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binutils-gdb/bfd/cofflink.c
Tamar Christina 74edb473c9 PE/Windows x86_64: Fix weak undef symbols after image base change 
The change in PR19011 changed the image load address from being in the lower
32-bit address space to the higher 64-bit address space.

However when you have a weak undef symbol which stays undef at the end of
linking the linker has to resolve this (Windows loader does not support undef
symbols).  As such typically these would resolve to 0.

The relocation used for these weak symbols are the normal 32-bit PC_REL call
relocs.  So when doing the overflow check LD checks if the distance between the
symbol and the call is within range.  However now that the load address is
> 32-bits and the symbol val is 0 this overflow check will always fail.

As such the linker gives a bogus error.  This patch makes the linker not emit
the overflow failure but chooses to still let the check be performed (as it's
mid-end code).

One down side of this is that it does break the common convention that the call
be to sym at 0x0. i.e. before you'd get

      401015:   74 05                   je     40101c
      401017:   e8 e4 ef bf ff          callq  0

and now you get

   140001015:   74 05                   je     14000101c
   140001017:   e8 e4 ef ff bf          call   100000000

since the call is PC_REL there's no way to get the range large enough to
resolve to 0.  As such I have chosen to leave it as the furthest simple range
that we can still represent.

By only ignoring the error we leave the symbol value itself to still be 0
such that the if(<symbol>) checks still work correctly.

bfd/ChangeLog:

2021-04-01  Tamar Christina  <tamar.christina@arm.com>

	PR ld/26659
	* cofflink.c (_bfd_coff_generic_relocate_section): Ignore overflow.

ld/ChangeLog:

2021-04-01  Tamar Christina  <tamar.christina@arm.com>

	PR ld/26659
	* testsuite/ld-pe/pe.exp: Add test.
	* testsuite/ld-pe/pr26659-weak-undef-sym.d: New test.
	* testsuite/ld-pe/pr26659-weak-undef-sym.s: New test.
2021-04-01 17:54:04 +01:00

