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binutils-gdb/bfd/coff-or32.c

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/* BFD back-end for OpenRISC 1000 COFF binaries.
Copyright 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
Contributed by Ivan Guzvinec <ivang@opencores.org>
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. */
#define OR32 1
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "coff/or32.h"
#include "coff/internal.h"
#include "libcoff.h"
static long get_symbol_value
PARAMS ((asymbol *));
static bfd_reloc_status_type or32_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_boolean coff_or32_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
struct internal_reloc *, struct internal_syment *, asection **));
static bfd_boolean coff_or32_adjust_symndx
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *,
struct internal_reloc *, bfd_boolean *));
static void reloc_processing
PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
#define INSERT_HWORD(WORD,HWORD) \
(((WORD) & 0xffff0000) | ((HWORD)& 0x0000ffff))
#define EXTRACT_HWORD(WORD) \
((WORD) & 0x0000ffff)
#define SIGN_EXTEND_HWORD(HWORD) \
((HWORD) & 0x8000 ? (HWORD)|(~0xffffL) : (HWORD))
#define INSERT_JUMPTARG(WORD,JT) \
(((WORD) & 0xfc000000) | ((JT)& 0x03ffffff))
#define EXTRACT_JUMPTARG(WORD) \
((WORD) & 0x03ffffff)
#define SIGN_EXTEND_JUMPTARG(JT) \
((JT) & 0x04000000 ? (JT)|(~0x03ffffffL) : (JT))
/* Provided the symbol, returns the value reffed. */
static long
get_symbol_value (symbol)
asymbol *symbol;
{
long relocation = 0;
if (bfd_is_com_section (symbol->section))
relocation = 0;
else
relocation = symbol->value +
symbol->section->output_section->vma +
symbol->section->output_offset;
return relocation;
}
/* This function is in charge of performing all the or32 relocations. */
static bfd_reloc_status_type
or32_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol_in;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
/* The consth relocation comes in two parts, we have to remember
the state between calls, in these variables. */
static bfd_boolean part1_consth_active = FALSE;
static unsigned long part1_consth_value;
unsigned long insn;
unsigned long sym_value;
unsigned long unsigned_value;
unsigned short r_type;
long signed_value;
unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
bfd_byte *hit_data =addr + (bfd_byte *)(data);
r_type = reloc_entry->howto->type;
if (output_bfd)
{
/* 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))
{
/* Keep the state machine happy in case we're called again. */
if (r_type == R_IHIHALF)
{
part1_consth_active = TRUE;
part1_consth_value = 0;
}
return bfd_reloc_undefined;
}
if ((part1_consth_active) && (r_type != R_IHCONST))
{
part1_consth_active = FALSE;
*error_message = (char *) "Missing IHCONST";
return bfd_reloc_dangerous;
}
sym_value = get_symbol_value (symbol_in);
switch (r_type)
{
case R_IREL:
insn = bfd_get_32(abfd, hit_data);
/* Take the value in the field and sign extend it. */
signed_value = EXTRACT_JUMPTARG (insn);
signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
signed_value <<= 2;
/* See the note on the R_IREL reloc in coff_or32_relocate_section. */
if (signed_value == - (long) reloc_entry->address)
signed_value = 0;
signed_value += sym_value + reloc_entry->addend;
/* Relative jmp/call, so subtract from the value the
address of the place we're coming from. */
signed_value -= (reloc_entry->address
+ input_section->output_section->vma
+ input_section->output_offset);
if (signed_value > 0x7ffffff || signed_value < -0x8000000)
return bfd_reloc_overflow;
signed_value >>= 2;
insn = INSERT_JUMPTARG (insn, signed_value);
