/* X86-64 specific support for 64-bit ELF
- Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
+#include "bfd_stdint.h"
#include "elf/x86-64.h"
#define elf64_x86_64_local_tlsdesc_gotent(abfd) \
(elf64_x86_64_tdata (abfd)->local_tlsdesc_gotent)
+#define is_x86_64_elf(bfd) \
+ (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
+ && elf_tdata (bfd) != NULL \
+ && elf_object_id (bfd) == X86_64_ELF_TDATA)
+
+static bfd_boolean
+elf64_x86_64_mkobject (bfd *abfd)
+{
+ return bfd_elf_allocate_object (abfd, sizeof (struct elf64_x86_64_obj_tdata),
+ X86_64_ELF_TDATA);
+}
+
/* x86-64 ELF linker hash table. */
struct elf64_x86_64_link_hash_table
_bfd_elf_link_hash_copy_indirect (info, dir, ind);
}
-static bfd_boolean
-elf64_x86_64_mkobject (bfd *abfd)
-{
- if (abfd->tdata.any == NULL)
- {
- bfd_size_type amt = sizeof (struct elf64_x86_64_obj_tdata);
- abfd->tdata.any = bfd_zalloc (abfd, amt);
- if (abfd->tdata.any == NULL)
- return FALSE;
- }
- return bfd_elf_mkobject (abfd);
-}
-
static bfd_boolean
elf64_x86_64_elf_object_p (bfd *abfd)
{
return TRUE;
}
-static int
-elf64_x86_64_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
+typedef union
+ {
+ unsigned char c[2];
+ uint16_t i;
+ }
+x86_64_opcode16;
+
+typedef union
+ {
+ unsigned char c[4];
+ uint32_t i;
+ }
+x86_64_opcode32;
+
+/* Return TRUE if the TLS access code sequence support transition
+ from R_TYPE. */
+
+static bfd_boolean
+elf64_x86_64_check_tls_transition (bfd *abfd, asection *sec,
+ bfd_byte *contents,
+ Elf_Internal_Shdr *symtab_hdr,
+ struct elf_link_hash_entry **sym_hashes,
+ unsigned int r_type,
+ const Elf_Internal_Rela *rel,
+ const Elf_Internal_Rela *relend)
{
- if (info->shared)
- return r_type;
+ unsigned int val;
+ unsigned long r_symndx;
+ struct elf_link_hash_entry *h;
+ bfd_vma offset;
+ /* Get the section contents. */
+ if (contents == NULL)
+ {
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ contents = elf_section_data (sec)->this_hdr.contents;
+ else
+ {
+ /* FIXME: How to better handle error condition? */
+ if (!bfd_malloc_and_get_section (abfd, sec, &contents))
+ return FALSE;
+
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+ }
+
+ offset = rel->r_offset;
switch (r_type)
+ {
+ case R_X86_64_TLSGD:
+ case R_X86_64_TLSLD:
+ if ((rel + 1) >= relend)
+ return FALSE;
+
+ if (r_type == R_X86_64_TLSGD)
+ {
+ /* Check transition from GD access model. Only
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr
+ can transit to different access model. */
+
+ static x86_64_opcode32 leaq = { { 0x66, 0x48, 0x8d, 0x3d } },
+ call = { { 0x66, 0x66, 0x48, 0xe8 } };
+ if (offset < 4
+ || (offset + 12) > sec->size
+ || bfd_get_32 (abfd, contents + offset - 4) != leaq.i
+ || bfd_get_32 (abfd, contents + offset + 4) != call.i)
+ return FALSE;
+ }
+ else
+ {
+ /* Check transition from LD access model. Only
+ leaq foo@tlsld(%rip), %rdi;
+ call __tls_get_addr
+ can transit to different access model. */
+
+ static x86_64_opcode32 ld = { { 0x48, 0x8d, 0x3d, 0xe8 } };
+ x86_64_opcode32 op;
+
+ if (offset < 3 || (offset + 9) > sec->size)
+ return FALSE;
+
+ op.i = bfd_get_32 (abfd, contents + offset - 3);
+ op.c[3] = bfd_get_8 (abfd, contents + offset + 4);
+ if (op.i != ld.i)
+ return FALSE;
+ }
+
+ r_symndx = ELF64_R_SYM (rel[1].r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ return FALSE;
+
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+ return (h != NULL
+ && h->root.root.string != NULL
