ if (!add_dynamic_entry (DT_PLTGOT, 0)
+ || !add_dynamic_entry (DT_PLTRELSZ, 0)
+ || !add_dynamic_entry (DT_PLTREL, DT_RELA)
+ || !add_dynamic_entry (DT_JMPREL, 0))
+ return FALSE;
}
- if (reltext)
+ if (relocs)
{
- if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0))
- return false;
- info->flags |= DF_TEXTREL;
+ if (!add_dynamic_entry (DT_RELA, 0)
+ || !add_dynamic_entry (DT_RELASZ, 0)
+ || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela)))
+ return FALSE;
+
+ /* If any dynamic relocs apply to a read-only section,
+ then we need a DT_TEXTREL entry. */
+ if ((info->flags & DF_TEXTREL) == 0)
+ elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
+ (PTR) info);
+
+ if ((info->flags & DF_TEXTREL) != 0)
+ {
+ if (!add_dynamic_entry (DT_TEXTREL, 0))
+ return FALSE;
+ }
}
}
+#undef add_dynamic_entry
- return true;
+ return TRUE;
}
-/* This function is called via elf64_x86_64_link_hash_traverse if we are
- creating a shared object. In the -Bsymbolic case, it discards the
- space allocated to copy PC relative relocs against symbols which
- are defined in regular objects. For the normal non-symbolic case,
- we also discard space for relocs that have become local due to
- symbol visibility changes. We allocated space for them in the
- check_relocs routine, but we won't fill them in in the
- relocate_section routine. */
-
-static boolean
-elf64_x86_64_discard_copies (h, inf)
- struct elf64_x86_64_link_hash_entry *h;
- PTR inf;
+/* Return the base VMA address which should be subtracted from real addresses
+ when resolving @dtpoff relocation.
+ This is PT_TLS segment p_vaddr. */
+
+static bfd_vma
+dtpoff_base (struct bfd_link_info *info)
{
- struct elf64_x86_64_pcrel_relocs_copied *s;
- struct bfd_link_info *info = (struct bfd_link_info *) inf;
-
- /* If a symbol has been forced local or we have found a regular
- definition for the symbolic link case, then we won't be needing
- any relocs. */
- if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
- && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
- || info->symbolic))
- {
- for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
- s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela);
- }
+ /* If tls_sec is NULL, we should have signalled an error already. */
+ if (elf_hash_table (info)->tls_sec == NULL)
+ return 0;
+ return elf_hash_table (info)->tls_sec->vma;
+}
+
+/* Return the relocation value for @tpoff relocation
+ if STT_TLS virtual address is ADDRESS. */
+
+static bfd_vma
+tpoff (struct bfd_link_info *info, bfd_vma address)
+{
+ struct elf_link_hash_table *htab = elf_hash_table (info);
+
+ /* If tls_segment is NULL, we should have signalled an error already. */
+ if (htab->tls_sec == NULL)
+ return 0;
+ return address - htab->tls_size - htab->tls_sec->vma;
+}
+
+/* Is the instruction before OFFSET in CONTENTS a 32bit relative
+ branch? */
- return true;
+static bfd_boolean
+is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
+{
+ /* Opcode Instruction
+ 0xe8 call
+ 0xe9 jump
+ 0x0f 0x8x conditional jump */
+ return ((offset > 0
+ && (contents [offset - 1] == 0xe8
+ || contents [offset - 1] == 0xe9))
+ || (offset > 1
+ && contents [offset - 2] == 0x0f
+ && (contents [offset - 1] & 0xf0) == 0x80));
}
/* Relocate an x86_64 ELF section. */
-static boolean
-elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
- contents, relocs, local_syms, local_sections)
- bfd *output_bfd;
- struct bfd_link_info *info;
- bfd *input_bfd;
- asection *input_section;
- bfd_byte *contents;
- Elf_Internal_Rela *relocs;
- Elf_Internal_Sym *local_syms;
- asection **local_sections;
+static bfd_boolean
+elf64_x86_64_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
+ bfd *input_bfd, asection *input_section,
+ bfd_byte *contents, Elf_Internal_Rela *relocs,
+ Elf_Internal_Sym *local_syms,
+ asection **local_sections)
{
- bfd *dynobj;
+ struct elf64_x86_64_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
bfd_vma *local_got_offsets;
- asection *sgot;
- asection *splt;
- asection *sreloc;
- Elf_Internal_Rela *rela;
+ Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
- dynobj = elf_hash_table (info)->dynobj;
+ if (info->relocatable)
+ return TRUE;
+
+ htab = elf64_x86_64_hash_table (info);
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
local_got_offsets = elf_local_got_offsets (input_bfd);
- sreloc = splt = sgot = NULL;
- if (dynobj != NULL)
- {
- splt = bfd_get_section_by_name (dynobj, ".plt");
- sgot = bfd_get_section_by_name (dynobj, ".got");
- }
-
- rela = relocs;
+ rel = relocs;
relend = relocs + input_section->reloc_count;
- for (; rela < relend; rela++)
+ for (; rel < relend; rel++)
{
- int r_type;
+ unsigned int r_type;
reloc_howto_type *howto;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
asection *sec;
+ bfd_vma off;
bfd_vma relocation;
+ bfd_boolean unresolved_reloc;
bfd_reloc_status_type r;
- unsigned int indx;
+ int tls_type;
- r_type = ELF64_R_TYPE (rela->r_info);
+ r_type = ELF64_R_TYPE (rel->r_info);
+ if (r_type == (int) R_X86_64_GNU_VTINHERIT
+ || r_type == (int) R_X86_64_GNU_VTENTRY)
+ continue;
- if ((indx = (unsigned) r_type) >= R_X86_64_max)
+ if (r_type >= R_X86_64_max)
{
bfd_set_error (bfd_error_bad_value);
- return false;
- }
- howto = x86_64_elf_howto_table + indx;
-
- r_symndx = ELF64_R_SYM (rela->r_info);
-
- if (info->relocateable)
- {
- /* This is a relocateable link. We don't have to change
- anything, unless the reloc is against a section symbol,
