/* BFD back-end for National Semiconductor's CR16 ELF
Copyright 2007 Free Software Foundation, Inc.
Written by M R Swami Reddy.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "libiberty.h"
#include "elf-bfd.h"
#include "elf/cr16.h"
/* cr16_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
struct cr16_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
unsigned short cr16_reloc_type; /* CR16 relocation type. */
};
static const struct cr16_reloc_map cr16_reloc_map[R_CR16_MAX] =
{
{BFD_RELOC_NONE, R_CR16_NONE},
{BFD_RELOC_CR16_NUM8, R_CR16_NUM8},
{BFD_RELOC_CR16_NUM16, R_CR16_NUM16},
{BFD_RELOC_CR16_NUM32, R_CR16_NUM32},
{BFD_RELOC_CR16_NUM32a, R_CR16_NUM32a},
{BFD_RELOC_CR16_REGREL4, R_CR16_REGREL4},
{BFD_RELOC_CR16_REGREL4a, R_CR16_REGREL4a},
{BFD_RELOC_CR16_REGREL14, R_CR16_REGREL14},
{BFD_RELOC_CR16_REGREL14a, R_CR16_REGREL14a},
{BFD_RELOC_CR16_REGREL16, R_CR16_REGREL16},
{BFD_RELOC_CR16_REGREL20, R_CR16_REGREL20},
{BFD_RELOC_CR16_REGREL20a, R_CR16_REGREL20a},
{BFD_RELOC_CR16_ABS20, R_CR16_ABS20},
{BFD_RELOC_CR16_ABS24, R_CR16_ABS24},
{BFD_RELOC_CR16_IMM4, R_CR16_IMM4},
{BFD_RELOC_CR16_IMM8, R_CR16_IMM8},
{BFD_RELOC_CR16_IMM16, R_CR16_IMM16},
{BFD_RELOC_CR16_IMM20, R_CR16_IMM20},
{BFD_RELOC_CR16_IMM24, R_CR16_IMM24},
{BFD_RELOC_CR16_IMM32, R_CR16_IMM32},
{BFD_RELOC_CR16_IMM32a, R_CR16_IMM32a},
{BFD_RELOC_CR16_DISP4, R_CR16_DISP4},
{BFD_RELOC_CR16_DISP8, R_CR16_DISP8},
{BFD_RELOC_CR16_DISP16, R_CR16_DISP16},
{BFD_RELOC_CR16_DISP24, R_CR16_DISP24},
{BFD_RELOC_CR16_DISP24a, R_CR16_DISP24a}
};
static reloc_howto_type cr16_elf_howto_table[] =
{
HOWTO (R_CR16_NONE, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NONE", /* name */
FALSE, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_NUM8, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM8", /* name */
FALSE, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_NUM16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_NUM32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_NUM32a, /* type */
1, /* rightshift */
2, /* size */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_NUM32a", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL4, /* type */
0, /* rightshift */
0, /* size */
4, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL4", /* name */
FALSE, /* partial_inplace */
0xf, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL4a, /* type */
0, /* rightshift */
0, /* size */
4, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL4a", /* name */
FALSE, /* partial_inplace */
0xf, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL14, /* type */
0, /* rightshift */
1, /* size */
14, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL14", /* name */
FALSE, /* partial_inplace */
0x3fff, /* src_mask */
0x3fff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL14a, /* type */
0, /* rightshift */
1, /* size */
14, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL14a", /* name */
FALSE, /* partial_inplace */
0x3fff, /* src_mask */
0x3fff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL20, /* type */
0, /* rightshift */
2, /* size */
20, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL20", /* name */
FALSE, /* partial_inplace */
0xfffff, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_REGREL20a, /* type */
0, /* rightshift */
2, /* size */
20, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_REGREL20a", /* name */
FALSE, /* partial_inplace */
0xfffff, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_ABS20, /* type */
0, /* rightshift */
2, /* size */
20, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_ABS20", /* name */
FALSE, /* partial_inplace */
0xfffff, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_ABS24, /* type */
0, /* rightshift */