+ && (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PC32
+ || ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32)
+ && (strcmp (h->root.root.string, "__tls_get_addr") == 0));
+
+ case R_X86_64_GOTTPOFF:
+ /* Check transition from IE access model:
+ movq foo@gottpoff(%rip), %reg
+ addq foo@gottpoff(%rip), %reg
+ */
+
+ if (offset < 3 || (offset + 4) > sec->size)
+ return FALSE;
+
+ val = bfd_get_8 (abfd, contents + offset - 3);
+ if (val != 0x48 && val != 0x4c)
+ return FALSE;
+
+ val = bfd_get_8 (abfd, contents + offset - 2);
+ if (val != 0x8b && val != 0x03)
+ return FALSE;
+
+ val = bfd_get_8 (abfd, contents + offset - 1);
+ return (val & 0xc7) == 5;
+
+ case R_X86_64_GOTPC32_TLSDESC:
+ /* Check transition from GDesc access model:
+ leaq x@tlsdesc(%rip), %rax
+
+ Make sure it's a leaq adding rip to a 32-bit offset
+ into any register, although it's probably almost always
+ going to be rax. */
+
+ if (offset < 3 || (offset + 4) > sec->size)
+ return FALSE;
+
+ val = bfd_get_8 (abfd, contents + offset - 3);
+ if ((val & 0xfb) != 0x48)
+ return FALSE;
+
+ if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
+ return FALSE;
+
+ val = bfd_get_8 (abfd, contents + offset - 1);
+ return (val & 0xc7) == 0x05;
+
+ case R_X86_64_TLSDESC_CALL:
+ /* Check transition from GDesc access model:
+ call *x@tlsdesc(%rax)
+ */
+ if (offset + 2 <= sec->size)
+ {
+ /* Make sure that it's a call *x@tlsdesc(%rax). */
+ static x86_64_opcode16 call = { { 0xff, 0x10 } };
+ return bfd_get_16 (abfd, contents + offset) == call.i;
+ }
+
+ return FALSE;
+
+ default:
+ abort ();
+ }
+}
+
+/* Return TRUE if the TLS access transition is OK or no transition
+ will be performed. Update R_TYPE if there is a transition. */
+
+static bfd_boolean
+elf64_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
+ asection *sec, bfd_byte *contents,
+ Elf_Internal_Shdr *symtab_hdr,
+ struct elf_link_hash_entry **sym_hashes,
+ unsigned int *r_type, int tls_type,
+ const Elf_Internal_Rela *rel,
+ const Elf_Internal_Rela *relend,
+ struct elf_link_hash_entry *h)
+{
+ unsigned int from_type = *r_type;
+ unsigned int to_type = from_type;
+ bfd_boolean check = TRUE;
+
+ switch (from_type)
{
case R_X86_64_TLSGD:
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
case R_X86_64_GOTTPOFF:
- if (is_local)
- return R_X86_64_TPOFF32;
- return R_X86_64_GOTTPOFF;
+ if (!info->shared)
+ {
+ if (h == NULL)
+ to_type = R_X86_64_TPOFF32;
+ else
+ to_type = R_X86_64_GOTTPOFF;
+ }
+
+ /* When we are called from elf64_x86_64_relocate_section,
+ CONTENTS isn't NULL and there may be additional transitions
+ based on TLS_TYPE. */
+ if (contents != NULL)
+ {
+ unsigned int new_to_type = to_type;
+
+ if (!info->shared
+ && h != NULL
+ && h->dynindx == -1
+ && tls_type == GOT_TLS_IE)
+ new_to_type = R_X86_64_TPOFF32;
+
+ if (to_type == R_X86_64_TLSGD
+ || to_type == R_X86_64_GOTPC32_TLSDESC
+ || to_type == R_X86_64_TLSDESC_CALL)
+ {
+ if (tls_type == GOT_TLS_IE)
+ new_to_type = R_X86_64_GOTTPOFF;
+ }
+
+ /* We checked the transition before when we were called from
+ elf64_x86_64_check_relocs. We only want to check the new
+ transition which hasn't been checked before. */
+ check = new_to_type != to_type && from_type == to_type;
+ to_type = new_to_type;
+ }
+
+ break;
+
case R_X86_64_TLSLD:
- return R_X86_64_TPOFF32;
+ if (!info->shared)
+ to_type = R_X86_64_TPOFF32;
+ break;
+
+ default:
+ return TRUE;
+ }
+
+ /* Return TRUE if there is no transition. */
+ if (from_type == to_type)
