539 lines
17 KiB
C
539 lines
17 KiB
C
/* BFD back-end for Motorola 68000 COFF binaries.
|
||
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999,
|
||
2000, 2001, 2002, 2003, 2005
|
||
Free Software Foundation, Inc.
|
||
Written by 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
|
||
|
||
#include "bfd.h"
|
||
#include "sysdep.h"
|
||
#include "libbfd.h"
|
||
#include "coff/m68k.h"
|
||
#include "coff/internal.h"
|
||
#include "libcoff.h"
|
||
|
||
/* This source file is compiled multiple times for various m68k COFF
|
||
variants. The following macros control its behaviour:
|
||
|
||
TARGET_SYM
|
||
The C name of the BFD target vector. The default is m68kcoff_vec.
|
||
TARGET_NAME
|
||
The user visible target name. The default is "coff-m68k".
|
||
NAMES_HAVE_UNDERSCORE
|
||
Whether symbol names have an underscore.
|
||
ONLY_DECLARE_RELOCS
|
||
Only declare the relocation howto array. Don't actually compile
|
||
it. The actual array will be picked up in another version of the
|
||
file.
|
||
STATIC_RELOCS
|
||
Make the relocation howto array, and associated functions, static.
|
||
COFF_COMMON_ADDEND
|
||
If this is defined, then, for a relocation against a common
|
||
symbol, the object file holds the value (the size) of the common
|
||
symbol. If this is not defined, then, for a relocation against a
|
||
common symbol, the object file holds zero. */
|
||
|
||
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
|
||
|
||
#ifndef COFF_PAGE_SIZE
|
||
/* The page size is a guess based on ELF. */
|
||
#define COFF_PAGE_SIZE 0x2000
|
||
#endif
|
||
|
||
#ifndef COFF_COMMON_ADDEND
|
||
#define RELOC_SPECIAL_FN 0
|
||
#else
|
||
static bfd_reloc_status_type m68kcoff_common_addend_special_fn
|
||
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
|
||
static reloc_howto_type *m68kcoff_common_addend_rtype_to_howto
|
||
PARAMS ((bfd *, asection *, struct internal_reloc *,
|
||
struct coff_link_hash_entry *, struct internal_syment *,
|
||
bfd_vma *));
|
||
#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
|
||
#endif
|
||
|
||
static bfd_boolean m68k_coff_is_local_label_name
|
||
PARAMS ((bfd *, const char *));
|
||
|
||
/* On the delta, a symbol starting with L% is local. We won't see
|
||
such a symbol on other platforms, so it should be safe to always
|
||
consider it local here. */
|
||
|
||
static bfd_boolean
|
||
m68k_coff_is_local_label_name (abfd, name)
|
||
bfd *abfd;
|
||
const char *name;
|
||
{
|
||
if (name[0] == 'L' && name[1] == '%')
|
||
return TRUE;
|
||
|
||
return _bfd_coff_is_local_label_name (abfd, name);
|
||
}
|
||
|
||
#ifndef STATIC_RELOCS
|
||
/* Clean up namespace. */
|
||
#define m68kcoff_howto_table _bfd_m68kcoff_howto_table
|
||
#define m68k_rtype2howto _bfd_m68kcoff_rtype2howto
|
||
#define m68k_howto2rtype _bfd_m68kcoff_howto2rtype
|
||
#define m68k_reloc_type_lookup _bfd_m68kcoff_reloc_type_lookup
|
||
#endif
|
||
|
||
#ifdef ONLY_DECLARE_RELOCS
|
||
extern reloc_howto_type m68kcoff_howto_table[];
|
||
#else
|
||
#ifdef STATIC_RELOCS
|
||
static
|
||
#endif
|
||
