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/* Mach-O support for BFD.
Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
2009, 2010, 2011, 2012
Free Software Foundation, Inc.
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. */
#include "sysdep.h"
#include "mach-o.h"
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
#include "aout/stab_gnu.h"
#include "mach-o/reloc.h"
#include "mach-o/external.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#define bfd_mach_o_object_p bfd_mach_o_gen_object_p
#define bfd_mach_o_core_p bfd_mach_o_gen_core_p
#define bfd_mach_o_mkobject bfd_mach_o_gen_mkobject
#define FILE_ALIGN(off, algn) \
(((off) + ((file_ptr) 1 << (algn)) - 1) & ((file_ptr) -1 << (algn)))
unsigned int
bfd_mach_o_version (bfd *abfd)
{
bfd_mach_o_data_struct *mdata = NULL;
BFD_ASSERT (bfd_mach_o_valid (abfd));
mdata = bfd_mach_o_get_data (abfd);
return mdata->header.version;
}
bfd_boolean
bfd_mach_o_valid (bfd *abfd)
{
if (abfd == NULL || abfd->xvec == NULL)
return FALSE;
if (abfd->xvec->flavour != bfd_target_mach_o_flavour)
return FALSE;
if (bfd_mach_o_get_data (abfd) == NULL)
return FALSE;
return TRUE;
}
static INLINE bfd_boolean
mach_o_wide_p (bfd_mach_o_header *header)
{
switch (header->version)
{
case 1:
return FALSE;
case 2:
return TRUE;
default:
BFD_FAIL ();
return FALSE;
}
}
static INLINE bfd_boolean
bfd_mach_o_wide_p (bfd *abfd)
{
return mach_o_wide_p (&bfd_mach_o_get_data (abfd)->header);
}
/* Tables to translate well known Mach-O segment/section names to bfd
names. Use of canonical names (such as .text or .debug_frame) is required
by gdb. */
/* __TEXT Segment. */
static const mach_o_section_name_xlat text_section_names_xlat[] =
{
{ ".text", "__text",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS, 0},
{ ".const", "__const",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".static_const", "__static_const",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".cstring", "__cstring",
SEC_READONLY | SEC_DATA | SEC_LOAD | SEC_MERGE | SEC_STRINGS,
BFD_MACH_O_S_CSTRING_LITERALS,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".literal4", "__literal4",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_4BYTE_LITERALS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".literal8", "__literal8",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_8BYTE_LITERALS,
BFD_MACH_O_S_ATTR_NONE, 3},
{ ".literal16", "__literal16",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_16BYTE_LITERALS,
BFD_MACH_O_S_ATTR_NONE, 4},
{ ".constructor", "__constructor",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".destructor", "__destructor",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".eh_frame", "__eh_frame",
SEC_READONLY | SEC_DATA | SEC_LOAD, BFD_MACH_O_S_COALESCED,
BFD_MACH_O_S_ATTR_LIVE_SUPPORT
| BFD_MACH_O_S_ATTR_STRIP_STATIC_SYMS
| BFD_MACH_O_S_ATTR_NO_TOC, 2},
{ NULL, NULL, 0, 0, 0, 0}
};
/* __DATA Segment. */
static const mach_o_section_name_xlat data_section_names_xlat[] =
{
{ ".data", "__data",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".bss", "__bss",
SEC_NO_FLAGS, BFD_MACH_O_S_ZEROFILL,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".const_data", "__const",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".static_data", "__static_data",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".mod_init_func", "__mod_init_func",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_MOD_INIT_FUNC_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".mod_term_func", "__mod_term_func",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_MOD_FINI_FUNC_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".dyld", "__dyld",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 0},
{ ".cfstring", "__cfstring",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NONE, 2},
{ NULL, NULL, 0, 0, 0, 0}
};
/* __DWARF Segment. */
static const mach_o_section_name_xlat dwarf_section_names_xlat[] =
{
{ ".debug_frame", "__debug_frame",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_info", "__debug_info",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_abbrev", "__debug_abbrev",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_aranges", "__debug_aranges",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_macinfo", "__debug_macinfo",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_line", "__debug_line",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_loc", "__debug_loc",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_pubnames", "__debug_pubnames",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_pubtypes", "__debug_pubtypes",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_str", "__debug_str",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_ranges", "__debug_ranges",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ ".debug_macro", "__debug_macro",
SEC_DEBUGGING, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_DEBUG, 0},
{ NULL, NULL, 0, 0, 0, 0}
};
/* __OBJC Segment. */
static const mach_o_section_name_xlat objc_section_names_xlat[] =
{
{ ".objc_class", "__class",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_meta_class", "__meta_class",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_cat_cls_meth", "__cat_cls_meth",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_cat_inst_meth", "__cat_inst_meth",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_protocol", "__protocol",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_string_object", "__string_object",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_cls_meth", "__cls_meth",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_inst_meth", "__inst_meth",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_cls_refs", "__cls_refs",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LITERAL_POINTERS,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_message_refs", "__message_refs",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LITERAL_POINTERS,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_symbols", "__symbols",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_category", "__category",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_class_vars", "__class_vars",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_instance_vars", "__instance_vars",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_module_info", "__module_info",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_selector_strs", "__selector_strs",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_CSTRING_LITERALS,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_image_info", "__image_info",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc_selector_fixup", "__sel_fixup",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
/* Objc V1 */
{ ".objc1_class_ext", "__class_ext",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc1_property_list", "__property",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ ".objc1_protocol_ext", "__protocol_ext",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_REGULAR,
BFD_MACH_O_S_ATTR_NO_DEAD_STRIP, 0},
{ NULL, NULL, 0, 0, 0, 0}
};
static const mach_o_segment_name_xlat segsec_names_xlat[] =
{
{ "__TEXT", text_section_names_xlat },
{ "__DATA", data_section_names_xlat },
{ "__DWARF", dwarf_section_names_xlat },
{ "__OBJC", objc_section_names_xlat },
{ NULL, NULL }
};
static const char dsym_subdir[] = ".dSYM/Contents/Resources/DWARF";
/* For both cases bfd-name => mach-o name and vice versa, the specific target
is checked before the generic. This allows a target (e.g. ppc for cstring)
to override the generic definition with a more specific one. */
/* Fetch the translation from a Mach-O section designation (segment, section)
as a bfd short name, if one exists. Otherwise return NULL.
Allow the segment and section names to be unterminated 16 byte arrays. */
const mach_o_section_name_xlat *
bfd_mach_o_section_data_for_mach_sect (bfd *abfd, const char *segname,
const char *sectname)
{
const struct mach_o_segment_name_xlat *seg;
const mach_o_section_name_xlat *sec;
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
/* First try any target-specific translations defined... */
if (bed->segsec_names_xlat)
for (seg = bed->segsec_names_xlat; seg->segname; seg++)
if (strncmp (seg->segname, segname, BFD_MACH_O_SEGNAME_SIZE) == 0)
for (sec = seg->sections; sec->mach_o_name; sec++)
if (strncmp (sec->mach_o_name, sectname,
BFD_MACH_O_SECTNAME_SIZE) == 0)
return sec;
/* ... and then the Mach-O generic ones. */
for (seg = segsec_names_xlat; seg->segname; seg++)
if (strncmp (seg->segname, segname, BFD_MACH_O_SEGNAME_SIZE) == 0)
for (sec = seg->sections; sec->mach_o_name; sec++)
if (strncmp (sec->mach_o_name, sectname,
BFD_MACH_O_SECTNAME_SIZE) == 0)
return sec;
return NULL;
}
/* If the bfd_name for this section is a 'canonical' form for which we
know the Mach-O data, return the segment name and the data for the
Mach-O equivalent. Otherwise return NULL. */
const mach_o_section_name_xlat *
bfd_mach_o_section_data_for_bfd_name (bfd *abfd, const char *bfd_name,
const char **segname)
{
const struct mach_o_segment_name_xlat *seg;
const mach_o_section_name_xlat *sec;
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
*segname = NULL;
if (bfd_name[0] != '.')
return NULL;
/* First try any target-specific translations defined... */
if (bed->segsec_names_xlat)
for (seg = bed->segsec_names_xlat; seg->segname; seg++)
for (sec = seg->sections; sec->bfd_name; sec++)
if (strcmp (bfd_name, sec->bfd_name) == 0)
{
*segname = seg->segname;
return sec;
}
/* ... and then the Mach-O generic ones. */
for (seg = segsec_names_xlat; seg->segname; seg++)
for (sec = seg->sections; sec->bfd_name; sec++)
if (strcmp (bfd_name, sec->bfd_name) == 0)
{
*segname = seg->segname;
return sec;
}
return NULL;
}
/* Convert Mach-O section name to BFD.
Try to use standard/canonical names, for which we have tables including
default flag settings - which are returned. Otherwise forge a new name
in the form "<segmentname>.<sectionname>" this will be prefixed with
LC_SEGMENT. if the segment name does not begin with an underscore.
SEGNAME and SECTNAME are 16 byte arrays (they do not need to be NUL-
terminated if the name length is exactly 16 bytes - but must be if the name
length is less than 16 characters). */
void
bfd_mach_o_convert_section_name_to_bfd (bfd *abfd, const char *segname,
const char *secname, const char **name,
flagword *flags)
{
const mach_o_section_name_xlat *xlat;
char *res;
unsigned int len;
const char *pfx = "";
*name = NULL;
*flags = SEC_NO_FLAGS;
/* First search for a canonical name...
xlat will be non-null if there is an entry for segname, secname. */
xlat = bfd_mach_o_section_data_for_mach_sect (abfd, segname, secname);
if (xlat)
{
len = strlen (xlat->bfd_name);
res = bfd_alloc (abfd, len+1);
if (res == NULL)
return;
memcpy (res, xlat->bfd_name, len+1);
*name = res;
*flags = xlat->bfd_flags;
return;
}
/* ... else we make up a bfd name from the segment concatenated with the
section. */
len = 16 + 1 + 16 + 1;
/* Put "LC_SEGMENT." prefix if the segment name is weird (ie doesn't start
with an underscore. */
if (segname[0] != '_')
{
static const char seg_pfx[] = "LC_SEGMENT.";
pfx = seg_pfx;
len += sizeof (seg_pfx) - 1;
}
res = bfd_alloc (abfd, len);
if (res == NULL)
return;
snprintf (res, len, "%s%.16s.%.16s", pfx, segname, secname);
*name = res;
}
/* Convert a bfd section name to a Mach-O segment + section name.
