/* write.c - emit .o file
Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
- 2010 Free Software Foundation, Inc.
+ 2010, 2011, 2012 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
symbolS *sub_symbol, /* X_op_symbol. */
offsetT offset, /* X_add_number. */
int pcrel, /* TRUE if PC-relative relocation. */
- RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */,
+ RELOC_ENUM r_type /* Relocation type. */,
int at_beginning) /* Add to the start of the list? */
{
fixS *fixP;
static void
resolve_reloc_expr_symbols (void)
{
+ bfd_vma addr_mask = 1;
struct reloc_list *r;
+ /* Avoid a shift by the width of type. */
+ addr_mask <<= bfd_arch_bits_per_address (stdoutput) - 1;
+ addr_mask <<= 1;
+ addr_mask -= 1;
+
for (r = reloc_list; r; r = r->next)
{
+ reloc_howto_type *howto = r->u.a.howto;
expressionS *symval;
symbolS *sym;
bfd_vma offset, addend;
asection *sec;
- reloc_howto_type *howto;
resolve_symbol_value (r->u.a.offset_sym);
symval = symbol_get_value_expression (r->u.a.offset_sym);
sec = NULL;
}
else if (sym != NULL)
- symbol_mark_used_in_reloc (sym);
+ {
+ /* Convert relocs against local symbols to refer to the
+ corresponding section symbol plus offset instead. Keep
+ PC-relative relocs of the REL variety intact though to
+ prevent the offset from overflowing the relocated field,
+ unless it has enough bits to cover the whole address
+ space. */
+ if (S_IS_LOCAL (sym) && !symbol_section_p (sym)
+ && !(howto->partial_inplace
+ && howto->pc_relative
+ && howto->src_mask != addr_mask))
+ {
+ asection *symsec = S_GET_SEGMENT (sym);
+ if (!(((symsec->flags & SEC_MERGE) != 0
+ && addend != 0)
+ || (symsec->flags & SEC_THREAD_LOCAL) != 0))
+ {
+ addend += S_GET_VALUE (sym);
+ sym = section_symbol (symsec);
+ }
+ }
+ symbol_mark_used_in_reloc (sym);
+ }
}
if (sym == NULL)
{
sym = abs_section_sym;
}
- howto = r->u.a.howto;
-
r->u.b.sec = sec;
r->u.b.s = symbol_get_bfdsym (sym);
r->u.b.r.sym_ptr_ptr = &r->u.b.s;
sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy);
if (fixP->fx_addsy != NULL
&& sub_symbol_segment == add_symbol_segment
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
&& !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment))
{
add_number += S_GET_VALUE (fixP->fx_addsy);
#endif
}
else if (sub_symbol_segment == absolute_section
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
&& !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
fixP->fx_subsy = NULL;
}
else if (sub_symbol_segment == this_segment
+ && !S_FORCE_RELOC (fixP->fx_subsy, 0)
&& !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
if (fixP->fx_addsy)
{
if (add_symbol_segment == this_segment
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
&& !TC_FORCE_RELOCATION_LOCAL (fixP))
{
/* This fixup was made when the symbol's segment was
fixP->fx_pcrel = 0;
}
else if (add_symbol_segment == absolute_section
+ && !S_FORCE_RELOC (fixP->fx_addsy, 0)
&& !TC_FORCE_RELOCATION_ABS (fixP))
{
add_number += S_GET_VALUE (fixP->fx_addsy);
}
}
+static fragS *
+get_frag_for_reloc (fragS *last_frag,
+ const segment_info_type *seginfo,
+ const struct reloc_list *r)
+{
+ fragS *f;
+
+ for (f = last_frag; f != NULL; f = f->fr_next)
+ if (f->fr_address <= r->u.b.r.address
+ && r->u.b.r.address < f->fr_address + f->fr_fix)
+ return f;
+
+ for (f = seginfo->frchainP->frch_root; f != NULL; f = f->fr_next)
+ if (f->fr_address <= r->u.b.r.address
+ && r->u.b.r.address < f->fr_address + f->fr_fix)
+ return f;
+
+ as_bad_where (r->file, r->line,
+ _("reloc not within (fixed part of) section"));
+ return NULL;
+}
+
static void
write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED)
{
segment_info_type *seginfo = seg_info (sec);
- unsigned int i;
unsigned int n;
struct reloc_list *my_reloc_list, **rp, *r;
arelent **relocs;
fixS *fixp;
+ fragS *last_frag;
/* If seginfo is NULL, we did not create this section; don't do
anything with it. */
relocs = (arelent **) xcalloc (n, sizeof (arelent *));
- i = 0;
+ n = 0;
+ r = my_reloc_list;
+ last_frag = NULL;
for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
{
- int j;
int fx_size, slack;
offsetT loc;
+ arelent **reloc;
+#ifndef RELOC_EXPANSION_POSSIBLE
+ arelent *rel;
+
+ reloc = &rel;
+#endif
if (fixp->fx_done)
continue;
_("internal error: fixup not contained within frag"));
#ifndef RELOC_EXPANSION_POSSIBLE
