/* X86-64 specific support for 64-bit ELF
- Copyright 2000 Free Software Foundation, Inc.
+ Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
This file is part of BFD, the Binary File Descriptor library.
#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 */
-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),
+ 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,
+ 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, 4, 32, true, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_PC32", false, 0xffffffff, 0xffffffff,
+ true),
+ HOWTO(R_X86_64_GOT32, 0, 4, 32, false, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOT32", false, 0xffffffff, 0xffffffff,
+ false),
+ HOWTO(R_X86_64_PLT32, 0, 4, 32, true, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_PLT32", false, 0xffffffff, 0xffffffff,
+ true),
+ HOWTO(R_X86_64_COPY, 0, 4, 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, 4, 32, true,0 , complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", false, 0xffffffff,
+ 0xffffffff, true),
+ HOWTO(R_X86_64_32, 0, 4, 32, false, 0, complain_overflow_unsigned,
+ bfd_elf_generic_reloc, "R_X86_64_32", false, 0xffffffff, 0xffffffff,
+ false),
+ HOWTO(R_X86_64_32S, 0, 4, 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),
+
+/* 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. */
-struct elf_reloc_map {
+struct elf_reloc_map
+{
bfd_reloc_code_real_type bfd_reloc_val;
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_32_PCREL, R_X86_64_PC32, },
- { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
- { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
- { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
- { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
- { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
- { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
- { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
- { BFD_RELOC_32, R_X86_64_32, },
- { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
- { BFD_RELOC_16, R_X86_64_16, },
- { 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_NONE, R_X86_64_NONE, },
+ { BFD_RELOC_64, R_X86_64_64, },
+ { BFD_RELOC_32_PCREL, R_X86_64_PC32, },
+ { BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
+ { BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
+ { BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
+ { BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
+ { BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
+ { BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
+ { BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
+ { BFD_RELOC_32, R_X86_64_32, },
+ { BFD_RELOC_X86_64_32S, R_X86_64_32S, },
+ { BFD_RELOC_16, R_X86_64_16, },
+ { 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_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 boolean elf64_x86_64_grok_prstatus
+ PARAMS ((bfd *, Elf_Internal_Note *));
+static boolean elf64_x86_64_grok_psinfo
+ PARAMS ((bfd *, Elf_Internal_Note *));
static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create
PARAMS ((bfd *));
+static boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd));
+static boolean create_got_section
+ PARAMS((bfd *, struct bfd_link_info *));
+static boolean elf64_x86_64_create_dynamic_sections
+ PARAMS((bfd *, struct bfd_link_info *));
+static void elf64_x86_64_copy_indirect_symbol
+ PARAMS ((struct elf_backend_data *, struct elf_link_hash_entry *,
+ struct elf_link_hash_entry *));
+static boolean elf64_x86_64_check_relocs
+ PARAMS ((bfd *, struct bfd_link_info *, asection *sec,
+ const Elf_Internal_Rela *));
+static asection *elf64_x86_64_gc_mark_hook
+ PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
+ struct elf_link_hash_entry *, Elf_Internal_Sym *));
+
+static boolean elf64_x86_64_gc_sweep_hook
+ PARAMS ((bfd *, struct bfd_link_info *, asection *,
+ const Elf_Internal_Rela *));
+
+static struct bfd_hash_entry *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 allocate_dynrelocs
+ PARAMS ((struct elf_link_hash_entry *, PTR));
+static boolean readonly_dynrelocs
+ PARAMS ((struct elf_link_hash_entry *, PTR));
+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 **));
+ 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 *));
+static enum elf_reloc_type_class elf64_x86_64_reloc_type_class
+ PARAMS ((const Elf_Internal_Rela *));
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
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;
}
arelent *cache_ptr;
Elf64_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_PC8);
+ 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_PC8 - 1);
+ }
+ cache_ptr->howto = &x86_64_elf_howto_table[i];
BFD_ASSERT (r_type == cache_ptr->howto->type);
}
+\f
+/* Support for core dump NOTE sections. */
+static boolean
+elf64_x86_64_grok_prstatus (abfd, note)
+ bfd *abfd;
+ Elf_Internal_Note *note;
+{
+ int offset;
