blob: 1f058d295683082ccc9604853b8702fda6b01744 [file] [log] [blame]
/* IBM S/390-specific support for 32-bit ELF
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Contributed by Carl B. Pedersen and Martin Schwidefsky.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/s390.h"
static bfd_reloc_status_type
s390_tls_reloc (bfd *, arelent *, asymbol *, void *,
asection *, bfd *, char **);
static bfd_reloc_status_type
s390_elf_ldisp_reloc (bfd *, arelent *, asymbol *, void *,
asection *, bfd *, char **);
/* The relocation "howto" table. */
static reloc_howto_type elf_howto_table[] =
{
HOWTO (R_390_NONE, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = 2 byte, 2 = 4 byte) */
0, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_390_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO(R_390_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_8", FALSE, 0,0x000000ff, FALSE),
HOWTO(R_390_12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
bfd_elf_generic_reloc, "R_390_12", FALSE, 0,0x00000fff, FALSE),
HOWTO(R_390_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_16", FALSE, 0,0x0000ffff, FALSE),
HOWTO(R_390_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_32", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC32", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_GOT12, 0, 1, 12, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOT12", FALSE, 0,0x00000fff, FALSE),
HOWTO(R_390_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOT32", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLT32", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_COPY", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GLOB_DAT", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_JMP_SLOT", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_RELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_RELATIVE", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_GOTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTOFF32", FALSE, 0,0xffffffff, FALSE),
HOWTO(R_390_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTPC", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_GOT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOT16", FALSE, 0,0x0000ffff, FALSE),
HOWTO(R_390_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC16", FALSE, 0,0x0000ffff, TRUE),
HOWTO(R_390_PC16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC16DBL", FALSE, 0,0x0000ffff, TRUE),
HOWTO(R_390_PLT16DBL, 1, 1, 16, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLT16DBL", FALSE, 0,0x0000ffff, TRUE),
HOWTO(R_390_PC32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC32DBL", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_PLT32DBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLT32DBL", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_GOTPCDBL, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTPCDBL", FALSE, 0,0xffffffff, TRUE),
EMPTY_HOWTO (R_390_64), /* Empty entry for R_390_64. */
EMPTY_HOWTO (R_390_PC64), /* Empty entry for R_390_PC64. */
EMPTY_HOWTO (R_390_GOT64), /* Empty entry for R_390_GOT64. */
EMPTY_HOWTO (R_390_PLT64), /* Empty entry for R_390_PLT64. */
HOWTO(R_390_GOTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTENT", FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_GOTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTOFF16", FALSE, 0,0x0000ffff, FALSE),
EMPTY_HOWTO (R_390_GOTOFF64), /* Empty entry for R_390_GOTOFF64. */
HOWTO(R_390_GOTPLT12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
bfd_elf_generic_reloc, "R_390_GOTPLT12", FALSE, 0,0x00000fff, FALSE),
HOWTO(R_390_GOTPLT16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTPLT16", FALSE, 0,0x0000ffff, FALSE),
HOWTO(R_390_GOTPLT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTPLT32", FALSE, 0,0xffffffff, FALSE),
EMPTY_HOWTO (R_390_GOTPLT64), /* Empty entry for R_390_GOTPLT64. */
HOWTO(R_390_GOTPLTENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_GOTPLTENT",FALSE, 0,0xffffffff, TRUE),
HOWTO(R_390_PLTOFF16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLTOFF16", FALSE, 0,0x0000ffff, FALSE),
HOWTO(R_390_PLTOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLTOFF32", FALSE, 0,0xffffffff, FALSE),
EMPTY_HOWTO (R_390_PLTOFF64), /* Empty entry for R_390_PLTOFF64. */
HOWTO(R_390_TLS_LOAD, 0, 0, 0, FALSE, 0, complain_overflow_dont,
s390_tls_reloc, "R_390_TLS_LOAD", FALSE, 0, 0, FALSE),
HOWTO(R_390_TLS_GDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
s390_tls_reloc, "R_390_TLS_GDCALL", FALSE, 0, 0, FALSE),
HOWTO(R_390_TLS_LDCALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
s390_tls_reloc, "R_390_TLS_LDCALL", FALSE, 0, 0, FALSE),
HOWTO(R_390_TLS_GD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_GD32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_GD64), /* Empty entry for R_390_TLS_GD64. */
HOWTO(R_390_TLS_GOTIE12, 0, 1, 12, FALSE, 0, complain_overflow_dont,
bfd_elf_generic_reloc, "R_390_TLS_GOTIE12", FALSE, 0, 0x00000fff, FALSE),
HOWTO(R_390_TLS_GOTIE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_GOTIE32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_GOTIE64), /* Empty entry for R_390_TLS_GOTIE64. */
HOWTO(R_390_TLS_LDM32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_LDM32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_LDM64), /* Empty entry for R_390_TLS_LDM64. */
HOWTO(R_390_TLS_IE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_IE32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_IE64), /* Empty entry for R_390_TLS_IE64. */
HOWTO(R_390_TLS_IEENT, 1, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_IEENT", FALSE, 0, 0xffffffff, TRUE),
HOWTO(R_390_TLS_LE32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_LE32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_LE64), /* Empty entry for R_390_TLS_LE64. */
HOWTO(R_390_TLS_LDO32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_LDO32", FALSE, 0, 0xffffffff, FALSE),
EMPTY_HOWTO (R_390_TLS_LDO64), /* Empty entry for R_390_TLS_LDO64. */
HOWTO(R_390_TLS_DTPMOD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_DTPMOD", FALSE, 0, 0xffffffff, FALSE),
HOWTO(R_390_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_DTPOFF", FALSE, 0, 0xffffffff, FALSE),
HOWTO(R_390_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_TLS_TPOFF", FALSE, 0, 0xffffffff, FALSE),
HOWTO(R_390_20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
s390_elf_ldisp_reloc, "R_390_20", FALSE, 0,0x0fffff00, FALSE),
HOWTO(R_390_GOT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
s390_elf_ldisp_reloc, "R_390_GOT20", FALSE, 0,0x0fffff00, FALSE),
HOWTO(R_390_GOTPLT20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
s390_elf_ldisp_reloc, "R_390_GOTPLT20", FALSE, 0,0x0fffff00, FALSE),
HOWTO(R_390_TLS_GOTIE20, 0, 2, 20, FALSE, 8, complain_overflow_dont,
s390_elf_ldisp_reloc, "R_390_TLS_GOTIE20", FALSE, 0,0x0fffff00, FALSE),
HOWTO(R_390_IRELATIVE, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_IRELATIVE", FALSE, 0, 0xffffffff, FALSE),
HOWTO(R_390_PC12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC12DBL", FALSE, 0,0x00000fff, TRUE),
HOWTO(R_390_PLT12DBL, 1, 1, 12, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLT12DBL", FALSE, 0,0x00000fff, TRUE),
HOWTO(R_390_PC24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PC24DBL", FALSE, 0,0x00ffffff, TRUE),
HOWTO(R_390_PLT24DBL, 1, 2, 24, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_390_PLT24DBL", FALSE, 0,0x00ffffff, TRUE),
};
/* GNU extension to record C++ vtable hierarchy. */
static reloc_howto_type elf32_s390_vtinherit_howto =
HOWTO (R_390_GNU_VTINHERIT, 0,2,0,FALSE,0,complain_overflow_dont, NULL, "R_390_GNU_VTINHERIT", FALSE,0, 0, FALSE);
static reloc_howto_type elf32_s390_vtentry_howto =
HOWTO (R_390_GNU_VTENTRY, 0,2,0,FALSE,0,complain_overflow_dont, _bfd_elf_rel_vtable_reloc_fn,"R_390_GNU_VTENTRY", FALSE,0,0, FALSE);
static reloc_howto_type *
elf_s390_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
switch (code)
{
case BFD_RELOC_NONE:
return &elf_howto_table[(int) R_390_NONE];
case BFD_RELOC_8:
return &elf_howto_table[(int) R_390_8];
case BFD_RELOC_390_12:
return &elf_howto_table[(int) R_390_12];
case BFD_RELOC_16:
return &elf_howto_table[(int) R_390_16];
case BFD_RELOC_32:
return &elf_howto_table[(int) R_390_32];
case BFD_RELOC_CTOR:
return &elf_howto_table[(int) R_390_32];
case BFD_RELOC_32_PCREL:
return &elf_howto_table[(int) R_390_PC32];
case BFD_RELOC_390_GOT12:
return &elf_howto_table[(int) R_390_GOT12];
case BFD_RELOC_32_GOT_PCREL:
return &elf_howto_table[(int) R_390_GOT32];
case BFD_RELOC_390_PLT32:
return &elf_howto_table[(int) R_390_PLT32];
case BFD_RELOC_390_COPY:
return &elf_howto_table[(int) R_390_COPY];
case BFD_RELOC_390_GLOB_DAT:
return &elf_howto_table[(int) R_390_GLOB_DAT];
case BFD_RELOC_390_JMP_SLOT:
return &elf_howto_table[(int) R_390_JMP_SLOT];
case BFD_RELOC_390_RELATIVE:
return &elf_howto_table[(int) R_390_RELATIVE];
case BFD_RELOC_32_GOTOFF:
return &elf_howto_table[(int) R_390_GOTOFF32];
case BFD_RELOC_390_GOTPC:
return &elf_howto_table[(int) R_390_GOTPC];
case BFD_RELOC_390_GOT16:
return &elf_howto_table[(int) R_390_GOT16];
case BFD_RELOC_16_PCREL:
return &elf_howto_table[(int) R_390_PC16];
case BFD_RELOC_390_PC12DBL:
return &elf_howto_table[(int) R_390_PC12DBL];
case BFD_RELOC_390_PLT12DBL:
return &elf_howto_table[(int) R_390_PLT12DBL];
case BFD_RELOC_390_PC16DBL:
return &elf_howto_table[(int) R_390_PC16DBL];
case BFD_RELOC_390_PLT16DBL:
return &elf_howto_table[(int) R_390_PLT16DBL];
case BFD_RELOC_390_PC24DBL:
return &elf_howto_table[(int) R_390_PC24DBL];
case BFD_RELOC_390_PLT24DBL:
return &elf_howto_table[(int) R_390_PLT24DBL];
case BFD_RELOC_390_PC32DBL:
return &elf_howto_table[(int) R_390_PC32DBL];
case BFD_RELOC_390_PLT32DBL:
return &elf_howto_table[(int) R_390_PLT32DBL];
case BFD_RELOC_390_GOTPCDBL:
return &elf_howto_table[(int) R_390_GOTPCDBL];
case BFD_RELOC_390_GOTENT:
return &elf_howto_table[(int) R_390_GOTENT];
case BFD_RELOC_16_GOTOFF:
return &elf_howto_table[(int) R_390_GOTOFF16];
case BFD_RELOC_390_GOTPLT12:
return &elf_howto_table[(int) R_390_GOTPLT12];
case BFD_RELOC_390_GOTPLT16:
return &elf_howto_table[(int) R_390_GOTPLT16];
case BFD_RELOC_390_GOTPLT32:
return &elf_howto_table[(int) R_390_GOTPLT32];
case BFD_RELOC_390_GOTPLTENT:
return &elf_howto_table[(int) R_390_GOTPLTENT];
case BFD_RELOC_390_PLTOFF16:
return &elf_howto_table[(int) R_390_PLTOFF16];
case BFD_RELOC_390_PLTOFF32:
return &elf_howto_table[(int) R_390_PLTOFF32];
case BFD_RELOC_390_TLS_LOAD:
return &elf_howto_table[(int) R_390_TLS_LOAD];
case BFD_RELOC_390_TLS_GDCALL:
return &elf_howto_table[(int) R_390_TLS_GDCALL];
case BFD_RELOC_390_TLS_LDCALL:
return &elf_howto_table[(int) R_390_TLS_LDCALL];
case BFD_RELOC_390_TLS_GD32:
return &elf_howto_table[(int) R_390_TLS_GD32];
case BFD_RELOC_390_TLS_GOTIE12:
return &elf_howto_table[(int) R_390_TLS_GOTIE12];
case BFD_RELOC_390_TLS_GOTIE32:
return &elf_howto_table[(int) R_390_TLS_GOTIE32];
case BFD_RELOC_390_TLS_LDM32:
return &elf_howto_table[(int) R_390_TLS_LDM32];
case BFD_RELOC_390_TLS_IE32:
return &elf_howto_table[(int) R_390_TLS_IE32];
case BFD_RELOC_390_TLS_IEENT:
return &elf_howto_table[(int) R_390_TLS_IEENT];
case BFD_RELOC_390_TLS_LE32:
return &elf_howto_table[(int) R_390_TLS_LE32];
case BFD_RELOC_390_TLS_LDO32:
return &elf_howto_table[(int) R_390_TLS_LDO32];
case BFD_RELOC_390_TLS_DTPMOD:
return &elf_howto_table[(int) R_390_TLS_DTPMOD];
case BFD_RELOC_390_TLS_DTPOFF:
return &elf_howto_table[(int) R_390_TLS_DTPOFF];
case BFD_RELOC_390_TLS_TPOFF:
return &elf_howto_table[(int) R_390_TLS_TPOFF];
case BFD_RELOC_390_20:
return &elf_howto_table[(int) R_390_20];
case BFD_RELOC_390_GOT20:
return &elf_howto_table[(int) R_390_GOT20];
case BFD_RELOC_390_GOTPLT20:
return &elf_howto_table[(int) R_390_GOTPLT20];
case BFD_RELOC_390_TLS_GOTIE20:
return &elf_howto_table[(int) R_390_TLS_GOTIE20];
case BFD_RELOC_390_IRELATIVE:
return &elf_howto_table[(int) R_390_IRELATIVE];
case BFD_RELOC_VTABLE_INHERIT:
return &elf32_s390_vtinherit_howto;
case BFD_RELOC_VTABLE_ENTRY:
return &elf32_s390_vtentry_howto;
default:
break;
}
return 0;
}
static reloc_howto_type *
elf_s390_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
if (elf_howto_table[i].name != NULL
&& strcasecmp (elf_howto_table[i].name, r_name) == 0)
return &elf_howto_table[i];
if (strcasecmp (elf32_s390_vtinherit_howto.name, r_name) == 0)
return &elf32_s390_vtinherit_howto;
if (strcasecmp (elf32_s390_vtentry_howto.name, r_name) == 0)
return &elf32_s390_vtentry_howto;
return NULL;
}
/* We need to use ELF32_R_TYPE so we have our own copy of this function,
and elf32-s390.c has its own copy. */
static void
elf_s390_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE(dst->r_info);
switch (r_type)
{
case R_390_GNU_VTINHERIT:
cache_ptr->howto = &elf32_s390_vtinherit_howto;
break;
case R_390_GNU_VTENTRY:
cache_ptr->howto = &elf32_s390_vtentry_howto;
break;
default:
if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
{
(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
abfd, (int) r_type);
r_type = R_390_NONE;
}
cache_ptr->howto = &elf_howto_table[r_type];
}
}
/* A relocation function which doesn't do anything. */
static bfd_reloc_status_type
s390_tls_reloc (bfd *abfd ATTRIBUTE_UNUSED,
arelent *reloc_entry,
asymbol *symbol ATTRIBUTE_UNUSED,
void * data ATTRIBUTE_UNUSED,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
if (output_bfd)
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
/* Handle the large displacement relocs. */
static bfd_reloc_status_type
s390_elf_ldisp_reloc (bfd *abfd ATTRIBUTE_UNUSED,
arelent *reloc_entry,
asymbol *symbol,
void * data ATTRIBUTE_UNUSED,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
reloc_howto_type *howto = reloc_entry->howto;
bfd_vma relocation;
bfd_vma insn;
if (output_bfd != (bfd *) NULL
&& (symbol->flags & BSF_SECTION_SYM) == 0
&& (! howto->partial_inplace
|| reloc_entry->addend == 0))
{
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (output_bfd != NULL)
return bfd_reloc_continue;
if (reloc_entry->address > bfd_get_section_limit (abfd, input_section))
return bfd_reloc_outofrange;
relocation = (symbol->value
+ symbol->section->output_section->vma
+ symbol->section->output_offset);
relocation += reloc_entry->addend;
if (howto->pc_relative)
{
relocation -= (input_section->output_section->vma
+ input_section->output_offset);
relocation -= reloc_entry->address;
}
insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
insn |= (relocation & 0xfff) << 16 | (relocation & 0xff000) >> 4;
bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
if ((bfd_signed_vma) relocation < - 0x80000
|| (bfd_signed_vma) relocation > 0x7ffff)
return bfd_reloc_overflow;
else
return bfd_reloc_ok;
}
static bfd_boolean
elf_s390_is_local_label_name (bfd *abfd, const char *name)
{
if (name[0] == '.' && (name[1] == 'X' || name[1] == 'L'))
return TRUE;
return _bfd_elf_is_local_label_name (abfd, name);
}
/* Functions for the 390 ELF linker. */
/* The name of the dynamic interpreter. This is put in the .interp
section. */
#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so.1"
/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
copying dynamic variables from a shared lib into an app's dynbss
section, and instead use a dynamic relocation to point into the
shared lib. */
#define ELIMINATE_COPY_RELOCS 1
/* The size in bytes of the first entry in the procedure linkage table. */
#define PLT_FIRST_ENTRY_SIZE 32
/* The size in bytes of an entry in the procedure linkage table. */
#define PLT_ENTRY_SIZE 32
#define GOT_ENTRY_SIZE 4
#define RELA_ENTRY_SIZE sizeof (Elf32_External_Rela)
/* The first three entries in a procedure linkage table are reserved,
and the initial contents are unimportant (we zero them out).
Subsequent entries look like this. See the SVR4 ABI 386
supplement to see how this works. */
/* For the s390, simple addr offset can only be 0 - 4096.
To use the full 2 GB address space, several instructions
are needed to load an address in a register and execute
a branch( or just saving the address)
Furthermore, only r 0 and 1 are free to use!!! */
/* The first 3 words in the GOT are then reserved.
Word 0 is the address of the dynamic table.
Word 1 is a pointer to a structure describing the object
Word 2 is used to point to the loader entry address.
The code for position independent PLT entries looks like this:
r12 holds addr of the current GOT at entry to the PLT
The GOT holds the address in the PLT to be executed.
The loader then gets:
24(15) = Pointer to the structure describing the object.
28(15) = Offset into rela.plt
The loader must then find the module where the function is
and insert the address in the GOT.
Note: 390 can only address +- 64 K relative.
