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binutils-gdb/bfd/elf32-d10v.c

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/* D10V-specific support for 32-bit ELF
Copyright (C) 1996-2018 Free Software Foundation, Inc.
Contributed by Martin Hunt (hunt@cygnus.com).
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 "libbfd.h"
#include "elf-bfd.h"
#include "elf/d10v.h"
/* Use REL instead of RELA to save space. */
#define USE_REL 1
static reloc_howto_type elf_d10v_howto_table[] =
{
/* This reloc does nothing. */
HOWTO (R_D10V_NONE, /* Type. */
0, /* Rightshift. */
3, /* Size (0 = byte, 1 = short, 2 = long). */
0, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont,/* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_NONE", /* Name. */
FALSE, /* Partial_inplace. */
0, /* Src_mask. */
0, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* An PC Relative 10-bit relocation, shifted by 2, right container. */
HOWTO (R_D10V_10_PCREL_R, /* Type. */
2, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
8, /* Bitsize. */
TRUE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_signed, /* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_10_PCREL_R", /* Name. */
FALSE, /* Partial_inplace. */
0xff, /* Src_mask. */
0xff, /* Dst_mask. */
TRUE), /* PCrel_offset. */
/* An PC Relative 10-bit relocation, shifted by 2, left container. */
HOWTO (R_D10V_10_PCREL_L, /* Type. */
2, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
8, /* Bitsize. */
TRUE, /* PC_relative. */
15, /* Bitpos. */
complain_overflow_signed, /* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_10_PCREL_L", /* Name. */
FALSE, /* Partial_inplace. */
0x07f8000, /* Src_mask. */
0x07f8000, /* Dst_mask. */
TRUE), /* PCrel_offset. */
/* A 16 bit absolute relocation. */
HOWTO (R_D10V_16, /* Type. */
0, /* Rightshift. */
1, /* Size (0 = byte, 1 = short, 2 = long). */
16, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont,/* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_16", /* Name. */
FALSE, /* Partial_inplace. */
0xffff, /* Src_mask. */
0xffff, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* An 18 bit absolute relocation, right shifted 2. */
HOWTO (R_D10V_18, /* Type. */
2, /* Rightshift. */
1, /* Size (0 = byte, 1 = short, 2 = long). */
16, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont, /* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_18", /* Name. */
FALSE, /* Partial_inplace. */
0xffff, /* Src_mask. */
0xffff, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* A relative 18 bit relocation, right shifted by 2. */
HOWTO (R_D10V_18_PCREL, /* Type. */
2, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
16, /* Bitsize. */
TRUE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_signed, /* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_18_PCREL", /* Name. */
FALSE, /* Partial_inplace. */
0xffff, /* Src_mask. */
0xffff, /* Dst_mask. */
TRUE), /* PCrel_offset. */
/* A 32 bit absolute relocation. */
HOWTO (R_D10V_32, /* Type. */
0, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
32, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont,/* Complain_on_overflow. */
bfd_elf_generic_reloc, /* Special_function. */
"R_D10V_32", /* Name. */
FALSE, /* Partial_inplace. */
0xffffffff, /* Src_mask. */
0xffffffff, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* GNU extension to record C++ vtable hierarchy. */
HOWTO (R_D10V_GNU_VTINHERIT, /* Type. */
0, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
0, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont,/* Complain_on_overflow. */
NULL, /* Special_function. */
"R_D10V_GNU_VTINHERIT",/* Name. */
FALSE, /* Partial_inplace. */
0, /* Src_mask. */
0, /* Dst_mask. */
FALSE), /* PCrel_offset. */
/* GNU extension to record C++ vtable member usage. */