+ size_t raw_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;
+ raw_size = 216;
+
+ break;
+ }
+
+ /* Make a ".reg/999" section. */
+ return _bfd_elfcore_make_pseudosection (abfd, ".reg",
+ raw_size, note->descpos + offset);
+}
+
+static boolean
+elf64_x86_64_grok_psinfo (abfd, note)
+ 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
+ section. */
+
+#define ELF_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
+
+/* The size in bytes of an entry in the global offset table. */
+
+#define GOT_ENTRY_SIZE 8
+
+/* The size in bytes of an entry in the procedure linkage table. */
+
+#define PLT_ENTRY_SIZE 16
+
+/* The first entry in a procedure linkage table looks like this. See the
+ SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
+
+static const bfd_byte elf64_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
+{
+ 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, 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 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_dyn_relocs
+{
+ /* Next 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 elf;
+
+ /* Track dynamic relocs copied for this symbol. */
+ struct elf64_x86_64_dyn_relocs *dyn_relocs;
+};
+
+/* x86-64 ELF linker hash table. */
-/* Hash table functions - these will be used by dynamic linking code and
- right now they are needed to keep ld happy. */
+struct elf64_x86_64_link_hash_table
+{
+ struct elf_link_hash_table elf;
-/* x86_64 ELF linker hash table. */
+ /* Short-cuts to get to dynamic linker sections. */
+ asection *sgot;
+ asection *sgotplt;
+ asection *srelgot;
+ asection *splt;
+ asection *srelplt;
+ asection *sdynbss;
+ asection *srelbss;
-struct elf64_x86_64_link_hash_table {
- struct elf_link_hash_table root;
+ /* 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. */
+/* 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. */
+
+static struct bfd_hash_entry *
+link_hash_newfunc (entry, table, string)
+ struct bfd_hash_entry *entry;
+ struct bfd_hash_table *table;
+ const char *string;
+{
+ /* Allocate the structure if it has not already been allocated by a
+ subclass. */
+ 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. */
+ entry = _bfd_elf_link_hash_newfunc (entry, table, string);
+ if (entry != NULL)
+ {
+ struct elf64_x86_64_link_hash_entry *eh;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) entry;
+ eh->dyn_relocs = NULL;
+ }
+
+ return entry;
+}
+
/* Create an X86-64 ELF linker hash table. */
static struct bfd_link_hash_table *
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,
- _bfd_elf_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;
+
+ return &ret->elf.root;
+}
+
+/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
+ shortcuts to them in our hash table. */
+
+static boolean
+create_got_section (dynobj, info)
+ 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 boolean
+elf64_x86_64_create_dynamic_sections (dynobj, info)
+ 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 (bed, dir, ind)
+ struct elf_backend_data *bed;
+ struct elf_link_hash_entry *dir, *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;
+ }
+
+ _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
}
-boolean
+static boolean
elf64_x86_64_elf_object_p (abfd)
bfd *abfd;
{
return true;
}
-/* Relocate an x86_64 ELF section. */
+/* Look through the relocs for a section during the first phase, and
+ calculate needed space in the global offset table, procedure
+ linkage table, and dynamic reloc sections. */
static boolean
-elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
- contents, relocs, local_syms, local_sections)
- bfd *output_bfd;
+elf64_x86_64_check_relocs (abfd, info, sec, relocs)
+ bfd *abfd;
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;
+ 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_vma *local_got_offsets;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
asection *sreloc;
- Elf_Internal_Rela *rel;
- Elf_Internal_Rela *relend;
- dynobj = elf_hash_table (info)->dynobj;
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
- sym_hashes = elf_sym_hashes (input_bfd);
- local_got_offsets = elf_local_got_offsets (input_bfd);
+ if (info->relocateable)
+ return true;
+
+ htab = elf64_x86_64_hash_table (info);
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
- if (dynobj != NULL)
- abort ();
- rel = relocs;
- relend = relocs + input_section->reloc_count;
- for (; rel < relend; rel++)
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
{
- 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 relocation;
- bfd_reloc_status_type r;
- unsigned int indx;
- r_type = ELF64_R_TYPE (rel->r_info);
+ r_symndx = ELF64_R_SYM (rel->r_info);
- if ((indx = (unsigned) r_type) >= R_X86_64_max)
+ if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
- bfd_set_error (bfd_error_bad_value);
+ (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