2, /* size */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_ABS24", /* name */
FALSE, /* partial_inplace */
0xffffff, /* src_mask */
0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM4, /* type */
0, /* rightshift */
0, /* size */
4, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM4", /* name */
FALSE, /* partial_inplace */
0xf, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM8, /* type */
0, /* rightshift */
0, /* size */
8, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM8", /* name */
FALSE, /* partial_inplace */
0xff, /* src_mask */
0xff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM16, /* type */
0, /* rightshift */
1, /* size */
16, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM20, /* type */
0, /* rightshift */
2, /* size */
20, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM20", /* name */
FALSE, /* partial_inplace */
0xfffff, /* src_mask */
0xfffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM24, /* type */
0, /* rightshift */
2, /* size */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM24", /* name */
FALSE, /* partial_inplace */
0xffffff, /* src_mask */
0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM32, /* type */
0, /* rightshift */
2, /* size */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM32", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_IMM32a, /* type */
1, /* rightshift */
2, /* size */
32, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_IMM32a", /* name */
FALSE, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_DISP4, /* type */
1, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
4, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP4", /* name */
FALSE, /* partial_inplace */
0xf, /* src_mask */
0xf, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_DISP8, /* type */
1, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP8", /* name */
FALSE, /* partial_inplace */
0x1ff, /* src_mask */
0x1ff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_DISP16, /* type */
0, /* rightshift REVIITS: To sync with WinIDEA*/
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP16", /* name */
FALSE, /* partial_inplace */
0x1ffff, /* src_mask */
0x1ffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* REVISIT: DISP24 should be left-shift by 2 as per ISA doc
but its not done, to sync with WinIDEA and CR16 4.1 tools */
HOWTO (R_CR16_DISP24, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP24", /* name */
FALSE, /* partial_inplace */
0x1ffffff, /* src_mask */
0x1ffffff, /* dst_mask */
FALSE), /* pcrel_offset */
HOWTO (R_CR16_DISP24a, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
TRUE, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CR16_DISP24a", /* name */
FALSE, /* partial_inplace */
0xffffff, /* src_mask */
0xffffff, /* dst_mask */
FALSE) /* pcrel_offset */
};
/* Retrieve a howto ptr using a BFD reloc_code. */
static reloc_howto_type *
elf_cr16_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < R_CR16_MAX; i++)
if (code == cr16_reloc_map[i].bfd_reloc_enum)
return &cr16_elf_howto_table[cr16_reloc_map[i].cr16_reloc_type];
_bfd_error_handler ("Unsupported CR16 relocation type: 0x%x\n", code);
return NULL;
}
static reloc_howto_type *
elf_cr16_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0; ARRAY_SIZE (cr16_elf_howto_table); i++)
if (cr16_elf_howto_table[i].name != NULL
&& strcasecmp (cr16_elf_howto_table[i].name, r_name) == 0)
return cr16_elf_howto_table + i;
return NULL;
}
/* Retrieve a howto ptr using an internal relocation entry. */
static void
elf_cr16_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_CR16_MAX);
cache_ptr->howto = &cr16_elf_howto_table[r_type];
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
cr16_elf_final_link_relocate (reloc_howto_type *howto,
