4.4BSD/usr/src/contrib/gdb-4.7.lbl/bfd/coff-a29k.c
/* BFD back-end for AMD 29000 COFF binaries.
Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
Contributed by David Wood at New York University 7/8/91.
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. */
#define A29K 1
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"
#include "coff/a29k.h"
#include "coff/internal.h"
#include "libcoff.h"
#define INSERT_HWORD(WORD,HWORD) \
(((WORD) & 0xff00ff00) | (((HWORD) & 0xff00) << 8) | ((HWORD)& 0xff))
#define EXTRACT_HWORD(WORD) \
(((WORD) & 0x00ff0000) >> 8) | ((WORD)& 0xff)
#define SIGN_EXTEND_HWORD(HWORD) \
((HWORD) & 0x8000 ? (HWORD)|0xffff0000 : (HWORD))
/* Provided the symbol, returns the value reffed */
static long
get_symbol_value(symbol)
asymbol *symbol;
{
long relocation = 0;
if (symbol->section == &bfd_com_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 29k relocations */
static bfd_reloc_status_type
DEFUN(a29k_reloc,(abfd, reloc_entry, symbol_in, data, input_section, output_bfd),
bfd *abfd AND
arelent *reloc_entry AND
asymbol *symbol_in AND
PTR data AND
asection *input_section AND
bfd *output_bfd)
{
/* the consth relocation comes in two parts, we have to remember
the state between calls, in these variables */
static 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 && (symbol_in->section == &bfd_und_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))
{
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"Missing IHCONST in module %s\n",abfd->filename);
part1_consth_active = false;
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_HWORD(insn) << 2;
signed_value = SIGN_EXTEND_HWORD(signed_value);
signed_value += sym_value + reloc_entry->addend;
if ((signed_value&~0x3ffff) == 0)
{ /* Absolute jmp/call */
insn |= (1<<24); /* Make it absolute */
/* FIXME: Should we change r_type to R_IABS */
}
else
{
/* 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>0x1ffff || signed_value<-0x20000)
return(bfd_reloc_outofrange);
}
signed_value >>= 2;
insn = INSERT_HWORD(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 == false) {
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"IHIHALF missing in module %s\n",
abfd->filename);
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) {
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"byte value too large in module %s\n",
abfd->filename);
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) {
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"hword value too large in module %s\n",
abfd->filename);
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:
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"Unrecognized reloc type %d, in module %s\n",
r_type,abfd->filename);
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 */
#define NA 0 /* Obsolete fields, via the documentation */
#define NAB false
static reloc_howto_type howto_table[] =
{
{R_ABS, 0, 3, NA, false, NA, NAB, true,a29k_reloc,"ABS", true, 0xffffffff,0xffffffff, false},
{1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}, {9}, {10},
{11}, {12}, {13}, {14}, {15}, {16}, {17}, {18}, {19}, {20},
{21}, {22}, {23},
{R_IREL, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"IREL", true, 0xffffffff,0xffffffff, false},
{R_IABS, 0, 3, NA, false, NA, NAB, true,a29k_reloc,"IABS", true, 0xffffffff,0xffffffff, false},
{R_ILOHALF, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"ILOHALF", true, 0x0000ffff,0x0000ffff, false},
{R_IHIHALF, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"IHIHALF", true, 0xffff0000,0xffff0000, false},
{R_IHCONST, 0, 3, NA, true, NA, NAB, true,a29k_reloc,"IHCONST", true, 0xffff0000,0xffff0000, false},
{R_BYTE, 0, 0, NA, false, NA, NAB, true,a29k_reloc,"BYTE", true, 0x000000ff,0x000000ff, false},
{R_HWORD, 0, 1, NA, false, NA, NAB, true,a29k_reloc,"HWORD", true, 0x0000ffff,0x0000ffff, false},
{R_WORD, 0, 2, NA, false, NA, NAB, true,a29k_reloc,"WORD", true, 0xffffffff,0xffffffff, false},
};
#undef NA
#define BADMAG(x) A29KBADMAG(x)
#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;
relent->howto = howto_table + reloc->r_type;
if (reloc->r_type == R_IHCONST)
{
relent->addend = reloc->r_symndx;
relent->sym_ptr_ptr= bfd_abs_section.symbol_ptr_ptr;
}
else
{
asymbol *ptr;
relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];
ptr = *(relent->sym_ptr_ptr);
if (ptr
&& ptr->the_bfd == abfd
&& ((ptr->flags & BSF_OLD_COMMON)== 0))
{
relent->addend = 0;
}
else
{
relent->addend = 0;
}
relent->address-= section->vma;
}
}
#include "coffcode.h"
bfd_target a29kcoff_big_vec =
{
"coff-a29k-big", /* 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 /* section flags */
| SEC_LOAD | SEC_RELOC
| SEC_READONLY ),
'_', /* leading underscore */
'/', /* ar_pad_char */
15, /* ar_max_namelen */
2, /* minimum section alignment */
/* data */
_do_getb64, _do_putb64, _do_getb32,
_do_putb32, _do_getb16, _do_putb16,
/* hdrs */
_do_getb64, _do_putb64, _do_getb32,
_do_putb32, _do_getb16, _do_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
},
JUMP_TABLE(coff),
COFF_SWAP_TABLE
};