bfd_put_32 (abfd, insn, hit_data);
break;
case R_ILOHALF:
insn = bfd_get_32 (abfd, hit_data);
unsigned_value = EXTRACT_HWORD (insn);
unsigned_value += sym_value + reloc_entry->addend;
insn = INSERT_HWORD (insn, unsigned_value);
bfd_put_32 (abfd, insn, hit_data);
break;
case R_IHIHALF:
insn = bfd_get_32 (abfd, hit_data);
/* consth, part 1
Just get the symbol value that is referenced. */
part1_consth_active = TRUE;
part1_consth_value = sym_value + reloc_entry->addend;
/* Don't modify insn until R_IHCONST. */
break;
case R_IHCONST:
insn = bfd_get_32 (abfd, hit_data);
/* consth, part 2
Now relocate the reference. */
if (! part1_consth_active)
{
*error_message = (char *) "Missing IHIHALF";
return bfd_reloc_dangerous;
}
/* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/
unsigned_value += reloc_entry->addend; /* r_symndx */
unsigned_value += part1_consth_value;
unsigned_value = unsigned_value >> 16;
insn = INSERT_HWORD (insn, unsigned_value);
part1_consth_active = FALSE;
bfd_put_32 (abfd, insn, hit_data);
break;
case R_BYTE:
insn = bfd_get_8 (abfd, hit_data);
unsigned_value = insn + sym_value + reloc_entry->addend;
if (unsigned_value & 0xffffff00)
return bfd_reloc_overflow;
bfd_put_8 (abfd, unsigned_value, hit_data);
break;
case R_HWORD:
insn = bfd_get_16 (abfd, hit_data);
unsigned_value = insn + sym_value + reloc_entry->addend;
if (unsigned_value & 0xffff0000)
return bfd_reloc_overflow;
bfd_put_16 (abfd, insn, hit_data);
break;
case R_WORD:
insn = bfd_get_32 (abfd, hit_data);
insn += sym_value + reloc_entry->addend;
bfd_put_32 (abfd, insn, hit_data);
break;
default:
*error_message = _("Unrecognized reloc");
return bfd_reloc_dangerous;
}
return bfd_reloc_ok;
}
/* type rightshift
size
bitsize
pc-relative
bitpos
absolute
complain_on_overflow
special_function
relocation name
partial_inplace
src_mask
*/
/* FIXME: I'm not real sure about this table. */
static reloc_howto_type howto_table[] =
{
{ R_ABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "ABS", TRUE, 0xffffffff,0xffffffff, FALSE },
EMPTY_HOWTO (1),
EMPTY_HOWTO (2),
EMPTY_HOWTO (3),
EMPTY_HOWTO (4),
EMPTY_HOWTO (5),
EMPTY_HOWTO (6),
EMPTY_HOWTO (7),
EMPTY_HOWTO (8),
EMPTY_HOWTO (9),
EMPTY_HOWTO (10),
EMPTY_HOWTO (11),
EMPTY_HOWTO (12),
EMPTY_HOWTO (13),
EMPTY_HOWTO (14),
EMPTY_HOWTO (15),
EMPTY_HOWTO (16),
EMPTY_HOWTO (17),
EMPTY_HOWTO (18),
EMPTY_HOWTO (19),
EMPTY_HOWTO (20),
EMPTY_HOWTO (21),
EMPTY_HOWTO (22),
EMPTY_HOWTO (23),
{ R_IREL, 0, 3, 32, TRUE, 0, complain_overflow_signed, or32_reloc, "IREL", TRUE, 0xffffffff,0xffffffff, FALSE },
{ R_IABS, 0, 3, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "IABS", TRUE, 0xffffffff,0xffffffff, FALSE },
{ R_ILOHALF, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "ILOHALF", TRUE, 0x0000ffff,0x0000ffff, FALSE },
{ R_IHIHALF, 0, 3, 16, TRUE, 16,complain_overflow_signed, or32_reloc, "IHIHALF", TRUE, 0xffff0000,0xffff0000, FALSE },
{ R_IHCONST, 0, 3, 16, TRUE, 0, complain_overflow_signed, or32_reloc, "IHCONST", TRUE, 0xffff0000,0xffff0000, FALSE },
{ R_BYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, or32_reloc, "BYTE", TRUE, 0x000000ff,0x000000ff, FALSE },
{ R_HWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, or32_reloc, "HWORD", TRUE, 0x0000ffff,0x0000ffff, FALSE },
{ R_WORD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, or32_reloc, "WORD", TRUE, 0xffffffff,0xffffffff, FALSE },
};
#define BADMAG(x) OR32BADMAG (x)
#define RELOC_PROCESSING(relent, reloc, symbols, abfd, section) \
reloc_processing (relent, reloc, symbols, abfd, section)
static void
reloc_processing (relent,reloc, symbols, abfd, section)
arelent *relent;
struct internal_reloc *reloc;
