/* Intel 80386/80486-specific support for 32-bit ELF
- Copyright (C) 1993-2015 Free Software Foundation, Inc.
+ Copyright (C) 1993-2016 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
#include "objalloc.h"
#include "hashtab.h"
#include "dwarf2.h"
+#include "opcode/i386.h"
/* 386 uses REL relocations instead of RELA. */
#define USE_REL 1
HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_386_IRELATIVE",
TRUE, 0xffffffff, 0xffffffff, FALSE),
+ HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
+ bfd_elf_generic_reloc, "R_386_GOT32X",
+ TRUE, 0xffffffff, 0xffffffff, FALSE),
/* Another gap. */
-#define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
-#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
+#define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
+#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
/* GNU extension to record C++ vtable hierarchy. */
HOWTO (R_386_GNU_VTINHERIT, /* type */
TRACE ("BFD_RELOC_386_IRELATIVE");
return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
+ case BFD_RELOC_386_GOT32X:
+ TRACE ("BFD_RELOC_386_GOT32X");
+ return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
+
case BFD_RELOC_VTABLE_INHERIT:
TRACE ("BFD_RELOC_VTABLE_INHERIT");
return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
>= R_386_ext - R_386_standard)
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
- >= R_386_irelative - R_386_ext)
- && ((indx = r_type - R_386_vt_offset) - R_386_irelative
- >= R_386_vt - R_386_irelative))
+ >= R_386_ext2 - R_386_ext)
+ && ((indx = r_type - R_386_vt_offset) - R_386_ext2
+ >= R_386_vt - R_386_ext2))
{
(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
abfd, (int) r_type);
#define elf_backend_arch_data &elf_i386_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_i386_hash_table (INFO)->interp == NULL \
+ || !(GOT_RELOC) \
+ || (EH)->has_non_got_reloc \
+ || !(INFO)->dynamic_undefined_weak))
+
/* i386 ELF linker hash entry. */
struct elf_i386_link_hash_entry
(GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
unsigned char tls_type;
+ /* Symbol is referenced by R_386_GOTOFF relocation. */
+ unsigned int gotoff_ref : 1;
+
+ /* Symbol has GOT or PLT relocations. */
+ unsigned int has_got_reloc : 1;
+
+ /* Symbol has non-GOT/non-PLT relocations in text sections. */
+ unsigned int has_non_got_reloc : 1;
+
+ /* 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;
/* The index of the next unused R_386_IRELATIVE slot in .rel.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 i386 ELF linker hash table from a link_info structure. */
eh = (struct elf_i386_link_hash_entry *) entry;
eh->dyn_relocs = NULL;
eh->tls_type = GOT_UNKNOWN;
+ eh->gotoff_ref = 0;
+ eh->has_got_reloc = 0;
+ eh->has_non_got_reloc = 0;
+ eh->func_pointer_refcount = 0;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
}
ret->elf.indx = sec->id;
ret->elf.dynstr_index = ELF32_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;
- htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
- if (!info->shared)
- htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
+ /* 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 = sizeof ELF_DYNAMIC_INTERPRETER;
+ s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
+ htab->interp = s;
+ }
- if (!htab->sdynbss
- || (!info->shared && !htab->srelbss))
+ htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
+ if (!htab->sdynbss)
abort ();
+ if (bfd_link_executable (info))
+ {
+ /* Always allow copy relocs for building executables. */
+ asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
+ if (s == NULL)
+ {
+ const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
+ s = bfd_make_section_anyway_with_flags (dynobj,
+ ".rel.bss",
+ (bed->dynamic_sec_flags
+ | SEC_READONLY));
+ if (s == NULL
+ || ! bfd_set_section_alignment (dynobj, s,
+ bed->s->log_file_align))
+ return FALSE;
+ }
+ htab->srelbss = s;
+ }
+
if (get_elf_i386_backend_data (dynobj)->is_vxworks
&& !elf_vxworks_create_dynamic_sections (dynobj, info,
&htab->srelplt2))
eind->tls_type = GOT_UNKNOWN;
}
+ /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
+ generate a R_386_COPY reloc. */
+ edir->gotoff_ref |= eind->gotoff_ref;
+
+ edir->has_got_reloc |= eind->has_got_reloc;
+ edir->has_non_got_reloc |= eind->has_non_got_reloc;
+
if (ELIMINATE_COPY_RELOCS
&& ind->root.type != bfd_link_hash_indirect
&& dir->dynamic_adjusted)
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);
+ }
}
/* Return TRUE if the TLS access code sequence support transition
from R_TYPE. */
static bfd_boolean
-elf_i386_check_tls_transition (bfd *abfd, asection *sec,
+elf_i386_check_tls_transition (asection *sec,
bfd_byte *contents,
Elf_Internal_Shdr *symtab_hdr,
struct elf_link_hash_entry **sym_hashes,
struct elf_link_hash_entry *h;
bfd_vma offset;
- /* Get the section contents. */
- if (contents == NULL)
- {
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- else
- {
- /* FIXME: How to better handle error condition? */