- in which case we have to adjust according to where the
- section symbol winds up in the output section. */
- if (r_symndx < symtab_hdr->sh_info)
- {
- sym = local_syms + r_symndx;
- if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
- {
- sec = local_sections[r_symndx];
- rela->r_addend += sec->output_offset + sym->st_value;
- }
- }
-
- continue;
+ return FALSE;
}
- /* This is a final link. */
+ howto = x86_64_elf_howto_table + r_type;
+ r_symndx = ELF64_R_SYM (rel->r_info);
h = NULL;
sym = NULL;
sec = NULL;
+ unresolved_reloc = FALSE;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
- relocation = (sec->output_section->vma
- + sec->output_offset
- + sym->st_value);
+
+ relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
}
else
{
- h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- while (h->root.type == bfd_link_hash_indirect
- || h->root.type == bfd_link_hash_warning)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
- if (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak)
- {
- sec = h->root.u.def.section;
- if (sec->output_section == NULL)
- {
- (*_bfd_error_handler)
- (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
- bfd_get_filename (input_bfd), h->root.root.string,
- bfd_get_section_name (input_bfd, input_section));
- relocation = 0;
- }
- else
- relocation = (h->root.u.def.value
- + sec->output_section->vma
- + sec->output_offset);
- }
- else if (h->root.type == bfd_link_hash_undefweak)
- relocation = 0;
- else if (info->shared && !info->symbolic && !info->no_undefined
- && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
- relocation = 0;
- else
- {
- if (! ((*info->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd,
- input_section, rela->r_offset,
- (!info->shared || info->no_undefined
- || ELF_ST_VISIBILITY (h->other)))))
- return false;
- relocation = 0;
- }
- }
+ bfd_boolean warned;
+ RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
+ r_symndx, symtab_hdr, sym_hashes,
+ h, sec, relocation,
+ unresolved_reloc, warned);
+ }
/* When generating a shared object, the relocations handled here are
copied into the output file to be resolved at run time. */
switch (r_type)
case R_X86_64_GOT32:
/* Relocation is to the entry for this symbol in the global
offset table. */
- BFD_ASSERT (sgot != NULL);
+ case R_X86_64_GOTPCREL:
+ /* Use global offset table as symbol value. */
+ if (htab->sgot == NULL)
+ abort ();
if (h != NULL)
{
- bfd_vma off = h->got.offset;
- BFD_ASSERT (off != (bfd_vma) -1);
+ bfd_boolean dyn;
- if (! elf_hash_table (info)->dynamic_sections_created
+ off = h->got.offset;
+ dyn = htab->elf.dynamic_sections_created;
+
+ if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
|| (info->shared
- && (info->symbolic || h->dynindx == -1)
- && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
+ && SYMBOL_REFERENCES_LOCAL (info, h))
+ || (ELF_ST_VISIBILITY (h->other)
+ && h->root.type == bfd_link_hash_undefweak))
{
/* This is actually a static link, or it is a -Bsymbolic
link and the symbol is defined locally, or the symbol
- was forced to be local because of a version file. We
+ was forced to be local because of a version file. We
must initialize this entry in the global offset table.
Since the offset must always be a multiple of 8, we
use the least significant bit to record whether we
have initialized it already.
When doing a dynamic link, we create a .rela.got
- relocation entry to initialize the value. This is
- done in the finish_dynamic_symbol routine. */
+ relocation entry to initialize the value. This is
+ done in the finish_dynamic_symbol routine. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_64 (output_bfd, relocation,
- sgot->contents + off);
+ htab->sgot->contents + off);
h->got.offset |= 1;
}
}
- relocation = sgot->output_offset + off;
+ else
+ unresolved_reloc = FALSE;
}
else
{
- bfd_vma off;
-
- BFD_ASSERT (local_got_offsets != NULL
- && local_got_offsets[r_symndx] != (bfd_vma) -1);
+ if (local_got_offsets == NULL)
+ abort ();
off = local_got_offsets[r_symndx];
/* The offset must always be a multiple of 8. We use
- the least significant bit to record whether we have
- already generated the necessary reloc. */
+ the least significant bit to record whether we have
+ already generated the necessary reloc. */
if ((off & 1) != 0)
off &= ~1;
else
{
- bfd_put_64 (output_bfd, relocation, sgot->contents + off);
+ bfd_put_64 (output_bfd, relocation,
+ htab->sgot->contents + off);
- if (info->shared)
+ if (info->shared)
{
- asection *srelgot;
+ asection *s;
Elf_Internal_Rela outrel;
+ bfd_byte *loc;
/* We need to generate a R_X86_64_RELATIVE reloc
for the dynamic linker. */
- srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
- BFD_ASSERT (srelgot != NULL);
+ s = htab->srelgot;
+ if (s == NULL)
+ abort ();
- outrel.r_offset = (sgot->output_section->vma
- + sgot->output_offset
+ outrel.r_offset = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset
+ off);
outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
outrel.r_addend = relocation;
- bfd_elf64_swap_reloca_out (output_bfd, &outrel,
- (((Elf64_External_Rela *)
- srelgot->contents)
- + srelgot->reloc_count));
- ++srelgot->reloc_count;
+ loc = s->contents;
+ loc += s->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
}
local_got_offsets[r_symndx] |= 1;
}
-
- relocation = sgot->output_offset + off;
}
- break;
-
- case R_X86_64_GOTPCREL:
- /* Use global offset table as symbol value. */
-
- if (sgot == NULL)
- {
- sgot = bfd_get_section_by_name (dynobj, ".got");