bfd *input_bfd,
bfd *output_bfd ATTRIBUTE_UNUSED,
asection *input_section,
bfd_byte *contents,
bfd_vma offset,
bfd_vma Rvalue,
bfd_vma addend,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sec ATTRIBUTE_UNUSED,
int is_local ATTRIBUTE_UNUSED)
{
unsigned short r_type = howto->type;
bfd_byte *hit_data = contents + offset;
bfd_vma reloc_bits, check, Rvalue1;
switch (r_type)
{
case R_CR16_IMM4:
case R_CR16_IMM8:
case R_CR16_IMM16:
case R_CR16_IMM20:
case R_CR16_IMM32:
case R_CR16_IMM32a:
case R_CR16_REGREL4:
case R_CR16_REGREL4a:
case R_CR16_REGREL14:
case R_CR16_REGREL14a:
case R_CR16_REGREL16:
case R_CR16_REGREL20:
case R_CR16_ABS20:
case R_CR16_ABS24:
case R_CR16_DISP16:
case R_CR16_DISP24:
/* 'hit_data' is relative to the start of the instruction, not the
relocation offset. Advance it to account for the exact offset. */
hit_data += 2;
break;
case R_CR16_NONE:
return bfd_reloc_ok;
break;
case R_CR16_DISP4:
case R_CR16_DISP8:
case R_CR16_DISP24a:
/* We only care about the addend, where the difference between
expressions is kept. */
if (is_local) Rvalue -= -1;
default:
break;
}
if (howto->pc_relative)
{
/* Subtract the address of the section containing the location. */
Rvalue -= (input_section->output_section->vma
+ input_section->output_offset);
/* Subtract the position of the location within the section. */
Rvalue -= offset;
}
/* Add in supplied addend. */
Rvalue += addend;
/* Complain if the bitfield overflows, whether it is considered
as signed or unsigned. */
check = Rvalue >> howto->rightshift;
/* Assumes two's complement. This expression avoids
overflow if howto->bitsize is the number of bits in
bfd_vma. */
reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;
if (((bfd_vma) check & ~reloc_bits) != 0
&& (((bfd_vma) check & ~reloc_bits)
!= (-(bfd_vma) 1 & ~reloc_bits)))
{
/* The above right shift is incorrect for a signed
value. See if turning on the upper bits fixes the
overflow. */
if (howto->rightshift && (bfd_signed_vma) Rvalue < 0)
{
check |= ((bfd_vma) - 1
& ~((bfd_vma) - 1
>> howto->rightshift));
if (((bfd_vma) check & ~reloc_bits)
!= (-(bfd_vma) 1 & ~reloc_bits))
return bfd_reloc_overflow;
}
else
return bfd_reloc_overflow;
}
/* Drop unwanted bits from the value we are relocating to. */
Rvalue >>= (bfd_vma) howto->rightshift;
/* Apply dst_mask to select only relocatable part of the insn. */
Rvalue &= howto->dst_mask;
switch (howto->size)
{
case 0:
if ((r_type == R_CR16_IMM4)
|| (r_type == R_CR16_DISP4)
|| (r_type == R_CR16_DISP8))
{
Rvalue1 = bfd_get_16 (input_bfd, hit_data);
Rvalue = ((Rvalue1 & 0xf000) | ((Rvalue << 4) & 0xf00)
| (Rvalue1 & 0x00f0) | (Rvalue & 0xf));
bfd_put_16 (input_bfd, Rvalue, hit_data);
}
break;
case 1:
if (r_type == R_CR16_DISP16)
{
Rvalue |= (bfd_get_16 (input_bfd, hit_data));
Rvalue = ((Rvalue & 0xfffe) | ((Rvalue >> 16) & 0x1));
bfd_put_16 (input_bfd, Rvalue, hit_data);
}
break;
case 2:
if (r_type == R_CR16_ABS20)
{
Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16)
| (bfd_get_16 (input_bfd, hit_data + 2)))
& ~howto->dst_mask);
Rvalue |= (bfd_get_16 (input_bfd, hit_data + 2) << 16);
/* Relocation on INSTRUCTIONS is different : Instructions are
word-addressable, that is, each word itself is arranged according
to little-endian convention, whereas the words are arranged with
respect to one another in BIG ENDIAN fashion.
When there is an immediate value that spans a word boundary,
it is split in a big-endian way with respect to the words. */
bfd_put_16 (input_bfd, (Rvalue) & 0xffff, hit_data);
bfd_put_16 (input_bfd, (Rvalue >> 16)& 0xffff, hit_data + 2);
}
else if (r_type == R_CR16_ABS24)
{
Rvalue = ((((Rvalue >> 20)& 0xf)
| (((Rvalue >> 16) & 0xf) << 8)
| (bfd_get_16 (input_bfd, hit_data)))
| ((Rvalue & 0xffff) << 16));