- if (!bfd_malloc_and_get_section (abfd, sec, &contents))
- return FALSE;
-
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- }
-
offset = rel->r_offset;
switch (r_type)
{
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_386_TLS_IE_32:
case R_386_TLS_IE:
case R_386_TLS_GOTIE:
- if (info->executable)
+ if (bfd_link_executable (info))
{
if (h == NULL)
to_type = R_386_TLS_LE_32;
to_type = R_386_TLS_IE_32;
}
- /* When we are called from elf_i386_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_i386_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_386_TLS_LDM:
- if (info->executable)
+ if (bfd_link_executable (info))
to_type = R_386_TLS_LE_32;
break;
/* Check if the transition can be performed. */
if (check
- && ! elf_i386_check_tls_transition (abfd, sec, contents,
+ && ! elf_i386_check_tls_transition (sec, contents,
symtab_hdr, sym_hashes,
from_type, rel, relend))
{
return TRUE;
}
+/* With the local symbol, foo, we convert
+ mov foo@GOT[(%reg1)], %reg2
+ to
+ lea foo[@GOTOFF(%reg1)], %reg2
+ and convert
+ call/jmp *foo@GOT[(%reg)]
+ to
+ nop call foo/jmp foo nop
+ When PIC is false, convert
+ test %reg1, foo@GOT[(%reg2)]
+ to
+ test $foo, %reg1
+ and convert
+ binop foo@GOT[(%reg1)], %reg2
+ to
+ binop $foo, %reg2
+ where binop is one of adc, add, and, cmp, or, sbb, sub, xor
+ instructions. */
+
+static
+bfd_boolean
+elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
+ bfd_byte *contents,
+ Elf_Internal_Rela *irel,
+ struct elf_link_hash_entry *h,
+ bfd_boolean *converted,
+ struct bfd_link_info *link_info)
+{
+ struct elf_i386_link_hash_table *htab;
+ unsigned int opcode;
+ unsigned int modrm;
+ bfd_boolean baseless;
+ Elf_Internal_Sym *isym;
+ unsigned int addend;
+ unsigned int nop;
+ bfd_vma nop_offset;
+ bfd_boolean is_pic;
+ bfd_boolean to_reloc_32;
+ unsigned int r_type;
+ unsigned int r_symndx;
+ bfd_vma roff = irel->r_offset;
+
+ if (roff < 2)
+ return TRUE;
+
+ /* Addend for R_386_GOT32X relocations must be 0. */
+ addend = bfd_get_32 (abfd, contents + roff);
+ if (addend != 0)
+ return TRUE;
+
+ htab = elf_i386_hash_table (link_info);
+ is_pic = bfd_link_pic (link_info);
+
+ r_type = ELF32_R_TYPE (irel->r_info);
+ r_symndx = ELF32_R_SYM (irel->r_info);
+
+ modrm = bfd_get_8 (abfd, contents + roff - 1);
+ baseless = (modrm & 0xc7) == 0x5;
+
+ if (baseless && is_pic)
+ {
+ /* For PIC, disallow R_386_GOT32X without a base register
+ since we don't know what the GOT base is. */
+ const char *name;
+
+ if (h == NULL)
+ {
+ isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
+ r_symndx);
+ name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
+ }
+ else
+ name = h->root.root.string;
+
+ (*_bfd_error_handler)
+ (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
+ abfd, name);
+ return FALSE;
+ }
+
+ opcode = bfd_get_8 (abfd, contents + roff - 2);
+
+ /* Convert to R_386_32 if PIC is false or there is no base
+ register. */
+ to_reloc_32 = !is_pic || baseless;
+
+ /* Try to convert R_386_GOT32X. Get the symbol referred to by the
+ reloc. */
+ if (h == NULL)
+ {
+ if (opcode == 0x0ff)
+ /* Convert "call/jmp *foo@GOT[(%reg)]". */
+ goto convert_branch;
+ else
+ /* Convert "mov foo@GOT[(%reg1)], %reg2",
+ "test %reg1, foo@GOT(%reg2)" and
+ "binop foo@GOT[(%reg1)], %reg2". */
+ goto convert_load;
+ }
+
+ /* Undefined weak symbol is only bound locally in executable
+ and its reference is resolved as 0. */
+ if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
+ elf_i386_hash_entry (h)))
+ {
+ if (opcode == 0xff)
+ {
+ /* No direct branch to 0 for PIC. */
+ if (is_pic)
+ return TRUE;
+ else
+ goto convert_branch;
+ }
+ else
+ {
+ /* We can convert load of address 0 to R_386_32. */
+ to_reloc_32 = TRUE;
+ goto convert_load;
+ }
+ }
+
+ if (opcode == 0xff)
+ {
+ /* We have "call/jmp *foo@GOT[(%reg)]". */
+ if ((h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && SYMBOL_REFERENCES_LOCAL (link_info, h))
+ {
+ /* The function is locally defined. */
+convert_branch:
+ /* Convert R_386_GOT32X to R_386_PC32. */
+ if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
+ {
+ /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
+ is a nop prefix. */
+ modrm = 0xe8;
+ nop = link_info->call_nop_byte;
+ if (link_info->call_nop_as_suffix)
+ {
+ nop_offset = roff + 3;
+ irel->r_offset -= 1;
+ }
+ else
+ nop_offset = roff - 2;
+ }
+ else
+ {
+ /* Convert to "jmp foo nop". */
+ modrm = 0xe9;
+ nop = NOP_OPCODE;
+ nop_offset = roff + 3;
+ irel->r_offset -= 1;
+ }
+
+ bfd_put_8 (abfd, nop, contents + nop_offset);
+ bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
+ /* When converting to PC-relative relocation, we
+ need to adjust addend by -4. */
+ bfd_put_32 (abfd, -4, contents + irel->r_offset);
+ irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
+
+ *converted = TRUE;
+ }
+ }
+ else
+ {
+ /* We have "mov foo@GOT[(%re1g)], %reg2",
+ "test %reg1, foo@GOT(%reg2)" and
+ "binop foo@GOT[(%reg1)], %reg2".