We check if offset > 65536, then make a relative branch -64xxx
back to a previous defined branch
PLT1: BASR 1,0 # 2 bytes
L 1,22(1) # 4 bytes Load offset in GOT in r 1
L 1,(1,12) # 4 bytes Load address from GOT in r1
BCR 15,1 # 2 bytes Jump to address
RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
L 1,14(1) # 4 bytes Load offset in symol table in r1
BRC 15,-x # 4 bytes Jump to start of PLT
.word 0 # 2 bytes filler
.long ? # 4 bytes offset in GOT
.long ? # 4 bytes offset into rela.plt
This was the general case. There are two additional, optimizes PLT
definitions. One for GOT offsets < 4096 and one for GOT offsets < 32768.
First the one for GOT offsets < 4096:
PLT1: L 1,<offset>(12) # 4 bytes Load address from GOT in R1
BCR 15,1 # 2 bytes Jump to address
.word 0,0,0 # 6 bytes filler
RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
L 1,14(1) # 4 bytes Load offset in rela.plt in r1
BRC 15,-x # 4 bytes Jump to start of PLT
.word 0,0,0 # 6 bytes filler
.long ? # 4 bytes offset into rela.plt
Second the one for GOT offsets < 32768:
PLT1: LHI 1,<offset> # 4 bytes Load offset in GOT to r1
L 1,(1,12) # 4 bytes Load address from GOT to r1
BCR 15,1 # 2 bytes Jump to address
.word 0 # 2 bytes filler
RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
L 1,14(1) # 4 bytes Load offset in rela.plt in r1
BRC 15,-x # 4 bytes Jump to start of PLT
.word 0,0,0 # 6 bytes filler
.long ? # 4 bytes offset into rela.plt
Total = 32 bytes per PLT entry
The code for static build PLT entries looks like this:
PLT1: BASR 1,0 # 2 bytes
L 1,22(1) # 4 bytes Load address of GOT entry
L 1,0(0,1) # 4 bytes Load address from GOT in r1
BCR 15,1 # 2 bytes Jump to address
RET1: BASR 1,0 # 2 bytes Return from GOT 1st time
L 1,14(1) # 4 bytes Load offset in symbol table in r1
BRC 15,-x # 4 bytes Jump to start of PLT
.word 0 # 2 bytes filler
.long ? # 4 bytes address of GOT entry
.long ? # 4 bytes offset into rela.plt */
static const bfd_byte elf_s390_plt_entry[PLT_ENTRY_SIZE] =
{
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
0x58, 0x10, 0x10, 0x00, /* l %r1,0(%r1) */
0x07, 0xf1, /* br %r1 */
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
0xa7, 0xf4, 0x00, 0x00, /* j first plt */
0x00, 0x00, /* padding */
0x00, 0x00, 0x00, 0x00, /* GOT offset */
0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
};
/* Generic PLT pic entry. */
static const bfd_byte elf_s390_plt_pic_entry[PLT_ENTRY_SIZE] =
{
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x16, /* l %r1,22(%r1) */
0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
0x07, 0xf1, /* br %r1 */
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
0xa7, 0xf4, 0x00, 0x00, /* j first plt */
0x00, 0x00, /* padding */
0x00, 0x00, 0x00, 0x00, /* GOT offset */
0x00, 0x00, 0x00, 0x00 /* rela.plt offset */
};
/* Optimized PLT pic entry for GOT offset < 4k. xx will be replaced
when generating the PLT slot with the GOT offset. */
static const bfd_byte elf_s390_plt_pic12_entry[PLT_ENTRY_SIZE] =
{
0x58, 0x10, 0xc0, 0x00, /* l %r1,xx(%r12) */
0x07, 0xf1, /* br %r1 */
0x00, 0x00, 0x00, 0x00, /* padding */
0x00, 0x00,
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
0xa7, 0xf4, 0x00, 0x00, /* j first plt */
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
/* Optimized PLT pic entry for GOT offset < 32k. xx will be replaced
when generating the PLT slot with the GOT offset. */
static const bfd_byte elf_s390_plt_pic16_entry[PLT_ENTRY_SIZE] =
{
0xa7, 0x18, 0x00, 0x00, /* lhi %r1,xx */
0x58, 0x11, 0xc0, 0x00, /* l %r1,0(%r1,%r12) */
0x07, 0xf1, /* br %r1 */
0x00, 0x00,
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x0e, /* l %r1,14(%r1) */
0xa7, 0xf4, 0x00, 0x00, /* j first plt */
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
/* The first PLT entry pushes the offset into the rela.plt
from R1 onto the stack at 8(15) and the loader object info
at 12(15), loads the loader address in R1 and jumps to it. */
/* The first entry in the PLT for PIC code:
PLT0:
ST 1,28(15) # R1 has offset into rela.plt
L 1,4(12) # Get loader ino(object struct address)
ST 1,24(15) # Store address
L 1,8(12) # Entry address of loader in R1
BR 1 # Jump to loader
The first entry in the PLT for static code:
PLT0:
ST 1,28(15) # R1 has offset into rela.plt
BASR 1,0
L 1,18(0,1) # Get address of GOT
MVC 24(4,15),4(1) # Move loader ino to stack
L 1,8(1) # Get address of loader
BR 1 # Jump to loader
.word 0 # filler
.long got # address of GOT */
static const bfd_byte elf_s390_plt_first_entry[PLT_FIRST_ENTRY_SIZE] =
{
0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
0x0d, 0x10, /* basr %r1,%r0 */
0x58, 0x10, 0x10, 0x12, /* l %r1,18(%r1) */
0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, /* mvc 24(4,%r15),4(%r1) */
0x58, 0x10, 0x10, 0x08, /* l %r1,8(%r1) */
0x07, 0xf1, /* br %r1 */
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
static const bfd_byte elf_s390_plt_pic_first_entry[PLT_FIRST_ENTRY_SIZE] =
{
0x50, 0x10, 0xf0, 0x1c, /* st %r1,28(%r15) */
0x58, 0x10, 0xc0, 0x04, /* l %r1,4(%r12) */
0x50, 0x10, 0xf0, 0x18, /* st %r1,24(%r15) */
0x58, 0x10, 0xc0, 0x08, /* l %r1,8(%r12) */
0x07, 0xf1, /* br %r1 */
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
/* s390 ELF linker hash entry. */
struct elf_s390_link_hash_entry
{
struct elf_link_hash_entry elf;
/* Track dynamic relocs copied for this symbol. */
struct elf_dyn_relocs *dyn_relocs;
/* Number of GOTPLT references for a function. */
bfd_signed_vma gotplt_refcount;
#define GOT_UNKNOWN 0
#define GOT_NORMAL 1
#define GOT_TLS_GD 2
#define GOT_TLS_IE 3
#define GOT_TLS_IE_NLT 4
unsigned char tls_type;
/* For pointer equality reasons we might need to change the symbol
type from STT_GNU_IFUNC to STT_FUNC together with its value and
section entry. So after alloc_dynrelocs only these values should
be used. In order to check whether a symbol is IFUNC use
s390_is_ifunc_symbol_p. */
bfd_vma ifunc_resolver_address;
asection *ifunc_resolver_section;
};
#define elf_s390_hash_entry(ent) \
((struct elf_s390_link_hash_entry *)(ent))
/* This structure represents an entry in the local PLT list needed for
local IFUNC symbols. */
struct plt_entry
{
/* The section of the local symbol.