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/* COFF specific linker code.
Copyright (C) 1994-2021 Free Software Foundation, Inc.
Written by Ian Lance Taylor, Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
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.
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. */
/* This file contains the COFF backend linker code. */
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "safe-ctype.h"
static bool coff_link_add_object_symbols (bfd *, struct bfd_link_info *);
static bool coff_link_check_archive_element
(bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
bool *);
static bool coff_link_add_symbols (bfd *, struct bfd_link_info *);
/* Return TRUE if SYM is a weak, external symbol. */
#define IS_WEAK_EXTERNAL(abfd, sym) \
((sym).n_sclass == C_WEAKEXT \
|| (obj_pe (abfd) && (sym).n_sclass == C_NT_WEAK))
/* Return TRUE if SYM is an external symbol. */
#define IS_EXTERNAL(abfd, sym) \
((sym).n_sclass == C_EXT || IS_WEAK_EXTERNAL (abfd, sym))
/* Define macros so that the ISFCN, et. al., macros work correctly.
These macros are defined in include/coff/internal.h in terms of
N_TMASK, etc. These definitions require a user to define local
variables with the appropriate names, and with values from the
coff_data (abfd) structure. */
#define N_TMASK n_tmask
#define N_BTSHFT n_btshft
#define N_BTMASK n_btmask
/* Create an entry in a COFF linker hash table. */
struct bfd_hash_entry *
_bfd_coff_link_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
struct coff_link_hash_entry *ret = (struct coff_link_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == (struct coff_link_hash_entry *) NULL)
ret = ((struct coff_link_hash_entry *)
bfd_hash_allocate (table, sizeof (struct coff_link_hash_entry)));
if (ret == (struct coff_link_hash_entry *) NULL)
return (struct bfd_hash_entry *) ret;
/* Call the allocation method of the superclass. */
ret = ((struct coff_link_hash_entry *)
_bfd_link_hash_newfunc ((struct bfd_hash_entry *) ret,
table, string));
if (ret != (struct coff_link_hash_entry *) NULL)
{
/* Set local fields. */
ret->indx = -1;
ret->type = T_NULL;
ret->symbol_class = C_NULL;
ret->numaux = 0;
ret->auxbfd = NULL;
ret->aux = NULL;
}
return (struct bfd_hash_entry *) ret;
}
/* Initialize a COFF linker hash table. */
bool
_bfd_coff_link_hash_table_init (struct coff_link_hash_table *table,
bfd *abfd,
struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
struct bfd_hash_table *,
const char *),
unsigned int entsize)
{
memset (&table->stab_info, 0, sizeof (table->stab_info));
return _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
}
/* Create a COFF linker hash table. */
struct bfd_link_hash_table *
_bfd_coff_link_hash_table_create (bfd *abfd)
{
struct coff_link_hash_table *ret;
size_t amt = sizeof (struct coff_link_hash_table);
ret = (struct coff_link_hash_table *) bfd_malloc (amt);
if (ret == NULL)
return NULL;
if (! _bfd_coff_link_hash_table_init (ret, abfd,
_bfd_coff_link_hash_newfunc,
sizeof (struct coff_link_hash_entry)))
{
free (ret);
return (struct bfd_link_hash_table *) NULL;
}
return &ret->root;
}
/* Create an entry in a COFF debug merge hash table. */
struct bfd_hash_entry *
_bfd_coff_debug_merge_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
struct coff_debug_merge_hash_entry *ret =
(struct coff_debug_merge_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == (struct coff_debug_merge_hash_entry *) NULL)
ret = ((struct coff_debug_merge_hash_entry *)
bfd_hash_allocate (table,
sizeof (struct coff_debug_merge_hash_entry)));
if (ret == (struct coff_debug_merge_hash_entry *) NULL)
return (struct bfd_hash_entry *) ret;
/* Call the allocation method of the superclass. */
ret = ((struct coff_debug_merge_hash_entry *)
bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
if (ret != (struct coff_debug_merge_hash_entry *) NULL)
{
/* Set local fields. */
ret->types = NULL;
}
return (struct bfd_hash_entry *) ret;
}
/* Given a COFF BFD, add symbols to the global hash table as
appropriate. */
bool
_bfd_coff_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
{
switch (bfd_get_format (abfd))
{
case bfd_object:
return coff_link_add_object_symbols (abfd, info);
case bfd_archive:
return _bfd_generic_link_add_archive_symbols
(abfd, info, coff_link_check_archive_element);
default:
bfd_set_error (bfd_error_wrong_format);
return false;
}
}
/* Add symbols from a COFF object file. */
static bool
coff_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
{
if (! _bfd_coff_get_external_symbols (abfd))
return false;
if (! coff_link_add_symbols (abfd, info))
return false;
if (! info->keep_memory
&& ! _bfd_coff_free_symbols (abfd))
return false;
return true;
}
/* Check a single archive element to see if we need to include it in
the link. *PNEEDED is set according to whether this element is
needed in the link or not. This is called via
_bfd_generic_link_add_archive_symbols. */
static bool
coff_link_check_archive_element (bfd *abfd,
struct bfd_link_info *info,
struct bfd_link_hash_entry *h,
const char *name,
bool *pneeded)
{
*pneeded = false;
/* PR 22369 - Skip non COFF objects in the archive. */
if (! bfd_family_coff (abfd))
return true;
/* We are only interested in symbols that are currently undefined.
If a symbol is currently known to be common, COFF linkers do not
bring in an object file which defines it. */
if (h->type != bfd_link_hash_undefined)
return true;
/* If the archive element has already been loaded then one
of the symbols defined by that element might have been
made undefined due to being in a discarded section. */
if (((struct coff_link_hash_entry *) h)->indx == -3)
return true;
/* Include this element? */
if (!(*info->callbacks->add_archive_element) (info, abfd, name, &abfd))
return true;
*pneeded = true;
return bfd_link_add_symbols (abfd, info);
}
/* Add all the symbols from an object file to the hash table. */
static bool
coff_link_add_symbols (bfd *abfd,
struct bfd_link_info *info)
{
unsigned int n_tmask = coff_data (abfd)->local_n_tmask;
unsigned int n_btshft = coff_data (abfd)->local_n_btshft;
unsigned int n_btmask = coff_data (abfd)->local_n_btmask;
bool keep_syms;
bool default_copy;
bfd_size_type symcount;
struct coff_link_hash_entry **sym_hash;
bfd_size_type symesz;
bfd_byte *esym;
bfd_byte *esym_end;
bfd_size_type amt;
symcount = obj_raw_syment_count (abfd);
if (symcount == 0)
return true; /* Nothing to do. */
/* Keep the symbols during this function, in case the linker needs
to read the generic symbols in order to report an error message. */
keep_syms = obj_coff_keep_syms (abfd);
obj_coff_keep_syms (abfd) = true;
if (info->keep_memory)
default_copy = false;
else
default_copy = true;
/* We keep a list of the linker hash table entries that correspond
to particular symbols. */
amt = symcount * sizeof (struct coff_link_hash_entry *);
sym_hash = (struct coff_link_hash_entry **) bfd_zalloc (abfd, amt);
if (sym_hash == NULL)
goto error_return;
obj_coff_sym_hashes (abfd) = sym_hash;
symesz = bfd_coff_symesz (abfd);
BFD_ASSERT (symesz == bfd_coff_auxesz (abfd));
esym = (bfd_byte *) obj_coff_external_syms (abfd);
esym_end = esym + symcount * symesz;
while (esym < esym_end)
{
struct internal_syment sym;
enum coff_symbol_classification classification;
bool copy;
bfd_coff_swap_sym_in (abfd, esym, &sym);
classification = bfd_coff_classify_symbol (abfd, &sym);
if (classification != COFF_SYMBOL_LOCAL)
{
const char *name;
char buf[SYMNMLEN + 1];
flagword flags;
asection *section;
bfd_vma value;
bool addit;
bool discarded = false;
/* This symbol is externally visible. */
name = _bfd_coff_internal_syment_name (abfd, &sym, buf);
if (name == NULL)
goto error_return;
/* We must copy the name into memory if we got it from the
syment itself, rather than the string table. */
copy = default_copy;
if (sym._n._n_n._n_zeroes != 0
|| sym._n._n_n._n_offset == 0)
copy = true;
value = sym.n_value;
switch (classification)
{
default:
abort ();
case COFF_SYMBOL_GLOBAL:
flags = BSF_EXPORT | BSF_GLOBAL;
section = coff_section_from_bfd_index (abfd, sym.n_scnum);
if (discarded_section (section))
{
discarded = true;
section = bfd_und_section_ptr;
}
else if (! obj_pe (abfd))
value -= section->vma;
break;
case COFF_SYMBOL_UNDEFINED:
flags = 0;
section = bfd_und_section_ptr;
break;
case COFF_SYMBOL_COMMON:
flags = BSF_GLOBAL;
section = bfd_com_section_ptr;
break;
case COFF_SYMBOL_PE_SECTION:
flags = BSF_SECTION_SYM | BSF_GLOBAL;
section = coff_section_from_bfd_index (abfd, sym.n_scnum);
if (discarded_section (section))
section = bfd_und_section_ptr;
break;
}
if (IS_WEAK_EXTERNAL (abfd, sym))
flags = BSF_WEAK;
addit = true;
/* In the PE format, section symbols actually refer to the
start of the output section. We handle them specially
here. */
if (obj_pe (abfd) && (flags & BSF_SECTION_SYM) != 0)
{
*sym_hash = coff_link_hash_lookup (coff_hash_table (info),
name, false, copy, false);
if (*sym_hash != NULL)
{
if (((*sym_hash)->coff_link_hash_flags
& COFF_LINK_HASH_PE_SECTION_SYMBOL) == 0
&& (*sym_hash)->root.type != bfd_link_hash_undefined
&& (*sym_hash)->root.type != bfd_link_hash_undefweak)
_bfd_error_handler
(_("warning: symbol `%s' is both section and non-section"),
name);
addit = false;
}
}
/* The Microsoft Visual C compiler does string pooling by
hashing the constants to an internal symbol name, and
relying on the linker comdat support to discard
duplicate names. However, if one string is a literal and
one is a data initializer, one will end up in the .data
section and one will end up in the .rdata section. The
Microsoft linker will combine them into the .data
section, which seems to be wrong since it might cause the
literal to change.
As long as there are no external references to the
symbols, which there shouldn't be, we can treat the .data
and .rdata instances as separate symbols. The comdat
code in the linker will do the appropriate merging. Here
we avoid getting a multiple definition error for one of
these special symbols.
FIXME: I don't think this will work in the case where
there are two object files which use the constants as a
literal and two object files which use it as a data
initializer. One or the other of the second object files
is going to wind up with an inappropriate reference. */
if (obj_pe (abfd)
&& (classification == COFF_SYMBOL_GLOBAL
|| classification == COFF_SYMBOL_PE_SECTION)
&& coff_section_data (abfd, section) != NULL
&& coff_section_data (abfd, section)->comdat != NULL
&& startswith (name, "??_")
&& strcmp (name, coff_section_data (abfd, section)->comdat->name) == 0)
{
if (*sym_hash == NULL)
*sym_hash = coff_link_hash_lookup (coff_hash_table (info),
name, false, copy, false);
if (*sym_hash != NULL
&& (*sym_hash)->root.type == bfd_link_hash_defined
&& coff_section_data (abfd, (*sym_hash)->root.u.def.section)->comdat != NULL
&& strcmp (coff_section_data (abfd, (*sym_hash)->root.u.def.section)->comdat->name,
coff_section_data (abfd, section)->comdat->name) == 0)
addit = false;
}
if (addit)
{
if (! (bfd_coff_link_add_one_symbol
(info, abfd, name, flags, section, value,
(const char *) NULL, copy, false,
(struct bfd_link_hash_entry **) sym_hash)))
goto error_return;
if (discarded)
(*sym_hash)->indx = -3;
}
if (obj_pe (abfd) && (flags & BSF_SECTION_SYM) != 0)
(*sym_hash)->coff_link_hash_flags |=
COFF_LINK_HASH_PE_SECTION_SYMBOL;
/* Limit the alignment of a common symbol to the possible
