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pe-dll.c
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pe-dll.c
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/* Routines to help build PEI-format DLLs (Win32 etc)
Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
Written by DJ Delorie <dj@cygnus.com>
This file is part of the GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 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 "bfd.h"
#include "bfdlink.h"
#include "libiberty.h"
#include "filenames.h"
#include "safe-ctype.h"
#include <time.h>
#include "ld.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldwrite.h"
#include "ldmisc.h"
#include <ldgram.h>
#include "ldmain.h"
#include "ldfile.h"
#include "ldemul.h"
#include "coff/internal.h"
#include "../bfd/libcoff.h"
#include "deffile.h"
#ifdef pe_use_x86_64
#define PE_IDATA4_SIZE 8
#define PE_IDATA5_SIZE 8
#include "pep-dll.h"
#undef AOUTSZ
#define AOUTSZ PEPAOUTSZ
#define PEAOUTHDR PEPAOUTHDR
#else
#include "pe-dll.h"
#endif
#ifndef PE_IDATA4_SIZE
#define PE_IDATA4_SIZE 4
#endif
#ifndef PE_IDATA5_SIZE
#define PE_IDATA5_SIZE 4
#endif
/* This file turns a regular Windows PE image into a DLL. Because of
the complexity of this operation, it has been broken down into a
number of separate modules which are all called by the main function
at the end of this file. This function is not re-entrant and is
normally only called once, so static variables are used to reduce
the number of parameters and return values required.
See also: ld/emultempl/pe.em and ld/emultempl/pep.em. */
/* Auto-import feature by Paul Sokolovsky
Quick facts:
1. With this feature on, DLL clients can import variables from DLL
without any concern from their side (for example, without any source
code modifications).
2. This is done completely in bounds of the PE specification (to be fair,
there's a place where it pokes nose out of, but in practice it works).
So, resulting module can be used with any other PE compiler/linker.
3. Auto-import is fully compatible with standard import method and they
can be mixed together.
4. Overheads: space: 8 bytes per imported symbol, plus 20 for each
reference to it; load time: negligible; virtual/physical memory: should be
less than effect of DLL relocation, and I sincerely hope it doesn't affect
DLL sharability (too much).
Idea
The obvious and only way to get rid of dllimport insanity is to make client
access variable directly in the DLL, bypassing extra dereference. I.e.,
whenever client contains something like
mov dll_var,%eax,
address of dll_var in the command should be relocated to point into loaded
DLL. The aim is to make OS loader do so, and than make ld help with that.
Import section of PE made following way: there's a vector of structures
each describing imports from particular DLL. Each such structure points
to two other parallel vectors: one holding imported names, and one which
will hold address of corresponding imported name. So, the solution is
de-vectorize these structures, making import locations be sparse and
pointing directly into code. Before continuing, it is worth a note that,
while authors strives to make PE act ELF-like, there're some other people
make ELF act PE-like: elfvector, ;-) .
Implementation
For each reference of data symbol to be imported from DLL (to set of which
belong symbols with name <sym>, if __imp_<sym> is found in implib), the
import fixup entry is generated. That entry is of type
IMAGE_IMPORT_DESCRIPTOR and stored in .idata$2 subsection. Each
fixup entry contains pointer to symbol's address within .text section
(marked with __fuN_<sym> symbol, where N is integer), pointer to DLL name
(so, DLL name is referenced by multiple entries), and pointer to symbol
name thunk. Symbol name thunk is singleton vector (__nm_th_<symbol>)
pointing to IMAGE_IMPORT_BY_NAME structure (__nm_<symbol>) directly
containing imported name. Here comes that "on the edge" problem mentioned
above: PE specification rambles that name vector (OriginalFirstThunk)
should run in parallel with addresses vector (FirstThunk), i.e. that they
should have same number of elements and terminated with zero. We violate
this, since FirstThunk points directly into machine code. But in practice,
OS loader implemented the sane way: it goes thru OriginalFirstThunk and
puts addresses to FirstThunk, not something else. It once again should be
noted that dll and symbol name structures are reused across fixup entries
and should be there anyway to support standard import stuff, so sustained
overhead is 20 bytes per reference. Other question is whether having several
IMAGE_IMPORT_DESCRIPTORS for the same DLL is possible. Answer is yes, it is
done even by native compiler/linker (libth32's functions are in fact reside
in windows9x kernel32.dll, so if you use it, you have two
IMAGE_IMPORT_DESCRIPTORS for kernel32.dll). Yet other question is whether
referencing the same PE structures several times is valid. The answer is why
not, prohibiting that (detecting violation) would require more work on
behalf of loader than not doing it.