+
+ Avoid optimizing _DYNAMIC since ld.so may use its
+ link-time address. */
+ if (h == htab->elf.hdynamic)
+ return TRUE;
+
+ /* def_regular 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_defined
+ || h->root.type == bfd_link_hash_defweak)
+ && SYMBOL_REFERENCES_LOCAL (link_info, h))
+ {
+convert_load:
+ if (opcode == 0x8b)
+ {
+ if (to_reloc_32)
+ {
+ /* Convert "mov foo@GOT[(%reg1)], %reg2" to
+ "mov $foo, %reg2" with R_386_32. */
+ r_type = R_386_32;
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ bfd_put_8 (abfd, modrm, contents + roff - 1);
+ opcode = 0xc7;
+ }
+ else
+ {
+ /* Convert "mov foo@GOT(%reg1), %reg2" to
+ "lea foo@GOTOFF(%reg1), %reg2". */
+ r_type = R_386_GOTOFF;
+ opcode = 0x8d;
+ }
+ }
+ else
+ {
+ /* Only R_386_32 is supported. */
+ if (!to_reloc_32)
+ return TRUE;
+
+ if (opcode == 0x85)
+ {
+ /* Convert "test %reg1, foo@GOT(%reg2)" to
+ "test $foo, %reg1". */
+ modrm = 0xc0 | (modrm & 0x38) >> 3;
+ opcode = 0xf7;
+ }
+ else
+ {
+ /* Convert "binop foo@GOT(%reg1), %reg2" to
+ "binop $foo, %reg2". */
+ modrm = (0xc0
+ | (modrm & 0x38) >> 3
+ | (opcode & 0x3c));
+ opcode = 0x81;
+ }
+ bfd_put_8 (abfd, modrm, contents + roff - 1);
+ r_type = R_386_32;
+ }
+
+ bfd_put_8 (abfd, opcode, contents + roff - 2);
+ irel->r_info = ELF32_R_INFO (r_symndx, r_type);
+
+ *converted = TRUE;
+ }
+ }
+
+ return TRUE;
+}
+
/* 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
/* Look through the relocs for a section during the first phase, and
calculate needed space in the global offset table, procedure linkage
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;
BFD_ASSERT (is_i386_elf (abfd));
htab = elf_i386_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_i386_backend_data (abfd)->is_vxworks
&& (get_elf_i386_backend_data (abfd)
unsigned int r_type;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
+ struct elf_i386_link_hash_entry *eh;
Elf_Internal_Sym *isym;
const char *name;
bfd_boolean size_reloc;
(*_bfd_error_handler) (_("%B: bad symbol index: %d"),
abfd,
r_symndx);
- return FALSE;
+ 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 (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
{
h = elf_i386_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;
h = (struct elf_link_hash_entry *) h->root.u.i.link;
}
+ eh = (struct elf_i386_link_hash_entry *) h;
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:
break;
+ case R_386_GOTOFF:
+ eh->gotoff_ref = 1;
case R_386_32:
case R_386_PC32:
case R_386_PLT32:
case R_386_GOT32:
- case R_386_GOTOFF:
+ case R_386_GOT32X:
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_i386_tls_transition (info, abfd, sec, NULL,
+ if (! elf_i386_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;
switch (r_type)
{
if (h == NULL)
continue;
+ eh->has_got_reloc = 1;
h->needs_plt = 1;
h->plt.refcount += 1;
break;
case R_386_TLS_IE_32:
case R_386_TLS_IE:
case R_386_TLS_GOTIE:
- if (!info->executable)
+ if (!bfd_link_executable (info))
info->flags |= DF_STATIC_TLS;
/* Fall through */
case R_386_GOT32:
+ case R_386_GOT32X:
case R_386_TLS_GD:
case R_386_TLS_GOTDESC:
case R_386_TLS_DESC_CALL:
switch (r_type)
{
default:
- case R_386_GOT32: tls_type = GOT_NORMAL; break;
+ case R_386_GOT32:
+ case R_386_GOT32X:
+ tls_type = GOT_NORMAL;
+ break;
case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
case R_386_TLS_GOTDESC:
case R_386_TLS_DESC_CALL:
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_i386_local_tlsdesc_gotent (abfd)
= (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
"thread local symbol"),
abfd, name);
bfd_set_error (bfd_error_bad_value);
- return FALSE;
+ goto error_return;
}
}
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
- return FALSE;
+ goto error_return;
}
if (r_type != R_386_TLS_IE)
- break;
+ {
+ if (eh != NULL)
+ eh->has_got_reloc = 1;
+ break;
+ }
/* Fall through */
case R_386_TLS_LE_32:
case R_386_TLS_LE:
- if (info->executable)
+ if (eh != NULL)
+ eh->has_got_reloc = 1;
+ if (bfd_link_executable (info))
break;
info->flags |= DF_STATIC_TLS;
- /* Fall through */
+ goto do_relocation;
case R_386_32:
case R_386_PC32:
- if (h != NULL && info->executable)
+ if (eh != NULL && (sec->flags & SEC_CODE) != 0)
+ eh->has_non_got_reloc = 1;
+do_relocation:
+ /* STT_GNU_IFUNC symbol must go through PLT even if it is
+ locally defined and undefined symbol may turn out to be
+ a STT_GNU_IFUNC symbol later. */
+ if (h != NULL
+ && (bfd_link_executable (info)
+ || ((h->type == STT_GNU_IFUNC
+ || h->root.type == bfd_link_hash_undefweak
+ || h->root.type == bfd_link_hash_undefined)
+ && SYMBOLIC_BIND (info, h))))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this
/* 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_386_PC32)
- h->pointer_equality_needed = 1;
+ if (r_type == R_386_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
+ {
+ h->pointer_equality_needed = 1;
+ /* R_386_32 can be resolved at run-time. */
+ if (r_type == R_386_32
+ && (sec->flags & SEC_READONLY) == 0)
+ eh->func_pointer_refcount += 1;
+ }
}
size_reloc = FALSE;
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
+ if ((bfd_link_pic (info)
&& (sec->flags & SEC_ALLOC) != 0
&& (r_type != R_386_PC32
|| (h != NULL
- && (! SYMBOLIC_BIND (info, h)
+ && (! (bfd_link_pie (info)
