/* X86-64 specific support for ELF
- Copyright (C) 2000-2015 Free Software Foundation, Inc.
+ Copyright (C) 2000-2016 Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
This file is part of BFD, the Binary File Descriptor library.
#include "dwarf2.h"
#include "libiberty.h"
+#include "opcode/i386.h"
#include "elf/x86-64.h"
#ifdef CORE_HEADER
HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
TRUE),
+ HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
+ HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
+ bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
+ 0xffffffff, TRUE),
/* We have a gap in the reloc numbers here.
R_X86_64_standard counts the number up to this point, and
R_X86_64_vt_offset is the value to subtract from a reloc type of
R_X86_64_GNU_VT* to form an index into this table. */
-#define R_X86_64_standard (R_X86_64_PLT32_BND + 1)
+#define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
/* GNU extension to record C++ vtable hierarchy. */
{ BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
{ BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
{ BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
- { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND,},
- { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND,},
+ { BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
+ { BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
+ { BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
+ { BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
{ BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
{ BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
};
{
if (r_type >= (unsigned int) R_X86_64_standard)
{
- (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
- abfd, (int) r_type);
+ _bfd_error_handler (_("%B: invalid relocation type %d"),
+ abfd, (int) r_type);
r_type = R_X86_64_NONE;
}
i = r_type;
#define elf_backend_arch_data &elf_x86_64_arch_bed
+/* Is a undefined weak symbol which is resolved to 0. Reference to an
+ undefined weak symbol is resolved to 0 when building executable if
+ it isn't dynamic and
+ 1. Has non-GOT/non-PLT relocations in text section. Or
+ 2. Has no GOT/PLT relocation.
+ */
+#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
+ ((EH)->elf.root.type == bfd_link_hash_undefweak \
+ && bfd_link_executable (INFO) \
+ && (elf_x86_64_hash_table (INFO)->interp == NULL \
+ || !(GOT_RELOC) \
+ || (EH)->has_non_got_reloc \
+ || !(INFO)->dynamic_undefined_weak))
+
/* x86-64 ELF linker hash entry. */
struct elf_x86_64_link_hash_entry
/* TRUE if symbol has at least one BND relocation. */
unsigned int has_bnd_reloc : 1;
+ /* TRUE if symbol has GOT or PLT relocations. */
+ unsigned int has_got_reloc : 1;
+
+ /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
+ unsigned int has_non_got_reloc : 1;
+
+ /* 0: symbol isn't __tls_get_addr.
+ 1: symbol is __tls_get_addr.
+ 2: symbol is unknown. */
+ unsigned int tls_get_addr : 2;
+
+ /* Reference count of C/C++ function pointer relocations in read-write
+ section which can be resolved at run-time. */
+ bfd_signed_vma func_pointer_refcount;
+
/* Information about the GOT PLT entry. Filled when there are both
GOT and PLT relocations against the same function. */
union gotplt_union plt_got;
struct elf_link_hash_table elf;
/* Short-cuts to get to dynamic linker sections. */
+ asection *interp;
asection *sdynbss;
asection *srelbss;
asection *plt_eh_frame;
bfd_vma next_jump_slot_index;
/* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
bfd_vma next_irelative_index;
+
+ /* TRUE if there are dynamic relocs against IFUNC symbols that apply
+ to read-only sections. */
+ bfd_boolean readonly_dynrelocs_against_ifunc;
};
/* Get the x86-64 ELF linker hash table from a link_info structure. */
eh->tls_type = GOT_UNKNOWN;
eh->needs_copy = 0;
eh->has_bnd_reloc = 0;
+ eh->has_got_reloc = 0;
+ eh->has_non_got_reloc = 0;
+ eh->tls_get_addr = 2;
+ eh->func_pointer_refcount = 0;
eh->plt_bnd.offset = (bfd_vma) -1;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
ret->elf.indx = sec->id;
ret->elf.dynstr_index = htab->r_sym (rel->r_info);
ret->elf.dynindx = -1;
+ ret->func_pointer_refcount = 0;
ret->plt_got.offset = (bfd_vma) -1;
*slot = ret;
}
if (htab == NULL)
return FALSE;
+ /* Set the contents of the .interp section to the interpreter. */
+ if (bfd_link_executable (info) && !info->nointerp)
+ {
+ asection *s = bfd_get_linker_section (dynobj, ".interp");
+ if (s == NULL)
+ abort ();
+ s->size = htab->dynamic_interpreter_size;
+ s->contents = (unsigned char *) htab->dynamic_interpreter;
+ htab->interp = s;
+ }
+
htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
if (!htab->sdynbss)
abort ();
- if (info->executable)
+ if (bfd_link_executable (info))
{
/* Always allow copy relocs for building executables. */
asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
|| !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
return FALSE;
}
+
+ /* Align .got section to its entry size. */
+ if (htab->elf.sgot != NULL
+ && !bfd_set_section_alignment (dynobj, htab->elf.sgot, 3))
+ return FALSE;
+
+ /* Align .got.plt section to its entry size. */
+ if (htab->elf.sgotplt != NULL
+ && !bfd_set_section_alignment (dynobj, htab->elf.sgotplt, 3))
+ return FALSE;
+
return TRUE;
}
if (!edir->has_bnd_reloc)
edir->has_bnd_reloc = eind->has_bnd_reloc;
+ if (!edir->has_got_reloc)
+ edir->has_got_reloc = eind->has_got_reloc;
+
+ if (!edir->has_non_got_reloc)
+ edir->has_non_got_reloc = eind->has_non_got_reloc;
+
if (eind->dyn_relocs != NULL)
{
if (edir->dyn_relocs != NULL)
dir->pointer_equality_needed |= ind->pointer_equality_needed;
}
else
- _bfd_elf_link_hash_copy_indirect (info, dir, ind);
+ {
+ if (eind->func_pointer_refcount > 0)
+ {
+ edir->func_pointer_refcount += eind->func_pointer_refcount;
+ eind->func_pointer_refcount = 0;
+ }
+
+ _bfd_elf_link_hash_copy_indirect (info, dir, ind);
+ }
}
static bfd_boolean
struct elf_link_hash_entry *h;
bfd_vma offset;
struct elf_x86_64_link_hash_table *htab;
-
- /* 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;
- }
- }
+ bfd_byte *call;
+ bfd_boolean indirect_call, tls_get_addr;
htab = elf_x86_64_hash_table (info);
offset = rel->r_offset;
{
/* Check transition from GD access model. For 64bit, only
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
can transit to different access model. For 32bit, only
leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr
- can transit to different access model. For largepic
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
+ can transit to different access model. For largepic,
we also support:
+ leaq foo@tlsgd(%rip), %rdi
+ movabsq $__tls_get_addr@pltoff, %rax
+ addq $r15, %rax
+ call *%rax
+ or
leaq foo@tlsgd(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $rbx, %rax
- call *%rax. */
+ call *%rax */
- static const unsigned char call[] = { 0x66, 0x66, 0x48, 0xe8 };
static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
if ((offset + 12) > sec->size)
return FALSE;
- if (memcmp (contents + offset + 4, call, 4) != 0)
+ call = contents + offset + 4;
+ if (call[0] != 0x66
+ || !((call[1] == 0x48
+ && call[2] == 0xff
+ && call[3] == 0x15)
+ || (call[1] == 0x48
+ && call[2] == 0x67
+ && call[3] == 0xe8)
+ || (call[1] == 0x66
+ && call[2] == 0x48
+ && call[3] == 0xe8)))
{
if (!ABI_64_P (abfd)
|| (offset + 19) > sec->size
|| offset < 3
- || memcmp (contents + offset - 3, leaq + 1, 3) != 0
- || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
- || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
- != 0)
+ || memcmp (call - 7, leaq + 1, 3) != 0
+ || memcmp (call, "\x48\xb8", 2) != 0
+ || call[11] != 0x01
+ || call[13] != 0xff
+ || call[14] != 0xd0
+ || !((call[10] == 0x48 && call[12] == 0xd8)
+ || (call[10] == 0x4c && call[12] == 0xf8)))
return FALSE;
largepic = TRUE;
}
|| memcmp (contents + offset - 3, leaq + 1, 3) != 0)
return FALSE;
}
+ indirect_call = call[2] == 0xff;
}
else
{
/* Check transition from LD access model. Only
leaq foo@tlsld(%rip), %rdi;
- call __tls_get_addr
+ call __tls_get_addr@PLT
+ or
+ leaq foo@tlsld(%rip), %rdi;
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
can transit to different access model. For largepic
we also support:
+ leaq foo@tlsld(%rip), %rdi
+ movabsq $__tls_get_addr@pltoff, %rax
+ addq $r15, %rax
+ call *%rax
+ or
leaq foo@tlsld(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $rbx, %rax
- call *%rax. */
+ call *%rax */
static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
if (memcmp (contents + offset - 3, lea, 3) != 0)
return FALSE;
- if (0xe8 != *(contents + offset + 4))
+ call = contents + offset + 4;
+ if (!(call[0] == 0xe8
+ || (call[0] == 0xff && call[1] == 0x15)
+ || (call[0] == 0x67 && call[1] == 0xe8)))
{
if (!ABI_64_P (abfd)
|| (offset + 19) > sec->size
- || memcmp (contents + offset + 4, "\x48\xb8", 2) != 0
- || memcmp (contents + offset + 14, "\x48\x01\xd8\xff\xd0", 5)
- != 0)
+ || memcmp (call, "\x48\xb8", 2) != 0
+ || call[11] != 0x01
+ || call[13] != 0xff
+ || call[14] != 0xd0
+ || !((call[10] == 0x48 && call[12] == 0xd8)
+ || (call[10] == 0x4c && call[12] == 0xf8)))
return FALSE;
largepic = TRUE;
}
+ indirect_call = call[0] == 0xff;
}
r_symndx = htab->r_sym (rel[1].r_info);
if (r_symndx < symtab_hdr->sh_info)
return FALSE;
+ tls_get_addr = FALSE;
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
- /* Use strncmp to check __tls_get_addr since __tls_get_addr
- may be versioned. */
- return (h != NULL
- && h->root.root.string != NULL
- && (largepic
- ? ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64
- : (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
- || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32))
- && (strncmp (h->root.root.string,
- "__tls_get_addr", 14) == 0));
+ if (h != NULL && h->root.root.string != NULL)
+ {
+ struct elf_x86_64_link_hash_entry *eh
+ = (struct elf_x86_64_link_hash_entry *) h;
+ tls_get_addr = eh->tls_get_addr == 1;
+ if (eh->tls_get_addr > 1)
+ {
+ /* Use strncmp to check __tls_get_addr since
+ __tls_get_addr may be versioned. */
+ if (strncmp (h->root.root.string, "__tls_get_addr", 14)
+ == 0)
+ {
+ eh->tls_get_addr = 1;
+ tls_get_addr = TRUE;
+ }
+ else
+ eh->tls_get_addr = 0;
+ }
+ }
+
+ if (!tls_get_addr)
+ return FALSE;
+ else if (largepic)
+ return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
+ else if (indirect_call)
+ return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
+ else
+ return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
+ || ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
case R_X86_64_GOTTPOFF:
/* Check transition from IE access model:
if (offset + 2 <= sec->size)
{
/* Make sure that it's a call *x@tlsdesc(%rax). */
- static const unsigned char call[] = { 0xff, 0x10 };
- return memcmp (contents + offset, call, 2) == 0;
+ call = contents + offset;
+ return call[0] == 0xff && call[1] == 0x10;
}
return FALSE;
const Elf_Internal_Rela *rel,
const Elf_Internal_Rela *relend,
struct elf_link_hash_entry *h,
- unsigned long r_symndx)
+ unsigned long r_symndx,
+ bfd_boolean from_relocate_section)
{
unsigned int from_type = *r_type;
unsigned int to_type = from_type;
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
case R_X86_64_GOTTPOFF:
- if (info->executable)
+ if (bfd_link_executable (info))
{
if (h == NULL)
to_type = R_X86_64_TPOFF32;
to_type = R_X86_64_GOTTPOFF;
}
- /* When we are called from elf_x86_64_relocate_section,
- CONTENTS isn't NULL and there may be additional transitions
- based on TLS_TYPE. */
- if (contents != NULL)
+ /* When we are called from elf_x86_64_relocate_section, there may
+ be additional transitions based on TLS_TYPE. */
+ if (from_relocate_section)
{
unsigned int new_to_type = to_type;
- if (info->executable
+ if (bfd_link_executable (info)
&& h != NULL
&& h->dynindx == -1
&& tls_type == GOT_TLS_IE)
break;
case R_X86_64_TLSLD:
- if (info->executable)
+ if (bfd_link_executable (info))
to_type = R_X86_64_TPOFF32;
break;
}
}
- (*_bfd_error_handler)
+ _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, name,
/* Rename some of the generic section flags to better document how they