- BFD_ASSERT (sgot != NULL);
- }
+ if (off >= (bfd_vma) -2)
+ abort ();
- relocation = sgot->output_section->vma + (h->got.offset & ~1);
+ relocation = htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off;
+ if (r_type != R_X86_64_GOTPCREL)
+ relocation -= htab->sgotplt->output_section->vma
+ - htab->sgotplt->output_offset;
break;
procedure linkage table. */
/* Resolve a PLT32 reloc against a local symbol directly,
- without using the procedure linkage table. */
+ without using the procedure linkage table. */
if (h == NULL)
break;
- if (h->plt.offset == (bfd_vma) -1 || splt == NULL)
+ if (h->plt.offset == (bfd_vma) -1
+ || htab->splt == NULL)
{
/* We didn't make a PLT entry for this symbol. This
- happens when statically linking PIC code, or when
- using -Bsymbolic. */
+ happens when statically linking PIC code, or when
+ using -Bsymbolic. */
break;
}
- relocation = (splt->output_section->vma
- + splt->output_offset
+ relocation = (htab->splt->output_section->vma
+ + htab->splt->output_offset
+ h->plt.offset);
+ unresolved_reloc = FALSE;
break;
- case R_X86_64_8:
- case R_X86_64_16:
- case R_X86_64_32:
case R_X86_64_PC8:
case R_X86_64_PC16:
case R_X86_64_PC32:
- /* FIXME: The abi says the linker should make sure the value is
- the same when it's zeroextended to 64 bit. */
if (info->shared
+ && !SYMBOL_REFERENCES_LOCAL (info, h)
&& (input_section->flags & SEC_ALLOC) != 0
- && ((r_type != R_X86_64_PC8 && r_type != R_X86_64_PC16
- && r_type != R_X86_64_PC32)
- || (h != NULL
- && h->dynindx != -1
- && (! info->symbolic
- || (h->elf_link_hash_flags
- & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+ && (input_section->flags & SEC_READONLY) != 0
+ && (!h->def_regular
+ || r_type != R_X86_64_PC32
+ || h->type != STT_FUNC
+ || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED
+ || !is_32bit_relative_branch (contents,
+ rel->r_offset)))
+ {
+ if (h->def_regular
+ && r_type == R_X86_64_PC32
+ && h->type == STT_FUNC
+ && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
+ (*_bfd_error_handler)
+ (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"),
+ input_bfd, h->root.root.string);
+ else
+ (*_bfd_error_handler)
+ (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
+ input_bfd, x86_64_elf_howto_table[r_type].name,
+ h->root.root.string);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+ /* Fall through. */
+
+ case R_X86_64_8:
+ case R_X86_64_16:
+ case R_X86_64_32:
+ case R_X86_64_64:
+ /* FIXME: The ABI says the linker should make sure the value is
+ the same when it's zeroextended to 64 bit. */
+
+ /* r_symndx will be zero only for relocs against symbols
+ from removed linkonce sections, or sections discarded by
+ a linker script. */
+ if (r_symndx == 0
+ || (input_section->flags & SEC_ALLOC) == 0)
+ break;
+
+ if ((info->shared
+ && (h == NULL
+ || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ || h->root.type != bfd_link_hash_undefweak)
+ && ((r_type != R_X86_64_PC8
+ && r_type != R_X86_64_PC16
+ && r_type != R_X86_64_PC32)
+ || !SYMBOL_CALLS_LOCAL (info, h)))
+ || (ELIMINATE_COPY_RELOCS
+ && !info->shared
+ && h != NULL
+ && h->dynindx != -1
+ && !h->non_got_ref
+ && ((h->def_dynamic
+ && !h->def_regular)
+ || h->root.type == bfd_link_hash_undefweak
+ || h->root.type == bfd_link_hash_undefined)))
{
Elf_Internal_Rela outrel;
- boolean skip, relocate;
+ bfd_byte *loc;
+ bfd_boolean skip, relocate;
+ asection *sreloc;
/* When generating a shared object, these relocations
are copied into the output file to be resolved at run
- time. */
-
- if (sreloc == NULL)
- {
- const char *name;
-
- name = (bfd_elf_string_from_elf_section
- (input_bfd,
- elf_elfheader (input_bfd)->e_shstrndx,
- elf_section_data (input_section)->rel_hdr.sh_name));
- if (name == NULL)
- return false;
-
- BFD_ASSERT (strncmp (name, ".rela", 5) == 0
- && strcmp (bfd_get_section_name (input_bfd,
- input_section),
- name + 5) == 0);
-
- sreloc = bfd_get_section_by_name (dynobj, name);
- BFD_ASSERT (sreloc != NULL);
- }
-
- skip = false;
-
- if (elf_section_data (input_section)->stab_info == NULL)
- outrel.r_offset = rela->r_offset;
- else
- {
- bfd_vma off;
-
- off = (_bfd_stab_section_offset
- (output_bfd, &elf_hash_table (info)->stab_info,
- input_section,
- &elf_section_data (input_section)->stab_info,
- rela->r_offset));
- if (off == (bfd_vma) -1)
- skip = true;
- outrel.r_offset = off;
- }
+ time. */
+ skip = FALSE;
+ relocate = FALSE;
+
+ outrel.r_offset =
+ _bfd_elf_section_offset (output_bfd, info, input_section,
+ rel->r_offset);
+ if (outrel.r_offset == (bfd_vma) -1)
+ skip = TRUE;
+ else if (outrel.r_offset == (bfd_vma) -2)
+ skip = TRUE, relocate = TRUE;
outrel.r_offset += (input_section->output_section->vma
+ input_section->output_offset);
if (skip)
+ memset (&outrel, 0, sizeof outrel);
+
+ /* h->dynindx may be -1 if this symbol was marked to
+ become local. */
+ else if (h != NULL
+ && h->dynindx != -1
+ && (r_type == R_X86_64_PC8
+ || r_type == R_X86_64_PC16
+ || r_type == R_X86_64_PC32
+ || !info->shared
+ || !info->symbolic
+ || !h->def_regular))
{
- memset (&outrel, 0, sizeof outrel);
- relocate = false;
- }
- else if ((r_type == R_X86_64_PC8) || (r_type == R_X86_64_PC16)
- || (r_type == R_X86_64_PC32))
- {
- BFD_ASSERT (h != NULL && h->dynindx != -1);
- relocate = false;
outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
- outrel.r_addend = relocation + rela->r_addend;
+ outrel.r_addend = rel->r_addend;
}
else
{
- /* h->dynindx may be -1 if this symbol was marked to
