/* ldwrite.c -- write out the linked file
- Copyright (C) 1993 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2002,
+ 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
Written by Steve Chamberlain sac@cygnus.com
-This file is part of GLD, the Gnu Linker.
+ This file is part of the GNU Binutils.
-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 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 3 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.
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "bfdlink.h"
+#include "libiberty.h"
+#include "safe-ctype.h"
#include "ld.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldwrite.h"
#include "ldmisc.h"
-#include "ldgram.h"
+#include <ldgram.h>
#include "ldmain.h"
-static void build_link_order PARAMS ((lang_statement_union_type *));
-static void print_symbol_table PARAMS ((void));
-static void print_file_stuff PARAMS ((lang_input_statement_type *));
-static boolean print_symbol PARAMS ((struct bfd_link_hash_entry *, PTR));
-
/* Build link_order structures for the BFD linker. */
static void
-build_link_order (statement)
- lang_statement_union_type *statement;
+build_link_order (lang_statement_union_type *statement)
{
switch (statement->header.type)
{
case lang_data_statement_enum:
- /* FIXME: This should probably build a link_order, but instead
- it just does the output directly. */
{
- bfd_vma value = statement->data_statement.value;
- bfd_byte play_area[QUAD_SIZE];
- unsigned int size = 0;
- asection *output_section = statement->data_statement.output_section;
+ asection *output_section;
+ struct bfd_link_order *link_order;
+ bfd_vma value;
+ bfd_boolean big_endian = FALSE;
+
+ output_section = statement->data_statement.output_section;
+ ASSERT (output_section->owner == link_info.output_bfd);
+
+ link_order = bfd_new_link_order (link_info.output_bfd, output_section);
+ if (link_order == NULL)
+ einfo (_("%P%F: bfd_new_link_order failed\n"));
+
+ link_order->type = bfd_data_link_order;
+ link_order->offset = statement->data_statement.output_offset;
+ link_order->u.data.contents = xmalloc (QUAD_SIZE);
+
+ value = statement->data_statement.value;
+
+ /* If the endianness of the output BFD is not known, then we
+ base the endianness of the data on the first input file.
+ By convention, the bfd_put routines for an unknown
+ endianness are big endian, so we must swap here if the
+ input file is little endian. */
+ if (bfd_big_endian (link_info.output_bfd))
+ big_endian = TRUE;
+ else if (bfd_little_endian (link_info.output_bfd))
+ big_endian = FALSE;
+ else
+ {
+ bfd_boolean swap;
+
+ swap = FALSE;
+ if (command_line.endian == ENDIAN_BIG)
+ big_endian = TRUE;
+ else if (command_line.endian == ENDIAN_LITTLE)
+ {
+ big_endian = FALSE;
+ swap = TRUE;
+ }
+ else if (command_line.endian == ENDIAN_UNSET)
+ {
+ big_endian = TRUE;
+ {
+ LANG_FOR_EACH_INPUT_STATEMENT (s)
+ {
+ if (s->the_bfd != NULL)
+ {
+ if (bfd_little_endian (s->the_bfd))
+ {
+ big_endian = FALSE;
+ swap = TRUE;
+ }
+ break;
+ }
+ }
+ }
+ }
+
+ if (swap)
+ {
+ bfd_byte buffer[8];
+
+ switch (statement->data_statement.type)
+ {
+ case QUAD:
+ case SQUAD:
+ if (sizeof (bfd_vma) >= QUAD_SIZE)
+ {
+ bfd_putl64 (value, buffer);
+ value = bfd_getb64 (buffer);
+ break;
+ }
+ /* Fall through. */
+ case LONG:
+ bfd_putl32 (value, buffer);
+ value = bfd_getb32 (buffer);
+ break;
+ case SHORT:
+ bfd_putl16 (value, buffer);
+ value = bfd_getb16 (buffer);
+ break;
+ case BYTE:
+ break;
+ default:
+ abort ();
+ }
+ }
+ }
- ASSERT (output_section->owner == output_bfd);
+ ASSERT (output_section->owner == link_info.output_bfd);
switch (statement->data_statement.type)
{
case QUAD:
- bfd_put_64 (output_bfd, value, play_area);