+ || SYMBOLIC_BIND (info, h))
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
|| (ELIMINATE_COPY_RELOCS
- && !info->shared
+ && !bfd_link_pic (info)
&& (sec->flags & SEC_ALLOC) != 0
&& h != NULL
&& (h->root.type == bfd_link_hash_defweak
(sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
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_i386_link_hash_entry *) h)->dyn_relocs;
+ head = &eh->dyn_relocs;
}
else
{
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_386_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_offset))
- return FALSE;
+ goto error_return;
break;
default:
if (use_plt_got
&& h != NULL
&& h->plt.refcount > 0
- && 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_386_GOT32
+ if (r_type == R_386_GOT32X
&& (h == NULL || h->type != STT_GNU_IFUNC))
- sec->need_convert_mov_to_lea = 1;
+ sec->need_convert_load = 1;
+ }
+
+ 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
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_i386_gc_sweep_hook (bfd *abfd,
- struct bfd_link_info *info,
- asection *sec,
- const Elf_Internal_Rela *relocs)
+elf_i386_fixup_symbol (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h)
{
- struct elf_i386_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_i386_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);
-
- relend = relocs + sec->reloc_count;
- for (rel = relocs; rel < relend; rel++)
+ if (h->dynindx != -1
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ elf_i386_hash_entry (h)->has_got_reloc,
+ elf_i386_hash_entry (h)))
{
- unsigned long r_symndx;
- unsigned int r_type;
- struct elf_link_hash_entry *h = NULL;
-
- r_symndx = ELF32_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
- && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
- {
- h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
- if (h == NULL)
- abort ();
- }
- }
-
- if (h)
- {
- struct elf_i386_link_hash_entry *eh;
- struct elf_dyn_relocs **pp;
- struct elf_dyn_relocs *p;
-
- eh = (struct elf_i386_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_i386_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_386_TLS_LDM:
- if (htab->tls_ldm_got.refcount > 0)
- htab->tls_ldm_got.refcount -= 1;
- break;
-
- case R_386_TLS_GD:
- case R_386_TLS_GOTDESC:
- case R_386_TLS_DESC_CALL:
- case R_386_TLS_IE_32:
- case R_386_TLS_IE:
- case R_386_TLS_GOTIE:
- case R_386_GOT32:
- 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_386_32:
- case R_386_PC32:
- case R_386_SIZE32:
- if (info->shared
- && (h == NULL || h->type != STT_GNU_IFUNC))
- break;
- /* Fall through */
-
- case R_386_PLT32:
- if (h != NULL)
- {
- if (h->plt.refcount > 0)
- h->plt.refcount -= 1;
- }
- break;
-
- case R_386_GOTOFF:
- if (h != NULL && h->type == STT_GNU_IFUNC)
- {
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- 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;
}
only references to the symbol are via the global offset table.
For such cases we need not do anything here; the relocations will
be handled correctly by relocate_section. */
- if (info->shared)
+ if (!bfd_link_executable (info))
return TRUE;
/* If there are no references to this symbol that do not use the
- GOT, we don't need to generate a copy reloc. */
- if (!h->non_got_ref)
+ GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
+ reloc. */
+ eh = (struct elf_i386_link_hash_entry *) h;
+ if (!h->non_got_ref && !eh->gotoff_ref)
return TRUE;
/* If -z nocopyreloc was given, we won't generate them either. */
if (htab == NULL)
return FALSE;
- /* If there aren't any dynamic relocs in read-only sections, then
- we can keep the dynamic relocs and avoid the copy reloc. This
- doesn't work on VxWorks, where we can not have dynamic relocations
- (other than copy and jump slot relocations) in an executable. */
+ /* If there aren't any dynamic relocs in read-only sections nor
+ R_386_GOTOFF relocation, then we can keep the dynamic relocs and
+ avoid the copy reloc. This doesn't work on VxWorks, where we can
+ not have dynamic relocations (other than copy and jump slot
+ relocations) in an executable. */
if (ELIMINATE_COPY_RELOCS
+ && !eh->gotoff_ref
&& !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
{
- eh = (struct elf_i386_link_hash_entry *) h;
for (p = eh->dyn_relocs; p != NULL; p = p->next)
{
s = p->sec->output_section;
struct elf_i386_link_hash_entry *eh;
struct elf_dyn_relocs *p;
unsigned plt_entry_size;
+ bfd_boolean resolved_to_zero;
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
+ resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh->has_got_reloc,
+ eh);
+
+ /* 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;
+
/* 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
if (h->type == STT_GNU_IFUNC
&& h->def_regular)
return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
- plt_entry_size,
+ &htab->readonly_dynrelocs_against_ifunc,
+ plt_entry_size,
plt_entry_size, 4);
+ /* 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 = eh->plt_got.refcount > 0;
+ bfd_boolean use_plt_got;
+
+ /* 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;
+
+ /* Use the GOT PLT. */
+ h->got.refcount = 1;
+ eh->plt_got.refcount = 1;
+ }
+
+ use_plt_got = eh->plt_got.refcount > 0;
/* Make sure this symbol is output as a dynamic symbol.
