elf32-sparc.c 11.1 KB
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/* SPARC-specific support for 32-bit ELF
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   Copyright (C) 1993-2016 Free Software Foundation, Inc.
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   This file is part of BFD, the Binary File Descriptor library.
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   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
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   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.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/sparc.h"
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#include "opcode/sparc.h"
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#include "elfxx-sparc.h"
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#include "elf-vxworks.h"
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/* Support for core dump NOTE sections.  */
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static bfd_boolean
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elf32_sparc_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
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{
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  switch (note->descsz)
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    {
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    default:
      return FALSE;
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    case 260:			/* Solaris prpsinfo_t.  */
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      elf_tdata (abfd)->core->program
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	= _bfd_elfcore_strndup (abfd, note->descdata + 84, 16);
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      elf_tdata (abfd)->core->command
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	= _bfd_elfcore_strndup (abfd, note->descdata + 100, 80);
      break;
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    case 336:			/* Solaris psinfo_t.  */
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      elf_tdata (abfd)->core->program
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	= _bfd_elfcore_strndup (abfd, note->descdata + 88, 16);
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      elf_tdata (abfd)->core->command
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	= _bfd_elfcore_strndup (abfd, note->descdata + 104, 80);
      break;
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    }

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  return TRUE;
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}

/* Functions for dealing with the e_flags field.

   We don't define set_private_flags or copy_private_bfd_data because
   the only currently defined values are based on the bfd mach number,
   so we use the latter instead and defer setting e_flags until the
   file is written out.  */

/* Merge backend specific data from an object file to the output
   object file when linking.  */

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static bfd_boolean
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elf32_sparc_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
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{
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  bfd_boolean error;
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  unsigned long ibfd_mach;
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  /* FIXME: This should not be static.  */
  static unsigned long previous_ibfd_e_flags = (unsigned long) -1;
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  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
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    return TRUE;
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  error = FALSE;
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  ibfd_mach = bfd_get_mach (ibfd);
  if (bfd_mach_sparc_64bit_p (ibfd_mach))
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    {
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      error = TRUE;
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      (*_bfd_error_handler)
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	(_("%B: compiled for a 64 bit system and target is 32 bit"), ibfd);
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    }
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  else if ((ibfd->flags & DYNAMIC) == 0)
    {
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      if (bfd_get_mach (obfd) < ibfd_mach)
	bfd_set_arch_mach (obfd, bfd_arch_sparc, ibfd_mach);
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    }
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  if (((elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA)
       != previous_ibfd_e_flags)
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      && previous_ibfd_e_flags != (unsigned long) -1)
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    {
      (*_bfd_error_handler)
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	(_("%B: linking little endian files with big endian files"), ibfd);
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      error = TRUE;
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    }
  previous_ibfd_e_flags = elf_elfheader (ibfd)->e_flags & EF_SPARC_LEDATA;

  if (error)
    {
      bfd_set_error (bfd_error_bad_value);
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      return FALSE;
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    }

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  return _bfd_sparc_elf_merge_private_bfd_data (ibfd, obfd);
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}

/* The final processing done just before writing out the object file.
   We need to set the e_machine field appropriately.  */

static void
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elf32_sparc_final_write_processing (bfd *abfd,
				    bfd_boolean linker ATTRIBUTE_UNUSED)
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{
  switch (bfd_get_mach (abfd))
    {
    case bfd_mach_sparc :
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    case bfd_mach_sparc_sparclet :
    case bfd_mach_sparc_sparclite :
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      break; /* nothing to do */
    case bfd_mach_sparc_v8plus :
      elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
      elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
      elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS;
      break;
    case bfd_mach_sparc_v8plusa :
      elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
      elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
      elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1;
      break;
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    case bfd_mach_sparc_v8plusb :
      elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
      elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
      elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
				       | EF_SPARC_SUN_US3;
      break;
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    case bfd_mach_sparc_sparclite_le :
      elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
      break;
    default :
      abort ();
      break;
    }
}
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static enum elf_reloc_type_class
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elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
			      const asection *rel_sec ATTRIBUTE_UNUSED,
			      const Elf_Internal_Rela *rela)
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{
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  switch ((int) ELF32_R_TYPE (rela->r_info))
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    {
    case R_SPARC_RELATIVE:
      return reloc_class_relative;
    case R_SPARC_JMP_SLOT:
      return reloc_class_plt;
    case R_SPARC_COPY:
      return reloc_class_copy;
    default:
      return reloc_class_normal;
    }
}
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/* Hook called by the linker routine which adds symbols from an object
   file.  */