Set in relocate_section and used in finish_dynamic_sections. */
asection *sec;
union
{
bfd_signed_vma refcount;
bfd_vma offset;
} plt;
};
/* NOTE: Keep this structure in sync with
the one declared in elf64-s390.c. */
struct elf_s390_obj_tdata
{
struct elf_obj_tdata root;
/* A local PLT is needed for ifunc symbols. */
struct plt_entry *local_plt;
/* TLS type for each local got entry. */
char *local_got_tls_type;
};
#define elf_s390_tdata(abfd) \
((struct elf_s390_obj_tdata *) (abfd)->tdata.any)
#define elf_s390_local_plt(abfd) \
(elf_s390_tdata (abfd)->local_plt)
#define elf_s390_local_got_tls_type(abfd) \
(elf_s390_tdata (abfd)->local_got_tls_type)
#define is_s390_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& elf_tdata (bfd) != NULL \
&& elf_object_id (bfd) == S390_ELF_DATA)
static bfd_boolean
elf_s390_mkobject (bfd *abfd)
{
return bfd_elf_allocate_object (abfd, sizeof (struct elf_s390_obj_tdata),
S390_ELF_DATA);
}
static bfd_boolean
elf_s390_object_p (bfd *abfd)
{
/* Set the right machine number for an s390 elf32 file. */
return bfd_default_set_arch_mach (abfd, bfd_arch_s390, bfd_mach_s390_31);
}
/* s390 ELF linker hash table. */
struct elf_s390_link_hash_table
{
struct elf_link_hash_table elf;
/* Short-cuts to get to dynamic linker sections. */
asection *sdynbss;
asection *srelbss;
asection *irelifunc;
union
{
bfd_signed_vma refcount;
bfd_vma offset;
} tls_ldm_got;
/* Small local sym cache. */
struct sym_cache sym_cache;
};
/* Get the s390 ELF linker hash table from a link_info structure. */
#define elf_s390_hash_table(p) \
(elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
== S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
#undef ELF64
#include "elf-s390-common.c"
/* Create an entry in an s390 ELF linker hash table. */
static struct bfd_hash_entry *
link_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (entry == NULL)
{
entry = bfd_hash_allocate (table,
sizeof (struct elf_s390_link_hash_entry));
if (entry == NULL)
return entry;
}
/* Call the allocation method of the superclass. */
entry = _bfd_elf_link_hash_newfunc (entry, table, string);
if (entry != NULL)
{
struct elf_s390_link_hash_entry *eh;
eh = (struct elf_s390_link_hash_entry *) entry;
eh->dyn_relocs = NULL;
eh->gotplt_refcount = 0;
eh->tls_type = GOT_UNKNOWN;
eh->ifunc_resolver_address = 0;
eh->ifunc_resolver_section = NULL;
}
return entry;
}
/* Create an s390 ELF linker hash table. */
static struct bfd_link_hash_table *
elf_s390_link_hash_table_create (bfd *abfd)
{
struct elf_s390_link_hash_table *ret;
bfd_size_type amt = sizeof (struct elf_s390_link_hash_table);
ret = (struct elf_s390_link_hash_table *) bfd_zmalloc (amt);
if (ret == NULL)
return NULL;
if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
sizeof (struct elf_s390_link_hash_entry),
S390_ELF_DATA))
{
free (ret);
return NULL;
}
return &ret->elf.root;
}
/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
shortcuts to them in our hash table. */
static bfd_boolean
create_got_section (bfd *dynobj, struct bfd_link_info *info)
{
struct elf_s390_link_hash_table *htab;
if (! _bfd_elf_create_got_section (dynobj, info))
return FALSE;
htab = elf_s390_hash_table (info);
htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
abort ();
return TRUE;
}
/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
.rela.bss sections in DYNOBJ, and set up shortcuts to them in our
hash table. */
static bfd_boolean
elf_s390_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
{
struct elf_s390_link_hash_table *htab;
htab = elf_s390_hash_table (info);
if (!htab->elf.sgot && !create_got_section (dynobj, info))
return FALSE;
if (!_bfd_elf_create_dynamic_sections (dynobj, info))
return FALSE;
htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
if (!bfd_link_pic (info))
htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
|| (!bfd_link_pic (info) && !htab->srelbss))
abort ();
return TRUE;
}
/* Copy the extra info we tack onto an elf_link_hash_entry. */
static void
elf_s390_copy_indirect_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *dir,
struct elf_link_hash_entry *ind)
{
struct elf_s390_link_hash_entry *edir, *eind;
edir = (struct elf_s390_link_hash_entry *) dir;
eind = (struct elf_s390_link_hash_entry *) ind;
if (eind->dyn_relocs != NULL)
{
if (edir->dyn_relocs != NULL)
{
struct elf_dyn_relocs **pp;
struct elf_dyn_relocs *p;
/* Add reloc counts against the indirect sym to the direct sym
list. Merge any entries against the same section. */
for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
{
struct elf_dyn_relocs *q;
for (q = edir->dyn_relocs; q != NULL; q = q->next)
if (q->sec == p->sec)
{
q->pc_count += p->pc_count;
q->count += p->count;
*pp = p->next;
break;
}
if (q == NULL)
pp = &p->next;
}
*pp = edir->dyn_relocs;
}
edir->dyn_relocs = eind->dyn_relocs;
eind->dyn_relocs = NULL;
}
if (ind->root.type == bfd_link_hash_indirect
&& dir->got.refcount <= 0)
{
edir->tls_type = eind->tls_type;
eind->tls_type = GOT_UNKNOWN;
}
if (ELIMINATE_COPY_RELOCS
&& ind->root.type != bfd_link_hash_indirect
&& dir->dynamic_adjusted)
{
/* If called to transfer flags for a weakdef during processing
of elf_adjust_dynamic_symbol, don't copy non_got_ref.
We clear it ourselves for ELIMINATE_COPY_RELOCS. */
dir->ref_dynamic |= ind->ref_dynamic;
dir->ref_regular |= ind->ref_regular;
dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
dir->needs_plt |= ind->needs_plt;
}
else
_bfd_elf_link_hash_copy_indirect (info, dir, ind);
}
static int
elf_s390_tls_transition (struct bfd_link_info *info,
int r_type,
int is_local)
{
if (bfd_link_pic (info))
return r_type;
switch (r_type)
{
case R_390_TLS_GD32:
case R_390_TLS_IE32:
if (is_local)
return R_390_TLS_LE32;
return R_390_TLS_IE32;
case R_390_TLS_GOTIE32:
if (is_local)
return R_390_TLS_LE32;
return R_390_TLS_GOTIE32;
case R_390_TLS_LDM32:
return R_390_TLS_LE32;
}
return r_type;
}
/* Look through the relocs for a section during the first phase, and
allocate space in the global offset table or procedure linkage
table. */
static bfd_boolean
elf_s390_check_relocs (bfd *abfd,
struct bfd_link_info *info,
asection *sec,
const Elf_Internal_Rela *relocs)
{
struct elf_s390_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
asection *sreloc;
bfd_signed_vma *local_got_refcounts;
int tls_type, old_tls_type;
Elf_Internal_Sym *isym;
if (bfd_link_relocatable (info))
return TRUE;
BFD_ASSERT (is_s390_elf (abfd));
htab = elf_s390_hash_table (info);
symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = elf_sym_hashes (abfd);
local_got_refcounts = elf_local_got_refcounts (abfd);
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
unsigned int r_type;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
(*_bfd_error_handler) (_("%B: bad symbol index: %d"),
abfd, r_symndx);
return FALSE;
}
if (r_symndx < symtab_hdr->sh_info)
{
/* A local symbol. */
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
return FALSE;
if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
{
struct plt_entry *plt;
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
return FALSE;
if (local_got_refcounts == NULL)
{
if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
return FALSE;
local_got_refcounts = elf_local_got_refcounts (abfd);
}
plt = elf_s390_local_plt (abfd);
plt[r_symndx].plt.refcount++;
}
h = NULL;
}
else
{
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;
/* PR15323, ref flags aren't set for references in the same
object. */
h->root.non_ir_ref = 1;
}
/* Create got section and local_got_refcounts array if they
are needed. */
r_type = elf_s390_tls_transition (info,
ELF32_R_TYPE (rel->r_info),
h == NULL);
switch (r_type)
{
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
case R_390_GOTPLT12:
case R_390_GOTPLT16:
case R_390_GOTPLT20:
case R_390_GOTPLT32:
case R_390_GOTPLTENT:
case R_390_TLS_GD32:
case R_390_TLS_GOTIE12:
case R_390_TLS_GOTIE20:
case R_390_TLS_GOTIE32:
case R_390_TLS_IEENT:
case R_390_TLS_IE32:
case R_390_TLS_LDM32:
if (h == NULL
&& local_got_refcounts == NULL)
{
if (!elf_s390_allocate_local_syminfo (abfd, symtab_hdr))
return FALSE;
local_got_refcounts = elf_local_got_refcounts (abfd);
}
/* Fall through. */
case R_390_GOTOFF16:
case R_390_GOTOFF32:
case R_390_GOTPC:
case R_390_GOTPCDBL:
if (htab->elf.sgot == NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!create_got_section (htab->elf.dynobj, info))
return FALSE;
}
}
if (h != NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!s390_elf_create_ifunc_sections (htab->elf.dynobj, info))
return FALSE;
/* Make sure an IFUNC symbol defined in a non-shared object
always gets a PLT slot. */
if (s390_is_ifunc_symbol_p (h) && h->def_regular)
{
/* The symbol is called by the dynamic loader in order
to resolve the relocation. So it is in fact also
referenced. */
h->ref_regular = 1;
h->needs_plt = 1;
}
}
switch (r_type)
{
case R_390_GOTPC:
case R_390_GOTPCDBL:
/* These relocs do not need a GOT slot. They just load the
GOT pointer itself or address something else relative to
the GOT. Since the GOT pointer has been set up above we
are done. */
break;
case R_390_GOTOFF16:
case R_390_GOTOFF32:
if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
break;
case R_390_PLT12DBL:
case R_390_PLT16DBL:
case R_390_PLT24DBL:
case R_390_PLT32DBL:
case R_390_PLT32:
case R_390_PLTOFF16:
case R_390_PLTOFF32:
/* This symbol requires a procedure linkage table entry. We
actually build the entry in adjust_dynamic_symbol,
because this might be a case of linking PIC code which is
never referenced by a dynamic object, in which case we
don't need to generate a procedure linkage table entry
after all. */
/* If this is a local symbol, we resolve it directly without
creating a procedure linkage table entry. */
if (h != NULL)
{
h->needs_plt = 1;
h->plt.refcount += 1;
}
break;
case R_390_GOTPLT12:
case R_390_GOTPLT16:
case R_390_GOTPLT20:
case R_390_GOTPLT32:
case R_390_GOTPLTENT:
/* This symbol requires either a procedure linkage table entry
or an entry in the local got. We actually build the entry
in adjust_dynamic_symbol because whether this is really a
global reference can change and with it the fact if we have
to create a plt entry or a local got entry. To be able to
make a once global symbol a local one we have to keep track
of the number of gotplt references that exist for this
symbol. */
if (h != NULL)
{
((struct elf_s390_link_hash_entry *) h)->gotplt_refcount++;
h->needs_plt = 1;
h->plt.refcount += 1;
}
else
local_got_refcounts[r_symndx] += 1;
break;
case R_390_TLS_LDM32:
htab->tls_ldm_got.refcount += 1;
break;
case R_390_TLS_IE32:
case R_390_TLS_GOTIE12:
case R_390_TLS_GOTIE20:
case R_390_TLS_GOTIE32:
case R_390_TLS_IEENT:
if (bfd_link_pic (info))
info->flags |= DF_STATIC_TLS;
/* Fall through. */
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
case R_390_TLS_GD32:
/* This symbol requires a global offset table entry. */
switch (r_type)
{
default:
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
tls_type = GOT_NORMAL;
break;
case R_390_TLS_GD32:
tls_type = GOT_TLS_GD;
break;
case R_390_TLS_IE32:
case R_390_TLS_GOTIE32:
tls_type = GOT_TLS_IE;
break;
case R_390_TLS_GOTIE12:
case R_390_TLS_GOTIE20:
case R_390_TLS_IEENT:
tls_type = GOT_TLS_IE_NLT;
break;
}
if (h != NULL)
{
h->got.refcount += 1;
old_tls_type = elf_s390_hash_entry(h)->tls_type;
}
else
{
local_got_refcounts[r_symndx] += 1;
old_tls_type = elf_s390_local_got_tls_type (abfd) [r_symndx];
}
/* If a TLS symbol is accessed using IE at least once,
there is no point to use dynamic model for it. */
if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN)
{
if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
{
(*_bfd_error_handler)
(_("%B: `%s' accessed both as normal and thread local symbol"),
abfd, h->root.root.string);
return FALSE;
}
if (old_tls_type > tls_type)
tls_type = old_tls_type;
}
if (old_tls_type != tls_type)
{
if (h != NULL)
elf_s390_hash_entry (h)->tls_type = tls_type;
else
elf_s390_local_got_tls_type (abfd) [r_symndx] = tls_type;
}
if (r_type != R_390_TLS_IE32)
break;
/* Fall through. */
case R_390_TLS_LE32:
/* For static linking and executables this reloc will be
calculated at linktime otherwise a TLS_TPOFF runtime
reloc will be generated. */
if (r_type == R_390_TLS_LE32 && bfd_link_pie (info))
break;
if (!bfd_link_pic (info))
break;
info->flags |= DF_STATIC_TLS;
/* Fall through. */
case R_390_8:
case R_390_16:
case R_390_32:
case R_390_PC16:
case R_390_PC12DBL:
case R_390_PC16DBL:
case R_390_PC24DBL:
case R_390_PC32DBL:
case R_390_PC32:
if (h != NULL && bfd_link_executable (info))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this
stage whether the section is read-only, as input
sections have not yet been mapped to output sections.