+ bfd_archive_filename (abfd),
+ r_symndx);
return false;
}
- howto = x86_64_elf_howto_table + indx;
- r_symndx = ELF64_R_SYM (rel->r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- if (info->relocateable)
+ switch (ELF64_R_TYPE (rel->r_info))
{
- /* 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)
+ case R_X86_64_GOT32:
+ case R_X86_64_GOTPCREL:
+ /* This symbol requires a global offset table entry. */
+ if (h != NULL)
{
- sym = local_syms + r_symndx;
- if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
+ h->got.refcount += 1;
+ }
+ else
+ {
+ bfd_signed_vma *local_got_refcounts;
+
+ /* This is a global offset table entry for a local symbol. */
+ local_got_refcounts = elf_local_got_refcounts (abfd);
+ if (local_got_refcounts == NULL)
{
- sec = local_sections[r_symndx];
- rel->r_addend += sec->output_offset + sym->st_value;
+ bfd_size_type size;
+
+ size = symtab_hdr->sh_info;
+ size *= sizeof (bfd_signed_vma);
+ 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;
}
+ local_got_refcounts[r_symndx] += 1;
}
+ /* Fall through */
- continue;
- }
+ //case R_X86_64_GOTPCREL:
+ if (htab->sgot == NULL)
+ {
+ if (htab->elf.dynobj == NULL)
+ htab->elf.dynobj = abfd;
+ if (!create_got_section (htab->elf.dynobj, info))
+ return false;
+ }
+ break;
- /* This is a final link. */
- h = NULL;
- sym = NULL;
- sec = NULL;
- 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);
- }
- 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)
+ 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. */
+
+ /* If this is a local symbol, we resolve it directly without
+ creating a procedure linkage table entry. */
+ if (h == NULL)
+ continue;
+
+ h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
+ 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)
{
- sec = h->root.u.def.section;
- if (sec->output_section == NULL)
+ (*_bfd_error_handler)
+ (_("%s: relocation %s can not be used when making a shared object; recompile with -fPIC"),
+ bfd_archive_filename (abfd),
+ x86_64_elf_howto_table[ELF64_R_TYPE (rel->r_info)].name);
+ 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:
+ 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->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
+
+ /* We may need a .plt entry if the function this reloc
+ refers to is in a shared lib. */
+ h->plt.refcount += 1;
+ }
+
+ /* If we are creating a shared library, and this is a reloc
+ against a global symbol, or a non PC relative reloc
+ against a local symbol, then we need to copy the 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
+ 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). 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
+ && (((ELF64_R_TYPE (rel->r_info) != R_X86_64_PC8)
+ && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16)
+ && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32))
+ || (h != NULL
+ && (! info->symbolic
+ || h->root.type == bfd_link_hash_defweak
+ || (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0))))
+ || (!info->shared
+ && (sec->flags & SEC_ALLOC) != 0
+ && h != NULL
+ && (h->root.type == bfd_link_hash_defweak
+ || (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0)))
+ {
+ 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)
{
- (*_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;
+ 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;
+
+ if (strncmp (name, ".rela", 5) != 0
+ || strcmp (bfd_get_section_name (abfd, sec),
+ name + 5) != 0)
+ {
+ (*_bfd_error_handler)
+ (_("%s: bad relocation section name `%s\'"),
+ bfd_archive_filename (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)
+ {
+ flagword flags;
+
+ sreloc = bfd_make_section (dynobj, name);
+ flags = (SEC_HAS_CONTENTS | SEC_READONLY
+ | SEC_IN_MEMORY | SEC_LINKER_CREATED);
+ if ((sec->flags & SEC_ALLOC) != 0)
+ flags |= SEC_ALLOC | SEC_LOAD;
+ if (sreloc == NULL
+ || ! bfd_set_section_flags (dynobj, sreloc, flags)
+ || ! bfd_set_section_alignment (dynobj, sreloc, 3))
+ return false;
+ }
+ elf_section_data (sec)->sreloc = sreloc;
+ }
+
+ /* 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
- 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->callbacks->undefined_symbol)
- (info, h->root.root.string, input_bfd,
- input_section, rel->r_offset,
- (!info->shared || info->no_undefined
- || ELF_ST_VISIBILITY (h->other)))))
- return false;
- relocation = 0;
+ {
+ /* 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);
+ }
+
+ p = *head;
+ if (p == NULL || p->sec != sec)
+ {
+ 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;
+ }
+
+ p->count += 1;
+ if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8
+ || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16
+ || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
+ p->pc_count += 1;
}
+ break;
+
+ /* This relocation describes the C++ object vtable hierarchy.