- become local. */
- if (h == NULL
- || ((info->symbolic || h->dynindx == -1)
- && (h->elf_link_hash_flags
- & ELF_LINK_HASH_DEF_REGULAR) != 0))
+ /* This symbol is local, or marked to become local. */
+ if (r_type == R_X86_64_64)
{
- relocate = true;
+ relocate = TRUE;
outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
- outrel.r_addend = relocation + rela->r_addend;
+ outrel.r_addend = relocation + rel->r_addend;
}
else
{
- BFD_ASSERT (h->dynindx != -1);
- relocate = false;
- outrel.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_32);
- outrel.r_addend = relocation + rela->r_addend;
+ long sindx;
+
+ if (bfd_is_abs_section (sec))
+ sindx = 0;
+ else if (sec == NULL || sec->owner == NULL)
+ {
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+ else
+ {
+ asection *osec;
+
+ osec = sec->output_section;
+ sindx = elf_section_data (osec)->dynindx;
+ BFD_ASSERT (sindx > 0);
+ }
+
+ outrel.r_info = ELF64_R_INFO (sindx, r_type);
+ outrel.r_addend = relocation + rel->r_addend;
}
}
- bfd_elf64_swap_reloca_out (output_bfd, &outrel,
- (((Elf64_External_Rela *)
- sreloc->contents)
- + sreloc->reloc_count));
- ++sreloc->reloc_count;
+ sreloc = elf_section_data (input_section)->sreloc;
+ if (sreloc == NULL)
+ abort ();
+
+ loc = sreloc->contents;
+ loc += sreloc->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
/* If this reloc is against an external symbol, we do
not want to fiddle with the addend. Otherwise, we
break;
+ case R_X86_64_TLSGD:
+ case R_X86_64_GOTTPOFF:
+ r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
+ tls_type = GOT_UNKNOWN;
+ if (h == NULL && local_got_offsets)
+ tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
+ else if (h != NULL)
+ {
+ tls_type = elf64_x86_64_hash_entry (h)->tls_type;
+ if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE)
+ r_type = R_X86_64_TPOFF32;
+ }
+ if (r_type == R_X86_64_TLSGD)
+ {
+ if (tls_type == GOT_TLS_IE)
+ r_type = R_X86_64_GOTTPOFF;
+ }
+
+ if (r_type == R_X86_64_TPOFF32)
+ {
+ BFD_ASSERT (! unresolved_reloc);
+ if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
+ {
+ unsigned int i;
+ static unsigned char tlsgd[8]
+ = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
+
+ /* GD->LE transition.
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@plt
+ Change it into:
+ movq %fs:0, %rax
+ leaq foo@tpoff(%rax), %rax */
+ BFD_ASSERT (rel->r_offset >= 4);
+ for (i = 0; i < 4; i++)
+ BFD_ASSERT (bfd_get_8 (input_bfd,
+ contents + rel->r_offset - 4 + i)
+ == tlsgd[i]);
+ BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
+ for (i = 0; i < 4; i++)
+ BFD_ASSERT (bfd_get_8 (input_bfd,
+ contents + rel->r_offset + 4 + i)
+ == tlsgd[i+4]);
+ BFD_ASSERT (rel + 1 < relend);
+ BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
+ memcpy (contents + rel->r_offset - 4,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
+ 16);
+ bfd_put_32 (output_bfd, tpoff (info, relocation),
+ contents + rel->r_offset + 8);
+ /* Skip R_X86_64_PLT32. */
+ rel++;
+ continue;
+ }
+ else
+ {
+ unsigned int val, type, reg;
+
+ /* IE->LE transition:
+ Originally it can be one of:
+ movq foo@gottpoff(%rip), %reg
+ addq foo@gottpoff(%rip), %reg
+ We change it into:
+ movq $foo, %reg
+ leaq foo(%reg), %reg
+ addq $foo, %reg. */
+ BFD_ASSERT (rel->r_offset >= 3);
+ val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3);
+ BFD_ASSERT (val == 0x48 || val == 0x4c);
+ type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
+ BFD_ASSERT (type == 0x8b || type == 0x03);
+ reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
+ BFD_ASSERT ((reg & 0xc7) == 5);
+ reg >>= 3;
+ BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
+ if (type == 0x8b)
+ {
+ /* movq */
+ if (val == 0x4c)
+ bfd_put_8 (output_bfd, 0x49,
+ contents + rel->r_offset - 3);
+ bfd_put_8 (output_bfd, 0xc7,
+ contents + rel->r_offset - 2);
+ bfd_put_8 (output_bfd, 0xc0 | reg,
+ contents + rel->r_offset - 1);
+ }
+ else if (reg == 4)
+ {
+ /* addq -> addq - addressing with %rsp/%r12 is
+ special */
+ if (val == 0x4c)
+ bfd_put_8 (output_bfd, 0x49,
+ contents + rel->r_offset - 3);
+ bfd_put_8 (output_bfd, 0x81,
+ contents + rel->r_offset - 2);
+ bfd_put_8 (output_bfd, 0xc0 | reg,
+ contents + rel->r_offset - 1);
+ }
+ else
+ {
+ /* addq -> leaq */
+ if (val == 0x4c)
+ bfd_put_8 (output_bfd, 0x4d,
+ contents + rel->r_offset - 3);
+ bfd_put_8 (output_bfd, 0x8d,
+ contents + rel->r_offset - 2);
+ bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
+ contents + rel->r_offset - 1);
+ }
+ bfd_put_32 (output_bfd, tpoff (info, relocation),
+ contents + rel->r_offset);
+ continue;
+ }
+ }
+
+ if (htab->sgot == NULL)
+ abort ();
+
+ if (h != NULL)
+ off = h->got.offset;
+ else
+ {
+ if (local_got_offsets == NULL)
+ abort ();
+
+ off = local_got_offsets[r_symndx];
+ }
+
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ Elf_Internal_Rela outrel;
+ bfd_byte *loc;
+ int dr_type, indx;
+
+ if (htab->srelgot == NULL)
+ abort ();
+
+ outrel.r_offset = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off);
+
+ indx = h && h->dynindx != -1 ? h->dynindx : 0;
+ if (r_type == R_X86_64_TLSGD)
+ dr_type = R_X86_64_DTPMOD64;
+ else
+ dr_type = R_X86_64_TPOFF64;
+
+ bfd_put_64 (output_bfd, 0, htab->sgot->contents + off);
+ outrel.r_addend = 0;
+ if (dr_type == R_X86_64_TPOFF64 && indx == 0)
+ outrel.r_addend = relocation - dtpoff_base (info);
+ outrel.r_info = ELF64_R_INFO (indx, dr_type);
+
+ loc = htab->srelgot->contents;
+ loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
+
+ if (r_type == R_X86_64_TLSGD)
+ {
+ if (indx == 0)
+ {
+ BFD_ASSERT (! unresolved_reloc);
+ bfd_put_64 (output_bfd,
+ relocation - dtpoff_base (info),
+ htab->sgot->contents + off + GOT_ENTRY_SIZE);
+ }
+ else
+ {
+ bfd_put_64 (output_bfd, 0,
+ htab->sgot->contents + off + GOT_ENTRY_SIZE);
+ outrel.r_info = ELF64_R_INFO (indx,
+ R_X86_64_DTPOFF64);
+ outrel.r_offset += GOT_ENTRY_SIZE;
+ htab->srelgot->reloc_count++;
+ loc += sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
+ }
+ }
+
+ if (h != NULL)
+ h->got.offset |= 1;
+ else
+ local_got_offsets[r_symndx] |= 1;
+ }
+
+ if (off >= (bfd_vma) -2)
+ abort ();
+ if (r_type == ELF64_R_TYPE (rel->r_info))
+ {
+ relocation = htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off;
+ unresolved_reloc = FALSE;
+ }
+ else
+ {
+ unsigned int i;
+ static unsigned char tlsgd[8]
+ = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
+
+ /* GD->IE transition.
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@plt
+ Change it into:
+ movq %fs:0, %rax
+ addq foo@gottpoff(%rip), %rax */
+ BFD_ASSERT (rel->r_offset >= 4);
+ for (i = 0; i < 4; i++)
+ BFD_ASSERT (bfd_get_8 (input_bfd,
+ contents + rel->r_offset - 4 + i)
+ == tlsgd[i]);
+ BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
+ for (i = 0; i < 4; i++)
+ BFD_ASSERT (bfd_get_8 (input_bfd,
+ contents + rel->r_offset + 4 + i)
+ == tlsgd[i+4]);
+ BFD_ASSERT (rel + 1 < relend);
+ BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
+ memcpy (contents + rel->r_offset - 4,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
+ 16);
+
+ relocation = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off
+ - rel->r_offset
+ - input_section->output_section->vma
+ - input_section->output_offset
+ - 12);
+ bfd_put_32 (output_bfd, relocation,
+ contents + rel->r_offset + 8);
+ /* Skip R_X86_64_PLT32. */
+ rel++;
+ continue;
+ }
+ break;
+
+ case R_X86_64_TLSLD:
+ if (! info->shared)
+ {
+ /* LD->LE transition:
+ Ensure it is:
+ leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt.
+ We change it into:
+ .word 0x6666; .byte 0x66; movl %fs:0, %rax. */
+ BFD_ASSERT (rel->r_offset >= 3);
+ BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3)
+ == 0x48);
+ BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
+ == 0x8d);
+ BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1)
+ == 0x3d);
+ BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
+ BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
+ == 0xe8);
+ BFD_ASSERT (rel + 1 < relend);
+ BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
+ memcpy (contents + rel->r_offset - 3,
+ "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
+ /* Skip R_X86_64_PLT32. */
+ rel++;
+ continue;
+ }
+
+ if (htab->sgot == NULL)
+ abort ();
+
+ off = htab->tls_ld_got.offset;
+ if (off & 1)
+ off &= ~1;
+ else
+ {
+ Elf_Internal_Rela outrel;
+ bfd_byte *loc;
+
+ if (htab->srelgot == NULL)
+ abort ();
+
+ outrel.r_offset = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off);
+
+ bfd_put_64 (output_bfd, 0,
+ htab->sgot->contents + off);
+ bfd_put_64 (output_bfd, 0,
+ htab->sgot->contents + off + GOT_ENTRY_SIZE);
+ outrel.r_info = ELF64_R_INFO (0, R_X86_64_DTPMOD64);
+ outrel.r_addend = 0;
+ loc = htab->srelgot->contents;
+ loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
+ htab->tls_ld_got.offset |= 1;
+ }
+ relocation = htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off;
+ unresolved_reloc = FALSE;
+ break;
+
+ case R_X86_64_DTPOFF32:
+ if (info->shared || (input_section->flags & SEC_CODE) == 0)
+ relocation -= dtpoff_base (info);
+ else
+ relocation = tpoff (info, relocation);
+ break;
+
+ case R_X86_64_TPOFF32:
+ BFD_ASSERT (! info->shared);
+ relocation = tpoff (info, relocation);
+ break;
+
default:
break;
}
+ /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
+ because such sections are not SEC_ALLOC and thus ld.so will
+ not process them. */
+ if (unresolved_reloc
+ && !((input_section->flags & SEC_DEBUGGING) != 0
+ && h->def_dynamic))
+ (*_bfd_error_handler)
+ (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
+ input_bfd,
+ input_section,
+ (long) rel->r_offset,
+ h->root.root.string);
+
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rela->r_offset,
- relocation, rela->r_addend);
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
if (r != bfd_reloc_ok)
{
- switch (r)
+ const char *name;
+
+ if (h != NULL)
+ name = h->root.root.string;
+ else
{
- default:
- case bfd_reloc_outofrange:
- abort ();
- case bfd_reloc_overflow:
- {
- const char *name;
+ name = bfd_elf_string_from_elf_section (input_bfd,
+ symtab_hdr->sh_link,
+ sym->st_name);
+ if (name == NULL)
+ return FALSE;
+ if (*name == '\0')
+ name = bfd_section_name (input_bfd, sec);
+ }
- if (h != NULL)
- name = h->root.root.string;
- else
- {
- name = bfd_elf_string_from_elf_section (input_bfd,
- symtab_hdr->sh_link,
- sym->st_name);
- if (name == NULL)
- return false;
- if (*name == '\0')
- name = bfd_section_name (input_bfd, sec);
- }
- if (! ((*info->callbacks->reloc_overflow)
- (info, name, howto->name, (bfd_vma) 0,
- input_bfd, input_section, rela->r_offset)))
- return false;
- }
- break;
+ if (r == bfd_reloc_overflow)
+ {
+ if (h != NULL
+ && h->root.type == bfd_link_hash_undefweak
+ && howto->pc_relative)
+ /* Ignore reloc overflow on branches to undefweak syms. */
+ continue;
+
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section,
+ rel->r_offset)))
+ return FALSE;
+ }
+ else