Tentatively set the flag for now, and correct in
adjust_dynamic_symbol. */
h->non_got_ref = 1;
if (!bfd_link_pic (info))
{
/* We may need a .plt entry if the function this reloc
refers to is in a shared lib. */
h->plt.refcount += 1;
}
}
/* If we are creating a shared library, and this is a reloc
against a global symbol, or a non PC relative reloc
against a local symbol, then we need to copy the reloc
into the shared library. However, if we are linking with
-Bsymbolic, we do not need to copy a reloc against a
global symbol which is defined in an object we are
including in the link (i.e., DEF_REGULAR is set). At
this point we have not seen all the input files, so it is
possible that DEF_REGULAR is not set now but will be set
later (it is never cleared). In case of a weak definition,
DEF_REGULAR may be cleared later by a strong definition in
a shared library. We account for that possibility below by
storing information in the relocs_copied field of the hash
table entry. A similar situation occurs when creating
shared libraries and symbol visibility changes render the
symbol local.
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 ((bfd_link_pic (info)
&& (sec->flags & SEC_ALLOC) != 0
&& ((ELF32_R_TYPE (rel->r_info) != R_390_PC16
&& ELF32_R_TYPE (rel->r_info) != R_390_PC12DBL
&& ELF32_R_TYPE (rel->r_info) != R_390_PC16DBL
&& ELF32_R_TYPE (rel->r_info) != R_390_PC24DBL
&& ELF32_R_TYPE (rel->r_info) != R_390_PC32DBL
&& ELF32_R_TYPE (rel->r_info) != R_390_PC32)
|| (h != NULL
&& (! SYMBOLIC_BIND (info, h)
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
|| (ELIMINATE_COPY_RELOCS
&& !bfd_link_pic (info)
&& (sec->flags & SEC_ALLOC) != 0
&& h != NULL
&& (h->root.type == bfd_link_hash_defweak
|| !h->def_regular)))
{
struct elf_dyn_relocs *p;
struct elf_dyn_relocs **head;
/* We must copy these reloc types into the output file.
Create a reloc section in dynobj and make room for
this reloc. */
if (sreloc == NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
sreloc = _bfd_elf_make_dynamic_reloc_section
(sec, htab->elf.dynobj, 2, abfd, /*rela?*/ TRUE);
if (sreloc == NULL)
return FALSE;
}
/* If this is a global symbol, we count the number of
relocations we need for this symbol. */
if (h != NULL)
{
head = &((struct elf_s390_link_hash_entry *) h)->dyn_relocs;
}
else
{
/* Track dynamic relocs needed for local syms too.
We really need local syms available to do this
easily. Oh well. */
asection *s;
void *vpp;
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
return FALSE;
s = bfd_section_from_elf_index (abfd, isym->st_shndx);
if (s == NULL)
s = sec;
vpp = &elf_section_data (s)->local_dynrel;
head = (struct elf_dyn_relocs **) vpp;
}
p = *head;
if (p == NULL || p->sec != sec)
{
bfd_size_type amt = sizeof *p;
p = ((struct elf_dyn_relocs *)
bfd_alloc (htab->elf.dynobj, amt));
if (p == NULL)
return FALSE;
p->next = *head;
*head = p;
p->sec = sec;
p->count = 0;
p->pc_count = 0;
}
p->count += 1;
if (ELF32_R_TYPE (rel->r_info) == R_390_PC16
|| ELF32_R_TYPE (rel->r_info) == R_390_PC12DBL
|| ELF32_R_TYPE (rel->r_info) == R_390_PC16DBL
|| ELF32_R_TYPE (rel->r_info) == R_390_PC24DBL
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32DBL
|| ELF32_R_TYPE (rel->r_info) == R_390_PC32)
p->pc_count += 1;
}
break;
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_390_GNU_VTINHERIT:
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
return FALSE;
break;
/* This relocation describes which C++ vtable entries are actually
used. Record for later use during GC. */
case R_390_GNU_VTENTRY:
BFD_ASSERT (h != NULL);
if (h != NULL
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
return FALSE;
break;
default:
break;
}
}
return TRUE;
}
/* Return the section that should be marked against GC for a given
relocation. */
static asection *
elf_s390_gc_mark_hook (asection *sec,
struct bfd_link_info *info,
Elf_Internal_Rela *rel,
struct elf_link_hash_entry *h,
Elf_Internal_Sym *sym)
{
if (h != NULL)
switch (ELF32_R_TYPE (rel->r_info))
{
case R_390_GNU_VTINHERIT:
case R_390_GNU_VTENTRY:
return NULL;
}
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
/* Update the got entry reference counts for the section being removed. */
static bfd_boolean
elf_s390_gc_sweep_hook (bfd *abfd,
struct bfd_link_info *info,
asection *sec,
const Elf_Internal_Rela *relocs)
{
struct elf_s390_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 (bfd_link_relocatable (info))
return TRUE;
htab = elf_s390_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++)
{
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)
{
struct elf_s390_link_hash_entry *eh;
struct elf_dyn_relocs **pp;
struct elf_dyn_relocs *p;
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;
eh = (struct elf_s390_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;
}
}
else
{
Elf_Internal_Sym *isym;
/* A local symbol. */
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
return FALSE;
if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
{
struct plt_entry *plt = elf_s390_local_plt (abfd);
if (plt[r_symndx].plt.refcount > 0)
plt[r_symndx].plt.refcount--;
}
}
r_type = ELF32_R_TYPE (rel->r_info);
r_type = elf_s390_tls_transition (info, r_type, h != NULL);
switch (r_type)
{
case R_390_TLS_LDM32:
if (elf_s390_hash_table (info)->tls_ldm_got.refcount > 0)
elf_s390_hash_table (info)->tls_ldm_got.refcount -= 1;
break;
case R_390_GOTOFF16:
case R_390_GOTOFF32:
if (h != NULL && s390_is_ifunc_symbol_p (h) && h->def_regular)
{
h->plt.refcount--;
break;
}
case R_390_GOTPC:
case R_390_GOTPCDBL:
break;
case R_390_TLS_GD32:
case R_390_TLS_IE32:
case R_390_TLS_GOTIE12:
case R_390_TLS_GOTIE20:
case R_390_TLS_GOTIE32:
case R_390_TLS_IEENT:
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
if (h != NULL)
{
if (h->got.refcount > 0)
h->got.refcount -= 1;
}
else if (local_got_refcounts != NULL)
{
if (local_got_refcounts[r_symndx] > 0)
local_got_refcounts[r_symndx] -= 1;
}
break;
case R_390_8:
case R_390_12:
case R_390_16:
case R_390_20:
case R_390_32:
case R_390_PC16:
case R_390_PC12DBL:
case R_390_PC16DBL:
case R_390_PC24DBL:
case R_390_PC32DBL:
case R_390_PC32:
if (bfd_link_pic (info))
break;
/* Fall through. */
case R_390_PLT12DBL:
case R_390_PLT16DBL:
case R_390_PLT24DBL:
case R_390_PLT32DBL:
case R_390_PLT32:
case R_390_PLTOFF16:
case R_390_PLTOFF32:
if (h != NULL)
{
if (h->plt.refcount > 0)
h->plt.refcount -= 1;
}
break;
case R_390_GOTPLT12:
case R_390_GOTPLT16:
case R_390_GOTPLT20:
case R_390_GOTPLT32:
case R_390_GOTPLTENT:
if (h != NULL)
{
if (h->plt.refcount > 0)
{
((struct elf_s390_link_hash_entry *) h)->gotplt_refcount--;
h->plt.refcount -= 1;
}
}
else if (local_got_refcounts != NULL)
{
if (local_got_refcounts[r_symndx] > 0)
local_got_refcounts[r_symndx] -= 1;
}
break;
default:
break;
}
}
return TRUE;
}
/* Make sure we emit a GOT entry if the symbol was supposed to have a PLT
entry but we found we will not create any. Called when we find we will
not have any PLT for this symbol, by for example
elf_s390_adjust_dynamic_symbol when we're doing a proper dynamic link,
or elf_s390_size_dynamic_sections if no dynamic sections will be
created (we're only linking static objects). */
static void
elf_s390_adjust_gotplt (struct elf_s390_link_hash_entry *h)
{
if (h->elf.root.type == bfd_link_hash_warning)
h = (struct elf_s390_link_hash_entry *) h->elf.root.u.i.link;
if (h->gotplt_refcount <= 0)
return;
/* We simply add the number of gotplt references to the number
* of got references for this symbol. */
h->elf.got.refcount += h->gotplt_refcount;
h->gotplt_refcount = -1;
}
/* Adjust a symbol defined by a dynamic object and referenced by a
regular object. The current definition is in some section of the
dynamic object, but we're not including those sections. We have to
change the definition to something the rest of the link can
understand. */
static bfd_boolean
