335 lines
9.3 KiB
C
335 lines
9.3 KiB
C
/* 8 and 16 bit COFF relocation functions, for BFD.
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Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1998
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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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/*
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Most of this hacked by Steve Chamberlain,
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sac@cygnus.com
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*/
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/* These routines are used by coff-h8300 and coff-z8k to do
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relocation.
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FIXME: This code should be rewritten to support the new COFF
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linker. Basically, they need to deal with COFF relocs rather than
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BFD generic relocs. They should store the relocs in some location
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where coff_link_input_bfd can find them (and coff_link_input_bfd
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should be changed to use this location rather than rereading the
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file) (unless info->keep_memory is false, in which case they should
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free up the relocs after dealing with them). */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "bfdlink.h"
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#include "genlink.h"
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#include "coff/internal.h"
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#include "libcoff.h"
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bfd_vma
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bfd_coff_reloc16_get_value (reloc, link_info, input_section)
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arelent *reloc;
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struct bfd_link_info *link_info;
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asection *input_section;
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{
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bfd_vma value;
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asymbol *symbol = *(reloc->sym_ptr_ptr);
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/* A symbol holds a pointer to a section, and an offset from the
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base of the section. To relocate, we find where the section will
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live in the output and add that in */
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if (bfd_is_und_section (symbol->section)
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|| bfd_is_com_section (symbol->section))
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{
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struct bfd_link_hash_entry *h;
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/* The symbol is undefined in this BFD. Look it up in the
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global linker hash table. FIXME: This should be changed when
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we convert this stuff to use a specific final_link function
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and change the interface to bfd_relax_section to not require
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the generic symbols. */
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h = bfd_wrapped_link_hash_lookup (input_section->owner, link_info,
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bfd_asymbol_name (symbol),
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false, false, true);
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if (h != (struct bfd_link_hash_entry *) NULL
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&& (h->type == bfd_link_hash_defined
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|| h->type == bfd_link_hash_defweak))
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value = (h->u.def.value
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+ h->u.def.section->output_section->vma
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+ h->u.def.section->output_offset);
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else if (h != (struct bfd_link_hash_entry *) NULL
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&& h->type == bfd_link_hash_common)
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value = h->u.c.size;
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else
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{
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if (! ((*link_info->callbacks->undefined_symbol)
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(link_info, bfd_asymbol_name (symbol),
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input_section->owner, input_section, reloc->address)))
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abort ();
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value = 0;
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}
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}
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else
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{
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value = symbol->value +
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symbol->section->output_offset +
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symbol->section->output_section->vma;
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}
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/* Add the value contained in the relocation */
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value += reloc->addend;
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return value;
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}
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void
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bfd_perform_slip(abfd, slip, input_section, value)
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bfd *abfd;
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unsigned int slip;
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asection *input_section;
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bfd_vma value;
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{
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asymbol **s;
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s = _bfd_generic_link_get_symbols (abfd);
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BFD_ASSERT (s != (asymbol **) NULL);
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/* Find all symbols past this point, and make them know
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what's happened */
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while (*s)
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{
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asymbol *p = *s;
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if (p->section == input_section)
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{
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/* This was pointing into this section, so mangle it */
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if (p->value > value)
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{
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p->value -= slip;
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if (p->udata.p != NULL)
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{
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struct generic_link_hash_entry *h;
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h = (struct generic_link_hash_entry *) p->udata.p;
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BFD_ASSERT (h->root.type == bfd_link_hash_defined
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|| h->root.type == bfd_link_hash_defweak);
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h->root.u.def.value -= slip;
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BFD_ASSERT (h->root.u.def.value == p->value);
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}
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}
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}
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s++;
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}
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}
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boolean
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bfd_coff_reloc16_relax_section (abfd, i, link_info, again)
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bfd *abfd;
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asection *i;
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struct bfd_link_info *link_info;
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boolean *again;
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{
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/* Get enough memory to hold the stuff */
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bfd *input_bfd = i->owner;
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asection *input_section = i;
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int *shrinks;
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int shrink = 0;
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long reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section);
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arelent **reloc_vector = NULL;
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long reloc_count;
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/* We only do global relaxation once. It is not safe to do it multiple
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times (see discussion of the "shrinks" array below). */
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*again = false;
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if (reloc_size < 0)
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return false;
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reloc_vector = (arelent **) bfd_malloc (reloc_size);
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if (!reloc_vector && reloc_size > 0)
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return false;
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/* Get the relocs and think about them */
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reloc_count =
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bfd_canonicalize_reloc (input_bfd, input_section, reloc_vector,
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_bfd_generic_link_get_symbols (input_bfd));
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if (reloc_count < 0)
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{
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free (reloc_vector);
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return false;
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}
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/* The reloc16.c and related relaxing code is very simple, the price
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for that simplicity is we can only call this function once for
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each section.