are used here. */
-#define need_convert_mov_to_lea sec_flg0
+#define need_convert_load sec_flg0
+#define check_relocs_failed sec_flg1
+
+static bfd_boolean
+elf_x86_64_need_pic (bfd *input_bfd, asection *sec,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Shdr *symtab_hdr,
+ Elf_Internal_Sym *isym,
+ reloc_howto_type *howto)
+{
+ const char *v = "";
+ const char *und = "";
+ const char *pic = "";
+
+ const char *name;
+ if (h)
+ {
+ name = h->root.root.string;
+ 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 && !h->def_dynamic)
+ und = _("undefined ");
+ }
+ else
+ {
+ name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
+ pic = _("; recompile with -fPIC");
+ }
+
+ _bfd_error_handler (_("%B: relocation %s against %s%s`%s' can "
+ "not be used when making a shared object%s"),
+ input_bfd, howto->name, und, v, name, pic);
+ bfd_set_error (bfd_error_bad_value);
+ sec->check_relocs_failed = 1;
+ return FALSE;
+}
+
+/* With the local symbol, foo, we convert
+ mov foo@GOTPCREL(%rip), %reg
+ to
+ lea foo(%rip), %reg
+ and convert
+ call/jmp *foo@GOTPCREL(%rip)
+ to
+ nop call foo/jmp foo nop
+ When PIC is false, convert
+ test %reg, foo@GOTPCREL(%rip)
+ to
+ test $foo, %reg
+ and convert
+ binop foo@GOTPCREL(%rip), %reg
+ to
+ binop $foo, %reg
+ where binop is one of adc, add, and, cmp, or, sbb, sub, xor
+ instructions. */
+
+static bfd_boolean
+elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
+ bfd_byte *contents,
+ Elf_Internal_Rela *irel,
+ struct elf_link_hash_entry *h,
+ bfd_boolean *converted,
+ struct bfd_link_info *link_info)
+{
+ struct elf_x86_64_link_hash_table *htab;
+ bfd_boolean is_pic;
+ bfd_boolean require_reloc_pc32;
+ bfd_boolean relocx;
+ bfd_boolean to_reloc_pc32;
+ asection *tsec;
+ char symtype;
+ bfd_signed_vma raddend;
+ unsigned int opcode;
+ unsigned int modrm;
+ unsigned int r_type = ELF32_R_TYPE (irel->r_info);
+ unsigned int r_symndx;
+ bfd_vma toff;
+ bfd_vma roff = irel->r_offset;
+
+ if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
+ return TRUE;
+
+ raddend = irel->r_addend;
+ /* Addend for 32-bit PC-relative relocation must be -4. */
+ if (raddend != -4)
+ return TRUE;
+
+ htab = elf_x86_64_hash_table (link_info);
+ is_pic = bfd_link_pic (link_info);
+
+ relocx = (r_type == R_X86_64_GOTPCRELX
+ || r_type == R_X86_64_REX_GOTPCRELX);
+
+ /* TRUE if we can convert only to R_X86_64_PC32. Enable it for
+ --no-relax. */
+ require_reloc_pc32
+ = link_info->disable_target_specific_optimizations > 1;
+
+ r_symndx = htab->r_sym (irel->r_info);
+
+ opcode = bfd_get_8 (abfd, contents + roff - 2);
+
+ /* Convert mov to lea since it has been done for a while. */
+ if (opcode != 0x8b)
+ {
+ /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
+ for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
+ test, xor instructions. */
+ if (!relocx)
+ return TRUE;
+ }
+
+ /* We convert only to R_X86_64_PC32:
+ 1. Branch.
+ 2. R_X86_64_GOTPCREL since we can't modify REX byte.
+ 3. require_reloc_pc32 is true.
+ 4. PIC.
+ */
+ to_reloc_pc32 = (opcode == 0xff
+ || !relocx
+ || require_reloc_pc32
+ || is_pic);
+
+ /* Get the symbol referred to by the reloc. */
+ if (h == NULL)
+ {
+ Elf_Internal_Sym *isym
+ = bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
+
+ /* Skip relocation against undefined symbols. */
+ if (isym->st_shndx == SHN_UNDEF)
+ return TRUE;
+
+ symtype = ELF_ST_TYPE (isym->st_info);
+
+ if (isym->st_shndx == SHN_ABS)
+ tsec = bfd_abs_section_ptr;
+ else if (isym->st_shndx == SHN_COMMON)
+ tsec = bfd_com_section_ptr;
+ else if (isym->st_shndx == SHN_X86_64_LCOMMON)
+ tsec = &_bfd_elf_large_com_section;
+ else
+ tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+
+ toff = isym->st_value;
+ }
+ else
+ {
+ /* Undefined weak symbol is only bound locally in executable
+ and its reference is resolved as 0 without relocation
+ overflow. We can only perform this optimization for
+ GOTPCRELX relocations since we need to modify REX byte.
+ It is OK convert mov with R_X86_64_GOTPCREL to
+ R_X86_64_PC32. */
+ if ((relocx || opcode == 0x8b)
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
+ TRUE,
+ elf_x86_64_hash_entry (h)))
+ {
+ if (opcode == 0xff)
+ {
+ /* Skip for branch instructions since R_X86_64_PC32
+ may overflow. */
+ if (require_reloc_pc32)
+ return TRUE;
+ }
+ else if (relocx)
+ {
+ /* For non-branch instructions, we can convert to
+ R_X86_64_32/R_X86_64_32S since we know if there
+ is a REX byte. */
+ to_reloc_pc32 = FALSE;
+ }
+
+ /* Since we don't know the current PC when PIC is true,
+ we can't convert to R_X86_64_PC32. */
+ if (to_reloc_pc32 && is_pic)
+ return TRUE;
+
+ goto convert;
+ }
+ /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
+ ld.so may use its link-time address. */
+ else if ((h->def_regular
+ || h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && h != htab->elf.hdynamic
+ && SYMBOL_REFERENCES_LOCAL (link_info, h))
+ {
+ /* bfd_link_hash_new or bfd_link_hash_undefined is
+ set by an assignment in a linker script in
+ bfd_elf_record_link_assignment. */
+ if (h->def_regular
+ && (h->root.type == bfd_link_hash_new
+ || h->root.type == bfd_link_hash_undefined))
+ {
+ /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
+ if (require_reloc_pc32)
+ return TRUE;
+ goto convert;
+ }
+ tsec = h->root.u.def.section;
+ toff = h->root.u.def.value;
+ symtype = h->type;
+ }
+ else
+ return TRUE;
+ }
+
+ /* Don't convert GOTPCREL relocation against large section. */
+ if (elf_section_data (tsec) != NULL
+ && (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
+ return TRUE;
+
+ /* We can only estimate relocation overflow for R_X86_64_PC32. */
+ if (!to_reloc_pc32)
+ goto convert;
+
+ if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
+ {
+ /* At this stage in linking, no SEC_MERGE symbol has been
+ adjusted, so all references to such symbols need to be
+ passed through _bfd_merged_section_offset. (Later, in
+ relocate_section, all SEC_MERGE symbols *except* for
+ section symbols have been adjusted.)
+
+ gas may reduce relocations against symbols in SEC_MERGE
+ sections to a relocation against the section symbol when
+ the original addend was zero. When the reloc is against
+ a section symbol we should include the addend in the
+ offset passed to _bfd_merged_section_offset, since the
+ location of interest is the original symbol. On the
+ other hand, an access to "sym+addend" where "sym" is not
+ a section symbol should not include the addend; Such an
+ access is presumed to be an offset from "sym"; The
+ location of interest is just "sym". */
+ if (symtype == STT_SECTION)
+ toff += raddend;
+
+ toff = _bfd_merged_section_offset (abfd, &tsec,
+ elf_section_data (tsec)->sec_info,
+ toff);
+
+ if (symtype != STT_SECTION)
+ toff += raddend;
+ }
+ else
+ toff += raddend;
+
+ /* Don't convert if R_X86_64_PC32 relocation overflows. */
+ if (tsec->output_section == sec->output_section)
+ {
+ if ((toff - roff + 0x80000000) > 0xffffffff)
+ return TRUE;
+ }
+ else
+ {
+ bfd_signed_vma distance;
+
+ /* At this point, we don't know the load addresses of TSEC
+ section nor SEC section. We estimate the distrance between
+ SEC and TSEC. We store the estimated distances in the
+ compressed_size field of the output section, which is only
+ used to decompress the compressed input section. */
+ if (sec->output_section->compressed_size == 0)
+ {
+ asection *asect;
+ bfd_size_type size = 0;
+ for (asect = link_info->output_bfd->sections;
+ asect != NULL;
+ asect = asect->next)
+ /* Skip debug sections since compressed_size is used to
+ compress debug sections. */
+ if ((asect->flags & SEC_DEBUGGING) == 0)
+ {
+ asection *i;
+ for (i = asect->map_head.s;
+ i != NULL;
+ i = i->map_head.s)
+ {
+ size = align_power (size, i->alignment_power);
+ size += i->size;
+ }
+ asect->compressed_size = size;
+ }
+ }
+
+ /* Don't convert GOTPCREL relocations if TSEC isn't placed
+ after SEC. */
+ distance = (tsec->output_section->compressed_size
+ - sec->output_section->compressed_size);
+ if (distance < 0)
+ return TRUE;
+
+ /* Take PT_GNU_RELRO segment into account by adding
+ maxpagesize. */
+ if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
+ - roff + 0x80000000) > 0xffffffff)
+ return TRUE;
+ }
+
+convert:
+ if (opcode == 0xff)
+ {
+ /* We have "call/jmp *foo@GOTPCREL(%rip)". */
+ unsigned int nop;
+ unsigned int disp;
+ bfd_vma nop_offset;
+
+ /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
+ R_X86_64_PC32. */
+ modrm = bfd_get_8 (abfd, contents + roff - 1);
+ if (modrm == 0x25)
+ {
+ /* Convert to "jmp foo nop". */
+ modrm = 0xe9;
+ nop = NOP_OPCODE;
+ nop_offset = irel->r_offset + 3;
+ disp = bfd_get_32 (abfd, contents + irel->r_offset);
+ irel->r_offset -= 1;
+ bfd_put_32 (abfd, disp, contents + irel->r_offset);
+ }
+ else
+ {
+ struct elf_x86_64_link_hash_entry *eh
+ = (struct elf_x86_64_link_hash_entry *) h;
+
+ /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
+ is a nop prefix. */
+ modrm = 0xe8;
+ /* To support TLS optimization, always use addr32 prefix for
+ "call *__tls_get_addr@GOTPCREL(%rip)". */
+ if (eh && eh->tls_get_addr == 1)
+ {
+ nop = 0x67;
+ nop_offset = irel->r_offset - 2;
+ }
+ else
+ {
+ nop = link_info->call_nop_byte;
+ if (link_info->call_nop_as_suffix)
+ {
+ nop_offset = irel->r_offset + 3;
+ disp = bfd_get_32 (abfd, contents + irel->r_offset);
+ irel->r_offset -= 1;
+ bfd_put_32 (abfd, disp, contents + irel->r_offset);
+ }
+ else
+ nop_offset = irel->r_offset - 2;
+ }
+ }
+ bfd_put_8 (abfd, nop, contents + nop_offset);
+ bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
+ r_type = R_X86_64_PC32;
+ }
+ else
+ {
+ unsigned int rex;
+ unsigned int rex_mask = REX_R;
+
+ if (r_type == R_X86_64_REX_GOTPCRELX)
+ rex = bfd_get_8 (abfd, contents + roff - 3);
+ else
+ rex = 0;
+
+ if (opcode == 0x8b)
+ {
+ if (to_reloc_pc32)
+ {
+ /* Convert "mov foo@GOTPCREL(%rip), %reg" to
+ "lea foo(%rip), %reg". */
+ opcode = 0x8d;
+ r_type = R_X86_64_PC32;
+ }
+ else
+ {
+ /* Convert "mov foo@GOTPCREL(%rip), %reg" to
+ "mov $foo, %reg". */
+ opcode = 0xc7;
+ modrm = bfd_get_8 (abfd, contents + roff - 1);
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ if ((rex & REX_W) != 0
+ && ABI_64_P (link_info->output_bfd))
+ {
+ /* Keep the REX_W bit in REX byte for LP64. */
+ r_type = R_X86_64_32S;
+ goto rewrite_modrm_rex;
+ }
+ else
+ {
+ /* If the REX_W bit in REX byte isn't needed,
+ use R_X86_64_32 and clear the W bit to avoid
+ sign-extend imm32 to imm64. */
+ r_type = R_X86_64_32;
+ /* Clear the W bit in REX byte. */
+ rex_mask |= REX_W;
+ goto rewrite_modrm_rex;
+ }
+ }
+ }
+ else
+ {
+ /* R_X86_64_PC32 isn't supported. */
+ if (to_reloc_pc32)
+ return TRUE;
+
+ modrm = bfd_get_8 (abfd, contents + roff - 1);
+ if (opcode == 0x85)
+ {
+ /* Convert "test %reg, foo@GOTPCREL(%rip)" to
+ "test $foo, %reg". */
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ opcode = 0xf7;
+ }
+ else
+ {
+ /* Convert "binop foo@GOTPCREL(%rip), %reg" to
+ "binop $foo, %reg". */
+ modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
+ opcode = 0x81;
+ }
+
+ /* Use R_X86_64_32 with 32-bit operand to avoid relocation
+ overflow when sign-extending imm32 to imm64. */
+ r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
+
+rewrite_modrm_rex:
+ bfd_put_8 (abfd, modrm, contents + roff - 1);
+
+ if (rex)
+ {
+ /* Move the R bit to the B bit in REX byte. */
+ rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
+ bfd_put_8 (abfd, rex, contents + roff - 3);
+ }
+
+ /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
+ irel->r_addend = 0;
+ }
+
+ bfd_put_8 (abfd, opcode, contents + roff - 2);
+ }
+
+ irel->r_info = htab->r_info (r_symndx, r_type);
+
+ *converted = TRUE;
+
+ return TRUE;
+}
/* Look through the relocs for a section during the first phase, and
calculate needed space in the global offset table, procedure
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
asection *sreloc;
+ bfd_byte *contents;
bfd_boolean use_plt_got;
- if (info->relocatable)
+ if (bfd_link_relocatable (info))
+ return TRUE;
+
+ /* Don't do anything special with non-loaded, non-alloced sections.