- size = QUAD_SIZE;
+ case SQUAD:
+ if (sizeof (bfd_vma) >= QUAD_SIZE)
+ bfd_put_64 (link_info.output_bfd, value,
+ link_order->u.data.contents);
+ else
+ {
+ bfd_vma high;
+
+ if (statement->data_statement.type == QUAD)
+ high = 0;
+ else if ((value & 0x80000000) == 0)
+ high = 0;
+ else
+ high = (bfd_vma) -1;
+ bfd_put_32 (link_info.output_bfd, high,
+ (link_order->u.data.contents
+ + (big_endian ? 0 : 4)));
+ bfd_put_32 (link_info.output_bfd, value,
+ (link_order->u.data.contents
+ + (big_endian ? 4 : 0)));
+ }
+ link_order->size = QUAD_SIZE;
break;
case LONG:
- bfd_put_32 (output_bfd, value, play_area);
- size = LONG_SIZE;
+ bfd_put_32 (link_info.output_bfd, value,
+ link_order->u.data.contents);
+ link_order->size = LONG_SIZE;
break;
case SHORT:
- bfd_put_16 (output_bfd, value, play_area);
- size = SHORT_SIZE;
+ bfd_put_16 (link_info.output_bfd, value,
+ link_order->u.data.contents);
+ link_order->size = SHORT_SIZE;
break;
case BYTE:
- bfd_put_8 (output_bfd, value, play_area);
- size = BYTE_SIZE;
+ bfd_put_8 (link_info.output_bfd, value,
+ link_order->u.data.contents);
+ link_order->size = BYTE_SIZE;
break;
default:
abort ();
}
-
- if (! bfd_set_section_contents (output_bfd, output_section,
- play_area,
- statement->data_statement.output_vma,
- size))
- einfo ("%P%X: writing data failed: %E\n");
}
break;
rs = &statement->reloc_statement;
output_section = rs->output_section;
- ASSERT (output_section->owner == output_bfd);
+ ASSERT (output_section->owner == link_info.output_bfd);
- link_order = bfd_new_link_order (output_bfd, output_section);
+ link_order = bfd_new_link_order (link_info.output_bfd, output_section);
if (link_order == NULL)
- einfo ("%P%F: bfd_new_link_order failed");
+ einfo (_("%P%F: bfd_new_link_order failed\n"));
- link_order->offset = rs->output_vma;
+ link_order->offset = rs->output_offset;
link_order->size = bfd_get_reloc_size (rs->howto);
- link_order->u.reloc.p =
- ((struct bfd_link_order_reloc *)
- xmalloc (sizeof (struct bfd_link_order_reloc)));
+ link_order->u.reloc.p = xmalloc (sizeof (struct bfd_link_order_reloc));
link_order->u.reloc.p->reloc = rs->reloc;
link_order->u.reloc.p->addend = rs->addend_value;
- if (rs->section != (asection *) NULL)
+ if (rs->name == NULL)
{
- ASSERT (rs->name == (const char *) NULL);
link_order->type = bfd_section_reloc_link_order;
- if (rs->section->owner == output_bfd)
+ if (rs->section->owner == link_info.output_bfd)
link_order->u.reloc.p->u.section = rs->section;
else
{
}
else
{
- ASSERT (rs->name != (const char *) NULL);
link_order->type = bfd_symbol_reloc_link_order;
link_order->u.reloc.p->u.name = rs->name;
}
break;
case lang_input_section_enum:
- /* Create a new link_order in the output section with this
- attached */
- if (statement->input_section.ifile->just_syms_flag == false)
- {
- asection *i = statement->input_section.section;
- asection *output_section = i->output_section;
-
- ASSERT (output_section->owner == output_bfd);
+ {
+ /* Create a new link_order in the output section with this
+ attached */
+ asection *i = statement->input_section.section;
- if ((output_section->flags & SEC_HAS_CONTENTS) != 0)
- {
- struct bfd_link_order *link_order;
+ if (!((lang_input_statement_type *) i->owner->usrdata)->just_syms_flag
+ && (i->flags & SEC_EXCLUDE) == 0)
+ {
+ asection *output_section = i->output_section;
- link_order = bfd_new_link_order (output_bfd, output_section);
+ ASSERT (output_section->owner == link_info.output_bfd);
- if (i->flags & SEC_NEVER_LOAD)
- {
- /* We've got a never load section inside one which
- is going to be output, we'll change it into a
- fill link_order */
- link_order->type = bfd_fill_link_order;
- link_order->u.fill.value = 0;