See also: ld/emultempl/pe.em and ld/emultempl/pep.em. */
static void add_bfd_to_link (bfd *, const char *, struct bfd_link_info *);
/* For emultempl/pe.em. */
def_file * pe_def_file = 0;
int pe_dll_export_everything = 0;
int pe_dll_exclude_all_symbols = 0;
int pe_dll_do_default_excludes = 1;
int pe_dll_kill_ats = 0;
int pe_dll_stdcall_aliases = 0;
int pe_dll_warn_dup_exports = 0;
int pe_dll_compat_implib = 0;
int pe_dll_extra_pe_debug = 0;
int pe_use_nul_prefixed_import_tables = 0;
int pe_use_coff_long_section_names = -1;
int pe_leading_underscore = -1;
/* Static variables and types. */
static bfd_vma image_base;
static bfd *filler_bfd;
static struct bfd_section *edata_s, *reloc_s;
static unsigned char *edata_d, *reloc_d;
static size_t edata_sz, reloc_sz;
static int runtime_pseudo_relocs_created = 0;
static int runtime_pseudp_reloc_v2_init = 0;
typedef struct
{
const char *name;
int len;
}
autofilter_entry_type;
typedef struct
{
const char *target_name;
const char *object_target;
unsigned int imagebase_reloc;
int pe_arch;
int bfd_arch;
bfd_boolean underscored;
const autofilter_entry_type* autofilter_symbollist;
}
pe_details_type;
static const autofilter_entry_type autofilter_symbollist_generic[] =
{
{ STRING_COMMA_LEN ("_NULL_IMPORT_DESCRIPTOR") },
/* Entry point symbols. */
{ STRING_COMMA_LEN ("DllMain") },
{ STRING_COMMA_LEN ("DllMainCRTStartup") },
{ STRING_COMMA_LEN ("_DllMainCRTStartup") },
/* Runtime pseudo-reloc. */
{ STRING_COMMA_LEN ("_pei386_runtime_relocator") },
{ STRING_COMMA_LEN ("do_pseudo_reloc") },
{ NULL, 0 }
};
static const autofilter_entry_type autofilter_symbollist_i386[] =
{
{ STRING_COMMA_LEN ("_NULL_IMPORT_DESCRIPTOR") },
/* Entry point symbols, and entry hooks. */
{ STRING_COMMA_LEN ("cygwin_crt0") },
#ifdef pe_use_x86_64
{ STRING_COMMA_LEN ("DllMain") },
{ STRING_COMMA_LEN ("DllEntryPoint") },
{ STRING_COMMA_LEN ("DllMainCRTStartup") },
{ STRING_COMMA_LEN ("_cygwin_dll_entry") },
{ STRING_COMMA_LEN ("_cygwin_crt0_common") },
{ STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry") },
#else
{ STRING_COMMA_LEN ("DllMain@12") },
{ STRING_COMMA_LEN ("DllEntryPoint@0") },
{ STRING_COMMA_LEN ("DllMainCRTStartup@12") },
{ STRING_COMMA_LEN ("_cygwin_dll_entry@12") },
{ STRING_COMMA_LEN ("_cygwin_crt0_common@8") },
{ STRING_COMMA_LEN ("_cygwin_noncygwin_dll_entry@12") },
{ STRING_COMMA_LEN ("cygwin_attach_dll") },
#endif
{ STRING_COMMA_LEN ("cygwin_premain0") },
{ STRING_COMMA_LEN ("cygwin_premain1") },
{ STRING_COMMA_LEN ("cygwin_premain2") },
{ STRING_COMMA_LEN ("cygwin_premain3") },
/* Runtime pseudo-reloc. */
{ STRING_COMMA_LEN ("_pei386_runtime_relocator") },
{ STRING_COMMA_LEN ("do_pseudo_reloc") },
/* Global vars that should not be exported. */
{ STRING_COMMA_LEN ("impure_ptr") },
{ STRING_COMMA_LEN ("_impure_ptr") },
