+/* BFD back-end for Apple M68K COFF A/UX 3.x files.
+ Copyright 1996 Free Software Foundation, Inc.
+ Portions written by Richard Henderson <rth@tamu.edu>,
+ COMMON symbol munging cribbed from cf-m68klynx.c which was
+ written by Cygnus Support.
+
+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 TARGET_SYM m68kaux_coff_vec
+#define TARGET_NAME "coff-m68k-aux"
+
+#ifndef TARG_AUX
+#define TARG_AUX
+#endif
+
+#define COFF_LONG_FILENAMES
+
+/* 4k pages */
+#define COFF_PAGE_SIZE 0x1000
+
+/* On AUX, a STYP_NOLOAD|STYP_BSS section is part of a shared library. */
+#define BSS_NOLOAD_IS_SHARED_LIBRARY
+
+#define _bfd_m68kcoff_howto_table _bfd_m68kaux_howto_table
+#define _bfd_m68kcoff_rtype2howto _bfd_m68kaux_rtype2howto
+#define _bfd_m68kcoff_howto2rtype _bfd_m68kaux_howto2rtype
+#define _bfd_m68kcoff_reloc_type_lookup _bfd_m68kaux_reloc_type_lookup
+
+/* Rather than change names lots of places, reuse the same hack */
+#define LYNX_SPECIAL_FN _bfd_m68kaux_special_fn
+
+#include "bfd.h"
+#include "sysdep.h"
+
+#ifdef ANSI_PROTOTYPES
+struct internal_reloc;
+struct coff_link_hash_entry;
+struct internal_syment;
+#endif
+
+
+static bfd_reloc_status_type _bfd_m68kaux_special_fn
+ PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
+static reloc_howto_type *coff_m68k_aux_rtype_to_howto
+ PARAMS ((bfd *, asection *, struct internal_reloc *,
+ struct coff_link_hash_entry *, struct internal_syment *,
+ bfd_vma *));
+static boolean coff_m68k_aux_link_add_one_symbol
+ PARAMS ((struct bfd_link_info *, bfd *, const char *, flagword,
+ asection *, bfd_vma, const char *, boolean, boolean,
+ struct bfd_link_hash_entry **));
+
+
+#define coff_rtype_to_howto coff_m68k_aux_rtype_to_howto
+#define coff_link_add_one_symbol coff_m68k_aux_link_add_one_symbol
+
+
+/* Compute the addend of a reloc. If the reloc is to a common symbol,
+ the object file contains the value of the common symbol. By the
+ time this is called, the linker may be using a different symbol
+ from a different object file with a different value. Therefore, we
+ hack wildly to locate the original symbol from this file so that we
+ can make the correct adjustment. This macro sets coffsym to the
+ symbol from the original file, and uses it to set the addend value
+ correctly. If this is not a common symbol, the usual addend
+ calculation is done, except that an additional tweak is needed for
+ PC relative relocs.
+ FIXME: This macro refers to symbols and asect; these are from the
+ calling function, not the macro arguments. */
+
+#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
+ { \
+ coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
+ if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
+ coffsym = (obj_symbols (abfd) \
+ + (cache_ptr->sym_ptr_ptr - symbols)); \
+ else if (ptr) \
+ coffsym = coff_symbol_from (abfd, ptr); \
+ if (coffsym != (coff_symbol_type *) NULL \
+ && coffsym->native->u.syment.n_scnum == 0) \
+ cache_ptr->addend = - coffsym->native->u.syment.n_value; \
+ else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
+ && ptr->section != (asection *) NULL) \
+ cache_ptr->addend = - (ptr->section->vma + ptr->value); \
+ else \
+ cache_ptr->addend = 0; \
+ if (ptr && (reloc.r_type == R_PCRBYTE \
+ || reloc.r_type == R_PCRWORD \
+ || reloc.r_type == R_PCRLONG)) \
+ cache_ptr->addend += asect->vma; \
+ }
+
+
+
+#include "coff/aux.h" /* override coff/internal.h and coff/m68k.h */
+#include "coff-m68k.c"
+
+
+
+/* For some reason when using m68k COFF the value stored in the .text
+ section for a reference to a common symbol is the value itself plus
+ any desired offset. (taken from work done by Ian Taylor, Cygnus Support,
+ for I386 COFF). */
+
+/* If we are producing relocateable output, we need to do some
+ adjustments to the object file that are not done by the
+ bfd_perform_relocation function. This function is called by every
+ reloc type to make any required adjustments. */
+
+static bfd_reloc_status_type
+_bfd_m68kaux_special_fn (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;
+{
+ symvalue diff;
+
+ if (output_bfd == (bfd *) NULL)
+ return bfd_reloc_continue;
+
+ if (bfd_is_com_section (symbol->section))
+ {
+ /* We are relocating a common symbol. The current value in the
+ object file is ORIG + OFFSET, where ORIG is the value of the
+ common symbol as seen by the object file when it was compiled
+ (this may be zero if the symbol was undefined) and OFFSET is
+ the offset into the common symbol (normally zero, but may be
+ non-zero when referring to a field in a common structure).
