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Projet_SETI_RISC-V/riscv-gnu-toolchain/binutils/bfd/elf32-crx.c

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projet
2023-03-06 14:48:14 +01:00
/* BFD back-end for National Semiconductor's CRX ELF
Copyright (C) 2004-2022 Free Software Foundation, Inc.
Written by Tomer Levi, NSC, Israel.
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/crx.h"
static reloc_howto_type *elf_crx_reloc_type_lookup
(bfd *, bfd_reloc_code_real_type);
static bool elf_crx_info_to_howto
(bfd *, arelent *, Elf_Internal_Rela *);
static bool elf32_crx_relax_delete_bytes
(struct bfd_link_info *, bfd *, asection *, bfd_vma, int);
static bfd_reloc_status_type crx_elf_final_link_relocate
(reloc_howto_type *, bfd *, bfd *, asection *,
bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
struct bfd_link_info *, asection *, int);
static int elf32_crx_relocate_section
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
static bool elf32_crx_relax_section
(bfd *, asection *, struct bfd_link_info *, bool *);
static bfd_byte * elf32_crx_get_relocated_section_contents
(bfd *, struct bfd_link_info *, struct bfd_link_order *,
bfd_byte *, bool, asymbol **);
/* crx_reloc_map array maps BFD relocation enum into a CRGAS relocation type. */
struct crx_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_enum; /* BFD relocation enum. */
unsigned short crx_reloc_type; /* CRX relocation type. */
};
static const struct crx_reloc_map crx_reloc_map[R_CRX_MAX] =
{
{BFD_RELOC_NONE, R_CRX_NONE},
{BFD_RELOC_CRX_REL4, R_CRX_REL4},
{BFD_RELOC_CRX_REL8, R_CRX_REL8},
{BFD_RELOC_CRX_REL8_CMP, R_CRX_REL8_CMP},
{BFD_RELOC_CRX_REL16, R_CRX_REL16},
{BFD_RELOC_CRX_REL24, R_CRX_REL24},
{BFD_RELOC_CRX_REL32, R_CRX_REL32},
{BFD_RELOC_CRX_REGREL12, R_CRX_REGREL12},
{BFD_RELOC_CRX_REGREL22, R_CRX_REGREL22},
{BFD_RELOC_CRX_REGREL28, R_CRX_REGREL28},
{BFD_RELOC_CRX_REGREL32, R_CRX_REGREL32},
{BFD_RELOC_CRX_ABS16, R_CRX_ABS16},
{BFD_RELOC_CRX_ABS32, R_CRX_ABS32},
{BFD_RELOC_CRX_NUM8, R_CRX_NUM8},
{BFD_RELOC_CRX_NUM16, R_CRX_NUM16},
{BFD_RELOC_CRX_NUM32, R_CRX_NUM32},
{BFD_RELOC_CRX_IMM16, R_CRX_IMM16},
{BFD_RELOC_CRX_IMM32, R_CRX_IMM32},
{BFD_RELOC_CRX_SWITCH8, R_CRX_SWITCH8},
{BFD_RELOC_CRX_SWITCH16, R_CRX_SWITCH16},
{BFD_RELOC_CRX_SWITCH32, R_CRX_SWITCH32}
};
static reloc_howto_type crx_elf_howto_table[] =
{
HOWTO (R_CRX_NONE, /* type */
0, /* rightshift */
0, /* size */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL4, /* type */
1, /* rightshift */
1, /* size */
4, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL4", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xf, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL8, /* type */
1, /* rightshift */
1, /* size */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL8_CMP, /* type */
1, /* rightshift */
1, /* size */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL8_CMP", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL16, /* type */
1, /* rightshift */
2, /* size */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL24, /* type */
1, /* rightshift */
4, /* size */
24, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL24", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REL32, /* type */
1, /* rightshift */
4, /* size */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REL32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL12, /* type */
0, /* rightshift */
2, /* size */
12, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL12", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xfff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL22, /* type */
0, /* rightshift */
4, /* size */
22, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL22", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0x3fffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL28, /* type */
0, /* rightshift */
4, /* size */
28, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL28", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xfffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_REGREL32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_REGREL32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_ABS16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_ABS16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_ABS32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_ABS32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM8, /* type */
0, /* rightshift */
1, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_NUM32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_NUM32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_IMM16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_IMM16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
HOWTO (R_CRX_IMM32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield,/* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_IMM32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* An 8 bit switch table entry. This is generated for an expression
such as ``.byte L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH8, /* type */
0, /* rightshift */
1, /* size */
8, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH8", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xff, /* dst_mask */
true), /* pcrel_offset */
/* A 16 bit switch table entry. This is generated for an expression
such as ``.word L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH16, /* type */
0, /* rightshift */
2, /* size */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH16", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* A 32 bit switch table entry. This is generated for an expression