static bfd_boolean
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elf32_sparc_add_symbol_hook (bfd * abfd,
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			     struct bfd_link_info * info,
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			     Elf_Internal_Sym * sym,
			     const char ** namep ATTRIBUTE_UNUSED,
			     flagword * flagsp ATTRIBUTE_UNUSED,
			     asection ** secp ATTRIBUTE_UNUSED,
			     bfd_vma * valp ATTRIBUTE_UNUSED)
{
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  if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
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      && (abfd->flags & DYNAMIC) == 0
      && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
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    elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
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  return TRUE;
}

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#define TARGET_BIG_SYM	sparc_elf32_vec
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#define TARGET_BIG_NAME	"elf32-sparc"
#define ELF_ARCH	bfd_arch_sparc
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#define ELF_TARGET_ID	SPARC_ELF_DATA
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#define ELF_MACHINE_CODE EM_SPARC
#define ELF_MACHINE_ALT1 EM_SPARC32PLUS
#define ELF_MAXPAGESIZE 0x10000
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#define ELF_COMMONPAGESIZE 0x2000
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#define bfd_elf32_bfd_merge_private_bfd_data \
					elf32_sparc_merge_private_bfd_data
#define elf_backend_final_write_processing \
					elf32_sparc_final_write_processing
#define elf_backend_grok_psinfo		elf32_sparc_grok_psinfo
#define elf_backend_reloc_type_class	elf32_sparc_reloc_type_class

#define elf_info_to_howto		_bfd_sparc_elf_info_to_howto
#define bfd_elf32_bfd_reloc_type_lookup	_bfd_sparc_elf_reloc_type_lookup
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#define bfd_elf32_bfd_reloc_name_lookup \
  _bfd_sparc_elf_reloc_name_lookup
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#define bfd_elf32_bfd_link_hash_table_create \
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					_bfd_sparc_elf_link_hash_table_create
#define bfd_elf32_bfd_relax_section	_bfd_sparc_elf_relax_section
#define bfd_elf32_new_section_hook	_bfd_sparc_elf_new_section_hook
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#define elf_backend_copy_indirect_symbol \
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					_bfd_sparc_elf_copy_indirect_symbol
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#define elf_backend_create_dynamic_sections \
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					_bfd_sparc_elf_create_dynamic_sections
#define elf_backend_check_relocs	_bfd_sparc_elf_check_relocs
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#define elf_backend_adjust_dynamic_symbol \
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					_bfd_sparc_elf_adjust_dynamic_symbol
#define elf_backend_omit_section_dynsym	_bfd_sparc_elf_omit_section_dynsym
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#define elf_backend_size_dynamic_sections \
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					_bfd_sparc_elf_size_dynamic_sections
#define elf_backend_relocate_section	_bfd_sparc_elf_relocate_section
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#define elf_backend_finish_dynamic_symbol \
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					_bfd_sparc_elf_finish_dynamic_symbol
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#define elf_backend_finish_dynamic_sections \
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					_bfd_sparc_elf_finish_dynamic_sections
#define bfd_elf32_mkobject		_bfd_sparc_elf_mkobject
#define elf_backend_object_p		_bfd_sparc_elf_object_p
#define elf_backend_gc_mark_hook	_bfd_sparc_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook       _bfd_sparc_elf_gc_sweep_hook
#define elf_backend_plt_sym_val		_bfd_sparc_elf_plt_sym_val
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#define elf_backend_init_index_section	_bfd_elf_init_1_index_section
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#define elf_backend_can_gc_sections 1
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#define elf_backend_can_refcount 1
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#define elf_backend_want_got_plt 0
#define elf_backend_plt_readonly 0
#define elf_backend_want_plt_sym 1
#define elf_backend_got_header_size 4
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#define elf_backend_rela_normal 1
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#define elf_backend_add_symbol_hook		elf32_sparc_add_symbol_hook