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
else if (r_type == R_CR16_DISP24)
{
Rvalue = ((((Rvalue >> 20)& 0xf) | (((Rvalue >> 16) & 0xf)<<8)
| (bfd_get_16 (input_bfd, hit_data)))
| (((Rvalue & 0xfffE) | ((Rvalue >> 24) & 0x1)) << 16));
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
else if ((r_type == R_CR16_IMM32) || (r_type == R_CR16_IMM32a))
{
Rvalue = (((Rvalue >> 16)& 0xffff)
| (bfd_get_16 (input_bfd, hit_data)))
| ((Rvalue & 0xffff) << 16);
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
else if (r_type == R_CR16_DISP24a)
{
Rvalue = (((Rvalue & 0xfffffe) | (Rvalue >> 23)));
Rvalue = ((Rvalue >> 16) & 0xff) | ((Rvalue & 0xffff) << 16)
| (bfd_get_32 (input_bfd, hit_data));
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
else if ((r_type == R_CR16_NUM32) || (r_type == R_CR16_NUM32a))
{
bfd_put_32 (input_bfd, Rvalue, hit_data);
}
break;
default:
return bfd_reloc_notsupported;
}
return bfd_reloc_ok;
}
/* Delete some bytes from a section while relaxing. */
static bfd_boolean
elf32_cr16_relax_delete_bytes (struct bfd_link_info *link_info, bfd *abfd,
asection *sec, bfd_vma addr, int count)
{
Elf_Internal_Shdr *symtab_hdr;
unsigned int sec_shndx;
bfd_byte *contents;
Elf_Internal_Rela *irel, *irelend;
Elf_Internal_Rela *irelalign;
bfd_vma toaddr;
Elf_Internal_Sym *isym;
Elf_Internal_Sym *isymend;
struct elf_link_hash_entry **sym_hashes;
struct elf_link_hash_entry **end_hashes;
struct elf_link_hash_entry **start_hashes;
unsigned int symcount;
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
contents = elf_section_data (sec)->this_hdr.contents;
/* The deletion must stop at the next ALIGN reloc for an aligment
power larger than the number of bytes we are deleting. */
irelalign = NULL;
toaddr = sec->size;
irel = elf_section_data (sec)->relocs;
irelend = irel + sec->reloc_count;
/* Actually delete the bytes. */
memmove (contents + addr, contents + addr + count,
(size_t) (toaddr - addr - count));
sec->size -= count;
/* Adjust all the relocs. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
/* Get the new reloc address. */
if ((irel->r_offset > addr && irel->r_offset < toaddr))
irel->r_offset -= count;
/* Adjust the local symbols defined in this section. */
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
isym = (Elf_Internal_Sym *) symtab_hdr->contents;
for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
{
if (isym->st_shndx == sec_shndx
&& isym->st_value > addr
&& isym->st_value < toaddr)
{
/* Adjust the addend of SWITCH relocations in this section,
which reference this local symbol. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
{
unsigned long r_symndx;
Elf_Internal_Sym *rsym;
bfd_vma addsym, subsym;
r_symndx = ELF32_R_SYM (irel->r_info);
rsym = (Elf_Internal_Sym *) symtab_hdr->contents + r_symndx;
/* Skip if not the local adjusted symbol. */
if (rsym != isym)
continue;
addsym = isym->st_value;
subsym = addsym - irel->r_addend;
/* Fix the addend only when -->> (addsym > addr >= subsym). */
if (subsym <= addr)
irel->r_addend -= count;
else
continue;
}
isym->st_value -= count;
}
}
/* Now adjust the global symbols defined in this section. */
symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
- symtab_hdr->sh_info);
sym_hashes = start_hashes = elf_sym_hashes (abfd);
end_hashes = sym_hashes + symcount;
for (; sym_hashes < end_hashes; sym_hashes++)
{
struct elf_link_hash_entry *sym_hash = *sym_hashes;
/* The '--wrap SYMBOL' option is causing a pain when the object file,
containing the definition of __wrap_SYMBOL, includes a direct
call to SYMBOL as well. Since both __wrap_SYMBOL and SYMBOL reference
the same symbol (which is __wrap_SYMBOL), but still exist as two
different symbols in 'sym_hashes', we don't want to adjust
the global symbol __wrap_SYMBOL twice.