+ Reconstruct it for later use during GC. */
+ case R_X86_64_GNU_VTINHERIT:
+ if (!_bfd_elf64_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
+ return false;
+ break;
+
+ /* This relocation describes which C++ vtable entries are actually
+ used. Record for later use during GC. */
+ case R_X86_64_GNU_VTENTRY:
+ if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return false;
+ break;
+
+ default:
+ break;
}
- /* This function should support shared objects, but don't. */
- if (info->shared)
- abort ();
+ }
- r = _bfd_final_link_relocate (howto, input_bfd, input_section,
- contents, rel->r_offset,
- relocation, rel->r_addend);
+ return true;
+}
- if (r != bfd_reloc_ok)
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
+static asection *
+elf64_x86_64_gc_mark_hook (sec, info, rel, h, sym)
+ 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 (ELF64_R_TYPE (rel->r_info))
{
- switch (r)
+ case R_X86_64_GNU_VTINHERIT:
+ case R_X86_64_GNU_VTENTRY:
+ break;
+
+ default:
+ switch (h->root.type)
{
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
default:
- case bfd_reloc_outofrange:
- abort ();
- case bfd_reloc_overflow:
- {
- const char *name;
-
- 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, rel->r_offset)))
- return false;
- }
break;
}
}
}
- return true;
+ else
+ return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+
+ return NULL;
}
-#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
-#define TARGET_LITTLE_NAME "elf64-x86-64"
-#define ELF_ARCH bfd_arch_i386
-#define ELF_MACHINE_CODE EM_X86_64
-#define ELF_MAXPAGESIZE 0x100000
-#define elf_info_to_howto elf64_x86_64_info_to_howto
-#define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup
-#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_link_hash_table_create elf64_x86_64_link_hash_table_create
+/* 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;
+ 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;
+
+ 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);
+
+ 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)
+ h->got.refcount -= 1;
+ }
+ else if (local_got_refcounts != NULL)
+ {
+ if (local_got_refcounts[r_symndx] > 0)
+ local_got_refcounts[r_symndx] -= 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:
+ 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];
+
+ if (!info->shared && h->plt.refcount > 0)
+ h->plt.refcount -= 1;
+
+ eh = (struct elf64_x86_64_link_hash_entry *) h;
+
+ for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
+ if (p->sec == sec)
+ {
+ if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8
+ || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16
+ || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32)
+ p->pc_count -= 1;
+ p->count -= 1;
+ if (p->count == 0)
+ *pp = p->next;
+ 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;
+
+ default:
+ break;
+ }
+
+ return true;
+}
+
+/* Adjust a symbol defined by a dynamic object and referenced by a
+ regular object. The current definition is in some section of the
+ dynamic object, but we're not including those sections. We have to
+ change the definition to something the rest of the link can
+ understand. */
+
+static boolean
+elf64_x86_64_adjust_dynamic_symbol (info, h)
+ struct bfd_link_info *info;
+ struct elf_link_hash_entry *h;
+{
+ struct elf64_x86_64_link_hash_table *htab;
+ struct elf64_x86_64_link_hash_entry * eh;
+ struct elf64_x86_64_dyn_relocs *p;
+ asection *s;
+ unsigned int power_of_two;
+
+ /* If this is a function, put it in the procedure linkage table. We
+ will fill in the contents of the procedure linkage table later,
+ when we know the address of the .got section. */
+ if (h->type == STT_FUNC
+ || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
+ {
+ if (h->plt.refcount <= 0
+ || (! info->shared
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
+ && h->root.type != bfd_link_hash_undefweak
+ && h->root.type != bfd_link_hash_undefined))
+ {
+ /* 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. */
+ h->plt.offset = (bfd_vma) -1;
+ h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
+ }
+
+ 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)
+ {
+ BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
+ || h->weakdef->root.type == bfd_link_hash_defweak);
+ h->root.u.def.section = h->weakdef->root.u.def.section;
+ h->root.u.def.value = h->weakdef->root.u.def.value;
+ return true;
+ }
+
+ /* This is a reference to a symbol defined by a dynamic object which
+ is not a function. */
+
+ /* If we are creating a shared library, we must presume that the
+ only references to the symbol are via the global offset table.