+ return TRUE;
+
+ /* Check if the transition can be performed. */
+ if (check
+ && ! elf64_x86_64_check_tls_transition (abfd, sec, contents,
+ symtab_hdr, sym_hashes,
+ from_type, rel, relend))
+ {
+ reloc_howto_type *from, *to;
+
+ from = elf64_x86_64_rtype_to_howto (abfd, from_type);
+ to = elf64_x86_64_rtype_to_howto (abfd, to_type);
+
+ (*_bfd_error_handler)
+ (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
+ "in section `%A' failed"),
+ abfd, sec, from->name, to->name,
+ h ? h->root.root.string : "a local symbol",
+ (unsigned long) rel->r_offset);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
}
- return r_type;
+ *r_type = to_type;
+ return TRUE;
}
/* Look through the relocs for a section during the first phase, and
linkage table, and dynamic reloc sections. */
static bfd_boolean
-elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec,
+elf64_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
+ asection *sec,
const Elf_Internal_Rela *relocs)
{
struct elf64_x86_64_link_hash_table *htab;
if (info->relocatable)
return TRUE;
+ BFD_ASSERT (is_x86_64_elf (abfd));
+
htab = elf64_x86_64_hash_table (info);
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
h = (struct elf_link_hash_entry *) h->root.u.i.link;
}
- r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
+ if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
+ symtab_hdr, sym_hashes,
+ &r_type, GOT_UNKNOWN,
+ rel, rel_end, h))
+ return FALSE;
+
switch (r_type)
{
case R_X86_64_TLSLD:
else
{
(*_bfd_error_handler)
- (_("%B: %s' accessed both as normal and thread local symbol"),
+ (_("%B: '%s' accessed both as normal and thread local symbol"),
abfd, h ? h->root.root.string : "<local>");
return FALSE;
}
/* This relocation describes which C++ vtable entries are actually
used. Record for later use during GC. */
case R_X86_64_GNU_VTENTRY:
- if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ BFD_ASSERT (h != NULL);
+ if (h != NULL
+ && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
return FALSE;
break;
static bfd_boolean
elf64_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
- asection *sec, const Elf_Internal_Rela *relocs)
+ 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;
+ if (info->relocatable)
+ return TRUE;
+
elf_section_data (sec)->local_dynrel = NULL;
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = elf_sym_hashes (abfd);
local_got_refcounts = elf_local_got_refcounts (abfd);
}
r_type = ELF64_R_TYPE (rel->r_info);
- r_type = elf64_x86_64_tls_transition (info, r_type, h != NULL);
+ if (! elf64_x86_64_tls_transition (info, abfd, sec, NULL,
+ symtab_hdr, sym_hashes,
+ &r_type, GOT_UNKNOWN,
+ rel, relend, h))
+ return FALSE;
+
switch (r_type)
{
case R_X86_64_TLSLD:
Elf_Internal_Shdr *symtab_hdr;
asection *srel;
- if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
+ if (! is_x86_64_elf (ibfd))
continue;
for (s = ibfd->sections; s != NULL; s = s->next)
if (!local_got)
continue;
- symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
+ symtab_hdr = &elf_symtab_hdr (ibfd);
locsymcount = symtab_hdr->sh_info;
end_local_got = local_got + locsymcount;
local_tls_type = elf64_x86_64_local_got_tls_type (ibfd);
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
+ BFD_ASSERT (is_x86_64_elf (input_bfd));
+
htab = elf64_x86_64_hash_table (info);
- symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ symtab_hdr = &elf_symtab_hdr (input_bfd);
sym_hashes = elf_sym_hashes (input_bfd);