This check is only relevant when symbols are being wrapped. */
if (link_info->wrap_hash != NULL)
{
struct elf_link_hash_entry **cur_sym_hashes;
/* Loop only over the symbols whom been already checked. */
for (cur_sym_hashes = start_hashes; cur_sym_hashes < sym_hashes;
cur_sym_hashes++)
/* If the current symbol is identical to 'sym_hash', that means
the symbol was already adjusted (or at least checked). */
if (*cur_sym_hashes == sym_hash)
break;
/* Don't adjust the symbol again. */
if (cur_sym_hashes < sym_hashes)
continue;
}
if ((sym_hash->root.type == bfd_link_hash_defined
|| sym_hash->root.type == bfd_link_hash_defweak)
&& sym_hash->root.u.def.section == sec
&& sym_hash->root.u.def.value > addr
&& sym_hash->root.u.def.value < toaddr)
sym_hash->root.u.def.value -= count;
}
return TRUE;
}
/* Relocate a CR16 ELF section. */
static bfd_boolean
elf32_cr16_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;
if (info->relocatable)
return TRUE;
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);
howto = cr16_elf_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 = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
}
else
{
bfd_boolean unresolved_reloc, warned;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes,
h, sec, relocation,
unresolved_reloc, warned);
}
r = cr16_elf_final_link_relocate (howto, 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 = NULL;
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, (h ? &h->root : NULL), 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;
}
/* This is a version of bfd_generic_get_relocated_section_contents
which uses elf32_cr16_relocate_section. */
static bfd_byte *
elf32_cr16_get_relocated_section_contents (bfd *output_bfd,
struct bfd_link_info *link_info,
struct bfd_link_order *link_order,
bfd_byte *data,
bfd_boolean relocatable,
asymbol **symbols)
{
Elf_Internal_Shdr *symtab_hdr;
asection *input_section = link_order->u.indirect.section;
bfd *input_bfd = input_section->owner;
asection **sections = NULL;
Elf_Internal_Rela *internal_relocs = NULL;
Elf_Internal_Sym *isymbuf = NULL;
/* We only need to handle the case of relaxing, or of having a
particular set of section contents, specially. */
if (relocatable
|| elf_section_data (input_section)->this_hdr.contents == NULL)
return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
link_order, data,
relocatable,
symbols);
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
memcpy (data, elf_section_data (input_section)->this_hdr.contents,
(size_t) input_section->size);
if ((input_section->flags & SEC_RELOC) != 0
&& input_section->reloc_count > 0)
{
Elf_Internal_Sym *isym;
Elf_Internal_Sym *isymend;
asection **secpp;
bfd_size_type amt;
internal_relocs = _bfd_elf_link_read_relocs (input_bfd, input_section,
NULL, NULL, FALSE);
if (internal_relocs == NULL)
goto error_return;
if (symtab_hdr->sh_info != 0)
{
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
if (isymbuf == NULL)
isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
symtab_hdr->sh_info, 0,
NULL, NULL, NULL);
if (isymbuf == NULL)
goto error_return;
}
amt = symtab_hdr->sh_info;
amt *= sizeof (asection *);
sections = bfd_malloc (amt);
if (sections == NULL && amt != 0)
goto error_return;
isymend = isymbuf + symtab_hdr->sh_info;
for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
{
asection *isec;
if (isym->st_shndx == SHN_UNDEF)
isec = bfd_und_section_ptr;
else if (isym->st_shndx == SHN_ABS)
isec = bfd_abs_section_ptr;
else if (isym->st_shndx == SHN_COMMON)
isec = bfd_com_section_ptr;
else
isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
*secpp = isec;
}
if (! elf32_cr16_relocate_section (output_bfd, link_info, input_bfd,
input_section, data, internal_relocs,
isymbuf, sections))
goto error_return;
if (sections != NULL)
free (sections);
if (isymbuf != NULL
&& symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
}
return data;
error_return:
if (sections != NULL)
free (sections);
if (isymbuf != NULL
&& symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (internal_relocs != NULL
&& elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
return NULL;
}
/* This function handles relaxing for the CR16.
There's quite a few relaxing opportunites available on the CR16:
* bcond:24 -> bcond:16 2 bytes
* bcond:16 -> bcond:8 2 bytes
* arithmetic imm32 -> arithmetic imm16 2 bytes
Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
static bfd_boolean
elf32_cr16_relax_section (bfd *abfd, asection *sec,
struct bfd_link_info *link_info, bfd_boolean *again)
{
Elf_Internal_Shdr *symtab_hdr;
Elf_Internal_Rela *internal_relocs;
Elf_Internal_Rela *irel, *irelend;
bfd_byte *contents = NULL;
Elf_Internal_Sym *isymbuf = NULL;
/* Assume nothing changes. */
*again = FALSE;
/* We don't have to do anything for a relocatable link, if