+ For such cases we need not do anything here; the relocations will
+ be handled correctly by relocate_section. */
+ if (info->shared)
+ return true;
+
+ /* If there are no references to this symbol that do not use the
+ GOT, we don't need to generate a copy reloc. */
+ if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
+ return true;
+
+ /* If -z nocopyreloc was given, we won't generate them either. */
+ if (info->nocopyreloc)
+ {
+ h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
+ return true;
+ }
+
+ 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->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
+ return true;
+ }
+
+ /* We must allocate the symbol in our .dynbss section, which will
+ become part of the .bss section of the executable. There will be
+ an entry for this symbol in the .dynsym section. The dynamic
+ object will contain position independent code, so all references
+ from the dynamic object to this symbol will go through the global
+ offset table. The dynamic linker will use the .dynsym entry to
+ determine the address it must put in the global offset table, so
+ both the dynamic object and the regular object will refer to the
+ same memory location for the variable. */
+
+ 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. */
+ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
+ {
+ htab->srelbss->_raw_size += sizeof (Elf64_External_Rela);
+ h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
+ }
+
+ /* We need to figure out the alignment required for this symbol. I
+ have no idea how ELF linkers handle this. 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 = bfd_log2 (h->size);
+ if (power_of_two > 4)
+ power_of_two = 4;
+
+ /* Apply the required alignment. */
+ s = htab->sdynbss;
+ s->_raw_size = BFD_ALIGN (s->_raw_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 (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;
+
+ /* Increment the section size to make room for the symbol. */
+ s->_raw_size += h->size;
+
+ return true;
+}
+
+/* This is the condition under which elf64_x86_64_finish_dynamic_symbol
+ will be called from elflink.h. If elflink.h doesn't call our
+ finish_dynamic_symbol routine, we'll need to do something about
+ initializing any .plt and .got entries in elf64_x86_64_relocate_section. */
+#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \
+ ((DYN) \
+ && ((INFO)->shared \
+ || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
+ && ((H)->dynindx != -1 \
+ || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
+
+/* Allocate space in .plt, .got and associated reloc sections for
+ dynamic relocs. */
+
+static boolean
+allocate_dynrelocs (h, inf)
+ struct elf_link_hash_entry *h;
+ PTR 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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
+ {
+ if (! bfd_elf64_link_record_dynamic_symbol (info, h))
+ return false;
+ }
+
+ if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h))
+ {
+ asection *s = htab->splt;
+
+ /* 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;
+
+ h->plt.offset = s->_raw_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 = h->plt.offset;
+ }
+
+ /* Make room for this entry. */
+ s->_raw_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->_raw_size += GOT_ENTRY_SIZE;
+
+ /* We also need to make an entry in the .rela.plt section. */
+ htab->srelplt->_raw_size += sizeof (Elf64_External_Rela);
+ }
+ else
+ {
+ h->plt.offset = (bfd_vma) -1;
+ h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
+ }
+ }
+ else
+ {
+ h->plt.offset = (bfd_vma) -1;
+ h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
+ }
+
+ if (h->got.refcount > 0)
+ {
+ asection *s;
+ boolean dyn;
+
+ /* 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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
+ {
+ if (! bfd_elf64_link_record_dynamic_symbol (info, h))
+ return false;
+ }
+
+ s = htab->sgot;
+ h->got.offset = s->_raw_size;
+ s->_raw_size += GOT_ENTRY_SIZE;
+ dyn = htab->elf.dynamic_sections_created;
+ if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h))
+ htab->srelgot->_raw_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)
+ {
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
+ && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0
+ || info->symbolic))
+ {
+ 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;
+ }
+ }
+ }
+ else
+ {
+ /* For the non-shared case, discard space for relocs against
+ symbols which turn out to need copy relocs or are not
+ dynamic. */
+
+ if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
+ && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ || (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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
+ {
+ if (! bfd_elf64_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->_raw_size += p->count * sizeof (Elf64_External_Rela);
+ }
+
+ return true;
+}
+
+/* Find any dynamic relocs that apply to read-only sections. */
+
+static boolean
+readonly_dynrelocs (h, inf)
+ struct elf_link_hash_entry *h;
+ PTR 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 ATTRIBUTE_UNUSED;
+ struct bfd_link_info *info;
+{
+ struct elf64_x86_64_link_hash_table *htab;
+ bfd *dynobj;
+ asection *s;
+ boolean relocs;
+ bfd *ibfd;
+
+ htab = elf64_x86_64_hash_table (info);
+ dynobj = htab->elf.dynobj;
+ if (dynobj == NULL)
+ abort ();
+
+ if (htab->elf.dynamic_sections_created)
+ {
+ /* Set the contents of the .interp section to the interpreter. */
+ if (! info->shared)
+ {
+ s = bfd_get_section_by_name (dynobj, ".interp");
+ if (s == NULL)
+ abort ();
+ s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
+ }
+ }
+
+ /* Set up .got offsets for local syms, and space for local dynamic
+ relocs. */
+ for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
+ {
+ bfd_signed_vma *local_got;
+ bfd_signed_vma *end_local_got;
+ 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->_raw_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;
+ s = htab->sgot;
+ srel = htab->srelgot;
+ for (; local_got < end_local_got; ++local_got)
+ {
+ if (*local_got > 0)
+ {
+ *local_got = s->_raw_size;
+ s->_raw_size += GOT_ENTRY_SIZE;
+ if (info->shared)
+ srel->_raw_size += sizeof (Elf64_External_Rela);
+ }
+ else
+ *local_got = (bfd_vma) -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;
+
+ if (s == htab->splt
+ || s == htab->sgot
+ || s == htab->sgotplt)
+ {
+ /* Strip this section if we don't need it; see the
+ comment below. */
+ }
+ else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
+ {
+ if (s->_raw_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;
+ }
+ else
+ {
+ /* It's not one of our sections, so don't allocate space. */
+ continue;
+ }
+
+ 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. */
+
+ _bfd_strip_section_from_output (info, s);
+ continue;
+ }
+
+ /* Allocate memory for the section contents. We use bfd_zalloc
+ here in case unused entries are not reclaimed before the
+ 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)
+ return false;
+ }
+
+ 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
+ dynamic linker and used by the debugger. */
+#define add_dynamic_entry(TAG, VAL) \
+ bfd_elf64_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
+
+ if (! info->shared)
+ {
+ if (!add_dynamic_entry (DT_DEBUG, 0))
+ return false;
+ }
+
+ if (htab->splt->_raw_size != 0)
+ {
+ 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 (relocs)
+ {
+ 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;
+}
+
+/* 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;
+{
+ 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;
+ Elf_Internal_Rela *rel;
+ Elf_Internal_Rela *relend;
+
+ if (info->relocateable)
+ 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);
+
+ rel = relocs;
+ relend = relocs + input_section->reloc_count;
+ for (; rel < relend; rel++)
+ {
+ 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;
+ boolean unresolved_reloc;
+ bfd_reloc_status_type r;
+
+ 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 (r_type < 0 || r_type >= R_X86_64_max)
+ {
+ bfd_set_error (bfd_error_bad_value);
+ return false;
+ }
+
+ 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 = _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)
+ {
+ /* Set a flag that will be cleared later if we find a
+ relocation value for this symbol. output_section
+ is typically NULL for symbols satisfied by a shared
+ library. */
+ unresolved_reloc = true;
+ 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->allow_shlib_undefined)
+ && !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, rel->r_offset,
+ (!info->shared || info->no_undefined
+ || ELF_ST_VISIBILITY (h->other)))))
+ return false;
+ relocation = 0;
+ }
+ }
+ /* 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. */
+ case R_X86_64_GOTPCREL:
+ /* Use global offset table as symbol value. */
+ if (htab->sgot == NULL)
+ abort ();
+
+ if (h != NULL)
+ {
+ boolean dyn;
+
+ off = h->got.offset;
+ dyn = htab->elf.dynamic_sections_created;
+
+ if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)
+ || (info->shared
+ && (info->symbolic
+ || h->dynindx == -1
+ || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
+ {
+ /* 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