If the name is a canonical one for which we have a Darwin match
return the translation table - which contains defaults for flags,
type, attribute and default alignment data.
Otherwise, expand the bfd_name (assumed to be in the form
"[LC_SEGMENT.]<segmentname>.<sectionname>") and return NULL. */
static const mach_o_section_name_xlat *
bfd_mach_o_convert_section_name_to_mach_o (bfd *abfd ATTRIBUTE_UNUSED,
asection *sect,
bfd_mach_o_section *section)
{
const mach_o_section_name_xlat *xlat;
const char *name = bfd_get_section_name (abfd, sect);
const char *segname;
const char *dot;
unsigned int len;
unsigned int seglen;
unsigned int seclen;
memset (section->segname, 0, BFD_MACH_O_SEGNAME_SIZE + 1);
memset (section->sectname, 0, BFD_MACH_O_SECTNAME_SIZE + 1);
/* See if is a canonical name ... */
xlat = bfd_mach_o_section_data_for_bfd_name (abfd, name, &segname);
if (xlat)
{
strcpy (section->segname, segname);
strcpy (section->sectname, xlat->mach_o_name);
return xlat;
}
/* .. else we convert our constructed one back to Mach-O.
Strip LC_SEGMENT. prefix, if present. */
if (strncmp (name, "LC_SEGMENT.", 11) == 0)
name += 11;
/* Find a dot. */
dot = strchr (name, '.');
len = strlen (name);
/* Try to split name into segment and section names. */
if (dot && dot != name)
{
seglen = dot - name;
seclen = len - (dot + 1 - name);
if (seglen < 16 && seclen < 16)
{
memcpy (section->segname, name, seglen);
section->segname[seglen] = 0;
memcpy (section->sectname, dot + 1, seclen);
section->sectname[seclen] = 0;
return NULL;
}
}
/* The segment and section names are both missing - don't make them
into dots. */
if (dot && dot == name)
return NULL;
/* Just duplicate the name into both segment and section. */
if (len > 16)
len = 16;
memcpy (section->segname, name, len);
section->segname[len] = 0;
memcpy (section->sectname, name, len);
section->sectname[len] = 0;
return NULL;
}
/* Return the size of an entry for section SEC.
Must be called only for symbol pointer section and symbol stubs
sections. */
unsigned int
bfd_mach_o_section_get_entry_size (bfd *abfd, bfd_mach_o_section *sec)
{
switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK)
{
case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS:
return bfd_mach_o_wide_p (abfd) ? 8 : 4;
case BFD_MACH_O_S_SYMBOL_STUBS:
return sec->reserved2;
default:
BFD_FAIL ();
return 0;
}
}
/* Return the number of indirect symbols for a section.
Must be called only for symbol pointer section and symbol stubs
sections. */
unsigned int
bfd_mach_o_section_get_nbr_indirect (bfd *abfd, bfd_mach_o_section *sec)
{
unsigned int elsz;
elsz = bfd_mach_o_section_get_entry_size (abfd, sec);
if (elsz == 0)
return 0;
else
return sec->size / elsz;
}
/* Copy any private info we understand from the input symbol
to the output symbol. */
bfd_boolean
bfd_mach_o_bfd_copy_private_symbol_data (bfd *ibfd ATTRIBUTE_UNUSED,
asymbol *isymbol,
bfd *obfd ATTRIBUTE_UNUSED,
asymbol *osymbol)
{
bfd_mach_o_asymbol *os, *is;
os = (bfd_mach_o_asymbol *)osymbol;
is = (bfd_mach_o_asymbol *)isymbol;
os->n_type = is->n_type;
os->n_sect = is->n_sect;
os->n_desc = is->n_desc;
os->symbol.udata.i = is->symbol.udata.i;
return TRUE;
}
/* Copy any private info we understand from the input section
to the output section. */
bfd_boolean
bfd_mach_o_bfd_copy_private_section_data (bfd *ibfd ATTRIBUTE_UNUSED,
asection *isection,
bfd *obfd ATTRIBUTE_UNUSED,
asection *osection)
{
if (osection->used_by_bfd == NULL)
osection->used_by_bfd = isection->used_by_bfd;
else
if (isection->used_by_bfd != NULL)
memcpy (osection->used_by_bfd, isection->used_by_bfd,
sizeof (bfd_mach_o_section));
if (osection->used_by_bfd != NULL)
((bfd_mach_o_section *)osection->used_by_bfd)->bfdsection = osection;
return TRUE;
}
/* Copy any private info we understand from the input bfd
to the output bfd. */
bfd_boolean
bfd_mach_o_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
{
if (bfd_get_flavour (ibfd) != bfd_target_mach_o_flavour
|| bfd_get_flavour (obfd) != bfd_target_mach_o_flavour)
return TRUE;
BFD_ASSERT (bfd_mach_o_valid (ibfd));
BFD_ASSERT (bfd_mach_o_valid (obfd));
/* FIXME: copy commands. */
return TRUE;
}
/* This allows us to set up to 32 bits of flags (unless we invent some
fiendish scheme to subdivide). For now, we'll just set the file flags
without error checking - just overwrite. */
bfd_boolean
bfd_mach_o_bfd_set_private_flags (bfd *abfd, flagword flags)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
if (!mdata)
return FALSE;
mdata->header.flags = flags;
return TRUE;
}
/* Count the total number of symbols. */
static long
bfd_mach_o_count_symbols (bfd *abfd)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
if (mdata->symtab == NULL)
return 0;
return mdata->symtab->nsyms;
}
long
bfd_mach_o_get_symtab_upper_bound (bfd *abfd)
{
long nsyms = bfd_mach_o_count_symbols (abfd);
return ((nsyms + 1) * sizeof (asymbol *));
}
long
bfd_mach_o_canonicalize_symtab (bfd *abfd, asymbol **alocation)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
long nsyms = bfd_mach_o_count_symbols (abfd);
bfd_mach_o_symtab_command *sym = mdata->symtab;
unsigned long j;
if (nsyms < 0)
return nsyms;
if (nsyms == 0)
{
/* Do not try to read symbols if there are none. */
alocation[0] = NULL;
return 0;
}
if (!bfd_mach_o_read_symtab_symbols (abfd))
{
(*_bfd_error_handler)
(_("bfd_mach_o_canonicalize_symtab: unable to load symbols"));
return 0;
}
BFD_ASSERT (sym->symbols != NULL);
for (j = 0; j < sym->nsyms; j++)
alocation[j] = &sym->symbols[j].symbol;
alocation[j] = NULL;
return nsyms;
}
/* Create synthetic symbols for indirect symbols. */
long
bfd_mach_o_get_synthetic_symtab (bfd *abfd,
long symcount ATTRIBUTE_UNUSED,
asymbol **syms ATTRIBUTE_UNUSED,
long dynsymcount ATTRIBUTE_UNUSED,
asymbol **dynsyms ATTRIBUTE_UNUSED,
asymbol **ret)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
bfd_mach_o_dysymtab_command *dysymtab = mdata->dysymtab;
bfd_mach_o_symtab_command *symtab = mdata->symtab;
asymbol *s;
unsigned long count, i, j, n;
size_t size;
char *names;
char *nul_name;
*ret = NULL;
/* Stop now if no symbols or no indirect symbols. */
if (dysymtab == NULL || symtab == NULL || symtab->symbols == NULL)
return 0;
if (dysymtab->nindirectsyms == 0)
return 0;
/* We need to allocate a bfd symbol for every indirect symbol and to
allocate the memory for its name. */
count = dysymtab->nindirectsyms;
size = count * sizeof (asymbol) + 1;
for (j = 0; j < count; j++)
{
unsigned int isym = dysymtab->indirect_syms[j];
/* Some indirect symbols are anonymous. */
if (isym < symtab->nsyms && symtab->symbols[isym].symbol.name)
size += strlen (symtab->symbols[isym].symbol.name) + sizeof ("$stub");
}
s = *ret = (asymbol *) bfd_malloc (size);
if (s == NULL)
return -1;
names = (char *) (s + count);
nul_name = names;
*names++ = 0;
n = 0;
for (i = 0; i < mdata->nsects; i++)
{
bfd_mach_o_section *sec = mdata->sections[i];
unsigned int first, last;
bfd_vma addr;
bfd_vma entry_size;
switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK)
{
case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_SYMBOL_STUBS:
/* Only these sections have indirect symbols. */
first = sec->reserved1;
last = first + bfd_mach_o_section_get_nbr_indirect (abfd, sec);
addr = sec->addr;
entry_size = bfd_mach_o_section_get_entry_size (abfd, sec);
for (j = first; j < last; j++)
{
unsigned int isym = dysymtab->indirect_syms[j];
s->flags = BSF_GLOBAL | BSF_SYNTHETIC;
s->section = sec->bfdsection;
s->value = addr - sec->addr;
s->udata.p = NULL;
if (isym < symtab->nsyms
&& symtab->symbols[isym].symbol.name)
{
const char *sym = symtab->symbols[isym].symbol.name;
size_t len;
s->name = names;
len = strlen (sym);
memcpy (names, sym, len);
names += len;
memcpy (names, "$stub", sizeof ("$stub"));
names += sizeof ("$stub");
}
else
s->name = nul_name;
addr += entry_size;
s++;
n++;
}
break;
default:
break;
}
}
return n;
}
void
bfd_mach_o_get_symbol_info (bfd *abfd ATTRIBUTE_UNUSED,
asymbol *symbol,
symbol_info *ret)
{
bfd_symbol_info (symbol, ret);
}
void
bfd_mach_o_print_symbol (bfd *abfd,
void * afile,
asymbol *symbol,
bfd_print_symbol_type how)
{
FILE *file = (FILE *) afile;
const char *name;
