282 lines
10 KiB
C
282 lines
10 KiB
C
|
/* PowerPC-specific support for 32-bit ELF
|
||
|
|
Copyright 1994 Free Software Foundation, Inc.
|
||
|
|
Written by Ian Lance Taylor, Cygnus Support.
|
||
|
|
|
||
|
|
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
|
|
||
|
|
/* I wrote this file without the benefit of a PowerPC ELF ABI. Thus,
|
||
|
|
it probably does not correspond to whatever people finally settle
|
||
|
|
on. Ian Taylor. */
|
||
|
|
|
||
|
|
#include "bfd.h"
|
||
|
|
#include "sysdep.h"
|
||
|
|
#include "libbfd.h"
|
||
|
|
#include "libelf.h"
|
||
|
|
|
||
|
|
static bfd_reloc_status_type powerpc_elf_toc16_reloc PARAMS ((bfd *abfd,
|
||
|
|
arelent *reloc,
|
||
|
|
asymbol *symbol,
|
||
|
|
PTR data,
|
||
|
|
asection *sec,
|
||
|
|
bfd *output_bfd,
|
||
|
|
char **error));
|
||
|
|
static bfd_reloc_status_type powerpc_elf_b26_reloc PARAMS ((bfd *abfd,
|
||
|
|
arelent *reloc,
|
||
|
|
asymbol *symbol,
|
||
|
|
PTR data,
|
||
|
|
asection *sec,
|
||
|
|
bfd *output_bfd,
|
||
|
|
char **error));
|
||
|
|
static const struct reloc_howto_struct *bfd_elf32_bfd_reloc_type_lookup
|
||
|
|
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
|
||
|
|
static void powerpc_info_to_howto_rel
|
||
|
|
PARAMS ((bfd *abfd, arelent *cache_ptr, Elf32_Internal_Rel *dst));
|
||
|
|
|
||
|
|
#define USE_REL
|
||
|
|
|
||
|
|
enum reloc_type
|
||
|
|
{
|
||
|
|
R_POWERPC_NONE = 0,
|
||
|
|
R_POWERPC_32,
|
||
|
|
R_POWERPC_B26,
|
||
|
|
R_POWERPC_BA26,
|
||
|
|
R_POWERPC_TOC16,
|
||
|
|
R_POWERPC_max
|
||
|
|
};
|
||
|
|
|
||
|
|
static reloc_howto_type elf_powerpc_howto_table[] =
|
||
|
|
{
|
||
|
|
/* This relocation does not do anything. */
|
||
|
|
HOWTO (R_POWERPC_NONE, /* type */
|
||
|
|
0, /* rightshift */
|
||
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
|
|
32, /* bitsize */
|
||
|
|
false, /* pc_relative */
|
||
|
|
0, /* bitpos */
|
||
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
||
|
|
bfd_elf_generic_reloc, /* special_function */
|
||
|
|
"R_POWERPC_NONE", /* name */
|
||
|
|
true, /* partial_inplace */
|
||
|
|
0, /* src_mask */
|
||
|
|
0, /* dst_mask */
|
||
|
|
false), /* pcrel_offset */
|
||
|
|
|
||
|
|
/* Standard 32 bit relocation. */
|
||
|
|
HOWTO (R_POWERPC_32, /* type */
|
||
|
|
0, /* rightshift */
|
||
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
|
|
32, /* bitsize */
|
||
|
|
false, /* pc_relative */
|
||
|
|
0, /* bitpos */
|
||
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
||
|
|
bfd_elf_generic_reloc, /* special_function */
|
||
|
|
"R_POWERPC_32", /* name */
|
||
|
|
true, /* partial_inplace */
|
||
|
|
0xffffffff, /* src_mask */
|
||
|
|
0xffffffff, /* dst_mask */
|
||
|
|
false), /* pcrel_offset */
|
||
|
|
|
||
|
|
/* 26 bit relative branch. */
|
||
|
|
HOWTO (R_POWERPC_B26, /* type */
|
||
|
|
0, /* rightshift */
|
||
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
|
|
26, /* bitsize */
|
||
|
|
true, /* pc_relative */
|
||
|
|
0, /* bitpos */
|
||
|
|
complain_overflow_signed, /* complain_on_overflow */
|
||
|
|
powerpc_elf_b26_reloc, /* special_function */
|
||
|
|
"R_POWERPC_B26", /* name */
|
||
|
|