+ In particular, any relocs in such sections should not affect GOT
+ and PLT reference counting (ie. we don't allow them to create GOT
+ or PLT entries), there's no possibility or desire to optimize TLS
+ relocs, and there's not much point in propagating relocs to shared
+ libs that the dynamic linker won't relocate. */
+ if ((sec->flags & SEC_ALLOC) == 0)
return TRUE;
BFD_ASSERT (is_x86_64_elf (abfd));
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
- return FALSE;
+ {
+ sec->check_relocs_failed = 1;
+ return FALSE;
+ }
+
+ /* Get the section contents. */
+ if (elf_section_data (sec)->this_hdr.contents != NULL)
+ contents = elf_section_data (sec)->this_hdr.contents;
+ else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
+ {
+ sec->check_relocs_failed = 1;
+ return FALSE;
+ }
use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
unsigned int r_type;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
+ struct elf_x86_64_link_hash_entry *eh;
Elf_Internal_Sym *isym;
const char *name;
bfd_boolean size_reloc;
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
- (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
- abfd, r_symndx);
- return FALSE;
+ _bfd_error_handler (_("%B: bad symbol index: %d"),
+ abfd, r_symndx);
+ goto error_return;
}
if (r_symndx < symtab_hdr->sh_info)
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
- return FALSE;
+ goto error_return;
/* Check relocation against local STT_GNU_IFUNC symbol. */
if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
TRUE);
if (h == NULL)
- return FALSE;
+ goto error_return;
/* Fake a STT_GNU_IFUNC symbol. */
h->type = STT_GNU_IFUNC;
else
name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation %s against symbol `%s' isn't "
"supported in x32 mode"), abfd,
x86_64_elf_howto_table[r_type].name, name);
bfd_set_error (bfd_error_bad_value);
- return FALSE;
+ goto error_return;
}
break;
}
if (h != NULL)
{
- /* Create the ifunc sections for static executables. If we
- never see an indirect function symbol nor we are building
- a static executable, those sections will be empty and
- won't appear in output. */
switch (r_type)
{
default:
|| !bfd_set_section_alignment (htab->elf.dynobj,
htab->plt_bnd,
plt_bnd_align))
- return FALSE;
+ goto error_return;
}
}
+ /* Fall through. */
case R_X86_64_32S:
case R_X86_64_PC64:
case R_X86_64_GOTPCREL:
+ case R_X86_64_GOTPCRELX:
+ case R_X86_64_REX_GOTPCRELX:
case R_X86_64_GOTPCREL64:
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
- if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
- return FALSE;
+ /* Create the ifunc sections for static executables. */
+ if (h->type == STT_GNU_IFUNC
+ && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
+ info))
+ goto error_return;
break;
}
/* It is referenced by a non-shared object. */
h->ref_regular = 1;
h->root.non_ir_ref = 1;
+
+ if (h->type == STT_GNU_IFUNC)
+ elf_tdata (info->output_bfd)->has_gnu_symbols
+ |= elf_gnu_symbol_ifunc;
}
- if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
+ if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
symtab_hdr, sym_hashes,
&r_type, GOT_UNKNOWN,
- rel, rel_end, h, r_symndx))
- return FALSE;
+ rel, rel_end, h, r_symndx, FALSE))
+ goto error_return;
+ eh = (struct elf_x86_64_link_hash_entry *) h;
switch (r_type)
{
case R_X86_64_TLSLD:
goto create_got;
case R_X86_64_TPOFF32:
- if (!info->executable && ABI_64_P (abfd))
- {
- if (h)
- name = h->root.root.string;
- else
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
- NULL);
- (*_bfd_error_handler)
- (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
- abfd,
- x86_64_elf_howto_table[r_type].name, name);
- bfd_set_error (bfd_error_bad_value);
- return FALSE;
- }
+ if (!bfd_link_executable (info) && ABI_64_P (abfd))
+ return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
+ &x86_64_elf_howto_table[r_type]);
+ if (eh != NULL)
+ eh->has_got_reloc = 1;
break;
case R_X86_64_GOTTPOFF:
- if (!info->executable)
+ if (!bfd_link_executable (info))
info->flags |= DF_STATIC_TLS;
/* Fall through */
case R_X86_64_GOT32:
case R_X86_64_GOTPCREL:
+ case R_X86_64_GOTPCRELX:
+ case R_X86_64_REX_GOTPCRELX:
case R_X86_64_TLSGD:
case R_X86_64_GOT64:
case R_X86_64_GOTPCREL64:
if (h != NULL)
{
h->got.refcount += 1;
- old_tls_type = elf_x86_64_hash_entry (h)->tls_type;
+ old_tls_type = eh->tls_type;
}
else
{
local_got_refcounts = ((bfd_signed_vma *)
bfd_zalloc (abfd, size));
if (local_got_refcounts == NULL)
- return FALSE;
+ goto error_return;
elf_local_got_refcounts (abfd) = local_got_refcounts;
elf_x86_64_local_tlsdesc_gotent (abfd)
= (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
else
name = bfd_elf_sym_name (abfd, symtab_hdr,
isym, NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: '%s' accessed both as normal and thread local symbol"),
abfd, name);
bfd_set_error (bfd_error_bad_value);
- return FALSE;
+ goto error_return;
}
}
if (old_tls_type != tls_type)
{
- if (h != NULL)
- elf_x86_64_hash_entry (h)->tls_type = tls_type;
+ if (eh != NULL)
+ eh->tls_type = tls_type;
else
elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
}
case R_X86_64_GOTPC32:
case R_X86_64_GOTPC64:
create_got:
+ if (eh != NULL)
+ eh->has_got_reloc = 1;
if (htab->elf.sgot == NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!_bfd_elf_create_got_section (htab->elf.dynobj,
info))
- return FALSE;
+ goto error_return;
}
break;
if (h == NULL)
continue;
+ eh->has_got_reloc = 1;
h->needs_plt = 1;
h->plt.refcount += 1;
break;
case R_X86_64_32:
if (!ABI_64_P (abfd))
goto pointer;
+ /* Fall through. */
case R_X86_64_8:
case R_X86_64_16:
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
+ /* Check relocation overflow as these relocs may lead to
+ run-time relocation overflow. 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)
- {
- if (h)
- name = h->root.root.string;
- else
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
- (*_bfd_error_handler)
- (_("%B: relocation %s against `%s' can not be used when making a shared object; recompile with -fPIC"),
- abfd, x86_64_elf_howto_table[r_type].name, name);
- bfd_set_error (bfd_error_bad_value);
- return FALSE;
- }
+ when relocation overflow check is disabled. */
+ if (!info->no_reloc_overflow_check
+ && (bfd_link_pic (info)
+ || (bfd_link_executable (info)
+ && h != NULL
+ && !h->def_regular
+ && h->def_dynamic
+ && (sec->flags & SEC_READONLY) == 0)))
+ return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
+ &x86_64_elf_howto_table[r_type]);
/* Fall through. */
case R_X86_64_PC8:
case R_X86_64_PC64:
case R_X86_64_64:
pointer:
- if (h != NULL && info->executable)
+ if (eh != NULL && (sec->flags & SEC_CODE) != 0)
+ eh->has_non_got_reloc = 1;
+ /* We are called after all symbols have been resolved. Only
+ relocation against STT_GNU_IFUNC symbol must go through
+ PLT. */
+ if (h != NULL
+ && (bfd_link_executable (info)
+ || h->type == STT_GNU_IFUNC))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this
adjust_dynamic_symbol. */
h->non_got_ref = 1;
- /* We may need a .plt entry if the function this reloc
- refers to is in a shared lib. */
- h->plt.refcount += 1;
- if (r_type != R_X86_64_PC32
- && r_type != R_X86_64_PC32_BND
- && r_type != R_X86_64_PC64)
- h->pointer_equality_needed = 1;
+ /* We may need a .plt entry if the symbol is a function
+ defined in a shared lib or is a STT_GNU_IFUNC function
+ referenced from the code or read-only section. */
+ if (!h->def_regular
+ || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
+ h->plt.refcount += 1;
+
+ if (r_type == R_X86_64_PC32)
+ {
+ /* Since something like ".long foo - ." may be used
+ as pointer, make sure that PLT is used if foo is
+ a function defined in a shared library. */
+ if ((sec->flags & SEC_CODE) == 0)
+ h->pointer_equality_needed = 1;
+ }
+ else if (r_type != R_X86_64_PC32_BND
+ && r_type != R_X86_64_PC64)
+ {
+ h->pointer_equality_needed = 1;
+ /* At run-time, R_X86_64_64 can be resolved for both
+ x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
+ can only be resolved for x32. */
+ if ((sec->flags & SEC_READONLY) == 0
+ && (r_type == R_X86_64_64
+ || (!ABI_64_P (abfd)
+ && (r_type == R_X86_64_32
+ || r_type == R_X86_64_32S))))
+ eh->func_pointer_refcount += 1;
+ }
}
size_reloc = FALSE;
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
+ symbol.
+
+ Generate dynamic pointer relocation against STT_GNU_IFUNC
+ symbol in the non-code section. */
+ if ((bfd_link_pic (info)
&& (! IS_X86_64_PCREL_TYPE (r_type)
|| (h != NULL
- && (! SYMBOLIC_BIND (info, h)
+ && (! (bfd_link_pie (info)
+ || SYMBOLIC_BIND (info, h))
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
+ || (h != NULL
+ && h->type == STT_GNU_IFUNC
+ && r_type == htab->pointer_r_type
+ && (sec->flags & SEC_CODE) == 0)
|| (ELIMINATE_COPY_RELOCS
- && !info->shared
- && (sec->flags & SEC_ALLOC) != 0
+ && !bfd_link_pic (info)
&& h != NULL
&& (h->root.type == bfd_link_hash_defweak
|| !h->def_regular)))
abfd, /*rela?*/ TRUE);
if (sreloc == NULL)
- return FALSE;
+ goto error_return;
}
/* If this is a global symbol, we count the number of
relocations we need for this symbol. */
if (h != NULL)
- {
- head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs;
- }
+ head = &eh->dyn_relocs;
else
{
/* Track dynamic relocs needed for local syms too.