bfd_mach_o_asymbol *asym = (bfd_mach_o_asymbol *)symbol;
switch (how)
{
case bfd_print_symbol_name:
fprintf (file, "%s", symbol->name);
break;
default:
bfd_print_symbol_vandf (abfd, (void *) file, symbol);
if (asym->n_type & BFD_MACH_O_N_STAB)
name = bfd_get_stab_name (asym->n_type);
else
switch (asym->n_type & BFD_MACH_O_N_TYPE)
{
case BFD_MACH_O_N_UNDF:
if (symbol->value == 0)
name = "UND";
else
name = "COM";
break;
case BFD_MACH_O_N_ABS:
name = "ABS";
break;
case BFD_MACH_O_N_INDR:
name = "INDR";
break;
case BFD_MACH_O_N_PBUD:
name = "PBUD";
break;
case BFD_MACH_O_N_SECT:
name = "SECT";
break;
default:
name = "???";
break;
}
if (name == NULL)
name = "";
fprintf (file, " %02x %-6s %02x %04x",
asym->n_type, name, asym->n_sect, asym->n_desc);
if ((asym->n_type & BFD_MACH_O_N_STAB) == 0
&& (asym->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_SECT)
fprintf (file, " [%s]", symbol->section->name);
fprintf (file, " %s", symbol->name);
}
}
static void
bfd_mach_o_convert_architecture (bfd_mach_o_cpu_type mtype,
bfd_mach_o_cpu_subtype msubtype,
enum bfd_architecture *type,
unsigned long *subtype)
{
*subtype = bfd_arch_unknown;
switch (mtype)
{
case BFD_MACH_O_CPU_TYPE_VAX:
*type = bfd_arch_vax;
break;
case BFD_MACH_O_CPU_TYPE_MC680x0:
*type = bfd_arch_m68k;
break;
case BFD_MACH_O_CPU_TYPE_I386:
*type = bfd_arch_i386;
*subtype = bfd_mach_i386_i386;
break;
case BFD_MACH_O_CPU_TYPE_X86_64:
*type = bfd_arch_i386;
*subtype = bfd_mach_x86_64;
break;
case BFD_MACH_O_CPU_TYPE_MIPS:
*type = bfd_arch_mips;
break;
case BFD_MACH_O_CPU_TYPE_MC98000:
*type = bfd_arch_m98k;
break;
case BFD_MACH_O_CPU_TYPE_HPPA:
*type = bfd_arch_hppa;
break;
case BFD_MACH_O_CPU_TYPE_ARM:
*type = bfd_arch_arm;
switch (msubtype)
{
case BFD_MACH_O_CPU_SUBTYPE_ARM_V4T:
*subtype = bfd_mach_arm_4T;
break;
case BFD_MACH_O_CPU_SUBTYPE_ARM_V6:
*subtype = bfd_mach_arm_4T; /* Best fit ? */
break;
case BFD_MACH_O_CPU_SUBTYPE_ARM_V5TEJ:
*subtype = bfd_mach_arm_5TE;
break;
case BFD_MACH_O_CPU_SUBTYPE_ARM_XSCALE:
*subtype = bfd_mach_arm_XScale;
break;
case BFD_MACH_O_CPU_SUBTYPE_ARM_V7:
*subtype = bfd_mach_arm_5TE; /* Best fit ? */
break;
case BFD_MACH_O_CPU_SUBTYPE_ARM_ALL:
default:
break;
}
break;
case BFD_MACH_O_CPU_TYPE_MC88000:
*type = bfd_arch_m88k;
break;
case BFD_MACH_O_CPU_TYPE_SPARC:
*type = bfd_arch_sparc;
*subtype = bfd_mach_sparc;
break;
case BFD_MACH_O_CPU_TYPE_I860:
*type = bfd_arch_i860;
break;
case BFD_MACH_O_CPU_TYPE_ALPHA:
*type = bfd_arch_alpha;
break;
case BFD_MACH_O_CPU_TYPE_POWERPC:
*type = bfd_arch_powerpc;
*subtype = bfd_mach_ppc;
break;
case BFD_MACH_O_CPU_TYPE_POWERPC_64:
*type = bfd_arch_powerpc;
*subtype = bfd_mach_ppc64;
break;
default:
*type = bfd_arch_unknown;
break;
}
}
static bfd_boolean
bfd_mach_o_write_header (bfd *abfd, bfd_mach_o_header *header)
{
struct mach_o_header_external raw;
unsigned int size;
size = mach_o_wide_p (header) ?
BFD_MACH_O_HEADER_64_SIZE : BFD_MACH_O_HEADER_SIZE;
bfd_h_put_32 (abfd, header->magic, raw.magic);
bfd_h_put_32 (abfd, header->cputype, raw.cputype);
bfd_h_put_32 (abfd, header->cpusubtype, raw.cpusubtype);
bfd_h_put_32 (abfd, header->filetype, raw.filetype);
bfd_h_put_32 (abfd, header->ncmds, raw.ncmds);
bfd_h_put_32 (abfd, header->sizeofcmds, raw.sizeofcmds);
bfd_h_put_32 (abfd, header->flags, raw.flags);
if (mach_o_wide_p (header))
bfd_h_put_32 (abfd, header->reserved, raw.reserved);
if (bfd_seek (abfd, 0, SEEK_SET) != 0
|| bfd_bwrite (&raw, size, abfd) != size)
return FALSE;
return TRUE;
}
static int
bfd_mach_o_write_thread (bfd *abfd, bfd_mach_o_load_command *command)
{
bfd_mach_o_thread_command *cmd = &command->command.thread;
unsigned int i;
struct mach_o_thread_command_external raw;
unsigned int offset;
BFD_ASSERT ((command->type == BFD_MACH_O_LC_THREAD)
|| (command->type == BFD_MACH_O_LC_UNIXTHREAD));
offset = 8;
for (i = 0; i < cmd->nflavours; i++)
{
BFD_ASSERT ((cmd->flavours[i].size % 4) == 0);
BFD_ASSERT (cmd->flavours[i].offset ==
(command->offset + offset + BFD_MACH_O_LC_SIZE));
bfd_h_put_32 (abfd, cmd->flavours[i].flavour, raw.flavour);
bfd_h_put_32 (abfd, (cmd->flavours[i].size / 4), raw.count);
if (bfd_seek (abfd, command->offset + offset, SEEK_SET) != 0
|| bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return -1;
offset += cmd->flavours[i].size + sizeof (raw);
}
return 0;
}
long
bfd_mach_o_get_reloc_upper_bound (bfd *abfd ATTRIBUTE_UNUSED,
asection *asect)
{
return (asect->reloc_count + 1) * sizeof (arelent *);
}
/* In addition to the need to byte-swap the symbol number, the bit positions
of the fields in the relocation information vary per target endian-ness. */
static void
bfd_mach_o_swap_in_non_scattered_reloc (bfd *abfd, bfd_mach_o_reloc_info *rel,
unsigned char *fields)
{
unsigned char info = fields[3];
if (bfd_big_endian (abfd))
{
rel->r_value = (fields[0] << 16) | (fields[1] << 8) | fields[2];
rel->r_type = (info >> BFD_MACH_O_BE_TYPE_SHIFT) & BFD_MACH_O_TYPE_MASK;
rel->r_pcrel = (info & BFD_MACH_O_BE_PCREL) ? 1 : 0;
rel->r_length = (info >> BFD_MACH_O_BE_LENGTH_SHIFT)
& BFD_MACH_O_LENGTH_MASK;
rel->r_extern = (info & BFD_MACH_O_BE_EXTERN) ? 1 : 0;
}
else
{
rel->r_value = (fields[2] << 16) | (fields[1] << 8) | fields[0];
rel->r_type = (info >> BFD_MACH_O_LE_TYPE_SHIFT) & BFD_MACH_O_TYPE_MASK;
rel->r_pcrel = (info & BFD_MACH_O_LE_PCREL) ? 1 : 0;
rel->r_length = (info >> BFD_MACH_O_LE_LENGTH_SHIFT)
& BFD_MACH_O_LENGTH_MASK;
rel->r_extern = (info & BFD_MACH_O_LE_EXTERN) ? 1 : 0;
}
}
static int
bfd_mach_o_canonicalize_one_reloc (bfd *abfd,
struct mach_o_reloc_info_external *raw,
arelent *res, asymbol **syms)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
bfd_mach_o_reloc_info reloc;
bfd_vma addr;
asymbol **sym;
addr = bfd_get_32 (abfd, raw->r_address);
res->sym_ptr_ptr = NULL;
res->addend = 0;
if (addr & BFD_MACH_O_SR_SCATTERED)
{
unsigned int j;
bfd_vma symnum = bfd_get_32 (abfd, raw->r_symbolnum);
/* Scattered relocation, can't be extern. */
reloc.r_scattered = 1;
reloc.r_extern = 0;
/* Extract section and offset from r_value (symnum). */
reloc.r_value = symnum;
/* FIXME: This breaks when a symbol in a reloc exactly follows the
end of the data for the section (e.g. in a calculation of section
data length). At present, the symbol will end up associated with
the following section or, if it falls within alignment padding, as
null - which will assert later. */
for (j = 0; j < mdata->nsects; j++)
{
bfd_mach_o_section *sect = mdata->sections[j];
if (symnum >= sect->addr && symnum < sect->addr + sect->size)
{
res->sym_ptr_ptr = sect->bfdsection->symbol_ptr_ptr;
res->addend = symnum - sect->addr;
break;
}
}
/* Extract the info and address fields from r_address. */
reloc.r_type = BFD_MACH_O_GET_SR_TYPE (addr);
reloc.r_length = BFD_MACH_O_GET_SR_LENGTH (addr);
reloc.r_pcrel = addr & BFD_MACH_O_SR_PCREL;
reloc.r_address = BFD_MACH_O_GET_SR_TYPE (addr);
res->address = BFD_MACH_O_GET_SR_ADDRESS (addr);
}
else
{
unsigned int num;
/* Non-scattered relocation. */
reloc.r_scattered = 0;
/* The value and info fields have to be extracted dependent on target
endian-ness. */
bfd_mach_o_swap_in_non_scattered_reloc (abfd, &reloc, raw->r_symbolnum);
num = reloc.r_value;
if (reloc.r_extern)
sym = syms + num;
else if (reloc.r_scattered
|| (reloc.r_type != BFD_MACH_O_GENERIC_RELOC_PAIR))
{
BFD_ASSERT (num != 0);
BFD_ASSERT (num <= mdata->nsects);
sym = mdata->sections[num - 1]->bfdsection->symbol_ptr_ptr;
/* For a symbol defined in section S, the addend (stored in the
binary) contains the address of the section. To comply with
bfd convention, subtract the section address.
Use the address from the header, so that the user can modify
the vma of the section. */
res->addend = -mdata->sections[num - 1]->addr;
}
else /* ... The 'symnum' in a non-scattered PAIR will be 0x00ffffff. */
{
/* Pairs for PPC LO/HI/HA are not scattered, but contain the offset
in the lower 16bits of the address value. So we have to find the
'symbol' from the preceding reloc. We do this even thoough the
section symbol is probably not needed here, because NULL symbol
values cause an assert in generic BFD code. */
sym = (res - 1)->sym_ptr_ptr;
}
res->sym_ptr_ptr = sym;
/* The 'address' is just r_address.