asymbol **symbols;
bfd *abfd;
asection *section;
{
static bfd_vma ihihalf_vaddr = (bfd_vma) -1;
relent->address = reloc->r_vaddr;
relent->howto = howto_table + reloc->r_type;
if (reloc->r_type == R_IHCONST)
{
/* The address of an R_IHCONST should always be the address of
the immediately preceding R_IHIHALF. relocs generated by gas
are correct, but relocs generated by High C are different (I
can't figure out what the address means for High C). We can
handle both gas and High C by ignoring the address here, and
simply reusing the address saved for R_IHIHALF. */
if (ihihalf_vaddr == (bfd_vma) -1)
abort ();
relent->address = ihihalf_vaddr;
ihihalf_vaddr = (bfd_vma) -1;
relent->addend = reloc->r_symndx;
relent->sym_ptr_ptr= bfd_abs_section_ptr->symbol_ptr_ptr;
}
else
{
relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
relent->addend = 0;
relent->address-= section->vma;
if (reloc->r_type == R_IHIHALF)
ihihalf_vaddr = relent->address;
else if (ihihalf_vaddr != (bfd_vma) -1)
abort ();
}
}
/* The reloc processing routine for the optimized COFF linker. */
static bfd_boolean
coff_or32_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, syms, sections)
bfd *output_bfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
struct internal_reloc *relocs;
struct internal_syment *syms;
asection **sections;
{
struct internal_reloc *rel;
struct internal_reloc *relend;
bfd_boolean hihalf;
bfd_vma hihalf_val;
/* If we are performing a relocatable link, we don't need to do a
thing. The caller will take care of adjusting the reloc
addresses and symbol indices. */
if (info->relocatable)
return TRUE;
hihalf = FALSE;
hihalf_val = 0;
rel = relocs;
relend = rel + input_section->reloc_count;
for (; rel < relend; rel++)
{
long symndx;
bfd_byte *loc;
struct coff_link_hash_entry *h;
struct internal_syment *sym;
asection *sec;
bfd_vma val;
bfd_boolean overflow;
unsigned long insn;
long signed_value;
unsigned long unsigned_value;
bfd_reloc_status_type rstat;
symndx = rel->r_symndx;
loc = contents + rel->r_vaddr - input_section->vma;
if (symndx == -1 || rel->r_type == R_IHCONST)
h = NULL;
else
h = obj_coff_sym_hashes (input_bfd)[symndx];
sym = NULL;
sec = NULL;
val = 0;
/* An R_IHCONST reloc does not have a symbol. Instead, the
symbol index is an addend. R_IHCONST is always used in
conjunction with R_IHHALF. */
if (rel->r_type != R_IHCONST)
{
if (h == NULL)
{
if (symndx == -1)
sec = bfd_abs_section_ptr;
else
{
sym = syms + symndx;
sec = sections[symndx];
val = (sec->output_section->vma
+ sec->output_offset
+ sym->n_value
- sec->vma);
}
}
else
{
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
sec = h->root.u.def.section;
val = (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset);
}
else
{
if (! ((*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd, input_section,
rel->r_vaddr - input_section->vma, TRUE)))
return FALSE;
}
}
if (hihalf)
{
if (! ((*info->callbacks->reloc_dangerous)
(info, "missing IHCONST reloc", input_bfd,
input_section, rel->r_vaddr - input_section->vma)))
return FALSE;
hihalf = FALSE;
}
}
overflow = FALSE;
switch (rel->r_type)
{
default:
bfd_set_error (bfd_error_bad_value);
return FALSE;
case R_IREL:
insn = bfd_get_32 (input_bfd, loc);
/* Extract the addend. */
signed_value = EXTRACT_JUMPTARG (insn);
signed_value = SIGN_EXTEND_JUMPTARG (signed_value);
signed_value <<= 2;
/* Determine the destination of the jump. */
signed_value += val;
/* Make the destination PC relative. */
signed_value -= (input_section->output_section->vma
+ input_section->output_offset
+ (rel->r_vaddr - input_section->vma));
if (signed_value > 0x7ffffff || signed_value < - 0x8000000)
{