elf_s390_adjust_dynamic_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *h)
{
struct elf_s390_link_hash_table *htab;
asection *s;
/* STT_GNU_IFUNC symbol must go through PLT. */
if (s390_is_ifunc_symbol_p (h))
{
/* All local STT_GNU_IFUNC references must be treated as local
calls via local PLT. */
if (h->ref_regular && SYMBOL_CALLS_LOCAL (info, h))
{
bfd_size_type pc_count = 0, count = 0;
struct elf_dyn_relocs **pp;
struct elf_s390_link_hash_entry *eh;
struct elf_dyn_relocs *p;
eh = (struct elf_s390_link_hash_entry *) h;
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
{
pc_count += p->pc_count;
p->count -= p->pc_count;
p->pc_count = 0;
count += p->count;
if (p->count == 0)
*pp = p->next;
else
pp = &p->next;
}
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 (h->plt.refcount <= 0)
{
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
}
return TRUE;
}
/* If this is a function, put it in the procedure linkage table. We
will fill in the contents of the procedure linkage table later
(although we could actually do it here). */
if (h->type == STT_FUNC
|| h->needs_plt)
{
if (h->plt.refcount <= 0
|| SYMBOL_CALLS_LOCAL (info, h)
|| (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
&& h->root.type != bfd_link_hash_undefweak))
{
/* This case can occur if we saw a PLT32 reloc in an input
file, but the symbol was never referred to by a dynamic
object, or if all references were garbage collected. In
such a case, we don't actually need to build a procedure
linkage table, and we can just do a PC32 reloc instead. */
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
}
return TRUE;
}
else
/* It's possible that we incorrectly decided a .plt reloc was
needed for an R_390_PC32 reloc to a non-function sym in
check_relocs. We can't decide accurately between function and
non-function syms in check-relocs; Objects loaded later in
the link may change h->type. So fix it now. */
h->plt.offset = (bfd_vma) -1;
/* If this is a weak symbol, and there is a real definition, the
processor independent code will have arranged for us to see the
real definition first, and we can just use the same value. */
if (h->u.weakdef != NULL)
{
BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
|| h->u.weakdef->root.type == bfd_link_hash_defweak);
h->root.u.def.section = h->u.weakdef->root.u.def.section;
h->root.u.def.value = h->u.weakdef->root.u.def.value;
if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
h->non_got_ref = h->u.weakdef->non_got_ref;
return TRUE;
}
/* This is a reference to a symbol defined by a dynamic object which
is not a function. */
/* If we are creating a shared library, we must presume that the
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 (bfd_link_pic (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)
return TRUE;
/* If -z nocopyreloc was given, we won't generate them either. */
if (info->nocopyreloc)
{
h->non_got_ref = 0;
return TRUE;
}
if (ELIMINATE_COPY_RELOCS)
{
struct elf_s390_link_hash_entry * eh;
struct elf_dyn_relocs *p;
eh = (struct elf_s390_link_hash_entry *) h;
for (p = eh->dyn_relocs; p != NULL; p = p->next)
{
s = p->sec->output_section;
if (s != NULL && (s->flags & SEC_READONLY) != 0)
break;
}
/* If we didn't find any dynamic relocs in read-only sections, then
we'll be keeping the dynamic relocs and avoiding the copy reloc. */
if (p == NULL)
{
h->non_got_ref = 0;
return TRUE;
}
}
/* We must allocate the symbol in our .dynbss section, which will
become part of the .bss section of the executable. There will be
an entry for this symbol in the .dynsym section. The dynamic
object will contain position independent code, so all references
from the dynamic object to this symbol will go through the global
offset table. The dynamic linker will use the .dynsym entry to
determine the address it must put in the global offset table, so
both the dynamic object and the regular object will refer to the
same memory location for the variable. */
htab = elf_s390_hash_table (info);
/* We must generate a R_390_COPY reloc to tell the dynamic linker to
copy the initial value out of the dynamic object and into the
runtime process image. */
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
{
htab->srelbss->size += sizeof (Elf32_External_Rela);
h->needs_copy = 1;
}
s = htab->sdynbss;
return _bfd_elf_adjust_dynamic_copy (info, h, s);
}
/* Allocate space in .plt, .got and associated reloc sections for
dynamic relocs. */
static bfd_boolean
allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf)
{
struct bfd_link_info *info;
struct elf_s390_link_hash_table *htab;
struct elf_s390_link_hash_entry *eh = (struct elf_s390_link_hash_entry *)h;
struct elf_dyn_relocs *p;
if (h->root.type == bfd_link_hash_indirect)
return TRUE;
info = (struct bfd_link_info *) inf;
htab = elf_s390_hash_table (info);
/* 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 (s390_is_ifunc_symbol_p (h) && h->def_regular)
return s390_elf_allocate_ifunc_dyn_relocs (info, h);
else if (htab->elf.dynamic_sections_created
&& h->plt.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)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
if (bfd_link_pic (info)
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
{
asection *s = htab->elf.splt;
/* If this is the first .plt entry, make room for the special
first entry. */
if (s->size == 0)
s->size += PLT_FIRST_ENTRY_SIZE;
h->plt.offset = s->size;
/* If this symbol is not defined in a regular file, and we are
not generating a shared library, then set the symbol to this
location in the .plt. This is required to make function
pointers compare as equal between the normal executable and
the shared library. */
if (! bfd_link_pic (info)
&& !h->def_regular)
{
h->root.u.def.section = s;
h->root.u.def.value = h->plt.offset;
}
/* Make room for this entry. */
s->size += PLT_ENTRY_SIZE;
/* We also need to make an entry in the .got.plt section, which
will be placed in the .got section by the linker script. */
htab->elf.sgotplt->size += GOT_ENTRY_SIZE;
/* We also need to make an entry in the .rela.plt section. */
htab->elf.srelplt->size += sizeof (Elf32_External_Rela);
}
else
{
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
}
}
else
{
h->plt.offset = (bfd_vma) -1;
h->needs_plt = 0;
elf_s390_adjust_gotplt((struct elf_s390_link_hash_entry *) h);
}
/* If R_390_TLS_{IE32,GOTIE32,GOTIE12,IEENT} symbol is now local to
the binary, we can optimize a bit. IE32 and GOTIE32 get converted
to R_390_TLS_LE32 requiring no TLS entry. For GOTIE12 and IEENT
we can save the dynamic TLS relocation. */
if (h->got.refcount > 0
&& !bfd_link_pic (info)
&& h->dynindx == -1
&& elf_s390_hash_entry(h)->tls_type >= GOT_TLS_IE)
{
if (elf_s390_hash_entry(h)->tls_type == GOT_TLS_IE_NLT)
/* For the GOTIE access without a literal pool entry the offset has
to be stored somewhere. The immediate value in the instruction
is not bit enough so the value is stored in the got. */
{
h->got.offset = htab->elf.sgot->size;
htab->elf.sgot->size += GOT_ENTRY_SIZE;
}
else
h->got.offset = (bfd_vma) -1;
}
else if (h->got.refcount > 0)
{
asection *s;
bfd_boolean dyn;
int tls_type = elf_s390_hash_entry(h)->tls_type;
/* 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)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
s = htab->elf.sgot;
h->got.offset = s->size;
s->size += GOT_ENTRY_SIZE;
/* R_390_TLS_GD32 needs 2 consecutive GOT slots. */
if (tls_type == GOT_TLS_GD)
s->size += GOT_ENTRY_SIZE;
dyn = htab->elf.dynamic_sections_created;
/* R_390_TLS_IE32 needs one dynamic relocation,
R_390_TLS_GD32 needs one if local symbol and two if global. */
if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
|| tls_type >= GOT_TLS_IE)
htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
else if (tls_type == GOT_TLS_GD)
htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rela);
else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
|| h->root.type != bfd_link_hash_undefweak)