this section does not have relocs, or if this is not a
code section. */
if (link_info->relocatable
|| (sec->flags & SEC_RELOC) == 0
|| sec->reloc_count == 0
|| (sec->flags & SEC_CODE) == 0)
return TRUE;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
/* Get a copy of the native relocations. */
internal_relocs = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
link_info->keep_memory);
if (internal_relocs == NULL)
goto error_return;
/* Walk through them looking for relaxing opportunities. */
irelend = internal_relocs + sec->reloc_count;
for (irel = internal_relocs; irel < irelend; irel++)
{
bfd_vma symval;
/* If this isn't something that can be relaxed, then ignore
this reloc. */
if (ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP16
&& ELF32_R_TYPE (irel->r_info) != (int) R_CR16_DISP24)
continue;
/* Get the section contents if we haven't done so already. */
if (contents == NULL)
{
/* Get cached copy if it exists. */
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
/* Go get them off disk. */
else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
goto error_return;
}
/* Read this BFD's local symbols if we haven't done so already. */
if (isymbuf == NULL && symtab_hdr->sh_info != 0)
{
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
if (isymbuf == NULL)
isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
symtab_hdr->sh_info, 0,
NULL, NULL, NULL);
if (isymbuf == NULL)
goto error_return;
}
/* Get the value of the symbol referred to by the reloc. */
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
{
/* A local symbol. */
Elf_Internal_Sym *isym;
asection *sym_sec;
isym = isymbuf + ELF32_R_SYM (irel->r_info);
if (isym->st_shndx == SHN_UNDEF)
sym_sec = bfd_und_section_ptr;
else if (isym->st_shndx == SHN_ABS)
sym_sec = bfd_abs_section_ptr;
else if (isym->st_shndx == SHN_COMMON)
sym_sec = bfd_com_section_ptr;
else
sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
symval = (isym->st_value
+ sym_sec->output_section->vma
+ sym_sec->output_offset);
}
else
{
unsigned long indx;
struct elf_link_hash_entry *h;
/* An external symbol. */
indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
h = elf_sym_hashes (abfd)[indx];
BFD_ASSERT (h != NULL);
if (h->root.type != bfd_link_hash_defined
&& h->root.type != bfd_link_hash_defweak)
/* This appears to be a reference to an undefined
symbol. Just ignore it--it will be caught by the
regular reloc processing. */
continue;
symval = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
}
/* For simplicity of coding, we are going to modify the section
contents, the section relocs, and the BFD symbol table. We
must tell the rest of the code not to free up this
information. It would be possible to instead create a table
of changes which have to be made, as is done in coff-mips.c;
that would be more work, but would require less memory when
the linker is run. */
/* Try to turn a 24 branch/call into a 16bit relative
* branch/call. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP24)
{
bfd_vma value = symval;
/* Deal with pc-relative gunk. */
value -= (sec->output_section->vma + sec->output_offset);
value -= irel->r_offset;
value += irel->r_addend;
/* See if the value will fit in 16 bits, note the high value is
0xfffe + 2 as the target will be two bytes closer if we are
able to relax. */
if ((long) value < 0x10000 && (long) value > -0x10002)
{
unsigned int code;
/* Get the opcode. */
code = (unsigned int) bfd_get_32 (abfd, contents + irel->r_offset);
/* Verify it's a 'bcond' and fix the opcode. */
if ((code & 0xffff) == 0x0010)
{
bfd_put_16 (abfd, 0x1800 | ((0xf & (code >>20))<<4), contents + irel->r_offset);
bfd_put_16 (abfd, value, contents + irel->r_offset+2);
}
else
continue;
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
elf_section_data (sec)->this_hdr.contents = contents;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_CR16_DISP16);
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
Note that this is not required, and it may be slow. */
*again = TRUE;
}
}
/* Try to turn a 16bit pc-relative branch into an
8bit pc-relative branch. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_DISP16)
{
bfd_vma value = symval;
/* Deal with pc-relative gunk. */
value -= (sec->output_section->vma + sec->output_offset);
value -= irel->r_offset;
value += irel->r_addend;
/* See if the value will fit in 8 bits, note the high value is
0xfc + 2 as the target will be two bytes closer if we are
able to relax. */
if ((long) value < 0xfe && (long) value > -0x100)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Verify it's a 'bcond' opcode. */
if ((code & 0xff00) == 0x1800)
{
bfd_put_8 (abfd, 0x1 | ((0xf & (code>>4))<<4), contents + irel->r_offset);
bfd_put_8 (abfd, value, contents + irel->r_offset+2);
}
else
continue;
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