true, /* partial_inplace */
|
||
|
|
0x3fffffc, /* src_mask */
|
||
|
|
0x3fffffc, /* dst_mask */
|
||
|
|
false), /* pcrel_offset */
|
||
|
|
|
||
|
|
/* 26 bit absolute branch. */
|
||
|
|
HOWTO (R_POWERPC_BA26, /* type */
|
||
|
|
0, /* rightshift */
|
||
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
|
|
26, /* bitsize */
|
||
|
|
false, /* pc_relative */
|
||
|
|
0, /* bitpos */
|
||
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
||
|
|
bfd_elf_generic_reloc, /* special_function */
|
||
|
|
"R_POWERPC_BA26", /* name */
|
||
|
|
true, /* partial_inplace */
|
||
|
|
0x3fffffc, /* src_mask */
|
||
|
|
0x3fffffc, /* dst_mask */
|
||
|
|
false), /* pcrel_offset */
|
||
|
|
|
||
|
|
/* 16 bit reference to TOC section. */
|
||
|
|
HOWTO (R_POWERPC_TOC16, /* type */
|
||
|
|
0, /* rightshift */
|
||
|
|
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
|
|
16, /* bitsize */
|
||
|
|
false, /* pc_relative */
|
||
|
|
0, /* bitpos */
|
||
|
|
complain_overflow_signed, /* complain_on_overflow */
|
||
|
|
powerpc_elf_toc16_reloc, /* special_function */
|
||
|
|
"R_POWERPC_TOC16", /* name */
|
||
|
|
true, /* partial_inplace */
|
||
|
|
0xffff, /* src_mask */
|
||
|
|
0xffff, /* dst_mask */
|
||
|
|
false), /* pcrel_offset */
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Handle the TOC16 reloc. We want to use the offset within the .toc
|
||
|
|
section, not the actual VMA. */
|
||
|
|
|
||
|
|
static bfd_reloc_status_type
|
||
|
|
powerpc_elf_toc16_reloc (abfd,
|
||
|
|
reloc_entry,
|
||
|
|
symbol,
|
||
|
|
data,
|
||
|
|
input_section,
|
||
|
|
output_bfd,
|
||
|
|
error_message)
|
||
|
|
bfd *abfd;
|
||
|
|
arelent *reloc_entry;
|
||
|
|
asymbol *symbol;
|
||
|
|
PTR data;
|
||
|
|
asection *input_section;
|
||
|
|
bfd *output_bfd;
|
||
|
|
char **error_message;
|
||
|
|
{
|
||
|
|
asection *sec;
|
||
|
|
|
||
|
|
/* Simply adjust the reloc addend by the negative of the VMA of the
|
||
|
|
.toc section. */
|
||
|
|
sec = bfd_get_section (*reloc_entry->sym_ptr_ptr);
|
||
|
|
if (sec == &bfd_und_section)
|
||
|
|
return bfd_reloc_continue;
|
||
|
|
BFD_ASSERT (strcmp (bfd_get_section_name (abfd, sec), ".toc") == 0);
|
||
|
|
reloc_entry->addend -= sec->output_section->vma;
|
||
|
|
return bfd_reloc_continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Handle a branch. If the next instruction is the special
|
||
|
|
instruction "cror 31,31,31", and this branch is to a stub routine
|
||
|
|
we have created, we must change the cror instruction into an
|
||
|
|
instruction which reloads the TOC register. We can detect a stub
|
||
|
|
routine because it is in a BFD named "linker stubs". FIXME: What a
|
||
|
|
hack. */
|
||
|
|
|
||
|
|
static bfd_reloc_status_type
|
||
|
|
powerpc_elf_b26_reloc (abfd,
|
||
|
|
reloc_entry,
|
||
|
|
symbol,
|
||
|
|
data,
|
||
|
|
input_section,
|
||
|
|
output_bfd,
|
||
|
|
error_message)
|
||
|
|
bfd *abfd;
|
||
|
|
arelent *reloc_entry;
|
||
|
|
asymbol *symbol;
|
||
|
|
PTR data;
|
||
|
|
asection *input_section;
|
||
|
|
bfd *output_bfd;
|
||
|
|
char **error_message;
|
||
|
|
{
|
||
|
|
if (bfd_get_section (symbol) != &bfd_und_section
|
||
|
|