such as ``.long L1 - L2''. The offset holds the difference
between the reloc address and L2. */
HOWTO (R_CRX_SWITCH32, /* type */
0, /* rightshift */
4, /* size */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_unsigned, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRX_SWITCH32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
true) /* pcrel_offset */
};
/* Retrieve a howto ptr using a BFD reloc_code. */
static reloc_howto_type *
elf_crx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < R_CRX_MAX; i++)
if (code == crx_reloc_map[i].bfd_reloc_enum)
return &crx_elf_howto_table[crx_reloc_map[i].crx_reloc_type];
printf ("This relocation Type is not supported -0x%x\n", code);
return 0;
}
static reloc_howto_type *
elf_crx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (crx_elf_howto_table) / sizeof (crx_elf_howto_table[0]);
i++)
if (crx_elf_howto_table[i].name != NULL
&& strcasecmp (crx_elf_howto_table[i].name, r_name) == 0)
return &crx_elf_howto_table[i];
return NULL;
}
/* Retrieve a howto ptr using an internal relocation entry. */
static bool
elf_crx_info_to_howto (bfd *abfd, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type = ELF32_R_TYPE (dst->r_info);
if (r_type >= R_CRX_MAX)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
cache_ptr->howto = &crx_elf_howto_table[r_type];
return true;
}
/* Perform a relocation as part of a final link. */
static bfd_reloc_status_type
crx_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;
switch (r_type)
{
case R_CRX_IMM16:
case R_CRX_IMM32:
case R_CRX_ABS16:
case R_CRX_ABS32:
case R_CRX_REL8_CMP:
case R_CRX_REL16:
case R_CRX_REL24:
case R_CRX_REL32:
case R_CRX_REGREL12:
case R_CRX_REGREL22:
case R_CRX_REGREL28:
case R_CRX_REGREL32:
/* '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_CRX_REL4:
/* This relocation type is used only in 'Branch if Equal to 0'
instructions and requires special handling. */
Rvalue -= 1;
break;
case R_CRX_NONE:
return bfd_reloc_ok;
break;
case R_CRX_SWITCH8:
case R_CRX_SWITCH16:
case R_CRX_SWITCH32:
/* We only care about the addend, where the difference between
expressions is kept. */
Rvalue = 0;
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;
reloc_bits = ((bfd_vma) 1 << (howto->bitsize - 1) << 1) - 1;
if ((check & ~reloc_bits) != 0
&& (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 ((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 >>= howto->rightshift;
/* Apply dst_mask to select only relocatable part of the insn. */
Rvalue &= howto->dst_mask;
switch (bfd_get_reloc_size (howto))
{
case 1:
if (r_type == R_CRX_REL4)
{
Rvalue <<= 4;
Rvalue |= (bfd_get_8 (input_bfd, hit_data) & 0x0f);
}
bfd_put_8 (input_bfd, (unsigned char) Rvalue, hit_data);
break;
case 2:
if (r_type == R_CRX_REGREL12)
Rvalue |= (bfd_get_16 (input_bfd, hit_data) & 0xf000);
bfd_put_16 (input_bfd, Rvalue, hit_data);
break;
case 4:
if (r_type == R_CRX_REL24
|| r_type == R_CRX_REGREL22
|| r_type == R_CRX_REGREL28)
Rvalue |= (((bfd_get_16 (input_bfd, hit_data) << 16) |
bfd_get_16 (input_bfd, hit_data + 2)) & ~howto->dst_mask);
if (r_type == R_CRX_NUM32 || r_type == R_CRX_SWITCH32)
/* Relocation on DATA is purely little-endian, that is, for a
multi-byte datum, the lowest address in memory contains the
little end of the datum, that is, the least significant byte.
Therefore we use BFD's byte Putting functions. */
bfd_put_32 (input_bfd, Rvalue, hit_data);
else
/* 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 >> 16) & 0xffff, hit_data);
bfd_put_16 (input_bfd, Rvalue & 0xffff, hit_data + 2);
}
break;
default:
return bfd_reloc_notsupported;
}
return bfd_reloc_ok;
}
/* Delete some bytes from a section while relaxing. */
static bool
elf32_crx_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;
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;
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;
/* Skip if not a SWITCH relocation. */
if (ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH8
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH16
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_SWITCH32)
continue;
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;
}
/* This is a version of bfd_generic_get_relocated_section_contents
which uses elf32_crx_relocate_section. */
static bfd_byte *
elf32_crx_get_relocated_section_contents (bfd *output_bfd,
struct bfd_link_info *link_info,
struct bfd_link_order *link_order,
bfd_byte *data,
bool 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,
(Elf_Internal_Rela *) 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_crx_relocate_section (output_bfd, link_info, input_bfd,
input_section, data, internal_relocs,
isymbuf, sections))
goto error_return;
free (sections);
if (symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
}
return data;
error_return:
free (sections);
if (symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (input_section)->relocs != internal_relocs)
free (internal_relocs);
return NULL;
}
/* Relocate a CRX ELF section. */
static int
elf32_crx_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;
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 = crx_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
{
bool 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;
r = crx_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 = (const char *) 0;
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 (sec);
}
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;
}
/* This function handles relaxing for the CRX.