??? maybe this should be masked with 0xffffff for safety. */
res->address = addr;
reloc.r_address = addr;
}
/* We have set up a reloc with all the information present, so the swapper can
modify address, value and addend fields, if necessary, to convey information
in the generic BFD reloc that is mach-o specific. */
if (!(*bed->_bfd_mach_o_swap_reloc_in)(res, &reloc))
return -1;
return 0;
}
static int
bfd_mach_o_canonicalize_relocs (bfd *abfd, unsigned long filepos,
unsigned long count,
arelent *res, asymbol **syms)
{
unsigned long i;
struct mach_o_reloc_info_external *native_relocs;
bfd_size_type native_size;
/* Allocate and read relocs. */
native_size = count * BFD_MACH_O_RELENT_SIZE;
native_relocs =
(struct mach_o_reloc_info_external *) bfd_malloc (native_size);
if (native_relocs == NULL)
return -1;
if (bfd_seek (abfd, filepos, SEEK_SET) != 0
|| bfd_bread (native_relocs, native_size, abfd) != native_size)
goto err;
for (i = 0; i < count; i++)
{
if (bfd_mach_o_canonicalize_one_reloc (abfd, &native_relocs[i],
&res[i], syms) < 0)
goto err;
}
free (native_relocs);
return i;
err:
free (native_relocs);
return -1;
}
long
bfd_mach_o_canonicalize_reloc (bfd *abfd, asection *asect,
arelent **rels, asymbol **syms)
{
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
unsigned long i;
arelent *res;
if (asect->reloc_count == 0)
return 0;
/* No need to go further if we don't know how to read relocs. */
if (bed->_bfd_mach_o_swap_reloc_in == NULL)
return 0;
if (asect->relocation == NULL)
{
res = bfd_malloc (asect->reloc_count * sizeof (arelent));
if (res == NULL)
return -1;
if (bfd_mach_o_canonicalize_relocs (abfd, asect->rel_filepos,
asect->reloc_count, res, syms) < 0)
{
free (res);
return -1;
}
asect->relocation = res;
}
res = asect->relocation;
for (i = 0; i < asect->reloc_count; i++)
rels[i] = &res[i];
rels[i] = NULL;
return i;
}
long
bfd_mach_o_get_dynamic_reloc_upper_bound (bfd *abfd)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
if (mdata->dysymtab == NULL)
return 1;
return (mdata->dysymtab->nextrel + mdata->dysymtab->nlocrel + 1)
* sizeof (arelent *);
}
long
bfd_mach_o_canonicalize_dynamic_reloc (bfd *abfd, arelent **rels,
struct bfd_symbol **syms)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
bfd_mach_o_dysymtab_command *dysymtab = mdata->dysymtab;
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
unsigned long i;
arelent *res;
if (dysymtab == NULL)
return 0;
if (dysymtab->nextrel == 0 && dysymtab->nlocrel == 0)
return 0;
/* No need to go further if we don't know how to read relocs. */
if (bed->_bfd_mach_o_swap_reloc_in == NULL)
return 0;
if (mdata->dyn_reloc_cache == NULL)
{
res = bfd_malloc ((dysymtab->nextrel + dysymtab->nlocrel)
* sizeof (arelent));
if (res == NULL)
return -1;
if (bfd_mach_o_canonicalize_relocs (abfd, dysymtab->extreloff,
dysymtab->nextrel, res, syms) < 0)
{
free (res);
return -1;
}
if (bfd_mach_o_canonicalize_relocs (abfd, dysymtab->locreloff,
dysymtab->nlocrel,
res + dysymtab->nextrel, syms) < 0)
{
free (res);
return -1;
}
mdata->dyn_reloc_cache = res;
}
res = mdata->dyn_reloc_cache;
for (i = 0; i < dysymtab->nextrel + dysymtab->nlocrel; i++)
rels[i] = &res[i];
rels[i] = NULL;
return i;
}
/* In addition to the need to byte-swap the symbol number, the bit positions
of the fields in the relocation information vary per target endian-ness. */
static void
bfd_mach_o_swap_out_non_scattered_reloc (bfd *abfd, unsigned char *fields,
bfd_mach_o_reloc_info *rel)
{
unsigned char info = 0;
BFD_ASSERT (rel->r_type <= 15);
BFD_ASSERT (rel->r_length <= 3);
if (bfd_big_endian (abfd))
{
fields[0] = (rel->r_value >> 16) & 0xff;
fields[1] = (rel->r_value >> 8) & 0xff;
fields[2] = rel->r_value & 0xff;
info |= rel->r_type << BFD_MACH_O_BE_TYPE_SHIFT;
info |= rel->r_pcrel ? BFD_MACH_O_BE_PCREL : 0;
info |= rel->r_length << BFD_MACH_O_BE_LENGTH_SHIFT;
info |= rel->r_extern ? BFD_MACH_O_BE_EXTERN : 0;
}
else
{
fields[2] = (rel->r_value >> 16) & 0xff;
fields[1] = (rel->r_value >> 8) & 0xff;
fields[0] = rel->r_value & 0xff;
info |= rel->r_type << BFD_MACH_O_LE_TYPE_SHIFT;
info |= rel->r_pcrel ? BFD_MACH_O_LE_PCREL : 0;
info |= rel->r_length << BFD_MACH_O_LE_LENGTH_SHIFT;
info |= rel->r_extern ? BFD_MACH_O_LE_EXTERN : 0;
}
fields[3] = info;
}
static bfd_boolean
bfd_mach_o_write_relocs (bfd *abfd, bfd_mach_o_section *section)
{
unsigned int i;
arelent **entries;
asection *sec;
bfd_mach_o_backend_data *bed = bfd_mach_o_get_backend_data (abfd);
sec = section->bfdsection;
if (sec->reloc_count == 0)
return TRUE;
if (bed->_bfd_mach_o_swap_reloc_out == NULL)
return TRUE;
if (bfd_seek (abfd, section->reloff, SEEK_SET) != 0)
return FALSE;
/* Convert and write. */
entries = section->bfdsection->orelocation;
for (i = 0; i < section->nreloc; i++)
{
arelent *rel = entries[i];
struct mach_o_reloc_info_external raw;
bfd_mach_o_reloc_info info, *pinfo = &info;
/* Convert relocation to an intermediate representation. */
if (!(*bed->_bfd_mach_o_swap_reloc_out) (rel, pinfo))
return FALSE;
/* Lower the relocation info. */
if (pinfo->r_scattered)
{
unsigned long v;
v = BFD_MACH_O_SR_SCATTERED
| (pinfo->r_pcrel ? BFD_MACH_O_SR_PCREL : 0)
| BFD_MACH_O_SET_SR_LENGTH(pinfo->r_length)
| BFD_MACH_O_SET_SR_TYPE(pinfo->r_type)
| BFD_MACH_O_SET_SR_ADDRESS(pinfo->r_address);
/* Note: scattered relocs have field in reverse order... */
bfd_put_32 (abfd, v, raw.r_address);
bfd_put_32 (abfd, pinfo->r_value, raw.r_symbolnum);
}
else
{
bfd_put_32 (abfd, pinfo->r_address, raw.r_address);
bfd_mach_o_swap_out_non_scattered_reloc (abfd, raw.r_symbolnum,
pinfo);
}
if (bfd_bwrite (&raw, BFD_MACH_O_RELENT_SIZE, abfd)
!= BFD_MACH_O_RELENT_SIZE)
return FALSE;
}
return TRUE;
}
static int
bfd_mach_o_write_section_32 (bfd *abfd, bfd_mach_o_section *section)
{
struct mach_o_section_32_external raw;
memcpy (raw.sectname, section->sectname, 16);
memcpy (raw.segname, section->segname, 16);
bfd_h_put_32 (abfd, section->addr, raw.addr);
bfd_h_put_32 (abfd, section->size, raw.size);
bfd_h_put_32 (abfd, section->offset, raw.offset);
bfd_h_put_32 (abfd, section->align, raw.align);
bfd_h_put_32 (abfd, section->reloff, raw.reloff);
bfd_h_put_32 (abfd, section->nreloc, raw.nreloc);
bfd_h_put_32 (abfd, section->flags, raw.flags);
bfd_h_put_32 (abfd, section->reserved1, raw.reserved1);
bfd_h_put_32 (abfd, section->reserved2, raw.reserved2);
if (bfd_bwrite (&raw, BFD_MACH_O_SECTION_SIZE, abfd)
!= BFD_MACH_O_SECTION_SIZE)
return -1;
return 0;
}
static int
bfd_mach_o_write_section_64 (bfd *abfd, bfd_mach_o_section *section)
{
struct mach_o_section_64_external raw;
memcpy (raw.sectname, section->sectname, 16);
memcpy (raw.segname, section->segname, 16);
bfd_h_put_64 (abfd, section->addr, raw.addr);
bfd_h_put_64 (abfd, section->size, raw.size);
bfd_h_put_32 (abfd, section->offset, raw.offset);
bfd_h_put_32 (abfd, section->align, raw.align);
bfd_h_put_32 (abfd, section->reloff, raw.reloff);
bfd_h_put_32 (abfd, section->nreloc, raw.nreloc);
bfd_h_put_32 (abfd, section->flags, raw.flags);
bfd_h_put_32 (abfd, section->reserved1, raw.reserved1);
bfd_h_put_32 (abfd, section->reserved2, raw.reserved2);
bfd_h_put_32 (abfd, section->reserved3, raw.reserved3);
if (bfd_bwrite (&raw, BFD_MACH_O_SECTION_64_SIZE, abfd)
!= BFD_MACH_O_SECTION_64_SIZE)
return -1;
return 0;
}
static int
bfd_mach_o_write_segment_32 (bfd *abfd, bfd_mach_o_load_command *command)
{
struct mach_o_segment_command_32_external raw;
bfd_mach_o_segment_command *seg = &command->command.segment;
bfd_mach_o_section *sec;
BFD_ASSERT (command->type == BFD_MACH_O_LC_SEGMENT);
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
if (!bfd_mach_o_write_relocs (abfd, sec))
return -1;
memcpy (raw.segname, seg->segname, 16);
bfd_h_put_32 (abfd, seg->vmaddr, raw.vmaddr);
bfd_h_put_32 (abfd, seg->vmsize, raw.vmsize);
bfd_h_put_32 (abfd, seg->fileoff, raw.fileoff);
bfd_h_put_32 (abfd, seg->filesize, raw.filesize);
bfd_h_put_32 (abfd, seg->maxprot, raw.maxprot);
bfd_h_put_32 (abfd, seg->initprot, raw.initprot);
bfd_h_put_32 (abfd, seg->nsects, raw.nsects);
bfd_h_put_32 (abfd, seg->flags, raw.flags);
if (bfd_seek (abfd, command->offset + BFD_MACH_O_LC_SIZE, SEEK_SET) != 0
|| bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return -1;
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
if (bfd_mach_o_write_section_32 (abfd, sec))
return -1;
return 0;
}
static int
bfd_mach_o_write_segment_64 (bfd *abfd, bfd_mach_o_load_command *command)
{