Undefined weak syms won't yet be marked as dynamic. */
if (h->dynindx == -1
- && !h->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 *got_s = htab->plt_got;
/* If this is the first .plt entry, make room for the special
- first entry. */
+ first entry. The .plt section is used by prelink to undo
+ prelinking for dynamic relocations. */
if (s->size == 0)
s->size = plt_entry_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 += 4;
- /* We also need to make an entry in the .rel.plt section. */
- htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
- 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 .rel.plt
+ section. */
+ htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
+ htab->elf.srelplt->reloc_count++;
+ }
}
if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
- && !info->shared)
+ && !bfd_link_pic (info))
{
/* VxWorks has a second set of relocations for each PLT entry
in executables. They go in a separate relocation section,
}
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_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
make it a R_386_TLS_LE_32 requiring no TLS entry. */
if (h->got.refcount > 0
- && info->executable
+ && bfd_link_executable (info)
&& h->dynindx == -1
&& (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
h->got.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;
R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
(but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
need two), R_386_TLS_GD needs one if local symbol and two if
- global. */
+ global. No dynamic relocation against resolved undefined weak
+ symbol in executable. */
if (tls_type == GOT_TLS_IE_BOTH)
htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
else if (GOT_TLS_GD_P (tls_type))
htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
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 += sizeof (Elf32_External_Rel);
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))
{
/* The only reloc that uses pc_count is R_386_PC32, which will
appear on a call or on something like ".long foo - .". We
}
/* Also discard relocs on undefined weak syms with non-default
- visibility. */
+ visibility or in PIE. */
if (eh->dyn_relocs != NULL
&& h->root.type == bfd_link_hash_undefweak)
{
- if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
- eh->dyn_relocs = NULL;
+ /* Undefined weak symbol is never bound locally in shared
+ library. */
+ if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+ || resolved_to_zero)
+ {
+ if (h->non_got_ref)
+ {
+ /* Keep dynamic non-GOT/non-PLT relocation so that we
+ can branch to 0 without PLT. */
+ struct elf_dyn_relocs **pp;
- /* Make sure undefined weak symbols are output as a dynamic
- symbol in PIEs. */
+ for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
+ if (p->pc_count == 0)
+ *pp = p->next;
+ else
+ {
+ /* Remove non-R_386_PC32 relocation. */
+ p->count = p->pc_count;
+ pp = &p->next;
+ }
+
+ if (eh->dyn_relocs != NULL)
+ {
+ /* Make sure undefined weak symbols are output
+ as dynamic symbols in PIEs for dynamic non-GOT
+ non-PLT reloations. */
+ if (! bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+ }
+ else
+ eh->dyn_relocs = NULL;
+ }
else if (h->dynindx == -1
&& !h->forced_local)
{
{
/* 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
/* 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;
}
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@GOT(%reg), %reg
- to
- lea foo@GOTOFF(%reg), %reg
- with the local symbol, foo. */
+/* Convert load via the GOT slot to load immediate. */
static bfd_boolean
-elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
- struct bfd_link_info *link_info)
+elf_i386_convert_load (bfd *abfd, asection *sec,
+ struct bfd_link_info *link_info)
{
+ struct elf_i386_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *contents;
- struct elf_i386_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_i386_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 = ELF32_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_386_GOT32)
+ /* Don't convert R_386_GOT32 since we can't tell if it is applied
+ to "mov $foo@GOT, %reg" which isn't a load via GOT. */
+ if (r_type != R_386_GOT32X)
continue;
- /* Get the symbol referred to by the reloc. */
+ r_symndx = ELF32_R_SYM (irel->r_info);
if (r_symndx < symtab_hdr->sh_info)
+ h = elf_i386_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 GOT32 relocations. */
+ if (h != NULL && h->type == STT_GNU_IFUNC)
+ continue;
+
+ converted = FALSE;
+ if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
+ irel, h, &converted, link_info))
+ goto error_return;
- /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
- if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
- && irel->r_offset >= 2
- && bfd_get_8 (input_bfd,
- 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 (output_bfd, 0x8d,
- contents + irel->r_offset - 2);
- irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
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_386_GOT32 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 (input_bfd,
- contents + irel->r_offset - 2) == 0x8b)
- {
- bfd_put_8 (output_bfd, 0x8d,
- contents + irel->r_offset - 2);
- irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
- 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 = sizeof ELF_DYNAMIC_INTERPRETER;
- s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
- }
- }
-
/* Set up .got offsets for local syms, and space for local dynamic
relocs. */
for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
{
struct elf_dyn_relocs *p;
- if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
+ if (!elf_i386_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);
|| *local_tls_type == GOT_TLS_IE_BOTH)
s->size += 4;
}
- 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_REL)
- || !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_REL)
+ || !add_dynamic_entry (DT_JMPREL, 0))
+ return FALSE;
+ }
}
if (relocs)
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_i386_link_hash_table *htab;
struct bfd_link_hash_entry *base;
- if (!info->executable)
+ if (!bfd_link_executable (info))
return;
htab = elf_i386_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;
bfd_boolean is_vxworks_tls;
unsigned plt_entry_size;
BFD_ASSERT (is_i386_elf (input_bfd));
+ /* Skip if check_relocs failed. */
+ if (input_section->check_relocs_failed)
+ return FALSE;
+
htab = elf_i386_hash_table (info);
if (htab == NULL)
return FALSE;
/* We have to handle relocations in vxworks .tls_vars sections