alignment of a section. There is no point to permitting
a higher alignment for a common symbol: we can not
guarantee it, and it may cause us to allocate extra space
in the common section. */
if (section == bfd_com_section_ptr
&& (*sym_hash)->root.type == bfd_link_hash_common
&& ((*sym_hash)->root.u.c.p->alignment_power
> bfd_coff_default_section_alignment_power (abfd)))
(*sym_hash)->root.u.c.p->alignment_power
= bfd_coff_default_section_alignment_power (abfd);
if (bfd_get_flavour (info->output_bfd) == bfd_get_flavour (abfd))
{
/* If we don't have any symbol information currently in
the hash table, or if we are looking at a symbol
definition, then update the symbol class and type in
the hash table. */
if (((*sym_hash)->symbol_class == C_NULL
&& (*sym_hash)->type == T_NULL)
|| sym.n_scnum != 0
|| (sym.n_value != 0
&& (*sym_hash)->root.type != bfd_link_hash_defined
&& (*sym_hash)->root.type != bfd_link_hash_defweak))
{
(*sym_hash)->symbol_class = sym.n_sclass;
if (sym.n_type != T_NULL)
{
/* We want to warn if the type changed, but not
if it changed from an unspecified type.
Testing the whole type byte may work, but the
change from (e.g.) a function of unspecified
type to function of known type also wants to
skip the warning. */
if ((*sym_hash)->type != T_NULL
&& (*sym_hash)->type != sym.n_type
&& !(DTYPE ((*sym_hash)->type) == DTYPE (sym.n_type)
&& (BTYPE ((*sym_hash)->type) == T_NULL
|| BTYPE (sym.n_type) == T_NULL)))
_bfd_error_handler
/* xgettext: c-format */
(_("warning: type of symbol `%s' changed"
" from %d to %d in %pB"),
name, (*sym_hash)->type, sym.n_type, abfd);
/* We don't want to change from a meaningful
base type to a null one, but if we know
nothing, take what little we might now know. */
if (BTYPE (sym.n_type) != T_NULL
|| (*sym_hash)->type == T_NULL)
(*sym_hash)->type = sym.n_type;
}
(*sym_hash)->auxbfd = abfd;
if (sym.n_numaux != 0)
{
union internal_auxent *alloc;
unsigned int i;
bfd_byte *eaux;
union internal_auxent *iaux;
(*sym_hash)->numaux = sym.n_numaux;
alloc = ((union internal_auxent *)
bfd_hash_allocate (&info->hash->table,
(sym.n_numaux
* sizeof (*alloc))));
if (alloc == NULL)
goto error_return;
for (i = 0, eaux = esym + symesz, iaux = alloc;
i < sym.n_numaux;
i++, eaux += symesz, iaux++)
bfd_coff_swap_aux_in (abfd, eaux, sym.n_type,
sym.n_sclass, (int) i,
sym.n_numaux, iaux);
(*sym_hash)->aux = alloc;
}
}
}
if (classification == COFF_SYMBOL_PE_SECTION
&& (*sym_hash)->numaux != 0)
{
/* Some PE sections (such as .bss) have a zero size in
the section header, but a non-zero size in the AUX
record. Correct that here.
FIXME: This is not at all the right place to do this.
For example, it won't help objdump. This needs to be
done when we swap in the section header. */
BFD_ASSERT ((*sym_hash)->numaux == 1);
if (section->size == 0)
section->size = (*sym_hash)->aux[0].x_scn.x_scnlen;
/* FIXME: We could test whether the section sizes
matches the size in the aux entry, but apparently
that sometimes fails unexpectedly. */
}
}
esym += (sym.n_numaux + 1) * symesz;
sym_hash += sym.n_numaux + 1;
}
/* If this is a non-traditional, non-relocatable link, try to
optimize the handling of any .stab/.stabstr sections. */
if (! bfd_link_relocatable (info)
&& ! info->traditional_format
&& bfd_get_flavour (info->output_bfd) == bfd_get_flavour (abfd)
&& (info->strip != strip_all && info->strip != strip_debugger))
{
asection *stabstr;
stabstr = bfd_get_section_by_name (abfd, ".stabstr");
if (stabstr != NULL)
{
bfd_size_type string_offset = 0;
asection *stab;
for (stab = abfd->sections; stab; stab = stab->next)
if (startswith (stab->name, ".stab")
&& (!stab->name[5]
|| (stab->name[5] == '.' && ISDIGIT (stab->name[6]))))
{
struct coff_link_hash_table *table;
struct coff_section_tdata *secdata
= coff_section_data (abfd, stab);
if (secdata == NULL)
{
amt = sizeof (struct coff_section_tdata);
stab->used_by_bfd = bfd_zalloc (abfd, amt);
if (stab->used_by_bfd == NULL)
goto error_return;
secdata = coff_section_data (abfd, stab);
}
table = coff_hash_table (info);
if (! _bfd_link_section_stabs (abfd, &table->stab_info,
stab, stabstr,
&secdata->stab_info,
&string_offset))
goto error_return;
}
}
}
obj_coff_keep_syms (abfd) = keep_syms;
return true;
error_return:
obj_coff_keep_syms (abfd) = keep_syms;
return false;
}
/* Do the final link step. */
bool
_bfd_coff_final_link (bfd *abfd,
struct bfd_link_info *info)
{
bfd_size_type symesz;
struct coff_final_link_info flaginfo;
bool debug_merge_allocated;
bool long_section_names;
asection *o;
struct bfd_link_order *p;
bfd_size_type max_sym_count;
bfd_size_type max_lineno_count;
bfd_size_type max_reloc_count;
bfd_size_type max_output_reloc_count;
bfd_size_type max_contents_size;
file_ptr rel_filepos;
unsigned int relsz;
file_ptr line_filepos;
unsigned int linesz;
bfd *sub;
bfd_byte *external_relocs = NULL;
char strbuf[STRING_SIZE_SIZE];
bfd_size_type amt;
symesz = bfd_coff_symesz (abfd);
flaginfo.info = info;
flaginfo.output_bfd = abfd;
flaginfo.strtab = NULL;
flaginfo.section_info = NULL;
flaginfo.last_file_index = -1;
flaginfo.last_bf_index = -1;
flaginfo.internal_syms = NULL;
flaginfo.sec_ptrs = NULL;
flaginfo.sym_indices = NULL;
flaginfo.outsyms = NULL;
flaginfo.linenos = NULL;
flaginfo.contents = NULL;
flaginfo.external_relocs = NULL;
flaginfo.internal_relocs = NULL;
flaginfo.global_to_static = false;
debug_merge_allocated = false;
coff_data (abfd)->link_info = info;
flaginfo.strtab = _bfd_stringtab_init ();
if (flaginfo.strtab == NULL)
goto error_return;
if (! coff_debug_merge_hash_table_init (&flaginfo.debug_merge))
goto error_return;
debug_merge_allocated = true;
/* Compute the file positions for all the sections. */
if (! abfd->output_has_begun)
{
if (! bfd_coff_compute_section_file_positions (abfd))
goto error_return;
}
/* Count the line numbers and relocation entries required for the
output file. Set the file positions for the relocs. */
rel_filepos = obj_relocbase (abfd);
relsz = bfd_coff_relsz (abfd);
max_contents_size = 0;
max_lineno_count = 0;
max_reloc_count = 0;
long_section_names = false;
for (o = abfd->sections; o != NULL; o = o->next)
{
o->reloc_count = 0;
o->lineno_count = 0;
for (p = o->map_head.link_order; p != NULL; p = p->next)
{
if (p->type == bfd_indirect_link_order)
{
asection *sec;
sec = p->u.indirect.section;
/* Mark all sections which are to be included in the
link. This will normally be every section. We need
to do this so that we can identify any sections which
the linker has decided to not include. */
sec->linker_mark = true;
if (info->strip == strip_none
|| info->strip == strip_some)
o->lineno_count += sec->lineno_count;
if (bfd_link_relocatable (info))
o->reloc_count += sec->reloc_count;
if (sec->rawsize > max_contents_size)
max_contents_size = sec->rawsize;
if (sec->size > max_contents_size)
max_contents_size = sec->size;
if (sec->lineno_count > max_lineno_count)
max_lineno_count = sec->lineno_count;
if (sec->reloc_count > max_reloc_count)
max_reloc_count = sec->reloc_count;
}
else if (bfd_link_relocatable (info)
&& (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order))
++o->reloc_count;
}
if (o->reloc_count == 0)
o->rel_filepos = 0;
else
{
o->flags |= SEC_RELOC;
o->rel_filepos = rel_filepos;
rel_filepos += o->reloc_count * relsz;
/* In PE COFF, if there are at least 0xffff relocations an
extra relocation will be written out to encode the count. */
if ((obj_pe (abfd) || obj_go32 (abfd)) && o->reloc_count >= 0xffff)
rel_filepos += relsz;
}
if (bfd_coff_long_section_names (abfd)
&& strlen (o->name) > SCNNMLEN)
{
/* This section has a long name which must go in the string
table. This must correspond to the code in
coff_write_object_contents which puts the string index
into the s_name field of the section header. That is why
we pass hash as FALSE. */
if (_bfd_stringtab_add (flaginfo.strtab, o->name, false, false)
== (bfd_size_type) -1)
goto error_return;
long_section_names = true;
}
}
/* If doing a relocatable link, allocate space for the pointers we
need to keep. */
if (bfd_link_relocatable (info))
{
unsigned int i;
/* We use section_count + 1, rather than section_count, because
the target_index fields are 1 based. */
amt = abfd->section_count + 1;
amt *= sizeof (struct coff_link_section_info);
flaginfo.section_info = (struct coff_link_section_info *) bfd_malloc (amt);
if (flaginfo.section_info == NULL)
goto error_return;
for (i = 0; i <= abfd->section_count; i++)
{
flaginfo.section_info[i].relocs = NULL;
flaginfo.section_info[i].rel_hashes = NULL;
}
}
/* We now know the size of the relocs, so we can determine the file
positions of the line numbers. */
line_filepos = rel_filepos;
linesz = bfd_coff_linesz (abfd);
max_output_reloc_count = 0;
for (o = abfd->sections; o != NULL; o = o->next)
{
if (o->lineno_count == 0)
o->line_filepos = 0;
else
{
o->line_filepos = line_filepos;
line_filepos += o->lineno_count * linesz;
}
if (o->reloc_count != 0)
{
/* We don't know the indices of global symbols until we have
written out all the local symbols. For each section in
the output file, we keep an array of pointers to hash
table entries. Each entry in the array corresponds to a
reloc. When we find a reloc against a global symbol, we
set the corresponding entry in this array so that we can
fix up the symbol index after we have written out all the
local symbols.
Because of this problem, we also keep the relocs in
memory until the end of the link. This wastes memory,
but only when doing a relocatable link, which is not the
common case. */
BFD_ASSERT (bfd_link_relocatable (info));
amt = o->reloc_count;
amt *= sizeof (struct internal_reloc);
flaginfo.section_info[o->target_index].relocs =
(struct internal_reloc *) bfd_malloc (amt);
amt = o->reloc_count;
amt *= sizeof (struct coff_link_hash_entry *);
flaginfo.section_info[o->target_index].rel_hashes =
(struct coff_link_hash_entry **) bfd_malloc (amt);
if (flaginfo.section_info[o->target_index].relocs == NULL
|| flaginfo.section_info[o->target_index].rel_hashes == NULL)
goto error_return;
if (o->reloc_count > max_output_reloc_count)
max_output_reloc_count = o->reloc_count;
}
/* Reset the reloc and lineno counts, so that we can use them to
count the number of entries we have output so far. */
o->reloc_count = 0;
o->lineno_count = 0;
}
obj_sym_filepos (abfd) = line_filepos;
/* Figure out the largest number of symbols in an input BFD. Take
the opportunity to clear the output_has_begun fields of all the
input BFD's. */
max_sym_count = 0;
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
{
size_t sz;
sub->output_has_begun = false;
sz = bfd_family_coff (sub) ? obj_raw_syment_count (sub) : 2;
if (sz > max_sym_count)
max_sym_count = sz;
}
/* Allocate some buffers used while linking. */
amt = max_sym_count * sizeof (struct internal_syment);
flaginfo.internal_syms = (struct internal_syment *) bfd_malloc (amt);
amt = max_sym_count * sizeof (asection *);
flaginfo.sec_ptrs = (asection **) bfd_malloc (amt);
amt = max_sym_count * sizeof (long);
flaginfo.sym_indices = (long int *) bfd_malloc (amt);
flaginfo.outsyms = (bfd_byte *) bfd_malloc ((max_sym_count + 1) * symesz);
amt = max_lineno_count * bfd_coff_linesz (abfd);
flaginfo.linenos = (bfd_byte *) bfd_malloc (amt);
flaginfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
amt = max_reloc_count * relsz;
flaginfo.external_relocs = (bfd_byte *) bfd_malloc (amt);
if (! bfd_link_relocatable (info))
{
amt = max_reloc_count * sizeof (struct internal_reloc);