local_got_offsets = elf_local_got_offsets (input_bfd);
local_tlsdesc_gotents = elf64_x86_64_local_tlsdesc_gotent (input_bfd);
case R_X86_64_PC16:
case R_X86_64_PC32:
if (info->shared
- && !SYMBOL_REFERENCES_LOCAL (info, h)
&& (input_section->flags & SEC_ALLOC) != 0
&& (input_section->flags & SEC_READONLY) != 0
- && (!h->def_regular
- || r_type != R_X86_64_PC32
- || h->type != STT_FUNC
- || ELF_ST_VISIBILITY (h->other) != STV_PROTECTED
- || !is_32bit_relative_branch (contents,
- rel->r_offset)))
+ && h != NULL)
{
- if (h->def_regular
- && r_type == R_X86_64_PC32
- && h->type == STT_FUNC
- && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
- (*_bfd_error_handler)
- (_("%B: relocation R_X86_64_PC32 against protected function `%s' can not be used when making a shared object"),
- input_bfd, h->root.root.string);
+ bfd_boolean fail = FALSE;
+ bfd_boolean branch
+ = (r_type == R_X86_64_PC32
+ && is_32bit_relative_branch (contents, rel->r_offset));
+
+ if (SYMBOL_REFERENCES_LOCAL (info, h))
+ {
+ /* Symbol is referenced locally. Make sure it is
+ defined locally or for a branch. */
+ fail = !h->def_regular && !branch;
+ }
else
- (*_bfd_error_handler)
- (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
- input_bfd, x86_64_elf_howto_table[r_type].name,
- h->root.root.string);
- bfd_set_error (bfd_error_bad_value);
- return FALSE;
+ {
+ /* Symbol isn't referenced locally. We only allow
+ branch to symbol with non-default visibility. */
+ fail = (!branch
+ || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT);
+ }
+
+ if (fail)
+ {
+ const char *fmt;
+ const char *v;
+ const char *pic = "";
+
+ switch (ELF_ST_VISIBILITY (h->other))
+ {
+ case STV_HIDDEN:
+ v = _("hidden symbol");
+ break;
+ case STV_INTERNAL:
+ v = _("internal symbol");
+ break;
+ case STV_PROTECTED:
+ v = _("protected symbol");
+ break;
+ default:
+ v = _("symbol");
+ pic = _("; recompile with -fPIC");
+ break;
+ }
+
+ if (h->def_regular)
+ fmt = _("%B: relocation %s against %s `%s' can not be used when making a shared object%s");
+ else
+ fmt = _("%B: relocation %s against undefined %s `%s' can not be used when making a shared object%s");
+
+ (*_bfd_error_handler) (fmt, input_bfd,
+ x86_64_elf_howto_table[r_type].name,
+ v, h->root.root.string, pic);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
}
/* Fall through. */
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
case R_X86_64_GOTTPOFF:
- r_type = elf64_x86_64_tls_transition (info, r_type, h == NULL);
tls_type = GOT_UNKNOWN;
if (h == NULL && local_got_offsets)
tls_type = elf64_x86_64_local_got_tls_type (input_bfd) [r_symndx];
else if (h != NULL)
- {
- tls_type = elf64_x86_64_hash_entry (h)->tls_type;
- if (!info->shared && h->dynindx == -1 && tls_type == GOT_TLS_IE)
- r_type = R_X86_64_TPOFF32;
- }
- if (r_type == R_X86_64_TLSGD
- || r_type == R_X86_64_GOTPC32_TLSDESC
- || r_type == R_X86_64_TLSDESC_CALL)
- {
- if (tls_type == GOT_TLS_IE)
- r_type = R_X86_64_GOTTPOFF;
- }
+ tls_type = elf64_x86_64_hash_entry (h)->tls_type;
+
+ if (! elf64_x86_64_tls_transition (info, input_bfd,
+ input_section, contents,
+ symtab_hdr, sym_hashes,
+ &r_type, tls_type, rel,
+ relend, h))
+ return FALSE;
if (r_type == R_X86_64_TPOFF32)
{
+ bfd_vma roff = rel->r_offset;
+
BFD_ASSERT (! unresolved_reloc);
+
if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
{
- unsigned int i;
- static unsigned char tlsgd[8]
- = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
-
/* GD->LE transition.