struct mach_o_segment_command_64_external raw;
bfd_mach_o_segment_command *seg = &command->command.segment;
bfd_mach_o_section *sec;
BFD_ASSERT (command->type == BFD_MACH_O_LC_SEGMENT_64);
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
if (!bfd_mach_o_write_relocs (abfd, sec))
return -1;
memcpy (raw.segname, seg->segname, 16);
bfd_h_put_64 (abfd, seg->vmaddr, raw.vmaddr);
bfd_h_put_64 (abfd, seg->vmsize, raw.vmsize);
bfd_h_put_64 (abfd, seg->fileoff, raw.fileoff);
bfd_h_put_64 (abfd, seg->filesize, raw.filesize);
bfd_h_put_32 (abfd, seg->maxprot, raw.maxprot);
bfd_h_put_32 (abfd, seg->initprot, raw.initprot);
bfd_h_put_32 (abfd, seg->nsects, raw.nsects);
bfd_h_put_32 (abfd, seg->flags, raw.flags);
if (bfd_seek (abfd, command->offset + BFD_MACH_O_LC_SIZE, SEEK_SET) != 0
|| bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return -1;
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
if (bfd_mach_o_write_section_64 (abfd, sec))
return -1;
return 0;
}
static bfd_boolean
bfd_mach_o_write_symtab (bfd *abfd, bfd_mach_o_load_command *command)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
bfd_mach_o_symtab_command *sym = &command->command.symtab;
unsigned long i;
unsigned int wide = bfd_mach_o_wide_p (abfd);
unsigned int symlen = wide ? BFD_MACH_O_NLIST_64_SIZE : BFD_MACH_O_NLIST_SIZE;
struct bfd_strtab_hash *strtab;
asymbol **symbols = bfd_get_outsymbols (abfd);
BFD_ASSERT (command->type == BFD_MACH_O_LC_SYMTAB);
/* Write the symbols first. */
mdata->filelen = FILE_ALIGN(mdata->filelen, wide ? 3 : 2);
sym->symoff = mdata->filelen;
if (bfd_seek (abfd, sym->symoff, SEEK_SET) != 0)
return FALSE;
sym->nsyms = bfd_get_symcount (abfd);
mdata->filelen += sym->nsyms * symlen;
strtab = _bfd_stringtab_init ();
if (strtab == NULL)
return FALSE;
if (sym->nsyms > 0)
/* Although we don't strictly need to do this, for compatibility with
Darwin system tools, actually output an empty string for the index
0 entry. */
_bfd_stringtab_add (strtab, "", TRUE, FALSE);
for (i = 0; i < sym->nsyms; i++)
{
bfd_size_type str_index;
bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *)symbols[i];
if (s->symbol.name == 0 || s->symbol.name[0] == '\0')
/* An index of 0 always means the empty string. */
str_index = 0;
else
{
str_index = _bfd_stringtab_add (strtab, s->symbol.name, TRUE, FALSE);
if (str_index == (bfd_size_type) -1)
goto err;
}
if (wide)
{
struct mach_o_nlist_64_external raw;
bfd_h_put_32 (abfd, str_index, raw.n_strx);
bfd_h_put_8 (abfd, s->n_type, raw.n_type);
bfd_h_put_8 (abfd, s->n_sect, raw.n_sect);
bfd_h_put_16 (abfd, s->n_desc, raw.n_desc);
bfd_h_put_64 (abfd, s->symbol.section->vma + s->symbol.value,
raw.n_value);
if (bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
goto err;
}
else
{
struct mach_o_nlist_external raw;
bfd_h_put_32 (abfd, str_index, raw.n_strx);
bfd_h_put_8 (abfd, s->n_type, raw.n_type);
bfd_h_put_8 (abfd, s->n_sect, raw.n_sect);
bfd_h_put_16 (abfd, s->n_desc, raw.n_desc);
bfd_h_put_32 (abfd, s->symbol.section->vma + s->symbol.value,
raw.n_value);
if (bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
goto err;
}
}
sym->strsize = _bfd_stringtab_size (strtab);
sym->stroff = mdata->filelen;
mdata->filelen += sym->strsize;
if (_bfd_stringtab_emit (abfd, strtab) != TRUE)
goto err;
_bfd_stringtab_free (strtab);
/* The command. */
{
struct mach_o_symtab_command_external raw;
bfd_h_put_32 (abfd, sym->symoff, raw.symoff);
bfd_h_put_32 (abfd, sym->nsyms, raw.nsyms);
bfd_h_put_32 (abfd, sym->stroff, raw.stroff);
bfd_h_put_32 (abfd, sym->strsize, raw.strsize);
if (bfd_seek (abfd, command->offset + BFD_MACH_O_LC_SIZE, SEEK_SET) != 0
|| bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return FALSE;
}
return TRUE;
err:
_bfd_stringtab_free (strtab);
return FALSE;
}
/* Write a dysymtab command.
TODO: Possibly coalesce writes of smaller objects. */
static bfd_boolean
bfd_mach_o_write_dysymtab (bfd *abfd, bfd_mach_o_load_command *command)
{
bfd_mach_o_dysymtab_command *cmd = &command->command.dysymtab;
BFD_ASSERT (command->type == BFD_MACH_O_LC_DYSYMTAB);
if (cmd->nmodtab != 0)
{
unsigned int i;
if (bfd_seek (abfd, cmd->modtaboff, SEEK_SET) != 0)
return FALSE;
for (i = 0; i < cmd->nmodtab; i++)
{
bfd_mach_o_dylib_module *module = &cmd->dylib_module[i];
unsigned int iinit;
unsigned int ninit;
iinit = module->iinit & 0xffff;
iinit |= ((module->iterm & 0xffff) << 16);
ninit = module->ninit & 0xffff;
ninit |= ((module->nterm & 0xffff) << 16);
if (bfd_mach_o_wide_p (abfd))
{
struct mach_o_dylib_module_64_external w;
bfd_h_put_32 (abfd, module->module_name_idx, &w.module_name);
bfd_h_put_32 (abfd, module->iextdefsym, &w.iextdefsym);
bfd_h_put_32 (abfd, module->nextdefsym, &w.nextdefsym);
bfd_h_put_32 (abfd, module->irefsym, &w.irefsym);
bfd_h_put_32 (abfd, module->nrefsym, &w.nrefsym);
bfd_h_put_32 (abfd, module->ilocalsym, &w.ilocalsym);
bfd_h_put_32 (abfd, module->nlocalsym, &w.nlocalsym);
bfd_h_put_32 (abfd, module->iextrel, &w.iextrel);
bfd_h_put_32 (abfd, module->nextrel, &w.nextrel);
bfd_h_put_32 (abfd, iinit, &w.iinit_iterm);
bfd_h_put_32 (abfd, ninit, &w.ninit_nterm);
bfd_h_put_64 (abfd, module->objc_module_info_addr,
&w.objc_module_info_addr);
bfd_h_put_32 (abfd, module->objc_module_info_size,
&w.objc_module_info_size);
if (bfd_bwrite ((void *) &w, sizeof (w), abfd) != sizeof (w))
return FALSE;
}
else
{
struct mach_o_dylib_module_external n;
bfd_h_put_32 (abfd, module->module_name_idx, &n.module_name);
bfd_h_put_32 (abfd, module->iextdefsym, &n.iextdefsym);
bfd_h_put_32 (abfd, module->nextdefsym, &n.nextdefsym);
bfd_h_put_32 (abfd, module->irefsym, &n.irefsym);
bfd_h_put_32 (abfd, module->nrefsym, &n.nrefsym);
bfd_h_put_32 (abfd, module->ilocalsym, &n.ilocalsym);
bfd_h_put_32 (abfd, module->nlocalsym, &n.nlocalsym);
bfd_h_put_32 (abfd, module->iextrel, &n.iextrel);
bfd_h_put_32 (abfd, module->nextrel, &n.nextrel);
bfd_h_put_32 (abfd, iinit, &n.iinit_iterm);
bfd_h_put_32 (abfd, ninit, &n.ninit_nterm);
bfd_h_put_32 (abfd, module->objc_module_info_addr,
&n.objc_module_info_addr);
bfd_h_put_32 (abfd, module->objc_module_info_size,
&n.objc_module_info_size);
if (bfd_bwrite ((void *) &n, sizeof (n), abfd) != sizeof (n))
return FALSE;
}
}
}
if (cmd->ntoc != 0)
{
unsigned int i;
if (bfd_seek (abfd, cmd->tocoff, SEEK_SET) != 0)
return FALSE;
for (i = 0; i < cmd->ntoc; i++)
{
struct mach_o_dylib_table_of_contents_external raw;
bfd_mach_o_dylib_table_of_content *toc = &cmd->dylib_toc[i];
bfd_h_put_32 (abfd, toc->symbol_index, &raw.symbol_index);
bfd_h_put_32 (abfd, toc->module_index, &raw.module_index);
if (bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return FALSE;
}
}
if (cmd->nindirectsyms > 0)
{
unsigned int i;
if (bfd_seek (abfd, cmd->indirectsymoff, SEEK_SET) != 0)
return FALSE;
for (i = 0; i < cmd->nindirectsyms; ++i)
{
unsigned char raw[4];
bfd_h_put_32 (abfd, cmd->indirect_syms[i], &raw);
if (bfd_bwrite (raw, sizeof (raw), abfd) != sizeof (raw))
return FALSE;
}
}
if (cmd->nextrefsyms != 0)
{
unsigned int i;
if (bfd_seek (abfd, cmd->extrefsymoff, SEEK_SET) != 0)
return FALSE;
for (i = 0; i < cmd->nextrefsyms; i++)
{
unsigned long v;
unsigned char raw[4];
bfd_mach_o_dylib_reference *ref = &cmd->ext_refs[i];
/* Fields isym and flags are written as bit-fields, thus we need
a specific processing for endianness. */
if (bfd_big_endian (abfd))
{
v = ((ref->isym & 0xffffff) << 8);
v |= ref->flags & 0xff;
}
else
{
v = ref->isym & 0xffffff;
v |= ((ref->flags & 0xff) << 24);
}
bfd_h_put_32 (abfd, v, raw);
if (bfd_bwrite (raw, sizeof (raw), abfd) != sizeof (raw))
return FALSE;
}
}
/* The command. */
if (bfd_seek (abfd, command->offset + BFD_MACH_O_LC_SIZE, SEEK_SET) != 0)
return FALSE;
else
{
struct mach_o_dysymtab_command_external raw;
bfd_h_put_32 (abfd, cmd->ilocalsym, &raw.ilocalsym);
bfd_h_put_32 (abfd, cmd->nlocalsym, &raw.nlocalsym);
bfd_h_put_32 (abfd, cmd->iextdefsym, &raw.iextdefsym);
bfd_h_put_32 (abfd, cmd->nextdefsym, &raw.nextdefsym);
bfd_h_put_32 (abfd, cmd->iundefsym, &raw.iundefsym);
bfd_h_put_32 (abfd, cmd->nundefsym, &raw.nundefsym);
bfd_h_put_32 (abfd, cmd->tocoff, &raw.tocoff);
bfd_h_put_32 (abfd, cmd->ntoc, &raw.ntoc);
bfd_h_put_32 (abfd, cmd->modtaboff, &raw.modtaboff);
bfd_h_put_32 (abfd, cmd->nmodtab, &raw.nmodtab);
bfd_h_put_32 (abfd, cmd->extrefsymoff, &raw.extrefsymoff);
bfd_h_put_32 (abfd, cmd->nextrefsyms, &raw.nextrefsyms);
bfd_h_put_32 (abfd, cmd->indirectsymoff, &raw.indirectsymoff);
