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binutils-gdb/bfd/elf32-pj.c

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/* picoJava specific support for 32-bit ELF
Copyright (C) 1999-2016 Free Software Foundation, Inc.
Contributed by Steve Chamberlan of Transmeta (sac@pobox.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 "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/pj.h"
/* This function is used for normal relocs. This is like the COFF
function, and is almost certainly incorrect for other ELF targets. */
static bfd_reloc_status_type
pj_elf_reloc (bfd *abfd,
arelent *reloc_entry,
asymbol *symbol_in,
void * data,
asection *input_section,
bfd *output_bfd,
char **error_message ATTRIBUTE_UNUSED)
{
unsigned long insn;
bfd_vma sym_value;
enum elf_pj_reloc_type r_type;
bfd_vma addr = reloc_entry->address;
bfd_byte *hit_data = addr + (bfd_byte *) data;
r_type = (enum elf_pj_reloc_type) reloc_entry->howto->type;
if (output_bfd != NULL)
{
/* Partial linking--do nothing. */
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (symbol_in != NULL
&& bfd_is_und_section (symbol_in->section))
return bfd_reloc_undefined;
if (bfd_is_com_section (symbol_in->section))
sym_value = 0;
else
sym_value = (symbol_in->value +
symbol_in->section->output_section->vma +
symbol_in->section->output_offset);
switch (r_type)
{
case R_PJ_DATA_DIR32:
insn = bfd_get_32 (abfd, hit_data);
insn += sym_value + reloc_entry->addend;
bfd_put_32 (abfd, (bfd_vma) insn, hit_data);
break;
/* Relocations in code are always bigendian, no matter what the
data endianness is. */
case R_PJ_CODE_DIR32:
insn = bfd_getb32 (hit_data);
insn += sym_value + reloc_entry->addend;
bfd_putb32 ((bfd_vma) insn, hit_data);
break;
case R_PJ_CODE_REL16:
insn = bfd_getb16 (hit_data);
insn += sym_value + reloc_entry->addend
- (input_section->output_section->vma
+ input_section->output_offset);
bfd_putb16 ((bfd_vma) insn, hit_data);
break;
case R_PJ_CODE_LO16:
insn = bfd_getb16 (hit_data);
insn += sym_value + reloc_entry->addend;
bfd_putb16 ((bfd_vma) insn, hit_data);
break;
case R_PJ_CODE_HI16:
insn = bfd_getb16 (hit_data);
insn += (sym_value + reloc_entry->addend) >> 16;
bfd_putb16 ((bfd_vma) insn, hit_data);
break;
default:
abort ();
break;
}
return bfd_reloc_ok;
}
static reloc_howto_type pj_elf_howto_table[] =
{
/* No relocation. */
HOWTO (R_PJ_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 */
pj_elf_reloc, /* special_function */
"R_PJ_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
/* 32 bit absolute relocation. Setting partial_inplace to TRUE and
src_mask to a non-zero value is similar to the COFF toolchain. */
HOWTO (R_PJ_DATA_DIR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
pj_elf_reloc, /* special_function */
"R_PJ_DIR32", /* name */
TRUE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* 32 bit PC relative relocation. */
HOWTO (R_PJ_CODE_REL32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
pj_elf_reloc, /* special_function */
"R_PJ_REL32", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0xffffffff, /* dst_mask */
TRUE), /* pcrel_offset */
/* 16 bit PC relative relocation. */
HOWTO (R_PJ_CODE_REL16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overf6w */
pj_elf_reloc, /* special_function */
"R_PJ_REL16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE), /* pcrel_offset */
EMPTY_HOWTO (4),
EMPTY_HOWTO (5),
HOWTO (R_PJ_CODE_DIR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
pj_elf_reloc, /* special_function */
"R_PJ_CODE_DIR32", /* name */
