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binutils-gdb/bfd/coff-mcore.c

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19990502 sourceware import
1999-05-03 15:29:11 +08:00
/* BFD back-end for Motorolla MCore COFF/PE
Copyright 1999
Free Software Foundation, Inc.
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, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "coff/mcore.h"
#include "coff/internal.h"
#include "coff/pe.h"
#include "libcoff.h"
#ifdef BADMAG
#undef BADMAG
#endif
#define BADMAG(x) MCOREBADMAG(x)
#ifndef NUM_ELEM
#define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0])
#endif
/* This file is compiled more than once, but we only compile the
final_link routine once. */
extern boolean mcore_bfd_coff_final_link
PARAMS ((bfd *, struct bfd_link_info *));
static struct bfd_link_hash_table * coff_mcore_link_hash_table_create
PARAMS ((bfd *));
static bfd_reloc_status_type mcore_coff_unsupported_reloc
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static boolean in_reloc_p
PARAMS ((bfd *, reloc_howto_type *));
static boolean coff_mcore_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
struct internal_reloc *, struct internal_syment *, asection **));
static reloc_howto_type * mcore_coff_reloc_type_lookup
PARAMS ((bfd *, bfd_reloc_code_real_type));
static reloc_howto_type * coff_mcore_rtype_to_howto
PARAMS ((bfd *, asection *, struct internal_reloc *,
struct coff_link_hash_entry *, struct internal_syment *, bfd_vma *));
static const bfd_target * pe_object_p
PARAMS ((bfd *));
/* The NT loader points the toc register to &toc + 32768, in order to
use the complete range of a 16-bit displacement. We have to adjust
for this when we fix up loads displaced off the toc reg. */
#define TOC_LOAD_ADJUSTMENT (-32768)
#define TOC_SECTION_NAME ".private.toc"
/* The main body of code is in coffcode.h. */
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
from smaller values. Start with zero, widen, *then* decrement. */
#define MINUS_ONE (((bfd_vma)0) - 1)
static reloc_howto_type mcore_coff_howto_table[] =
{
/* Unused: */
HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* dont complain_on_overflow */
0, /* special_function */
"ABSOLUTE", /* name */
false, /* partial_inplace */
0x00, /* src_mask */
0x00, /* dst_mask */
false), /* pcrel_offset */
HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"ADDR32", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
Should not appear in object files. */
HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */
2, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
mcore_coff_unsupported_reloc, /* special_function */
"IMM8BY4", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
Span 2k instructions == 4k bytes.
Only useful pieces at the relocated address are the opcode (5 bits) */
HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
11, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
NULL, /* special_function */
"IMM11BY2", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0x7ff, /* dst_mask */
true), /* pcrel_offset */
/* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */
HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
4, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
mcore_coff_unsupported_reloc,/* special_function */
"IMM4BY2", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
true), /* pcrel_offset */
/* 32-bit pc-relative. Eventually this will help support PIC code. */
HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
NULL, /* special_function */
"PCREL_32", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* Like PCREL_IMM11BY2, this relocation indicates that there is a
'jsri' at the specified address. There is a separate relocation
entry for the literal pool entry that it references, but we
might be able to change the jsri to a bsr if the target turns out
to be close enough [even though we won't reclaim the literal pool
entry, we'll get some runtime efficiency back]. Note that this
is a relocation that we are allowed to safely ignore. */
HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */
1, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
11, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
NULL, /* special_function */
"JSR_IMM11BY2", /* name */
false, /* partial_inplace */
0x0, /* src_mask */
0x7ff, /* dst_mask */
true) /* pcrel_offset */
};
/* Extend the coff_link_hash_table structure with a few M*Core specific fields.