+ {
+ (*_bfd_error_handler)
+ (_("%B(%A+0x%lx): reloc against `%s': error %d"),
+ input_bfd, input_section,
+ (long) rel->r_offset, name, (int) r);
+ return FALSE;
}
}
}
- return true;
+ return TRUE;
}
/* Finish up dynamic symbol handling. We set the contents of various
dynamic sections here. */
-static boolean
-elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
- bfd *output_bfd;
- struct bfd_link_info *info;
- struct elf_link_hash_entry *h;
- Elf_Internal_Sym *sym;
+static bfd_boolean
+elf64_x86_64_finish_dynamic_symbol (bfd *output_bfd,
+ struct bfd_link_info *info,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym)
{
- bfd *dynobj;
+ struct elf64_x86_64_link_hash_table *htab;
- dynobj = elf_hash_table (info)->dynobj;
+ htab = elf64_x86_64_hash_table (info);
if (h->plt.offset != (bfd_vma) -1)
{
- asection *splt;
- asection *sgot;
- asection *srela;
bfd_vma plt_index;
bfd_vma got_offset;
Elf_Internal_Rela rela;
+ bfd_byte *loc;
/* This symbol has an entry in the procedure linkage table. Set
- it up. */
-
- BFD_ASSERT (h->dynindx != -1);
-
- splt = bfd_get_section_by_name (dynobj, ".plt");
- sgot = bfd_get_section_by_name (dynobj, ".got.plt");
- srela = bfd_get_section_by_name (dynobj, ".rela.plt");
- BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);
+ it up. */
+ if (h->dynindx == -1
+ || htab->splt == NULL
+ || htab->sgotplt == NULL
+ || htab->srelplt == NULL)
+ abort ();
/* Get the index in the procedure linkage table which
corresponds to this symbol. This is the index of this symbol
plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
/* Get the offset into the .got table of the entry that
- corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
- bytes. The first three are reserved. */
+ corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
+ bytes. The first three are reserved for the dynamic linker. */
got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
/* Fill in the entry in the procedure linkage table. */
- memcpy (splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
+ memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry,
PLT_ENTRY_SIZE);
/* Insert the relocation positions of the plt section. The magic
numbers at the end of the statements are the positions of the
relocations in the plt section. */
- bfd_put_64 (output_bfd, got_offset, splt->contents + h->plt.offset + 2);
- bfd_put_64 (output_bfd, plt_index * sizeof (Elf64_External_Rela),
- splt->contents + h->plt.offset + 7);
- bfd_put_64 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
- splt->contents + h->plt.offset + 12);
-
- /* Fill in the entry in the global offset table. */
- bfd_put_64 (output_bfd, (splt->output_section->vma + splt->output_offset
+ /* Put offset for jmp *name@GOTPCREL(%rip), since the
+ instruction uses 6 bytes, subtract this value. */
+ bfd_put_32 (output_bfd,
+ (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ + got_offset
+ - htab->splt->output_section->vma
+ - htab->splt->output_offset
+ - h->plt.offset
+ - 6),
+ htab->splt->contents + h->plt.offset + 2);
+ /* Put relocation index. */
+ bfd_put_32 (output_bfd, plt_index,
+ htab->splt->contents + h->plt.offset + 7);
+ /* Put offset for jmp .PLT0. */
+ bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
+ htab->splt->contents + h->plt.offset + 12);
+
+ /* Fill in the entry in the global offset table, initially this
+ points to the pushq instruction in the PLT which is at offset 6. */
+ bfd_put_64 (output_bfd, (htab->splt->output_section->vma
+ + htab->splt->output_offset
+ h->plt.offset + 6),
- sgot->contents + got_offset);
+ htab->sgotplt->contents + got_offset);
/* Fill in the entry in the .rela.plt section. */
- rela.r_offset = (sgot->output_section->vma
- + sgot->output_offset
+ rela.r_offset = (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ got_offset);
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT);
rela.r_addend = 0;
- bfd_elf64_swap_reloca_out (output_bfd, &rela,
- ((Elf64_External_Rela *) srela->contents
- + plt_index));
+ loc = htab->srelplt->contents + plt_index * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
- if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ if (!h->def_regular)
{
/* Mark the symbol as undefined, rather than as defined in
- the .plt section. Leave the value alone. */
+ the .plt section. Leave the value if there were any
+ relocations where pointer equality matters (this is a clue
+ for the dynamic linker, to make function pointer
+ comparisons work between an application and shared
+ library), otherwise set it to zero. If a function is only
+ called from a binary, there is no need to slow down
+ shared libraries because of that. */
sym->st_shndx = SHN_UNDEF;
+ if (!h->pointer_equality_needed)
+ sym->st_value = 0;
}
}
- if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
+ if (h->got.offset != (bfd_vma) -1
+ && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_GD
+ && elf64_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
{
- asection *s;
Elf_Internal_Rela rela;
+ bfd_byte *loc;
+
+ /* This symbol has an entry in the global offset table. Set it
+ up. */
+ if (htab->sgot == NULL || htab->srelgot == NULL)
+ abort ();
+
+ rela.r_offset = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset
+ + (h->got.offset &~ (bfd_vma) 1));
+
+ /* If this is a static link, or it is a -Bsymbolic link and the
+ symbol is defined locally or was forced to be local because
+ of a version file, we just want to emit a RELATIVE reloc.