+ 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. */
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ bfd_put_64 (output_bfd, relocation,
+ htab->sgot->contents + off);
+ h->got.offset |= 1;
+ }
+ }
+ else
+ unresolved_reloc = false;
+ }
+ else
+ {
+ 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. */
+ if ((off & 1) != 0)
+ off &= ~1;
+ else
+ {
+ bfd_put_64 (output_bfd, relocation,
+ htab->sgot->contents + off);
+
+ if (info->shared)
+ {
+ asection *srelgot;
+ Elf_Internal_Rela outrel;
+ Elf64_External_Rela *loc;
+
+ /* We need to generate a R_X86_64_RELATIVE reloc
+ for the dynamic linker. */
+ srelgot = htab->srelgot;
+ if (srelgot == NULL)
+ abort ();
+
+ 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;
+ loc = (Elf64_External_Rela *) srelgot->contents;
+ loc += srelgot->reloc_count++;
+ bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc);
+ }
+
+ local_got_offsets[r_symndx] |= 1;
+ }
+ }
+
+ if (off >= (bfd_vma) -2)
+ abort ();
+
+ relocation = htab->sgot->output_offset + off;
+ if (r_type == R_X86_64_GOTPCREL)
+ relocation += htab->sgot->output_section->vma;
+
+ break;
+
+ case R_X86_64_PLT32:
+ /* Relocation is to the entry for this symbol in the
+ procedure linkage table. */
+
+ /* Resolve a PLT32 reloc against a local symbol directly,
+ without using the procedure linkage table. */
+ if (h == NULL)
+ break;
+
+ 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. */
+ break;
+ }
+
+ relocation = (htab->splt->output_section->vma
+ + htab->splt->output_offset
+ + h->plt.offset);
+ unresolved_reloc = false;
+ break;
+
+ case R_X86_64_PC8:
+ case R_X86_64_PC16:
+ case R_X86_64_PC32:
+ 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
+ && ((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))))
+ || (!info->shared
+ && h != NULL
+ && h->dynindx != -1
+ && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
+ && (((h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_DYNAMIC) != 0
+ && (h->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ || h->root.type == bfd_link_hash_undefweak
+ || h->root.type == bfd_link_hash_undefined)))
+ {
+ Elf_Internal_Rela outrel;
+ boolean skip, relocate;
+ asection *sreloc;
+ Elf64_External_Rela *loc;
+
+ /* When generating a shared object, these relocations
+ are copied into the output file to be resolved at run
+ 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->elf_link_hash_flags
+ & ELF_LINK_HASH_DEF_REGULAR) == 0))
+ {
+ outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
+ outrel.r_addend = rel->r_addend;
+ }
+ else
+ {
+ /* This symbol is local, or marked to become local. */
+ if (r_type == R_X86_64_64)
+ {
+ relocate = true;
+ outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE);
+ outrel.r_addend = relocation + rel->r_addend;
+ }
+ else
+ {
+ long sindx;
+
+ if (h == NULL)
+ sec = local_sections[r_symndx];
+ else
+ {
+ BFD_ASSERT (h->root.type == bfd_link_hash_defined
+ || (h->root.type
+ == bfd_link_hash_defweak));
+ sec = h->root.u.def.section;
+ }
+ if (sec != NULL && 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;
+ }
+ }
+
+ sreloc = elf_section_data (input_section)->sreloc;
+ if (sreloc == NULL)
+ abort ();
+
+ loc = (Elf64_External_Rela *) sreloc->contents;
+ loc += sreloc->reloc_count++;
+ 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
+ need to include the symbol value so that it becomes
+ an addend for the dynamic reloc. */
+ if (! relocate)
+ continue;
+ }
+
+ 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->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
+ (*_bfd_error_handler)
+ (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
+ bfd_archive_filename (input_bfd),
+ bfd_get_section_name (input_bfd, input_section),
+ (long) rel->r_offset,
+ h->root.root.string);
+
+ r = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
+
+ if (r != bfd_reloc_ok)
+ {
+ const char *name;
+
+ 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 (r == bfd_reloc_overflow)
+ {
+
+ if (! ((*info->callbacks->reloc_overflow)
+ (info, name, howto->name, (bfd_vma) 0,
+ input_bfd, input_section, rel->r_offset)))
+ return false;
+ }
+ else
+ {
+ (*_bfd_error_handler)
+ (_("%s(%s+0x%lx): reloc against `%s': error %d"),
+ bfd_archive_filename (input_bfd),
+ bfd_get_section_name (input_bfd, input_section),
+ (long) rel->r_offset, name, (int) r);
+ return false;
+ }
+ }
+ }
+
+ 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;
+{
+ struct elf64_x86_64_link_hash_table *htab;
+
+ htab = elf64_x86_64_hash_table (info);
+
+ if (h->plt.offset != (bfd_vma) -1)
+ {
+ bfd_vma plt_index;
+ bfd_vma got_offset;
+ Elf_Internal_Rela rela;
+ Elf64_External_Rela *loc;
+