This allows us to store global data here without actually creating any
global variables, which is a no-no in the BFD world. */
typedef struct coff_mcore_link_hash_table
{
/* The original coff_link_hash_table structure. MUST be first field. */
struct coff_link_hash_table root;
bfd * bfd_of_toc_owner;
long int global_toc_size;
long int import_table_size;
long int first_thunk_address;
long int thunk_size;
}
mcore_hash_table;
/* Get the MCore coff linker hash table from a link_info structure. */
#define coff_mcore_hash_table(info) \
((mcore_hash_table *) ((info)->hash))
/* Create an MCore coff linker hash table. */
static struct bfd_link_hash_table *
coff_mcore_link_hash_table_create (abfd)
bfd * abfd;
{
mcore_hash_table * ret;
ret = ((mcore_hash_table *) bfd_alloc (abfd, sizeof (* ret)));
if (ret == (mcore_hash_table *) NULL)
return NULL;
if (! _bfd_coff_link_hash_table_init
(& ret->root, abfd, _bfd_coff_link_hash_newfunc))
{
bfd_release (abfd, ret);
return (struct bfd_link_hash_table *) NULL;
}
ret->bfd_of_toc_owner = NULL;
ret->global_toc_size = 0;
ret->import_table_size = 0;
ret->first_thunk_address = 0;
ret->thunk_size = 0;
return & ret->root.root;
}
/*ARGSUSED*/
static bfd_reloc_status_type
mcore_coff_unsupported_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;
{
BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);
_bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
bfd_get_filename (abfd),
reloc_entry->howto->name,
reloc_entry->howto->type);
return bfd_reloc_notsupported;
}
/* A cheesy little macro to make the code a little more readable. */
#define HOW2MAP(bfd_rtype, mcore_rtype) \
case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype]
static reloc_howto_type *
mcore_coff_reloc_type_lookup (abfd, code)
bfd * abfd;
bfd_reloc_code_real_type code;
{
switch (code)
{
HOW2MAP (BFD_RELOC_32, IMAGE_REL_MCORE_ADDR32);
HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4, IMAGE_REL_MCORE_PCREL_IMM8BY4);
HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2, IMAGE_REL_MCORE_PCREL_IMM11BY2);
HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2, IMAGE_REL_MCORE_PCREL_IMM4BY2);
HOW2MAP (BFD_RELOC_32_PCREL, IMAGE_REL_MCORE_PCREL_32);
HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2);
default:
return NULL;
}
/*NOTREACHED*/
}
#undef HOW2MAP
#define RTYPE2HOWTO(cache_ptr, dst) \
(cache_ptr)->howto = mcore_coff_howto_table + (dst)->r_type;
static reloc_howto_type *
coff_mcore_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
bfd * abfd;
asection * sec;
struct internal_reloc * rel;
struct coff_link_hash_entry * h;
struct internal_syment * sym;
bfd_vma * addendp;
{
reloc_howto_type * howto;
if (rel->r_type >= NUM_ELEM (mcore_coff_howto_table))
return NULL;
howto = mcore_coff_howto_table + rel->r_type;
if (howto->pc_relative)
{
* addendp = sec->vma - 2; /* XXX guess - is this right ? */
/* If the symbol is defined, then the generic code is going to
add back the symbol value in order to cancel out an
adjustment it made to the addend. However, we set the addend
to 0 at the start of this function. We need to adjust here,
to avoid the adjustment the generic code will make. FIXME:
This is getting a bit hackish. */
if (sym != NULL && sym->n_scnum != 0)
* addendp -= sym->n_value;
}
else
* addendp = 0;
return howto;
}
/* Return true if this relocation should
appear in the output .reloc section. */
static boolean in_reloc_p (abfd, howto)
bfd * abfd;
reloc_howto_type * howto;
{
return ! howto->pc_relative;
}
/* The reloc processing routine for the optimized COFF linker. */
static boolean
coff_mcore_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, syms, sections)
bfd * output_bfd;
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;
boolean hihalf;
bfd_vma hihalf_val;
/* If we are performing a relocateable link, we don't need to do a
thing. The caller will take care of adjusting the reloc
addresses and symbol indices. */
if (info->relocateable)
return true;
Replace assert (about endianism) with an error message
1999-05-07 15:44:11 +08:00
/* Check if we have the same endianess */
if ( input_bfd->xvec->byteorder != output_bfd->xvec->byteorder
&& output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN)
{
(*_bfd_error_handler)
(_("%s: compiled for a %s endian system and target is %s endian.\n"),
bfd_get_filename (input_bfd),
bfd_big_endian (input_bfd) ? "big" : "little",
bfd_big_endian (output_bfd) ? "big" : "little");
bfd_set_error (bfd_error_wrong_format);
return false;
}
19990502 sourceware import
1999-05-03 15:29:11 +08:00
hihalf = false;
hihalf_val = 0;
rel = relocs;
relend = rel + input_section->reloc_count;
for (; rel < relend; rel++)
{
asection * toc_section = NULL;
bfd_vma relocation;
long symndx;
struct internal_syment * sym;
bfd_vma val;
bfd_vma addend;
bfd_reloc_status_type rstat;
bfd_byte * loc;
unsigned short r_type = rel->r_type;
reloc_howto_type * howto = NULL;
struct coff_link_hash_entry * h;
const char * my_name;
symndx = rel->r_symndx;
loc = contents + rel->r_vaddr - input_section->vma;
if (symndx == -1)
{
h = NULL;
sym = NULL;
}
else
{
h = obj_coff_sym_hashes (input_bfd)[symndx];
sym = syms + symndx;
}
/* Get the howto and initialise the addend. */
howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
sym, & addend);
if (howto == NULL)
return false;
val = 0;
if (h == NULL)
{
if (symndx == -1)
