224 lines
7.3 KiB
C
224 lines
7.3 KiB
C
/* BFD back-end for Motorola M68K COFF LynxOS files.
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Copyright 1993, 1994, 1995 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define TARGET_SYM m68klynx_coff_vec
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#define TARGET_NAME "coff-m68k-lynx"
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#define LYNXOS
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#define COFF_LONG_FILENAMES
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#define _bfd_m68kcoff_howto_table _bfd_m68klynx_howto_table
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#define _bfd_m68kcoff_rtype2howto _bfd_m68klynx_rtype2howto
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#define _bfd_m68kcoff_howto2rtype _bfd_m68klynx_howto2rtype
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#define _bfd_m68kcoff_reloc_type_lookup _bfd_m68klynx_reloc_type_lookup
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#define LYNX_SPECIAL_FN _bfd_m68klynx_special_fn
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#include "bfd.h"
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#include "sysdep.h"
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#ifdef ANSI_PROTOTYPES
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struct internal_reloc;
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struct coff_link_hash_entry;
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struct internal_syment;
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#endif
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static bfd_reloc_status_type _bfd_m68klynx_special_fn
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static reloc_howto_type *coff_m68k_lynx_rtype_to_howto
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PARAMS ((bfd *, asection *, struct internal_reloc *,
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struct coff_link_hash_entry *, struct internal_syment *,
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bfd_vma *));
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/* For some reason when using m68k COFF the value stored in the .text
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section for a reference to a common symbol is the value itself plus
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any desired offset. (taken from work done by Ian Taylor, Cygnus Support,
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for I386 COFF). */
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/* If we are producing relocateable output, we need to do some
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adjustments to the object file that are not done by the
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bfd_perform_relocation function. This function is called by every
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reloc type to make any required adjustments. */
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static bfd_reloc_status_type
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_bfd_m68klynx_special_fn (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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char **error_message;
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{
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symvalue diff;
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if (output_bfd == (bfd *) NULL)
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return bfd_reloc_continue;
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if (bfd_is_com_section (symbol->section))
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{
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/* We are relocating a common symbol. The current value in the
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object file is ORIG + OFFSET, where ORIG is the value of the
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common symbol as seen by the object file when it was compiled
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(this may be zero if the symbol was undefined) and OFFSET is
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the offset into the common symbol (normally zero, but may be
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non-zero when referring to a field in a common structure).
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ORIG is the negative of reloc_entry->addend, which is set by
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the CALC_ADDEND macro below. We want to replace the value in
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the object file with NEW + OFFSET, where NEW is the value of
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the common symbol which we are going to put in the final
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object file. NEW is symbol->value. */
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diff = symbol->value + reloc_entry->addend;
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}
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else
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{
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/* For some reason bfd_perform_relocation always effectively
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ignores the addend for a COFF target when producing
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relocateable output. This seems to be always wrong for 386
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COFF, so we handle the addend here instead. */
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diff = reloc_entry->addend;
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}
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#define DOIT(x) \
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x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
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if (diff != 0)
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{
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reloc_howto_type *howto = reloc_entry->howto;
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unsigned char *addr = (unsigned char *) data + reloc_entry->address;
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switch (howto->size)
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{
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case 0:
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{
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char x = bfd_get_8 (abfd, addr);
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DOIT (x);
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bfd_put_8 (abfd, x, addr);
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}
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break;
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case 1:
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{
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short x = bfd_get_16 (abfd, addr);
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DOIT (x);
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bfd_put_16 (abfd, x, addr);
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}
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break;
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case 2:
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{
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long x = bfd_get_32 (abfd, addr);
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DOIT (x);
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bfd_put_32 (abfd, x, addr);
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}
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break;
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default:
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abort ();
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}
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}
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/* Now let bfd_perform_relocation finish everything up. */
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return bfd_reloc_continue;
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}
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/* Compute the addend of a reloc. If the reloc is to a common symbol,
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the object file contains the value of the common symbol. By the
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time this is called, the linker may be using a different symbol
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from a different object file with a different value. Therefore, we
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hack wildly to locate the original symbol from this file so that we
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can make the correct adjustment. This macro sets coffsym to the
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symbol from the original file, and uses it to set the addend value
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correctly. If this is not a common symbol, the usual addend
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calculation is done, except that an additional tweak is needed for
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PC relative relocs.
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FIXME: This macro refers to symbols and asect; these are from the
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calling function, not the macro arguments. */
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#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
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{ \
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coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
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if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
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coffsym = (obj_symbols (abfd) \
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+ (cache_ptr->sym_ptr_ptr - symbols)); \
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else if (ptr) \
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coffsym = coff_symbol_from (abfd, ptr); \
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if (coffsym != (coff_symbol_type *) NULL \
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&& coffsym->native->u.syment.n_scnum == 0) \
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cache_ptr->addend = - coffsym->native->u.syment.n_value; \
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else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
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&& ptr->section != (asection *) NULL) \
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cache_ptr->addend = - (ptr->section->vma + ptr->value); \
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else \
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cache_ptr->addend = 0; \
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if (ptr && (reloc.r_type == R_PCRBYTE \
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|| reloc.r_type == R_PCRWORD \
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|| reloc.r_type == R_PCRLONG)) \
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cache_ptr->addend += asect->vma; \
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}
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#define coff_rtype_to_howto coff_m68k_lynx_rtype_to_howto
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#include "coff-m68k.c"
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/* coff-m68k.c uses the special COFF backend linker. We need to
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adjust common symbols.
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We can't define this function until after we have included
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coff-m68k.c, because it uses RTYPE2HOWTO. */
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/*ARGSUSED*/
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static reloc_howto_type *
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coff_m68k_lynx_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
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bfd *abfd;
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asection *sec;
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struct internal_reloc *rel;
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struct coff_link_hash_entry *h;
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struct internal_syment *sym;
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bfd_vma *addendp;
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{
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arelent relent;
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reloc_howto_type *howto;
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RTYPE2HOWTO (&relent, rel);
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howto = relent.howto;
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if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
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{
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/* This is a common symbol. The section contents include the
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size (sym->n_value) as an addend. The relocate_section
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function will be adding in the final value of the symbol. We
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need to subtract out the current size in order to get the
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correct result. */
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BFD_ASSERT (h != NULL);
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*addendp -= sym->n_value;
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}
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/* If the output symbol is common (in which case this must be a
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relocateable link), we need to add in the final size of the
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common symbol. */
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if (h != NULL && h->root.type == bfd_link_hash_common)
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*addendp += h->root.u.c.size;
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return howto;
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}
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