- }
- else
- {
- link_order->type = bfd_indirect_link_order;
- link_order->u.indirect.section = i;
- ASSERT (i->output_section == output_section);
- }
- if (i->_cooked_size)
- link_order->size = i->_cooked_size;
- else
- link_order->size = bfd_get_section_size_before_reloc (i);
- link_order->offset = i->output_offset;
- }
- }
+ if ((output_section->flags & SEC_HAS_CONTENTS) != 0
+ || ((output_section->flags & SEC_LOAD) != 0
+ && (output_section->flags & SEC_THREAD_LOCAL)))
+ {
+ struct bfd_link_order *link_order;
+
+ link_order = bfd_new_link_order (link_info.output_bfd,
+ output_section);
+
+ if (i->flags & SEC_NEVER_LOAD)
+ {
+ /* We've got a never load section inside one which
+ is going to be output, we'll change it into a
+ fill. */
+ link_order->type = bfd_data_link_order;
+ link_order->u.data.contents = (unsigned char *) "";
+ link_order->u.data.size = 1;
+ }
+ else
+ {
+ link_order->type = bfd_indirect_link_order;
+ link_order->u.indirect.section = i;
+ ASSERT (i->output_section == output_section);
+ }
+ link_order->size = i->size;
+ link_order->offset = i->output_offset;
+ }
+ }
+ }
break;
case lang_padding_statement_enum:
output_section = statement->padding_statement.output_section;
ASSERT (statement->padding_statement.output_section->owner
- == output_bfd);
- if ((output_section->flags & SEC_HAS_CONTENTS) != 0)
+ == link_info.output_bfd);
+ if (((output_section->flags & SEC_HAS_CONTENTS) != 0
+ || ((output_section->flags & SEC_LOAD) != 0
+ && (output_section->flags & SEC_THREAD_LOCAL)))
+ && (output_section->flags & SEC_NEVER_LOAD) == 0)
{
- link_order = bfd_new_link_order (output_bfd, output_section);
- link_order->type = bfd_fill_link_order;
+ link_order = bfd_new_link_order (link_info.output_bfd,
+ output_section);
+ link_order->type = bfd_data_link_order;
link_order->size = statement->padding_statement.size;
link_order->offset = statement->padding_statement.output_offset;
- link_order->u.fill.value = statement->padding_statement.fill;
+ link_order->u.data.contents = statement->padding_statement.fill->data;
+ link_order->u.data.size = statement->padding_statement.fill->size;
}
}
break;
}
}
-/* Call BFD to write out the linked file. */
+/* Return true if NAME is the name of an unsplittable section. These
+ are the stabs strings, dwarf strings. */
-void
-ldwrite ()
+static bfd_boolean
+unsplittable_name (const char *name)
{
- lang_for_each_statement (build_link_order);
-
- if (! bfd_final_link (output_bfd, &link_info))
- einfo ("%F%P: final link failed: %E\n", output_bfd);
-
- if (config.map_file)
+ if (CONST_STRNEQ (name, ".stab"))
{
- print_symbol_table ();
- lang_map ();
+ /* There are several stab like string sections. We pattern match on
+ ".stab...str" */
+ unsigned len = strlen (name);
+ if (strcmp (&name[len-3], "str") == 0)
+ return TRUE;
}
+ else if (strcmp (name, "$GDB_STRINGS$") == 0)
+ return TRUE;
+ return FALSE;
}
-/* Print the symbol table. */
+/* Wander around the input sections, make sure that
+ we'll never try and create an output section with more relocs
+ than will fit.. Do this by always assuming the worst case, and
+ creating new output sections with all the right bits. */
+#define TESTIT 1
+static asection *
+clone_section (bfd *abfd, asection *s, const char *name, int *count)
+{
+ char *tname;
+ char *sname;
+ unsigned int len;
+ asection *n;
+ struct bfd_link_hash_entry *h;
+
+ /* Invent a section name from the section name and a dotted numeric
+ suffix. */
+ len = strlen (name);
+ tname = xmalloc (len + 1);
+ memcpy (tname, name, len + 1);
+ /* Remove a dotted number suffix, from a previous split link. */
+ while (len && ISDIGIT (tname[len-1]))
+ len--;
+ if (len > 1 && tname[len-1] == '.')