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr@plt
+ .word 0x6666; rex64; call __tls_get_addr
Change it into:
movq %fs:0, %rax
leaq foo@tpoff(%rax), %rax */
- BFD_ASSERT (rel->r_offset >= 4);
- for (i = 0; i < 4; i++)
- BFD_ASSERT (bfd_get_8 (input_bfd,
- contents + rel->r_offset - 4 + i)
- == tlsgd[i]);
- BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
- for (i = 0; i < 4; i++)
- BFD_ASSERT (bfd_get_8 (input_bfd,
- contents + rel->r_offset + 4 + i)
- == tlsgd[i+4]);
- BFD_ASSERT (rel + 1 < relend);
- BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
- memcpy (contents + rel->r_offset - 4,
+ memcpy (contents + roff - 4,
"\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
16);
bfd_put_32 (output_bfd, tpoff (info, relocation),
- contents + rel->r_offset + 8);
- /* Skip R_X86_64_PLT32. */
+ contents + roff + 8);
+ /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
rel++;
continue;
}
Change it to:
movl $x@tpoff, %rax
-
- Registers other than %rax may be set up here. */
+ */
unsigned int val, type, type2;
- bfd_vma roff;
- /* First, make sure it's a leaq adding rip to a
- 32-bit offset into any register, although it's
- probably almost always going to be rax. */
- roff = rel->r_offset;
- BFD_ASSERT (roff >= 3);
type = bfd_get_8 (input_bfd, contents + roff - 3);
- BFD_ASSERT ((type & 0xfb) == 0x48);
type2 = bfd_get_8 (input_bfd, contents + roff - 2);
- BFD_ASSERT (type2 == 0x8d);
val = bfd_get_8 (input_bfd, contents + roff - 1);
- BFD_ASSERT ((val & 0xc7) == 0x05);
- BFD_ASSERT (roff + 4 <= input_section->size);
-
- /* Now modify the instruction as appropriate. */
bfd_put_8 (output_bfd, 0x48 | ((type >> 2) & 1),
contents + roff - 3);
bfd_put_8 (output_bfd, 0xc7, contents + roff - 2);
It's originally:
call *(%rax)
Turn it into:
- nop; nop. */
-
- unsigned int val, type;
- bfd_vma roff;
-
- /* First, make sure it's a call *(%rax). */
- roff = rel->r_offset;
- BFD_ASSERT (roff + 2 <= input_section->size);
- type = bfd_get_8 (input_bfd, contents + roff);
- BFD_ASSERT (type == 0xff);
- val = bfd_get_8 (input_bfd, contents + roff + 1);
- BFD_ASSERT (val == 0x10);
-
- /* Now modify the instruction as appropriate. Use
- xchg %ax,%ax instead of 2 nops. */
+ xchg %ax,%ax. */
bfd_put_8 (output_bfd, 0x66, contents + roff);
bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
continue;
}
- else
+ else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTTPOFF)
{
- unsigned int val, type, reg;
-
/* IE->LE transition:
Originally it can be one of:
movq foo@gottpoff(%rip), %reg
movq $foo, %reg
leaq foo(%reg), %reg
addq $foo, %reg. */
- BFD_ASSERT (rel->r_offset >= 3);
- val = bfd_get_8 (input_bfd, contents + rel->r_offset - 3);
- BFD_ASSERT (val == 0x48 || val == 0x4c);
- type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
- BFD_ASSERT (type == 0x8b || type == 0x03);
- reg = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
- BFD_ASSERT ((reg & 0xc7) == 5);
+
+ unsigned int val, type, reg;
+
+ val = bfd_get_8 (input_bfd, contents + roff - 3);
+ type = bfd_get_8 (input_bfd, contents + roff - 2);
+ reg = bfd_get_8 (input_bfd, contents + roff - 1);
reg >>= 3;
- BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
if (type == 0x8b)
{
/* movq */
if (val == 0x4c)
bfd_put_8 (output_bfd, 0x49,
- contents + rel->r_offset - 3);
+ contents + roff - 3);
bfd_put_8 (output_bfd, 0xc7,
- contents + rel->r_offset - 2);
+ contents + roff - 2);
bfd_put_8 (output_bfd, 0xc0 | reg,
- contents + rel->r_offset - 1);
+ contents + roff - 1);
}
else if (reg == 4)
{
special */
if (val == 0x4c)
bfd_put_8 (output_bfd, 0x49,
- contents + rel->r_offset - 3);
+ contents + roff - 3);
bfd_put_8 (output_bfd, 0x81,
- contents + rel->r_offset - 2);
+ contents + roff - 2);
bfd_put_8 (output_bfd, 0xc0 | reg,
- contents + rel->r_offset - 1);
+ contents + roff - 1);
}
else
{
/* addq -> leaq */
if (val == 0x4c)
bfd_put_8 (output_bfd, 0x4d,
- contents + rel->r_offset - 3);
+ contents + roff - 3);
bfd_put_8 (output_bfd, 0x8d,
- contents + rel->r_offset - 2);
+ contents + roff - 2);
bfd_put_8 (output_bfd, 0x80 | reg | (reg << 3),
- contents + rel->r_offset - 1);
+ contents + roff - 1);
}
bfd_put_32 (output_bfd, tpoff (info, relocation),
- contents + rel->r_offset);
+ contents + roff);
continue;
}
+ else
+ BFD_ASSERT (FALSE);
}
if (htab->sgot == NULL)
+ htab->sgot->output_offset + off;
unresolved_reloc = FALSE;
}
- else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
- {
- unsigned int i;
- static unsigned char tlsgd[8]
- = { 0x66, 0x48, 0x8d, 0x3d, 0x66, 0x66, 0x48, 0xe8 };
-
- /* GD->IE transition.
