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Diffstat (limited to 'contrib/binutils/bfd/elf64-x86-64.c')
-rw-r--r--contrib/binutils/bfd/elf64-x86-64.c252
1 files changed, 144 insertions, 108 deletions
diff --git a/contrib/binutils/bfd/elf64-x86-64.c b/contrib/binutils/bfd/elf64-x86-64.c
index 6153468..4bbbb08 100644
--- a/contrib/binutils/bfd/elf64-x86-64.c
+++ b/contrib/binutils/bfd/elf64-x86-64.c
@@ -79,7 +79,16 @@ static reloc_howto_type x86_64_elf_howto_table[] =
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)
+ 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. */
@@ -89,7 +98,7 @@ struct elf_reloc_map
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, },
@@ -107,6 +116,8 @@ static CONST struct elf_reloc_map x86_64_reloc_map[] =
{ 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
@@ -115,6 +126,17 @@ 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 boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd));
+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 ((bfd *, 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 *elf64_x86_64_link_hash_newfunc
PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
@@ -131,6 +153,8 @@ static boolean elf64_x86_64_finish_dynamic_symbol
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 *
@@ -143,8 +167,7 @@ elf64_x86_64_reloc_type_lookup (abfd, code)
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;
}
@@ -157,11 +180,20 @@ elf64_x86_64_info_to_howto (abfd, cache_ptr, dst)
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);
}
@@ -295,9 +327,9 @@ elf64_x86_64_link_hash_table_create (abfd)
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)));
+ ret = ((struct elf64_x86_64_link_hash_table *) bfd_alloc (abfd, amt));
if (ret == (struct elf64_x86_64_link_hash_table *) NULL)
return NULL;
@@ -311,7 +343,7 @@ elf64_x86_64_link_hash_table_create (abfd)
return &ret->root.root;
}
-boolean
+static boolean
elf64_x86_64_elf_object_p (abfd)
bfd *abfd;
{
@@ -409,10 +441,8 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
if (h != NULL)
{
- if (h->got.refcount == -1)
+ if (h->got.refcount == 0)
{
- h->got.refcount = 1;
-
/* Make sure this symbol is output as a dynamic symbol. */
if (h->dynindx == -1)
{
@@ -423,28 +453,25 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
sgot->_raw_size += GOT_ENTRY_SIZE;
srelgot->_raw_size += sizeof (Elf64_External_Rela);
}
- else
- h->got.refcount += 1;
+ h->got.refcount += 1;
}
else
{
/* This is a global offset table entry for a local symbol. */
if (local_got_refcounts == NULL)
{
- size_t size;
+ bfd_size_type size;
- size = symtab_hdr->sh_info * sizeof (bfd_signed_vma);
+ size = symtab_hdr->sh_info;
+ size *= sizeof (bfd_signed_vma);
local_got_refcounts = ((bfd_signed_vma *)
- bfd_alloc (abfd, size));
+ bfd_zalloc (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)
+ if (local_got_refcounts[r_symndx] == 0)
{
- local_got_refcounts[r_symndx] = 1;
-
sgot->_raw_size += GOT_ENTRY_SIZE;
if (info->shared)
{
@@ -454,8 +481,7 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
srelgot->_raw_size += sizeof (Elf64_External_Rela);
}
}
- else
- local_got_refcounts[r_symndx] += 1;
+ local_got_refcounts[r_symndx] += 1;
}
break;
@@ -473,10 +499,7 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
continue;
h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
- if (h->plt.refcount == -1)
- h->plt.refcount = 1;
- else
- h->plt.refcount += 1;
+ h->plt.refcount += 1;
break;
case R_X86_64_8:
@@ -545,6 +568,8 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
|| ! bfd_set_section_alignment (dynobj, sreloc, 3))
return false;
}
+ if (sec->flags & SEC_READONLY)
+ info->flags |= DF_TEXTREL;
}
sreloc->_raw_size += sizeof (Elf64_External_Rela);
@@ -572,7 +597,7 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
if (p == NULL)
{
p = ((struct elf64_x86_64_pcrel_relocs_copied *)
- bfd_alloc (dynobj, sizeof *p));
+ bfd_alloc (dynobj, (bfd_size_type) sizeof *p));
if (p == NULL)
return false;
p->next = eh->pcrel_relocs_copied;
@@ -585,6 +610,20 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs)
}
}
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;
}
}
@@ -604,28 +643,30 @@ elf64_x86_64_gc_mark_hook (abfd, info, rel, h, 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 (abfd, sym->st_shndx);
}
return NULL;
@@ -807,6 +848,8 @@ elf64_x86_64_adjust_dynamic_symbol (info, h)
return true;
}
+ else
+ 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
@@ -893,14 +936,13 @@ elf64_x86_64_adjust_dynamic_symbol (info, h)
static boolean
elf64_x86_64_size_dynamic_sections (output_bfd, info)
- bfd *output_bfd;
+ bfd *output_bfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
{
bfd *dynobj;
asection *s;
boolean plt;
boolean relocs;
- boolean reltext;
