/* X86-64 specific support for 64-bit ELF
- Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006
+ Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
return 0;
}
+static reloc_howto_type *
+elf64_x86_64_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ const char *r_name)
+{
+ unsigned int i;
+
+ for (i = 0;
+ i < (sizeof (x86_64_elf_howto_table)
+ / sizeof (x86_64_elf_howto_table[0]));
+ i++)
+ if (x86_64_elf_howto_table[i].name != NULL
+ && strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
+ return &x86_64_elf_howto_table[i];
+
+ return NULL;
+}
+
/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
static void
{
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. */
+ 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
};
/* Subsequent entries in a procedure linkage table look like this. */
&& (r_type != R_X86_64_PC32)
&& (r_type != R_X86_64_PC64))
|| (h != NULL
- && (! info->symbolic
+ && (! SYMBOLIC_BIND (info, h)
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
|| (ELIMINATE_COPY_RELOCS
if (name == NULL)
return FALSE;
- if (strncmp (name, ".rela", 5) != 0
+ if (! CONST_STRNEQ (name, ".rela")
|| strcmp (bfd_get_section_name (abfd, sec),
name + 5) != 0)
{
static asection *
elf64_x86_64_gc_mark_hook (asection *sec,
- struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info,
Elf_Internal_Rela *rel,
struct elf_link_hash_entry *h,
Elf_Internal_Sym *sym)
{
if (h != NULL)
- {
- switch (ELF64_R_TYPE (rel->r_info))
- {
- 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:
- break;
- }
- }
- }
- else
- return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
-
- return NULL;
+ switch (ELF64_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_GNU_VTINHERIT:
+ case R_X86_64_GNU_VTENTRY:
+ return NULL;
+ }
+
+ return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
/* Update the got entry reference counts for the section being removed. */
{
struct elf64_x86_64_link_hash_table *htab;
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,
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
- 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->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 (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->size;
- /* Increment the section size to make room for the symbol. */
- s->size += h->size;
-
- return TRUE;
+ return _bfd_elf_adjust_dynamic_copy (h, s);
}
/* Allocate space in .plt, .got and associated reloc sections for
/* 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)
+ else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
{
if (s->size != 0 && s != htab->srelplt)
relocs = TRUE;
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
- 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);
h, sec, relocation,
unresolved_reloc, warned);
}
+
+ if (sec != NULL && elf_discarded_section (sec))
+ {
+ /* For relocs against symbols from removed linkonce sections,
+ or sections discarded by a linker script, we just want the
+ section contents zeroed. Avoid any special processing. */
+ _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
+ rel->r_info = 0;
+ rel->r_addend = 0;
+ continue;
+ }
+
+ if (info->relocatable)
+ continue;
+
/* When generating a shared object, the relocations handled here are
copied into the output file to be resolved at run time. */
switch (r_type)
/* 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)
+ if ((input_section->flags & SEC_ALLOC) == 0)
break;
if ((info->shared
|| r_type == R_X86_64_PC32
|| r_type == R_X86_64_PC64
|| !info->shared
- || !info->symbolic
+ || !SYMBOLIC_BIND (info, h)
|| !h->def_regular))
{
outrel.r_info = ELF64_R_INFO (h->dynindx, r_type);
{
asection *osec;
+ /* We are turning this relocation into one
+ against a section symbol. It would be
+ proper to subtract the symbol's value,
+ osec->vma, from the emitted reloc addend,
+ but ld.so expects buggy relocs. */
osec = sec->output_section;
sindx = elf_section_data (osec)->dynindx;
- BFD_ASSERT (sindx > 0);
+ if (sindx == 0)
+ {
+ asection *oi = htab->elf.text_index_section;
+ sindx = elf_section_data (oi)->dynindx;
+ }
+ BFD_ASSERT (sindx != 0);
}
outrel.r_info = ELF64_R_INFO (sindx, r_type);
val = bfd_get_8 (input_bfd, contents + roff + 1);
BFD_ASSERT (val == 0x10);
- /* Now modify the instruction as appropriate. */
- bfd_put_8 (output_bfd, 0x90, contents + roff);
+ /* Now modify the instruction as appropriate. Use
+ xchg %ax,%ax instead of 2 nops. */
+ bfd_put_8 (output_bfd, 0x66, contents + roff);
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
continue;
}
val = bfd_get_8 (input_bfd, contents + roff + 1);
BFD_ASSERT (val == 0x10);
- /* Now modify the instruction as appropriate. */
- bfd_put_8 (output_bfd, 0x90, contents + roff);
+ /* Now modify the instruction as appropriate. Use
+ xchg %ax,%ax instead of 2 nops. */
+ bfd_put_8 (output_bfd, 0x66, contents + roff);
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
continue;
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,
return count;
}
+/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
+
+static bfd_boolean
+elf64_x86_64_hash_symbol (struct elf_link_hash_entry *h)
+{
+ if (h->plt.offset != (bfd_vma) -1
+ && !h->def_regular
+ && !h->pointer_equality_needed)
+ return FALSE;
+
+ return _bfd_elf_hash_symbol (h);
+}
+
static const struct bfd_elf_special_section
elf64_x86_64_special_sections[]=
{
- { ".gnu.linkonce.lb", 16, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
- { ".gnu.linkonce.lr", 16, -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
- { ".gnu.linkonce.lt", 16, -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
- { ".lbss", 5, -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
- { ".ldata", 6, -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
- { ".lrodata", 8, -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
- { NULL, 0, 0, 0, 0 }
+ { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
+ { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
+ { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR + SHF_X86_64_LARGE},
+ { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
+ { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
+ { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS, SHF_ALLOC + SHF_X86_64_LARGE},
+ { NULL, 0, 0, 0, 0 }
};
#define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec
#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_name_lookup \
+ elf64_x86_64_reloc_name_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_relocate_section elf64_x86_64_relocate_section
#define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections
#define elf_backend_always_size_sections elf64_x86_64_always_size_sections
+#define elf_backend_init_index_section _bfd_elf_init_1_index_section
#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
elf64_x86_64_special_sections
#define elf_backend_additional_program_headers \
elf64_x86_64_additional_program_headers
+#define elf_backend_hash_symbol \
+ elf64_x86_64_hash_symbol
+
+#include "elf64-target.h"
+
+/* FreeBSD support. */
+
+#undef TARGET_LITTLE_SYM
+#define TARGET_LITTLE_SYM bfd_elf64_x86_64_freebsd_vec
+#undef TARGET_LITTLE_NAME
+#define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
+
+#undef ELF_OSABI
+#define ELF_OSABI ELFOSABI_FREEBSD
+
+#undef elf_backend_post_process_headers
+#define elf_backend_post_process_headers _bfd_elf_set_osabi
+
+#undef elf64_bed
+#define elf64_bed elf64_x86_64_fbsd_bed
#include "elf64-target.h"
projects / deliverable / binutils-gdb.git / blobdiff