{ STRING_COMMA_LEN ("_fmode") },
{ STRING_COMMA_LEN ("environ") },
{ NULL, 0 }
};
#define PE_ARCH_i386 1
#define PE_ARCH_sh 2
#define PE_ARCH_mips 3
#define PE_ARCH_arm 4
#define PE_ARCH_arm_epoc 5
#define PE_ARCH_arm_wince 6
/* Don't make it constant as underscore mode gets possibly overriden
by target or -(no-)leading-underscore option. */
static pe_details_type pe_detail_list[] =
{
{
#ifdef pe_use_x86_64
"pei-x86-64",
"pe-x86-64",
3 /* R_IMAGEBASE */,
#else
"pei-i386",
"pe-i386",
7 /* R_IMAGEBASE */,
#endif
PE_ARCH_i386,
bfd_arch_i386,
#ifdef pe_use_x86_64
FALSE,
#else
TRUE,
#endif
autofilter_symbollist_i386
},
{
"pei-shl",
"pe-shl",
16 /* R_SH_IMAGEBASE */,
PE_ARCH_sh,
bfd_arch_sh,
TRUE,
autofilter_symbollist_generic
},
{
"pei-mips",
"pe-mips",
34 /* MIPS_R_RVA */,
PE_ARCH_mips,
bfd_arch_mips,
FALSE,
autofilter_symbollist_generic
},
{
"pei-arm-little",
"pe-arm-little",
11 /* ARM_RVA32 */,
PE_ARCH_arm,
bfd_arch_arm,
TRUE,
autofilter_symbollist_generic
},
{
"epoc-pei-arm-little",
"epoc-pe-arm-little",
11 /* ARM_RVA32 */,
PE_ARCH_arm_epoc,
bfd_arch_arm,
FALSE,
autofilter_symbollist_generic
},
{
"pei-arm-wince-little",
"pe-arm-wince-little",
2, /* ARM_RVA32 on Windows CE, see bfd/coff-arm.c. */
PE_ARCH_arm_wince,
bfd_arch_arm,
FALSE,
autofilter_symbollist_generic
},
{ NULL, NULL, 0, 0, 0, FALSE, NULL }
};
static const pe_details_type *pe_details;
/* Do not specify library suffix explicitly, to allow for dllized versions. */
static const autofilter_entry_type autofilter_liblist[] =
{
{ STRING_COMMA_LEN ("libcegcc") },
{ STRING_COMMA_LEN ("libcygwin") },
{ STRING_COMMA_LEN ("libgcc") },
{ STRING_COMMA_LEN ("libgcc_s") },
{ STRING_COMMA_LEN ("libstdc++") },
{ STRING_COMMA_LEN ("libmingw32") },
{ STRING_COMMA_LEN ("libmingwex") },
{ STRING_COMMA_LEN ("libg2c") },
{ STRING_COMMA_LEN ("libsupc++") },
{ STRING_COMMA_LEN ("libobjc") },
{ STRING_COMMA_LEN ("libgcj") },
{ NULL, 0 }
};
/* Regardless of the suffix issue mentioned above, we must ensure that
we do not falsely match on a leading substring, such as when libtool
builds libstdc++ as a DLL using libsupc++convenience.a as an intermediate.
This routine ensures that the leading part of the name matches and that
it is followed by only an optional version suffix and a file extension,
returning zero if so or -1 if not. */
static int libnamencmp (const char *libname, const autofilter_entry_type *afptr)
{
if (filename_ncmp (libname, afptr->name, afptr->len))
return -1;
libname += afptr->len;
/* Be liberal in interpreting what counts as a version suffix; we
accept anything that has a dash to separate it from the name and
begins with a digit. */
if (libname[0] == '-')
{
if (!ISDIGIT (*++libname))
return -1;
/* Ensure the filename has an extension. */
while (*++libname != '.')
if (!*libname)
return -1;
}
else if (libname[0] != '.')