my_name = "*ABS*";
else
{
asection * sec = sections[symndx];
val = (sym->n_value
+ sec->output_section->vma
+ sec->output_offset);
if (sym == NULL)
my_name = "*unknown*";
else if ( sym->_n._n_n._n_zeroes == 0
&& sym->_n._n_n._n_offset != 0)
my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
else
{
static char buf [SYMNMLEN + 1];
strncpy (buf, sym->_n._n_name, SYMNMLEN);
buf[SYMNMLEN] = '\0';
my_name = buf;
}
}
}
else
{
if ( h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
asection * 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)))
return false;
}
my_name = h->root.root.string;
}
rstat = bfd_reloc_ok;
/* Each case must do its own relocation, setting rstat appropriately. */
switch (r_type)
{
default:
_bfd_error_handler (_("%s: unsupported relocation type 0x%02x"),
bfd_get_filename (input_bfd), r_type);
bfd_set_error (bfd_error_bad_value);
return false;
case IMAGE_REL_MCORE_ABSOLUTE:
fprintf (stderr,
_("Warning: unsupported reloc %s <file %s, section %s>\n"),
howto->name,
bfd_get_filename (input_bfd),
input_section->name);
fprintf (stderr,"sym %ld (%s), r_vaddr %ld (%lx)\n",
rel->r_symndx, my_name, (long) rel->r_vaddr,
(unsigned long) rel->r_vaddr);
break;
case IMAGE_REL_MCORE_PCREL_IMM8BY4:
case IMAGE_REL_MCORE_PCREL_IMM11BY2:
case IMAGE_REL_MCORE_PCREL_IMM4BY2:
case IMAGE_REL_MCORE_PCREL_32:
case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2:
case IMAGE_REL_MCORE_ADDR32:
rstat = _bfd_relocate_contents (howto, input_bfd, val, loc);
break;
}
switch (rstat)
{
default:
abort ();
case bfd_reloc_ok:
break;
case bfd_reloc_overflow:
if (! ((*info->callbacks->reloc_overflow)
(info, my_name, howto->name,
(bfd_vma) 0, input_bfd,
input_section, rel->r_vaddr - input_section->vma)))
return false;
}
}
return true;
}
/* Tailor coffcode.h -- macro heaven. */
/* We use the special COFF backend linker, with our own special touch. */
#define coff_bfd_reloc_type_lookup mcore_coff_reloc_type_lookup
#define coff_relocate_section coff_mcore_relocate_section
#define coff_rtype_to_howto coff_mcore_rtype_to_howto
#define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;}
#define COFF_PAGE_SIZE 0x1000
#include "coffcode.h"
static const bfd_target *
pe_object_p (abfd)
bfd * abfd;
{
#ifdef COFF_IMAGE_WITH_PE
/* We need to hack badly to handle a PE image correctly. In PE
images created by the GNU linker, the offset to the COFF header
is always the size. However, this is not the case in images
generated by other PE linkers. The PE format stores a four byte
offset to the PE signature just before the COFF header at
location 0x3c of the file. We pick up that offset, verify that
the PE signature is there, and then set ourselves up to read in
the COFF header. */
{
bfd_byte ext_offset[4];
file_ptr offset;
bfd_byte ext_signature[4];
unsigned long signature;
if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0
|| bfd_read (ext_offset, 1, 4, abfd) != 4)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
offset = bfd_h_get_32 (abfd, ext_offset);
if (bfd_seek (abfd, offset, SEEK_SET) != 0
|| bfd_read (ext_signature, 1, 4, abfd) != 4)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
signature = bfd_h_get_32 (abfd, ext_signature);
if (signature != 0x4550)
{
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
/* Here is the hack. coff_object_p wants to read filhsz bytes to
pick up the COFF header. We adjust so that that will work. 20
is the size of the mips COFF filehdr. */
if (bfd_seek (abfd, (bfd_tell (abfd) - bfd_coff_filhsz (abfd) + 20),
SEEK_SET) != 0)
{
if (bfd_get_error () != bfd_error_system_call)
bfd_set_error (bfd_error_wrong_format);
return NULL;
}
}
#endif
return coff_object_p (abfd);
}
/* The transfer vectors that lead the outside world to all of the above. */
const bfd_target
TARGET_BIG_SYM =
{
TARGET_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 | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
| SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
0, /* leading char */
'/', /* ar_pad_char */
15, /* ar_max_namelen */
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* 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, /* hdrs */
{ _bfd_dummy_target,
pe_object_p, /* bfd_check_format */
bfd_generic_archive_p, /* _bfd_dummy_target */
pe_object_p
},
{ bfd_false,
coff_mkobject,
_bfd_generic_mkarchive, /* bfd_set_format */
bfd_false
},
{ bfd_false,
coff_write_object_contents, /* bfd_write_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),
COFF_SWAP_TABLE,
};
const bfd_target
TARGET_LITTLE_SYM =
{
TARGET_LITTLE_NAME,
bfd_target_coff_flavour,
BFD_ENDIAN_LITTLE, /* data byte order is little */
BFD_ENDIAN_LITTLE, /* header byte order is little */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
| SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
0, /* leading underscore */
'/', /* ar_pad_char */
15, /* ar_max_namelen */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
/* Note that we allow an object file to be treated as a core file as well. */
{
_bfd_dummy_target,
pe_object_p, /* bfd_check_format */
bfd_generic_archive_p,
pe_object_p
},
{
bfd_false,
coff_mkobject,
_bfd_generic_mkarchive, /* bfd_set_format */
bfd_false
},
{
bfd_false,
coff_write_object_contents, /* bfd_write_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),
COFF_SWAP_TABLE,
};
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