HOWTO (R_D10V_GNU_VTENTRY, /* Type. */
0, /* Rightshift. */
2, /* Size (0 = byte, 1 = short, 2 = long). */
0, /* Bitsize. */
FALSE, /* PC_relative. */
0, /* Bitpos. */
complain_overflow_dont,/* Complain_on_overflow. */
_bfd_elf_rel_vtable_reloc_fn, /* Special_function. */
"R_D10V_GNU_VTENTRY", /* Name. */
FALSE, /* Partial_inplace. */
0, /* Src_mask. */
0, /* Dst_mask. */
FALSE), /* PCrel_offset. */
};
/* Map BFD reloc types to D10V ELF reloc types. */
struct d10v_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct d10v_reloc_map d10v_reloc_map[] =
{
{ BFD_RELOC_NONE, R_D10V_NONE, },
{ BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },
{ BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },
{ BFD_RELOC_16, R_D10V_16 },
{ BFD_RELOC_D10V_18, R_D10V_18 },
{ BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },
{ BFD_RELOC_32, R_D10V_32 },
{ BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },
};
static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0;
i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);
i++)
if (d10v_reloc_map[i].bfd_reloc_val == code)
return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];
return NULL;
}
static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (elf_d10v_howto_table) / sizeof (elf_d10v_howto_table[0]);
i++)
if (elf_d10v_howto_table[i].name != NULL
&& strcasecmp (elf_d10v_howto_table[i].name, r_name) == 0)
return &elf_d10v_howto_table[i];
return NULL;
}
/* Set the howto pointer for an D10V ELF reloc. */
static void
d10v_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
if (r_type >= (unsigned int) R_D10V_max)
{
/* xgettext:c-format */
_bfd_error_handler (_("%B: invalid D10V reloc number: %d"), abfd, r_type);
r_type = 0;
}
cache_ptr->howto = &elf_d10v_howto_table[r_type];
}
static asection *
elf32_d10v_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_D10V_GNU_VTINHERIT:
case R_D10V_GNU_VTENTRY:
return NULL;
}
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
/* Look through the relocs for a section during the first phase.
Since we don't do .gots or .plts, we just need to consider the
virtual table relocs for gc. */
static bfd_boolean
elf32_d10v_check_relocs (bfd *abfd,
struct bfd_link_info *info,
asection *sec,
const Elf_Internal_Rela *relocs)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
if (bfd_link_relocatable (info))
return TRUE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
struct elf_link_hash_entry *h;
unsigned long r_symndx;
r_symndx = ELF32_R_SYM (rel->r_info);
if (r_symndx < symtab_hdr->sh_info)
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;
}
switch (ELF32_R_TYPE (rel->r_info))
{
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_D10V_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_D10V_GNU_VTENTRY:
BFD_ASSERT (h != NULL);
if (h != NULL
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
return FALSE;
break;
}
}
return TRUE;
}
static bfd_vma
extract_rel_addend (bfd *abfd,
bfd_byte *where,
reloc_howto_type *howto)
{
bfd_vma insn, val;
switch (howto->size)
{
case 0:
insn = bfd_get_8 (abfd, where);
break;
case 1:
insn = bfd_get_16 (abfd, where);
break;
case 2:
insn = bfd_get_32 (abfd, where);
break;
default:
abort ();
}
val = (insn & howto->dst_mask) >> howto->bitpos << howto->rightshift;
/* We should really be testing for signed addends here, but we don't
have that info directly in the howto. */
if (howto->pc_relative)
{
bfd_vma sign;
sign = howto->dst_mask & (~howto->dst_mask >> 1 | ~(-(bfd_vma) 1 >> 1));
sign = sign >> howto->bitpos << howto->rightshift;
val = (val ^ sign) - sign;
}
return val;
}
static void
insert_rel_addend (bfd *abfd,
bfd_byte *where,
reloc_howto_type *howto,
bfd_vma addend)
{
bfd_vma insn;
addend = (addend >> howto->rightshift << howto->bitpos) & howto->dst_mask;
insn = ~howto->dst_mask;