+ /* It was a dotted number. */
+ tname[len-1] = 0;
+
+ /* We want to use the whole of the original section name for the
+ split name, but coff can be restricted to 8 character names. */
+ if (bfd_family_coff (abfd) && strlen (tname) > 5)
+ {
+ /* Some section names cannot be truncated, as the name is
+ used to locate some other section. */
+ if (CONST_STRNEQ (name, ".stab")
+ || strcmp (name, "$GDB_SYMBOLS$") == 0)
+ {
+ einfo (_ ("%F%P: cannot create split section name for %s\n"), name);
+ /* Silence gcc warnings. einfo exits, so we never reach here. */
+ return NULL;
+ }
+ tname[5] = 0;
+ }
+
+ if ((sname = bfd_get_unique_section_name (abfd, tname, count)) == NULL
+ || (n = bfd_make_section_anyway (abfd, sname)) == NULL
+ || (h = bfd_link_hash_lookup (link_info.hash,
+ sname, TRUE, TRUE, FALSE)) == NULL)
+ {
+ einfo (_("%F%P: clone section failed: %E\n"));
+ /* Silence gcc warnings. einfo exits, so we never reach here. */
+ return NULL;
+ }
+ free (tname);
+
+ /* Set up section symbol. */
+ h->type = bfd_link_hash_defined;
+ h->u.def.value = 0;
+ h->u.def.section = n;
+
+ n->flags = s->flags;
+ n->vma = s->vma;
+ n->user_set_vma = s->user_set_vma;
+ n->lma = s->lma;
+ n->size = 0;
+ n->output_offset = s->output_offset;
+ n->output_section = n;
+ n->orelocation = 0;
+ n->reloc_count = 0;
+ n->alignment_power = s->alignment_power;
+ return n;
+}
+#if TESTING
static void
-print_symbol_table ()
+ds (asection *s)
{
- fprintf (config.map_file, "**FILES**\n\n");
- lang_for_each_file (print_file_stuff);
-
- fprintf (config.map_file, "**GLOBAL SYMBOLS**\n\n");
- fprintf (config.map_file, "offset section offset symbol\n");
- bfd_link_hash_traverse (link_info.hash, print_symbol, (PTR) NULL);
+ struct bfd_link_order *l = s->map_head.link_order;
+ printf ("vma %x size %x\n", s->vma, s->size);
+ while (l)
+ {
+ if (l->type == bfd_indirect_link_order)
+ {
+ printf ("%8x %s\n", l->offset, l->u.indirect.section->owner->filename);
+ }
+ else
+ {
+ printf (_("%8x something else\n"), l->offset);
+ }
+ l = l->next;
+ }
+ printf ("\n");
}
-/* Print information about a file. */
+dump (char *s, asection *a1, asection *a2)
+{
+ printf ("%s\n", s);
+ ds (a1);
+ ds (a2);
+}
static void
-print_file_stuff (f)
- lang_input_statement_type * f;
+sanity_check (bfd *abfd)
{
- fprintf (config.map_file, " %s\n", f->filename);
- if (f->just_syms_flag)
+ asection *s;
+ for (s = abfd->sections; s; s = s->next)
{
- fprintf (config.map_file, " symbols only\n");
+ struct bfd_link_order *p;
+ bfd_vma prev = 0;
+ for (p = s->map_head.link_order; p; p = p->next)
+ {
+ if (p->offset > 100000)
+ abort ();
+ if (p->offset < prev)
+ abort ();
+ prev = p->offset;
+ }
}
- else
+}
+#else
+#define sanity_check(a)
+#define dump(a, b, c)
+#endif
+
+static void
+split_sections (bfd *abfd, struct bfd_link_info *info)
+{
+ asection *original_sec;
+ int nsecs = abfd->section_count;
+ sanity_check (abfd);
+ /* Look through all the original sections. */
+ for (original_sec = abfd->sections;
+ original_sec && nsecs;
+ original_sec = original_sec->next, nsecs--)
{
- asection *s;
- if (true)
+ int count = 0;
+ unsigned int lines = 0;
+ unsigned int relocs = 0;
+ bfd_size_type sec_size = 0;
+ struct bfd_link_order *l;
+ struct bfd_link_order *p;
+ bfd_vma vma = original_sec->vma;
+ asection *cursor = original_sec;
+
+ /* Count up the relocations and line entries to see if anything
+ would be too big to fit. Accumulate section size too. */
+ for (l = NULL, p = cursor->map_head.link_order; p != NULL; p = l->next)
{
- for (s = f->the_bfd->sections;
- s != (asection *) NULL;
- s = s->next)
+ unsigned int thislines = 0;
+ unsigned int thisrelocs = 0;
+ bfd_size_type thissize = 0;
+ if (p->type == bfd_indirect_link_order)
{
- print_address (s->output_offset);
- if (s->reloc_done)
- {
- fprintf (config.map_file, " %08x 2**%2ud %s\n",
- (unsigned) bfd_get_section_size_after_reloc (s),
- s->alignment_power, s->name);
- }
+ asection *sec;
+
+ sec = p->u.indirect.section;
+
+ if (info->strip == strip_none
+ || info->strip == strip_some)
+ thislines = sec->lineno_count;
+
+ if (info->relocatable)