reloc_howto_type m68kcoff_howto_table[] =
|
||
{
|
||
HOWTO (R_RELBYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8", TRUE, 0x000000ff,0x000000ff, FALSE),
|
||
HOWTO (R_RELWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
|
||
HOWTO (R_RELLONG, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32", TRUE, 0xffffffff,0xffffffff, FALSE),
|
||
HOWTO (R_PCRBYTE, 0, 0, 8, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8", TRUE, 0x000000ff,0x000000ff, FALSE),
|
||
HOWTO (R_PCRWORD, 0, 1, 16, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
|
||
HOWTO (R_PCRLONG, 0, 2, 32, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32", TRUE, 0xffffffff,0xffffffff, FALSE),
|
||
HOWTO (R_RELLONG_NEG, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32", TRUE, 0xffffffff,0xffffffff, FALSE),
|
||
};
|
||
#endif /* not ONLY_DECLARE_RELOCS */
|
||
|
||
#ifndef BADMAG
|
||
#define BADMAG(x) M68KBADMAG(x)
|
||
#endif
|
||
#define M68 1 /* Customize coffcode.h */
|
||
|
||
/* Turn a howto into a reloc number */
|
||
|
||
#ifdef ONLY_DECLARE_RELOCS
|
||
extern void m68k_rtype2howto PARAMS ((arelent *internal, int relocentry));
|
||
extern int m68k_howto2rtype PARAMS ((reloc_howto_type *));
|
||
extern reloc_howto_type *m68k_reloc_type_lookup
|
||
PARAMS ((bfd *, bfd_reloc_code_real_type));
|
||
#else
|
||
|
||
#ifdef STATIC_RELOCS
|
||
#define STAT_REL static
|
||
#else
|
||
#define STAT_REL
|
||
#endif
|
||
|
||
STAT_REL reloc_howto_type * m68k_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
|
||
STAT_REL int m68k_howto2rtype PARAMS ((reloc_howto_type *));
|
||
STAT_REL void m68k_rtype2howto PARAMS ((arelent *, int));
|
||
|
||
|
||
STAT_REL void
|
||
m68k_rtype2howto(internal, relocentry)
|
||
arelent *internal;
|
||
int relocentry;
|
||
{
|
||
switch (relocentry)
|
||
{
|
||
case R_RELBYTE: internal->howto = m68kcoff_howto_table + 0; break;
|
||
case R_RELWORD: internal->howto = m68kcoff_howto_table + 1; break;
|
||
case R_RELLONG: internal->howto = m68kcoff_howto_table + 2; break;
|
||
case R_PCRBYTE: internal->howto = m68kcoff_howto_table + 3; break;
|
||
case R_PCRWORD: internal->howto = m68kcoff_howto_table + 4; break;
|
||
case R_PCRLONG: internal->howto = m68kcoff_howto_table + 5; break;
|
||
case R_RELLONG_NEG: internal->howto = m68kcoff_howto_table + 6; break;
|
||
}
|
||
}
|
||
|
||
STAT_REL int
|
||
m68k_howto2rtype (internal)
|
||
reloc_howto_type *internal;
|
||
{
|
||
if (internal->pc_relative)
|
||
{
|
||
switch (internal->bitsize)
|
||
{
|
||
case 32: return R_PCRLONG;
|
||
case 16: return R_PCRWORD;
|
||
case 8: return R_PCRBYTE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
switch (internal->bitsize)
|
||
{
|
||
case 32: return R_RELLONG;
|
||
case 16: return R_RELWORD;
|
||
case 8: return R_RELBYTE;
|
||
}
|
||
}
|
||
return R_RELLONG;
|
||
}
|
||
|
||
STAT_REL reloc_howto_type *
|
||
m68k_reloc_type_lookup (abfd, code)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
switch (code)
|
||
{
|
||
default: return NULL;
|
||
case BFD_RELOC_8: return m68kcoff_howto_table + 0;
|
||