overflow = TRUE;
signed_value = 0;
}
/* Put the adjusted value back into the instruction. */
signed_value >>= 2;
insn = INSERT_JUMPTARG(insn, signed_value);
bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
break;
case R_ILOHALF:
insn = bfd_get_32 (input_bfd, loc);
unsigned_value = EXTRACT_HWORD (insn);
unsigned_value += val;
insn = INSERT_HWORD (insn, unsigned_value);
bfd_put_32 (input_bfd, insn, loc);
break;
case R_IHIHALF:
/* Save the value for the R_IHCONST reloc. */
hihalf = TRUE;
hihalf_val = val;
break;
case R_IHCONST:
if (! hihalf)
{
if (! ((*info->callbacks->reloc_dangerous)
(info, "missing IHIHALF reloc", input_bfd,
input_section, rel->r_vaddr - input_section->vma)))
return FALSE;
hihalf_val = 0;
}
insn = bfd_get_32 (input_bfd, loc);
unsigned_value = rel->r_symndx + hihalf_val;
unsigned_value >>= 16;
insn = INSERT_HWORD (insn, unsigned_value);
bfd_put_32 (input_bfd, (bfd_vma) insn, loc);
hihalf = FALSE;
break;
case R_BYTE:
case R_HWORD:
case R_WORD:
rstat = _bfd_relocate_contents (howto_table + rel->r_type,
input_bfd, val, loc);
if (rstat == bfd_reloc_overflow)
overflow = TRUE;
else if (rstat != bfd_reloc_ok)
abort ();
break;
}
if (overflow)
{
const char *name;
char buf[SYMNMLEN + 1];
if (symndx == -1)
name = "*ABS*";
else if (h != NULL)
name = NULL;
else if (sym == NULL)
name = "*unknown*";
else if (sym->_n._n_n._n_zeroes == 0
&& sym->_n._n_n._n_offset != 0)
name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
else
{
strncpy (buf, sym->_n._n_name, SYMNMLEN);
buf[SYMNMLEN] = '\0';
name = buf;
}
if (! ((*info->callbacks->reloc_overflow)
(info, (h ? &h->root : NULL), name,
howto_table[rel->r_type].name, (bfd_vma) 0, input_bfd,
input_section, rel->r_vaddr - input_section->vma)))
return FALSE;
}
}
return TRUE;
}
#define coff_relocate_section coff_or32_relocate_section
/* We don't want to change the symndx of a R_IHCONST reloc, since it
is actually an addend, not a symbol index at all. */
static bfd_boolean
coff_or32_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp)
bfd *obfd ATTRIBUTE_UNUSED;
struct bfd_link_info *info ATTRIBUTE_UNUSED;
bfd *ibfd ATTRIBUTE_UNUSED;
asection *sec ATTRIBUTE_UNUSED;
struct internal_reloc *irel;
bfd_boolean *adjustedp;
{
if (irel->r_type == R_IHCONST)
*adjustedp = TRUE;
else
*adjustedp = FALSE;
return TRUE;
}
#define coff_adjust_symndx coff_or32_adjust_symndx
#include "coffcode.h"
const bfd_target or32coff_big_vec =
{
"coff-or32-big", /* Name. */
bfd_target_coff_flavour,
BFD_ENDIAN_BIG, /* Data byte order is big. */
BFD_ENDIAN_BIG, /* Header byte order is big. */
(HAS_RELOC | EXEC_P | /* Object flags. */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT),
(SEC_HAS_CONTENTS | SEC_ALLOC | /* Section flags. */
SEC_LOAD | SEC_RELOC |
SEC_READONLY ),
'_', /* Leading underscore. */
'/', /* ar_pad_char. */
15, /* ar_max_namelen. */
/* Data. */
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
/* Headers. */
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
{
_bfd_dummy_target,
coff_object_p,
bfd_generic_archive_p,
_bfd_dummy_target
},
{
bfd_false,
coff_mkobject,
_bfd_generic_mkarchive,
bfd_false
},
{
bfd_false,
coff_write_object_contents,
_bfd_write_archive_contents,
bfd_false
},
BFD_JUMP_TABLE_GENERIC (coff),
BFD_JUMP_TABLE_COPY (coff),
BFD_JUMP_TABLE_CORE (_bfd_nocore),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (coff),
BFD_JUMP_TABLE_RELOCS (coff),
BFD_JUMP_TABLE_WRITE (coff),
BFD_JUMP_TABLE_LINK (coff),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
/* Alternative_target. */
#ifdef TARGET_LITTLE_SYM
& TARGET_LITTLE_SYM,
#else
NULL,
#endif
COFF_SWAP_TABLE
};
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