switch (howto->size)
{
case 0:
insn &= bfd_get_8 (abfd, where);
insn |= addend;
bfd_put_8 (abfd, insn, where);
break;
case 1:
insn &= bfd_get_16 (abfd, where);
insn |= addend;
bfd_put_16 (abfd, insn, where);
break;
case 2:
insn &= bfd_get_32 (abfd, where);
insn |= addend;
bfd_put_32 (abfd, insn, where);
break;
default:
abort ();
}
}
/* Relocate a D10V ELF section. */
static bfd_boolean
elf32_d10v_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)
{
Elf_Internal_Shdr *symtab_hdr;
struct elf_link_hash_entry **sym_hashes;
Elf_Internal_Rela *rel, *relend;
const char *name;
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
rel = relocs;
relend = relocs + input_section->reloc_count;
for (; rel < relend; rel++)
{
int r_type;
reloc_howto_type *howto;
unsigned long r_symndx;
Elf_Internal_Sym *sym;
asection *sec;
struct elf_link_hash_entry *h;
bfd_vma relocation;
bfd_reloc_status_type r;
r_symndx = ELF32_R_SYM (rel->r_info);
r_type = ELF32_R_TYPE (rel->r_info);
if (r_type == R_D10V_GNU_VTENTRY
|| r_type == R_D10V_GNU_VTINHERIT)
continue;
howto = elf_d10v_howto_table + r_type;
h = NULL;
sym = NULL;
sec = NULL;
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
sec = local_sections[r_symndx];
relocation = (sec->output_section->vma
+ sec->output_offset
+ sym->st_value);
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
&& ((sec->flags & SEC_MERGE) != 0
|| (bfd_link_relocatable (info)
&& sec->output_offset != 0)))
{
bfd_vma addend;
bfd_byte *where = contents + rel->r_offset;
addend = extract_rel_addend (input_bfd, where, howto);
if (bfd_link_relocatable (info))
addend += sec->output_offset;
else
{
asection *msec = sec;
addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
addend);
addend -= relocation;
addend += msec->output_section->vma + msec->output_offset;
}
insert_rel_addend (input_bfd, where, howto, addend);
}
}
else
{
bfd_boolean unresolved_reloc, warned, ignored;
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;
if (h != NULL)
name = h->root.root.string;
else
{
name = (bfd_elf_string_from_elf_section
(input_bfd, symtab_hdr->sh_link, sym->st_name));
if (name == NULL || *name == '\0')
name = bfd_section_name (input_bfd, sec);
}
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, (bfd_vma) 0);
if (r != bfd_reloc_ok)
{
const char * msg = (const char *) 0;
switch (r)
{
case bfd_reloc_overflow:
(*info->callbacks->reloc_overflow)
(info, (h ? &h->root : NULL), name, howto->name,
(bfd_vma) 0, input_bfd, input_section, rel->r_offset);
break;
case bfd_reloc_undefined:
(*info->callbacks->undefined_symbol)
(info, name, input_bfd, input_section, rel->r_offset, TRUE);
break;
case bfd_reloc_outofrange:
msg = _("internal error: out of range error");
goto common_error;
case bfd_reloc_notsupported:
msg = _("internal error: unsupported relocation error");
goto common_error;
case bfd_reloc_dangerous:
msg = _("internal error: dangerous error");
goto common_error;
default:
msg = _("internal error: unknown error");
/* fall through */
common_error:
(*info->callbacks->warning) (info, msg, name, input_bfd,
input_section, rel->r_offset);
break;
}
}
}
return TRUE;
}
#define ELF_ARCH bfd_arch_d10v
#define ELF_MACHINE_CODE EM_D10V
#define ELF_MACHINE_ALT1 EM_CYGNUS_D10V
#define ELF_MAXPAGESIZE 0x1000
#define TARGET_BIG_SYM d10v_elf32_vec
#define TARGET_BIG_NAME "elf32-d10v"
#define elf_info_to_howto 0
#define elf_info_to_howto_rel d10v_info_to_howto_rel
#define elf_backend_object_p 0
#define elf_backend_final_write_processing 0
#define elf_backend_gc_mark_hook elf32_d10v_gc_mark_hook
#define elf_backend_check_relocs elf32_d10v_check_relocs
#define elf_backend_relocate_section elf32_d10v_relocate_section
#define elf_backend_can_gc_sections 1
#include "elf32-target.h"
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