case BFD_RELOC_16: return m68kcoff_howto_table + 1;
|
||
case BFD_RELOC_CTOR:
|
||
case BFD_RELOC_32: return m68kcoff_howto_table + 2;
|
||
case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
|
||
case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
|
||
case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
|
||
/* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
|
||
}
|
||
/*NOTREACHED*/
|
||
}
|
||
|
||
#endif /* not ONLY_DECLARE_RELOCS */
|
||
|
||
#define RTYPE2HOWTO(internal, relocentry) \
|
||
m68k_rtype2howto(internal, (relocentry)->r_type)
|
||
|
||
#define SELECT_RELOC(external, internal) \
|
||
external.r_type = m68k_howto2rtype (internal)
|
||
|
||
#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
|
||
|
||
#ifndef COFF_COMMON_ADDEND
|
||
#ifndef coff_rtype_to_howto
|
||
|
||
#define coff_rtype_to_howto m68kcoff_rtype_to_howto
|
||
|
||
static reloc_howto_type *m68kcoff_rtype_to_howto
|
||
PARAMS ((bfd *, asection *, struct internal_reloc *,
|
||
struct coff_link_hash_entry *, struct internal_syment *,
|
||
bfd_vma *));
|
||
|
||
static reloc_howto_type *
|
||
m68kcoff_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
asection *sec;
|
||
struct internal_reloc *rel;
|
||
struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
|
||
struct internal_syment *sym ATTRIBUTE_UNUSED;
|
||
bfd_vma *addendp;
|
||
{
|
||
arelent relent;
|
||
reloc_howto_type *howto;
|
||
|
||
RTYPE2HOWTO (&relent, rel);
|
||
|
||
howto = relent.howto;
|
||
|
||
if (howto->pc_relative)
|
||
*addendp += sec->vma;
|
||
|
||
return howto;
|
||
}
|
||
|
||
#endif /* ! defined (coff_rtype_to_howto) */
|
||
#endif /* ! defined (COFF_COMMON_ADDEND) */
|
||
|
||
#ifdef COFF_COMMON_ADDEND
|
||
|
||
/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
|
||
value stored in the .text section for a reference to a common
|
||
symbol is the value itself plus any desired offset. (taken from
|
||
work done by Ian Taylor, Cygnus Support, for I386 COFF). */
|
||
|
||
/* If we are producing relocatable output, we need to do some
|
||
adjustments to the object file that are not done by the
|
||
bfd_perform_relocation function. This function is called by every
|
||
reloc type to make any required adjustments. */
|
||
|
||
static bfd_reloc_status_type
|
||
m68kcoff_common_addend_special_fn (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message)
|
||
bfd *abfd;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section ATTRIBUTE_UNUSED;
|
||
bfd *output_bfd;
|
||
char **error_message ATTRIBUTE_UNUSED;
|
||
{
|
||
symvalue diff;
|
||
|
||
if (output_bfd == (bfd *) NULL)
|
||
return bfd_reloc_continue;
|
||
|
||
if (bfd_is_com_section (symbol->section))
|
||
{
|
||
/* We are relocating a common symbol. The current value in the
|
||
object file is ORIG + OFFSET, where ORIG is the value of the
|
||
common symbol as seen by the object file when it was compiled
|
||
(this may be zero if the symbol was undefined) and OFFSET is
|
||
the offset into the common symbol (normally zero, but may be
|
||
non-zero when referring to a field in a common structure).
