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binutils-gdb/bfd/aout-ns32k.c
Richard Henderson 252b5132c7 19990502 sourceware import
1999-05-03 07:29:11 +00:00

371 lines
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/* BFD back-end for ns32k a.out-ish binaries.
Copyright (C) 1990, 91, 92, 94, 95, 96, 1998 Free Software Foundation, Inc.
Contributed by Ian Dall (idall@eleceng.adelaide.edu.au).
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#define BYTES_IN_WORD 4
#include "bfd.h"
#include "aout/aout64.h"
#include "ns32k.h"
#define MYNS(OP) CAT(ns32kaout_,OP)
reloc_howto_type *
MYNS(bfd_reloc_type_lookup)
PARAMS((bfd *abfd AND
bfd_reloc_code_real_type code));
boolean
MYNS(write_object_contents)
PARAMS((bfd *abfd));
/* Avoid multiple definitions from aoutx if supporting standard a.out format(s)
* as well as this one
*/
#define NAME(x,y) CAT3(ns32kaout,_32_,y)
void bfd_ns32k_arch PARAMS ((void));
#include "libaout.h"
#define MY(OP) MYNS(OP)
#define MY_swap_std_reloc_in MY(swap_std_reloc_in)
#define MY_swap_std_reloc_out MY(swap_std_reloc_out)
static void
MY_swap_std_reloc_in PARAMS ((bfd *abfd, struct reloc_std_external *bytes,
arelent *cache_ptr, asymbol **symbols,
bfd_size_type symcount));
static void
MY_swap_std_reloc_out PARAMS ((bfd *abfd, arelent *g,
struct reloc_std_external *natptr));
/* The ns32k series is ah, unusual, when it comes to relocation.
* There are three storage methods for relocateable objects. There
* are displacements, immediate operands and ordinary twos complement
* data. Of these, only the last fits into the standard relocation
* scheme. Immediate operands are stored huffman encoded and
* immediate operands are stored big endian (where as the natural byte
* order is little endian for this achitecture).
* Note that the ns32k displacement storage method is orthogonal to
* whether the relocation is pc relative or not. The "displacement"
* storage scheme is used for essentially all address constants. The
* displacement can be relative to zero (absolute displacement),
* relative to the pc (pc relative), the stack pointer, the frame
* pointer, the static base register and general purpose register etc.
* For example:
*
* sym1: .long . # pc relative 2's complement
* sym1: .long foo # 2's complement not pc relative
*
* self: movd @self, r0 # pc relative displacement
* movd foo, r0 # non pc relative displacement
*
* self: movd self, r0 # pc relative immediate
* movd foo, r0 # non pc relative immediate
*
* In addition, for historical reasons the encoding of the relocation types
* in the a.out format relocation entries is such that even the relocation
* methods which are standard are not encoded the standard way.
*
*/
reloc_howto_type MY(howto_table)[] =
{
/* ns32k immediate operands */
HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, false, 0, true,
_bfd_ns32k_reloc_imm, "NS32K_IMM_8",
true, 0x000000ff,0x000000ff, false),
HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, false, 0, true,
_bfd_ns32k_reloc_imm, "NS32K_IMM_16",
true, 0x0000ffff,0x0000ffff, false),
HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, false, 0, true,
_bfd_ns32k_reloc_imm, "NS32K_IMM_32",
true, 0xffffffff,0xffffffff, false),
HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, true, 0, false,
_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8",
true, 0x000000ff, 0x000000ff, false),
HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, true, 0, false,
_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16",
true, 0x0000ffff,0x0000ffff, false),
HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, true, 0, false,
_bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32",
true, 0xffffffff,0xffffffff, false),
/* ns32k displacements */
HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 8, false, 0, true,
_bfd_ns32k_reloc_disp, "NS32K_DISP_8",
true, 0x000000ff,0x000000ff, false),
HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 16, false, 0, true,
_bfd_ns32k_reloc_disp, "NS32K_DISP_16",
true, 0x0000ffff, 0x0000ffff, false),
HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 32, false, 0, true,
_bfd_ns32k_reloc_disp, "NS32K_DISP_32",
true, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 8, true, 0, false,
_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8",
true, 0x000000ff,0x000000ff, false),
HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 16, true, 0, false,
_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16",
true, 0x0000ffff,0x0000ffff, false),
HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 32, true, 0, false,
_bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32",
true, 0xffffffff,0xffffffff, false),
/* Normal 2's complement */
HOWTO (BFD_RELOC_8, 0, 0, 8, false, 0, complain_overflow_bitfield,0,
"8", true, 0x000000ff,0x000000ff, false),
HOWTO (BFD_RELOC_16, 0, 1, 16, false, 0, complain_overflow_bitfield,0,
"16", true, 0x0000ffff,0x0000ffff, false),
HOWTO (BFD_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield,0,
"32", true, 0xffffffff,0xffffffff, false),
HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, true, 0, complain_overflow_signed, 0,
"PCREL_8", true, 0x000000ff,0x000000ff, false),
HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, true, 0, complain_overflow_signed, 0,
"PCREL_16", true, 0x0000ffff,0x0000ffff, false),
HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, true, 0, complain_overflow_signed, 0,
"PCREL_32", true, 0xffffffff,0xffffffff, false),
};
#define CTOR_TABLE_RELOC_HOWTO(BFD) (MY(howto_table) + 14)
#define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06
#define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60
#define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1
#define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5
reloc_howto_type *
MY(reloc_howto)(abfd, rel, r_index, r_extern, r_pcrel)
bfd *abfd;
struct reloc_std_external *rel;
int *r_index;
int *r_extern;
int *r_pcrel;
{
unsigned int r_length;
int r_ns32k_type;
/* BFD_ASSERT(bfd_header_little_endian (abfd)); */
*r_index = ((rel->r_index[2] << 16)
| (rel->r_index[1] << 8)
| rel->r_index[0] );
*r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));
*r_pcrel = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));
r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE)
>> RELOC_STD_BITS_LENGTH_SH_LITTLE);
r_ns32k_type = ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE)
>> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
return (MY(howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type);
}
#define MY_reloc_howto(BFD,REL,IN,EX,PC) MY(reloc_howto)(BFD, REL, &IN, &EX, &PC)
void
MY(put_reloc)(abfd, r_extern, r_index, value, howto, reloc)
bfd *abfd;
int r_extern;
int r_index;
long value;
reloc_howto_type *howto;
struct reloc_std_external *reloc;
{
unsigned int r_length;
int r_pcrel;
int r_ns32k_type;
PUT_WORD (abfd, value, reloc->r_address);
r_length = howto->size ; /* Size as a power of two */
r_pcrel = (int) howto->pc_relative; /* Relative to PC? */
r_ns32k_type = (howto - MY(howto_table) )/6;
/* BFD_ASSERT (bfd_header_little_endian (abfd)); */
reloc->r_index[2] = r_index >> 16;
reloc->r_index[1] = r_index >> 8;
reloc->r_index[0] = r_index;
reloc->r_type[0] =
(r_extern? RELOC_STD_BITS_EXTERN_LITTLE: 0)
| (r_pcrel? RELOC_STD_BITS_PCREL_LITTLE: 0)
| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)
| (r_ns32k_type << RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE);
}
#define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