flaginfo.internal_relocs = (struct internal_reloc *) bfd_malloc (amt);
}
if ((flaginfo.internal_syms == NULL && max_sym_count > 0)
|| (flaginfo.sec_ptrs == NULL && max_sym_count > 0)
|| (flaginfo.sym_indices == NULL && max_sym_count > 0)
|| flaginfo.outsyms == NULL
|| (flaginfo.linenos == NULL && max_lineno_count > 0)
|| (flaginfo.contents == NULL && max_contents_size > 0)
|| (flaginfo.external_relocs == NULL && max_reloc_count > 0)
|| (! bfd_link_relocatable (info)
&& flaginfo.internal_relocs == NULL
&& max_reloc_count > 0))
goto error_return;
/* We now know the position of everything in the file, except that
we don't know the size of the symbol table and therefore we don't
know where the string table starts. We just build the string
table in memory as we go along. We process all the relocations
for a single input file at once. */
obj_raw_syment_count (abfd) = 0;
if (coff_backend_info (abfd)->_bfd_coff_start_final_link)
{
if (! bfd_coff_start_final_link (abfd, info))
goto error_return;
}
for (o = abfd->sections; o != NULL; o = o->next)
{
for (p = o->map_head.link_order; p != NULL; p = p->next)
{
if (p->type == bfd_indirect_link_order
&& bfd_family_coff (p->u.indirect.section->owner))
{
sub = p->u.indirect.section->owner;
if (! bfd_coff_link_output_has_begun (sub, & flaginfo))
{
if (! _bfd_coff_link_input_bfd (&flaginfo, sub))
goto error_return;
sub->output_has_begun = true;
}
}
else if (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order)
{
if (! _bfd_coff_reloc_link_order (abfd, &flaginfo, o, p))
goto error_return;
}
else
{
if (! _bfd_default_link_order (abfd, info, o, p))
goto error_return;
}
}
}
if (flaginfo.info->strip != strip_all && flaginfo.info->discard != discard_all)
{
/* Add local symbols from foreign inputs. */
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
{
unsigned int i;
if (bfd_family_coff (sub) || ! bfd_get_outsymbols (sub))
continue;
for (i = 0; i < bfd_get_symcount (sub); ++i)
{
asymbol *sym = bfd_get_outsymbols (sub) [i];
file_ptr pos;
struct internal_syment isym;
union internal_auxent iaux;
bfd_size_type string_size = 0, indx;
bfd_vma written = 0;
bool rewrite = false, hash;
if (! (sym->flags & BSF_LOCAL)
|| (sym->flags & (BSF_SECTION_SYM | BSF_DEBUGGING_RELOC
| BSF_THREAD_LOCAL | BSF_RELC | BSF_SRELC
| BSF_SYNTHETIC))
|| ((sym->flags & BSF_DEBUGGING)
&& ! (sym->flags & BSF_FILE)))
continue;
/* See if we are discarding symbols with this name. */
if ((flaginfo.info->strip == strip_some
&& (bfd_hash_lookup (flaginfo.info->keep_hash,
bfd_asymbol_name(sym), false, false)
== NULL))
|| (((flaginfo.info->discard == discard_sec_merge
&& (bfd_asymbol_section (sym)->flags & SEC_MERGE)
&& ! bfd_link_relocatable (flaginfo.info))
|| flaginfo.info->discard == discard_l)
&& bfd_is_local_label_name (sub, bfd_asymbol_name(sym))))
continue;
pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd)
* symesz;
if (bfd_seek (abfd, pos, SEEK_SET) != 0)
goto error_return;
if (! coff_write_alien_symbol(abfd, sym, &isym, &iaux, &written,
&string_size, NULL, NULL))
goto error_return;
hash = !flaginfo.info->traditional_format;
if (string_size >= 6 && isym.n_sclass == C_FILE
&& ! isym._n._n_n._n_zeroes && isym.n_numaux)
{
indx = _bfd_stringtab_add (flaginfo.strtab, ".file", hash,
false);
if (indx == (bfd_size_type) -1)
goto error_return;
isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
bfd_coff_swap_sym_out (abfd, &isym, flaginfo.outsyms);
if (bfd_seek (abfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo.outsyms, symesz,
abfd) != symesz)
goto error_return;
string_size -= 6;
}
if (string_size)
{
indx = _bfd_stringtab_add (flaginfo.strtab,
bfd_asymbol_name (sym), hash,
false);
if (indx == (bfd_size_type) -1)
goto error_return;
if (isym.n_sclass != C_FILE)
{
isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
bfd_coff_swap_sym_out (abfd, &isym, flaginfo.outsyms);
rewrite = true;
}
else
{
BFD_ASSERT (isym.n_numaux == 1);
iaux.x_file.x_n.x_offset = STRING_SIZE_SIZE + indx;
bfd_coff_swap_aux_out (abfd, &iaux, isym.n_type, C_FILE,
0, 1, flaginfo.outsyms + symesz);
if (bfd_seek (abfd, pos + symesz, SEEK_SET) != 0
|| bfd_bwrite (flaginfo.outsyms + symesz, symesz,
abfd) != symesz)
goto error_return;
}
}
if (isym.n_sclass == C_FILE)
{
if (flaginfo.last_file_index != -1)
{
flaginfo.last_file.n_value = obj_raw_syment_count (abfd);
bfd_coff_swap_sym_out (abfd, &flaginfo.last_file,
flaginfo.outsyms);
pos = obj_sym_filepos (abfd) + flaginfo.last_file_index
* symesz;
rewrite = true;
}
flaginfo.last_file_index = obj_raw_syment_count (abfd);
flaginfo.last_file = isym;
}
if (rewrite
&& (bfd_seek (abfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo.outsyms, symesz, abfd) != symesz))
goto error_return;
obj_raw_syment_count (abfd) += written;
}
}
}
if (! bfd_coff_final_link_postscript (abfd, & flaginfo))
goto error_return;
/* Free up the buffers used by _bfd_coff_link_input_bfd. */
coff_debug_merge_hash_table_free (&flaginfo.debug_merge);
debug_merge_allocated = false;
free (flaginfo.internal_syms);
flaginfo.internal_syms = NULL;
free (flaginfo.sec_ptrs);
flaginfo.sec_ptrs = NULL;
free (flaginfo.sym_indices);
flaginfo.sym_indices = NULL;
free (flaginfo.linenos);
flaginfo.linenos = NULL;
free (flaginfo.contents);
flaginfo.contents = NULL;
free (flaginfo.external_relocs);
flaginfo.external_relocs = NULL;
free (flaginfo.internal_relocs);
flaginfo.internal_relocs = NULL;
/* The value of the last C_FILE symbol is supposed to be the symbol
index of the first external symbol. Write it out again if
necessary. */
if (flaginfo.last_file_index != -1
&& (unsigned int) flaginfo.last_file.n_value != obj_raw_syment_count (abfd))
{
file_ptr pos;
flaginfo.last_file.n_value = obj_raw_syment_count (abfd);
bfd_coff_swap_sym_out (abfd, &flaginfo.last_file,
flaginfo.outsyms);
pos = obj_sym_filepos (abfd) + flaginfo.last_file_index * symesz;
if (bfd_seek (abfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo.outsyms, symesz, abfd) != symesz)
return false;
}
/* If doing task linking (ld --task-link) then make a pass through the
global symbols, writing out any that are defined, and making them
static. */
if (info->task_link)
{
flaginfo.failed = false;
coff_link_hash_traverse (coff_hash_table (info),
_bfd_coff_write_task_globals, &flaginfo);
if (flaginfo.failed)
goto error_return;
}
/* Write out the global symbols. */
flaginfo.failed = false;
bfd_hash_traverse (&info->hash->table, _bfd_coff_write_global_sym, &flaginfo);
if (flaginfo.failed)
goto error_return;
/* The outsyms buffer is used by _bfd_coff_write_global_sym. */
free (flaginfo.outsyms);
flaginfo.outsyms = NULL;
if (bfd_link_relocatable (info) && max_output_reloc_count > 0)
{
/* Now that we have written out all the global symbols, we know
the symbol indices to use for relocs against them, and we can
finally write out the relocs. */
amt = max_output_reloc_count * relsz;
external_relocs = (bfd_byte *) bfd_malloc (amt);
if (external_relocs == NULL)
goto error_return;
for (o = abfd->sections; o != NULL; o = o->next)
{
struct internal_reloc *irel;
struct internal_reloc *irelend;
struct coff_link_hash_entry **rel_hash;
bfd_byte *erel;
if (o->reloc_count == 0)
continue;
irel = flaginfo.section_info[o->target_index].relocs;
irelend = irel + o->reloc_count;
rel_hash = flaginfo.section_info[o->target_index].rel_hashes;
erel = external_relocs;
for (; irel < irelend; irel++, rel_hash++, erel += relsz)
{
if (*rel_hash != NULL)
{
BFD_ASSERT ((*rel_hash)->indx >= 0);
irel->r_symndx = (*rel_hash)->indx;
}
bfd_coff_swap_reloc_out (abfd, irel, erel);
}
if (bfd_seek (abfd, o->rel_filepos, SEEK_SET) != 0)
goto error_return;
if ((obj_pe (abfd) || obj_go32 (abfd)) && o->reloc_count >= 0xffff)
{
/* In PE COFF, write the count of relocs as the first
reloc. The header overflow bit will be set
elsewhere. */
struct internal_reloc incount;
bfd_byte *excount = (bfd_byte *)bfd_malloc (relsz);
memset (&incount, 0, sizeof (incount));
incount.r_vaddr = o->reloc_count + 1;
bfd_coff_swap_reloc_out (abfd, &incount, excount);
if (bfd_bwrite (excount, relsz, abfd) != relsz)
/* We'll leak, but it's an error anyway. */
goto error_return;
free (excount);
}
if (bfd_bwrite (external_relocs,
(bfd_size_type) relsz * o->reloc_count, abfd)
!= (bfd_size_type) relsz * o->reloc_count)
goto error_return;
}
free (external_relocs);
external_relocs = NULL;
}
/* Free up the section information. */
if (flaginfo.section_info != NULL)
{
unsigned int i;
for (i = 0; i < abfd->section_count; i++)
{
free (flaginfo.section_info[i].relocs);
free (flaginfo.section_info[i].rel_hashes);
}
free (flaginfo.section_info);
flaginfo.section_info = NULL;
}
/* If we have optimized stabs strings, output them. */
if (coff_hash_table (info)->stab_info.stabstr != NULL)
{
if (! _bfd_write_stab_strings (abfd, &coff_hash_table (info)->stab_info))
return false;
}
/* Write out the string table. */
if (obj_raw_syment_count (abfd) != 0 || long_section_names)
{
file_ptr pos;
pos = obj_sym_filepos (abfd) + obj_raw_syment_count (abfd) * symesz;
if (bfd_seek (abfd, pos, SEEK_SET) != 0)
return false;
#if STRING_SIZE_SIZE == 4
H_PUT_32 (abfd,
_bfd_stringtab_size (flaginfo.strtab) + STRING_SIZE_SIZE,
strbuf);
#else
#error Change H_PUT_32 above
#endif
if (bfd_bwrite (strbuf, (bfd_size_type) STRING_SIZE_SIZE, abfd)
!= STRING_SIZE_SIZE)
return false;
if (! _bfd_stringtab_emit (abfd, flaginfo.strtab))
return false;
obj_coff_strings_written (abfd) = true;
}
_bfd_stringtab_free (flaginfo.strtab);
/* Setting symcount to 0 will cause write_object_contents to
not try to write out the symbols. */
abfd->symcount = 0;
return true;
error_return:
if (debug_merge_allocated)
coff_debug_merge_hash_table_free (&flaginfo.debug_merge);
if (flaginfo.strtab != NULL)
_bfd_stringtab_free (flaginfo.strtab);
if (flaginfo.section_info != NULL)
{
unsigned int i;
for (i = 0; i < abfd->section_count; i++)
{
free (flaginfo.section_info[i].relocs);
free (flaginfo.section_info[i].rel_hashes);
}
free (flaginfo.section_info);
}
free (flaginfo.internal_syms);
free (flaginfo.sec_ptrs);
free (flaginfo.sym_indices);
free (flaginfo.outsyms);
free (flaginfo.linenos);
free (flaginfo.contents);
free (flaginfo.external_relocs);
free (flaginfo.internal_relocs);
free (external_relocs);
return false;
}
/* Parse out a -heap <reserved>,<commit> line. */
static char *
dores_com (char *ptr, bfd *output_bfd, int heap)
{
if (coff_data(output_bfd)->pe)
{
int val = strtoul (ptr, &ptr, 0);
if (heap)
pe_data(output_bfd)->pe_opthdr.SizeOfHeapReserve = val;
else
pe_data(output_bfd)->pe_opthdr.SizeOfStackReserve = val;
if (ptr[0] == ',')
{
val = strtoul (ptr+1, &ptr, 0);
if (heap)
pe_data(output_bfd)->pe_opthdr.SizeOfHeapCommit = val;
else
pe_data(output_bfd)->pe_opthdr.SizeOfStackCommit = val;
}
}
return ptr;
}
static char *
get_name (char *ptr, char **dst)
{
while (*ptr == ' ')
ptr++;
*dst = ptr;
while (*ptr && *ptr != ' ')
ptr++;
*ptr = 0;
return ptr+1;
}
/* Process any magic embedded commands in a section called .drectve. */
static int
process_embedded_commands (bfd *output_bfd,
struct bfd_link_info *info ATTRIBUTE_UNUSED,
bfd *abfd)
{
asection *sec = bfd_get_section_by_name (abfd, ".drectve");
char *s;
char *e;
bfd_byte *copy;
if (!sec)
return 1;
if (!bfd_malloc_and_get_section (abfd, sec, &copy))
{
free (copy);
return 0;
}
e = (char *) copy + sec->size;
for (s = (char *) copy; s < e ; )
{
if (s[0] != '-')
{
s++;
continue;
}
if (startswith (s, "-attr"))