|
||
ORIG is the negative of reloc_entry->addend, which is set by
|
||
the CALC_ADDEND macro below. We want to replace the value in
|
||
the object file with NEW + OFFSET, where NEW is the value of
|
||
the common symbol which we are going to put in the final
|
||
object file. NEW is symbol->value. */
|
||
diff = symbol->value + reloc_entry->addend;
|
||
}
|
||
else
|
||
{
|
||
/* For some reason bfd_perform_relocation always effectively
|
||
ignores the addend for a COFF target when producing
|
||
relocatable output. This seems to be always wrong for 386
|
||
COFF, so we handle the addend here instead. */
|
||
diff = reloc_entry->addend;
|
||
}
|
||
|
||
#define DOIT(x) \
|
||
x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
|
||
|
||
if (diff != 0)
|
||
{
|
||
reloc_howto_type *howto = reloc_entry->howto;
|
||
unsigned char *addr = (unsigned char *) data + reloc_entry->address;
|
||
|
||
switch (howto->size)
|
||
{
|
||
case 0:
|
||
{
|
||
char x = bfd_get_8 (abfd, addr);
|
||
DOIT (x);
|
||
bfd_put_8 (abfd, x, addr);
|
||
}
|
||
break;
|
||
|
||
case 1:
|
||
{
|
||
short x = bfd_get_16 (abfd, addr);
|
||
DOIT (x);
|
||
bfd_put_16 (abfd, (bfd_vma) x, addr);
|
||
}
|
||
break;
|
||
|
||
case 2:
|
||
{
|
||
long x = bfd_get_32 (abfd, addr);
|
||
DOIT (x);
|
||
bfd_put_32 (abfd, (bfd_vma) x, addr);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
/* Now let bfd_perform_relocation finish everything up. */
|
||
return bfd_reloc_continue;
|
||
}
|
||
|
||
/* Compute the addend of a reloc. If the reloc is to a common symbol,
|
||
the object file contains the value of the common symbol. By the
|
||
time this is called, the linker may be using a different symbol
|
||
from a different object file with a different value. Therefore, we
|
||
hack wildly to locate the original symbol from this file so that we
|
||
can make the correct adjustment. This macro sets coffsym to the
|
||
symbol from the original file, and uses it to set the addend value
|
||
correctly. If this is not a common symbol, the usual addend
|
||
calculation is done, except that an additional tweak is needed for
|
||
PC relative relocs.
|
||
FIXME: This macro refers to symbols and asect; these are from the
|
||
calling function, not the macro arguments. */
|
||
|
||
#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
|
||
{ \
|
||
coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
|
||
if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
|
||
coffsym = (obj_symbols (abfd) \
|
||
+ (cache_ptr->sym_ptr_ptr - symbols)); \
|
||
else if (ptr) \
|
||
coffsym = coff_symbol_from (abfd, ptr); \
|
||
if (coffsym != (coff_symbol_type *) NULL \
|
||
&& coffsym->native->u.syment.n_scnum == 0) \
|
||
cache_ptr->addend = - coffsym->native->u.syment.n_value; \
|
||
else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
|
||
&& ptr->section != (asection *) NULL) \
|
||
cache_ptr->addend = - (ptr->section->vma + ptr->value); \
|
||
else \
|
||
cache_ptr->addend = 0; \
|
||
if (ptr && (reloc.r_type == R_PCRBYTE \
|
||
|| reloc.r_type == R_PCRWORD \
|
||
|| reloc.r_type == R_PCRLONG)) \
|
||
cache_ptr->addend += asect->vma; \
|
||
}
|
||
|
||
#ifndef coff_rtype_to_howto
|
||
|
||
/* coff-m68k.c uses the special COFF backend linker. We need to
|
||
adjust common symbols. */
|
||
|
||
static reloc_howto_type *
|
||
m68kcoff_common_addend_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
asection *sec;
|
||
struct internal_reloc *rel;
|
||
struct coff_link_hash_entry *h;
|
||
struct internal_syment *sym;
|
||
bfd_vma *addendp;
|
||
{
|
||
arelent relent;
|
||
reloc_howto_type *howto;
|
||
|
||
RTYPE2HOWTO (&relent, rel);
|
||
|
||
howto = relent.howto;
|
||
|
||
if (howto->pc_relative)
|
||
*addendp += sec->vma;
|
||
|
||
if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
|
||
{
|
||
/* This is a common symbol. The section contents include the
|
||
size (sym->n_value) as an addend. The relocate_section
|
||
function will be adding in the final value of the symbol. We
