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binutils-gdb/bfd/coff-h8300.c

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/* BFD back-end for Hitachi H8/300 COFF binaries.
Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
Written by Steve Chamberlain, <sac@cygnus.com>.
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. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"
#include "coff/h8300.h"
#include "coff/internal.h"
#include "seclet.h"
#include "libcoff.h"
extern bfd_error_vector_type bfd_error_vector;
static reloc_howto_type howto_table[] =
{
HOWTO (R_RELBYTE, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "8", true, 0x000000ff, 0x000000ff, false),
HOWTO (R_RELWORD, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_RELLONG, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "32", true, 0xffffffff, 0xffffffff, false),
HOWTO (R_PCRBYTE, 0, 0, 8, true, 0, complain_overflow_signed, 0, "DISP8", true, 0x000000ff, 0x000000ff, true),
HOWTO (R_PCRWORD, 0, 1, 16, true, 0, complain_overflow_signed, 0, "DISP16", true, 0x0000ffff, 0x0000ffff, true),
HOWTO (R_PCRLONG, 0, 2, 32, true, 0, complain_overflow_signed, 0, "DISP32", true, 0xffffffff, 0xffffffff, true),
HOWTO (R_MOVB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/8", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_MOVB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/16", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_JMP1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "16/pcrel", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_JMP2, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pcrecl/16", true, 0x000000ff, 0x000000ff, false),
HOWTO (R_JMPL1, 0, 1, 32, false, 0, complain_overflow_bitfield, 0, "24/pcrell", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_JMPL_B8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pc8/24", true, 0x000000ff, 0x000000ff, false),
HOWTO (R_MOVLB1, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "24/8", true, 0x0000ffff, 0x0000ffff, false),
HOWTO (R_MOVLB2, 0, 1, 16, false, 0, complain_overflow_bitfield, 0, "8/24", true, 0x0000ffff, 0x0000ffff, false),
};
/* Turn a howto into a reloc number */
#define SELECT_RELOC(x,howto) \
{ x = select_reloc(howto); }
#define BADMAG(x) (H8300BADMAG(x)&& H8300HBADMAG(x))
#define H8300 1 /* Customize coffcode.h */
#define __A_MAGIC_SET__
/* Code to swap in the reloc */
#define SWAP_IN_RELOC_OFFSET bfd_h_get_32
#define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
dst->r_stuff[0] = 'S'; \
dst->r_stuff[1] = 'C';
static int
select_reloc (howto)
reloc_howto_type *howto;
{
return howto->type;
}
/* Code to turn a r_type into a howto ptr, uses the above howto table
*/
static void
rtype2howto (internal, dst)
arelent *internal;
struct internal_reloc *dst;
{
switch (dst->r_type)
{
case R_RELBYTE:
internal->howto = howto_table + 0;
break;
case R_RELWORD:
internal->howto = howto_table + 1;
break;
case R_RELLONG:
internal->howto = howto_table + 2;
break;
case R_PCRBYTE:
internal->howto = howto_table + 3;
break;
case R_PCRWORD:
internal->howto = howto_table + 4;
break;
case R_PCRLONG:
internal->howto = howto_table + 5;
break;
case R_MOVB1:
internal->howto = howto_table + 6;
break;
case R_MOVB2:
internal->howto = howto_table + 7;
break;
case R_JMP1:
internal->howto = howto_table + 8;
break;
case R_JMP2:
internal->howto = howto_table + 9;
break;
case R_JMPL1:
internal->howto = howto_table + 10;
break;
case R_JMPL_B8:
internal->howto = howto_table + 11;
break;
case R_MOVLB1:
internal->howto = howto_table + 12;
break;
case R_MOVLB2:
internal->howto = howto_table + 13;
break;
default:
fprintf (stderr, "Bad reloc\n");
break;
}
}
#define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
/* Perform any necessaru magic to the addend in a reloc entry */
#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
cache_ptr->addend = ext_reloc.r_offset;
#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
reloc_processing(relent, reloc, symbols, abfd, section)
static void
DEFUN (reloc_processing, (relent, reloc, symbols, abfd, section),