TRUE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
EMPTY_HOWTO (7),
EMPTY_HOWTO (8),
EMPTY_HOWTO (9),
EMPTY_HOWTO (10),
EMPTY_HOWTO (11),
EMPTY_HOWTO (12),
HOWTO (R_PJ_CODE_LO16, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
pj_elf_reloc, /* special_function */
"R_PJ_LO16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE), /* pcrel_offset */
HOWTO (R_PJ_CODE_HI16, /* type */
16, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
pj_elf_reloc, /* special_function */
"R_PJ_HI16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
TRUE), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy. */
HOWTO (R_PJ_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_PJ_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_PJ_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_PJ_GNU_VTENTRY", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
};
/* This structure is used to map BFD reloc codes to PJ ELF relocs. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
/* An array mapping BFD reloc codes to PJ ELF relocs. */
static const struct elf_reloc_map pj_reloc_map[] =
{
{ BFD_RELOC_NONE, R_PJ_NONE },
{ BFD_RELOC_32, R_PJ_DATA_DIR32 },
{ BFD_RELOC_PJ_CODE_DIR16, R_PJ_CODE_DIR16 },
{ BFD_RELOC_PJ_CODE_DIR32, R_PJ_CODE_DIR32 },
{ BFD_RELOC_PJ_CODE_LO16, R_PJ_CODE_LO16 },
{ BFD_RELOC_PJ_CODE_HI16, R_PJ_CODE_HI16 },
{ BFD_RELOC_PJ_CODE_REL32, R_PJ_CODE_REL32 },
{ BFD_RELOC_PJ_CODE_REL16, R_PJ_CODE_REL16 },
{ BFD_RELOC_VTABLE_INHERIT, R_PJ_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_PJ_GNU_VTENTRY },
};
/* Given a BFD reloc code, return the howto structure for the
corresponding PJ ELf reloc. */
static reloc_howto_type *
pj_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < sizeof (pj_reloc_map) / sizeof (struct elf_reloc_map); i++)
if (pj_reloc_map[i].bfd_reloc_val == code)
return & pj_elf_howto_table[(int) pj_reloc_map[i].elf_reloc_val];
return NULL;
}
static reloc_howto_type *
pj_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (pj_elf_howto_table) / sizeof (pj_elf_howto_table[0]);
i++)
if (pj_elf_howto_table[i].name != NULL
&& strcasecmp (pj_elf_howto_table[i].name, r_name) == 0)
return &pj_elf_howto_table[i];
return NULL;
}
/* Given an ELF reloc, fill in the howto field of a relent. */
static void
pj_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r;
r = ELF32_R_TYPE (dst->r_info);
if (r >= R_PJ_max)
{
(*_bfd_error_handler) (_("%B: unrecognised PicoJava reloc number: %d"),
abfd, r);
bfd_set_error (bfd_error_bad_value);
r = R_PJ_NONE;
}
cache_ptr->howto = &pj_elf_howto_table[r];
}
/* Take this moment to fill in the special picoJava bits in the
e_flags field. */
static void
pj_elf_final_write_processing (bfd *abfd,
bfd_boolean linker ATTRIBUTE_UNUSED)
{
elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_ARCH;
elf_elfheader (abfd)->e_flags |= EF_PICOJAVA_GNUCALLS;
}
#define TARGET_BIG_SYM pj_elf32_vec
#define TARGET_BIG_NAME "elf32-pj"
#define TARGET_LITTLE_SYM pj_elf32_le_vec
#define TARGET_LITTLE_NAME "elf32-pjl"
#define ELF_ARCH bfd_arch_pj
#define ELF_MACHINE_CODE EM_PJ
#define ELF_MACHINE_ALT1 EM_PJ_OLD
#define ELF_MAXPAGESIZE 0x1000
#define bfd_elf32_bfd_get_relocated_section_contents \
bfd_generic_get_relocated_section_contents
#define bfd_elf32_bfd_reloc_type_lookup pj_elf_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup pj_elf_reloc_name_lookup
#define elf_backend_final_write_processing pj_elf_final_write_processing
#define elf_info_to_howto pj_elf_info_to_howto
#include "elf32-target.h"
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