{
char *name;
char *attribs;
asection *asec;
int loop = 1;
int had_write = 0;
int had_exec= 0;
s += 5;
s = get_name (s, &name);
s = get_name (s, &attribs);
while (loop)
{
switch (*attribs++)
{
case 'W':
had_write = 1;
break;
case 'R':
break;
case 'S':
break;
case 'X':
had_exec = 1;
break;
default:
loop = 0;
}
}
asec = bfd_get_section_by_name (abfd, name);
if (asec)
{
if (had_exec)
asec->flags |= SEC_CODE;
if (!had_write)
asec->flags |= SEC_READONLY;
}
}
else if (startswith (s, "-heap"))
s = dores_com (s + 5, output_bfd, 1);
else if (startswith (s, "-stack"))
s = dores_com (s + 6, output_bfd, 0);
/* GNU extension for aligned commons. */
else if (startswith (s, "-aligncomm:"))
{
/* Common symbols must be aligned on reading, as it
is too late to do anything here, after they have
already been allocated, so just skip the directive. */
s += 11;
}
else
s++;
}
free (copy);
return 1;
}
/* Place a marker against all symbols which are used by relocations.
This marker can be picked up by the 'do we skip this symbol ?'
loop in _bfd_coff_link_input_bfd() and used to prevent skipping
that symbol. */
static void
mark_relocs (struct coff_final_link_info *flaginfo, bfd *input_bfd)
{
asection * a;
if ((bfd_get_file_flags (input_bfd) & HAS_SYMS) == 0)
return;
for (a = input_bfd->sections; a != (asection *) NULL; a = a->next)
{
struct internal_reloc * internal_relocs;
struct internal_reloc * irel;
struct internal_reloc * irelend;
if ((a->flags & SEC_RELOC) == 0 || a->reloc_count < 1
|| a->linker_mark == 0)
continue;
/* Don't mark relocs in excluded sections. */
if (a->output_section == bfd_abs_section_ptr)
continue;
/* Read in the relocs. */
internal_relocs = _bfd_coff_read_internal_relocs
(input_bfd, a, false,
flaginfo->external_relocs,
bfd_link_relocatable (flaginfo->info),
(bfd_link_relocatable (flaginfo->info)
? (flaginfo->section_info[ a->output_section->target_index ].relocs + a->output_section->reloc_count)
: flaginfo->internal_relocs)
);
if (internal_relocs == NULL)
continue;
irel = internal_relocs;
irelend = irel + a->reloc_count;
/* Place a mark in the sym_indices array (whose entries have
been initialised to 0) for all of the symbols that are used
in the relocation table. This will then be picked up in the
skip/don't-skip pass. */
for (; irel < irelend; irel++)
if ((unsigned long) irel->r_symndx < obj_raw_syment_count (input_bfd))
flaginfo->sym_indices[irel->r_symndx] = -1;
}
}
/* Link an input file into the linker output file. This function
handles all the sections and relocations of the input file at once. */
bool
_bfd_coff_link_input_bfd (struct coff_final_link_info *flaginfo, bfd *input_bfd)
{
unsigned int n_tmask = coff_data (input_bfd)->local_n_tmask;
unsigned int n_btshft = coff_data (input_bfd)->local_n_btshft;
bool (*adjust_symndx)
(bfd *, struct bfd_link_info *, bfd *, asection *,
struct internal_reloc *, bool *);
bfd *output_bfd;
const char *strings;
bfd_size_type syment_base;
bool copy, hash;
bfd_size_type isymesz;
bfd_size_type osymesz;
bfd_size_type linesz;
bfd_byte *esym;
bfd_byte *esym_end;
struct internal_syment *isymp;
asection **secpp;
long *indexp;
unsigned long output_index;
bfd_byte *outsym;
struct coff_link_hash_entry **sym_hash;
asection *o;
/* Move all the symbols to the output file. */
output_bfd = flaginfo->output_bfd;
strings = NULL;
syment_base = obj_raw_syment_count (output_bfd);
isymesz = bfd_coff_symesz (input_bfd);
osymesz = bfd_coff_symesz (output_bfd);
linesz = bfd_coff_linesz (input_bfd);
BFD_ASSERT (linesz == bfd_coff_linesz (output_bfd));
copy = false;
if (! flaginfo->info->keep_memory)
copy = true;
hash = true;
if (flaginfo->info->traditional_format)
hash = false;
if (! _bfd_coff_get_external_symbols (input_bfd))
return false;
esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
isymp = flaginfo->internal_syms;
secpp = flaginfo->sec_ptrs;
indexp = flaginfo->sym_indices;
output_index = syment_base;
outsym = flaginfo->outsyms;
if (coff_data (output_bfd)->pe
&& ! process_embedded_commands (output_bfd, flaginfo->info, input_bfd))
return false;
/* If we are going to perform relocations and also strip/discard some
symbols then we must make sure that we do not strip/discard those
symbols that are going to be involved in the relocations. */
if (( flaginfo->info->strip != strip_none
|| flaginfo->info->discard != discard_none)
&& bfd_link_relocatable (flaginfo->info))
{
/* Mark the symbol array as 'not-used'. */
memset (indexp, 0, obj_raw_syment_count (input_bfd) * sizeof * indexp);
mark_relocs (flaginfo, input_bfd);
}
while (esym < esym_end)
{
struct internal_syment isym;
enum coff_symbol_classification classification;
bool skip;
bool global;
bool dont_skip_symbol;
int add;
bfd_coff_swap_sym_in (input_bfd, esym, isymp);
/* Make a copy of *isymp so that the relocate_section function
always sees the original values. This is more reliable than
always recomputing the symbol value even if we are stripping
the symbol. */
isym = *isymp;
classification = bfd_coff_classify_symbol (input_bfd, &isym);
switch (classification)
{
default:
abort ();
case COFF_SYMBOL_GLOBAL:
case COFF_SYMBOL_PE_SECTION:
case COFF_SYMBOL_LOCAL:
*secpp = coff_section_from_bfd_index (input_bfd, isym.n_scnum);
break;
case COFF_SYMBOL_COMMON:
*secpp = bfd_com_section_ptr;
break;
case COFF_SYMBOL_UNDEFINED:
*secpp = bfd_und_section_ptr;
break;
}
/* Extract the flag indicating if this symbol is used by a
relocation. */
if ((flaginfo->info->strip != strip_none
|| flaginfo->info->discard != discard_none)
&& bfd_link_relocatable (flaginfo->info))
dont_skip_symbol = *indexp;
else
dont_skip_symbol = false;
*indexp = -1;
skip = false;
global = false;
add = 1 + isym.n_numaux;
/* If we are stripping all symbols, we want to skip this one. */
if (flaginfo->info->strip == strip_all && ! dont_skip_symbol)
skip = true;
if (! skip)
{
switch (classification)
{
default:
abort ();
case COFF_SYMBOL_GLOBAL:
case COFF_SYMBOL_COMMON:
case COFF_SYMBOL_PE_SECTION:
/* This is a global symbol. Global symbols come at the
end of the symbol table, so skip them for now.
Locally defined function symbols, however, are an
exception, and are not moved to the end. */
global = true;
if (! ISFCN (isym.n_type))
skip = true;
break;
case COFF_SYMBOL_UNDEFINED:
/* Undefined symbols are left for the end. */
global = true;
skip = true;
break;
case COFF_SYMBOL_LOCAL:
/* This is a local symbol. Skip it if we are discarding
local symbols. */
if (flaginfo->info->discard == discard_all && ! dont_skip_symbol)
skip = true;
break;
}
}
#ifndef COFF_WITH_PE
/* Skip section symbols for sections which are not going to be
emitted. */
if (!skip
&& !dont_skip_symbol
&& isym.n_sclass == C_STAT
&& isym.n_type == T_NULL
&& isym.n_numaux > 0
&& ((*secpp)->output_section == bfd_abs_section_ptr
|| bfd_section_removed_from_list (output_bfd,
(*secpp)->output_section)))
skip = true;
#endif
/* If we stripping debugging symbols, and this is a debugging
symbol, then skip it. FIXME: gas sets the section to N_ABS
for some types of debugging symbols; I don't know if this is
a bug or not. In any case, we handle it here. */
if (! skip
&& flaginfo->info->strip == strip_debugger
&& ! dont_skip_symbol
&& (isym.n_scnum == N_DEBUG
|| (isym.n_scnum == N_ABS
&& (isym.n_sclass == C_AUTO
|| isym.n_sclass == C_REG
|| isym.n_sclass == C_MOS
|| isym.n_sclass == C_MOE
|| isym.n_sclass == C_MOU
|| isym.n_sclass == C_ARG
|| isym.n_sclass == C_REGPARM
|| isym.n_sclass == C_FIELD
|| isym.n_sclass == C_EOS))))
skip = true;
/* If some symbols are stripped based on the name, work out the
name and decide whether to skip this symbol. */
if (! skip
&& (flaginfo->info->strip == strip_some
|| flaginfo->info->discard == discard_l))
{
const char *name;
char buf[SYMNMLEN + 1];
name = _bfd_coff_internal_syment_name (input_bfd, &isym, buf);
if (name == NULL)
return false;
if (! dont_skip_symbol
&& ((flaginfo->info->strip == strip_some
&& (bfd_hash_lookup (flaginfo->info->keep_hash, name, false,
false) == NULL))
|| (! global
&& flaginfo->info->discard == discard_l
&& bfd_is_local_label_name (input_bfd, name))))
skip = true;
}
/* If this is an enum, struct, or union tag, see if we have
already output an identical type. */
if (! skip
&& !flaginfo->info->traditional_format
&& (isym.n_sclass == C_ENTAG
|| isym.n_sclass == C_STRTAG
|| isym.n_sclass == C_UNTAG)
&& isym.n_numaux == 1)
{
const char *name;
char buf[SYMNMLEN + 1];
struct coff_debug_merge_hash_entry *mh;
struct coff_debug_merge_type *mt;
union internal_auxent aux;
struct coff_debug_merge_element **epp;
bfd_byte *esl, *eslend;
struct internal_syment *islp;
size_t amt;
name = _bfd_coff_internal_syment_name (input_bfd, &isym, buf);
if (name == NULL)
return false;
/* Ignore fake names invented by compiler; treat them all as
the same name. */
if (*name == '~' || *name == '.' || *name == '$'
|| (*name == bfd_get_symbol_leading_char (input_bfd)
&& (name[1] == '~' || name[1] == '.' || name[1] == '$')))
name = "";
mh = coff_debug_merge_hash_lookup (&flaginfo->debug_merge, name,
true, true);
if (mh == NULL)
return false;
/* Allocate memory to hold type information. If this turns
out to be a duplicate, we pass this address to
bfd_release. */
amt = sizeof (struct coff_debug_merge_type);
mt = (struct coff_debug_merge_type *) bfd_alloc (input_bfd, amt);
if (mt == NULL)
return false;
mt->type_class = isym.n_sclass;
/* Pick up the aux entry, which points to the end of the tag
entries. */
bfd_coff_swap_aux_in (input_bfd, (esym + isymesz),
isym.n_type, isym.n_sclass, 0, isym.n_numaux,
&aux);
/* Gather the elements. */
epp = &mt->elements;
mt->elements = NULL;
islp = isymp + 2;
esl = esym + 2 * isymesz;
eslend = ((bfd_byte *) obj_coff_external_syms (input_bfd)
+ aux.x_sym.x_fcnary.x_fcn.x_endndx.l * isymesz);
while (esl < eslend)
{
const char *elename;
char elebuf[SYMNMLEN + 1];
char *name_copy;
bfd_coff_swap_sym_in (input_bfd, esl, islp);
amt = sizeof (struct coff_debug_merge_element);
*epp = (struct coff_debug_merge_element *)
bfd_alloc (input_bfd, amt);
if (*epp == NULL)
return false;
elename = _bfd_coff_internal_syment_name (input_bfd, islp,
elebuf);
if (elename == NULL)
return false;
amt = strlen (elename) + 1;
name_copy = (char *) bfd_alloc (input_bfd, amt);
if (name_copy == NULL)
return false;
strcpy (name_copy, elename);
(*epp)->name = name_copy;
(*epp)->type = islp->n_type;
(*epp)->tagndx = 0;
if (islp->n_numaux >= 1
&& islp->n_type != T_NULL
&& islp->n_sclass != C_EOS)
{
union internal_auxent eleaux;
long indx;
bfd_coff_swap_aux_in (input_bfd, (esl + isymesz),
islp->n_type, islp->n_sclass, 0,
islp->n_numaux, &eleaux);
indx = eleaux.x_sym.x_tagndx.l;
/* FIXME: If this tagndx entry refers to a symbol
defined later in this file, we just ignore it.
Handling this correctly would be tedious, and may
not be required. */
if (indx > 0
&& (indx
< ((esym -
(bfd_byte *) obj_coff_external_syms (input_bfd))
/ (long) isymesz)))
{
(*epp)->tagndx = flaginfo->sym_indices[indx];
if ((*epp)->tagndx < 0)
(*epp)->tagndx = 0;
}
}
epp = &(*epp)->next;
*epp = NULL;
esl += (islp->n_numaux + 1) * isymesz;
islp += islp->n_numaux + 1;
}
/* See if we already have a definition which matches this
type. We always output the type if it has no elements,
for simplicity. */
if (mt->elements == NULL)
bfd_release (input_bfd, mt);
else
{
struct coff_debug_merge_type *mtl;
for (mtl = mh->types; mtl != NULL; mtl = mtl->next)
{
struct coff_debug_merge_element *me, *mel;