dynobj = elf_hash_table (info)->dynobj;
BFD_ASSERT (dynobj != NULL);
@@ -940,7 +982,7 @@ elf64_x86_64_size_dynamic_sections (output_bfd, 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;
+ plt = relocs = false;
for (s = dynobj->sections; s != NULL; s = s->next)
{
const char *name;
@@ -985,29 +1027,8 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info)
}
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;
- }
+ relocs = true;
/* We use the reloc_count field as a counter if we need
to copy relocs into the output file. */
@@ -1043,37 +1064,39 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info)
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 (! bfd_elf64_add_dynamic_entry (info, DT_DEBUG, 0))
+ if (!add_dynamic_entry (DT_DEBUG, 0))
return false;
}
if (plt)
{
- 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_RELA)
- || ! bfd_elf64_add_dynamic_entry (info, DT_JMPREL, 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 (! 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)))
+ 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 (reltext)
+ if ((info->flags & DF_TEXTREL) != 0)
{
- if (! bfd_elf64_add_dynamic_entry (info, DT_TEXTREL, 0))
+ if (!add_dynamic_entry (DT_TEXTREL, 0))
return false;
- info->flags |= DF_TEXTREL;
}
}
+#undef add_dynamic_entry
return true;
}
@@ -1160,6 +1183,9 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
unsigned int indx;
r_type = ELF64_R_TYPE (rela->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)
{
@@ -1197,9 +1223,7 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
{
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, rela);
}
else
{
@@ -1249,7 +1273,7 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
{
(*_bfd_error_handler)
(_("%s: warning: unresolvable relocation against symbol `%s' from %s section"),
- bfd_get_filename (input_bfd), h->root.root.string,
+ bfd_archive_filename (input_bfd), h->root.root.string,
bfd_get_section_name (input_bfd, input_section));
relocation = 0;
}
@@ -1260,7 +1284,9 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
- else if (info->shared && !info->symbolic && !info->no_undefined
+ else if (info->shared
+ && (!info->symbolic || info->allow_shlib_undefined)
+ && !info->no_undefined
&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
relocation = 0;
else
@@ -1408,7 +1434,9 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
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. */
- if (info->shared && (input_section->flags & SEC_ALLOC) != 0)
+ if (info->shared
+ && r_symndx != 0
+ && (input_section->flags & SEC_ALLOC) != 0)
{
Elf_Internal_Rela outrel;
boolean skip, relocate;
@@ -1439,21 +1467,11 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
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;
- }
+ outrel.r_offset =
+ _bfd_elf_section_offset (output_bfd, info, input_section,
+ rela->r_offset);
+ if (outrel.r_offset == (bfd_vma) -1)
+ skip = true;
outrel.r_offset += (input_section->output_section->vma
+ input_section->output_offset);
@@ -1485,7 +1503,7 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
}
else
{
- long indx;
+ long sindx;
if (h == NULL)
sec = local_sections[r_symndx];
@@ -1497,7 +1515,7 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
sec = h->root.u.def.section;
}
if (sec != NULL && bfd_is_abs_section (sec))
- indx = 0;
+ sindx = 0;
else if (sec == NULL || sec->owner == NULL)
{
bfd_set_error (bfd_error_bad_value);
@@ -1508,12 +1526,12 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section,
asection *osec;
osec = sec->output_section;
- indx = elf_section_data (osec)->dynindx;
- BFD_ASSERT (indx > 0);
+ sindx = elf_section_data (osec)->dynindx;
+ BFD_ASSERT (sindx > 0);
}
relocate = false;
- outrel.r_info = ELF64_R_INFO (indx, r_type);
+ outrel.r_info = ELF64_R_INFO (sindx, r_type);
outrel.r_addend = relocation + rela->r_addend;
}
@@ -1694,7 +1712,7 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym)
rela.r_offset = (sgot->output_section->vma
+ sgot->output_offset
- + (h->got.offset &~ 1));
+ + (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
@@ -1893,6 +1911,22 @@ elf64_x86_64_finish_dynamic_sections (output_bfd, info)
return true;
}
+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;
+ }
+}
#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
#define TARGET_LITTLE_NAME "elf64-x86-64"
@@ -1901,6 +1935,7 @@ elf64_x86_64_finish_dynamic_sections (output_bfd, info)
#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
@@ -1925,5 +1960,6 @@ elf64_x86_64_finish_dynamic_sections (output_bfd, info)
#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
+#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class
#include "elf64-target.h"
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