&& (bfd_link_pic (info)
|| WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
}
else
h->got.offset = (bfd_vma) -1;
if (eh->dyn_relocs == NULL)
return TRUE;
/* In the shared -Bsymbolic case, discard space allocated for
dynamic pc-relative relocs against symbols which turn out to be
defined in regular objects. For the normal shared case, discard
space for pc-relative relocs that have become local due to symbol
visibility changes. */
if (bfd_link_pic (info))
{
if (SYMBOL_CALLS_LOCAL (info, h))
{
struct elf_dyn_relocs **pp;
for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
{
p->count -= p->pc_count;
p->pc_count = 0;
if (p->count == 0)
*pp = p->next;
else
pp = &p->next;
}
}
/* Also discard relocs on undefined weak syms with non-default
visibility. */
if (eh->dyn_relocs != NULL
&& h->root.type == bfd_link_hash_undefweak)
{
if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
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)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
}
}
else if (ELIMINATE_COPY_RELOCS)
{
/* For the non-shared case, discard space for relocs against
symbols which turn out to need copy relocs or are not
dynamic. */
if (!h->non_got_ref
&& ((h->def_dynamic
&& !h->def_regular)
|| (htab->elf.dynamic_sections_created
&& (h->root.type == bfd_link_hash_undefweak
|| h->root.type == bfd_link_hash_undefined))))
{
/* 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)
{
if (! bfd_elf_link_record_dynamic_symbol (info, h))
return FALSE;
}
/* If that succeeded, we know we'll be keeping all the
relocs. */
if (h->dynindx != -1)
goto keep;
}
eh->dyn_relocs = NULL;
keep: ;
}
/* Finally, allocate space. */
for (p = eh->dyn_relocs; p != NULL; p = p->next)
{
asection *sreloc = elf_section_data (p->sec)->sreloc;
sreloc->size += p->count * sizeof (Elf32_External_Rela);
}
return TRUE;
}
/* Find any dynamic relocs that apply to read-only sections. */
static bfd_boolean
readonly_dynrelocs (struct elf_link_hash_entry *h, void * inf)
{
struct elf_s390_link_hash_entry *eh;
struct elf_dyn_relocs *p;
eh = (struct elf_s390_link_hash_entry *) h;
for (p = eh->dyn_relocs; p != NULL; p = p->next)
{
asection *s = p->sec->output_section;
if (s != NULL && (s->flags & SEC_READONLY) != 0)
{
struct bfd_link_info *info = (struct bfd_link_info *) inf;
info->flags |= DF_TEXTREL;
/* Not an error, just cut short the traversal. */
return FALSE;
}
}
return TRUE;
}
/* Set the sizes of the dynamic sections. */
static bfd_boolean
elf_s390_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info)
{
struct elf_s390_link_hash_table *htab;
bfd *dynobj;
asection *s;
bfd_boolean relocs;
bfd *ibfd;
htab = elf_s390_hash_table (info);
dynobj = htab->elf.dynobj;
if (dynobj == NULL)
abort ();
if (htab->elf.dynamic_sections_created)
{
/* Set the contents of the .interp section to the interpreter. */
if (bfd_link_executable (info) && !info->nointerp)
{
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)
{
bfd_signed_vma *local_got;
bfd_signed_vma *end_local_got;
char *local_tls_type;
bfd_size_type locsymcount;
Elf_Internal_Shdr *symtab_hdr;
asection *srela;
struct plt_entry *local_plt;
unsigned int i;
if (! is_s390_elf (ibfd))
continue;
for (s = ibfd->sections; s != NULL; s = s->next)
{
struct elf_dyn_relocs *p;
for (p = elf_section_data (s)->local_dynrel; p != NULL; p = p->next)
{
if (!bfd_is_abs_section (p->sec)
&& bfd_is_abs_section (p->sec->output_section))
{
/* Input section has been discarded, either because
it is a copy of a linkonce section or due to
linker script /DISCARD/, so we'll be discarding
the relocs too. */
}
else if (p->count != 0)
{
srela = elf_section_data (p->sec)->sreloc;
srela->size += p->count * sizeof (Elf32_External_Rela);
if ((p->sec->output_section->flags & SEC_READONLY) != 0)
info->flags |= DF_TEXTREL;
}
}
}
local_got = elf_local_got_refcounts (ibfd);
if (!local_got)
continue;
symtab_hdr = &elf_symtab_hdr (ibfd);
locsymcount = symtab_hdr->sh_info;
end_local_got = local_got + locsymcount;
local_tls_type = elf_s390_local_got_tls_type (ibfd);
s = htab->elf.sgot;
srela = htab->elf.srelgot;
for (; local_got < end_local_got; ++local_got, ++local_tls_type)
{
if (*local_got > 0)
{
*local_got = s->size;
s->size += GOT_ENTRY_SIZE;
if (*local_tls_type == GOT_TLS_GD)
s->size += GOT_ENTRY_SIZE;
if (bfd_link_pic (info))
srela->size += sizeof (Elf32_External_Rela);
}
else
*local_got = (bfd_vma) -1;
}
local_plt = elf_s390_local_plt (ibfd);
for (i = 0; i < symtab_hdr->sh_info; i++)
{
if (local_plt[i].plt.refcount > 0)
{
local_plt[i].plt.offset = htab->elf.iplt->size;
htab->elf.iplt->size += PLT_ENTRY_SIZE;
htab->elf.igotplt->size += GOT_ENTRY_SIZE;
htab->elf.irelplt->size += RELA_ENTRY_SIZE;
}
else
local_plt[i].plt.offset = (bfd_vma) -1;
}
}
if (htab->tls_ldm_got.refcount > 0)
{
/* Allocate 2 got entries and 1 dynamic reloc for R_390_TLS_LDM32
relocs. */
htab->tls_ldm_got.offset = htab->elf.sgot->size;
htab->elf.sgot->size += 2 * GOT_ENTRY_SIZE;
htab->elf.srelgot->size += sizeof (Elf32_External_Rela);
}
else
htab->tls_ldm_got.offset = -1;
/* Allocate global sym .plt and .got entries, and space for global
sym dynamic relocs. */
elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
/* We now have determined the sizes of the various dynamic sections.
Allocate memory for them. */
relocs = FALSE;
for (s = dynobj->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LINKER_CREATED) == 0)
continue;
if (s == htab->elf.splt
|| s == htab->elf.sgot
|| s == htab->elf.sgotplt
|| s == htab->sdynbss
|| s == htab->elf.iplt
|| s == htab->elf.igotplt
|| s == htab->irelifunc)
{
/* Strip this section if we don't need it; see the
comment below. */
}
else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela"))
{
if (s->size != 0)
relocs = TRUE;
/* We use the reloc_count field as a counter if we need
to copy relocs into the output file. */
s->reloc_count = 0;
}
else
{
/* It's not one of our sections, so don't allocate space. */
continue;
}
if (s->size == 0)
{
/* If we don't need this section, strip it from the
output file. This is to handle .rela.bss and
.rela.plt. We must create it in
create_dynamic_sections, because it must be created
before the linker maps input sections to output
sections. The linker does that before
adjust_dynamic_symbol is called, and it is that
function which decides whether anything needs to go
into these sections. */
s->flags |= SEC_EXCLUDE;
continue;
}
if ((s->flags & SEC_HAS_CONTENTS) == 0)
continue;
/* Allocate memory for the section contents. We use bfd_zalloc
here in case unused entries are not reclaimed before the
section's contents are written out. This should not happen,
but this way if it does, we get a R_390_NONE reloc instead
of garbage. */
s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
if (s->contents == NULL)
return FALSE;
}
if (htab->elf.dynamic_sections_created)
{
/* Add some entries to the .dynamic section. We fill in the
values later, in elf_s390_finish_dynamic_sections, but we
must add the entries now so that we get the correct size for
the .dynamic section. The DT_DEBUG entry is filled in by the
dynamic linker and used by the debugger. */
#define add_dynamic_entry(TAG, VAL) \
_bfd_elf_add_dynamic_entry (info, TAG, VAL)
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))
return FALSE;
}
if (relocs)
{
if (!add_dynamic_entry (DT_RELA, 0)
|| !add_dynamic_entry (DT_RELASZ, 0)
|| !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
return FALSE;
/* If any dynamic relocs apply to a read-only section,
then we need a DT_TEXTREL entry. */
if ((info->flags & DF_TEXTREL) == 0)
elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
if ((info->flags & DF_TEXTREL) != 0)
{
if (!add_dynamic_entry (DT_TEXTREL, 0))
return FALSE;
}
}
}
#undef add_dynamic_entry
return TRUE;
}
/* Return the base VMA address which should be subtracted from real addresses
when resolving @dtpoff relocation.