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
- return FALSE;
+ goto error_return;
s = bfd_section_from_elf_index (abfd, isym->st_shndx);
if (s == NULL)
p = ((struct elf_dyn_relocs *)
bfd_alloc (htab->elf.dynobj, amt));
if (p == NULL)
- return FALSE;
+ goto error_return;
p->next = *head;
*head = p;
p->sec = sec;
Reconstruct it for later use during GC. */
case R_X86_64_GNU_VTINHERIT:
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
- return FALSE;
+ goto error_return;
break;
/* This relocation describes which C++ vtable entries are actually
BFD_ASSERT (h != NULL);
if (h != NULL
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
- return FALSE;
+ goto error_return;
break;
default:
if (use_plt_got
&& h != NULL
&& h->plt.refcount > 0
- && ((info->flags & DF_BIND_NOW) || h->got.refcount > 0)
+ && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
+ || h->got.refcount > 0)
&& htab->plt_got == NULL)
{
/* Create the GOT procedure linkage table. */
|| !bfd_set_section_alignment (htab->elf.dynobj,
htab->plt_got,
plt_got_align))
- return FALSE;
+ goto error_return;
}
- if (r_type == R_X86_64_GOTPCREL
+ if ((r_type == R_X86_64_GOTPCREL
+ || r_type == R_X86_64_GOTPCRELX
+ || r_type == R_X86_64_REX_GOTPCRELX)
&& (h == NULL || h->type != STT_GNU_IFUNC))
- sec->need_convert_mov_to_lea = 1;
+ sec->need_convert_load = 1;
}
- return TRUE;
-}
-
-/* Return the section that should be marked against GC for a given
- relocation. */
-
+ if (elf_section_data (sec)->this_hdr.contents != contents)
+ {
+ if (!info->keep_memory)
+ free (contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+ }
+
+ return TRUE;
+
+error_return:
+ if (elf_section_data (sec)->this_hdr.contents != contents)
+ free (contents);
+ sec->check_relocs_failed = 1;
+ return FALSE;
+}
+
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
static asection *
elf_x86_64_gc_mark_hook (asection *sec,
struct bfd_link_info *info,
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
-/* Update the got entry reference counts for the section being removed. */
+/* Remove undefined weak symbol from the dynamic symbol table if it
+ is resolved to 0. */
static bfd_boolean
-elf_x86_64_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
+elf_x86_64_fixup_symbol (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h)
{
- struct elf_x86_64_link_hash_table *htab;
- Elf_Internal_Shdr *symtab_hdr;
- struct elf_link_hash_entry **sym_hashes;
- bfd_signed_vma *local_got_refcounts;
- const Elf_Internal_Rela *rel, *relend;
-
- if (info->relocatable)
- return TRUE;
-
- htab = elf_x86_64_hash_table (info);
- if (htab == NULL)
- return FALSE;
-
- elf_section_data (sec)->local_dynrel = NULL;
-
- symtab_hdr = &elf_symtab_hdr (abfd);
- sym_hashes = elf_sym_hashes (abfd);
- local_got_refcounts = elf_local_got_refcounts (abfd);
-
- htab = elf_x86_64_hash_table (info);
- relend = relocs + sec->reloc_count;
- for (rel = relocs; rel < relend; rel++)
+ if (h->dynindx != -1
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ elf_x86_64_hash_entry (h)->has_got_reloc,
+ elf_x86_64_hash_entry (h)))
{
- unsigned long r_symndx;
- unsigned int r_type;
- struct elf_link_hash_entry *h = NULL;
-
- r_symndx = htab->r_sym (rel->r_info);
- if (r_symndx >= symtab_hdr->sh_info)
- {
- 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;
- }
- else
- {
- /* A local symbol. */
- Elf_Internal_Sym *isym;
-
- isym = bfd_sym_from_r_symndx (&htab->sym_cache,
- abfd, r_symndx);
-
- /* Check relocation against local STT_GNU_IFUNC symbol. */
- if (isym != NULL
- && ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
- {
- h = elf_x86_64_get_local_sym_hash (htab, abfd, rel, FALSE);
- if (h == NULL)
- abort ();
- }
- }
-
- if (h)
- {
- struct elf_x86_64_link_hash_entry *eh;
- struct elf_dyn_relocs **pp;
- struct elf_dyn_relocs *p;
-
- eh = (struct elf_x86_64_link_hash_entry *) h;
-
- for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
- if (p->sec == sec)
- {
- /* Everything must go for SEC. */
- *pp = p->next;
- break;
- }
- }
-
- r_type = ELF32_R_TYPE (rel->r_info);
- if (! elf_x86_64_tls_transition (info, abfd, sec, NULL,
- symtab_hdr, sym_hashes,
- &r_type, GOT_UNKNOWN,
- rel, relend, h, r_symndx))
- return FALSE;
-
- switch (r_type)
- {
- case R_X86_64_TLSLD:
- if (htab->tls_ld_got.refcount > 0)
- htab->tls_ld_got.refcount -= 1;
- break;
-
- case R_X86_64_TLSGD:
- case R_X86_64_GOTPC32_TLSDESC:
- case R_X86_64_TLSDESC_CALL:
- case R_X86_64_GOTTPOFF:
- case R_X86_64_GOT32:
- case R_X86_64_GOTPCREL:
- case R_X86_64_GOT64:
- case R_X86_64_GOTPCREL64:
- case R_X86_64_GOTPLT64:
- if (h != NULL)
- {
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- if (h->type == STT_GNU_IFUNC)
- {
- if (h->plt.refcount > 0)
- h->plt.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:
- case R_X86_64_PC32_BND:
- case R_X86_64_PC64:
- case R_X86_64_SIZE32:
- case R_X86_64_SIZE64:
- if (info->shared
- && (h == NULL || h->type != STT_GNU_IFUNC))
- break;
- /* Fall thru */
-
- case R_X86_64_PLT32:
- case R_X86_64_PLT32_BND:
- case R_X86_64_PLTOFF64:
- if (h != NULL)
- {
- if (h->plt.refcount > 0)
- h->plt.refcount -= 1;
- }
- break;
-
- default:
- break;
- }
+ h->dynindx = -1;
+ _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
+ h->dynstr_index);
}
-
return TRUE;
}
if (pc_count || count)
{
- h->needs_plt = 1;
h->non_got_ref = 1;
- if (h->plt.refcount <= 0)
- h->plt.refcount = 1;
- else
- h->plt.refcount += 1;
+ if (pc_count)
+ {
+ /* Increment PLT reference count only for PC-relative
+ references. */
+ h->needs_plt = 1;
+ if (h->plt.refcount <= 0)
+ h->plt.refcount = 1;
+ else
+ h->plt.refcount += 1;
+ }
}
}
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->executable)
+ if (!bfd_link_executable (info))
return TRUE;
/* If there are no references to this symbol that do not use the
struct elf_dyn_relocs *p;
const struct elf_backend_data *bed;
unsigned int plt_entry_size;
+ bfd_boolean resolved_to_zero;
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
bed = get_elf_backend_data (info->output_bfd);
plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
+ resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh->has_got_reloc,
+ eh);
+
/* We can't use the GOT PLT if pointer equality is needed since
finish_dynamic_symbol won't clear symbol value and the dynamic
linker won't update the GOT slot. We will get into an infinite
eh->plt_got.refcount = 1;
}
+ /* Clear the reference count of function pointer relocations if
+ symbol isn't a normal function. */
+ if (h->type != STT_FUNC)
+ eh->func_pointer_refcount = 0;
+
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
here if it is defined and referenced in a non-shared object. */
if (h->type == STT_GNU_IFUNC
{
if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h,
&eh->dyn_relocs,
+ &htab->readonly_dynrelocs_against_ifunc,
plt_entry_size,
plt_entry_size,
- GOT_ENTRY_SIZE))
+ GOT_ENTRY_SIZE, TRUE))
{
asection *s = htab->plt_bnd;
if (h->plt.offset != (bfd_vma) -1 && s != NULL)
else
return FALSE;
}
+ /* Don't create the PLT entry if there are only function pointer
+ relocations which can be resolved at run-time. */
else if (htab->elf.dynamic_sections_created
- && (h->plt.refcount > 0 || eh->plt_got.refcount > 0))
+ && (h->plt.refcount > eh->func_pointer_refcount
+ || eh->plt_got.refcount > 0))
{
bfd_boolean use_plt_got;
- if ((info->flags & DF_BIND_NOW))
+ /* Clear the reference count of function pointer relocations
+ if PLT is used. */
+ eh->func_pointer_refcount = 0;
+
+ if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
{
/* Don't use the regular PLT for DF_BIND_NOW. */
h->plt.offset = (bfd_vma) -1;
/* Make sure this symbol is output as a dynamic symbol.
Undefined weak syms won't yet be marked as dynamic. */
if (h->dynindx == -1
- && !h->forced_local)
+ && !h->forced_local
+ && !resolved_to_zero)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
- if (info->shared
+ if (bfd_link_pic (info)
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
{
asection *s = htab->elf.splt;
asection *bnd_s = htab->plt_bnd;
asection *got_s = htab->plt_got;
+ /* If this is the first .plt entry, make room for the special
+ first entry. The .plt section is used by prelink to undo
+ prelinking for dynamic relocations. */
+ if (s->size == 0)
+ s->size = plt_entry_size;
+
if (use_plt_got)
eh->plt_got.offset = got_s->size;
else
{
- /* If this is the first .plt entry, make room for the
- special first entry. */
- if (s->size == 0)
- s->size = plt_entry_size;
h->plt.offset = s->size;
if (bnd_s)
eh->plt_bnd.offset = bnd_s->size;
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
+ if (! bfd_link_pic (info)
&& !h->def_regular)
{
if (use_plt_got)
script. */
htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
- /* We also need to make an entry in the .rela.plt
- section. */
- htab->elf.srelplt->size += bed->s->sizeof_rela;
- htab->elf.srelplt->reloc_count++;
+ /* There should be no PLT relocation against resolved
+ undefined weak symbol in executable. */
+ if (!resolved_to_zero)
+ {
+ /* We also need to make an entry in the .rela.plt
+ section. */
+ htab->elf.srelplt->size += bed->s->sizeof_rela;
+ htab->elf.srelplt->reloc_count++;
+ }
}
}
else
{
+ eh->plt_got.offset = (bfd_vma) -1;
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
}
}
else
{
+ eh->plt_got.offset = (bfd_vma) -1;
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
}
/* If R_X86_64_GOTTPOFF symbol is now local to the binary,
make it a R_X86_64_TPOFF32 requiring no GOT entry. */
if (h->got.refcount > 0
- && info->executable
+ && bfd_link_executable (info)
&& h->dynindx == -1
&& elf_x86_64_hash_entry (h)->tls_type == GOT_TLS_IE)
{
/* Make sure this symbol is output as a dynamic symbol.
Undefined weak syms won't yet be marked as dynamic. */
if (h->dynindx == -1
- && !h->forced_local)
+ && !h->forced_local
+ && !resolved_to_zero)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
dyn = htab->elf.dynamic_sections_created;
/* R_X86_64_TLSGD needs one dynamic relocation if local symbol
- and two if global.
- R_X86_64_GOTTPOFF needs one dynamic relocation. */
+ and two if global. R_X86_64_GOTTPOFF needs one dynamic
+ relocation. No dynamic relocation against resolved undefined
+ weak symbol in executable. */
if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
|| tls_type == GOT_TLS_IE)
htab->elf.srelgot->size += bed->s->sizeof_rela;
else if (GOT_TLS_GD_P (tls_type))
htab->elf.srelgot->size += 2 * bed->s->sizeof_rela;
else if (! GOT_TLS_GDESC_P (tls_type)
- && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ && !resolved_to_zero)
|| h->root.type != bfd_link_hash_undefweak)
- && (info->shared
+ && (bfd_link_pic (info)
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
htab->elf.srelgot->size += bed->s->sizeof_rela;
if (GOT_TLS_GDESC_P (tls_type))
space for pc-relative relocs that have become local due to symbol
visibility changes. */
- if (info->shared)
+ if (bfd_link_pic (info))
{
/* Relocs that use pc_count are those that appear on a call
insn, or certain REL relocs that can generated via assembly.