- .byte 0x66; leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr@plt
- Change it into:
- movq %fs:0, %rax
- addq foo@gottpoff(%rip), %rax */
- BFD_ASSERT (rel->r_offset >= 4);
- for (i = 0; i < 4; i++)
- BFD_ASSERT (bfd_get_8 (input_bfd,
- contents + rel->r_offset - 4 + i)
- == tlsgd[i]);
- BFD_ASSERT (rel->r_offset + 12 <= input_section->size);
- for (i = 0; i < 4; i++)
- BFD_ASSERT (bfd_get_8 (input_bfd,
- contents + rel->r_offset + 4 + i)
- == tlsgd[i+4]);
- BFD_ASSERT (rel + 1 < relend);
- BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
- memcpy (contents + rel->r_offset - 4,
- "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
- 16);
-
- relocation = (htab->sgot->output_section->vma
- + htab->sgot->output_offset + off
- - rel->r_offset
- - input_section->output_section->vma
- - input_section->output_offset
- - 12);
- bfd_put_32 (output_bfd, relocation,
- contents + rel->r_offset + 8);
- /* Skip R_X86_64_PLT32. */
- rel++;
- continue;
- }
- else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
+ else
{
- /* GDesc -> IE transition.
- It's originally something like:
- leaq x@tlsdesc(%rip), %rax
-
- Change it to:
- movq x@gottpoff(%rip), %rax # before nop; nop
-
- Registers other than %rax may be set up here. */
-
- unsigned int val, type, type2;
- bfd_vma roff;
-
- /* First, make sure it's a leaq adding rip to a 32-bit
- offset into any register, although it's probably
- almost always going to be rax. */
- roff = rel->r_offset;
- BFD_ASSERT (roff >= 3);
- type = bfd_get_8 (input_bfd, contents + roff - 3);
- BFD_ASSERT ((type & 0xfb) == 0x48);
- type2 = bfd_get_8 (input_bfd, contents + roff - 2);
- BFD_ASSERT (type2 == 0x8d);
- val = bfd_get_8 (input_bfd, contents + roff - 1);
- BFD_ASSERT ((val & 0xc7) == 0x05);
- BFD_ASSERT (roff + 4 <= input_section->size);
-
- /* Now modify the instruction as appropriate. */
- /* To turn a leaq into a movq in the form we use it, it
- suffices to change the second byte from 0x8d to
- 0x8b. */
- bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
+ bfd_vma roff = rel->r_offset;
- bfd_put_32 (output_bfd,
- htab->sgot->output_section->vma
- + htab->sgot->output_offset + off
- - rel->r_offset
- - input_section->output_section->vma
- - input_section->output_offset
- - 4,
- contents + roff);
- continue;
- }
- else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
- {
- /* GDesc -> IE transition.
- It's originally:
- call *(%rax)
+ if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
+ {
+ /* GD->IE transition.
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@plt
+ Change it into:
+ movq %fs:0, %rax
+ addq foo@gottpoff(%rip), %rax */
+ memcpy (contents + roff - 4,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
+ 16);
+
+ relocation = (htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off
+ - roff
+ - input_section->output_section->vma
+ - input_section->output_offset
+ - 12);
+ bfd_put_32 (output_bfd, relocation,
+ contents + roff + 8);
+ /* Skip R_X86_64_PLT32. */
+ rel++;
+ continue;
+ }
+ else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
+ {
+ /* GDesc -> IE transition.