This is PT_TLS segment p_vaddr. */
static bfd_vma
dtpoff_base (struct bfd_link_info *info)
{
/* If tls_sec is NULL, we should have signalled an error already. */
if (elf_hash_table (info)->tls_sec == NULL)
return 0;
return elf_hash_table (info)->tls_sec->vma;
}
/* Return the relocation value for @tpoff relocation
if STT_TLS virtual address is ADDRESS. */
static bfd_vma
tpoff (struct bfd_link_info *info, bfd_vma address)
{
struct elf_link_hash_table *htab = elf_hash_table (info);
/* If tls_sec is NULL, we should have signalled an error already. */
if (htab->tls_sec == NULL)
return 0;
return htab->tls_size + htab->tls_sec->vma - address;
}
/* Complain if TLS instruction relocation is against an invalid
instruction. */
static void
invalid_tls_insn (bfd *input_bfd,
asection *input_section,
Elf_Internal_Rela *rel)
{
reloc_howto_type *howto;
howto = elf_howto_table + ELF32_R_TYPE (rel->r_info);
(*_bfd_error_handler)
(_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
input_bfd,
input_section,
(long) rel->r_offset,
howto->name);
bfd_set_error (bfd_error_bad_value);
}
/* Relocate a 390 ELF section. */
static bfd_boolean
elf_s390_relocate_section (bfd *output_bfd,
struct bfd_link_info *info,
bfd *input_bfd,
asection *input_section,
bfd_byte *contents,
Elf_Internal_Rela *relocs,
Elf_Internal_Sym *local_syms,
asection **local_sections)
{
struct elf_s390_link_hash_table *htab;
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
bfd_vma *local_got_offsets;
Elf_Internal_Rela *rel;
Elf_Internal_Rela *relend;
BFD_ASSERT (is_s390_elf (input_bfd));
htab = elf_s390_hash_table (info);
symtab_hdr = &elf_symtab_hdr (input_bfd);
sym_hashes = elf_sym_hashes (input_bfd);
local_got_offsets = elf_local_got_offsets (input_bfd);
rel = relocs;
relend = relocs + input_section->reloc_count;
for (; rel < relend; rel++)
{
unsigned int r_type;
reloc_howto_type *howto;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
asection *sec;
bfd_vma off;
bfd_vma relocation;
bfd_boolean unresolved_reloc;
bfd_reloc_status_type r;
int tls_type;
asection *base_got = htab->elf.sgot;
r_type = ELF32_R_TYPE (rel->r_info);
if (r_type == (int) R_390_GNU_VTINHERIT
|| r_type == (int) R_390_GNU_VTENTRY)
continue;
if (r_type >= (int) R_390_max)
{
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
howto = elf_howto_table + r_type;
r_symndx = ELF32_R_SYM (rel->r_info);
h = NULL;
sym = NULL;
sec = NULL;
unresolved_reloc = FALSE;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
{
struct plt_entry *local_plt = elf_s390_local_plt (input_bfd);
if (local_plt == NULL)
return FALSE;
/* Address of the PLT slot. */
relocation = (htab->elf.iplt->output_section->vma
+ htab->elf.iplt->output_offset
+ local_plt[r_symndx].plt.offset);
switch (r_type)
{
case R_390_PLTOFF16:
case R_390_PLTOFF32:
relocation -= htab->elf.sgot->output_section->vma;
break;
case R_390_GOTPLT12:
case R_390_GOTPLT16:
case R_390_GOTPLT20:
case R_390_GOTPLT32:
case R_390_GOTPLTENT:
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
{
/* Write the PLT slot address into the GOT slot. */
bfd_put_32 (output_bfd, relocation,
htab->elf.sgot->contents +
local_got_offsets[r_symndx]);
relocation = (local_got_offsets[r_symndx] +
htab->elf.sgot->output_offset);
if (r_type == R_390_GOTENT || r_type == R_390_GOTPLTENT)
relocation += htab->elf.sgot->output_section->vma;
break;
}
default:
break;
}
/* The output section is needed later in
finish_dynamic_section when creating the dynamic
relocation. */
local_plt[r_symndx].sec = sec;
goto do_relocation;
}
else
relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
}
else
{
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);
}
if (sec != NULL && discarded_section (sec))
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
rel, 1, relend, howto, 0, contents);
if (bfd_link_relocatable (info))
continue;
switch (r_type)
{
case R_390_GOTPLT12:
case R_390_GOTPLT16:
case R_390_GOTPLT20:
case R_390_GOTPLT32:
case R_390_GOTPLTENT:
/* There are three cases for a GOTPLT relocation. 1) The
relocation is against the jump slot entry of a plt that
will get emitted to the output file. 2) The relocation
is against the jump slot of a plt entry that has been
removed. elf_s390_adjust_gotplt has created a GOT entry
as replacement. 3) The relocation is against a local symbol.
Cases 2) and 3) are the same as the GOT relocation code
so we just have to test for case 1 and fall through for
the other two. */
if (h != NULL && h->plt.offset != (bfd_vma) -1)
{
bfd_vma plt_index;
if (s390_is_ifunc_symbol_p (h))
{
plt_index = h->plt.offset / PLT_ENTRY_SIZE;
relocation = (plt_index * GOT_ENTRY_SIZE +
htab->elf.igotplt->output_offset);
if (r_type == R_390_GOTPLTENT)
relocation += htab->elf.igotplt->output_section->vma;
}
else
{
/* Calc. index no.
Current offset - size first entry / entry size. */
plt_index = (h->plt.offset - PLT_FIRST_ENTRY_SIZE) /
PLT_ENTRY_SIZE;
/* Offset in GOT is PLT index plus GOT headers(3)
times 4, addr & GOT addr. */
relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
if (r_type == R_390_GOTPLTENT)
relocation += htab->elf.sgot->output_section->vma;
}
unresolved_reloc = FALSE;
}
/* Fall through. */
case R_390_GOT12:
case R_390_GOT16:
case R_390_GOT20:
case R_390_GOT32:
case R_390_GOTENT:
/* Relocation is to the entry for this symbol in the global
offset table. */
if (base_got == NULL)
abort ();
if (h != NULL)
{
bfd_boolean dyn;
off = h->got.offset;
dyn = htab->elf.dynamic_sections_created;
if (s390_is_ifunc_symbol_p (h))
{
BFD_ASSERT (h->plt.offset != (bfd_vma) -1);
if (off == (bfd_vma)-1)
{
/* No explicit GOT usage so redirect to the
got.iplt slot. */
base_got = htab->elf.igotplt;
off = h->plt.offset / PLT_ENTRY_SIZE * GOT_ENTRY_SIZE;
}
else
{
/* Explicit GOT slots must contain the address
of the PLT slot. This will be handled in
finish_dynamic_symbol. */
}
}
else 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))
{
/* This is actually a static link, or it is a
-Bsymbolic link and the symbol is defined
locally, or the symbol was forced to be local
because of a version file. We must initialize
this entry in the global offset table. Since the
offset must always be a multiple of 2, we use the
least significant bit to record whether we have
initialized it already.
When doing a dynamic link, we create a .rel.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_32 (output_bfd, relocation,
base_got->contents + off);
h->got.offset |= 1;
}
if ((h->def_regular
&& bfd_link_pic (info)
&& SYMBOL_REFERENCES_LOCAL (info, h))
/* lrl rx,sym@GOTENT -> larl rx, sym */
&& ((r_type == R_390_GOTENT
&& (bfd_get_16 (input_bfd,
contents + rel->r_offset - 2)
& 0xff0f) == 0xc40d)
/* ly rx, sym@GOT(r12) -> larl rx, sym */
|| (r_type == R_390_GOT20
&& (bfd_get_32 (input_bfd,
contents + rel->r_offset - 2)
& 0xff00f000) == 0xe300c000
&& bfd_get_8 (input_bfd,
contents + rel->r_offset + 3) == 0x58)))
{
unsigned short new_insn =
(0xc000 | (bfd_get_8 (input_bfd,
contents + rel->r_offset - 1) & 0xf0));
bfd_put_16 (output_bfd, new_insn,
contents + rel->r_offset - 2);
r_type = R_390_PC32DBL;
rel->r_addend = 2;
howto = elf_howto_table + r_type;
relocation = h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset;
goto do_relocation;
}
}
else
unresolved_reloc = FALSE;
}
else
{
if (local_got_offsets == NULL)
abort ();
off = local_got_offsets[r_symndx];
/* The offset must always be a multiple of 4. We use
the least significant bit to record whether we have
already generated the necessary reloc. */
if ((off & 1) != 0)
off &= ~1;
else
{
bfd_put_32 (output_bfd, relocation,
htab->elf.sgot->contents + off);
if (bfd_link_pic (info))
{
asection *srelgot;
Elf_Internal_Rela outrel;
bfd_byte *loc;
srelgot = htab->elf.srelgot;
if (srelgot == NULL)
abort ();
outrel.r_offset = (htab->elf.sgot->output_section->vma
+ htab->elf.sgot->output_offset
+ off);
outrel.r_info = ELF32_R_INFO (0, R_390_RELATIVE);
outrel.r_addend = relocation;
loc = srelgot->contents;
loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rela);
bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
}
local_got_offsets[r_symndx] |= 1;
}
}
if (off >= (bfd_vma) -2)
abort ();
relocation = base_got->output_offset + off;
/* For @GOTENT the relocation is against the offset between
the instruction and the symbols entry in the GOT and not
between the start of the GOT and the symbols entry. We
add the vma of the GOT to get the correct value. */
if ( r_type == R_390_GOTENT
|| r_type == R_390_GOTPLTENT)
relocation += base_got->output_section->vma;
break;
case R_390_GOTOFF16:
case R_390_GOTOFF32:
/* Relocation is relative to the start of the global offset
table. */
if (h != NULL
&& s390_is_ifunc_symbol_p (h)
&& h->def_regular
&& !bfd_link_executable (info))
{
relocation = (