MY(put_reloc)(BFD, EXT, IDX, VAL, HOWTO, RELOC)
#define STAT_FOR_EXEC
#define MY_final_link_relocate _bfd_ns32k_final_link_relocate
#define MY_relocate_contents _bfd_ns32k_relocate_contents
#include <aoutx.h>
reloc_howto_type *
MY(bfd_reloc_type_lookup)(abfd,code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
#define ENTRY(i,j) case i: return &MY(howto_table)[j]
int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE;
BFD_ASSERT(ext == 0);
if (code == BFD_RELOC_CTOR)
switch (bfd_get_arch_info (abfd)->bits_per_address)
{
case 32:
code = BFD_RELOC_32;
break;
}
switch (code)
{
ENTRY(BFD_RELOC_NS32K_IMM_8, 0);
ENTRY(BFD_RELOC_NS32K_IMM_16, 1);
ENTRY(BFD_RELOC_NS32K_IMM_32, 2);
ENTRY(BFD_RELOC_NS32K_IMM_8_PCREL, 3);
ENTRY(BFD_RELOC_NS32K_IMM_16_PCREL, 4);
ENTRY(BFD_RELOC_NS32K_IMM_32_PCREL, 5);
ENTRY(BFD_RELOC_NS32K_DISP_8, 6);
ENTRY(BFD_RELOC_NS32K_DISP_16, 7);
ENTRY(BFD_RELOC_NS32K_DISP_32, 8);
ENTRY(BFD_RELOC_NS32K_DISP_8_PCREL, 9);
ENTRY(BFD_RELOC_NS32K_DISP_16_PCREL, 10);
ENTRY(BFD_RELOC_NS32K_DISP_32_PCREL, 11);
ENTRY(BFD_RELOC_8, 12);
ENTRY(BFD_RELOC_16, 13);
ENTRY(BFD_RELOC_32, 14);
ENTRY(BFD_RELOC_8_PCREL, 15);
ENTRY(BFD_RELOC_16_PCREL, 16);
ENTRY(BFD_RELOC_32_PCREL, 17);
default: return (reloc_howto_type *) NULL;
}
#undef ENTRY
}
static void
MY_swap_std_reloc_in (abfd, bytes, cache_ptr, symbols, symcount)
bfd *abfd;
struct reloc_std_external *bytes;
arelent *cache_ptr;
asymbol **symbols;
bfd_size_type symcount;
{
int r_index;
int r_extern;
int r_pcrel;
struct aoutdata *su = &(abfd->tdata.aout_data->a);
cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);
/* now the fun stuff */
cache_ptr->howto = MY_reloc_howto(abfd, bytes, r_index, r_extern, r_pcrel);
MOVE_ADDRESS(0);
}
static void
MY_swap_std_reloc_out (abfd, g, natptr)
bfd *abfd;
arelent *g;
struct reloc_std_external *natptr;
{
int r_index;
asymbol *sym = *(g->sym_ptr_ptr);
int r_extern;
unsigned int r_addend;
asection *output_section = sym->section->output_section;
r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
/* name was clobbered by aout_write_syms to be symbol index */
/* If this relocation is relative to a symbol then set the
r_index to the symbols index, and the r_extern bit.
Absolute symbols can come in in two ways, either as an offset
from the abs section, or as a symbol which has an abs value.
Check for that here. */
if (bfd_is_com_section (output_section)
|| output_section == &bfd_abs_section
|| output_section == &bfd_und_section)
{
if (bfd_abs_section.symbol == sym)
{
/* Whoops, looked like an abs symbol, but is really an offset
from the abs section */
r_index = 0;
r_extern = 0;
}
else
{
/* Fill in symbol */
r_extern = 1;
#undef KEEPIT
#define KEEPIT udata.i
r_index = (*(g->sym_ptr_ptr))->KEEPIT;
#undef KEEPIT
}
}
else
{
/* Just an ordinary section */
r_extern = 0;
r_index = output_section->target_index;
}
MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr);
}
bfd_reloc_status_type
_bfd_ns32k_relocate_contents (howto, input_bfd, relocation, location)
reloc_howto_type *howto;
bfd *input_bfd;
bfd_vma relocation;
bfd_byte *location;
{
int r_ns32k_type = (howto - MY(howto_table)) / 6;
long (*get_data) PARAMS ((bfd_byte *, long, long));
int (*put_data) PARAMS ((long, bfd_byte *, long, long));
switch (r_ns32k_type)
{
case 0:
get_data = _bfd_ns32k_get_immediate;
put_data = _bfd_ns32k_put_immediate;
break;
case 1:
get_data = _bfd_ns32k_get_displacement;
put_data = _bfd_ns32k_put_displacement;
break;
case 2:
return _bfd_relocate_contents (howto, input_bfd, relocation,
location);
/* NOT REACHED */
break;
default:
return bfd_reloc_notsupported;
}
return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation,
location, get_data, put_data);
}
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