bfd_h_put_32 (abfd, cmd->nindirectsyms, &raw.nindirectsyms);
bfd_h_put_32 (abfd, cmd->extreloff, &raw.extreloff);
bfd_h_put_32 (abfd, cmd->nextrel, &raw.nextrel);
bfd_h_put_32 (abfd, cmd->locreloff, &raw.locreloff);
bfd_h_put_32 (abfd, cmd->nlocrel, &raw.nlocrel);
if (bfd_bwrite (&raw, sizeof (raw), abfd) != sizeof (raw))
return FALSE;
}
return TRUE;
}
static unsigned
bfd_mach_o_primary_symbol_sort_key (bfd_mach_o_asymbol *s)
{
unsigned mtyp = s->n_type & BFD_MACH_O_N_TYPE;
/* Just leave debug symbols where they are (pretend they are local, and
then they will just be sorted on position). */
if (s->n_type & BFD_MACH_O_N_STAB)
return 0;
/* Local (we should never see an undefined local AFAICT). */
if (! (s->n_type & (BFD_MACH_O_N_EXT | BFD_MACH_O_N_PEXT)))
return 0;
/* Common symbols look like undefined externs. */
if (mtyp == BFD_MACH_O_N_UNDF)
return 2;
/* A defined non-local, non-debug symbol. */
return 1;
}
static int
bfd_mach_o_cf_symbols (const void *a, const void *b)
{
bfd_mach_o_asymbol *sa = *(bfd_mach_o_asymbol **) a;
bfd_mach_o_asymbol *sb = *(bfd_mach_o_asymbol **) b;
unsigned int soa, sob;
soa = bfd_mach_o_primary_symbol_sort_key (sa);
sob = bfd_mach_o_primary_symbol_sort_key (sb);
if (soa < sob)
return -1;
if (soa > sob)
return 1;
/* If it's local or stab, just preserve the input order. */
if (soa == 0)
{
if (sa->symbol.udata.i < sb->symbol.udata.i)
return -1;
if (sa->symbol.udata.i > sb->symbol.udata.i)
return 1;
/* This is probably an error. */
return 0;
}
/* The second sort key is name. */
return strcmp (sa->symbol.name, sb->symbol.name);
}
/* Process the symbols.
This should be OK for single-module files - but it is not likely to work
for multi-module shared libraries.
(a) If the application has not filled in the relevant mach-o fields, make
an estimate.
(b) Order them, like this:
( i) local.
(unsorted)
( ii) external defined
(by name)
(iii) external undefined/common
(by name)
( iv) common
(by name)
*/
static bfd_boolean
bfd_mach_o_mangle_symbols (bfd *abfd)
{
unsigned long i;
asymbol **symbols = bfd_get_outsymbols (abfd);
if (symbols == NULL || bfd_get_symcount (abfd) == 0)
return TRUE;
for (i = 0; i < bfd_get_symcount (abfd); i++)
{
bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *)symbols[i];
/* We use this value, which is out-of-range as a symbol index, to signal
that the mach-o-specific data are not filled in and need to be created
from the bfd values. It is much preferable for the application to do
this, since more meaningful diagnostics can be made that way. */
if (s->symbol.udata.i == SYM_MACHO_FIELDS_UNSET)
{
/* No symbol information has been set - therefore determine
it from the bfd symbol flags/info. */
if (s->symbol.section == bfd_abs_section_ptr)
s->n_type = BFD_MACH_O_N_ABS;
else if (s->symbol.section == bfd_und_section_ptr)
{
s->n_type = BFD_MACH_O_N_UNDF;
if (s->symbol.flags & BSF_WEAK)
s->n_desc |= BFD_MACH_O_N_WEAK_REF;
/* mach-o automatically makes undefined symbols extern. */
s->n_type |= BFD_MACH_O_N_EXT;
s->symbol.flags |= BSF_GLOBAL;
}
else if (s->symbol.section == bfd_com_section_ptr)
{
s->n_type = BFD_MACH_O_N_UNDF | BFD_MACH_O_N_EXT;
s->symbol.flags |= BSF_GLOBAL;
}
else
s->n_type = BFD_MACH_O_N_SECT;
if (s->symbol.flags & BSF_GLOBAL)
s->n_type |= BFD_MACH_O_N_EXT;
}
/* Put the section index in, where required. */
if ((s->symbol.section != bfd_abs_section_ptr
&& s->symbol.section != bfd_und_section_ptr
&& s->symbol.section != bfd_com_section_ptr)
|| ((s->n_type & BFD_MACH_O_N_STAB) != 0
&& s->symbol.name == NULL))
s->n_sect = s->symbol.section->target_index;
/* Number to preserve order for local and debug syms. */
s->symbol.udata.i = i;
}
/* Sort the symbols. */
qsort ((void *) symbols, (size_t) bfd_get_symcount (abfd),
sizeof (asymbol *), bfd_mach_o_cf_symbols);
for (i = 0; i < bfd_get_symcount (abfd); ++i)
{
bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *)symbols[i];
s->symbol.udata.i = i; /* renumber. */
}
return TRUE;
}
/* We build a flat table of sections, which can be re-ordered if necessary.
Fill in the section number and other mach-o-specific data. */
static bfd_boolean
bfd_mach_o_mangle_sections (bfd *abfd, bfd_mach_o_data_struct *mdata)
{
asection *sec;
unsigned target_index;
unsigned nsect;
nsect = bfd_count_sections (abfd);
/* Don't do it if it's already set - assume the application knows what it's
doing. */
if (mdata->nsects == nsect
&& (mdata->nsects == 0 || mdata->sections != NULL))
return TRUE;
mdata->nsects = nsect;
mdata->sections = bfd_alloc (abfd,
mdata->nsects * sizeof (bfd_mach_o_section *));
if (mdata->sections == NULL)
return FALSE;
/* We need to check that this can be done... */
if (nsect > 255)
(*_bfd_error_handler) (_("mach-o: there are too many sections (%d)"
" maximum is 255,\n"), nsect);
/* Create Mach-O sections.
Section type, attribute and align should have been set when the
section was created - either read in or specified. */
target_index = 0;
for (sec = abfd->sections; sec; sec = sec->next)
{
unsigned bfd_align = bfd_get_section_alignment (abfd, sec);
bfd_mach_o_section *msect = bfd_mach_o_get_mach_o_section (sec);
mdata->sections[target_index] = msect;
msect->addr = bfd_get_section_vma (abfd, sec);
msect->size = bfd_get_section_size (sec);
/* Use the largest alignment set, in case it was bumped after the
section was created. */
msect->align = msect->align > bfd_align ? msect->align : bfd_align;
msect->offset = 0;
sec->target_index = ++target_index;
}
return TRUE;
}
bfd_boolean
bfd_mach_o_write_contents (bfd *abfd)
{
unsigned int i;
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
/* Make the commands, if not already present. */
if (mdata->header.ncmds == 0)
if (!bfd_mach_o_build_commands (abfd))
return FALSE;
if (!bfd_mach_o_write_header (abfd, &mdata->header))
return FALSE;
for (i = 0; i < mdata->header.ncmds; i++)
{
struct mach_o_load_command_external raw;
bfd_mach_o_load_command *cur = &mdata->commands[i];
unsigned long typeflag;
typeflag = cur->type | (cur->type_required ? BFD_MACH_O_LC_REQ_DYLD : 0);
bfd_h_put_32 (abfd, typeflag, raw.cmd);
bfd_h_put_32 (abfd, cur->len, raw.cmdsize);
if (bfd_seek (abfd, cur->offset, SEEK_SET) != 0
|| bfd_bwrite (&raw, BFD_MACH_O_LC_SIZE, abfd) != 8)
return FALSE;
switch (cur->type)
{
case BFD_MACH_O_LC_SEGMENT:
if (bfd_mach_o_write_segment_32 (abfd, cur) != 0)
return FALSE;
break;
case BFD_MACH_O_LC_SEGMENT_64:
if (bfd_mach_o_write_segment_64 (abfd, cur) != 0)
return FALSE;
break;
case BFD_MACH_O_LC_SYMTAB:
if (!bfd_mach_o_write_symtab (abfd, cur))
return FALSE;
break;
case BFD_MACH_O_LC_DYSYMTAB:
if (!bfd_mach_o_write_dysymtab (abfd, cur))
return FALSE;
break;
case BFD_MACH_O_LC_SYMSEG:
break;
case BFD_MACH_O_LC_THREAD:
case BFD_MACH_O_LC_UNIXTHREAD:
if (bfd_mach_o_write_thread (abfd, cur) != 0)
return FALSE;
break;
case BFD_MACH_O_LC_LOADFVMLIB:
case BFD_MACH_O_LC_IDFVMLIB:
case BFD_MACH_O_LC_IDENT:
case BFD_MACH_O_LC_FVMFILE:
case BFD_MACH_O_LC_PREPAGE:
case BFD_MACH_O_LC_LOAD_DYLIB:
case BFD_MACH_O_LC_LOAD_WEAK_DYLIB:
case BFD_MACH_O_LC_ID_DYLIB:
case BFD_MACH_O_LC_REEXPORT_DYLIB:
case BFD_MACH_O_LC_LOAD_UPWARD_DYLIB:
case BFD_MACH_O_LC_LOAD_DYLINKER:
case BFD_MACH_O_LC_ID_DYLINKER:
case BFD_MACH_O_LC_PREBOUND_DYLIB:
case BFD_MACH_O_LC_ROUTINES:
case BFD_MACH_O_LC_SUB_FRAMEWORK:
break;
default:
(*_bfd_error_handler) (_("unable to write unknown load command 0x%lx"),
(unsigned long) cur->type);
return FALSE;
}
}
return TRUE;
}
static void
bfd_mach_o_append_section_to_segment (bfd_mach_o_segment_command *seg,
asection *sec)
{
bfd_mach_o_section *s = (bfd_mach_o_section *)sec->used_by_bfd;
if (seg->sect_head == NULL)
seg->sect_head = s;
else
seg->sect_tail->next = s;
seg->sect_tail = s;
}
/* Create section Mach-O flags from BFD flags. */
static void
bfd_mach_o_set_section_flags_from_bfd (bfd *abfd ATTRIBUTE_UNUSED, asection *sec)
{
flagword bfd_flags;
bfd_mach_o_section *s = bfd_mach_o_get_mach_o_section (sec);
/* Create default flags. */
bfd_flags = bfd_get_section_flags (abfd, sec);
if ((bfd_flags & SEC_CODE) == SEC_CODE)
s->flags = BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
| BFD_MACH_O_S_ATTR_SOME_INSTRUCTIONS
| BFD_MACH_O_S_REGULAR;
else if ((bfd_flags & (SEC_ALLOC | SEC_LOAD)) == SEC_ALLOC)
s->flags = BFD_MACH_O_S_ZEROFILL;
else if (bfd_flags & SEC_DEBUGGING)
s->flags = BFD_MACH_O_S_REGULAR | BFD_MACH_O_S_ATTR_DEBUG;
else
s->flags = BFD_MACH_O_S_REGULAR;
}
/* Count the number of sections in the list for the segment named.