+ The entry in the global offset table will already have been
+ initialized in the relocate_section function. */
+ if (info->shared
+ && SYMBOL_REFERENCES_LOCAL (info, h))
+ {
+ BFD_ASSERT((h->got.offset & 1) != 0);
+ rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
+ rela.r_addend = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ }
+ else
+ {
+ BFD_ASSERT((h->got.offset & 1) == 0);
+ bfd_put_64 (output_bfd, (bfd_vma) 0,
+ htab->sgot->contents + h->got.offset);
+ rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT);
+ rela.r_addend = 0;
+ }
- /* This symbol needs a copy reloc. Set it up. */
+ loc = htab->srelgot->contents;
+ loc += htab->srelgot->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
+ }
+
+ if (h->needs_copy)
+ {
+ Elf_Internal_Rela rela;
+ bfd_byte *loc;
- BFD_ASSERT (h->dynindx != -1
- && (h->root.type == bfd_link_hash_defined
- || h->root.type == bfd_link_hash_defweak));
+ /* This symbol needs a copy reloc. Set it up. */
- s = bfd_get_section_by_name (h->root.u.def.section->owner,
- ".rela.bss");
- BFD_ASSERT (s != NULL);
+ if (h->dynindx == -1
+ || (h->root.type != bfd_link_hash_defined
+ && h->root.type != bfd_link_hash_defweak)
+ || htab->srelbss == NULL)
+ abort ();
rela.r_offset = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY);
rela.r_addend = 0;
- bfd_elf64_swap_reloca_out (output_bfd, &rela,
- ((Elf64_External_Rela *) s->contents
- + s->reloc_count));
- ++s->reloc_count;
+ loc = htab->srelbss->contents;
+ loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
}
/* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
|| strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
sym->st_shndx = SHN_ABS;
- return true;
+ return TRUE;
+}
+
+/* Used to decide how to sort relocs in an optimal manner for the
+ dynamic linker, before writing them out. */
+
+static enum elf_reloc_type_class
+elf64_x86_64_reloc_type_class (const Elf_Internal_Rela *rela)
+{
+ switch ((int) ELF64_R_TYPE (rela->r_info))
+ {
+ case R_X86_64_RELATIVE:
+ return reloc_class_relative;
+ case R_X86_64_JUMP_SLOT:
+ return reloc_class_plt;
+ case R_X86_64_COPY:
+ return reloc_class_copy;
+ default:
+ return reloc_class_normal;
+ }
}
/* Finish up the dynamic sections. */
-static boolean
-elf64_x86_64_finish_dynamic_sections (output_bfd, info)
- bfd *output_bfd;
- struct bfd_link_info *info;
+static bfd_boolean
+elf64_x86_64_finish_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
{
+ struct elf64_x86_64_link_hash_table *htab;
bfd *dynobj;
asection *sdyn;
- asection *sgot;
-
- dynobj = elf_hash_table (info)->dynobj;
+ htab = elf64_x86_64_hash_table (info);
+ dynobj = htab->elf.dynobj;
sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
- if (elf_hash_table (info)->dynamic_sections_created)
+ if (htab->elf.dynamic_sections_created)
{
- asection *splt;
Elf64_External_Dyn *dyncon, *dynconend;
- splt = bfd_get_section_by_name (dynobj, ".plt");
- BFD_ASSERT (splt != NULL && sdyn != NULL);
+ if (sdyn == NULL || htab->sgot == NULL)
+ abort ();
dyncon = (Elf64_External_Dyn *) sdyn->contents;
- dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
+ dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->size);
for (; dyncon < dynconend; dyncon++)
{
Elf_Internal_Dyn dyn;
- const char *name;
asection *s;
bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
switch (dyn.d_tag)
{
default:
- break;
+ continue;
case DT_PLTGOT:
- name = ".got";
- goto get_vma;
+ s = htab->sgotplt;
+ dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
+ break;
case DT_JMPREL:
- name = ".rela.plt";
+ dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
+ break;
- get_vma:
- s = bfd_get_section_by_name (output_bfd, name);
- BFD_ASSERT (s != NULL);
- dyn.d_un.d_ptr = s->vma;
+ case DT_PLTRELSZ:
+ s = htab->srelplt->output_section;
+ dyn.d_un.d_val = s->size;
break;
case DT_RELASZ:
- /* FIXME: This comment and code is from elf64-alpha.c: */
- /* My interpretation of the TIS v1.1 ELF document indicates
- that RELASZ should not include JMPREL. This is not what
- the rest of the BFD does. It is, however, what the
- glibc ld.so wants. Do this fixup here until we found
- out who is right. */
- s = bfd_get_section_by_name (output_bfd, ".rela.plt");
- if (s)
+ /* The procedure linkage table relocs (DT_JMPREL) should
+ not be included in the overall relocs (DT_RELA).