}
/* Also discard relocs on undefined weak syms with non-default
- visibility. */
+ visibility or in PIE. */
if (eh->dyn_relocs != NULL)
{
if (h->root.type == bfd_link_hash_undefweak)
{
- if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
+ /* Undefined weak symbol is never bound locally in shared
+ library. */
+ if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+ || resolved_to_zero)
eh->dyn_relocs = NULL;
-
- /* Make sure undefined weak symbols are output as a dynamic
- symbol in PIEs. */
else if (h->dynindx == -1
&& ! h->forced_local
&& ! bfd_elf_link_record_dynamic_symbol (info, h))
}
/* For PIE, discard space for pc-relative relocs against
symbols which turn out to need copy relocs. */
- else if (info->executable
+ else if (bfd_link_executable (info)
&& (h->needs_copy || eh->needs_copy)
&& h->def_dynamic
&& !h->def_regular)
{
/* For the non-shared case, discard space for relocs against
symbols which turn out to need copy relocs or are not
- dynamic. */
+ dynamic. Keep dynamic relocations for run-time function
+ pointer initialization. */
- if (!h->non_got_ref
+ if ((!h->non_got_ref
+ || eh->func_pointer_refcount > 0
+ || (h->root.type == bfd_link_hash_undefweak
+ && !resolved_to_zero))
&& ((h->def_dynamic
&& !h->def_regular)
|| (htab->elf.dynamic_sections_created
Undefined weak syms won't yet be marked as dynamic. */
if (h->dynindx == -1
&& ! h->forced_local
+ && ! resolved_to_zero
&& ! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
eh->dyn_relocs = NULL;
+ eh->func_pointer_refcount = 0;
keep: ;
}
info->flags |= DF_TEXTREL;
- if ((info->warn_shared_textrel && info->shared)
+ if ((info->warn_shared_textrel && bfd_link_pic (info))
|| info->error_textrel)
info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
p->sec->owner, h->root.root.string,
return TRUE;
}
-/* Convert
- mov foo@GOTPCREL(%rip), %reg
- to
- lea foo(%rip), %reg
- with the local symbol, foo. */
+/* Convert load via the GOT slot to load immediate. */
static bfd_boolean
-elf_x86_64_convert_mov_to_lea (bfd *abfd, asection *sec,
- struct bfd_link_info *link_info)
+elf_x86_64_convert_load (bfd *abfd, asection *sec,
+ struct bfd_link_info *link_info)
{
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *contents;
struct elf_x86_64_link_hash_table *htab;
- bfd_boolean changed_contents;
- bfd_boolean changed_relocs;
+ bfd_boolean changed;
bfd_signed_vma *local_got_refcounts;
/* Don't even try to convert non-ELF outputs. */
/* Nothing to do if there is no need or no output. */
if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
- || sec->need_convert_mov_to_lea == 0
+ || sec->need_convert_load == 0
|| bfd_is_abs_section (sec->output_section))
return TRUE;
if (internal_relocs == NULL)
return FALSE;
+ changed = FALSE;
htab = elf_x86_64_hash_table (link_info);
- changed_contents = FALSE;
- changed_relocs = FALSE;
local_got_refcounts = elf_local_got_refcounts (abfd);
/* Get the section contents. */
for (irel = internal_relocs; irel < irelend; irel++)
{
unsigned int r_type = ELF32_R_TYPE (irel->r_info);
- unsigned int r_symndx = htab->r_sym (irel->r_info);
- unsigned int indx;
+ unsigned int r_symndx;
struct elf_link_hash_entry *h;
+ bfd_boolean converted;
- if (r_type != R_X86_64_GOTPCREL)
+ if (r_type != R_X86_64_GOTPCRELX
+ && r_type != R_X86_64_REX_GOTPCRELX
+ && r_type != R_X86_64_GOTPCREL)
continue;
- /* Get the symbol referred to by the reloc. */
+ r_symndx = htab->r_sym (irel->r_info);
if (r_symndx < symtab_hdr->sh_info)
+ h = elf_x86_64_get_local_sym_hash (htab, sec->owner,
+ (const Elf_Internal_Rela *) irel,
+ FALSE);
+ else
{
- Elf_Internal_Sym *isym;
+ h = elf_sym_hashes (abfd)[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;
+ }
- isym = bfd_sym_from_r_symndx (&htab->sym_cache,
- abfd, r_symndx);
+ /* STT_GNU_IFUNC must keep GOTPCREL relocations. */
+ if (h != NULL && h->type == STT_GNU_IFUNC)
+ continue;
+
+ converted = FALSE;
+ if (!elf_x86_64_convert_load_reloc (abfd, sec, contents, irel, h,
+ &converted, link_info))
+ goto error_return;
- /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. */
- if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
- && irel->r_offset >= 2
- && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
+ if (converted)
+ {
+ changed = converted;
+ if (h)
+ {
+ if (h->got.refcount > 0)
+ h->got.refcount -= 1;
+ }
+ else
{
- bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
- irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
if (local_got_refcounts != NULL
&& local_got_refcounts[r_symndx] > 0)
local_got_refcounts[r_symndx] -= 1;
- changed_contents = TRUE;
- changed_relocs = TRUE;
}
- continue;
- }
-
- indx = r_symndx - symtab_hdr->sh_info;
- h = elf_sym_hashes (abfd)[indx];
- BFD_ASSERT (h != NULL);
-
- 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;
-
- /* STT_GNU_IFUNC must keep R_X86_64_GOTPCREL relocation. We also
- avoid optimizing _DYNAMIC since ld.so may use its link-time
- address. */
- if (h->def_regular
- && h->type != STT_GNU_IFUNC
- && h != htab->elf.hdynamic
- && SYMBOL_REFERENCES_LOCAL (link_info, h)
- && irel->r_offset >= 2
- && bfd_get_8 (abfd, contents + irel->r_offset - 2) == 0x8b)
- {
- bfd_put_8 (abfd, 0x8d, contents + irel->r_offset - 2);
- irel->r_info = htab->r_info (r_symndx, R_X86_64_PC32);
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- changed_contents = TRUE;
- changed_relocs = TRUE;
}
}
if (contents != NULL
&& elf_section_data (sec)->this_hdr.contents != contents)
{
- if (!changed_contents && !link_info->keep_memory)
+ if (!changed && !link_info->keep_memory)
free (contents);
else
{
if (elf_section_data (sec)->relocs != internal_relocs)
{
- if (!changed_relocs)
+ if (!changed)
free (internal_relocs);
else
elf_section_data (sec)->relocs = internal_relocs;
if (dynobj == NULL)
abort ();
- if (htab->elf.dynamic_sections_created)
- {
- /* Set the contents of the .interp section to the interpreter. */
- if (info->executable)
- {
- s = bfd_get_linker_section (dynobj, ".interp");
- if (s == NULL)
- abort ();
- s->size = htab->dynamic_interpreter_size;
- s->contents = (unsigned char *) htab->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)
{
struct elf_dyn_relocs *p;
- if (!elf_x86_64_convert_mov_to_lea (ibfd, s, info))
+ if (!elf_x86_64_convert_load (ibfd, s, info))
return FALSE;
for (p = (struct elf_dyn_relocs *)
&& (info->flags & DF_TEXTREL) == 0)
{
info->flags |= DF_TEXTREL;
- if ((info->warn_shared_textrel && info->shared)
+ if ((info->warn_shared_textrel && bfd_link_pic (info))
|| info->error_textrel)
info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
p->sec->owner, p->sec);
if (GOT_TLS_GD_P (*local_tls_type))
s->size += GOT_ENTRY_SIZE;
}
- if (info->shared
+ if (bfd_link_pic (info)
|| GOT_TLS_GD_ANY_P (*local_tls_type)
|| *local_tls_type == GOT_TLS_IE)
{
#define add_dynamic_entry(TAG, VAL) \
_bfd_elf_add_dynamic_entry (info, TAG, VAL)
- if (info->executable)
+ if (bfd_link_executable (info))
{
if (!add_dynamic_entry (DT_DEBUG, 0))
return FALSE;
if (htab->elf.splt->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))
+ /* DT_PLTGOT is used by prelink even if there is no PLT
+ relocation. */
+ if (!add_dynamic_entry (DT_PLTGOT, 0))
return FALSE;
+ if (htab->elf.srelplt->size != 0)
+ {
+ if (!add_dynamic_entry (DT_PLTRELSZ, 0)
+ || !add_dynamic_entry (DT_PLTREL, DT_RELA)
+ || !add_dynamic_entry (DT_JMPREL, 0))
+ return FALSE;
+ }
+
if (htab->tlsdesc_plt
&& (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
|| !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
if ((info->flags & DF_TEXTREL) != 0)
{
+ if (htab->readonly_dynrelocs_against_ifunc)
+ {
+ info->callbacks->einfo
+ (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
if (!add_dynamic_entry (DT_TEXTREL, 0))
return FALSE;
}
struct elf_x86_64_link_hash_table *htab;
struct bfd_link_hash_entry *base;
- if (!info->executable)
+ if (!bfd_link_executable (info))
return;
htab = elf_x86_64_hash_table (info);
bfd_vma *local_got_offsets;
bfd_vma *local_tlsdesc_gotents;
Elf_Internal_Rela *rel;
+ Elf_Internal_Rela *wrel;
Elf_Internal_Rela *relend;
const unsigned int plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
BFD_ASSERT (is_x86_64_elf (input_bfd));
+ /* Skip if check_relocs failed. */
+ if (input_section->check_relocs_failed)
+ return FALSE;
+
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
return FALSE;
elf_x86_64_set_tls_module_base (info);
- rel = relocs;
+ rel = wrel = relocs;
relend = relocs + input_section->reloc_count;
- for (; rel < relend; rel++)
+ for (; rel < relend; wrel++, rel++)
{
unsigned int r_type;
reloc_howto_type *howto;
int tls_type;
asection *base_got, *resolved_plt;
bfd_vma st_size;
+ bfd_boolean resolved_to_zero;
r_type = ELF32_R_TYPE (rel->r_info);
if (r_type == (int) R_X86_64_GNU_VTINHERIT
|| r_type == (int) R_X86_64_GNU_VTENTRY)
- continue;
+ {
+ if (wrel != rel)
+ *wrel = *rel;
+ continue;
+ }
if (r_type >= (int) R_X86_64_standard)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: unrecognized relocation (0x%x) in section `%A'"),
input_bfd, input_section, r_type);
bfd_set_error (bfd_error_bad_value);
st_size = sym->st_size;
/* Relocate against local STT_GNU_IFUNC symbol. */
- if (!info->relocatable
+ if (!bfd_link_relocatable (info)
&& ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
{
h = elf_x86_64_get_local_sym_hash (htab, input_bfd,
bfd_boolean warned ATTRIBUTE_UNUSED;
bfd_boolean ignored ATTRIBUTE_UNUSED;
- RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
- r_symndx, symtab_hdr, sym_hashes,
- h, sec, relocation,
- unresolved_reloc, warned, ignored);
- st_size = h->size;
- }
+ RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
+ r_symndx, symtab_hdr, sym_hashes,
+ h, sec, relocation,
+ unresolved_reloc, warned, ignored);
+ st_size = h->size;
+ }
+
+ if (sec != NULL && discarded_section (sec))
+ {
+ _bfd_clear_contents (howto, input_bfd, input_section,
+ contents + rel->r_offset);
+ wrel->r_offset = rel->r_offset;
+ wrel->r_info = 0;
+ wrel->r_addend = 0;
+
+ /* For ld -r, remove relocations in debug sections against
+ sections defined in discarded sections. Not done for
+ eh_frame editing code expects to be present. */
+ if (bfd_link_relocatable (info)
+ && (input_section->flags & SEC_DEBUGGING))
+ wrel--;
+
+ continue;
+ }
+
+ if (bfd_link_relocatable (info))
+ {
+ if (wrel != rel)
+ *wrel = *rel;
+ continue;
+ }
+
+ if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
+ {
+ if (r_type == R_X86_64_64)
+ {
+ /* For x32, treat R_X86_64_64 like R_X86_64_32 and
+ zero-extend it to 64bit if addend is zero. */
+ r_type = R_X86_64_32;
+ memset (contents + rel->r_offset + 4, 0, 4);
+ }
+ else if (r_type == R_X86_64_SIZE64)
+ {
+ /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
+ zero-extend it to 64bit if addend is zero. */
+ r_type = R_X86_64_SIZE32;
+ memset (contents + rel->r_offset + 4, 0, 4);
+ }
+ }
+
+ eh = (struct elf_x86_64_link_hash_entry *) h;
+
+ /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
+ it here if it is defined in a non-shared object. */
+ if (h != NULL
+ && h->type == STT_GNU_IFUNC
+ && h->def_regular)
+ {
+ bfd_vma plt_index;
+ const char *name;
+
+ if ((input_section->flags & SEC_ALLOC) == 0)
+ {
+ /* 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 ((input_section->flags & SEC_DEBUGGING) != 0)
+ continue;
+ abort ();
+ }
+
+ switch (r_type)
+ {
+ default:
+ break;
+
+ case R_X86_64_GOTPCREL:
+ case R_X86_64_GOTPCRELX:
+ case R_X86_64_REX_GOTPCRELX:
+ case R_X86_64_GOTPCREL64:
+ base_got = htab->elf.sgot;
+ off = h->got.offset;
+
+ if (base_got == NULL)
+ abort ();
+
+ if (off == (bfd_vma) -1)
+ {
+ /* We can't use h->got.offset here to save state, or
+ even just remember the offset, as finish_dynamic_symbol
+ would use that as offset into .got. */
+
+ if (h->plt.offset == (bfd_vma) -1)
+ abort ();
+
+ if (htab->elf.splt != NULL)
+ {
+ plt_index = h->plt.offset / plt_entry_size - 1;
+ off = (plt_index + 3) * GOT_ENTRY_SIZE;
+ base_got = htab->elf.sgotplt;
+ }
+ else
+ {
+ plt_index = h->plt.offset / plt_entry_size;
+ off = plt_index * GOT_ENTRY_SIZE;
+ base_got = htab->elf.igotplt;
+ }
+
+ if (h->dynindx == -1
+ || h->forced_local
+ || info->symbolic)
+ {
+ /* This references the local defitionion. 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.