return -1;
return 0;
}
static const autofilter_entry_type autofilter_objlist[] =
{
{ STRING_COMMA_LEN ("crt0.o") },
{ STRING_COMMA_LEN ("crt1.o") },
{ STRING_COMMA_LEN ("crt2.o") },
{ STRING_COMMA_LEN ("dllcrt1.o") },
{ STRING_COMMA_LEN ("dllcrt2.o") },
{ STRING_COMMA_LEN ("gcrt0.o") },
{ STRING_COMMA_LEN ("gcrt1.o") },
{ STRING_COMMA_LEN ("gcrt2.o") },
{ STRING_COMMA_LEN ("crtbegin.o") },
{ STRING_COMMA_LEN ("crtend.o") },
{ NULL, 0 }
};
static const autofilter_entry_type autofilter_symbolprefixlist[] =
{
/* _imp_ is treated specially, as it is always underscored. */
/* { STRING_COMMA_LEN ("_imp_") }, */
/* Don't export some c++ symbols. */
{ STRING_COMMA_LEN ("__rtti_") },
{ STRING_COMMA_LEN ("__builtin_") },
/* Don't re-export auto-imported symbols. */
{ STRING_COMMA_LEN ("__nm_") },
/* Don't export symbols specifying internal DLL layout. */
{ STRING_COMMA_LEN ("_head_") },
{ STRING_COMMA_LEN ("_IMPORT_DESCRIPTOR_") },
/* Don't export section labels or artificial symbols
(eg ".weak.foo". */
{ STRING_COMMA_LEN (".") },
{ NULL, 0 }
};
static const autofilter_entry_type autofilter_symbolsuffixlist[] =
{
{ STRING_COMMA_LEN ("_iname") },
{ STRING_COMMA_LEN ("_NULL_THUNK_DATA") },
{ NULL, 0 }
};
#define U(str) (pe_details->underscored ? "_" str : str)
void
pe_dll_id_target (const char *target)
{
int i;
for (i = 0; pe_detail_list[i].target_name; i++)
if (strcmp (pe_detail_list[i].target_name, target) == 0
|| strcmp (pe_detail_list[i].object_target, target) == 0)
{
int u = pe_leading_underscore; /* Underscoring mode. -1 for use default. */
if (u == -1)
bfd_get_target_info (target, NULL, NULL, &u, NULL);
if (u == -1)
abort ();
pe_detail_list[i].underscored = (u != 0 ? TRUE : FALSE);
pe_details = pe_detail_list + i;
pe_leading_underscore = (u != 0 ? 1 : 0);
return;
}
einfo (_("%XUnsupported PEI architecture: %s\n"), target);
exit (1);
}
/* Helper functions for qsort. Relocs must be sorted so that we can write
them out by pages. */
typedef struct
{
bfd_vma vma;
char type;
short extra;
}
reloc_data_type;
static int
reloc_sort (const void *va, const void *vb)
{
bfd_vma a = ((const reloc_data_type *) va)->vma;
bfd_vma b = ((const reloc_data_type *) vb)->vma;
return (a > b) ? 1 : ((a < b) ? -1 : 0);
}
static int
pe_export_sort (const void *va, const void *vb)
{
const def_file_export *a = va;
const def_file_export *b = vb;
char *an = a->name;
char *bn = b->name;
if (a->its_name)
an = a->its_name;
if (b->its_name)
bn = b->its_name;
return strcmp (an, bn);
}
/* Read and process the .DEF file. */
/* These correspond to the entries in pe_def_file->exports[]. I use
exported_symbol_sections[i] to tag whether or not the symbol was
defined, since we can't export symbols we don't have. */
static bfd_vma *exported_symbol_offsets;
static struct bfd_section **exported_symbol_sections;
static int export_table_size;
static int count_exported;
static int count_exported_byname;
static int count_with_ordinals;
static const char *dll_name;
static int min_ordinal, max_ordinal;
static int *exported_symbols;
typedef struct exclude_list_struct
{
char *string;
struct exclude_list_struct *next;
exclude_type type;
}
exclude_list_struct;
static struct exclude_list_struct *excludes = 0;
void
pe_dll_add_excludes (const char *new_excludes, const exclude_type type)
{
char *local_copy;
char *exclude_string;
local_copy = xstrdup (new_excludes);
exclude_string = strtok (local_copy, ",:");
for (; exclude_string; exclude_string = strtok (NULL, ",:"))
{
struct exclude_list_struct *new_exclude;
new_exclude = xmalloc (sizeof (struct exclude_list_struct));
new_exclude->string = xmalloc (strlen (exclude_string) + 1);
strcpy (new_exclude->string, exclude_string);
new_exclude->type = type;
new_exclude->next = excludes;
