/* 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
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
(! SEG_NORMAL (SEG))
#endif
+#ifndef md_register_arithmetic
+# define md_register_arithmetic 1
+#endif
+
#ifndef TC_FORCE_RELOCATION_SUB_ABS
-#define TC_FORCE_RELOCATION_SUB_ABS(FIX) 0
+#define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \
+ (!md_register_arithmetic && (SEG) == reg_section)
#endif
#ifndef TC_FORCE_RELOCATION_SUB_LOCAL
#ifdef DIFF_EXPR_OK
-#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0
+#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
+ (!md_register_arithmetic && (SEG) == reg_section)
#else
-#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1
+#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
#endif
#endif
#ifndef TC_VALIDATE_FIX_SUB
#ifdef UNDEFINED_DIFFERENCE_OK
/* The PA needs this for PIC code generation. */
-#define TC_VALIDATE_FIX_SUB(FIX) 1
+#define TC_VALIDATE_FIX_SUB(FIX, SEG) \
+ (md_register_arithmetic || (SEG) != reg_section)
#else
-#define TC_VALIDATE_FIX_SUB(FIX) \
- ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
- || (FIX)->fx_r_type == BFD_RELOC_GPREL16)
+#define TC_VALIDATE_FIX_SUB(FIX, SEG) \
+ ((md_register_arithmetic || (SEG) != reg_section) \
+ && ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \
+ || (FIX)->fx_r_type == BFD_RELOC_GPREL16))
#endif
#endif
#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
n_fixups++;
- fixP = obstack_alloc (¬es, sizeof (fixS));
+ fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
fixP->fx_frag = frag;
fixP->fx_where = where;
{
prev_frag->fr_next = frchp->frch_root;
prev_frag = frchp->frch_last;
- assert (prev_frag->fr_type != 0);
+ gas_assert (prev_frag->fr_type != 0);
if (frchp->fix_root != (fixS *) NULL)
{
if (seg_info (section)->fix_root == (fixS *) NULL)
prev_fix = frchp->fix_tail;
}
}
- assert (prev_frag->fr_type != 0);
- assert (prev_frag != &dummy);
+ gas_assert (prev_frag->fr_type != 0);
+ gas_assert (prev_frag != &dummy);
prev_frag->fr_next = 0;
return prev_frag;
}
case rs_machine_dependent:
md_convert_frag (stdoutput, sec, fragP);
- assert (fragP->fr_next == NULL
+ gas_assert (fragP->fr_next == NULL
|| ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address)
== fragP->fr_fix));
size = 0;
flags = bfd_get_section_flags (abfd, sec);
+ if (size == 0 && bfd_get_section_size (sec) != 0 &&
+ (flags & SEC_HAS_CONTENTS) != 0)
+ return;
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);
+ gas_assert (x);
newsize = md_section_align (sec, size);
x = bfd_set_section_size (abfd, sec, newsize);
- assert (x);
+ gas_assert (x);
/* If the size had to be rounded up, add some padding in the last
non-empty frag. */
- assert (newsize >= size);
+ gas_assert (newsize >= size);
if (size != newsize)
{
fragS *last = seginfo->frchainP->frch_last;
#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. */
/* If this symbol is equated to an undefined or common symbol,
convert the fixup to being against that symbol. */
- if (symbol_equated_reloc_p (sym)
- || S_IS_WEAKREFR (sym))
+ while (symbol_equated_reloc_p (sym)
+ || S_IS_WEAKREFR (sym))
{
+ symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol;
+ if (sym == newsym)
+ break;
fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
- sym = symbol_get_value_expression (sym)->X_add_symbol;
- fixp->fx_addsy = sym;
+ fixp->fx_addsy = newsym;
+ sym = newsym;
}
if (symbol_mri_common_p (sym))
{
- /* These symbols are handled specially in fixup_segment. */
+ fixp->fx_offset += S_GET_VALUE (sym);
+ fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol;
continue;
}
if (bfd_is_abs_section (symsec))
{
/* The fixup_segment routine normally will not use this
- symbol in a relocation. */
+ symbol in a relocation. */
continue;
}
/* Don't try to reduce relocs which refer to non-local symbols
- in .linkonce sections. It can lead to confusion when a
- debugging section refers to a .linkonce section. I hope
- this will always be correct. */
+ in .linkonce sections. It can lead to confusion when a
+ debugging section refers to a .linkonce section. I hope
+ this will always be correct. */
if (symsec != sec && ! S_IS_LOCAL (sym))
{
if ((symsec->flags & SEC_LINK_ONCE) != 0
#endif
add_number = fixP->fx_offset;
- if (fixP->fx_addsy != NULL
- && symbol_mri_common_p (fixP->fx_addsy))
- {
- add_number += S_GET_VALUE (fixP->fx_addsy);
- fixP->fx_offset = add_number;
- fixP->fx_addsy
- = symbol_get_value_expression (fixP->fx_addsy)->X_add_symbol;
- }
-
if (fixP->fx_addsy != NULL)
add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy);
#endif
}
else if (sub_symbol_segment == absolute_section
- && !TC_FORCE_RELOCATION_SUB_ABS (fixP))
+ && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
fixP->fx_offset = add_number;
fixP->fx_subsy = NULL;
}
else if (sub_symbol_segment == this_segment
- && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP))
+ && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP, add_symbol_segment))
{
add_number -= S_GET_VALUE (fixP->fx_subsy);
fixP->fx_offset = (add_number + fixP->fx_dot_value
fixP->fx_subsy = NULL;
fixP->fx_pcrel = 1;
}
- else if (!TC_VALIDATE_FIX_SUB (fixP))
+ else if (!TC_VALIDATE_FIX_SUB (fixP, add_symbol_segment))
{
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("can't resolve `%s' {%s section} - `%s' {%s section}"),
- fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
- segment_name (add_symbol_segment),
- S_GET_NAME (fixP->fx_subsy),
- segment_name (sub_symbol_segment));
+ if (!md_register_arithmetic
+ && (add_symbol_segment == reg_section
+ || sub_symbol_segment == reg_section))
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("register value used as expression"));
+ else
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("can't resolve `%s' {%s section} - `%s' {%s section}"),
+ fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0",
+ segment_name (add_symbol_segment),
+ S_GET_NAME (fixP->fx_subsy),
+ segment_name (sub_symbol_segment));
}
}
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;
+ asymbol *sym;
+
+ if (reloc->sym_ptr_ptr != NULL
+ && (sym = *reloc->sym_ptr_ptr) != NULL
+ && (sym->flags & BSF_KEEP) == 0
+ && ((sym->flags & BSF_SECTION_SYM) == 0
+ || (EMIT_SECTION_SYMBOLS
+ && !bfd_is_abs_section (sym->section))))
+ as_bad_where (file, line, _("redefined symbol cannot be used on reloc"));
+
+ 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;
- }
-
- /* If this is an undefined symbol which was equated to another
- symbol, then generate the reloc against the latter symbol
- rather than the former. */
- sym = fixp->fx_addsy;
- while (symbol_equated_reloc_p (sym))
+ if (r->u.b.sec == sec)
{
- symbolS *n;
-
- /* We must avoid looping, as that can occur with a badly
- written program. */
- n = symbol_get_value_expression (sym)->X_add_symbol;
- if (n == sym)
- break;
- fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
- sym = n;
- }
- fixp->fx_addsy = sym;
-
- reloc = tc_gen_reloc (sec, fixp);
- if (!reloc)
- {
- 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 *));
+
+ relocs = (arelent **) 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;
- }
+ continue;
- /* If this is an undefined symbol which was equated to another
- symbol, then generate the reloc against the latter symbol
- rather than the former. */
- sym = fixp->fx_addsy;
- while (symbol_equated_reloc_p (sym))
- {
- symbolS *n;
-
- /* We must avoid looping, as that can occur with a badly
- written program. */
- n = symbol_get_value_expression (sym)->X_add_symbol;
- if (n == sym)
- break;
- fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number;
- sym = n;
- }
- fixp->fx_addsy = sym;
+ 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"));
- reloc = tc_gen_reloc (sec, fixp);
+#ifndef RELOC_EXPANSION_POSSIBLE
+ {
+ arelent *reloc = tc_gen_reloc (sec, fixp);
- for (j = 0; reloc[j]; j++)
- {
+ 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];
- assert (i <= n);
- }
- if (fixp->fx_where + fixp->fx_size
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
- 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);
- }
- }
+ }
+#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);
char *fill_literal;
offsetT count;
- assert (f->fr_type == rs_fill);
+ gas_assert (f->fr_type == rs_fill);
if (f->fr_fix)
{
x = bfd_set_section_contents (stdoutput, sec,
fill_literal = f->fr_literal + f->fr_fix;
fill_size = f->fr_var;
count = f->fr_offset;
- assert (count >= 0);
+ gas_assert (count >= 0);
if (fill_size && count)
{
char buf[256];
int i;
bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *);
- asympp = bfd_alloc (stdoutput, amt);
+ asympp = (asymbol **) bfd_alloc (stdoutput, amt);
symp = symbol_rootP;
for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
{
asympp[i] = symbol_get_bfdsym (symp);
+ if (asympp[i]->flags != BSF_SECTION_SYM
+ || !(bfd_is_const_section (asympp[i]->section)
+ && asympp[i]->section->symbol == asympp[i]))
+ asympp[i]->flags |= BSF_KEEP;
symbol_mark_written (symp);
}
}
else
asympp = 0;
result = bfd_set_symtab (stdoutput, asympp, nsyms);
- assert (result);
+ gas_assert (result);
symbol_table_frozen = 1;
}
if (lie->added == 2)
continue;
/* Patch the jump table. */
- /* This is the offset from ??? to table_ptr+0. */
- to_addr = table_addr - S_GET_VALUE (lie->sub);
-#ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
- TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie);
-#endif
- md_number_to_chars (lie->word_goes_here, to_addr, 2);
- for (untruth = lie->next_broken_word;
+ for (untruth = (struct broken_word *) (fragP->fr_symbol);
untruth && untruth->dispfrag == fragP;
untruth = untruth->next_broken_word)
{
if (untruth->use_jump == lie)
- md_number_to_chars (untruth->word_goes_here, to_addr, 2);
+ {
+ /* This is the offset from ??? to table_ptr+0.