if (mtl->type_class != mt->type_class)
continue;
for (me = mt->elements, mel = mtl->elements;
me != NULL && mel != NULL;
me = me->next, mel = mel->next)
{
if (strcmp (me->name, mel->name) != 0
|| me->type != mel->type
|| me->tagndx != mel->tagndx)
break;
}
if (me == NULL && mel == NULL)
break;
}
if (mtl == NULL || (bfd_size_type) mtl->indx >= syment_base)
{
/* This is the first definition of this type. */
mt->indx = output_index;
mt->next = mh->types;
mh->types = mt;
}
else
{
/* This is a redefinition which can be merged. */
bfd_release (input_bfd, mt);
*indexp = mtl->indx;
add = (eslend - esym) / isymesz;
skip = true;
}
}
}
/* We now know whether we are to skip this symbol or not. */
if (! skip)
{
/* Adjust the symbol in order to output it. */
if (isym._n._n_n._n_zeroes == 0
&& isym._n._n_n._n_offset != 0)
{
const char *name;
bfd_size_type indx;
/* This symbol has a long name. Enter it in the string
table we are building. Note that we do not check
bfd_coff_symname_in_debug. That is only true for
XCOFF, and XCOFF requires different linking code
anyhow. */
name = _bfd_coff_internal_syment_name (input_bfd, &isym, NULL);
if (name == NULL)
return false;
indx = _bfd_stringtab_add (flaginfo->strtab, name, hash, copy);
if (indx == (bfd_size_type) -1)
return false;
isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
}
switch (isym.n_sclass)
{
case C_AUTO:
case C_MOS:
case C_EOS:
case C_MOE:
case C_MOU:
case C_UNTAG:
case C_STRTAG:
case C_ENTAG:
case C_TPDEF:
case C_ARG:
case C_USTATIC:
case C_REG:
case C_REGPARM:
case C_FIELD:
/* The symbol value should not be modified. */
break;
case C_FCN:
if (obj_pe (input_bfd)
&& memcmp (isym.n_name, ".bf", sizeof ".bf") != 0
&& isym.n_scnum > 0)
{
/* For PE, .lf and .ef get their value left alone,
while .bf gets relocated. However, they all have
"real" section numbers, and need to be moved into
the new section. */
isym.n_scnum = (*secpp)->output_section->target_index;
break;
}
/* Fall through. */
default:
case C_LABEL: /* Not completely sure about these 2 */
case C_EXTDEF:
case C_BLOCK:
case C_EFCN:
case C_NULL:
case C_EXT:
case C_STAT:
case C_SECTION:
case C_NT_WEAK:
/* Compute new symbol location. */
if (isym.n_scnum > 0)
{
isym.n_scnum = (*secpp)->output_section->target_index;
isym.n_value += (*secpp)->output_offset;
if (! obj_pe (input_bfd))
isym.n_value -= (*secpp)->vma;
if (! obj_pe (flaginfo->output_bfd))
isym.n_value += (*secpp)->output_section->vma;
}
break;
case C_FILE:
/* The value of a C_FILE symbol is the symbol index of
the next C_FILE symbol. The value of the last C_FILE
symbol is the symbol index to the first external
symbol (actually, coff_renumber_symbols does not get
this right--it just sets the value of the last C_FILE
symbol to zero--and nobody has ever complained about
it). We try to get this right, below, just before we
write the symbols out, but in the general case we may
have to write the symbol out twice. */
if (flaginfo->last_file_index != -1
&& flaginfo->last_file.n_value != (bfd_vma) output_index)
{
/* We must correct the value of the last C_FILE
entry. */
flaginfo->last_file.n_value = output_index;
if ((bfd_size_type) flaginfo->last_file_index >= syment_base)
{
/* The last C_FILE symbol is in this input file. */
bfd_coff_swap_sym_out (output_bfd,
&flaginfo->last_file,
(flaginfo->outsyms
+ ((flaginfo->last_file_index
- syment_base)
* osymesz)));
}
else
{
file_ptr pos;
/* We have already written out the last C_FILE
symbol. We need to write it out again. We
borrow *outsym temporarily. */
bfd_coff_swap_sym_out (output_bfd,
&flaginfo->last_file, outsym);
pos = obj_sym_filepos (output_bfd);
pos += flaginfo->last_file_index * osymesz;
if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
|| bfd_bwrite (outsym, osymesz, output_bfd) != osymesz)
return false;
}
}
flaginfo->last_file_index = output_index;
flaginfo->last_file = isym;
break;
}
/* If doing task linking, convert normal global function symbols to
static functions. */
if (flaginfo->info->task_link && IS_EXTERNAL (input_bfd, isym))
isym.n_sclass = C_STAT;
/* Output the symbol. */
bfd_coff_swap_sym_out (output_bfd, &isym, outsym);
*indexp = output_index;
if (global)
{
long indx;
struct coff_link_hash_entry *h;
indx = ((esym - (bfd_byte *) obj_coff_external_syms (input_bfd))
/ isymesz);
h = obj_coff_sym_hashes (input_bfd)[indx];
if (h == NULL)
{
/* This can happen if there were errors earlier in
the link. */
bfd_set_error (bfd_error_bad_value);
return false;
}
h->indx = output_index;
}
output_index += add;
outsym += add * osymesz;
}
esym += add * isymesz;
isymp += add;
++secpp;
++indexp;
for (--add; add > 0; --add)
{
*secpp++ = NULL;
*indexp++ = -1;
}
}
/* Fix up the aux entries. This must be done in a separate pass,
because we don't know the correct symbol indices until we have
already decided which symbols we are going to keep. */
esym = (bfd_byte *) obj_coff_external_syms (input_bfd);
esym_end = esym + obj_raw_syment_count (input_bfd) * isymesz;
isymp = flaginfo->internal_syms;
indexp = flaginfo->sym_indices;
sym_hash = obj_coff_sym_hashes (input_bfd);
outsym = flaginfo->outsyms;
while (esym < esym_end)
{
int add;
add = 1 + isymp->n_numaux;
if ((*indexp < 0
|| (bfd_size_type) *indexp < syment_base)
&& (*sym_hash == NULL
|| (*sym_hash)->auxbfd != input_bfd))
esym += add * isymesz;
else
{
struct coff_link_hash_entry *h;
int i;
h = NULL;
if (*indexp < 0)
{
h = *sym_hash;
/* The m68k-motorola-sysv assembler will sometimes
generate two symbols with the same name, but only one
will have aux entries. */
BFD_ASSERT (isymp->n_numaux == 0
|| h->numaux == 0
|| h->numaux == isymp->n_numaux);
}
esym += isymesz;
if (h == NULL)
outsym += osymesz;
/* Handle the aux entries. This handling is based on
coff_pointerize_aux. I don't know if it always correct. */
for (i = 0; i < isymp->n_numaux && esym < esym_end; i++)
{
union internal_auxent aux;
union internal_auxent *auxp;
if (h != NULL && h->aux != NULL && (h->numaux > i))
auxp = h->aux + i;
else
{
bfd_coff_swap_aux_in (input_bfd, esym, isymp->n_type,
isymp->n_sclass, i, isymp->n_numaux, &aux);
auxp = &aux;
}
if (isymp->n_sclass == C_FILE)
{
/* If this is a long filename, we must put it in the
string table. */
if (auxp->x_file.x_n.x_zeroes == 0
&& auxp->x_file.x_n.x_offset != 0)
{
const char *filename;
bfd_size_type indx;
BFD_ASSERT (auxp->x_file.x_n.x_offset
>= STRING_SIZE_SIZE);
if (strings == NULL)
{
strings = _bfd_coff_read_string_table (input_bfd);
if (strings == NULL)
return false;
}
if ((bfd_size_type) auxp->x_file.x_n.x_offset >= obj_coff_strings_len (input_bfd))
filename = _("<corrupt>");
else
filename = strings + auxp->x_file.x_n.x_offset;
indx = _bfd_stringtab_add (flaginfo->strtab, filename,
hash, copy);
if (indx == (bfd_size_type) -1)
return false;
auxp->x_file.x_n.x_offset = STRING_SIZE_SIZE + indx;
}
}
else if ((isymp->n_sclass != C_STAT || isymp->n_type != T_NULL)
&& isymp->n_sclass != C_NT_WEAK)
{
unsigned long indx;
if (ISFCN (isymp->n_type)
|| ISTAG (isymp->n_sclass)
|| isymp->n_sclass == C_BLOCK
|| isymp->n_sclass == C_FCN)
{
indx = auxp->x_sym.x_fcnary.x_fcn.x_endndx.l;
if (indx > 0
&& indx < obj_raw_syment_count (input_bfd))
{
/* We look forward through the symbol for
the index of the next symbol we are going
to include. I don't know if this is
entirely right. */
while ((flaginfo->sym_indices[indx] < 0
|| ((bfd_size_type) flaginfo->sym_indices[indx]
< syment_base))
&& indx < obj_raw_syment_count (input_bfd))
++indx;
if (indx >= obj_raw_syment_count (input_bfd))
indx = output_index;
else
indx = flaginfo->sym_indices[indx];
auxp->x_sym.x_fcnary.x_fcn.x_endndx.l = indx;
}
}
indx = auxp->x_sym.x_tagndx.l;
if (indx > 0 && indx < obj_raw_syment_count (input_bfd))
{
long symindx;
symindx = flaginfo->sym_indices[indx];
if (symindx < 0)
auxp->x_sym.x_tagndx.l = 0;
else
auxp->x_sym.x_tagndx.l = symindx;
}
/* The .bf symbols are supposed to be linked through
the endndx field. We need to carry this list
across object files. */
if (i == 0
&& h == NULL
&& isymp->n_sclass == C_FCN
&& (isymp->_n._n_n._n_zeroes != 0
|| isymp->_n._n_n._n_offset == 0)
&& isymp->_n._n_name[0] == '.'
&& isymp->_n._n_name[1] == 'b'
&& isymp->_n._n_name[2] == 'f'
&& isymp->_n._n_name[3] == '\0')
{
if (flaginfo->last_bf_index != -1)
{
flaginfo->last_bf.x_sym.x_fcnary.x_fcn.x_endndx.l =
*indexp;
if ((bfd_size_type) flaginfo->last_bf_index
>= syment_base)
{
void *auxout;
/* The last .bf symbol is in this input
file. This will only happen if the
assembler did not set up the .bf
endndx symbols correctly. */
auxout = (flaginfo->outsyms
+ ((flaginfo->last_bf_index
- syment_base)
* osymesz));
bfd_coff_swap_aux_out (output_bfd,
&flaginfo->last_bf,
isymp->n_type,
isymp->n_sclass,
0, isymp->n_numaux,
auxout);
}
else
{
file_ptr pos;
/* We have already written out the last
.bf aux entry. We need to write it
out again. We borrow *outsym
temporarily. FIXME: This case should
be made faster. */
bfd_coff_swap_aux_out (output_bfd,
&flaginfo->last_bf,
isymp->n_type,
isymp->n_sclass,
0, isymp->n_numaux,
outsym);
pos = obj_sym_filepos (output_bfd);
pos += flaginfo->last_bf_index * osymesz;
if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
|| (bfd_bwrite (outsym, osymesz, output_bfd)
!= osymesz))
return false;
}
}
if (auxp->x_sym.x_fcnary.x_fcn.x_endndx.l != 0)
flaginfo->last_bf_index = -1;
else
{
/* The endndx field of this aux entry must
be updated with the symbol number of the
next .bf symbol. */
flaginfo->last_bf = *auxp;
flaginfo->last_bf_index = (((outsym - flaginfo->outsyms)
/ osymesz)
+ syment_base);
}
}
}
if (h == NULL)
{
bfd_coff_swap_aux_out (output_bfd, auxp, isymp->n_type,
isymp->n_sclass, i, isymp->n_numaux,
outsym);
outsym += osymesz;
}
esym += isymesz;
}
}
indexp += add;
isymp += add;
sym_hash += add;
}
/* Relocate the line numbers, unless we are stripping them. */
if (flaginfo->info->strip == strip_none
|| flaginfo->info->strip == strip_some)
{
for (o = input_bfd->sections; o != NULL; o = o->next)
{
bfd_vma offset;
bfd_byte *eline;
bfd_byte *elineend;
bfd_byte *oeline;
bool skipping;
file_ptr pos;
bfd_size_type amt;
/* FIXME: If SEC_HAS_CONTENTS is not for the section, then
build_link_order in ldwrite.c will not have created a
link order, which means that we will not have seen this
input section in _bfd_coff_final_link, which means that
we will not have allocated space for the line numbers of
this section. I don't think line numbers can be
meaningful for a section which does not have
SEC_HAS_CONTENTS set, but, if they do, this must be
changed. */
if (o->lineno_count == 0
|| (o->output_section->flags & SEC_HAS_CONTENTS) == 0)
continue;
if (bfd_seek (input_bfd, o->line_filepos, SEEK_SET) != 0
|| bfd_bread (flaginfo->linenos, linesz * o->lineno_count,
input_bfd) != linesz * o->lineno_count)
return false;
offset = o->output_section->vma + o->output_offset - o->vma;
eline = flaginfo->linenos;
oeline = flaginfo->linenos;
elineend = eline + linesz * o->lineno_count;
skipping = false;
for (; eline < elineend; eline += linesz)
{
struct internal_lineno iline;
bfd_coff_swap_lineno_in (input_bfd, eline, &iline);
if (iline.l_lnno != 0)
iline.l_addr.l_paddr += offset;
else if (iline.l_addr.l_symndx >= 0
&& ((unsigned long) iline.l_addr.l_symndx
< obj_raw_syment_count (input_bfd)))
{
long indx;
indx = flaginfo->sym_indices[iline.l_addr.l_symndx];
if (indx < 0)
{
/* These line numbers are attached to a symbol
which we are stripping. We must discard the