excludes = new_exclude;
}
free (local_copy);
}
static bfd_boolean
is_import (const char* n)
{
return (CONST_STRNEQ (n, "__imp_"));
}
/* abfd is a bfd containing n (or NULL)
It can be used for contextual checks. */
static int
auto_export (bfd *abfd, def_file *d, const char *n)
{
def_file_export key;
struct exclude_list_struct *ex;
const autofilter_entry_type *afptr;
const char * libname = NULL;
if (abfd && abfd->my_archive)
libname = lbasename (abfd->my_archive->filename);
key.name = key.its_name = (char *) n;
/* Return false if n is in the d->exports table. */
if (bsearch (&key, d->exports, d->num_exports,
sizeof (pe_def_file->exports[0]), pe_export_sort))
return 0;
if (pe_dll_do_default_excludes)
{
const char * p;
int len;
if (pe_dll_extra_pe_debug)
printf ("considering exporting: %s, abfd=%p, abfd->my_arc=%p\n",
n, abfd, abfd->my_archive);
/* First of all, make context checks:
Don't export anything from standard libs. */
if (libname)
{
afptr = autofilter_liblist;
while (afptr->name)
{
if (libnamencmp (libname, afptr) == 0 )
return 0;
afptr++;
}
}
/* Next, exclude symbols from certain startup objects. */
if (abfd && (p = lbasename (abfd->filename)))
{
afptr = autofilter_objlist;
while (afptr->name)
{
if (strcmp (p, afptr->name) == 0)
return 0;
afptr++;
}
}
/* Don't try to blindly exclude all symbols
that begin with '__'; this was tried and
it is too restrictive. Instead we have
a target specific list to use: */
afptr = pe_details->autofilter_symbollist;
while (afptr->name)
{
if (strcmp (n, afptr->name) == 0)
return 0;
afptr++;
}
/* Next, exclude symbols starting with ... */
afptr = autofilter_symbolprefixlist;
while (afptr->name)
{
if (strncmp (n, afptr->name, afptr->len) == 0)
return 0;
afptr++;
}
/* Finally, exclude symbols ending with ... */
len = strlen (n);
afptr = autofilter_symbolsuffixlist;
while (afptr->name)
{
if ((len >= afptr->len)
/* Add 1 to insure match with trailing '\0'. */
&& strncmp (n + len - afptr->len, afptr->name,
afptr->len + 1) == 0)
return 0;
afptr++;
}
}
for (ex = excludes; ex; ex = ex->next)
{
if (ex->type == EXCLUDELIBS)
{
if (libname
&& ((filename_cmp (libname, ex->string) == 0)
|| (strcasecmp ("ALL", ex->string) == 0)))
return 0;
}
else if (ex->type == EXCLUDEFORIMPLIB)
{
if (filename_cmp (abfd->filename, ex->string) == 0)
return 0;
}
else if (strcmp (n, ex->string) == 0)
return 0;
}
return 1;
}
static void
process_def_file_and_drectve (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *info)
{
int i, j;
struct bfd_link_hash_entry *blhe;
bfd *b;
struct bfd_section *s;
def_file_export *e = 0;
bfd_boolean resort_needed;
if (!pe_def_file)
pe_def_file = def_file_empty ();
/* First, run around to all the objects looking for the .drectve
sections, and push those into the def file too. */
for (b = info->input_bfds; b; b = b->link_next)
{
s = bfd_get_section_by_name (b, ".drectve");
if (s)
{
long size = s->size;
char *buf = xmalloc (size);
bfd_get_section_contents (b, s, buf, 0, size);
def_file_add_directive (pe_def_file, buf, size);
free (buf);
}
}
/* Process aligned common symbol information from the
.drectve sections now; common symbol allocation is
done before final link, so it will be too late to
process them in process_embedded_commands() called
from _bfd_coff_link_input_bfd(). */
if (pe_def_file->aligncomms)
{
def_file_aligncomm *ac = pe_def_file->aligncomms;
while (ac)
{
struct coff_link_hash_entry *sym_hash;
sym_hash = coff_link_hash_lookup (coff_hash_table (info),
ac->symbol_name, FALSE, FALSE, FALSE);
if (sym_hash && sym_hash->root.type == bfd_link_hash_common
&& sym_hash->root.u.c.p->alignment_power < (unsigned) ac->alignment)
{
sym_hash->root.u.c.p->alignment_power = (unsigned) ac->alignment;
}
