#define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0)
#endif
+/* Positive values of TC_FX_SIZE_SLACK allow a target to define
+ fixups that far past the end of a frag. Having such fixups
+ is of course most most likely a bug in setting fx_size correctly.
+ A negative value disables the fixup check entirely, which is
+ appropriate for something like the Renesas / SuperH SH_COUNT
+ reloc. */
+#ifndef TC_FX_SIZE_SLACK
+#define TC_FX_SIZE_SLACK(FIX) 0
+#endif
+
/* Used to control final evaluation of expressions. */
int finalize_syms = 0;
/* Remember the value of dot when parsing expressions. */
addressT dot_value;
+/* Relocs generated by ".reloc" pseudo. */
+struct reloc_list* reloc_list;
+
void print_fixup (fixS *);
/* We generally attach relocs to frag chains. However, after we have
if (size > 0 && ! seginfo->bss)
flags |= SEC_HAS_CONTENTS;
- /* @@ This is just an approximation. */
- if (seginfo && seginfo->fix_root)
- flags |= SEC_RELOC;
- else
- flags &= ~SEC_RELOC;
+ flags &= ~SEC_RELOC;
x = bfd_set_section_flags (abfd, sec, flags);
assert (x);
#define EMIT_SECTION_SYMBOLS 1
#endif
+/* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries,
+ and check for validity. Convert RELOC_LIST from using U.A fields
+ to U.B fields. */
+static void
+resolve_reloc_expr_symbols (void)
+{
+ struct reloc_list *r;
+
+ for (r = reloc_list; r; r = r->next)
+ {
+ 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);
+
+ offset = 0;
+ sym = NULL;
+ if (symval->X_op == O_constant)
+ sym = r->u.a.offset_sym;
+ else if (symval->X_op == O_symbol)
+ {
+ sym = symval->X_add_symbol;
+ offset = symval->X_add_number;
+ symval = symbol_get_value_expression (symval->X_add_symbol);
+ }
+ if (sym == NULL
+ || symval->X_op != O_constant
+ || (sec = S_GET_SEGMENT (sym)) == NULL
+ || !SEG_NORMAL (sec))
+ {
+ as_bad_where (r->file, r->line, _("invalid offset expression"));
+ sec = NULL;
+ }
+ else
+ offset += S_GET_VALUE (sym);
+
+ sym = NULL;
+ addend = r->u.a.addend;
+ if (r->u.a.sym != NULL)
+ {
+ resolve_symbol_value (r->u.a.sym);
+ symval = symbol_get_value_expression (r->u.a.sym);
+ if (symval->X_op == O_constant)
+ sym = r->u.a.sym;
+ else if (symval->X_op == O_symbol)
+ {
+ sym = symval->X_add_symbol;
+ addend += symval->X_add_number;
+ symval = symbol_get_value_expression (symval->X_add_symbol);
+ }
+ if (symval->X_op != O_constant)
+ {
+ as_bad_where (r->file, r->line, _("invalid reloc expression"));
+ sec = NULL;
+ }
+ else if (sym != NULL)
+ symbol_mark_used_in_reloc (sym);
+ }
+ if (sym == NULL)
+ {
+ if (abs_section_sym == NULL)
+ abs_section_sym = section_symbol (absolute_section);
+ 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;
+ r->u.b.r.address = offset;
+ r->u.b.r.addend = addend;
+ r->u.b.r.howto = howto;
+ }
+}
+
/* This pass over fixups decides whether symbols can be replaced with
section symbols. */
fixup_segment (seginfo->fix_root, sec);
}
+static void
+install_reloc (asection *sec, arelent *reloc, fragS *fragp,
+ char *file, unsigned int line)
+{
+ char *err;
+ bfd_reloc_status_type s;
+
+ s = bfd_install_relocation (stdoutput, reloc,
+ fragp->fr_literal, fragp->fr_address,
+ sec, &err);
+ switch (s)
+ {
+ case bfd_reloc_ok:
+ break;
+ case bfd_reloc_overflow:
+ as_bad_where (file, line, _("relocation overflow"));
+ break;
+ case bfd_reloc_outofrange:
+ as_bad_where (file, line, _("relocation out of range"));
+ break;
+ default:
+ as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
+ file, line, s);
+ }
+}
+
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;
- char *err;
/* If seginfo is NULL, we did not create this section; don't do
anything with it. */
n = 0;
for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
- n++;
+ if (!fixp->fx_done)
+ n++;
-#ifndef RELOC_EXPANSION_POSSIBLE
- /* Set up reloc information as well. */