The special case of NULL or "" for the segment name is valid for
an MH_OBJECT file and means 'all sections available'.
Requires that the sections table in mdata be filled in.
Returns the number of sections (0 is valid).
Any number > 255 signals an invalid section count, although we will,
perhaps, allow the file to be written (in line with Darwin tools up
to XCode 4).
A section count of (unsigned long) -1 signals a definite error. */
static unsigned long
bfd_mach_o_count_sections_for_seg (const char *segment,
bfd_mach_o_data_struct *mdata)
{
unsigned i,j;
if (mdata == NULL || mdata->sections == NULL)
return (unsigned long) -1;
/* The MH_OBJECT case, all sections are considered; Although nsects is
is an unsigned long, the maximum valid section count is 255 and this
will have been checked already by mangle_sections. */
if (segment == NULL || segment[0] == '\0')
return mdata->nsects;
/* Count the number of sections we see in this segment. */
j = 0;
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *s = mdata->sections[i];
if (strncmp (segment, s->segname, BFD_MACH_O_SEGNAME_SIZE) == 0)
j++;
}
return j;
}
static bfd_boolean
bfd_mach_o_build_seg_command (const char *segment,
bfd_mach_o_data_struct *mdata,
bfd_mach_o_segment_command *seg)
{
unsigned i;
int is_mho = (segment == NULL || segment[0] == '\0');
/* Fill segment command. */
if (is_mho)
memset (seg->segname, 0, sizeof (seg->segname));
else
strncpy (seg->segname, segment, sizeof (seg->segname));
/* TODO: fix this up for non-MH_OBJECT cases. */
seg->vmaddr = 0;
seg->vmsize = 0;
seg->fileoff = mdata->filelen;
seg->filesize = 0;
seg->maxprot = BFD_MACH_O_PROT_READ | BFD_MACH_O_PROT_WRITE
| BFD_MACH_O_PROT_EXECUTE;
seg->initprot = seg->maxprot;
seg->flags = 0;
seg->sect_head = NULL;
seg->sect_tail = NULL;
/* Append sections to the segment.
This is a little tedious, we have to honor the need to account zerofill
sections after all the rest. This forces us to do the calculation of
total vmsize in three passes so that any alignment increments are
properly accounted. */
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *s = mdata->sections[i];
asection *sec = s->bfdsection;
/* If we're not making an MH_OBJECT, check whether this section is from
our segment, and skip if not. Otherwise, just add all sections. */
if (! is_mho
&& strncmp (segment, s->segname, BFD_MACH_O_SEGNAME_SIZE) != 0)
continue;
/* Although we account for zerofill section sizes in vm order, they are
placed in the file in source sequence. */
bfd_mach_o_append_section_to_segment (seg, sec);
s->offset = 0;
/* Zerofill sections have zero file size & offset,
and are not written. */
if ((s->flags & BFD_MACH_O_SECTION_TYPE_MASK) == BFD_MACH_O_S_ZEROFILL
|| (s->flags & BFD_MACH_O_SECTION_TYPE_MASK)
== BFD_MACH_O_S_GB_ZEROFILL)
continue;
if (s->size > 0)
{
seg->vmsize = FILE_ALIGN (seg->vmsize, s->align);
seg->vmsize += s->size;
seg->filesize = FILE_ALIGN (seg->filesize, s->align);
seg->filesize += s->size;
mdata->filelen = FILE_ALIGN (mdata->filelen, s->align);
s->offset = mdata->filelen;
}
sec->filepos = s->offset;
mdata->filelen += s->size;
}
/* Now pass through again, for zerofill, only now we just update the vmsize. */
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *s = mdata->sections[i];
if ((s->flags & BFD_MACH_O_SECTION_TYPE_MASK) != BFD_MACH_O_S_ZEROFILL)
continue;
if (! is_mho
&& strncmp (segment, s->segname, BFD_MACH_O_SEGNAME_SIZE) != 0)
continue;
if (s->size > 0)
{
seg->vmsize = FILE_ALIGN (seg->vmsize, s->align);
seg->vmsize += s->size;
}
}
/* Now pass through again, for zerofill_GB. */
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *s = mdata->sections[i];
if ((s->flags & BFD_MACH_O_SECTION_TYPE_MASK) != BFD_MACH_O_S_GB_ZEROFILL)
continue;
if (! is_mho
&& strncmp (segment, s->segname, BFD_MACH_O_SEGNAME_SIZE) != 0)
continue;
if (s->size > 0)
{
seg->vmsize = FILE_ALIGN (seg->vmsize, s->align);
seg->vmsize += s->size;
}
}
/* Allocate space for the relocations. */
mdata->filelen = FILE_ALIGN(mdata->filelen, 2);
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *ms = mdata->sections[i];
asection *sec = ms->bfdsection;
if ((ms->nreloc = sec->reloc_count) == 0)
{
ms->reloff = 0;
continue;
}
sec->rel_filepos = mdata->filelen;
ms->reloff = sec->rel_filepos;
mdata->filelen += sec->reloc_count * BFD_MACH_O_RELENT_SIZE;
}
return TRUE;
}
/* Count the number of indirect symbols in the image.
Requires that the sections are in their final order. */
static unsigned int
bfd_mach_o_count_indirect_symbols (bfd *abfd, bfd_mach_o_data_struct *mdata)
{
unsigned int i;
unsigned int nisyms = 0;
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *sec = mdata->sections[i];
switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK)
{
case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_SYMBOL_STUBS:
nisyms += bfd_mach_o_section_get_nbr_indirect (abfd, sec);
break;
default:
break;
}
}
return nisyms;
}
static bfd_boolean
bfd_mach_o_build_dysymtab_command (bfd *abfd,
bfd_mach_o_data_struct *mdata,
bfd_mach_o_load_command *cmd)
{
bfd_mach_o_dysymtab_command *dsym = &cmd->command.dysymtab;
/* TODO:
We are not going to try and fill these in yet and, moreover, we are
going to bail if they are already set. */
if (dsym->nmodtab != 0
|| dsym->ntoc != 0
|| dsym->nextrefsyms != 0)
{
(*_bfd_error_handler) (_("sorry: modtab, toc and extrefsyms are not yet"
" implemented for dysymtab commands."));
return FALSE;
}
dsym->ilocalsym = 0;
if (bfd_get_symcount (abfd) > 0)
{
asymbol **symbols = bfd_get_outsymbols (abfd);
unsigned long i;
/* Count the number of each kind of symbol. */
for (i = 0; i < bfd_get_symcount (abfd); ++i)
{
bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *)symbols[i];
if (s->n_type & (BFD_MACH_O_N_EXT | BFD_MACH_O_N_PEXT))
break;
}
dsym->nlocalsym = i;
dsym->iextdefsym = i;
for (; i < bfd_get_symcount (abfd); ++i)
{
bfd_mach_o_asymbol *s = (bfd_mach_o_asymbol *)symbols[i];
if ((s->n_type & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_UNDF)
break;
}
dsym->nextdefsym = i - dsym->nlocalsym;
dsym->iundefsym = dsym->nextdefsym + dsym->iextdefsym;
dsym->nundefsym = bfd_get_symcount (abfd)
- dsym->nlocalsym
- dsym->nextdefsym;
}
else
{
dsym->nlocalsym = 0;
dsym->iextdefsym = 0;
dsym->nextdefsym = 0;
dsym->iundefsym = 0;
dsym->nundefsym = 0;
}
dsym->nindirectsyms = bfd_mach_o_count_indirect_symbols (abfd, mdata);
if (dsym->nindirectsyms > 0)
{
unsigned i;
unsigned n;
mdata->filelen = FILE_ALIGN (mdata->filelen, 2);
dsym->indirectsymoff = mdata->filelen;
mdata->filelen += dsym->nindirectsyms * 4;
dsym->indirect_syms = bfd_zalloc (abfd, dsym->nindirectsyms * 4);
if (dsym->indirect_syms == NULL)
return FALSE;
n = 0;
for (i = 0; i < mdata->nsects; ++i)
{
bfd_mach_o_section *sec = mdata->sections[i];
switch (sec->flags & BFD_MACH_O_SECTION_TYPE_MASK)
{
case BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_LAZY_SYMBOL_POINTERS:
case BFD_MACH_O_S_SYMBOL_STUBS:
{
unsigned j, num;
bfd_mach_o_asymbol **isyms = sec->indirect_syms;
num = bfd_mach_o_section_get_nbr_indirect (abfd, sec);
if (isyms == NULL || num == 0)
break;
/* Record the starting index in the reserved1 field. */
sec->reserved1 = n;
for (j = 0; j < num; j++, n++)
{
if (isyms[j] == NULL)
dsym->indirect_syms[n] = BFD_MACH_O_INDIRECT_SYM_LOCAL;
else if (isyms[j]->symbol.section == bfd_abs_section_ptr
&& ! (isyms[j]->n_type & BFD_MACH_O_N_EXT))
dsym->indirect_syms[n] = BFD_MACH_O_INDIRECT_SYM_LOCAL
| BFD_MACH_O_INDIRECT_SYM_ABS;
else
dsym->indirect_syms[n] = isyms[j]->symbol.udata.i;
}
}
break;
default:
break;
}
}
}
return TRUE;
}
/* Build Mach-O load commands (currently assuming an MH_OBJECT file).