- if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
+ 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,
+ base_got->contents + off);
+ /* Note that this is harmless for the GOTPLT64
+ case, as -1 | 1 still is -1. */
+ h->got.offset |= 1;
+ }
+ }
+ }
- if (info->relocatable)
- continue;
+ relocation = (base_got->output_section->vma
+ + base_got->output_offset + off);
- if (rel->r_addend == 0 && !ABI_64_P (output_bfd))
- {
- if (r_type == R_X86_64_64)
- {
- /* For x32, treat R_X86_64_64 like R_X86_64_32 and
- zero-extend it to 64bit if addend is zero. */
- r_type = R_X86_64_32;
- memset (contents + rel->r_offset + 4, 0, 4);
+ goto do_relocation;
}
- else if (r_type == R_X86_64_SIZE64)
+
+ if (h->plt.offset == (bfd_vma) -1)
{
- /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
- zero-extend it to 64bit if addend is zero. */
- r_type = R_X86_64_SIZE32;
- memset (contents + rel->r_offset + 4, 0, 4);
+ /* Handle static pointers of STT_GNU_IFUNC symbols. */
+ if (r_type == htab->pointer_r_type
+ && (input_section->flags & SEC_CODE) == 0)
+ goto do_ifunc_pointer;
+ goto bad_ifunc_reloc;
}
- }
-
- eh = (struct elf_x86_64_link_hash_entry *) h;
-
- /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
- it here if it is defined in a non-shared object. */
- if (h != NULL
- && h->type == STT_GNU_IFUNC
- && h->def_regular)
- {
- bfd_vma plt_index;
- const char *name;
-
- if ((input_section->flags & SEC_ALLOC) == 0
- || h->plt.offset == (bfd_vma) -1)
- abort ();
/* STT_GNU_IFUNC symbol must go through PLT. */
if (htab->elf.splt != NULL)
switch (r_type)
{
default:
+bad_ifunc_reloc:
if (h->root.root.string)
name = h->root.root.string;
else
name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation %s against STT_GNU_IFUNC "
- "symbol `%s' isn't handled by %s"), input_bfd,
- x86_64_elf_howto_table[r_type].name,
- name, __FUNCTION__);
+ "symbol `%s' isn't supported"), input_bfd,
+ howto->name, name);
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_X86_64_32S:
- if (info->shared)
+ if (bfd_link_pic (info))
abort ();
goto do_relocation;
goto do_relocation;
/* FALLTHROUGH */
case R_X86_64_64:
+do_ifunc_pointer:
if (rel->r_addend != 0)
{
if (h->root.root.string)
else
name = bfd_elf_sym_name (input_bfd, symtab_hdr,
sym, NULL);
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation %s against STT_GNU_IFUNC "
"symbol `%s' has non-zero addend: %d"),
- input_bfd, x86_64_elf_howto_table[r_type].name,
- name, rel->r_addend);
+ input_bfd, howto->name, name, rel->r_addend);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
/* Generate dynamic relcoation only when there is a
- non-GOT reference in a shared object. */
- if (info->shared && h->non_got_ref)
+ non-GOT reference in a shared object or there is no
+ PLT. */
+ if ((bfd_link_pic (info) && h->non_got_ref)
+ || h->plt.offset == (bfd_vma) -1)
{
Elf_Internal_Rela outrel;
asection *sreloc;
if (h->dynindx == -1
|| h->forced_local
- || info->executable)
+ || bfd_link_executable (info))
{
/* This symbol is resolved locally. */
outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
outrel.r_addend = 0;
}
- sreloc = htab->elf.irelifunc;
+ /* Dynamic relocations are stored in
+ 1. .rela.ifunc section in PIC object.
+ 2. .rela.got section in dynamic executable.
+ 3. .rela.iplt section in static executable. */
+ if (bfd_link_pic (info))
+ sreloc = htab->elf.irelifunc;
+ else if (htab->elf.splt != NULL)
+ sreloc = htab->elf.srelgot;
+ else
+ sreloc = htab->elf.irelplt;
elf_append_rela (output_bfd, sreloc, &outrel);
/* If this reloc is against an external symbol, we
case R_X86_64_PLT32:
case R_X86_64_PLT32_BND:
goto do_relocation;
-
- case R_X86_64_GOTPCREL:
- case R_X86_64_GOTPCREL64:
- base_got = htab->elf.sgot;
- off = h->got.offset;
-
- if (base_got == NULL)
- abort ();
-
- if (off == (bfd_vma) -1)
- {
- /* We can't use h->got.offset here to save state, or
- even just remember the offset, as finish_dynamic_symbol
- would use that as offset into .got. */
-
- if (htab->elf.splt != NULL)
- {
- plt_index = h->plt.offset / plt_entry_size - 1;
- off = (plt_index + 3) * GOT_ENTRY_SIZE;
- base_got = htab->elf.sgotplt;
- }
- else
- {
- plt_index = h->plt.offset / plt_entry_size;
- off = plt_index * GOT_ENTRY_SIZE;
- base_got = htab->elf.igotplt;
- }
-
- if (h->dynindx == -1
- || h->forced_local
- || info->symbolic)
- {
- /* This references the local defitionion. 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,
- base_got->contents + off);
- /* Note that this is harmless for the GOTPLT64
- case, as -1 | 1 still is -1. */
- h->got.offset |= 1;
- }
- }
- }
-
- relocation = (base_got->output_section->vma
- + base_got->output_offset + off);
-
- goto do_relocation;
}
}
+ resolved_to_zero = (eh != NULL
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh->has_got_reloc,
+ eh));
+
/* When generating a shared object, the relocations handled here are
copied into the output file to be resolved at run time. */
switch (r_type)
/* Relocation is to the entry for this symbol in the global
offset table. */
case R_X86_64_GOTPCREL:
+ case R_X86_64_GOTPCRELX:
+ case R_X86_64_REX_GOTPCRELX:
case R_X86_64_GOTPCREL64:
/* Use global offset table entry as symbol value. */
case R_X86_64_GOTPLT64:
dyn = htab->elf.dynamic_sections_created;
- if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
- || (info->shared
+ if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, bfd_link_pic (info), h)
+ || (bfd_link_pic (info)
&& SYMBOL_REFERENCES_LOCAL (info, h))
|| (ELF_ST_VISIBILITY (h->other)
&& h->root.type == bfd_link_hash_undefweak))
bfd_put_64 (output_bfd, relocation,
base_got->contents + off);
- if (info->shared)
+ if (bfd_link_pic (info))
{
asection *s;
Elf_Internal_Rela outrel;
relocation = base_got->output_section->vma
+ base_got->output_offset + off;
- if (r_type != R_X86_64_GOTPCREL && r_type != R_X86_64_GOTPCREL64)
+ if (r_type != R_X86_64_GOTPCREL
+ && r_type != R_X86_64_GOTPCRELX
+ && r_type != R_X86_64_REX_GOTPCRELX
+ && r_type != R_X86_64_GOTPCREL64)
relocation -= htab->elf.sgotplt->output_section->vma
- htab->elf.sgotplt->output_offset;
symbol for shared library since it may not be local when
used as function address or with copy relocation. We also
need to make sure that a symbol is referenced locally. */
- if (info->shared && h)
+ if (bfd_link_pic (info) && h)
{
if (!h->def_regular)
{
break;
}
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation R_X86_64_GOTOFF64 against undefined %s `%s' can not be used when making a shared object"),
input_bfd, v, h->root.root.string);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
- else if (!info->executable
+ else if (!bfd_link_executable (info)
&& !SYMBOL_REFERENCES_LOCAL (info, h)
&& (h->type == STT_FUNC
|| h->type == STT_OBJECT)
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: relocation R_X86_64_GOTOFF64 against protected %s `%s' can not be used when making a shared object"),
input_bfd,
h->type == STT_FUNC ? "function" : "data",
case R_X86_64_PC32:
case R_X86_64_PC32_BND:
/* Don't complain about -fPIC if the symbol is undefined when
- building executable. */
- if (info->shared
- && (input_section->flags & SEC_ALLOC) != 0
+ building executable unless it is unresolved weak symbol. */
+ if ((input_section->flags & SEC_ALLOC) != 0
&& (input_section->flags & SEC_READONLY) != 0
&& h != NULL
- && !(info->executable
- && h->root.type == bfd_link_hash_undefined))
+ && ((bfd_link_executable (info)
+ && h->root.type == bfd_link_hash_undefweak
+ && !resolved_to_zero)
+ || (bfd_link_pic (info)
+ && !(bfd_link_pie (info)
+ && h->root.type == bfd_link_hash_undefined))))
{
bfd_boolean fail = FALSE;
bfd_boolean branch
defined locally or for a branch. */
fail = !h->def_regular && !branch;
}
- else if (!(info->executable
+ else if (!(bfd_link_pie (info)
&& (h->needs_copy || eh->needs_copy)))
{
/* Symbol doesn't need copy reloc and isn't referenced
}
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;
- }
+ return elf_x86_64_need_pic (input_bfd, input_section,
+ h, NULL, NULL, howto);
}
/* Fall through. */
/* Don't copy a pc-relative relocation into the output file
if the symbol needs copy reloc or the symbol is undefined
- when building executable. */
- if ((info->shared
- && !(info->executable
+ when building executable. Copy dynamic function pointer
+ relocations. Don't generate dynamic relocations against
+ resolved undefined weak symbols in PIE. */
+ if ((bfd_link_pic (info)
+ && !(bfd_link_pie (info)
&& h != NULL
&& (h->needs_copy
|| eh->needs_copy
|| h->root.type == bfd_link_hash_undefined)
- && IS_X86_64_PCREL_TYPE (r_type))
+ && (IS_X86_64_PCREL_TYPE (r_type)
+ || r_type == R_X86_64_SIZE32
+ || r_type == R_X86_64_SIZE64))
&& (h == NULL
- || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
- || h->root.type != bfd_link_hash_undefweak)
+ || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ && !resolved_to_zero)
+ || h->root.type != bfd_link_hash_undefweak))
&& ((! IS_X86_64_PCREL_TYPE (r_type)
&& r_type != R_X86_64_SIZE32
&& r_type != R_X86_64_SIZE64)
|| ! SYMBOL_CALLS_LOCAL (info, h)))
|| (ELIMINATE_COPY_RELOCS
- && !info->shared
+ && !bfd_link_pic (info)
&& h != NULL
&& h->dynindx != -1
- && !h->non_got_ref
- && ((h->def_dynamic
- && !h->def_regular)
- || h->root.type == bfd_link_hash_undefweak
+ && (!h->non_got_ref
+ || eh->func_pointer_refcount > 0
+ || (h->root.type == bfd_link_hash_undefweak
+ && !resolved_to_zero))
+ && ((h->def_dynamic && !h->def_regular)
+ /* Undefined weak symbol is bound locally when
+ PIC is false. */
|| h->root.type == bfd_link_hash_undefined)))
{
Elf_Internal_Rela outrel;
else if (h != NULL
&& h->dynindx != -1
&& (IS_X86_64_PCREL_TYPE (r_type)
- || ! info->shared
- || ! SYMBOLIC_BIND (info, h)
+ || !(bfd_link_executable (info)
+ || SYMBOLIC_BIND (info, h))
|| ! h->def_regular))
{
outrel.r_info = htab->r_info (h->dynindx, r_type);
}
else
{
- /* This symbol is local, or marked to become local. */
- if (r_type == htab->pointer_r_type)
+ /* This symbol is local, or marked to become local.