- relocs = xcalloc (n, sizeof (arelent *));
+#ifdef RELOC_EXPANSION_POSSIBLE
+ n *= MAX_RELOC_EXPANSION;
+#endif
- i = 0;
- for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
+ /* Extract relocs for this section from reloc_list. */
+ rp = &reloc_list;
+ my_reloc_list = NULL;
+ while ((r = *rp) != NULL)
{
- arelent *reloc;
- bfd_reloc_status_type s;
- symbolS *sym;
-
- if (fixp->fx_done)
- {
- n--;
- continue;
- }
-
- reloc = tc_gen_reloc (sec, fixp);
- if (!reloc)
+ if (r->u.b.sec == sec)
{
- n--;
- continue;
+ *rp = r->next;
+ r->next = my_reloc_list;
+ my_reloc_list = r;
+ n++;
}
-
- /*
- This test is triggered inappropriately for the SH:
- if (fixp->fx_where + fixp->fx_size
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
- abort ();
- */
-
- s = bfd_install_relocation (stdoutput, reloc,
- fixp->fx_frag->fr_literal,
- fixp->fx_frag->fr_address,
- sec, &err);
- switch (s)
- {
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation overflow"));
- break;
- case bfd_reloc_outofrange:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation out of range"));
- break;
- default:
- as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
- fixp->fx_file, fixp->fx_line, s);
- }
- relocs[i++] = reloc;
+ else
+ rp = &r->next;
}
-#else
- n = n * MAX_RELOC_EXPANSION;
- /* Set up reloc information as well. */
+
relocs = xcalloc (n, sizeof (arelent *));
i = 0;
for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
{
- arelent **reloc;
- bfd_reloc_status_type s;
- symbolS *sym;
int j;
+ int fx_size, slack;
+ offsetT loc;
if (fixp->fx_done)
- {
- n--;
- continue;
- }
-
- reloc = tc_gen_reloc (sec, fixp);
+ continue;
- for (j = 0; reloc[j]; j++)
- {
- relocs[i++] = reloc[j];
- assert (i <= n);
- }
- if (fixp->fx_where + fixp->fx_size
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
+ fx_size = fixp->fx_size;
+ slack = TC_FX_SIZE_SLACK (fixp);
+ if (slack > 0)
+ fx_size = fx_size > slack ? fx_size - slack : 0;
+ loc = fixp->fx_where + fx_size;
+ if (slack >= 0 && loc > fixp->fx_frag->fr_fix)
as_bad_where (fixp->fx_file, fixp->fx_line,
_("internal error: fixup not contained within frag"));
- for (j = 0; reloc[j]; j++)
- {
- s = bfd_install_relocation (stdoutput, reloc[j],
- fixp->fx_frag->fr_literal,
- fixp->fx_frag->fr_address,
- sec, &err);
- switch (s)
- {
- case bfd_reloc_ok:
- break;
- case bfd_reloc_overflow:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation overflow"));
- break;
- case bfd_reloc_outofrange:
- as_bad_where (fixp->fx_file, fixp->fx_line,
- _("relocation out of range"));
- break;
- default:
- as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"),
- fixp->fx_file, fixp->fx_line, s);
- }
- }
+
+#ifndef RELOC_EXPANSION_POSSIBLE
+ {
+ arelent *reloc = tc_gen_reloc (sec, fixp);
+
+ if (!reloc)
+ continue;
+ relocs[i++] = reloc;
+ j = 1;
+ }
+#else
+ {
+ arelent **reloc = tc_gen_reloc (sec, fixp);
+
+ for (j = 0; reloc[j]; j++)
+ relocs[i++] = reloc[j];
+ }
+#endif
+
+ for ( ; j != 0; --j)
+ install_reloc (sec, relocs[i - j], fixp->fx_frag,
+ fixp->fx_file, fixp->fx_line);
}
n = i;
-#endif
#ifdef DEBUG4
{
}
#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)
- bfd_set_reloc (stdoutput, sec, relocs, n);
- else
- bfd_set_section_flags (abfd, sec,
- (bfd_get_section_flags (abfd, sec)
- & (flagword) ~SEC_RELOC));
+ {
+ flagword flags = bfd_get_section_flags (abfd, sec);
+ flags |= SEC_RELOC;
+ bfd_set_section_flags (abfd, sec, flags);
+ bfd_set_reloc (stdoutput, sec, relocs, n);
+ }
#ifdef SET_SECTION_RELOCS
SET_SECTION_RELOCS (sec, relocs, n);
resolve_symbol_value (symp);
}
resolve_local_symbol_values ();
+ resolve_reloc_expr_symbols ();
PROGRESS (1);
/* Do relax(). */
{
unsigned long max_iterations;
- offsetT stretch; /* May be any size, 0 or negative. */
- /* Cumulative number of addresses we have relaxed this pass.