+ /* This symbol has an entry in the procedure linkage table. Set
+ 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
+ in all the symbols for which we are making plt entries. The
+ first entry in the procedure linkage table is reserved. */
+ 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 for the dynamic linker. */
+ got_offset = (plt_index + 3) * GOT_ENTRY_SIZE;
+
+ /* Fill in the entry in the procedure linkage table. */
+ 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. */
+ /* 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),
+ htab->sgotplt->contents + got_offset);
+
+ /* Fill in the entry in the .rela.plt section. */
+ 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;
+ loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index;
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
+
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
+ {
+ /* Mark the symbol as undefined, rather than as defined in
+ the .plt section. Leave the value alone. This is a clue
+ for the dynamic linker, to make function pointer
+ comparisons work between an application and shared
+ library. */
+ sym->st_shndx = SHN_UNDEF;
+ }
+ }
+
+ if (h->got.offset != (bfd_vma) -1)
+ {
+ Elf_Internal_Rela rela;
+ Elf64_External_Rela *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
+ && (info->symbolic
+ || h->dynindx == -1
+ || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL))
+ && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
+ {
+ 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;
+ }
+
+ loc = (Elf64_External_Rela *) htab->srelgot->contents;
+ loc += htab->srelgot->reloc_count++;
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
+ }
+
+ if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
+ {
+ Elf_Internal_Rela rela;
+ Elf64_External_Rela *loc;
+
+ /* This symbol needs a copy reloc. Set it up. */
+
+ 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;
+ loc = (Elf64_External_Rela *) htab->srelbss->contents;
+ loc += htab->srelbss->reloc_count++;
+ bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
+ }
+
+ /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
+ if (strcmp (h->root.root.string, "_DYNAMIC") == 0
+ || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
+ sym->st_shndx = SHN_ABS;
+
+ 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 (rela)
+ 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;
+{
+ struct elf64_x86_64_link_hash_table *htab;
+ bfd *dynobj;
+ asection *sdyn;
+
+ htab = elf64_x86_64_hash_table (info);
+ dynobj = htab->elf.dynobj;
+ sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
+
+ if (htab->elf.dynamic_sections_created)
+ {
+ Elf64_External_Dyn *dyncon, *dynconend;
+
+ if (sdyn == NULL || htab->sgot == NULL)
+ abort ();
+
+ dyncon = (Elf64_External_Dyn *) sdyn->contents;
+ dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
+ for (; dyncon < dynconend; dyncon++)
+ {
+ Elf_Internal_Dyn dyn;
+ asection *s;
+
+ bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn);
+
+ switch (dyn.d_tag)
+ {
+ default:
+ continue;
+
+ case DT_PLTGOT:
+ dyn.d_un.d_ptr = htab->sgot->output_section->vma;
+ break;
+
+ case DT_JMPREL:
+ dyn.d_un.d_ptr = htab->srelplt->output_section->vma;
+ break;
+
+ case DT_PLTRELSZ:
+ s = htab->srelplt->output_section;
+ if (s->_cooked_size != 0)
+ dyn.d_un.d_val = s->_cooked_size;
+ else
+ dyn.d_un.d_val = s->_raw_size;
+ break;
+
+ case DT_RELASZ:
+ /* 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)
+ {
+ s = htab->srelplt->output_section;
+ if (s->_cooked_size != 0)
+ dyn.d_un.d_val -= s->_cooked_size;
+ else
+ dyn.d_un.d_val -= s->_raw_size;
+ }
+ break;
+ }
+
+ bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon);
+ }
+
+ /* Fill in the special first entry in the procedure linkage table. */
+ if (htab->splt && htab->splt->_raw_size > 0)
+ {
+ /* 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;
+ }
+ }
+
+ if (htab->sgotplt)
+ {
+ /* Fill in the first three entries in the global offset table. */
+ if (htab->sgotplt->_raw_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;
+ }
+
+ return true;
+}
+
+
+#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
+#define TARGET_LITTLE_NAME "elf64-x86-64"
+#define ELF_ARCH bfd_arch_i386
+#define ELF_MACHINE_CODE EM_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 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 elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
+#define elf_backend_check_relocs elf64_x86_64_check_relocs
+#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_object_p elf64_x86_64_elf_object_p
#include "elf64-target.h"
projects / deliverable / binutils-gdb.git / blobdiff