+ Therefore, we override the DT_RELASZ entry here to
+ make it not include the JMPREL relocs. Since the
+ linker script arranges for .rela.plt to follow all
+ other relocation sections, we don't have to worry
+ about changing the DT_RELA entry. */
+ if (htab->srelplt != NULL)
{
- /* Subtract JMPREL size from RELASZ. */
- dyn.d_un.d_val -=
- (s->_cooked_size ? s->_cooked_size : s->_raw_size);
+ s = htab->srelplt->output_section;
+ dyn.d_un.d_val -= s->size;
}
break;
-
- case DT_PLTRELSZ:
- s = bfd_get_section_by_name (output_bfd, ".rela.plt");
- BFD_ASSERT (s != NULL);
- dyn.d_un.d_val =
- (s->_cooked_size != 0 ? s->_cooked_size : s->_raw_size);
- break;
}
bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
}
- /* Initialize the contents of the .plt section. */
- if (splt->_raw_size > 0)
+ /* Fill in the special first entry in the procedure linkage table. */
+ if (htab->splt && htab->splt->size > 0)
{
- memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE);
+ /* Fill in the first entry in the procedure linkage table. */
+ memcpy (htab->splt->contents, elf64_x86_64_plt0_entry,
+ PLT_ENTRY_SIZE);
+ /* Add offset for pushq GOT+8(%rip), since the instruction
+ uses 6 bytes subtract this value. */
+ bfd_put_32 (output_bfd,
+ (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ + 8
+ - htab->splt->output_section->vma
+ - htab->splt->output_offset
+ - 6),
+ htab->splt->contents + 2);
+ /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to
+ the end of the instruction. */
+ bfd_put_32 (output_bfd,
+ (htab->sgotplt->output_section->vma
+ + htab->sgotplt->output_offset
+ + 16
+ - htab->splt->output_section->vma
+ - htab->splt->output_offset
+ - 12),
+ htab->splt->contents + 8);
+
+ elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize =
+ PLT_ENTRY_SIZE;
}
-
- elf_section_data (splt->output_section)->this_hdr.sh_entsize =
- PLT_ENTRY_SIZE;
}
- /* Set the first entry in the global offset table to the address of
- the dynamic section. */
- sgot = bfd_get_section_by_name (dynobj, ".got");
- BFD_ASSERT (sgot != NULL);
- if (sgot->_raw_size > 0)
+ if (htab->sgotplt)
{
- if (sdyn == NULL)
- bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents);
- else
- bfd_put_64 (output_bfd,
- sdyn->output_section->vma + sdyn->output_offset,
- sgot->contents);
- /* Write GOT[1] and GOT[2], needed for the linker. */
- bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE);
- bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE*2);
+ /* Fill in the first three entries in the global offset table. */
+ if (htab->sgotplt->size > 0)
+ {
+ /* Set the first entry in the global offset table to the address of
+ the dynamic section. */
+ if (sdyn == NULL)
+ bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents);
+ else
+ bfd_put_64 (output_bfd,
+ sdyn->output_section->vma + sdyn->output_offset,
+ htab->sgotplt->contents);
+ /* Write GOT[1] and GOT[2], needed for the dynamic linker. */
+ bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE);
+ bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2);
+ }
+
+ elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize =
+ GOT_ENTRY_SIZE;
}
- elf_section_data (sgot->output_section)->this_hdr.sh_entsize =
- GOT_ENTRY_SIZE;
+ if (htab->sgot && htab->sgot->size > 0)
+ elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize
+ = GOT_ENTRY_SIZE;
+
+ return TRUE;
+}
+
+/* Return address for Ith PLT stub in section PLT, for relocation REL
+ or (bfd_vma) -1 if it should not be included. */
- return true;
+static bfd_vma
+elf64_x86_64_plt_sym_val (bfd_vma i, const asection *plt,
+ const arelent *rel ATTRIBUTE_UNUSED)
+{
+ return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
}
+/* Handle an x86-64 specific section when reading an object file. This
+ is called when elfcode.h finds a section with an unknown type. */
+
+static bfd_boolean
+elf64_x86_64_section_from_shdr (bfd *abfd,
+ Elf_Internal_Shdr *hdr,
+ const char *name,
+ int shindex)
+{
+ if (hdr->sh_type != SHT_X86_64_UNWIND)
+ return FALSE;
+
+ if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
+ return FALSE;
+
+ return TRUE;
+}
#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
#define TARGET_LITTLE_NAME "elf64-x86-64"
#define ELF_MAXPAGESIZE 0x100000
#define elf_backend_can_gc_sections 1
+#define elf_backend_can_refcount 1
#define elf_backend_want_got_plt 1
#define elf_backend_plt_readonly 1
#define elf_backend_want_plt_sym 0
#define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
-#define elf_backend_plt_header_size PLT_ENTRY_SIZE
+#define elf_backend_rela_normal 1
#define elf_info_to_howto elf64_x86_64_info_to_howto
-#define elf_backend_object_p elf64_x86_64_elf_object_p
-#define elf_backend_relocate_section elf64_x86_64_relocate_section
-#define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link
#define bfd_elf64_bfd_link_hash_table_create \
elf64_x86_64_link_hash_table_create
-#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
+#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
#define elf_backend_check_relocs elf64_x86_64_check_relocs
-#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
-#define elf_backend_finish_dynamic_sections \
- elf64_x86_64_finish_dynamic_sections
+#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol
+#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections
+#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol
#define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook
#define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook
+#define elf_backend_grok_prstatus elf64_x86_64_grok_prstatus
+#define elf_backend_grok_psinfo elf64_x86_64_grok_psinfo
+#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
#define elf_backend_relocate_section elf64_x86_64_relocate_section
#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
+#define elf_backend_plt_sym_val elf64_x86_64_plt_sym_val
+#define elf_backend_object_p elf64_x86_64_elf_object_p
+#define bfd_elf64_mkobject elf64_x86_64_mkobject
+
+#define elf_backend_section_from_shdr \
+ elf64_x86_64_section_from_shdr
#include "elf64-target.h"
projects / deliverable / binutils-gdb.git / blobdiff