line numbers because reading them back with
no associated symbol (or associating them all
with symbol #0) will fail. We can't regain
the space in the output file, but at least
they're dense. */
skipping = true;
}
else
{
struct internal_syment is;
union internal_auxent ia;
/* Fix up the lnnoptr field in the aux entry of
the symbol. It turns out that we can't do
this when we modify the symbol aux entries,
because gas sometimes screws up the lnnoptr
field and makes it an offset from the start
of the line numbers rather than an absolute
file index. */
bfd_coff_swap_sym_in (output_bfd,
(flaginfo->outsyms
+ ((indx - syment_base)
* osymesz)), &is);
if ((ISFCN (is.n_type)
|| is.n_sclass == C_BLOCK)
&& is.n_numaux >= 1)
{
void *auxptr;
auxptr = (flaginfo->outsyms
+ ((indx - syment_base + 1)
* osymesz));
bfd_coff_swap_aux_in (output_bfd, auxptr,
is.n_type, is.n_sclass,
0, is.n_numaux, &ia);
ia.x_sym.x_fcnary.x_fcn.x_lnnoptr =
(o->output_section->line_filepos
+ o->output_section->lineno_count * linesz
+ eline - flaginfo->linenos);
bfd_coff_swap_aux_out (output_bfd, &ia,
is.n_type, is.n_sclass, 0,
is.n_numaux, auxptr);
}
skipping = false;
}
iline.l_addr.l_symndx = indx;
}
if (!skipping)
{
bfd_coff_swap_lineno_out (output_bfd, &iline, oeline);
oeline += linesz;
}
}
pos = o->output_section->line_filepos;
pos += o->output_section->lineno_count * linesz;
amt = oeline - flaginfo->linenos;
if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo->linenos, amt, output_bfd) != amt)
return false;
o->output_section->lineno_count += amt / linesz;
}
}
/* If we swapped out a C_FILE symbol, guess that the next C_FILE
symbol will be the first symbol in the next input file. In the
normal case, this will save us from writing out the C_FILE symbol
again. */
if (flaginfo->last_file_index != -1
&& (bfd_size_type) flaginfo->last_file_index >= syment_base)
{
flaginfo->last_file.n_value = output_index;
bfd_coff_swap_sym_out (output_bfd, &flaginfo->last_file,
(flaginfo->outsyms
+ ((flaginfo->last_file_index - syment_base)
* osymesz)));
}
/* Write the modified symbols to the output file. */
if (outsym > flaginfo->outsyms)
{
file_ptr pos;
bfd_size_type amt;
pos = obj_sym_filepos (output_bfd) + syment_base * osymesz;
amt = outsym - flaginfo->outsyms;
if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo->outsyms, amt, output_bfd) != amt)
return false;
BFD_ASSERT ((obj_raw_syment_count (output_bfd)
+ (outsym - flaginfo->outsyms) / osymesz)
== output_index);
obj_raw_syment_count (output_bfd) = output_index;
}
/* Relocate the contents of each section. */
adjust_symndx = coff_backend_info (input_bfd)->_bfd_coff_adjust_symndx;
for (o = input_bfd->sections; o != NULL; o = o->next)
{
bfd_byte *contents;
struct coff_section_tdata *secdata;
if (! o->linker_mark)
/* This section was omitted from the link. */
continue;
if ((o->flags & SEC_LINKER_CREATED) != 0)
continue;
if ((o->flags & SEC_HAS_CONTENTS) == 0
|| (o->size == 0 && (o->flags & SEC_RELOC) == 0))
{
if ((o->flags & SEC_RELOC) != 0
&& o->reloc_count != 0)
{
_bfd_error_handler
/* xgettext: c-format */
(_("%pB: relocs in section `%pA', but it has no contents"),
input_bfd, o);
bfd_set_error (bfd_error_no_contents);
return false;
}
continue;
}
secdata = coff_section_data (input_bfd, o);
if (secdata != NULL && secdata->contents != NULL)
contents = secdata->contents;
else
{
contents = flaginfo->contents;
if (! bfd_get_full_section_contents (input_bfd, o, &contents))
return false;
}
if ((o->flags & SEC_RELOC) != 0)
{
int target_index;
struct internal_reloc *internal_relocs;
struct internal_reloc *irel;
/* Read in the relocs. */
target_index = o->output_section->target_index;
internal_relocs = (_bfd_coff_read_internal_relocs
(input_bfd, o, false, flaginfo->external_relocs,
bfd_link_relocatable (flaginfo->info),
(bfd_link_relocatable (flaginfo->info)
? (flaginfo->section_info[target_index].relocs
+ o->output_section->reloc_count)
: flaginfo->internal_relocs)));
if (internal_relocs == NULL
&& o->reloc_count > 0)
return false;
/* Run through the relocs looking for relocs against symbols
coming from discarded sections and complain about them. */
irel = internal_relocs;
for (; irel < &internal_relocs[o->reloc_count]; irel++)
{
struct coff_link_hash_entry *h;
asection *ps = NULL;
long symndx = irel->r_symndx;
if (symndx < 0)
continue;
h = obj_coff_sym_hashes (input_bfd)[symndx];
if (h == NULL)
continue;
while (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning)
h = (struct coff_link_hash_entry *) h->root.u.i.link;
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
ps = h->root.u.def.section;
if (ps == NULL)
continue;
/* Complain if definition comes from an excluded section. */
if (ps->flags & SEC_EXCLUDE)
(*flaginfo->info->callbacks->einfo)
/* xgettext: c-format */
(_("%X`%s' referenced in section `%pA' of %pB: "
"defined in discarded section `%pA' of %pB\n"),
h->root.root.string, o, input_bfd, ps, ps->owner);
}
/* Call processor specific code to relocate the section
contents. */
if (! bfd_coff_relocate_section (output_bfd, flaginfo->info,
input_bfd, o,
contents,
internal_relocs,
flaginfo->internal_syms,
flaginfo->sec_ptrs))
return false;
if (bfd_link_relocatable (flaginfo->info))
{
bfd_vma offset;
struct internal_reloc *irelend;
struct coff_link_hash_entry **rel_hash;
offset = o->output_section->vma + o->output_offset - o->vma;
irel = internal_relocs;
irelend = irel + o->reloc_count;
rel_hash = (flaginfo->section_info[target_index].rel_hashes
+ o->output_section->reloc_count);
for (; irel < irelend; irel++, rel_hash++)
{
struct coff_link_hash_entry *h;
bool adjusted;
*rel_hash = NULL;
/* Adjust the reloc address and symbol index. */
irel->r_vaddr += offset;
if (irel->r_symndx == -1)
continue;
if (adjust_symndx)
{
if (! (*adjust_symndx) (output_bfd, flaginfo->info,
input_bfd, o, irel,
&adjusted))
return false;
if (adjusted)
continue;
}
h = obj_coff_sym_hashes (input_bfd)[irel->r_symndx];
if (h != NULL)
{
/* This is a global symbol. */
if (h->indx >= 0)
irel->r_symndx = h->indx;
else
{
/* This symbol is being written at the end
of the file, and we do not yet know the
symbol index. We save the pointer to the
hash table entry in the rel_hash list.
We set the indx field to -2 to indicate
that this symbol must not be stripped. */
*rel_hash = h;
h->indx = -2;
}
}
else
{
long indx;
indx = flaginfo->sym_indices[irel->r_symndx];
if (indx != -1)
irel->r_symndx = indx;
else
{
struct internal_syment *is;
const char *name;
char buf[SYMNMLEN + 1];
/* This reloc is against a symbol we are
stripping. This should have been handled
by the 'dont_skip_symbol' code in the while
loop at the top of this function. */
is = flaginfo->internal_syms + irel->r_symndx;
name = (_bfd_coff_internal_syment_name
(input_bfd, is, buf));
if (name == NULL)
return false;
(*flaginfo->info->callbacks->unattached_reloc)
(flaginfo->info, name, input_bfd, o, irel->r_vaddr);
}
}
}
o->output_section->reloc_count += o->reloc_count;
}
}
/* Write out the modified section contents. */
if (secdata == NULL || secdata->stab_info == NULL)
{
file_ptr loc = (o->output_offset
* bfd_octets_per_byte (output_bfd, o));
if (! bfd_set_section_contents (output_bfd, o->output_section,
contents, loc, o->size))
return false;
}
else
{
if (! (_bfd_write_section_stabs
(output_bfd, &coff_hash_table (flaginfo->info)->stab_info,
o, &secdata->stab_info, contents)))
return false;
}
}
if (! flaginfo->info->keep_memory
&& ! _bfd_coff_free_symbols (input_bfd))
return false;
return true;
}
/* Write out a global symbol. Called via bfd_hash_traverse. */
bool
_bfd_coff_write_global_sym (struct bfd_hash_entry *bh, void *data)
{
struct coff_link_hash_entry *h = (struct coff_link_hash_entry *) bh;
struct coff_final_link_info *flaginfo = (struct coff_final_link_info *) data;
bfd *output_bfd;
struct internal_syment isym;
bfd_size_type symesz;
unsigned int i;
file_ptr pos;
output_bfd = flaginfo->output_bfd;
if (h->root.type == bfd_link_hash_warning)
{
h = (struct coff_link_hash_entry *) h->root.u.i.link;
if (h->root.type == bfd_link_hash_new)
return true;
}
if (h->indx >= 0)
return true;
if (h->indx != -2
&& (flaginfo->info->strip == strip_all
|| (flaginfo->info->strip == strip_some
&& (bfd_hash_lookup (flaginfo->info->keep_hash,
h->root.root.string, false, false)
== NULL))))
return true;
switch (h->root.type)
{
default:
case bfd_link_hash_new:
case bfd_link_hash_warning:
abort ();
return false;
case bfd_link_hash_undefined:
if (h->indx == -3)
return true;
/* Fall through. */
case bfd_link_hash_undefweak:
isym.n_scnum = N_UNDEF;
isym.n_value = 0;
break;
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
{
asection *sec;
sec = h->root.u.def.section->output_section;
if (bfd_is_abs_section (sec))
isym.n_scnum = N_ABS;
else
isym.n_scnum = sec->target_index;
isym.n_value = (h->root.u.def.value
+ h->root.u.def.section->output_offset);
if (! obj_pe (flaginfo->output_bfd))
isym.n_value += sec->vma;
#ifdef BFD64
if (isym.n_value > (bfd_vma) 0xffffffff)
{
if (! h->root.linker_def)
_bfd_error_handler
(_("%pB: stripping non-representable symbol '%s' (value "
"%" BFD_VMA_FMT "x)"),
output_bfd, h->root.root.string, isym.n_value);
return true;
}
#endif
}
break;
case bfd_link_hash_common:
isym.n_scnum = N_UNDEF;
isym.n_value = h->root.u.c.size;
break;
case bfd_link_hash_indirect:
/* Just ignore these. They can't be handled anyhow. */
return true;
}
if (strlen (h->root.root.string) <= SYMNMLEN)
strncpy (isym._n._n_name, h->root.root.string, SYMNMLEN);
else
{
bool hash;
bfd_size_type indx;
hash = true;
if (flaginfo->info->traditional_format)
hash = false;
indx = _bfd_stringtab_add (flaginfo->strtab, h->root.root.string, hash,
false);
if (indx == (bfd_size_type) -1)
{
flaginfo->failed = true;
return false;
}
isym._n._n_n._n_zeroes = 0;
isym._n._n_n._n_offset = STRING_SIZE_SIZE + indx;
}
isym.n_sclass = h->symbol_class;
isym.n_type = h->type;
if (isym.n_sclass == C_NULL)
isym.n_sclass = C_EXT;
/* If doing task linking and this is the pass where we convert
defined globals to statics, then do that conversion now. If the
symbol is not being converted, just ignore it and it will be
output during a later pass. */
if (flaginfo->global_to_static)
{
if (! IS_EXTERNAL (output_bfd, isym))
return true;
isym.n_sclass = C_STAT;
}
/* When a weak symbol is not overridden by a strong one,
turn it into an external symbol when not building a
shared or relocatable object. */
if (! bfd_link_pic (flaginfo->info)
&& ! bfd_link_relocatable (flaginfo->info)
&& IS_WEAK_EXTERNAL (flaginfo->output_bfd, isym))
isym.n_sclass = C_EXT;
isym.n_numaux = h->numaux;
bfd_coff_swap_sym_out (output_bfd, &isym, flaginfo->outsyms);
symesz = bfd_coff_symesz (output_bfd);
pos = obj_sym_filepos (output_bfd);
pos += obj_raw_syment_count (output_bfd) * symesz;
if (bfd_seek (output_bfd, pos, SEEK_SET) != 0
|| bfd_bwrite (flaginfo->outsyms, symesz, output_bfd) != symesz)
{
flaginfo->failed = true;
return false;
}
h->indx = obj_raw_syment_count (output_bfd);
++obj_raw_syment_count (output_bfd);
/* Write out any associated aux entries. Most of the aux entries
will have been modified in _bfd_coff_link_input_bfd. We have to
handle section aux entries here, now that we have the final
relocation and line number counts. */
for (i = 0; i < isym.n_numaux; i++)
{
union internal_auxent *auxp;
auxp = h->aux + i;
/* Look for a section aux entry here using the same tests that
coff_swap_aux_out uses. */