specially, because the dynamic loader is 'weird'. */
is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
- && info->shared
+ && bfd_link_pic (info)
&& !strcmp (input_section->output_section->name,
".tls_vars"));
plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
- 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;
bfd_vma st_size;
asection *resolved_plt;
+ bfd_boolean resolved_to_zero;
r_type = ELF32_R_TYPE (rel->r_info);
if (r_type == R_386_GNU_VTINHERIT
|| r_type == R_386_GNU_VTENTRY)
- continue;
+ {
+ if (wrel != rel)
+ *wrel = *rel;
+ continue;
+ }
if ((indx = r_type) >= R_386_standard
&& ((indx = r_type - R_386_ext_offset) - R_386_standard
>= R_386_ext - R_386_standard)
&& ((indx = r_type - R_386_tls_offset) - R_386_ext
- >= R_386_irelative - R_386_ext))
+ >= R_386_ext2 - R_386_ext))
{
(*_bfd_error_handler)
(_("%B: unrecognized relocation (0x%x) in section `%A'"),
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
&& ((sec->flags & SEC_MERGE) != 0
- || (info->relocatable
+ || (bfd_link_relocatable (info)
&& sec->output_offset != 0)))
{
bfd_vma addend;
abort ();
}
- if (info->relocatable)
+ if (bfd_link_relocatable (info))
addend += sec->output_offset;
else
{
break;
}
}
- else if (!info->relocatable
+ else if (!bfd_link_relocatable (info)
&& ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
{
/* Relocate against local STT_GNU_IFUNC symbol. */
}
if (sec != NULL && discarded_section (sec))
- RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
- rel, 1, relend, howto, 0, contents);
+ {
+ _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 (info->relocatable)
- continue;
+ if (bfd_link_relocatable (info))
+ {
+ if (wrel != rel)
+ *wrel = *rel;
+ continue;
+ }
/* Since STT_GNU_IFUNC symbol must go through PLT, we handle
it here if it is defined in a non-shared object. */
bfd_vma plt_index;
const char *name;
- if ((input_section->flags & SEC_ALLOC) == 0
- || h->plt.offset == (bfd_vma) -1)
+ 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 ();
+ }
+ else if (h->plt.offset == (bfd_vma) -1)
abort ();
/* STT_GNU_IFUNC symbol must go through PLT. */
case R_386_32:
/* Generate dynamic relcoation only when there is a
non-GOT reference in a shared object. */
- if (info->shared && h->non_got_ref)
+ if (bfd_link_pic (info) && h->non_got_ref)
{
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 = ELF32_R_INFO (0, R_386_IRELATIVE);
goto do_relocation;
case R_386_GOT32:
+ case R_386_GOT32X:
base_got = htab->elf.sgot;
off = h->got.offset;
}
}
+ eh = (struct elf_i386_link_hash_entry *) h;
+ resolved_to_zero = (eh != NULL
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh->has_got_reloc,
+ eh));
+
switch (r_type)
{
+ case R_386_GOT32X:
+ /* Avoid optimizing _DYNAMIC since ld.so may use its
+ link-time address. */
+ if (h == htab->elf.hdynamic)
+ goto r_386_got32;
+
+ if (bfd_link_pic (info))
+ {
+ /* It is OK to convert mov to lea and convert indirect
+ branch to direct branch. It is OK to convert adc,
+ add, and, cmp, or, sbb, sub, test, xor only when PIC
+ is false. */
+ unsigned int opcode, addend;
+ addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
+ if (addend != 0)
+ goto r_386_got32;
+ opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
+ if (opcode != 0x8b && opcode != 0xff)
+ goto r_386_got32;
+ }
+
+ /* Resolve "mov GOT[(%reg)], %reg",
+ "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
+ and "binop foo@GOT[(%reg)], %reg". */
+ if (h == NULL
+ || (h->plt.offset == (bfd_vma) -1
+ && h->got.offset == (bfd_vma) -1)
+ || htab->elf.sgotplt == NULL)
+ abort ();
+
+ offplt = (htab->elf.sgotplt->output_section->vma
+ + htab->elf.sgotplt->output_offset);
+
+ /* It is relative to .got.plt section. */
+ if (h->got.offset != (bfd_vma) -1)
+ /* Use GOT entry. Mask off the least significant bit in
+ GOT offset which may be set by R_386_GOT32 processing
+ below. */
+ relocation = (htab->elf.sgot->output_section->vma
+ + htab->elf.sgot->output_offset
+ + (h->got.offset & ~1) - offplt);
+ else
+ /* Use GOTPLT entry. */
+ relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
+
+ if (!bfd_link_pic (info))
+ {
+ /* If not PIC, add the .got.plt section address for
+ baseless addressing. */
+ unsigned int modrm;
+ modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
+ if ((modrm & 0xc7) == 0x5)
+ relocation += offplt;
+ }
+
+ unresolved_reloc = FALSE;
+ break;
+
case R_386_GOT32:
+r_386_got32:
/* Relocation is to the entry for this symbol in the global
offset table. */
if (htab->elf.sgot == NULL)
off = h->got.offset;
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_32 (output_bfd, relocation,
htab->elf.sgot->contents + off);
- if (info->shared)
+ if (bfd_link_pic (info))
{
asection *s;
Elf_Internal_Rela outrel;
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_executable (info) && h)
{
if (!h->def_regular)
{
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
- else if (!info->executable
- && !SYMBOL_REFERENCES_LOCAL (info, h)
+ else if (!SYMBOL_REFERENCES_LOCAL (info, h)
&& (h->type == STT_FUNC
|| h->type == STT_OBJECT)
&& ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
if (h == NULL)
break;
- eh = (struct elf_i386_link_hash_entry *) h;
if ((h->plt.offset == (bfd_vma) -1
&& eh->plt_got.offset == (bfd_vma) -1)
|| htab->elf.splt == NULL)
|| is_vxworks_tls)
break;
- if ((info->shared
+ /* Copy dynamic function pointer relocations. Don't generate
+ dynamic relocations against resolved undefined weak symbols
+ in PIE, except for R_386_PC32. */
+ if ((bfd_link_pic (info)
&& (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
+ || r_type == R_386_PC32))
+ || h->root.type != bfd_link_hash_undefweak))
&& ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
|| !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->root.type == bfd_link_hash_undefined)))
+ && (!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_undefweak)))
{
Elf_Internal_Rela outrel;
bfd_boolean skip, relocate;
else if (h != NULL
&& h->dynindx != -1
&& (r_type == R_386_PC32
- || !info->shared
- || !SYMBOLIC_BIND (info, h)
+ || !(bfd_link_executable (info)
+ || SYMBOLIC_BIND (info, h))
|| !h->def_regular))
outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
else
break;
case R_386_TLS_IE:
- if (!info->executable)
+ if (!bfd_link_executable (info))
{
Elf_Internal_Rela outrel;
asection *sreloc;
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_386_TLS_LE_32)
contents + roff);
/* Skip R_386_PC32/R_386_PLT32. */
rel++;
+ wrel++;
continue;
}