arelent * relent AND
struct internal_reloc *reloc AND
asymbol ** symbols AND
bfd * abfd AND
asection * section)
{
relent->address = reloc->r_vaddr;
rtype2howto (relent, reloc);
if (((int) reloc->r_symndx) > 0)
{
relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
}
else
{
relent->sym_ptr_ptr = &(bfd_abs_symbol);
}
relent->addend = reloc->r_offset;
relent->address -= section->vma;
/* relent->section = 0;*/
}
static int
h8300_reloc16_estimate(input_section, symbols, reloc, shrink)
asection *input_section;
asymbol **symbols;
arelent *reloc;
unsigned int shrink;
{
bfd_vma value;
bfd_vma dot;
bfd_vma gap;
/* The address of the thing to be relocated will have moved back by
the size of the shrink - but we don't change reloc->address here,
since we need it to know where the relocation lives in the source
uncooked section */
/* reloc->address -= shrink; conceptual */
bfd_vma address = reloc->address - shrink;
switch (reloc->howto->type)
{
case R_MOVB2:
case R_JMP2:
shrink+=2;
break;
/* Thing is a move one byte */
case R_MOVB1:
value = bfd_coff_reloc16_get_value(reloc,0);
if (value >= 0xff00)
{
/* Change the reloc type from 16bit, possible 8 to 8bit
possible 16 */
reloc->howto = reloc->howto + 1;
/* The place to relc moves back by one */
/* This will be two bytes smaller in the long run */
shrink +=2 ;
bfd_perform_slip(symbols, 2, input_section, address);
}
break;
/* This is the 24 bit branch which could become an 8 bitter,
the relocation points to the first byte of the insn, not the
actual data */
case R_JMPL1:
value = bfd_coff_reloc16_get_value(reloc, 0);
dot = input_section->output_section->vma +
input_section->output_offset + address;
/* See if the address we're looking at within 127 bytes of where
we are, if so then we can use a small branch rather than the
jump we were going to */
gap = value - dot ;
if (-120 < (long)gap && (long)gap < 120 )
{
/* Change the reloc type from 24bit, possible 8 to 8bit
possible 32 */
reloc->howto = reloc->howto + 1;
/* This will be two bytes smaller in the long run */
shrink +=2 ;
bfd_perform_slip(symbols, 2, input_section, address);
}
break;
case R_JMP1:
value = bfd_coff_reloc16_get_value(reloc, 0);
dot = input_section->output_section->vma +
input_section->output_offset + address;
/* See if the address we're looking at within 127 bytes of where
we are, if so then we can use a small branch rather than the
jump we were going to */
gap = value - (dot - shrink);
if (-120 < (long)gap && (long)gap < 120 )
{
/* Change the reloc type from 16bit, possible 8 to 8bit
possible 16 */
reloc->howto = reloc->howto + 1;
/* The place to relc moves back by one */
/* This will be two bytes smaller in the long run */
shrink +=2 ;
bfd_perform_slip(symbols, 2, input_section, address);
}
break;
}
return shrink;
}
/* First phase of a relaxing link */
/* Reloc types
large small
R_MOVB1 R_MOVB2 mov.b with 16bit or 8 bit address
R_JMP1 R_JMP2 jmp or pcrel branch
R_JMPL1 R_JMPL_B8 24jmp or pcrel branch
R_MOVLB1 R_MOVLB2 24 or 8 bit reloc for mov.b
*/
static void
h8300_reloc16_extra_cases (abfd, seclet, reloc, data, src_ptr, dst_ptr)
bfd *abfd;
struct bfd_seclet *seclet;
arelent *reloc;
bfd_byte *data;
unsigned int *src_ptr;
unsigned int *dst_ptr;
{
unsigned int src_address = *src_ptr;
unsigned int dst_address = *dst_ptr;
switch (reloc->howto->type)
{
/* A 24 bit branch which could be a 8 bit pcrel, really pointing to
the byte before the 24bit hole, so we can treat it as a 32bit pointer */
case R_PCRBYTE:
{
bfd_vma dot = seclet->offset
+ dst_address
+ seclet->u.indirect.section->output_section->vma;
int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot;
if (gap > 127 || gap < -128)
{
bfd_error_vector.reloc_value_truncated (reloc, seclet);
}
bfd_put_8 (abfd, gap, data + dst_address);
dst_address++;
src_address++;
break;
}
case R_RELBYTE:
{
unsigned int gap = bfd_coff_reloc16_get_value (reloc, seclet);
if (gap > 0xff && gap < ~0xff)
{
bfd_error_vector.reloc_value_truncated (reloc, seclet);
}
bfd_put_8 (abfd, gap, data + dst_address);
dst_address += 1;
src_address += 1;
}
break;
case R_JMP1:
/* A relword which would have like to have been a pcrel */
case R_MOVB1:
/* A relword which would like to have been modified but
didn't make it */
case R_RELWORD:
bfd_put_16 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
data + dst_address);
dst_address += 2;
src_address += 2;
break;
case R_RELLONG:
bfd_put_32 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
data + dst_address);
dst_address += 4;
src_address += 4;
break;
case R_MOVB2:
/* Special relaxed type, there will be a gap between where we
get stuff from and where we put stuff to now
for a mov.b @aa:16 -> mov.b @aa:8
opcode 0x6a 0x0y offset
-> 0x2y off
*/
if (data[dst_address - 1] != 0x6a)
abort ();
switch (data[src_address] & 0xf0)
{
case 0x00:
/* Src is memory */
data[dst_address - 1] = (data[src_address] & 0xf) | 0x20;
break;
case 0x80:
/* Src is reg */
data[dst_address - 1] = (data[src_address] & 0xf) | 0x30;
break;
default:
abort ();
}
/* the offset must fit ! after all, what was all the relaxing
about ? */
bfd_put_8 (abfd, bfd_coff_reloc16_get_value (reloc, seclet),
data + dst_address);
/* Note the magic - src goes up by two bytes, but dst by only
one */
dst_address += 1;
src_address += 3;
break;
case R_JMP2:
/* Speciial relaxed type */
{
bfd_vma dot = seclet->offset
+ dst_address
+ seclet->u.indirect.section->output_section->vma;
int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot - 1;
if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
abort ();
bfd_put_8 (abfd, gap, data + dst_address);
switch (data[dst_address - 1])
{
case 0x5e:
/* jsr -> bsr */
bfd_put_8 (abfd, 0x55, data + dst_address - 1);
break;
case 0x5a:
/* jmp ->bra */
bfd_put_8 (abfd, 0x40, data + dst_address - 1);
break;
default:
abort ();
}
dst_address++;
src_address += 3;
break;
}
break;
case R_JMPL_B8: /* 24 bit branch which is now 8 bits */
/* Speciial relaxed type */
{
bfd_vma dot = seclet->offset
+ dst_address
+ seclet->u.indirect.section->output_section->vma;
int gap = bfd_coff_reloc16_get_value (reloc, seclet) - dot - 2;
if ((gap & ~0xff) != 0 && ((gap & 0xff00) != 0xff00))
abort ();
switch (data[src_address])
{
case 0x5e:
/* jsr -> bsr */
bfd_put_8 (abfd, 0x55, data + dst_address);
break;
case 0x5a:
/* jmp ->bra */
bfd_put_8 (abfd, 0x40, data + dst_address);
break;
default:
bfd_put_8 (abfd, 0xde, data + dst_address);
break;
}
bfd_put_8 (abfd, gap, data + dst_address + 1);
dst_address += 2;
src_address += 4;
break;
}
case R_JMPL1:
{
int v = bfd_coff_reloc16_get_value (reloc, seclet);
int o = bfd_get_32 (abfd, data + src_address);
v = (v & 0x00ffffff) | (o & 0xff000000);
bfd_put_32 (abfd, v, data + dst_address);
dst_address += 4;
src_address += 4;
}
break;
/* A 24 bit mov which could be an 8 bit move, really pointing to
the byte before the 24bit hole, so we can treat it as a 32bit pointer */
case R_MOVLB1:
{
int v = bfd_coff_reloc16_get_value (reloc, seclet);
int o = bfd_get_32 (abfd, data + dst_address);
v = (v & 0x00ffffff) | (o & 0xff000000);
bfd_put_32 (abfd, v, data + dst_address);
dst_address += 4;
src_address += 4;
}
break;
default:
abort ();
break;
}
*src_ptr = src_address;
*dst_ptr = dst_address;
}
#define coff_reloc16_extra_cases h8300_reloc16_extra_cases
#define coff_reloc16_estimate h8300_reloc16_estimate
#include "coffcode.h"
#undef coff_bfd_get_relocated_section_contents
#undef coff_bfd_relax_section
#define coff_bfd_get_relocated_section_contents bfd_coff_reloc16_get_relocated_section_contents
#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
bfd_target h8300coff_vec =
{
"coff-h8300", /* name */
bfd_target_coff_flavour,
true, /* data byte order is big */
true, /* header byte order is big */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
'_', /* leading char */
'/', /* ar_pad_char */
15, /* ar_max_namelen */
1, /* minimum section alignment */
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, coff_object_p, /* bfd_check_format */
bfd_generic_archive_p, _bfd_dummy_target},
{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},
JUMP_TABLE (coff),
COFF_SWAP_TABLE,
};
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