There's quite a few relaxing opportunites available on the CRX:
* bal/bcond:32 -> bal/bcond:16 2 bytes
* bcond:16 -> bcond:8 2 bytes
* cmpbcond:24 -> cmpbcond:8 2 bytes
* arithmetic imm32 -> arithmetic imm16 2 bytes
Symbol- and reloc-reading infrastructure copied from elf-m10200.c. */
static bool
elf32_crx_relax_section (bfd *abfd, asection *sec,
struct bfd_link_info *link_info, bool *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 (bfd_link_relocatable (link_info)
|| (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, (Elf_Internal_Rela *) 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_CRX_REL32
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL16
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_REL24
&& ELF32_R_TYPE (irel->r_info) != (int) R_CRX_IMM32)
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 32bit pc-relative branch/call into
a 16bit pc-relative branch/call. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL32)
{
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 short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Verify it's a 'bal'/'bcond' and fix the opcode. */
if ((code & 0xfff0) == 0x3170)
bfd_put_8 (abfd, 0x30, contents + irel->r_offset + 1);
else if ((code & 0xf0ff) == 0x707f)
bfd_put_8 (abfd, 0x7e, contents + irel->r_offset);
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_CRX_REL16);
/* Delete two bytes of data. */
if (!elf32_crx_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_CRX_REL16)
{
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 & 0xf0ff) != 0x707e)
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_CRX_REL8);
/* Delete two bytes of data. */
if (!elf32_crx_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 24bit pc-relative cmp&branch into
an 8bit pc-relative cmp&branch. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_REL24)
{
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
0x7e + 2 as the target will be two bytes closer if we are
able to relax. */
if ((long) value < 0x100 && (long) value > -0x100)
{
unsigned short code;
/* Get the opcode. */
code = (unsigned short) bfd_get_16 (abfd, contents + irel->r_offset);
/* Verify it's a 'cmp&branch' opcode. */
if ((code & 0xfff0) != 0x3180 && (code & 0xfff0) != 0x3190
&& (code & 0xfff0) != 0x31a0 && (code & 0xfff0) != 0x31c0
&& (code & 0xfff0) != 0x31d0 && (code & 0xfff0) != 0x31e0
/* Or a Co-processor branch ('bcop'). */
&& (code & 0xfff0) != 0x3010 && (code & 0xfff0) != 0x3110)
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, 0x30, contents + irel->r_offset + 1);
/* Fix the relocation's type. */
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
R_CRX_REL8_CMP);
/* Delete two bytes of data. */
if (!elf32_crx_relax_delete_bytes (link_info, abfd, sec,
irel->r_offset + 4, 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 32bit immediate address into
a 16bit immediate address. */
if (ELF32_R_TYPE (irel->r_info) == (int) R_CRX_IMM32)
{
bfd_vma value = symval;
/* See if the value will fit in 16 bits. */
if ((long) value < 0x7fff && (long) value > -0x8000)
{
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 & 0xf0f0) != 0x20f0)
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_CRX_IMM16);
/* Delete two bytes of data. */
if (!elf32_crx_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 (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 (elf_section_data (sec)->relocs != internal_relocs)
free (internal_relocs);
return true;
error_return:
if (symtab_hdr->contents != (unsigned char *) isymbuf)
free (isymbuf);
if (elf_section_data (sec)->this_hdr.contents != contents)
free (contents);
if (elf_section_data (sec)->relocs != internal_relocs)
free (internal_relocs);
return false;
}
/* Definitions for setting CRX target vector. */
#define TARGET_LITTLE_SYM crx_elf32_vec
#define TARGET_LITTLE_NAME "elf32-crx"
#define ELF_ARCH bfd_arch_crx
#define ELF_MACHINE_CODE EM_CRX
#define ELF_MAXPAGESIZE 0x1
#define elf_symbol_leading_char '_'
#define bfd_elf32_bfd_reloc_type_lookup elf_crx_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup \
elf_crx_reloc_name_lookup
#define elf_info_to_howto elf_crx_info_to_howto
#define elf_info_to_howto_rel NULL
#define elf_backend_relocate_section elf32_crx_relocate_section
#define bfd_elf32_bfd_relax_section elf32_crx_relax_section
#define bfd_elf32_bfd_get_relocated_section_contents \
elf32_crx_get_relocated_section_contents
#define elf_backend_can_gc_sections 1
#define elf_backend_rela_normal 1
#include "elf32-target.h"
Reference in a new issue Copy permalink