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binutils-gdb/bfd/elf32-h8300.c

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/* Generic support for 32-bit ELF
Copyright 1993, 1995, 1998, 1999 Free Software Foundation, Inc.
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/h8.h"
static reloc_howto_type *elf32_h8_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void elf32_h8_info_to_howto
PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
static void elf32_h8_info_to_howto_rel
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static int elf32_h8_mach
PARAMS ((flagword));
static bfd_reloc_status_type elf32_h8_final_link_relocate
PARAMS ((unsigned long, bfd *, bfd *, asection *,
bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
struct bfd_link_info *, asection *, int));
static boolean elf32_h8_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
bfd_byte *, Elf_Internal_Rela *,
Elf_Internal_Sym *, asection **));
/* This does not include any relocation information, but should be
good enough for GDB or objdump to read the file. */
static reloc_howto_type h8_elf_howto_table[] =
{
#define R_H8_NONE_X 0
HOWTO (R_H8_NONE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR32_X (R_H8_NONE_X + 1)
HOWTO (R_H8_DIR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR16_X (R_H8_DIR32_X + 1)
HOWTO (R_H8_DIR16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x0000ffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR8_X (R_H8_DIR16_X + 1)
HOWTO (R_H8_DIR8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x000000ff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
HOWTO (R_H8_DIR16A8, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR16A8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x0000ffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
HOWTO (R_H8_DIR16R8, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR16R8", /* name */
false, /* partial_inplace */
0, /* src_mask */
0x0000ffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
HOWTO (R_H8_DIR24A8, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR24A8", /* name */
true, /* partial_inplace */
0xff000000, /* src_mask */
0x00ffffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
HOWTO (R_H8_DIR24R8, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR24R8", /* name */
true, /* partial_inplace */
0xff000000, /* src_mask */
0x00ffffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
HOWTO (R_H8_DIR32A16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_DIR32", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
#define R_H8_PCREL16_X (R_H8_DIR32A16_X + 1)
HOWTO (R_H8_PCREL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_PCREL16", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
#define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
HOWTO (R_H8_PCREL8, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
NULL, /* special_function */
"R_H8_PCREL8", /* name */
false, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
};
/* This structure is used to map BFD reloc codes to H8 ELF relocs. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char howto_index;
};
/* An array mapping BFD reloc codes to SH ELF relocs. */
static const struct elf_reloc_map h8_reloc_map[] =
{
{ BFD_RELOC_NONE, R_H8_NONE_X },
{ BFD_RELOC_32, R_H8_DIR32_X },
{ BFD_RELOC_16, R_H8_DIR16_X },
{ BFD_RELOC_8, R_H8_DIR8_X },
{ BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
{ BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
{ BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
{ BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
{ BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
{ BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
{ BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
};
static reloc_howto_type *
elf32_h8_reloc_type_lookup (abfd, code)
bfd *abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
{
if (h8_reloc_map[i].bfd_reloc_val == code)
return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
}
return NULL;
}
static void
elf32_h8_info_to_howto (abfd, bfd_reloc, elf_reloc)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *bfd_reloc;
Elf32_Internal_Rela *elf_reloc;
{
unsigned int r;
unsigned int i;
r = ELF32_R_TYPE (elf_reloc->r_info);
for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
if (h8_elf_howto_table[i].type== r)
{
bfd_reloc->howto = &h8_elf_howto_table[i];
return;
}
abort ();
}
static void
elf32_h8_info_to_howto_rel (abfd, bfd_reloc, elf_reloc)
bfd *abfd ATTRIBUTE_UNUSED;
arelent *bfd_reloc;
Elf32_Internal_Rel *elf_reloc ATTRIBUTE_UNUSED;
{
unsigned int r;
abort ();
r = ELF32_R_TYPE (elf_reloc->r_info);
bfd_reloc->howto = &h8_elf_howto_table[r];
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
input_section, contents, offset, value,
addend, info, sym_sec, is_local)
unsigned long r_type;
bfd *input_bfd;
bfd *output_bfd ATTRIBUTE_UNUSED;
asection *input_section ATTRIBUTE_UNUSED;
bfd_byte *contents;
bfd_vma offset;
bfd_vma value;
bfd_vma addend;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
asection *sym_sec ATTRIBUTE_UNUSED;
int is_local ATTRIBUTE_UNUSED;
{
bfd_byte *hit_data = contents + offset;
switch (r_type)
{
case R_H8_NONE:
return bfd_reloc_ok;
case R_H8_DIR32:
case R_H8_DIR32A16:
value += addend;
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_H8_DIR16:
case R_H8_DIR16A8:
case R_H8_DIR16R8:
value += addend;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
/* AKA R_RELBYTE */
case R_H8_DIR8:
value += addend;
bfd_put_8 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_H8_DIR24A8:
case R_H8_DIR24R8:
value += addend;
value &= 0xffffff;