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So, to get the best results within that limitation, we do multiple
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relaxing passes over each section here. That involves keeping track
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of the "shrink" at each reloc in the section. This allows us to
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accurately determine the relative location of two relocs within
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this section.
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In theory, if we kept the "shrinks" array for each section for the
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entire link, we could use the generic relaxing code in the linker
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and get better results, particularly for jsr->bsr and 24->16 bit
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memory reference relaxations. */
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if (reloc_count > 0)
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{
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int another_pass = 0;
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/* Allocate and initialize the shrinks array for this section. */
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shrinks = (int *) bfd_malloc (reloc_count * sizeof (int));
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memset (shrinks, 0, reloc_count * sizeof (int));
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/* Loop until nothing changes in this section. */
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do {
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arelent **parent;
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unsigned int i;
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long j;
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another_pass = 0;
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for (i = 0, parent = reloc_vector; *parent; parent++, i++)
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{
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/* Let the target/machine dependent code examine each reloc
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in this section and attempt to shrink it. */
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shrink = bfd_coff_reloc16_estimate (abfd, input_section, *parent,
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shrinks[i], link_info);
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/* If it shrunk, note it in the shrinks array and set up for
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another pass. */
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if (shrink != shrinks[i])
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{
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another_pass = 1;
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for (j = i + 1; j < reloc_count; j++)
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shrinks[j] += shrink - shrinks[i];
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}
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}
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} while (another_pass);
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free((char *)shrinks);
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}
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input_section->_cooked_size -= shrink;
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free((char *)reloc_vector);
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return true;
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}
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bfd_byte *
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bfd_coff_reloc16_get_relocated_section_contents(in_abfd,
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link_info,
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link_order,
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data,
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relocateable,
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symbols)
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bfd *in_abfd;
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struct bfd_link_info *link_info;
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struct bfd_link_order *link_order;
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bfd_byte *data;
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boolean relocateable;
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asymbol **symbols;
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{
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/* Get enough memory to hold the stuff */
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bfd *input_bfd = link_order->u.indirect.section->owner;
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asection *input_section = link_order->u.indirect.section;
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long reloc_size = bfd_get_reloc_upper_bound (input_bfd, input_section);
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arelent **reloc_vector;
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long reloc_count;
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if (reloc_size < 0)
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return NULL;
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/* If producing relocateable output, don't bother to relax. */
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if (relocateable)
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return bfd_generic_get_relocated_section_contents (in_abfd, link_info,
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link_order,
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data, relocateable,
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symbols);
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/* read in the section */
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if (! bfd_get_section_contents(input_bfd,
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input_section,
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data,
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0,
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input_section->_raw_size))
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return NULL;
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reloc_vector = (arelent **) bfd_malloc((size_t) reloc_size);
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if (!reloc_vector && reloc_size != 0)
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return NULL;
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reloc_count = bfd_canonicalize_reloc (input_bfd,
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input_section,
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reloc_vector,
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symbols);
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if (reloc_count < 0)
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{
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free (reloc_vector);
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return NULL;
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}
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if (reloc_count > 0)
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{
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arelent **parent = reloc_vector;
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arelent *reloc ;
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unsigned int dst_address = 0;
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unsigned int src_address = 0;
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unsigned int run;
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unsigned int idx;
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/* Find how long a run we can do */
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while (dst_address < link_order->size)
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{
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reloc = *parent;
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if (reloc)
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{
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/* Note that the relaxing didn't tie up the addresses in the
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relocation, so we use the original address to work out the
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run of non-relocated data */
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run = reloc->address - src_address;
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parent++;
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}
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else
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{
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run = link_order->size - dst_address;
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}
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/* Copy the bytes */
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for (idx = 0; idx < run; idx++)
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{
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data[dst_address++] = data[src_address++];
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}
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/* Now do the relocation */
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if (reloc)
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{
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bfd_coff_reloc16_extra_cases (input_bfd, link_info, link_order,
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reloc, data, &src_address,
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&dst_address);
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}
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}
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}
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free((char *)reloc_vector);
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return data;
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}
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