ac = ac->next;
}
}
/* If we are building an executable and there is nothing
to export, we do not build an export table at all. */
if (info->executable && pe_def_file->num_exports == 0
&& (!pe_dll_export_everything || pe_dll_exclude_all_symbols))
return;
/* Now, maybe export everything else the default way. */
if ((pe_dll_export_everything || pe_def_file->num_exports == 0)
&& !pe_dll_exclude_all_symbols)
{
for (b = info->input_bfds; b; b = b->link_next)
{
asymbol **symbols;
int nsyms;
if (!bfd_generic_link_read_symbols (b))
{
einfo (_("%B%F: could not read symbols: %E\n"), b);
return;
}
symbols = bfd_get_outsymbols (b);
nsyms = bfd_get_symcount (b);
for (j = 0; j < nsyms; j++)
{
/* We should export symbols which are either global or not
anything at all. (.bss data is the latter)
We should not export undefined symbols. */
bfd_boolean would_export
= (symbols[j]->section != bfd_und_section_ptr
&& ((symbols[j]->flags & BSF_GLOBAL)
|| (symbols[j]->flags == 0)));
if (link_info.version_info && would_export)
would_export
= !bfd_hide_sym_by_version (link_info.version_info,
symbols[j]->name);
if (would_export)
{
const char *sn = symbols[j]->name;
/* We should not re-export imported stuff. */
{
char *name;
if (is_import (sn))
continue;
name = xmalloc (strlen ("__imp_") + strlen (sn) + 1);
sprintf (name, "%s%s", "__imp_", sn);
blhe = bfd_link_hash_lookup (info->hash, name,
FALSE, FALSE, FALSE);
free (name);
if (blhe && blhe->type == bfd_link_hash_defined)
continue;
}
if (pe_details->underscored && *sn == '_')
sn++;
if (auto_export (b, pe_def_file, sn))
{
int is_dup = 0;
def_file_export *p;
p = def_file_add_export (pe_def_file, sn, 0, -1,
NULL, &is_dup);
/* Fill data flag properly, from dlltool.c. */
if (!is_dup)
p->flag_data = !(symbols[j]->flags & BSF_FUNCTION);
}
}
}
}
}
#undef NE
#define NE pe_def_file->num_exports
/* Don't create an empty export table. */
if (NE == 0)
return;
resort_needed = FALSE;
/* Canonicalize the export list. */
if (pe_dll_kill_ats)
{
for (i = 0; i < NE; i++)
{
if (strchr (pe_def_file->exports[i].name, '@'))
{
/* This will preserve internal_name, which may have been
pointing to the same memory as name, or might not
have. */
int lead_at = (*pe_def_file->exports[i].name == '@');
char *tmp = xstrdup (pe_def_file->exports[i].name + lead_at);
char *tmp_at = strchr (tmp, '@');
if (tmp_at)
*tmp_at = 0;
else
einfo (_("%XCannot export %s: invalid export name\n"),
pe_def_file->exports[i].name);
pe_def_file->exports[i].name = tmp;
resort_needed = TRUE;
}
}
}
/* Re-sort the exports table as we have possibly changed the order
by removing leading @. */
if (resort_needed)
qsort (pe_def_file->exports, NE, sizeof (pe_def_file->exports[0]),
pe_export_sort);
if (pe_dll_stdcall_aliases)
{
for (i = 0; i < NE; i++)
{
if (is_import (pe_def_file->exports[i].name))
continue;
if (strchr (pe_def_file->exports[i].name, '@'))
{
int is_dup = 1;
int lead_at = (*pe_def_file->exports[i].name == '@');
char *tmp = xstrdup (pe_def_file->exports[i].name + lead_at);
*(strchr (tmp, '@')) = 0;
if (auto_export (NULL, pe_def_file, tmp))
def_file_add_export (pe_def_file, tmp,
pe_def_file->exports[i].internal_name,
-1, NULL, &is_dup);
if (is_dup)
free (tmp);
}
}
}
/* Convenience, but watch out for it changing. */
e = pe_def_file->exports;
for (i = 0, j = 0; i < NE; i++)
{
if (i > 0 && strcmp (e[i].name, e[i - 1].name) == 0)
{
/* This is a duplicate. */
if (e[j - 1].ordinal != -1
&& e[i].ordinal != -1
&& e[j - 1].ordinal != e[i].ordinal)
{
if (pe_dll_warn_dup_exports)
/* xgettext:c-format */
einfo (_("%XError, duplicate EXPORT with ordinals: %s (%d vs %d)\n"),
e[j - 1].name, e[j - 1].ordinal, e[i].ordinal);
}
else
{
if (pe_dll_warn_dup_exports)
/* xgettext:c-format */
einfo (_("Warning, duplicate EXPORT: %s\n"),