- {
- arelent *reloc = tc_gen_reloc (sec, fixp);
-
- if (!reloc)
- continue;
- relocs[i++] = reloc;
- j = 1;
- }
+ *reloc = tc_gen_reloc (sec, fixp);
#else
- {
- arelent **reloc = tc_gen_reloc (sec, fixp);
+ reloc = tc_gen_reloc (sec, fixp);
+#endif
- for (j = 0; reloc[j]; j++)
- relocs[i++] = reloc[j];
- }
+ while (*reloc)
+ {
+ while (r != NULL && r->u.b.r.address < (*reloc)->address)
+ {
+ fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
+ if (f != NULL)
+ {
+ last_frag = f;
+ relocs[n++] = &r->u.b.r;
+ install_reloc (sec, &r->u.b.r, f, r->file, r->line);
+ }
+ r = r->next;
+ }
+ relocs[n++] = *reloc;
+ install_reloc (sec, *reloc, fixp->fx_frag,
+ fixp->fx_file, fixp->fx_line);
+#ifndef RELOC_EXPANSION_POSSIBLE
+ break;
+#else
+ reloc++;
#endif
+ }
+ }
- for ( ; j != 0; --j)
- install_reloc (sec, relocs[i - j], fixp->fx_frag,
- fixp->fx_file, fixp->fx_line);
+ while (r != NULL)
+ {
+ fragS *f = get_frag_for_reloc (last_frag, seginfo, r);
+ if (f != NULL)
+ {
+ last_frag = f;
+ relocs[n++] = &r->u.b.r;
+ install_reloc (sec, &r->u.b.r, f, r->file, r->line);
+ }
+ r = r->next;
}
- n = i;
#ifdef DEBUG4
{
- unsigned int i, j, nsyms;
+ unsigned int k, j, nsyms;
asymbol **sympp;
sympp = bfd_get_outsymbols (stdoutput);
nsyms = bfd_get_symcount (stdoutput);
- for (i = 0; i < n; i++)
- if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
+ for (k = 0; k < n; k++)
+ if (((*relocs[k]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
{
for (j = 0; j < nsyms; j++)
- if (sympp[j] == *relocs[i]->sym_ptr_ptr)
+ if (sympp[j] == *relocs[k]->sym_ptr_ptr)
break;
if (j == nsyms)
abort ();
}
#endif
- for (r = my_reloc_list; r != NULL; r = r->next)
- {
- fragS *f;
- for (f = seginfo->frchainP->frch_root; f; f = f->fr_next)
- if (f->fr_address <= r->u.b.r.address
- && r->u.b.r.address < f->fr_address + f->fr_fix)
- break;
- if (f == NULL)
- as_bad_where (r->file, r->line,
- _("reloc not within (fixed part of) section"));
- else
- {
- relocs[n++] = &r->u.b.r;
- install_reloc (sec, &r->u.b.r, f, r->file, r->line);
- }
- }
-
if (n)
{
flagword flags = bfd_get_section_flags (abfd, sec);
#ifdef DEBUG3
{
- unsigned int i;
- arelent *r;
- asymbol *s;
+ unsigned int k;
+
fprintf (stderr, "relocs for sec %s\n", sec->name);
- for (i = 0; i < n; i++)
+ for (k = 0; k < n; k++)
{
- r = relocs[i];
- s = *r->sym_ptr_ptr;
+ arelent *rel = relocs[k];
+ asymbol *s = *rel->sym_ptr_ptr;
fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n",
- i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend);
+ k, rel, (unsigned long)rel->address, s->name,
+ (unsigned long)rel->addend);
}
}
#endif
char *header;
struct z_stream_s *strm;
int x;
+ flagword flags = bfd_get_section_flags (abfd, sec);
if (seginfo == NULL
- || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
- || (bfd_get_section_flags (abfd, sec) & SEC_ALLOC))
+ || sec->size < 32
+ || (flags & (SEC_ALLOC | SEC_HAS_CONTENTS)) == SEC_ALLOC)
return;
section_name = bfd_get_section_name (stdoutput, sec);
(stdoutput, sec, buf, (file_ptr) offset,
(bfd_size_type) n_per_buf * fill_size);
if (!x)
- as_fatal (_("cannot write to output file"));
+ as_fatal (_("cannot write to output file '%s': %s"),
+ stdoutput->filename,
+ bfd_errmsg (bfd_get_error ()));
offset += n_per_buf * fill_size;
}
}
fragS *fragP; /* Track along all frags. */
#endif
+#ifdef md_pre_output_hook
+ md_pre_output_hook;
+#endif
+
/* Do we really want to write it? */
{
int n_warns, n_errs;
}
}
-#ifdef OBJ_VMS
- /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
- a routine to check for the definition of the procedure "_main",
- and if so -- fix it up so that it can be program entry point. */
- vms_check_for_main ();
-#endif /* OBJ_VMS */
+#ifdef md_pre_relax_hook
+ md_pre_relax_hook;
+#endif
/* From now on, we don't care about sub-segments. Build one frag chain
for each segment. Linked thru fr_next. */
if (stretch < 0
|| sym_frag->region == fragP->region)
target += stretch;
+ /* If we get here we know we have a forward branch. This
+ relax pass may have stretched previous instructions so
+ far that omitting STRETCH would make the branch
+ negative. Don't allow this in case the negative reach is
+ large enough to require a larger branch instruction. */
+ else if (target < address)
+ target = fragP->fr_next->fr_address + stretch;
}
}