+ The target is the same for all users of this
+ md_long_jump, but the "sub" bases (and hence the
+ offsets) may be different. */
+ addressT to_word = table_addr - S_GET_VALUE (untruth->sub);
+#ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD
+ TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_word, untruth);
+#endif
+ md_number_to_chars (untruth->word_goes_here, to_word, 2);
+ }
}
/* Install the long jump. */
resolve_symbol_value (symp);
}
resolve_local_symbol_values ();
+ resolve_reloc_expr_symbols ();
PROGRESS (1);
resolve_symbol_value (symp);
/* Skip symbols which were equated to undefined or common
- symbols. */
+ symbols. */
if (symbol_equated_reloc_p (symp)
|| S_IS_WEAKREFR (symp))
{
as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"),
name, S_GET_NAME (e->X_add_symbol));
}
+ if (S_GET_SEGMENT (symp) == reg_section)
+ {
+ /* Report error only if we know the symbol name. */
+ if (S_GET_NAME (symp) != reg_section->name)
+ as_bad (_("can't make global register symbol `%s'"),
+ name);
+ }
symbol_remove (symp, &symbol_rootP, &symbol_lastP);
continue;
}
obj_adjust_symtab ();
#endif
+ /* Stop if there is an error. */
+ if (had_errors ())
+ return;
+
/* Now that all the sizes are known, and contents correct, we can
start writing to the file. */
set_symtab ();
#ifdef obj_frob_file
obj_frob_file ();
#endif
-
+#ifdef obj_coff_generate_pdata
+ obj_coff_generate_pdata ();
+#endif
bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
#ifdef tc_frob_file_after_relocs
/* 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
the growing frag. eg:
- foo = .
- .org foo+16
- foo = .
+ foo = .
+ .org foo+16
+ foo = .
- So we dictate that this algorithm can be at most O2. */
+ So we dictate that this algorithm can be at most O2. */
max_iterations = frag_count * frag_count;
/* Check for overflow. */
if (max_iterations < frag_count)
S_GET_NAME (lie->sub),
buf);
}
- lie->added = 1;
if (fragP->fr_subtype == 0)
{
fragP->fr_subtype++;
growth += md_short_jump_size;
}
- for (untruth = lie->next_broken_word;
+
+ /* Redirect *all* words of this table with the same
+ target, lest we have to handle the case where the
+ same target but with a offset that fits on this
+ round overflows at the next relaxation round. */
+ for (untruth = (struct broken_word *) (fragP->fr_symbol);
untruth && untruth->dispfrag == lie->dispfrag;
untruth = untruth->next_broken_word)
if ((symbol_get_frag (untruth->add)
untruth->added = 2;
untruth->use_jump = lie;
}
+
+ lie->added = 1;
growth += md_long_jump_size;
}
}
}
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;
if (symbolP)
{
- /* Convert from an actual address to an octet offset
- into the section. Here it is assumed that the
- section's VMA is zero, and can omit subtracting it
- from the symbol's value to get the address offset. */
- know (S_GET_SEGMENT (symbolP)->vma == 0);
+ /* Convert from an actual address to an octet offset
+ into the section. Here it is assumed that the
+ section's VMA is zero, and can omit subtracting it
+ from the symbol's value to get the address offset. */
+ know (S_GET_SEGMENT (symbolP)->vma == 0);
target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE;
}
know (fragP->fr_next);
- after = fragP->fr_next->fr_address;
+ after = fragP->fr_next->fr_address + stretch;
growth = target - after;
if (growth < 0)
{
_("attempt to move .org backwards"));
/* We've issued an error message. Change the
- frag to avoid cascading errors. */
+ frag to avoid cascading errors. */
fragP->fr_type = rs_align;
fragP->fr_subtype = 0;
fragP->fr_offset = 0;
- fragP->fr_fix = after - was_address;
- break;
+ fragP->fr_fix = after - address;
}
-
- /* This is an absolute growth factor */
- growth -= stretch;
- break;
}
+ break;
case rs_space:
growth = 0;
{
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);
print_fixup (fixS *fixp)
{
indent_level = 1;
- fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
+ fprintf (stderr, "fix ");
+ fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp));
+ fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line);
if (fixp->fx_pcrel)
fprintf (stderr, " pcrel");
if (fixp->fx_pcrel_adjust)
fprintf (stderr, " tcbit");
if (fixp->fx_done)
fprintf (stderr, " done");
- fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
- fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
- (long) fixp->fx_offset, (long) fixp->fx_addnumber);
+ fprintf (stderr, "\n size=%d frag=", fixp->fx_size);
+ fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag));
+ fprintf (stderr, " where=%ld offset=%lx addnumber=%lx",
+ (long) fixp->fx_where,
+ (unsigned long) fixp->fx_offset,
+ (unsigned long) fixp->fx_addnumber);
fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
fixp->fx_r_type);
if (fixp->fx_addsy)
projects / deliverable / binutils-gdb.git / blobdiff