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#include "elf32-target.h"
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/* Solaris 2.  */

#undef	TARGET_BIG_SYM
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#define	TARGET_BIG_SYM				sparc_elf32_sol2_vec
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#undef	TARGET_BIG_NAME
#define	TARGET_BIG_NAME				"elf32-sparc-sol2"

#undef elf32_bed
#define elf32_bed				elf32_sparc_sol2_bed

/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
   boundary.  */
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#undef  elf_backend_static_tls_alignment
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#define elf_backend_static_tls_alignment	8

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#undef  elf_backend_strtab_flags
#define elf_backend_strtab_flags	SHF_STRINGS

static bfd_boolean
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elf32_sparc_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)
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{
  /* PR 19938: FIXME: Need to add code for setting the sh_info
     and sh_link fields of Solaris specific section types.  */
  return FALSE;
}

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#undef  elf_backend_copy_special_section_fields
#define elf_backend_copy_special_section_fields elf32_sparc_copy_solaris_special_section_fields
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#include "elf32-target.h"

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/* A wrapper around _bfd_sparc_elf_link_hash_table_create that identifies
   the target system as VxWorks.  */

static struct bfd_link_hash_table *
elf32_sparc_vxworks_link_hash_table_create (bfd *abfd)
{
  struct bfd_link_hash_table *ret;

  ret = _bfd_sparc_elf_link_hash_table_create (abfd);
  if (ret)
    {
      struct _bfd_sparc_elf_link_hash_table *htab;

      htab = (struct _bfd_sparc_elf_link_hash_table *) ret;
      htab->is_vxworks = 1;
    }
  return ret;
}

/* A final_write_processing hook that does both the SPARC- and VxWorks-
   specific handling.  */

static void
elf32_sparc_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker)
{
  elf32_sparc_final_write_processing (abfd, linker);
  elf_vxworks_final_write_processing (abfd, linker);
}

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#undef  TARGET_BIG_SYM
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#define TARGET_BIG_SYM	sparc_elf32_vxworks_vec
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#undef  TARGET_BIG_NAME
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#define TARGET_BIG_NAME	"elf32-sparc-vxworks"

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#undef  ELF_MINPAGESIZE
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#define ELF_MINPAGESIZE	0x1000

#undef bfd_elf32_bfd_link_hash_table_create
#define bfd_elf32_bfd_link_hash_table_create \
  elf32_sparc_vxworks_link_hash_table_create

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#undef  elf_backend_want_got_plt
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#define elf_backend_want_got_plt		1
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#undef  elf_backend_plt_readonly
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#define elf_backend_plt_readonly		1
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#undef  elf_backend_got_header_size
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#define elf_backend_got_header_size		12
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#undef  elf_backend_add_symbol_hook
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#define elf_backend_add_symbol_hook \
  elf_vxworks_add_symbol_hook
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#undef  elf_backend_link_output_symbol_hook
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#define elf_backend_link_output_symbol_hook \
  elf_vxworks_link_output_symbol_hook
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#undef  elf_backend_emit_relocs
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#define elf_backend_emit_relocs \
  elf_vxworks_emit_relocs
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#undef  elf_backend_final_write_processing
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#define elf_backend_final_write_processing \
  elf32_sparc_vxworks_final_write_processing
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#undef  elf_backend_static_tls_alignment
#undef  elf_backend_strtab_flags
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#undef  elf_backend_copy_special_section_fields
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#undef  elf32_bed
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#define elf32_bed				sparc_elf_vxworks_bed

#include "elf32-target.h"