value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_H8_PCREL16:
value -= (input_section->output_section->vma
+ input_section->output_offset);
value -= offset;
value += addend;
bfd_put_16 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_H8_PCREL8:
value -= (input_section->output_section->vma
+ input_section->output_offset);
value -= offset;
value += addend;
bfd_put_8 (input_bfd, value, hit_data);
return bfd_reloc_ok;
default:
return bfd_reloc_notsupported;
}
}
/* Relocate an H8 ELF section. */
static boolean
elf32_h8_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, local_syms, local_sections)
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;
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;
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 (info->relocateable)
{
/* This is a relocateable link. We don't have to change
anything, unless the reloc is against a section symbol,
in which case we have to adjust according to where the
section symbol winds up in the output section. */
if (r_symndx < symtab_hdr->sh_info)
{
sym = local_syms + r_symndx;
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
sec = local_sections[r_symndx];
rel->r_addend += sec->output_offset + sym->st_value;
}
}
continue;
}
/* This is a final link. */
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);
}
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;
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
sec = h->root.u.def.section;
relocation = (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset);
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
else
{
if (! ((*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd,
input_section, rel->r_offset, true)))
return false;
relocation = 0;
}
}
r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
input_section,
contents, rel->r_offset,
relocation, rel->r_addend,
info, sec, h == NULL);
if (r != bfd_reloc_ok)
{
const char *name;
const char *msg = (const char *) 0;
arelent bfd_reloc;
reloc_howto_type *howto;
elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
howto = bfd_reloc.howto;
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);
}
switch (r)
{
case bfd_reloc_overflow:
if (! ((*info->callbacks->reloc_overflow)
(info, name, howto->name, (bfd_vma) 0,
input_bfd, input_section, rel->r_offset)))
return false;
break;
case bfd_reloc_undefined:
if (! ((*info->callbacks->undefined_symbol)
(info, name, input_bfd, input_section,
rel->r_offset, true)))
return false;
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:
if (!((*info->callbacks->warning)
(info, msg, name, input_bfd, input_section,
rel->r_offset)))
return false;
break;
}
}
}
return true;
}
/* Object files encode the specific H8 model they were compiled
for in the ELF flags field.
Examine that field and return the proper BFD machine type for
the object file. */
static int
elf32_h8_mach (flags)
flagword flags;
{
switch (flags & EF_H8_MACH)
{
case E_H8_MACH_H8300:
default:
return bfd_mach_h8300;
case E_H8_MACH_H8300H:
return bfd_mach_h8300h;
case E_H8_MACH_H8300S:
return bfd_mach_h8300s;
}
}
/* The final processing done just before writing out a H8 ELF object
file. We use this opportunity to encode the BFD machine type
into the flags field in the object file. */
void
elf32_h8_final_write_processing (abfd, linker)
bfd *abfd;
boolean linker ATTRIBUTE_UNUSED;
{
unsigned long val;
switch (bfd_get_mach (abfd))
{
default:
case bfd_mach_h8300:
val = E_H8_MACH_H8300;
break;
case bfd_mach_h8300h:
val = E_H8_MACH_H8300H;
break;
case bfd_mach_h8300s:
val = E_H8_MACH_H8300S;
break;
}
elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
elf_elfheader (abfd)->e_flags |= val;
}
/* Return nonzero if ABFD represents a valid H8 ELF object file; also
record the encoded machine type found in the ELF flags. */
boolean
elf32_h8_object_p (abfd)
bfd *abfd;
{
bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
elf32_h8_mach (elf_elfheader (abfd)->e_flags));
return true;
}
/* Merge backend specific data from an object file to the output
object file when linking. The only data we need to copy at this
time is the architecture/machine information. */
boolean
elf32_h8_merge_private_bfd_data (ibfd, obfd)
bfd *ibfd;
bfd *obfd;
{
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
return true;
if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
&& bfd_get_mach (obfd) < bfd_get_mach (ibfd))
{
if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
bfd_get_mach (ibfd)))
return false;
}
return true;
}
#define TARGET_BIG_SYM bfd_elf32_h8300_vec
#define TARGET_BIG_NAME "elf32-h8300"
#define ELF_ARCH bfd_arch_h8300
#define ELF_MACHINE_CODE EM_H8_300
#define ELF_MAXPAGESIZE 0x1
#define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
#define elf_info_to_howto elf32_h8_info_to_howto
#define elf_info_to_howto_rel elf32_h8_info_to_howto_rel
/* So we can set/examine bits in e_flags to get the specific
H8 architecture in use. */
#define elf_backend_final_write_processing \
elf32_h8_final_write_processing
#define elf_backend_object_p \
elf32_h8_object_p
#define bfd_elf32_bfd_merge_private_bfd_data \
elf32_h8_merge_private_bfd_data
/* ??? when elf_backend_relocate_section is not defined, elf32-target.h
defaults to using _bfd_generic_link_hash_table_create, but
elflink.h:bfd_elf32_size_dynamic_sections uses
dynobj = elf_hash_table (info)->dynobj;
and thus requires an elf hash table. */
#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create
/* Use an H8 specific linker, not the ELF generic linker. */
#define elf_backend_relocate_section elf32_h8_relocate_section
#include "elf32-target.h"
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