+ It's originally something like:
+ leaq x@tlsdesc(%rip), %rax
+
+ Change it to:
+ movq x@gottpoff(%rip), %rax # before xchg %ax,%ax
+ */
- Change it to:
- nop; nop. */
+ unsigned int val, type, type2;
- unsigned int val, type;
- bfd_vma roff;
+ type = bfd_get_8 (input_bfd, contents + roff - 3);
+ type2 = bfd_get_8 (input_bfd, contents + roff - 2);
+ val = bfd_get_8 (input_bfd, contents + roff - 1);
- /* First, make sure it's a call *(%eax). */
- roff = rel->r_offset;
- BFD_ASSERT (roff + 2 <= input_section->size);
- type = bfd_get_8 (input_bfd, contents + roff);
- BFD_ASSERT (type == 0xff);
- val = bfd_get_8 (input_bfd, contents + roff + 1);
- BFD_ASSERT (val == 0x10);
+ /* Now modify the instruction as appropriate. To
+ turn a leaq into a movq in the form we use it, it
+ suffices to change the second byte from 0x8d to
+ 0x8b. */
+ bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
+
+ bfd_put_32 (output_bfd,
+ htab->sgot->output_section->vma
+ + htab->sgot->output_offset + off
+ - rel->r_offset
+ - input_section->output_section->vma
+ - input_section->output_offset
+ - 4,
+ contents + roff);
+ continue;
+ }
+ else if (ELF64_R_TYPE (rel->r_info) == R_X86_64_TLSDESC_CALL)
+ {
+ /* GDesc -> IE transition.
+ It's originally:
+ call *(%rax)
- /* 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);
+ Change it to:
+ xchg %ax,%ax. */
- continue;
+ unsigned int val, type;
+
+ type = bfd_get_8 (input_bfd, contents + roff);
+ val = bfd_get_8 (input_bfd, contents + roff + 1);
+ bfd_put_8 (output_bfd, 0x66, contents + roff);
+ bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
+ continue;
+ }
+ else
+ BFD_ASSERT (FALSE);
}
- else
- BFD_ASSERT (FALSE);
break;
case R_X86_64_TLSLD:
- if (! info->shared)
+ if (! elf64_x86_64_tls_transition (info, input_bfd,
+ input_section, contents,
+ symtab_hdr, sym_hashes,
+ &r_type, GOT_UNKNOWN,
+ rel, relend, h))
+ return FALSE;
+
+ if (r_type != R_X86_64_TLSLD)
{
/* LD->LE transition:
- Ensure it is:
- leaq foo@tlsld(%rip), %rdi; call __tls_get_addr@plt.
+ leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
We change it into:
.word 0x6666; .byte 0x66; movl %fs:0, %rax. */
- BFD_ASSERT (rel->r_offset >= 3);
- BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 3)
- == 0x48);
- BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
- == 0x8d);
- BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 1)
- == 0x3d);
- BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
- BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
- == 0xe8);
- BFD_ASSERT (rel + 1 < relend);
- BFD_ASSERT (ELF64_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
+
+ BFD_ASSERT (r_type == R_X86_64_TPOFF32);
memcpy (contents + rel->r_offset - 3,
"\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
- /* Skip R_X86_64_PLT32. */
+ /* Skip R_X86_64_PC32/R_X86_64_PLT32. */
rel++;
continue;
}
if (info->shared
&& SYMBOL_REFERENCES_LOCAL (info, h))
{
+ if (!h->def_regular)
+ return FALSE;
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
}
else if (sym->st_shndx == SHN_X86_64_LCOMMON
&& (elf_section_flags (*oldsec) & SHF_X86_64_LARGE) == 0)
- *psec = *sec = bfd_com_section_ptr;
+ *psec = *sec = bfd_com_section_ptr;
}
return TRUE;
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
asection *s;
- int count = 0;
+ int count = 0;
/* Check to see if we need a large readonly segment. */
s = bfd_get_section_by_name (abfd, ".lrodata");
return _bfd_elf_hash_symbol (h);
}
-static const struct bfd_elf_special_section
+static const struct bfd_elf_special_section
elf64_x86_64_special_sections[]=
{
{ STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS, SHF_ALLOC + SHF_WRITE + SHF_X86_64_LARGE},
elf64_x86_64_reloc_name_lookup
#define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol
+#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
#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
projects / deliverable / binutils-gdb.git / blobdiff