TODO: Other file formats, rebuilding symtab/dysymtab commands for strip
and copy functionality. */
bfd_boolean
bfd_mach_o_build_commands (bfd *abfd)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
unsigned wide = mach_o_wide_p (&mdata->header);
int segcmd_idx = -1;
int symtab_idx = -1;
int dysymtab_idx = -1;
unsigned long base_offset = 0;
/* Return now if commands are already present. */
if (mdata->header.ncmds)
return FALSE;
/* Fill in the file type, if not already set. */
if (mdata->header.filetype == 0)
{
if (abfd->flags & EXEC_P)
mdata->header.filetype = BFD_MACH_O_MH_EXECUTE;
else if (abfd->flags & DYNAMIC)
mdata->header.filetype = BFD_MACH_O_MH_DYLIB;
else
mdata->header.filetype = BFD_MACH_O_MH_OBJECT;
}
/* If hasn't already been done, flatten sections list, and sort
if/when required. Must be done before the symbol table is adjusted,
since that depends on properly numbered sections. */
if (mdata->nsects == 0 || mdata->sections == NULL)
if (! bfd_mach_o_mangle_sections (abfd, mdata))
return FALSE;
/* Order the symbol table, fill-in/check mach-o specific fields and
partition out any indirect symbols. */
if (!bfd_mach_o_mangle_symbols (abfd))
return FALSE;
/* Very simple command set (only really applicable to MH_OBJECTs):
All the commands are optional - present only when there is suitable data.
(i.e. it is valid to have an empty file)
a command (segment) to contain all the sections,
command for the symbol table,
a command for the dysymtab.
??? maybe we should assert that this is an MH_OBJECT? */
if (mdata->nsects > 0)
{
segcmd_idx = 0;
mdata->header.ncmds = 1;
}
if (bfd_get_symcount (abfd) > 0)
{
mdata->header.ncmds++;
symtab_idx = segcmd_idx + 1; /* 0 if the seg command is absent. */
}
/* FIXME:
This is a rather crude test for whether we should build a dysymtab. */
if (bfd_mach_o_should_emit_dysymtab ()
&& bfd_get_symcount (abfd))
{
mdata->header.ncmds++;
/* If there should be a case where a dysymtab could be emitted without
a symtab (seems improbable), this would need amending. */
dysymtab_idx = symtab_idx + 1;
}
if (wide)
base_offset = BFD_MACH_O_HEADER_64_SIZE;
else
base_offset = BFD_MACH_O_HEADER_SIZE;
/* Well, we must have a header, at least. */
mdata->filelen = base_offset;
/* A bit unusual, but no content is valid;
as -n empty.s -o empty.o */
if (mdata->header.ncmds == 0)
return TRUE;
mdata->commands = bfd_zalloc (abfd, mdata->header.ncmds
* sizeof (bfd_mach_o_load_command));
if (mdata->commands == NULL)
return FALSE;
if (segcmd_idx >= 0)
{
bfd_mach_o_load_command *cmd = &mdata->commands[segcmd_idx];
bfd_mach_o_segment_command *seg = &cmd->command.segment;
/* Count the segctions in the special blank segment used for MH_OBJECT. */
seg->nsects = bfd_mach_o_count_sections_for_seg (NULL, mdata);
if (seg->nsects == (unsigned long) -1)
return FALSE;
/* Init segment command. */
cmd->offset = base_offset;
if (wide)
{
cmd->type = BFD_MACH_O_LC_SEGMENT_64;
cmd->len = BFD_MACH_O_LC_SEGMENT_64_SIZE
+ BFD_MACH_O_SECTION_64_SIZE * seg->nsects;
}
else
{
cmd->type = BFD_MACH_O_LC_SEGMENT;
cmd->len = BFD_MACH_O_LC_SEGMENT_SIZE
+ BFD_MACH_O_SECTION_SIZE * seg->nsects;
}
cmd->type_required = FALSE;
mdata->header.sizeofcmds = cmd->len;
mdata->filelen += cmd->len;
}
if (symtab_idx >= 0)
{
/* Init symtab command. */
bfd_mach_o_load_command *cmd = &mdata->commands[symtab_idx];
cmd->type = BFD_MACH_O_LC_SYMTAB;
cmd->offset = base_offset;
if (segcmd_idx >= 0)
cmd->offset += mdata->commands[segcmd_idx].len;
cmd->len = sizeof (struct mach_o_symtab_command_external)
+ BFD_MACH_O_LC_SIZE;
cmd->type_required = FALSE;
mdata->header.sizeofcmds += cmd->len;
mdata->filelen += cmd->len;
}
/* If required, setup symtab command, see comment above about the quality
of this test. */
if (dysymtab_idx >= 0)
{
bfd_mach_o_load_command *cmd = &mdata->commands[dysymtab_idx];
cmd->type = BFD_MACH_O_LC_DYSYMTAB;
if (symtab_idx >= 0)
cmd->offset = mdata->commands[symtab_idx].offset
+ mdata->commands[symtab_idx].len;
else if (segcmd_idx >= 0)
cmd->offset = mdata->commands[segcmd_idx].offset
+ mdata->commands[segcmd_idx].len;
else
cmd->offset = base_offset;
cmd->type_required = FALSE;
cmd->len = sizeof (struct mach_o_dysymtab_command_external)
+ BFD_MACH_O_LC_SIZE;
mdata->header.sizeofcmds += cmd->len;
mdata->filelen += cmd->len;
}
/* So, now we have sized the commands and the filelen set to that.
Now we can build the segment command and set the section file offsets. */
if (segcmd_idx >= 0
&& ! bfd_mach_o_build_seg_command
(NULL, mdata, &mdata->commands[segcmd_idx].command.segment))
return FALSE;
/* If we're doing a dysymtab, cmd points to its load command. */
if (dysymtab_idx >= 0
&& ! bfd_mach_o_build_dysymtab_command (abfd, mdata,
&mdata->commands[dysymtab_idx]))
return FALSE;
/* The symtab command is filled in when the symtab is written. */
return TRUE;
}
/* Set the contents of a section. */
bfd_boolean
bfd_mach_o_set_section_contents (bfd *abfd,
asection *section,
const void * location,
file_ptr offset,
bfd_size_type count)
{
file_ptr pos;
/* Trying to write the first section contents will trigger the creation of
the load commands if they are not already present. */
if (! abfd->output_has_begun && ! bfd_mach_o_build_commands (abfd))
return FALSE;
if (count == 0)
return TRUE;
pos = section->filepos + offset;
if (bfd_seek (abfd, pos, SEEK_SET) != 0
|| bfd_bwrite (location, count, abfd) != count)
return FALSE;
return TRUE;
}
int
bfd_mach_o_sizeof_headers (bfd *a ATTRIBUTE_UNUSED,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
return 0;
}
/* Make an empty symbol. This is required only because
bfd_make_section_anyway wants to create a symbol for the section. */
asymbol *
bfd_mach_o_make_empty_symbol (bfd *abfd)
{
asymbol *new_symbol;
new_symbol = bfd_zalloc (abfd, sizeof (bfd_mach_o_asymbol));
if (new_symbol == NULL)
return new_symbol;
new_symbol->the_bfd = abfd;
new_symbol->udata.i = SYM_MACHO_FIELDS_UNSET;
return new_symbol;
}
static bfd_boolean
bfd_mach_o_read_header (bfd *abfd, bfd_mach_o_header *header)
{
struct mach_o_header_external raw;
unsigned int size;
bfd_vma (*get32) (const void *) = NULL;
/* Just read the magic number. */
if (bfd_seek (abfd, 0, SEEK_SET) != 0
|| bfd_bread (raw.magic, sizeof (raw.magic), abfd) != 4)
return FALSE;
if (bfd_getb32 (raw.magic) == BFD_MACH_O_MH_MAGIC)
{
header->byteorder = BFD_ENDIAN_BIG;
header->magic = BFD_MACH_O_MH_MAGIC;
header->version = 1;
get32 = bfd_getb32;
}
else if (bfd_getl32 (raw.magic) == BFD_MACH_O_MH_MAGIC)
{
header->byteorder = BFD_ENDIAN_LITTLE;
header->magic = BFD_MACH_O_MH_MAGIC;
header->version = 1;
get32 = bfd_getl32;
}
else if (bfd_getb32 (raw.magic) == BFD_MACH_O_MH_MAGIC_64)
{
header->byteorder = BFD_ENDIAN_BIG;
header->magic = BFD_MACH_O_MH_MAGIC_64;
header->version = 2;
get32 = bfd_getb32;
}
else if (bfd_getl32 (raw.magic) == BFD_MACH_O_MH_MAGIC_64)
{
header->byteorder = BFD_ENDIAN_LITTLE;
header->magic = BFD_MACH_O_MH_MAGIC_64;
header->version = 2;
get32 = bfd_getl32;
}
else
{
header->byteorder = BFD_ENDIAN_UNKNOWN;
return FALSE;
}
/* Once the size of the header is known, read the full header. */
size = mach_o_wide_p (header) ?
BFD_MACH_O_HEADER_64_SIZE : BFD_MACH_O_HEADER_SIZE;
if (bfd_seek (abfd, 0, SEEK_SET) != 0
|| bfd_bread (&raw, size, abfd) != size)
return FALSE;
header->cputype = (*get32) (raw.cputype);
header->cpusubtype = (*get32) (raw.cpusubtype);
header->filetype = (*get32) (raw.filetype);
header->ncmds = (*get32) (raw.ncmds);
header->sizeofcmds = (*get32) (raw.sizeofcmds);
header->flags = (*get32) (raw.flags);