- We may have relaxed more than one address. */
- int stretched; /* Have we stretched on this pass? */
- /* This is 'cuz stretch may be zero, when, in fact some piece of code
- grew, and another shrank. If a branch instruction doesn't fit anymore,
- we could be scrod. */
+
+ /* Cumulative address adjustment. */
+ offsetT stretch;
+
+ /* Have we made any adjustment this pass? We can't just test
+ stretch because one piece of code may have grown and another
+ shrank. */
+ int stretched;
+
+ /* Most horrible, but gcc may give us some exception data that
+ is impossible to assemble, of the form
+
+ .align 4
+ .byte 0, 0
+ .uleb128 end - start
+ start:
+ .space 128*128 - 1
+ .align 4
+ end:
+
+ If the leb128 is two bytes in size, then end-start is 128*128,
+ which requires a three byte leb128. If the leb128 is three
+ bytes in size, then end-start is 128*128-1, which requires a
+ two byte leb128. We work around this dilemma by inserting
+ an extra 4 bytes of alignment just after the .align. This
+ works because the data after the align is accessed relative to
+ the end label.
+
+ This counter is used in a tiny state machine to detect
+ whether a leb128 followed by an align is impossible to
+ relax. */
+ int rs_leb128_fudge = 0;
/* We want to prevent going into an infinite loop where one frag grows
depending upon the location of a symbol which is in turn moved by
}
growth = newoff - oldoff;
+
+ /* If this align happens to follow a leb128 and
+ we have determined that the leb128 is bouncing
+ in size, then break the cycle by inserting an
+ extra alignment. */
+ if (growth < 0
+ && (rs_leb128_fudge & 16) != 0
+ && (rs_leb128_fudge & 15) >= 2)
+ {
+ segment_info_type *seginfo = seg_info (segment);
+ struct obstack *ob = &seginfo->frchainP->frch_obstack;
+ struct frag *newf;
+
+ newf = frag_alloc (ob);
+ obstack_blank_fast (ob, fragP->fr_var);
+ obstack_finish (ob);
+ memcpy (newf, fragP, SIZEOF_STRUCT_FRAG);
+ memcpy (newf->fr_literal,
+ fragP->fr_literal + fragP->fr_fix,
+ fragP->fr_var);
+ newf->fr_type = rs_fill;
+ newf->fr_fix = 0;
+ newf->fr_offset = (((offsetT) 1 << fragP->fr_offset)
+ / fragP->fr_var);
+ if (newf->fr_offset * newf->fr_var
+ != (offsetT) 1 << fragP->fr_offset)
+ {
+ newf->fr_offset = (offsetT) 1 << fragP->fr_offset;
+ newf->fr_var = 1;
+ }
+ /* Include growth of new frag, because rs_fill
+ frags don't normally grow. */
+ growth += newf->fr_offset * newf->fr_var;
+ /* The new frag address is newoff. Adjust this
+ for the amount we'll add when we process the
+ new frag. */
+ newf->fr_address = newoff - stretch - growth;
+ newf->relax_marker ^= 1;
+ fragP->fr_next = newf;
+#ifdef DEBUG
+ as_warn (_("padding added"));
+#endif
+ }
}
break;
{
stretch += growth;
stretched = 1;
+ if (fragP->fr_type == rs_leb128)
+ rs_leb128_fudge += 16;
+ else if (fragP->fr_type == rs_align
+ && (rs_leb128_fudge & 16) != 0
+ && stretch == 0)
+ rs_leb128_fudge += 16;
+ else
+ rs_leb128_fudge = 0;
}
}
+
+ if (stretch == 0
+ && (rs_leb128_fudge & 16) == 0
+ && (rs_leb128_fudge & -16) != 0)
+ rs_leb128_fudge += 1;
+ else
+ rs_leb128_fudge = 0;
}
/* Until nothing further to relax. */
while (stretched && -- max_iterations);