if (i == 0
&& (isym.n_sclass == C_STAT
|| isym.n_sclass == C_HIDDEN)
&& isym.n_type == T_NULL
&& (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak))
{
asection *sec;
sec = h->root.u.def.section->output_section;
if (sec != NULL)
{
auxp->x_scn.x_scnlen = sec->size;
/* For PE, an overflow on the final link reportedly does
not matter. FIXME: Why not? */
if (sec->reloc_count > 0xffff
&& (! obj_pe (output_bfd)
|| bfd_link_relocatable (flaginfo->info)))
_bfd_error_handler
/* xgettext: c-format */
(_("%pB: %pA: reloc overflow: %#x > 0xffff"),
output_bfd, sec, sec->reloc_count);
if (sec->lineno_count > 0xffff
&& (! obj_pe (output_bfd)
|| bfd_link_relocatable (flaginfo->info)))
_bfd_error_handler
/* xgettext: c-format */
(_("%pB: warning: %pA: line number overflow: %#x > 0xffff"),
output_bfd, sec, sec->lineno_count);
auxp->x_scn.x_nreloc = sec->reloc_count;
auxp->x_scn.x_nlinno = sec->lineno_count;
auxp->x_scn.x_checksum = 0;
auxp->x_scn.x_associated = 0;
auxp->x_scn.x_comdat = 0;
}
}
bfd_coff_swap_aux_out (output_bfd, auxp, isym.n_type,
isym.n_sclass, (int) i, isym.n_numaux,
flaginfo->outsyms);
if (bfd_bwrite (flaginfo->outsyms, symesz, output_bfd) != symesz)
{
flaginfo->failed = true;
return false;
}
++obj_raw_syment_count (output_bfd);
}
return true;
}
/* Write out task global symbols, converting them to statics. Called
via coff_link_hash_traverse. Calls bfd_coff_write_global_sym to do
the dirty work, if the symbol we are processing needs conversion. */
bool
_bfd_coff_write_task_globals (struct coff_link_hash_entry *h, void *data)
{
struct coff_final_link_info *flaginfo = (struct coff_final_link_info *) data;
bool rtnval = true;
bool save_global_to_static;
if (h->root.type == bfd_link_hash_warning)
h = (struct coff_link_hash_entry *) h->root.u.i.link;
if (h->indx < 0)
{
switch (h->root.type)
{
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
save_global_to_static = flaginfo->global_to_static;
flaginfo->global_to_static = true;
rtnval = _bfd_coff_write_global_sym (&h->root.root, data);
flaginfo->global_to_static = save_global_to_static;
break;
default:
break;
}
}
return (rtnval);
}
/* Handle a link order which is supposed to generate a reloc. */
bool
_bfd_coff_reloc_link_order (bfd *output_bfd,
struct coff_final_link_info *flaginfo,
asection *output_section,
struct bfd_link_order *link_order)
{
reloc_howto_type *howto;
struct internal_reloc *irel;
struct coff_link_hash_entry **rel_hash_ptr;
howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
if (howto == NULL)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
if (link_order->u.reloc.p->addend != 0)
{
bfd_size_type size;
bfd_byte *buf;
bfd_reloc_status_type rstat;
bool ok;
file_ptr loc;
size = bfd_get_reloc_size (howto);
buf = (bfd_byte *) bfd_zmalloc (size);
if (buf == NULL && size != 0)
return false;
rstat = _bfd_relocate_contents (howto, output_bfd,
(bfd_vma) link_order->u.reloc.p->addend,
buf);
switch (rstat)
{
case bfd_reloc_ok:
break;
default:
case bfd_reloc_outofrange:
abort ();
case bfd_reloc_overflow:
(*flaginfo->info->callbacks->reloc_overflow)
(flaginfo->info, NULL,
(link_order->type == bfd_section_reloc_link_order
? bfd_section_name (link_order->u.reloc.p->u.section)
: link_order->u.reloc.p->u.name),
howto->name, link_order->u.reloc.p->addend,
(bfd *) NULL, (asection *) NULL, (bfd_vma) 0);
break;
}
loc = link_order->offset * bfd_octets_per_byte (output_bfd,
output_section);
ok = bfd_set_section_contents (output_bfd, output_section, buf,
loc, size);
free (buf);
if (! ok)
return false;
}
/* Store the reloc information in the right place. It will get
swapped and written out at the end of the final_link routine. */
irel = (flaginfo->section_info[output_section->target_index].relocs
+ output_section->reloc_count);
rel_hash_ptr = (flaginfo->section_info[output_section->target_index].rel_hashes
+ output_section->reloc_count);
memset (irel, 0, sizeof (struct internal_reloc));
*rel_hash_ptr = NULL;
irel->r_vaddr = output_section->vma + link_order->offset;
if (link_order->type == bfd_section_reloc_link_order)
{
/* We need to somehow locate a symbol in the right section. The
symbol must either have a value of zero, or we must adjust
the addend by the value of the symbol. FIXME: Write this
when we need it. The old linker couldn't handle this anyhow. */
abort ();
*rel_hash_ptr = NULL;
irel->r_symndx = 0;
}
else
{
struct coff_link_hash_entry *h;
h = ((struct coff_link_hash_entry *)
bfd_wrapped_link_hash_lookup (output_bfd, flaginfo->info,
link_order->u.reloc.p->u.name,
false, false, true));
if (h != NULL)
{
if (h->indx >= 0)
irel->r_symndx = h->indx;
else
{
/* Set the index to -2 to force this symbol to get
written out. */
h->indx = -2;
*rel_hash_ptr = h;
irel->r_symndx = 0;
}
}
else
{
(*flaginfo->info->callbacks->unattached_reloc)
(flaginfo->info, link_order->u.reloc.p->u.name,
(bfd *) NULL, (asection *) NULL, (bfd_vma) 0);
irel->r_symndx = 0;
}
}
/* FIXME: Is this always right? */
irel->r_type = howto->type;
/* r_size is only used on the RS/6000, which needs its own linker
routines anyhow. r_extern is only used for ECOFF. */
/* FIXME: What is the right value for r_offset? Is zero OK? */
++output_section->reloc_count;
return true;
}
/* A basic reloc handling routine which may be used by processors with
simple relocs. */
bool
_bfd_coff_generic_relocate_section (bfd *output_bfd,
struct bfd_link_info *info,
bfd *input_bfd,
asection *input_section,
bfd_byte *contents,
struct internal_reloc *relocs,
struct internal_syment *syms,
asection **sections)
{
struct internal_reloc *rel;
struct internal_reloc *relend;
rel = relocs;
relend = rel + input_section->reloc_count;
for (; rel < relend; rel++)
{
long symndx;
struct coff_link_hash_entry *h;
struct internal_syment *sym;
bfd_vma addend;
bfd_vma val;
asection *sec;
reloc_howto_type *howto;
bfd_reloc_status_type rstat;
symndx = rel->r_symndx;
if (symndx == -1)
{
h = NULL;
sym = NULL;
}
else if (symndx < 0
|| (unsigned long) symndx >= obj_raw_syment_count (input_bfd))
{
_bfd_error_handler
/* xgettext: c-format */
(_("%pB: illegal symbol index %ld in relocs"), input_bfd, symndx);
return false;
}
else
{
h = obj_coff_sym_hashes (input_bfd)[symndx];
sym = syms + symndx;
}
/* COFF treats common symbols in one of two ways. Either the
size of the symbol is included in the section contents, or it
is not. We assume that the size is not included, and force
the rtype_to_howto function to adjust the addend as needed. */
if (sym != NULL && sym->n_scnum != 0)
addend = - sym->n_value;
else
addend = 0;
howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h,
sym, &addend);
if (howto == NULL)
return false;
/* If we are doing a relocatable link, then we can just ignore
a PC relative reloc that is pcrel_offset. It will already
have the correct value. If this is not a relocatable link,
then we should ignore the symbol value. */
if (howto->pc_relative && howto->pcrel_offset)
{
if (bfd_link_relocatable (info))
continue;
if (sym != NULL && sym->n_scnum != 0)
addend += sym->n_value;
}
val = 0;
sec = NULL;
if (h == NULL)
{
if (symndx == -1)
{
sec = bfd_abs_section_ptr;
val = 0;
}
else
{
sec = sections[symndx];
/* PR 19623: Relocations against symbols in
the absolute sections should ignored. */
if (bfd_is_abs_section (sec))
continue;
val = (sec->output_section->vma
+ sec->output_offset
+ sym->n_value);
if (! obj_pe (input_bfd))
val -= sec->vma;
}
}
else
{
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
/* Defined weak symbols are a GNU extension. */
sec = h->root.u.def.section;
val = (h->root.u.def.value
+ sec->output_section->vma
+ sec->output_offset);
}
else if (h->root.type == bfd_link_hash_undefweak)
{
if (h->symbol_class == C_NT_WEAK && h->numaux == 1)
{
/* See _Microsoft Portable Executable and Common Object
File Format Specification_, section 5.5.3.
Note that weak symbols without aux records are a GNU
extension.
FIXME: All weak externals are treated as having
characteristic IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY (1).
These behave as per SVR4 ABI: A library member
will resolve a weak external only if a normal
external causes the library member to be linked.
See also linker.c: generic_link_check_archive_element. */
struct coff_link_hash_entry *h2 =
h->auxbfd->tdata.coff_obj_data->sym_hashes[
h->aux->x_sym.x_tagndx.l];
if (!h2 || h2->root.type == bfd_link_hash_undefined)
{
sec = bfd_abs_section_ptr;
val = 0;
}
else
{
sec = h2->root.u.def.section;
val = h2->root.u.def.value
+ sec->output_section->vma + sec->output_offset;
}
}
else
/* This is a GNU extension. */
val = 0;
}
else if (! bfd_link_relocatable (info))
{
(*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd, input_section,
rel->r_vaddr - input_section->vma, true);
/* Stop the linker from issueing errors about truncated relocs
referencing this undefined symbol by giving it an address
that should be in range. */
val = input_section->output_section->vma;
}
}
/* If the input section defining the symbol has been discarded
then zero this reloc field. */
if (sec != NULL && discarded_section (sec))
{
_bfd_clear_contents (howto, input_bfd, input_section,
contents, rel->r_vaddr - input_section->vma);
continue;
}
if (info->base_file)
{
/* Emit a reloc if the backend thinks it needs it. */
if (sym && pe_data (output_bfd)->in_reloc_p (output_bfd, howto))
{
/* Relocation to a symbol in a section which isn't
absolute. We output the address here to a file.
This file is then read by dlltool when generating the
reloc section. Note that the base file is not
portable between systems. We write out a bfd_vma here,
and dlltool reads in a bfd_vma. */
bfd_vma addr = (rel->r_vaddr
- input_section->vma
+ input_section->output_offset
+ input_section->output_section->vma);
if (coff_data (output_bfd)->pe)
addr -= pe_data(output_bfd)->pe_opthdr.ImageBase;
if (fwrite (&addr, 1, sizeof (bfd_vma), (FILE *) info->base_file)
!= sizeof (bfd_vma))
{
bfd_set_error (bfd_error_system_call);
return false;
}
}
}
rstat = _bfd_final_link_relocate (howto, input_bfd, input_section,
contents,
rel->r_vaddr - input_section->vma,
val, addend);
switch (rstat)
{
default:
abort ();
case bfd_reloc_ok:
break;
case bfd_reloc_outofrange:
_bfd_error_handler
/* xgettext: c-format */
(_("%pB: bad reloc address %#" PRIx64 " in section `%pA'"),
input_bfd, (uint64_t) rel->r_vaddr, input_section);
return false;
case bfd_reloc_overflow:
{
/* Ignore any weak undef symbols that may have overflowed. Due to
PR ld/19011 the base address is now in the upper 64-bit address
range. This means that when _bfd_final_link_relocate calculates
the overlow it takes the distance between the symbol and the VMA
which will now always overflow as 0 - 64-bit addr > 32-bit range
of the relocation. This ends up creating PR ld/26659. */
if (val == 0
/* Reverse the hack where 4 is subtracted from the addend. */
&& (addend + 4) == 0
&& sym->n_sclass == C_NT_WEAK
&& bfd_coff_classify_symbol (output_bfd, sym)
== COFF_SYMBOL_UNDEFINED)
break;
const char *name;
char buf[SYMNMLEN + 1];
if (symndx == -1)
name = "*ABS*";
else if (h != NULL)
name = NULL;
else
{
name = _bfd_coff_internal_syment_name (input_bfd, sym, buf);
if (name == NULL)
return false;
}
(*info->callbacks->reloc_overflow)
(info, (h ? &h->root : NULL), name, howto->name,
(bfd_vma) 0, input_bfd, input_section,
rel->r_vaddr - input_section->vma);
}
}
}
return true;
}
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