|
||
need to subtract out the current size in order to get the
|
||
correct result. */
|
||
BFD_ASSERT (h != NULL);
|
||
*addendp -= sym->n_value;
|
||
}
|
||
|
||
/* If the output symbol is common (in which case this must be a
|
||
relocatable link), we need to add in the final size of the
|
||
common symbol. */
|
||
if (h != NULL && h->root.type == bfd_link_hash_common)
|
||
*addendp += h->root.u.c.size;
|
||
|
||
return howto;
|
||
}
|
||
|
||
#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
|
||
|
||
#endif /* ! defined (coff_rtype_to_howto) */
|
||
|
||
#endif /* COFF_COMMON_ADDEND */
|
||
|
||
#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
|
||
/* Given a .data section and a .emreloc in-memory section, store
|
||
relocation information into the .emreloc section which can be
|
||
used at runtime to relocate the section. This is called by the
|
||
linker when the --embedded-relocs switch is used. This is called
|
||
after the add_symbols entry point has been called for all the
|
||
objects, and before the final_link entry point is called. */
|
||
|
||
bfd_boolean
|
||
bfd_m68k_coff_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
asection *datasec;
|
||
asection *relsec;
|
||
char **errmsg;
|
||
{
|
||
char *extsyms;
|
||
bfd_size_type symesz;
|
||
struct internal_reloc *irel, *irelend;
|
||
bfd_byte *p;
|
||
bfd_size_type amt;
|
||
|
||
BFD_ASSERT (! info->relocatable);
|
||
|
||
*errmsg = NULL;
|
||
|
||
if (datasec->reloc_count == 0)
|
||
return TRUE;
|
||
|
||
extsyms = obj_coff_external_syms (abfd);
|
||
symesz = bfd_coff_symesz (abfd);
|
||
|
||
irel = _bfd_coff_read_internal_relocs (abfd, datasec, TRUE, NULL, FALSE,
|
||
NULL);
|
||
irelend = irel + datasec->reloc_count;
|
||
|
||
amt = (bfd_size_type) datasec->reloc_count * 12;
|
||
relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
|
||
if (relsec->contents == NULL)
|
||
return FALSE;
|
||
|
||
p = relsec->contents;
|
||
|
||
for (; irel < irelend; irel++, p += 12)
|
||
{
|
||
asection *targetsec;
|
||
|
||
/* We are going to write a four byte longword into the runtime
|
||
reloc section. The longword will be the address in the data
|
||
section which must be relocated. It is followed by the name
|
||
of the target section NUL-padded or truncated to 8
|
||
characters. */
|
||
|
||
/* We can only relocate absolute longword relocs at run time. */
|
||
if (irel->r_type != R_RELLONG)
|
||
{
|
||
*errmsg = _("unsupported reloc type");
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return FALSE;
|
||
}
|
||
|
||
if (irel->r_symndx == -1)
|
||
targetsec = bfd_abs_section_ptr;
|
||
else
|
||
{
|
||
struct coff_link_hash_entry *h;
|
||
|
||
h = obj_coff_sym_hashes (abfd)[irel->r_symndx];
|
||
if (h == NULL)
|
||
{
|
||
struct internal_syment isym;
|
||
|
||
bfd_coff_swap_sym_in (abfd, extsyms + symesz * irel->r_symndx,
|
||
&isym);
|
||
targetsec = coff_section_from_bfd_index (abfd, isym.n_scnum);
|
||
}
|
||
else if (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
targetsec = h->root.u.def.section;
|
||
else
|
||
targetsec = NULL;
|
||
}
|
||
|
||
bfd_put_32 (abfd,
|
||
(irel->r_vaddr - datasec->vma + datasec->output_offset), p);
|
||
memset (p + 4, 0, 8);
|
||
if (targetsec != NULL)
|
||
strncpy ((char *) p + 4, targetsec->output_section->name, 8);
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
#endif /* neither ONLY_DECLARE_RELOCS not STATIC_RELOCS */
|
||
|
||
#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name
|
||
|
||
#define coff_relocate_section _bfd_coff_generic_relocate_section
|
||
|
||
#include "coffcode.h"
|
||
|
||
#ifndef TARGET_SYM
|
||
#define TARGET_SYM m68kcoff_vec
|
||
#endif
|
||
|
||
#ifndef TARGET_NAME
|
||
#define TARGET_NAME "coff-m68k"
|
||
#endif
|
||
|
||
#ifdef NAMES_HAVE_UNDERSCORE
|
||
CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL, COFF_SWAP_TABLE)
|
||
#else
|
||
CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
|
||
#endif
|