+ When relocation overflow check is disabled, we
+ convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
+ if (r_type == htab->pointer_r_type
+ || (r_type == R_X86_64_32
+ && info->no_reloc_overflow_check))
{
relocate = TRUE;
outrel.r_info = htab->r_info (0, R_X86_64_RELATIVE);
name = bfd_elf_sym_name (input_bfd, symtab_hdr,
sym, NULL);
if (addend < 0)
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: addend -0x%x in relocation %s against "
"symbol `%s' at 0x%lx in section `%A' is "
"out of range"),
input_bfd, input_section, addend,
- x86_64_elf_howto_table[r_type].name,
- name, (unsigned long) rel->r_offset);
+ howto->name, name,
+ (unsigned long) rel->r_offset);
else
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B: addend 0x%x in relocation %s against "
"symbol `%s' at 0x%lx in section `%A' is "
"out of range"),
input_bfd, input_section, addend,
- x86_64_elf_howto_table[r_type].name,
- name, (unsigned long) rel->r_offset);
+ howto->name, name,
+ (unsigned long) rel->r_offset);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
input_section, contents,
symtab_hdr, sym_hashes,
&r_type, tls_type, rel,
- relend, h, r_symndx))
+ relend, h, r_symndx, TRUE))
return FALSE;
if (r_type == R_X86_64_TPOFF32)
if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
{
/* GD->LE transition. For 64bit, change
- .byte 0x66; leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
into:
- movq %fs:0, %rax
- leaq foo@tpoff(%rax), %rax
+ movq %fs:0, %rax
+ leaq foo@tpoff(%rax), %rax
For 32bit, change
- leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr
+ leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
into:
- movl %fs:0, %eax
- leaq foo@tpoff(%rax), %rax
+ movl %fs:0, %eax
+ leaq foo@tpoff(%rax), %rax
For largepic, change:
- leaq foo@tlsgd(%rip), %rdi
- movabsq $__tls_get_addr@pltoff, %rax
- addq %rbx, %rax
- call *%rax
+ leaq foo@tlsgd(%rip), %rdi
+ movabsq $__tls_get_addr@pltoff, %rax
+ addq %r15, %rax
+ call *%rax
into:
- movq %fs:0, %rax
- leaq foo@tpoff(%rax), %rax
- nopw 0x0(%rax,%rax,1) */
+ movq %fs:0, %rax
+ leaq foo@tpoff(%rax), %rax
+ nopw 0x0(%rax,%rax,1) */
int largepic = 0;
- if (ABI_64_P (output_bfd)
- && contents[roff + 5] == (bfd_byte) '\xb8')
+ if (ABI_64_P (output_bfd))
{
- memcpy (contents + roff - 3,
- "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
- "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
- largepic = 1;
+ if (contents[roff + 5] == 0xb8)
+ {
+ memcpy (contents + roff - 3,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
+ "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
+ largepic = 1;
+ }
+ else
+ memcpy (contents + roff - 4,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
+ 16);
}
- else if (ABI_64_P (output_bfd))
- memcpy (contents + roff - 4,
- "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
- 16);
else
memcpy (contents + roff - 3,
"\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
bfd_put_32 (output_bfd,
elf_x86_64_tpoff (info, relocation),
contents + roff + 8 + largepic);
- /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
+ /* Skip R_X86_64_PC32, R_X86_64_PLT32,
+ R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
rel++;
+ wrel++;
continue;
}
else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
if (ELF32_R_TYPE (rel->r_info) == R_X86_64_TLSGD)
{
/* GD->IE transition. For 64bit, change
- .byte 0x66; leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr@plt
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ .byte 0x66; leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64
+ call *__tls_get_addr@GOTPCREL(%rip
+ which may be converted to
+ addr32 call __tls_get_addr
into:
- movq %fs:0, %rax
- addq foo@gottpoff(%rip), %rax
+ movq %fs:0, %rax
+ addq foo@gottpoff(%rip), %rax
For 32bit, change
- leaq foo@tlsgd(%rip), %rdi
- .word 0x6666; rex64; call __tls_get_addr@plt
+ leaq foo@tlsgd(%rip), %rdi
+ .word 0x6666; rex64; call __tls_get_addr@PLT
+ or
+ leaq foo@tlsgd(%rip), %rdi
+ .byte 0x66; rex64;
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
into:
- movl %fs:0, %eax
- addq foo@gottpoff(%rip), %rax
+ movl %fs:0, %eax
+ addq foo@gottpoff(%rip), %rax
For largepic, change:
- leaq foo@tlsgd(%rip), %rdi
- movabsq $__tls_get_addr@pltoff, %rax
- addq %rbx, %rax
- call *%rax
+ leaq foo@tlsgd(%rip), %rdi
+ movabsq $__tls_get_addr@pltoff, %rax
+ addq %r15, %rax
+ call *%rax
into:
- movq %fs:0, %rax
- addq foo@gottpoff(%rax), %rax
- nopw 0x0(%rax,%rax,1) */
+ movq %fs:0, %rax
+ addq foo@gottpoff(%rax), %rax
+ nopw 0x0(%rax,%rax,1) */
int largepic = 0;
- if (ABI_64_P (output_bfd)
- && contents[roff + 5] == (bfd_byte) '\xb8')
+ if (ABI_64_P (output_bfd))
{
- memcpy (contents + roff - 3,
- "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
- "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
- largepic = 1;
+ if (contents[roff + 5] == 0xb8)
+ {
+ memcpy (contents + roff - 3,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
+ "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
+ largepic = 1;
+ }
+ else
+ memcpy (contents + roff - 4,
+ "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
+ 16);
}
- else if (ABI_64_P (output_bfd))
- memcpy (contents + roff - 4,
- "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
- 16);
else
memcpy (contents + roff - 3,
"\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
contents + roff + 8 + largepic);
/* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
rel++;
+ wrel++;
continue;
}
else if (ELF32_R_TYPE (rel->r_info) == R_X86_64_GOTPC32_TLSDESC)
if (! elf_x86_64_tls_transition (info, input_bfd,
input_section, contents,
symtab_hdr, sym_hashes,
- &r_type, GOT_UNKNOWN,
- rel, relend, h, r_symndx))
+ &r_type, GOT_UNKNOWN, rel,
+ relend, h, r_symndx, TRUE))
return FALSE;
if (r_type != R_X86_64_TLSLD)
{
/* LD->LE transition:
- leaq foo@tlsld(%rip), %rdi; call __tls_get_addr.
+ leaq foo@tlsld(%rip), %rdi
+ call __tls_get_addr@PLT
+ For 64bit, we change it into:
+ .word 0x6666; .byte 0x66; movq %fs:0, %rax
+ For 32bit, we change it into:
+ nopl 0x0(%rax); movl %fs:0, %eax
+ Or
+ leaq foo@tlsld(%rip), %rdi;
+ call *__tls_get_addr@GOTPCREL(%rip)
+ which may be converted to
+ addr32 call __tls_get_addr
For 64bit, we change it into:
- .word 0x6666; .byte 0x66; movq %fs:0, %rax.
+ .word 0x6666; .word 0x6666; movq %fs:0, %rax
For 32bit, we change it into:
- nopl 0x0(%rax); movl %fs:0, %eax.
+ nopw 0x0(%rax); movl %fs:0, %eax
For largepic, change:
- leaq foo@tlsgd(%rip), %rdi
- movabsq $__tls_get_addr@pltoff, %rax
- addq %rbx, %rax
- call *%rax
- into:
- data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
- movq %fs:0, %eax */
+ leaq foo@tlsgd(%rip), %rdi
+ movabsq $__tls_get_addr@pltoff, %rax
+ addq %rbx, %rax
+ call *%rax
+ into
+ data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
+ movq %fs:0, %eax */
BFD_ASSERT (r_type == R_X86_64_TPOFF32);
- if (ABI_64_P (output_bfd)
- && contents[rel->r_offset + 5] == (bfd_byte) '\xb8')
- memcpy (contents + rel->r_offset - 3,
- "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
- "\x64\x48\x8b\x04\x25\0\0\0", 22);
- else if (ABI_64_P (output_bfd))
- memcpy (contents + rel->r_offset - 3,
- "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
+ if (ABI_64_P (output_bfd))
+ {
+ if (contents[rel->r_offset + 5] == 0xb8)
+ memcpy (contents + rel->r_offset - 3,
+ "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
+ "\x64\x48\x8b\x04\x25\0\0\0", 22);
+ else if (contents[rel->r_offset + 4] == 0xff
+ || contents[rel->r_offset + 4] == 0x67)
+ memcpy (contents + rel->r_offset - 3,
+ "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
+ 13);
+ else
+ memcpy (contents + rel->r_offset - 3,
+ "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
+ }
else
- memcpy (contents + rel->r_offset - 3,
- "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
- /* Skip R_X86_64_PC32/R_X86_64_PLT32/R_X86_64_PLTOFF64. */
+ {
+ if (contents[rel->r_offset + 4] == 0xff)
+ memcpy (contents + rel->r_offset - 3,
+ "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
+ 13);
+ else
+ memcpy (contents + rel->r_offset - 3,
+ "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
+ }
+ /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
+ and R_X86_64_PLTOFF64. */
rel++;
+ wrel++;
continue;
}
break;
case R_X86_64_DTPOFF32:
- if (!info->executable|| (input_section->flags & SEC_CODE) == 0)
+ if (!bfd_link_executable (info)
+ || (input_section->flags & SEC_CODE) == 0)
relocation -= elf_x86_64_dtpoff_base (info);
else
relocation = elf_x86_64_tpoff (info, relocation);
case R_X86_64_TPOFF32:
case R_X86_64_TPOFF64:
- BFD_ASSERT (info->executable);
+ BFD_ASSERT (bfd_link_executable (info));
relocation = elf_x86_64_tpoff (info, relocation);
break;
&& _bfd_elf_section_offset (output_bfd, info, input_section,
rel->r_offset) != (bfd_vma) -1)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
input_bfd,
input_section,
}
if (r == bfd_reloc_overflow)
- {
- if (! ((*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section,
- rel->r_offset)))
- return FALSE;
- }
+ (*info->callbacks->reloc_overflow)
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
else
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("%B(%A+0x%lx): reloc against `%s': error %d"),
input_bfd, input_section,
(long) rel->r_offset, name, (int) r);
return FALSE;
}
}
+
+ if (wrel != rel)
+ *wrel = *rel;
+ }
+
+ if (wrel != rel)
+ {
+ Elf_Internal_Shdr *rel_hdr;
+ size_t deleted = rel - wrel;
+
+ rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
+ rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
+ if (rel_hdr->sh_size == 0)
+ {
+ /* It is too late to remove an empty reloc section. Leave
+ one NONE reloc.