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
contents + roff + 8);
/* Skip R_386_PLT32. */
rel++;
+ wrel++;
continue;
}
else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
input_section, contents,
symtab_hdr, sym_hashes,
&r_type, GOT_UNKNOWN, rel,
- relend, h, r_symndx))
+ relend, h, r_symndx, TRUE))
return FALSE;
if (r_type != R_386_TLS_LDM)
"\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
/* Skip R_386_PC32/R_386_PLT32. */
rel++;
+ wrel++;
continue;
}
break;
case R_386_TLS_LDO_32:
- if (!info->executable || (input_section->flags & SEC_CODE) == 0)
+ if (!bfd_link_executable (info)
+ || (input_section->flags & SEC_CODE) == 0)
relocation -= elf_i386_dtpoff_base (info);
else
/* When converting LDO to LE, we must negate. */
case R_386_TLS_LE_32:
case R_386_TLS_LE:
- if (!info->executable)
+ if (!bfd_link_executable (info))
{
Elf_Internal_Rela outrel;
asection *sreloc;
}
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)
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;
unsigned plt_entry_size;
const struct elf_i386_backend_data *abed;
struct elf_i386_link_hash_entry *eh;
+ bfd_boolean local_undefweak;
htab = elf_i386_hash_table (info);
if (htab == NULL)
eh = (struct elf_i386_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;
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
}
/* Fill in the entry in the procedure linkage table. */
- if (! info->shared)
+ if (! bfd_link_pic (info))
{
memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
abed->plt->plt_entry_size);
s = ((h->plt.offset - abed->plt->plt_entry_size)
/ abed->plt->plt_entry_size);
/* K: Number of relocations for PLTResolve. */
- if (info->shared)
+ if (bfd_link_pic (info))
k = PLTRESOLVE_RELOCS_SHLIB;
else
k = PLTRESOLVE_RELOCS;
+ abed->plt->plt_got_offset);
}
- /* Fill in the entry in the global offset table. */
- bfd_put_32 (output_bfd,
- (plt->output_section->vma
- + plt->output_offset
- + h->plt.offset
- + abed->plt->plt_lazy_offset),
- gotplt->contents + got_offset);
-
- /* Fill in the entry in the .rel.plt section. */
- rel.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))
+ /* Fill in the entry in the global offset table. Leave the entry
+ as zero for undefined weak symbol in PIE. No PLT relocation
+ against undefined weak symbol in PIE. */
+ if (!local_undefweak)
{
- /* If an STT_GNU_IFUNC symbol is locally defined, generate
- R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
- in the .got.plt section. */
bfd_put_32 (output_bfd,
- (h->root.u.def.value
- + h->root.u.def.section->output_section->vma
- + h->root.u.def.section->output_offset),
+ (plt->output_section->vma
+ + plt->output_offset
+ + h->plt.offset
+ + abed->plt->plt_lazy_offset),
gotplt->contents + got_offset);
- rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
- /* R_386_IRELATIVE comes last. */
- plt_index = htab->next_irelative_index--;
- }
- else
- {
- rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
- plt_index = htab->next_jump_slot_index++;
- }
- loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
- bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
- /* Don't fill PLT entry for static executables. */
- if (plt == htab->elf.splt)
- {
- bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
- plt->contents + h->plt.offset
- + abed->plt->plt_reloc_offset);
- bfd_put_32 (output_bfd, - (h->plt.offset
- + abed->plt->plt_plt_offset + 4),
- plt->contents + h->plt.offset
- + abed->plt->plt_plt_offset);
+ /* Fill in the entry in the .rel.plt section. */
+ rel.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_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
+ in the .got.plt section. */
+ bfd_put_32 (output_bfd,
+ (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset),
+ gotplt->contents + got_offset);
+ rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
+ /* R_386_IRELATIVE comes last. */
+ plt_index = htab->next_irelative_index--;
+ }
+ else
+ {
+ rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
+ plt_index = htab->next_jump_slot_index++;
+ }
+
+ loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
+ bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
+
+ /* Don't fill PLT entry for static executables. */
+ if (plt == htab->elf.splt)
+ {
+ bfd_put_32 (output_bfd,
+ plt_index * sizeof (Elf32_External_Rel),
+ plt->contents + h->plt.offset
+ + abed->plt->plt_reloc_offset);
+ bfd_put_32 (output_bfd, - (h->plt.offset
+ + abed->plt->plt_plt_offset + 4),
+ plt->contents + h->plt.offset
+ + abed->plt->plt_plt_offset);
+ }
}
}
else if (eh->plt_got.offset != (bfd_vma) -1)
abort ();
/* Fill in the entry in the GOT procedure linkage table. */
- if (! info->shared)
+ if (! bfd_link_pic (info))
{
got_plt_entry = elf_i386_got_plt_entry;
got_offset += got->output_section->vma + got->output_offset;
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_i386_hash_entry(h)->tls_type)
- && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
+ && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
+ && !local_undefweak)
{
Elf_Internal_Rela rel;
if (h->def_regular
&& h->type == STT_GNU_IFUNC)
{
- if (info->shared)
+ if (bfd_link_pic (info))
{
/* Generate R_386_GLOB_DAT. */
goto do_glob_dat;
return TRUE;
}
}
- else if (info->shared
+ else if (bfd_link_pic (info)
&& SYMBOL_REFERENCES_LOCAL (info, h))
{
BFD_ASSERT((h->got.offset & 1) != 0);
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_i386_finish_dynamic_symbol. */
+
+static bfd_boolean
+elf_i386_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_i386_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_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
+elf_i386_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_link_hash_table *htab = elf_hash_table (info);
+
+ if (htab->dynsym != NULL
+ && htab->dynsym->contents != NULL)
+ {
+ /* Check relocation against STT_GNU_IFUNC symbol if there are
+ dynamic symbols. */
+ unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
+ Elf_Internal_Sym sym;
+ if (!bed->s->swap_symbol_in (abfd,
+ (htab->dynsym->contents
+ + r_symndx * sizeof (Elf32_External_Sym)),
+ 0, &sym))
+ abort ();
+
+ if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
+ return reloc_class_ifunc;
+ }
+
switch (ELF32_R_TYPE (rela->r_info))
{
case R_386_RELATIVE:
/* Fill in the first entry in the procedure linkage table. */
if (htab->elf.splt && htab->elf.splt->size > 0)
{
- if (info->shared)
+ if (bfd_link_pic (info))
{
memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
abed->plt->plt0_entry_size);