e[j - 1].name);
}
if (e[i].ordinal != -1)
e[j - 1].ordinal = e[i].ordinal;
e[j - 1].flag_private |= e[i].flag_private;
e[j - 1].flag_constant |= e[i].flag_constant;
e[j - 1].flag_noname |= e[i].flag_noname;
e[j - 1].flag_data |= e[i].flag_data;
if (e[i].name)
free (e[i].name);
if (e[i].internal_name)
free (e[i].internal_name);
if (e[i].its_name)
free (e[i].its_name);
}
else
{
if (i != j)
e[j] = e[i];
j++;
}
}
pe_def_file->num_exports = j; /* == NE */
exported_symbol_offsets = xmalloc (NE * sizeof (bfd_vma));
exported_symbol_sections = xmalloc (NE * sizeof (struct bfd_section *));
memset (exported_symbol_sections, 0, NE * sizeof (struct bfd_section *));
max_ordinal = 0;
min_ordinal = 65536;
count_exported = 0;
count_exported_byname = 0;
count_with_ordinals = 0;
for (i = 0; i < NE; i++)
{
char *name;
name = xmalloc (strlen (pe_def_file->exports[i].internal_name) + 2);
if (pe_details->underscored
&& (*pe_def_file->exports[i].internal_name != '@'))
{
*name = '_';
strcpy (name + 1, pe_def_file->exports[i].internal_name);
}
else
strcpy (name, pe_def_file->exports[i].internal_name);
blhe = bfd_link_hash_lookup (info->hash,
name,
FALSE, FALSE, TRUE);
if (blhe
&& (blhe->type == bfd_link_hash_defined
|| (blhe->type == bfd_link_hash_common)))
{
count_exported++;
if (!pe_def_file->exports[i].flag_noname)
count_exported_byname++;
/* Only fill in the sections. The actual offsets are computed
in fill_exported_offsets() after common symbols are laid
out. */
if (blhe->type == bfd_link_hash_defined)
exported_symbol_sections[i] = blhe->u.def.section;
else
exported_symbol_sections[i] = blhe->u.c.p->section;
if (pe_def_file->exports[i].ordinal != -1)
{
if (max_ordinal < pe_def_file->exports[i].ordinal)
max_ordinal = pe_def_file->exports[i].ordinal;
if (min_ordinal > pe_def_file->exports[i].ordinal)
min_ordinal = pe_def_file->exports[i].ordinal;
count_with_ordinals++;
}
}
/* Check for forward exports. These are indicated in DEF files by an
export directive of the form NAME1 = MODULE-NAME.EXTERNAL-NAME
but we must take care not to be fooled when the user wants to export
a symbol that actually really has a dot in it, so we only check
for them here, after real defined symbols have already been matched. */
else if (strchr (pe_def_file->exports[i].internal_name, '.'))
{
count_exported++;
if (!pe_def_file->exports[i].flag_noname)
count_exported_byname++;
pe_def_file->exports[i].flag_forward = 1;
if (pe_def_file->exports[i].ordinal != -1)
{
if (max_ordinal < pe_def_file->exports[i].ordinal)
max_ordinal = pe_def_file->exports[i].ordinal;
if (min_ordinal > pe_def_file->exports[i].ordinal)
min_ordinal = pe_def_file->exports[i].ordinal;
count_with_ordinals++;
}
}
else if (blhe && blhe->type == bfd_link_hash_undefined)
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol not defined\n"),
pe_def_file->exports[i].internal_name);
}
else if (blhe)
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol wrong type (%d vs %d)\n"),
pe_def_file->exports[i].internal_name,
blhe->type, bfd_link_hash_defined);
}
else
{
/* xgettext:c-format */
einfo (_("%XCannot export %s: symbol not found\n"),
pe_def_file->exports[i].internal_name);
}
free (name);
}
}
/* Build the bfd that will contain .edata and .reloc sections. */
static void
build_filler_bfd (int include_edata)
{
lang_input_statement_type *filler_file;
filler_file = lang_add_input_file ("dll stuff",
lang_input_file_is_fake_enum,
NULL);
filler_file->the_bfd = filler_bfd = bfd_create ("dll stuff",
link_info.output_bfd);
if (filler_bfd == NULL
|| !bfd_set_arch_mach (filler_bfd,
bfd_get_arch (link_info.output_bfd),
bfd_get_mach (link_info.output_bfd)))
{
einfo ("%X%P: can not create BFD: %E\n");
return;
}
if (include_edata)
{