+ ??? What is wrong with an empty section??? */
+ rel_hdr->sh_size = rel_hdr->sh_entsize;
+ deleted -= 1;
+ }
+ rel_hdr = _bfd_elf_single_rel_hdr (input_section);
+ rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
+ input_section->reloc_count -= deleted;
}
return TRUE;
elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
struct bfd_link_info *info,
struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym ATTRIBUTE_UNUSED)
+ Elf_Internal_Sym *sym)
{
struct elf_x86_64_link_hash_table *htab;
const struct elf_x86_64_backend_data *abed;
bfd_boolean use_plt_bnd;
struct elf_x86_64_link_hash_entry *eh;
+ bfd_boolean local_undefweak;
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
eh = (struct elf_x86_64_link_hash_entry *) h;
+ /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
+ resolved undefined weak symbols in executable so that their
+ references have value 0 at run-time. */
+ local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh->has_got_reloc,
+ eh);
+
if (h->plt.offset != (bfd_vma) -1)
{
bfd_vma plt_index;
/* This symbol has an entry in the procedure linkage table. Set
it up. */
if ((h->dynindx == -1
- && !((h->forced_local || info->executable)
+ && !local_undefweak
+ && !((h->forced_local || bfd_link_executable (info))
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
|| plt == NULL
resolved_plt->contents + plt_offset + plt_got_offset);
/* Fill in the entry in the global offset table, initially this
- points to the second part of the PLT entry. */
- bfd_put_64 (output_bfd, (plt->output_section->vma
- + plt->output_offset
- + h->plt.offset + abed->plt_lazy_offset),
- gotplt->contents + got_offset);
-
- /* Fill in the entry in the .rela.plt section. */
- rela.r_offset = (gotplt->output_section->vma
- + gotplt->output_offset
- + got_offset);
- if (h->dynindx == -1
- || ((info->executable
- || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
- && h->def_regular
- && h->type == STT_GNU_IFUNC))
- {
- /* If an STT_GNU_IFUNC symbol is locally defined, generate
- R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
- rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
- rela.r_addend = (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset);
- /* R_X86_64_IRELATIVE comes last. */
- plt_index = htab->next_irelative_index--;
- }
- else
+ points to the second part of the PLT entry. Leave the entry
+ as zero for undefined weak symbol in PIE. No PLT relocation
+ against undefined weak symbol in PIE. */
+ if (!local_undefweak)
{
- rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
- rela.r_addend = 0;
- plt_index = htab->next_jump_slot_index++;
- }
+ bfd_put_64 (output_bfd, (plt->output_section->vma
+ + plt->output_offset
+ + h->plt.offset
+ + abed->plt_lazy_offset),
+ gotplt->contents + got_offset);
+
+ /* Fill in the entry in the .rela.plt section. */
+ rela.r_offset = (gotplt->output_section->vma
+ + gotplt->output_offset
+ + got_offset);
+ if (h->dynindx == -1
+ || ((bfd_link_executable (info)
+ || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
+ && h->def_regular
+ && h->type == STT_GNU_IFUNC))
+ {
+ /* If an STT_GNU_IFUNC symbol is locally defined, generate
+ R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
+ rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
+ rela.r_addend = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ /* R_X86_64_IRELATIVE comes last. */
+ plt_index = htab->next_irelative_index--;
+ }
+ else
+ {
+ rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT);
+ rela.r_addend = 0;
+ plt_index = htab->next_jump_slot_index++;
+ }
- /* Don't fill PLT entry for static executables. */
- if (plt == htab->elf.splt)
- {
- bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
-
- /* Put relocation index. */
- bfd_put_32 (output_bfd, plt_index,
- plt->contents + h->plt.offset + abed->plt_reloc_offset);
-
- /* Put offset for jmp .PLT0 and check for overflow. We don't
- check relocation index for overflow since branch displacement
- will overflow first. */
- if (plt0_offset > 0x80000000)
- info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
- output_bfd, h->root.root.string);
- bfd_put_32 (output_bfd, - plt0_offset,
- plt->contents + h->plt.offset + plt_plt_offset);
- }
+ /* Don't fill PLT entry for static executables. */
+ if (plt == htab->elf.splt)
+ {
+ bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end;
+
+ /* Put relocation index. */
+ bfd_put_32 (output_bfd, plt_index,
+ (plt->contents + h->plt.offset
+ + abed->plt_reloc_offset));
+
+ /* Put offset for jmp .PLT0 and check for overflow. We don't
+ check relocation index for overflow since branch displacement
+ will overflow first. */
+ if (plt0_offset > 0x80000000)
+ info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"),
+ output_bfd, h->root.root.string);
+ bfd_put_32 (output_bfd, - plt0_offset,
+ plt->contents + h->plt.offset + plt_plt_offset);
+ }
- bed = get_elf_backend_data (output_bfd);
- loc = relplt->contents + plt_index * bed->s->sizeof_rela;
- bed->s->swap_reloca_out (output_bfd, &rela, loc);
+ bed = get_elf_backend_data (output_bfd);
+ loc = relplt->contents + plt_index * bed->s->sizeof_rela;
+ bed->s->swap_reloca_out (output_bfd, &rela, loc);
+ }
}
else if (eh->plt_got.offset != (bfd_vma) -1)
{
plt->contents + plt_offset + plt_got_offset);
}
- if (!h->def_regular
+ if (!local_undefweak
+ && !h->def_regular
&& (h->plt.offset != (bfd_vma) -1
|| eh->plt_got.offset != (bfd_vma) -1))
{
sym->st_value = 0;
}
+ /* Don't generate dynamic GOT relocation against undefined weak
+ symbol in executable. */
if (h->got.offset != (bfd_vma) -1
&& ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type)
- && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE)
+ && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE
+ && !local_undefweak)
{
Elf_Internal_Rela rela;
+ asection *relgot = htab->elf.srelgot;
/* This symbol has an entry in the global offset table. Set it
up. */
if (h->def_regular
&& h->type == STT_GNU_IFUNC)
{
- if (info->shared)
+ if (h->plt.offset == (bfd_vma) -1)
+ {
+ /* STT_GNU_IFUNC is referenced without PLT. */
+ if (htab->elf.splt == NULL)
+ {
+ /* use .rel[a].iplt section to store .got relocations
+ in static executable. */
+ relgot = htab->elf.irelplt;
+ }
+ if (SYMBOL_REFERENCES_LOCAL (info, h))
+ {
+ rela.r_info = htab->r_info (0,
+ R_X86_64_IRELATIVE);
+ rela.r_addend = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ }
+ else
+ goto do_glob_dat;
+ }
+ else if (bfd_link_pic (info))
{
/* Generate R_X86_64_GLOB_DAT. */
goto do_glob_dat;
return TRUE;
}
}
- else if (info->shared
+ else if (bfd_link_pic (info)
&& SYMBOL_REFERENCES_LOCAL (info, h))
{
if (!h->def_regular)
rela.r_addend = 0;
}
- elf_append_rela (output_bfd, htab->elf.srelgot, &rela);
+ elf_append_rela (output_bfd, relgot, &rela);
}
if (h->needs_copy)
info, h, NULL);
}
+/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
+ here since undefined weak symbol may not be dynamic and may not be
+ called for elf_x86_64_finish_dynamic_symbol. */
+
+static bfd_boolean
+elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
+ void *inf)
+{
+ struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
+ struct bfd_link_info *info = (struct bfd_link_info *) inf;
+
+ if (h->root.type != bfd_link_hash_undefweak
+ || h->dynindx != -1)
+ return TRUE;
+
+ return elf_x86_64_finish_dynamic_symbol (info->output_bfd,
+ info, h, NULL);
+}
+
/* 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
-elf_x86_64_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
+elf_x86_64_reloc_type_class (const struct bfd_link_info *info,
const asection *rel_sec ATTRIBUTE_UNUSED,
const Elf_Internal_Rela *rela)
{
+ bfd *abfd = info->output_bfd;
+ const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+ struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
+
+ if (htab->elf.dynsym != NULL
+ && htab->elf.dynsym->contents != NULL)
+ {
+ /* Check relocation against STT_GNU_IFUNC symbol if there are
+ dynamic symbols. */
+ unsigned long r_symndx = htab->r_sym (rela->r_info);
+ if (r_symndx != STN_UNDEF)
+ {
+ Elf_Internal_Sym sym;
+ if (!bed->s->swap_symbol_in (abfd,
+ (htab->elf.dynsym->contents
+ + r_symndx * bed->s->sizeof_sym),
+ 0, &sym))
+ abort ();
+
+ if (ELF_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
+ return reloc_class_ifunc;
+ }
+ }
+
switch ((int) ELF32_R_TYPE (rela->r_info))
{
+ case R_X86_64_IRELATIVE:
+ return reloc_class_ifunc;
case R_X86_64_RELATIVE:
case R_X86_64_RELATIVE64:
return reloc_class_relative;
{
if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
{
- (*_bfd_error_handler)
+ _bfd_error_handler
(_("discarded output section: `%A'"), htab->elf.sgotplt);
return FALSE;
}
elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
= GOT_ENTRY_SIZE;
+ /* Fill PLT entries for undefined weak symbols in PIE. */
+ if (bfd_link_pie (info))
+ bfd_hash_traverse (&info->hash->table,
+ elf_x86_64_pie_finish_undefweak_symbol,
+ info);
+
+ return TRUE;
+}
+
+/* Fill PLT/GOT entries and allocate dynamic relocations for local
+ STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
+ It has to be done before elf_link_sort_relocs is called so that
+ dynamic relocations are properly sorted. */
+
+static bfd_boolean
+elf_x86_64_output_arch_local_syms
+ (bfd *output_bfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info,
+ void *flaginfo ATTRIBUTE_UNUSED,
+ int (*func) (void *, const char *,
+ Elf_Internal_Sym *,
+ asection *,
+ struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
+{
+ struct elf_x86_64_link_hash_table *htab = elf_x86_64_hash_table (info);
+ if (htab == NULL)
+ return FALSE;
+
/* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
htab_traverse (htab->loc_hash_table,
elf_x86_64_finish_local_dynamic_symbol,
reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
+ bed->plt_reloc_offset));
- if (reloc_index >= count)
- abort ();
- if (plt_bnd)
+ if (reloc_index < count)
{
- /* This is the index in .plt section. */
- long plt_index = plt_offset / bed->plt_entry_size;
- /* Store VMA + the offset in .plt.bnd section. */
- plt_sym_val[reloc_index] =
- (plt_bnd->vma
- + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
+ if (plt_bnd)
+ {
+ /* This is the index in .plt section. */
+ long plt_index = plt_offset / bed->plt_entry_size;
+ /* Store VMA + the offset in .plt.bnd section. */
+ plt_sym_val[reloc_index] =
+ (plt_bnd->vma
+ + (plt_index - 1) * sizeof (elf_x86_64_legacy_plt2_entry));
+ }
+ else
+ plt_sym_val[reloc_index] = plt->vma + plt_offset;
}
- else
- plt_sym_val[reloc_index] = plt->vma + plt_offset;
plt_offset += bed->plt_entry_size;
/* PR binutils/18437: Skip extra relocations in the .rela.plt
static bfd_boolean
elf_x86_64_add_symbol_hook (bfd *abfd,
- struct bfd_link_info *info,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED,
Elf_Internal_Sym *sym,
const char **namep ATTRIBUTE_UNUSED,
flagword *flagsp ATTRIBUTE_UNUSED,
return TRUE;
}
- if ((ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE)
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
-
return TRUE;
}
#define elf_backend_rela_normal 1
#define elf_backend_plt_alignment 4
#define elf_backend_extern_protected_data 1
+#define elf_backend_caches_rawsize 1
#define elf_info_to_howto elf_x86_64_info_to_howto
#define elf_backend_create_dynamic_sections elf_x86_64_create_dynamic_sections
#define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
+#define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
#define elf_backend_gc_mark_hook elf_x86_64_gc_mark_hook
-#define elf_backend_gc_sweep_hook elf_x86_64_gc_sweep_hook
#define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
#define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
#ifdef CORE_HEADER
elf_x86_64_additional_program_headers
#define elf_backend_hash_symbol \
elf_x86_64_hash_symbol
+#define elf_backend_omit_section_dynsym \
+ ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
+#define elf_backend_fixup_symbol \
+ elf_x86_64_fixup_symbol
#include "elf64-target.h"
/* The 64-bit static TLS arena size is rounded to the nearest 16-byte
boundary. */
-#undef elf_backend_static_tls_alignment
+#undef elf_backend_static_tls_alignment
#define elf_backend_static_tls_alignment 16
/* The Solaris 2 ABI requires a plt symbol on all platforms.
Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
File, p.63. */
-#undef elf_backend_want_plt_sym
+#undef elf_backend_want_plt_sym
#define elf_backend_want_plt_sym 1
+#undef elf_backend_strtab_flags
+#define elf_backend_strtab_flags SHF_STRINGS
+
+static bfd_boolean
+elf64_x86_64_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
+ bfd *obfd ATTRIBUTE_UNUSED,
+ const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
+ Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
+{
+ /* PR 19938: FIXME: Need to add code for setting the sh_info
+ and sh_link fields of Solaris specific section types. */
+ return FALSE;
+}
+
+#undef elf_backend_copy_special_section_fields
+#define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
+
#include "elf64-target.h"
/* Native Client support. */
#undef elf_backend_static_tls_alignment
#undef elf_backend_want_plt_sym
#define elf_backend_want_plt_sym 0
+#undef elf_backend_strtab_flags
+#undef elf_backend_copy_special_section_fields
/* NaCl uses substantially different PLT entries for the same effects. */
0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw 0x0(%rax,%rax,1) */
/* 32 bytes of nop to pad out to the standard size. */
- 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
- 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
- 0x66, /* excess data32 prefix */
+ 0x66, /* excess data16 prefix */
0x90 /* nop */
};
0x41, 0xff, 0xe3, /* jmpq *%r11 */
/* 15-byte nop sequence to pad out to the next 32-byte boundary. */
- 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
/* Lazy GOT entries point here (32-byte aligned). */
0, 0, 0, 0, /* replaced with offset to start of .plt0. */
/* 22 bytes of nop to pad out to the standard size. */
- 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data32 prefixes */
+ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, /* excess data16 prefixes */
0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, /* nopw %cs:0x0(%rax,%rax,1) */
0x0f, 0x1f, 0x80, 0, 0, 0, 0, /* nopl 0x0(%rax) */
};
projects / deliverable / binutils-gdb.git / blobdiff