->this_hdr.sh_entsize = 4;
/* Correct the .rel.plt.unloaded relocations. */
- if (abed->is_vxworks && !info->shared)
+ if (abed->is_vxworks && !bfd_link_pic (info))
{
int num_plts = (htab->elf.splt->size
/ abed->plt->plt_entry_size) - 1;
unsigned char *p;
p = htab->srelplt2->contents;
- if (info->shared)
+ if (bfd_link_pic (info))
p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
else
p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
elf_i386_finish_local_dynamic_symbol,
info);
+ /* Fill PLT entries for undefined weak symbols in PIE. */
+ if (bfd_link_pie (info))
+ bfd_hash_traverse (&info->hash->table,
+ elf_i386_pie_finish_undefweak_symbol,
+ info);
+
return TRUE;
}
reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
+ bed->plt->plt_reloc_offset));
reloc_index /= sizeof (Elf32_External_Rel);
- if (reloc_index >= count)
- abort ();
- plt_sym_val[reloc_index] = plt->vma + plt_offset;
+ if (reloc_index < count)
+ plt_sym_val[reloc_index] = plt->vma + plt_offset;
+
plt_offset += bed->plt->plt_entry_size;
+
+ /* PR binutils/18437: Skip extra relocations in the .rel.plt
+ section. */
+ if (plt_offset >= plt->size)
+ break;
}
free (plt_contents);
return _bfd_elf_hash_symbol (h);
}
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-static bfd_boolean
-elf_i386_add_symbol_hook (bfd * abfd,
- struct bfd_link_info * info,
- Elf_Internal_Sym * sym,
- const char ** namep ATTRIBUTE_UNUSED,
- flagword * flagsp ATTRIBUTE_UNUSED,
- asection ** secp ATTRIBUTE_UNUSED,
- bfd_vma * valp ATTRIBUTE_UNUSED)
-{
- 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 TARGET_LITTLE_SYM i386_elf32_vec
#define TARGET_LITTLE_NAME "elf32-i386"
#define ELF_ARCH bfd_arch_i386
#define elf_backend_got_header_size 12
#define elf_backend_plt_alignment 4
#define elf_backend_extern_protected_data 1
+#define elf_backend_caches_rawsize 1
/* Support RELA for objdump of prelink objects. */
#define elf_info_to_howto elf_i386_info_to_howto_rel
#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
-#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
#define elf_backend_grok_prstatus elf_i386_grok_prstatus
#define elf_backend_grok_psinfo elf_i386_grok_psinfo
#define elf_backend_reloc_type_class elf_i386_reloc_type_class
#define elf_backend_omit_section_dynsym \
((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
#define elf_backend_hash_symbol elf_i386_hash_symbol
-#define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
+#define elf_backend_fixup_symbol elf_i386_fixup_symbol
#include "elf32-target.h"
#undef TARGET_LITTLE_NAME
#define TARGET_LITTLE_NAME "elf32-i386-sol2"
+#undef elf_backend_post_process_headers
+
/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
objects won't be recognized. */
#undef ELF_OSABI
/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
boundary. */
-#undef elf_backend_static_tls_alignment
+#undef elf_backend_static_tls_alignment
#define elf_backend_static_tls_alignment 8
/* 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
+
+/* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
+ has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
+ FALSE otherwise. ISECTION is the best guess matching section from the
+ input bfd IBFD, but it might be NULL. */
+
+static bfd_boolean
+elf32_i386_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;
+
+ /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
+ Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
+
+http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
+
+ The following values should be set:
+
+Type Link Info
+-----------------------------------------------------------------------------
+SHT_SUNW_ancillary The section header index of 0
+ [0x6fffffee] the associated string table.
+
+SHT_SUNW_capinfo The section header index of For a dynamic object, the
+ [0x6ffffff0] the associated symbol table. section header index of
+ the associated
+ SHT_SUNW_capchain table,
+ otherwise 0.
+
+SHT_SUNW_symsort The section header index of 0
+ [0x6ffffff1] the associated symbol table.
+
+SHT_SUNW_tlssort The section header index of 0
+ [0x6ffffff2] the associated symbol table.
+
+SHT_SUNW_LDYNSYM The section header index of One greater than the
+ [0x6ffffff3] the associated string table. symbol table index of the
+ This index is the same string last local symbol,
+ table used by the SHT_DYNSYM STB_LOCAL. Since
+ section. SHT_SUNW_LDYNSYM only
+ contains local symbols,
+ sh_info is equivalent to
+ the number of symbols in
+ the table.
+
+SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
+ [0x6ffffff5] the section header index of to named strings, the
+ the associated section header index of
+ SHT_SUNW_capinfo table, the associated string
+ otherwise 0. table, otherwise 0.
+
+SHT_SUNW_move The section header index of 0
+ [0x6ffffffa] the associated symbol table.
+
+SHT_SUNW_COMDAT 0 0
+ [0x6ffffffb]
+
+SHT_SUNW_syminfo The section header index of The section header index
+ [0x6ffffffc] the associated symbol table. of the associated
+ .dynamic section.
+
+SHT_SUNW_verdef The section header index of The number of version
+ [0x6ffffffd] the associated string table. definitions within the
+ section.
+
+SHT_SUNW_verneed The section header index of The number of version
+ [0x6ffffffe] the associated string table. dependencies within the
+ section.
+
+SHT_SUNW_versym The section header index of 0
+ [0x6fffffff] the associated symbol table. */
+}
+
+#undef elf_backend_copy_special_section_fields
+#define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
+
#include "elf32-target.h"
+/* Intel MCU support. */
+
+static bfd_boolean
+elf32_iamcu_elf_object_p (bfd *abfd)
+{
+ /* Set the right machine number for an IAMCU elf32 file. */
+ bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
+ return TRUE;
+}
+
+#undef TARGET_LITTLE_SYM
+#define TARGET_LITTLE_SYM iamcu_elf32_vec
+#undef TARGET_LITTLE_NAME
+#define TARGET_LITTLE_NAME "elf32-iamcu"
+#undef ELF_ARCH
+#define ELF_ARCH bfd_arch_iamcu
+
+#undef ELF_MACHINE_CODE
+#define ELF_MACHINE_CODE EM_IAMCU
+
+#undef ELF_OSABI
+
+#undef elf32_bed
+#define elf32_bed elf32_iamcu_bed
+
+#undef elf_backend_object_p
+#define elf_backend_object_p elf32_iamcu_elf_object_p
+
+#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
+
+#include "elf32-target.h"
+
+/* Restore defaults. */
+#undef ELF_ARCH
+#define ELF_ARCH bfd_arch_i386
+#undef ELF_MACHINE_CODE
+#define ELF_MACHINE_CODE EM_386
+
/* Native Client support. */
#undef TARGET_LITTLE_SYM
projects / deliverable / binutils-gdb.git / blobdiff