+ ORIG is the negative of reloc_entry->addend, which is set by
+ the CALC_ADDEND macro below. We want to replace the value in
+ the object file with NEW + OFFSET, where NEW is the value of
+ the common symbol which we are going to put in the final
+ object file. NEW is symbol->value. */
+ diff = symbol->value + reloc_entry->addend;
+ }
+ else
+ {
+ /* For some reason bfd_perform_relocation always effectively
+ ignores the addend for a COFF target when producing
+ relocateable output. This seems to be always wrong for 386
+ COFF, so we handle the addend here instead. */
+ diff = reloc_entry->addend;
+ }
+
+#define DOIT(x) \
+ x = ((x & ~howto->dst_mask) | \
+ (((x & howto->src_mask) + diff) & howto->dst_mask))
+
+ if (diff != 0)
+ {
+ reloc_howto_type *howto = reloc_entry->howto;
+ unsigned char *addr = (unsigned char *) data + reloc_entry->address;
+
+ switch (howto->size)
+ {
+ case 0:
+ {
+ char x = bfd_get_8 (abfd, addr);
+ DOIT (x);
+ bfd_put_8 (abfd, x, addr);
+ }
+ break;
+
+ case 1:
+ {
+ short x = bfd_get_16 (abfd, addr);
+ DOIT (x);
+ bfd_put_16 (abfd, x, addr);
+ }
+ break;
+
+ case 2:
+ {
+ long x = bfd_get_32 (abfd, addr);
+ DOIT (x);
+ bfd_put_32 (abfd, x, addr);
+ }
+ break;
+
+ default:
+ abort ();
+ }
+ }
+
+ /* Now let bfd_perform_relocation finish everything up. */
+ return bfd_reloc_continue;
+}
+
+
+/* coff-m68k.c uses the special COFF backend linker. We need to
+ adjust common symbols. */
+
+/*ARGSUSED*/
+static reloc_howto_type *
+coff_m68k_aux_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;
+{
+ arelent relent;
+ reloc_howto_type *howto;
+
+ RTYPE2HOWTO (&relent, rel);
+
+ howto = relent.howto;
+
+ if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
+ {
+ /* This is a common symbol. The section contents include the
+ size (sym->n_value) as an addend. The relocate_section
+ function will be adding in the final value of the symbol. We
+ need to subtract out the current size in order to get the
+ correct result. */
+ BFD_ASSERT (h != NULL);
+ *addendp -= sym->n_value;
+ }
+
+ /* If the output symbol is common (in which case this must be a
+ relocateable link), we need to add in the final size of the
+ common symbol. */
+ if (h != NULL && h->root.type == bfd_link_hash_common)
+ *addendp += h->root.u.c.size;
+
+ return howto;
+}
+
+
+/* We need non-absolute symbols to override absolute symbols. This
+ mirrors Apple's "solution" to let a static library symbol override
+ a shared library symbol. On the whole not a good thing, given how
+ shared libraries work here, but can work if you are careful with
+ what you include in the shared object. */
+
+boolean
+coff_m68k_aux_link_add_one_symbol (info, abfd, name, flags, section, value,
+ string, copy, collect, hashp)
+ struct bfd_link_info *info;
+ bfd *abfd;
+ const char *name;
+ flagword flags;
+ asection *section;
+ bfd_vma value;
+ const char *string;
+ boolean copy;
+ boolean collect;
+ struct bfd_link_hash_entry **hashp;
+{
+ struct bfd_link_hash_entry *h;
+
+ if ((flags & (BSF_WARNING | BSF_CONSTRUCTOR | BSF_WEAK)) == 0 &&
+ !bfd_is_und_section (section) &&
+ !bfd_is_com_section (section))
+ {
+ /* The new symbol is a definition or an indirect definition */
+
+ /* This bit copied from linker.c */
+ if (hashp != NULL && *hashp != NULL)
+ {
+ h = *hashp;
+ BFD_ASSERT (strcmp (h->root.string, name) == 0);
+ }
+ else
+ {
+ h = bfd_link_hash_lookup (info->hash, name, true, copy, false);
+ if (h == NULL)
+ {
+ if (hashp != NULL)
+ *hashp = NULL;
+ return false;
+ }
+ }
+
+ if (info->notice_hash != (struct bfd_hash_table *) NULL
+ && (bfd_hash_lookup (info->notice_hash, name, false, false)
+ != (struct bfd_hash_entry *) NULL))
+ {
+ if (! (*info->callbacks->notice) (info, name, abfd, section, value))
+ return false;
+ }
+
+ if (hashp != (struct bfd_link_hash_entry **) NULL)
+ *hashp = h;
+ /* end duplication from linker.c */
+
+ if (h->type == bfd_link_hash_defined
+ || h->type == bfd_link_hash_indirect)
+ {
+ asection *msec;
+
+ if (h->type == bfd_link_hash_defined)
+ msec = h->u.def.section;
+ else
+ msec = bfd_ind_section_ptr;
+
+ if (bfd_is_abs_section (msec) && !bfd_is_abs_section (section))
+ {
+ h->u.def.section = section;
+ h->u.def.value = value;
+ return true;
+ }
+ else if (bfd_is_abs_section (section) && !bfd_is_abs_section (msec))
+ return true;
+ }
+ }
+
+ /* If we didn't exit early, finish processing in the generic routine */
+ return _bfd_generic_link_add_one_symbol (info, abfd, name, flags, section,
+ value, string, copy, collect,
+ hashp);
+}
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