elf_section_data (sec)->this_hdr.contents = contents;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_CR16_DISP8);
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
Note that this is not required, and it may be slow. */
*again = TRUE;
}
}
#if 0 // REVISIT: To support IMM relaxation in CR16 target
/* Try to turn a 32bit immediate address into
a 20bit immediate address. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM32)
{
bfd_vma value = symval;
/* See if the value will fit in 20 bits. */
if ((long) value < 0x7ffff && (long) value > -0x80000)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Verify it's a 'arithmetic double'. */
if ((code & 0xfff0) != 0x0070)
continue;
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
elf_section_data (sec)->this_hdr.contents = contents;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the opcode. */
bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_CR16_IMM20);
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
Note that this is not required, and it may be slow. */
*again = TRUE;
}
}
/* Try to turn a 20bit/16bit immediate address into
a 4bit immediate address. */
if ((ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM20)
|| (ELF32_R_TYPE (irel->r_info) == (int) R_CR16_IMM16))
{
bfd_vma value = symval;
/* See if the value will fit in 4 bits. */
if ((long) value < 0x7 && (long) value > -0x8)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_8 (abfd, contents + irel->r_offset);
/* Verify it's a 'arithmetic double'. */
if (((code & 0xff) != 0x50) || ((code & 0xff) != 0x45))
continue;
/* Note that we've changed the relocs, section contents, etc. */
elf_section_data (sec)->relocs = internal_relocs;
elf_section_data (sec)->this_hdr.contents = contents;
symtab_hdr->contents = (unsigned char *) isymbuf;
/* Fix the opcode. */
bfd_put_8 (abfd, (code & 0xff) - 0x10, contents + irel->r_offset);
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_CR16_IMM4);
/* Delete two bytes of data. */
if (!elf32_cr16_relax_delete_bytes (link_info, abfd, sec,
irel->r_offset + 2, 2))
goto error_return;
/* That will change things, so, we should relax again.
Note that this is not required, and it may be slow. */
*again = TRUE;
}
}
#endif
}
if (isymbuf != NULL
&& symtab_hdr->contents != (unsigned char *) isymbuf)
{
if (! link_info->keep_memory)
free (isymbuf);
else
{
/* Cache the symbols for elf_link_input_bfd. */
symtab_hdr->contents = (unsigned char *) isymbuf;
}
}
if (contents != NULL
&& elf_section_data (sec)->this_hdr.contents != contents)
{
if (! link_info->keep_memory)
free (contents);
else
{
/* Cache the section contents for elf_link_input_bfd. */
elf_section_data (sec)->this_hdr.contents = contents;
}
}
if (internal_relocs != NULL
&& elf_section_data (sec)->relocs != internal_relocs)
free (internal_relocs);
return TRUE;
error_return:
if (isymbuf != NULL
&& symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (contents != NULL
&& elf_section_data (sec)->this_hdr.contents != contents)
free (contents);
if (internal_relocs != NULL
&& elf_section_data (sec)->relocs != internal_relocs)
free (internal_relocs);
return FALSE;
}
static asection *
elf32_cr16_gc_mark_hook (asection *sec,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
struct elf_link_hash_entry *h,
Elf_Internal_Sym *sym)
{
if (h == NULL)
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
switch (h->root.type)
{
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
return h->root.u.def.section;
case bfd_link_hash_common:
return h->root.u.c.p->section;
default:
return NULL;
}
}
/* Update the got entry reference counts for the section being removed. */
static bfd_boolean
elf32_cr16_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
asection *sec ATTRIBUTE_UNUSED,
const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED)
{
/* We don't support garbage collection of GOT and PLT relocs yet. */
return TRUE;
}
/* Definitions for setting CR16 target vector. */
#define TARGET_LITTLE_SYM bfd_elf32_cr16_vec
#define TARGET_LITTLE_NAME "elf32-cr16"
#define ELF_ARCH bfd_arch_cr16
#define ELF_MACHINE_CODE EM_CR16
#define ELF_MAXPAGESIZE 0x1
#define elf_symbol_leading_char '_'
#define bfd_elf32_bfd_reloc_type_lookup elf_cr16_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup elf_cr16_reloc_name_lookup
#define elf_info_to_howto elf_cr16_info_to_howto
#define elf_info_to_howto_rel 0
#define elf_backend_relocate_section elf32_cr16_relocate_section
#define bfd_elf32_bfd_relax_section elf32_cr16_relax_section
#define bfd_elf32_bfd_get_relocated_section_contents \
elf32_cr16_get_relocated_section_contents
#define elf_backend_gc_mark_hook elf32_cr16_gc_mark_hook
#define elf_backend_gc_sweep_hook elf32_cr16_gc_sweep_hook
#define elf_backend_can_gc_sections 1
#define elf_backend_rela_normal 1
#include "elf32-target.h"