&& (strcmp (bfd_get_section (symbol)->owner->filename, "linker stubs")
|
||
|
|
== 0))
|
||
|
|
{
|
||
|
|
bfd_vma val;
|
||
|
|
|
||
|
|
/* This symbol is a stub created by the linker. */
|
||
|
|
val = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address + 4);
|
||
|
|
if (val == 0x4ffffb82) /* cror 31,31,31 */
|
||
|
|
bfd_put_32 (abfd, (bfd_vma) 0x80410014, /* l r2,20(r1) */
|
||
|
|
(bfd_byte *) data + reloc_entry->address + 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (output_bfd != (bfd *) NULL
|
||
|
|
&& bfd_get_section (symbol) == &bfd_und_section)
|
||
|
|
{
|
||
|
|
bfd_size_type address;
|
||
|
|
|
||
|
|
/* If we are generating relocateable output, and the symbol is
|
||
|
|
undefined, we just want to adjust the reloc by the amount the
|
||
|
|
section moved. */
|
||
|
|
address = reloc_entry->address;
|
||
|
|
reloc_entry->address += input_section->output_offset;
|
||
|
|
return _bfd_relocate_contents (reloc_entry->howto, abfd,
|
||
|
|
- input_section->output_offset,
|
||
|
|
(bfd_byte *) data + address);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Otherwise, let bfd_perform_relocation handle it. */
|
||
|
|
return bfd_reloc_continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Map BFD reloc types to PowerPC ELF reloc types. */
|
||
|
|
|
||
|
|
struct powerpc_reloc_map
|
||
|
|
{
|
||
|
|
unsigned char bfd_reloc_val;
|
||
|
|
unsigned char elf_reloc_val;
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct powerpc_reloc_map powerpc_reloc_map[] =
|
||
|
|
{
|
||
|
|
{ BFD_RELOC_NONE, R_POWERPC_NONE, },
|
||
|
|
{ BFD_RELOC_32, R_POWERPC_32 },
|
||
|
|
{ BFD_RELOC_CTOR, R_POWERPC_32 },
|
||
|
|
{ BFD_RELOC_PPC_B26, R_POWERPC_B26 },
|
||
|
|
{ BFD_RELOC_PPC_BA26, R_POWERPC_BA26 },
|
||
|
|
{ BFD_RELOC_PPC_TOC16, R_POWERPC_TOC16 }
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct reloc_howto_struct *
|
||
|
|
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
|
||
|
|
bfd *abfd;
|
||
|
|
bfd_reloc_code_real_type code;
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0;
|
||
|
|
i < sizeof (powerpc_reloc_map) / sizeof (struct powerpc_reloc_map);
|
||
|
|
i++)
|
||
|
|
{
|
||
|
|
if (powerpc_reloc_map[i].bfd_reloc_val == code)
|
||
|
|
return &elf_powerpc_howto_table[powerpc_reloc_map[i].elf_reloc_val];
|
||
|
|
}
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set the howto pointer for a PowerPC ELF reloc. */
|
||
|
|
|
||
|
|
static void
|
||
|
|
powerpc_info_to_howto_rel (abfd, cache_ptr, dst)
|
||
|
|
bfd *abfd;
|
||
|
|
arelent *cache_ptr;
|
||
|
|
Elf32_Internal_Rel *dst;
|
||
|
|
{
|
||
|
|
BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_POWERPC_max);
|
||
|
|
cache_ptr->howto = &elf_powerpc_howto_table[ELF32_R_TYPE(dst->r_info)];
|
||
|
|
}
|
||
|
|
|
||
|
|
#define TARGET_BIG_SYM bfd_elf32_powerpc_vec
|
||
|
|
#define TARGET_BIG_NAME "elf32-powerpc"
|
||
|
|
#define ELF_ARCH bfd_arch_powerpc
|
||
|
|
#define ELF_MACHINE_CODE EM_CYGNUS_POWERPC
|
||
|
|
#define ELF_MAXPAGESIZE 0x10000
|
||
|
|
#define elf_info_to_howto 0
|
||
|
|
#define elf_info_to_howto_rel powerpc_info_to_howto_rel
|
||
|
|
|
||
|
|
#include "elf32-target.h"
|