+ thisrelocs = sec->reloc_count;
+
+ thissize = sec->size;
+
+ }
+ else if (info->relocatable
+ && (p->type == bfd_section_reloc_link_order
+ || p->type == bfd_symbol_reloc_link_order))
+ thisrelocs++;
+
+ if (l != NULL
+ && (thisrelocs + relocs >= config.split_by_reloc
+ || thislines + lines >= config.split_by_reloc
+ || (thissize + sec_size >= config.split_by_file))
+ && !unsplittable_name (cursor->name))
+ {
+ /* Create a new section and put this link order and the
+ following link orders into it. */
+ bfd_vma shift_offset;
+ asection *n;
+
+ n = clone_section (abfd, cursor, original_sec->name, &count);
+
+ /* Attach the link orders to the new section and snip
+ them off from the old section. */
+ n->map_head.link_order = p;
+ n->map_tail.link_order = cursor->map_tail.link_order;
+ cursor->map_tail.link_order = l;
+ l->next = NULL;
+ l = p;
+
+ /* Change the size of the original section and
+ update the vma of the new one. */
+
+ dump ("before snip", cursor, n);
- else
+ shift_offset = p->offset;
+ n->size = cursor->size - shift_offset;
+ cursor->size = shift_offset;
+
+ vma += shift_offset;
+ n->lma = n->vma = vma;
+
+ /* Run down the chain and change the output section to
+ the right one, update the offsets too. */
+ do
{
- fprintf (config.map_file, " %08x 2**%2ud %s\n",
- (unsigned) bfd_get_section_size_before_reloc (s),
- s->alignment_power, s->name);
+ p->offset -= shift_offset;
+ if (p->type == bfd_indirect_link_order)
+ {
+ p->u.indirect.section->output_section = n;
+ p->u.indirect.section->output_offset = p->offset;
+ }
+ p = p->next;
}
+ while (p);
+
+ dump ("after snip", cursor, n);
+ cursor = n;
+ relocs = thisrelocs;
+ lines = thislines;
+ sec_size = thissize;
}
- }
- else
- {
- for (s = f->the_bfd->sections;
- s != (asection *) NULL;
- s = s->next)
+ else
{
- fprintf (config.map_file, "%s ", s->name);
- print_address (s->output_offset);
- fprintf (config.map_file, "(%x)",
- (unsigned) bfd_get_section_size_after_reloc (s));
+ l = p;
+ relocs += thisrelocs;
+ lines += thislines;
+ sec_size += thissize;
}
- fprintf (config.map_file, "hex \n");
}
}
- print_nl ();
+ sanity_check (abfd);
}
-/* Print a symbol. */
+/* Call BFD to write out the linked file. */
-/*ARGSUSED*/
-static boolean
-print_symbol (p, ignore)
- struct bfd_link_hash_entry *p;
- PTR ignore;
+void
+ldwrite (void)
{
- while (p->type == bfd_link_hash_indirect
- || p->type == bfd_link_hash_warning)
- p = p->u.i.link;
+ /* Reset error indicator, which can typically something like invalid
+ format from opening up the .o files. */
+ bfd_set_error (bfd_error_no_error);
+ lang_for_each_statement (build_link_order);
- switch (p->type)
+ if (config.split_by_reloc != (unsigned) -1
+ || config.split_by_file != (bfd_size_type) -1)
+ split_sections (link_info.output_bfd, &link_info);
+ if (!bfd_final_link (link_info.output_bfd, &link_info))
{
- case bfd_link_hash_new:
- abort ();
-
- case bfd_link_hash_undefined:
- fprintf (config.map_file, "undefined ");
- fprintf (config.map_file, "%s ", p->root.string);
- print_nl ();
- break;
-
- case bfd_link_hash_weak:
- fprintf (config.map_file, "weak ");
- fprintf (config.map_file, "%s ", p->root.string);
- print_nl ();
- break;
-
- case bfd_link_hash_defined:
- {
- asection *defsec = p->u.def.section;
-
- print_address (p->u.def.value);
- if (defsec)
- {
- fprintf (config.map_file, " %-10s",
- bfd_section_name (output_bfd, defsec));
- print_space ();
- print_address (p->u.def.value + defsec->vma);
- }
- else
- {
- fprintf (config.map_file, " .......");
- }
- fprintf (config.map_file, " %s ", p->root.string);
- }
- print_nl ();
- break;
-
- case bfd_link_hash_common:
- fprintf (config.map_file, "common ");
- print_address (p->u.c.size);
- fprintf (config.map_file, " %s ", p->root.string);
- print_nl ();
- break;
+ /* If there was an error recorded, print it out. Otherwise assume
+ an appropriate error message like unknown symbol was printed
+ out. */
- default:
- abort ();
+ if (bfd_get_error () != bfd_error_no_error)
+ einfo (_("%F%P: final link failed: %E\n"));
+ else
+ xexit (1);
}
-
- return true;
}
projects / external / binutils.git / blobdiff